Remove invalid SHA-256-Digests

[simantics/platform.git] / bundles / org.eclipse.swt.win32.win32.x86_64 / src / org / eclipse / swt / widgets / Shell.java

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.widgets;


import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.win32.*;

/**
 * Instances of this class represent the "windows"
 * which the desktop or "window manager" is managing.
 * Instances that do not have a parent (that is, they
 * are built using the constructor, which takes a
 * <code>Display</code> as the argument) are described
 * as <em>top level</em> shells. Instances that do have
 * a parent are described as <em>secondary</em> or
 * <em>dialog</em> shells.
 * <p>
 * Instances are always displayed in one of the maximized,
 * minimized or normal states:</p>
 * <ul>
 * <li>
 * When an instance is marked as <em>maximized</em>, the
 * window manager will typically resize it to fill the
 * entire visible area of the display, and the instance
 * is usually put in a state where it can not be resized
 * (even if it has style <code>RESIZE</code>) until it is
 * no longer maximized.
 * </li><li>
 * When an instance is in the <em>normal</em> state (neither
 * maximized or minimized), its appearance is controlled by
 * the style constants which were specified when it was created
 * and the restrictions of the window manager (see below).
 * </li><li>
 * When an instance has been marked as <em>minimized</em>,
 * its contents (client area) will usually not be visible,
 * and depending on the window manager, it may be
 * "iconified" (that is, replaced on the desktop by a small
 * simplified representation of itself), relocated to a
 * distinguished area of the screen, or hidden. Combinations
 * of these changes are also possible.
 * </li>
 * </ul>
 * <p>
 * The <em>modality</em> of an instance may be specified using
 * style bits. The modality style bits are used to determine
 * whether input is blocked for other shells on the display.
 * The <code>PRIMARY_MODAL</code> style allows an instance to block
 * input to its parent. The <code>APPLICATION_MODAL</code> style
 * allows an instance to block input to every other shell in the
 * display. The <code>SYSTEM_MODAL</code> style allows an instance
 * to block input to all shells, including shells belonging to
 * different applications.
 * </p><p>
 * Note: The styles supported by this class are treated
 * as <em>HINT</em>s, since the window manager for the
 * desktop on which the instance is visible has ultimate
 * control over the appearance and behavior of decorations
 * and modality. For example, some window managers only
 * support resizable windows and will always assume the
 * RESIZE style, even if it is not set. In addition, if a
 * modality style is not supported, it is "upgraded" to a
 * more restrictive modality style that is supported. For
 * example, if <code>PRIMARY_MODAL</code> is not supported,
 * it would be upgraded to <code>APPLICATION_MODAL</code>.
 * A modality style may also be "downgraded" to a less
 * restrictive style. For example, most operating systems
 * no longer support <code>SYSTEM_MODAL</code> because
 * it can freeze up the desktop, so this is typically
 * downgraded to <code>APPLICATION_MODAL</code>.</p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>BORDER, CLOSE, MIN, MAX, NO_MOVE, NO_TRIM, RESIZE, TITLE, ON_TOP, TOOL, SHEET</dd>
 * <dd>APPLICATION_MODAL, MODELESS, PRIMARY_MODAL, SYSTEM_MODAL</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Activate, Close, Deactivate, Deiconify, Iconify</dd>
 * </dl>
 * <p>
 * Class <code>SWT</code> provides two "convenience constants"
 * for the most commonly required style combinations:</p>
 * <dl>
 * <dt><code>SHELL_TRIM</code></dt>
 * <dd>
 * the result of combining the constants which are required
 * to produce a typical application top level shell: (that
 * is, <code>CLOSE | TITLE | MIN | MAX | RESIZE</code>)
 * </dd>
 * <dt><code>DIALOG_TRIM</code></dt>
 * <dd>
 * the result of combining the constants which are required
 * to produce a typical application dialog shell: (that
 * is, <code>TITLE | CLOSE | BORDER</code>)
 * </dd>
 * </dl>
 * <p>
 * Note: Only one of the styles APPLICATION_MODAL, MODELESS,
 * PRIMARY_MODAL and SYSTEM_MODAL may be specified.
 * </p><p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 *
 * @see Decorations
 * @see SWT
 * @see <a href="http://www.eclipse.org/swt/snippets/#shell">Shell snippets</a>
 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 * @noextend This class is not intended to be subclassed by clients.
 */
public class Shell extends Decorations {
        Menu activeMenu;
        ToolTip [] toolTips;
        long hIMC, hwndMDIClient, lpstrTip, toolTipHandle, balloonTipHandle, menuItemToolTipHandle;
        int minWidth = SWT.DEFAULT, minHeight = SWT.DEFAULT;
        long [] brushes;
        boolean showWithParent, fullScreen, wasMaximized, modified, center;
        String toolTitle, balloonTitle;
        long toolIcon, balloonIcon;
        long windowProc;
        Control lastActive;
        static /*final*/ long ToolTipProc;
        static final long DialogProc;
        static final TCHAR DialogClass = new TCHAR (0, "#32770", true);
        final static int [] SYSTEM_COLORS = {
                OS.COLOR_BTNFACE,
                OS.COLOR_WINDOW,
                OS.COLOR_BTNTEXT,
                OS.COLOR_WINDOWTEXT,
                OS.COLOR_HIGHLIGHT,
                OS.COLOR_SCROLLBAR,
        };
        final static int BRUSHES_SIZE = 32;
        static {
                WNDCLASS lpWndClass = new WNDCLASS ();
                OS.GetClassInfo (0, DialogClass, lpWndClass);
                DialogProc = lpWndClass.lpfnWndProc;
        }

/**
 * Constructs a new instance of this class. This is equivalent
 * to calling <code>Shell((Display) null)</code>.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 */
public Shell () {
        this ((Display) null);
}

/**
 * Constructs a new instance of this class given only the style
 * value describing its behavior and appearance. This is equivalent
 * to calling <code>Shell((Display) null, style)</code>.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p>
 *
 * @param style the style of control to construct
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT#BORDER
 * @see SWT#CLOSE
 * @see SWT#MIN
 * @see SWT#MAX
 * @see SWT#RESIZE
 * @see SWT#TITLE
 * @see SWT#TOOL
 * @see SWT#NO_TRIM
 * @see SWT#NO_MOVE
 * @see SWT#SHELL_TRIM
 * @see SWT#DIALOG_TRIM
 * @see SWT#ON_TOP
 * @see SWT#MODELESS
 * @see SWT#PRIMARY_MODAL
 * @see SWT#APPLICATION_MODAL
 * @see SWT#SYSTEM_MODAL
 * @see SWT#SHEET
 */
public Shell (int style) {
        this ((Display) null, style);
}

/**
 * Constructs a new instance of this class given only the display
 * to create it on. It is created with style <code>SWT.SHELL_TRIM</code>.
 * <p>
 * Note: Currently, null can be passed in for the display argument.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the display argument is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param display the display to create the shell on
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 */
public Shell (Display display) {
        this (display, SWT.SHELL_TRIM);
}

/**
 * Constructs a new instance of this class given the display
 * to create it on and a style value describing its behavior
 * and appearance.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p><p>
 * Note: Currently, null can be passed in for the display argument.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the display argument is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param display the display to create the shell on
 * @param style the style of control to construct
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT#BORDER
 * @see SWT#CLOSE
 * @see SWT#MIN
 * @see SWT#MAX
 * @see SWT#RESIZE
 * @see SWT#TITLE
 * @see SWT#TOOL
 * @see SWT#NO_TRIM
 * @see SWT#NO_MOVE
 * @see SWT#SHELL_TRIM
 * @see SWT#DIALOG_TRIM
 * @see SWT#ON_TOP
 * @see SWT#MODELESS
 * @see SWT#PRIMARY_MODAL
 * @see SWT#APPLICATION_MODAL
 * @see SWT#SYSTEM_MODAL
 * @see SWT#SHEET
 */
public Shell (Display display, int style) {
        this (display, null, style, 0, false);
}

Shell (Display display, Shell parent, int style, long handle, boolean embedded) {
        super ();
        checkSubclass ();
        if (display == null) display = Display.getCurrent ();
        if (display == null) display = Display.getDefault ();
        if (!display.isValidThread ()) {
                error (SWT.ERROR_THREAD_INVALID_ACCESS);
        }
        if (parent != null && parent.isDisposed ()) {
                error (SWT.ERROR_INVALID_ARGUMENT);
        }
        this.center = parent != null && (style & SWT.SHEET) != 0;
        this.style = checkStyle (parent, style);
        this.parent = parent;
        this.display = display;
        this.handle = handle;
        if (handle != 0 && !embedded) {
                state |= FOREIGN_HANDLE;
        }
        reskinWidget();
        createWidget ();
}

/**
 * Constructs a new instance of this class given only its
 * parent. It is created with style <code>SWT.DIALOG_TRIM</code>.
 * <p>
 * Note: Currently, null can be passed in for the parent.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the parent is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param parent a shell which will be the parent of the new instance
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 */
public Shell (Shell parent) {
        this (parent, SWT.DIALOG_TRIM);
}

/**
 * Constructs a new instance of this class given its parent
 * and a style value describing its behavior and appearance.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>SWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>SWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p><p>
 * Note: Currently, null can be passed in for the parent.
 * This has the effect of creating the shell on the currently active
 * display if there is one. If there is no current display, the
 * shell is created on a "default" display. <b>Passing in null as
 * the parent is not considered to be good coding style,
 * and may not be supported in a future release of SWT.</b>
 * </p>
 *
 * @param parent a shell which will be the parent of the new instance
 * @param style the style of control to construct
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see SWT#BORDER
 * @see SWT#CLOSE
 * @see SWT#MIN
 * @see SWT#MAX
 * @see SWT#RESIZE
 * @see SWT#TITLE
 * @see SWT#NO_TRIM
 * @see SWT#NO_MOVE
 * @see SWT#SHELL_TRIM
 * @see SWT#DIALOG_TRIM
 * @see SWT#ON_TOP
 * @see SWT#TOOL
 * @see SWT#MODELESS
 * @see SWT#PRIMARY_MODAL
 * @see SWT#APPLICATION_MODAL
 * @see SWT#SYSTEM_MODAL
 * @see SWT#SHEET
 */
public Shell (Shell parent, int style) {
        this (parent != null ? parent.display : null, parent, style, 0, false);
}

/**
 * Invokes platform specific functionality to allocate a new shell
 * that is embedded.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Shell</code>. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * </p>
 *
 * @param display the display for the shell
 * @param handle the handle for the shell
 * @return a new shell object containing the specified display and handle
 *
 * @noreference This method is not intended to be referenced by clients.
 */
public static Shell win32_new (Display display, long handle) {
        return new Shell (display, null, SWT.NO_TRIM, handle, true);
}

/**
 * Invokes platform specific functionality to allocate a new shell
 * that is not embedded.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Shell</code>. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * </p>
 *
 * @param display the display for the shell
 * @param handle the handle for the shell
 * @return a new shell object containing the specified display and handle
 *
 * @noreference This method is not intended to be referenced by clients.
 *
 * @since 3.3
 */
public static Shell internal_new (Display display, long handle) {
        return new Shell (display, null, SWT.NO_TRIM, handle, false);
}

static int checkStyle (Shell parent, int style) {
        style = Decorations.checkStyle (style);
        style &= ~SWT.TRANSPARENT;
        int mask = SWT.SYSTEM_MODAL | SWT.APPLICATION_MODAL | SWT.PRIMARY_MODAL;
        if ((style & SWT.SHEET) != 0) {
                style &= ~SWT.SHEET;
                style |= parent == null ? SWT.SHELL_TRIM : SWT.DIALOG_TRIM;
                if ((style & mask) == 0) {
                        style |= parent == null ? SWT.APPLICATION_MODAL : SWT.PRIMARY_MODAL;
                }
        }
        int bits = style & ~mask;
        if ((style & SWT.SYSTEM_MODAL) != 0) return bits | SWT.SYSTEM_MODAL;
        if ((style & SWT.APPLICATION_MODAL) != 0) return bits | SWT.APPLICATION_MODAL;
        if ((style & SWT.PRIMARY_MODAL) != 0) return bits | SWT.PRIMARY_MODAL;
        return bits;
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when operations are performed on the receiver,
 * by sending the listener one of the messages defined in the
 * <code>ShellListener</code> interface.
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see ShellListener
 * @see #removeShellListener
 */
public void addShellListener (ShellListener listener) {
        checkWidget ();
        if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
        TypedListener typedListener = new TypedListener (listener);
        addListener (SWT.Close,typedListener);
        addListener (SWT.Iconify,typedListener);
        addListener (SWT.Deiconify,typedListener);
        addListener (SWT.Activate, typedListener);
        addListener (SWT.Deactivate, typedListener);
}

long balloonTipHandle () {
        if (balloonTipHandle == 0) createBalloonTipHandle ();
        return balloonTipHandle;
}

@Override
long callWindowProc (long hwnd, int msg, long wParam, long lParam) {
        if (handle == 0) return 0;
        if (hwnd == toolTipHandle || hwnd == balloonTipHandle || hwnd == menuItemToolTipHandle) {
                return OS.CallWindowProc (ToolTipProc, hwnd, msg, wParam, lParam);
        }
        if (hwndMDIClient != 0) {
                return OS.DefFrameProc (hwnd, hwndMDIClient, msg, wParam, lParam);
        }
        if (windowProc != 0) {
                return OS.CallWindowProc (windowProc, hwnd, msg, wParam, lParam);
        }
        if ((style & SWT.TOOL) != 0) {
                int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX | SWT.BORDER | SWT.RESIZE;
                if ((style & trim) == 0) return OS.DefWindowProc (hwnd, msg, wParam, lParam);
        }
        if ((style & SWT.NO_MOVE) != 0) {
                setItemEnabled (OS.SC_MOVE, false);
        }
        if (parent != null) {
                switch (msg) {
                        case OS.WM_KILLFOCUS:
                        case OS.WM_SETFOCUS:
                                return OS.DefWindowProc (hwnd, msg, wParam, lParam);
                }
                return OS.CallWindowProc (DialogProc, hwnd, msg, wParam, lParam);
        }
        return OS.DefWindowProc (hwnd, msg, wParam, lParam);
}

void center () {
        if (parent == null) return;
        Rectangle rect = getBoundsInPixels ();
        Rectangle parentRect = display.mapInPixels (parent, null, parent.getClientAreaInPixels());
        int x = Math.max (parentRect.x, parentRect.x + (parentRect.width - rect.width) / 2);
        int y = Math.max (parentRect.y, parentRect.y + (parentRect.height - rect.height) / 2);
        Rectangle monitorRect = parent.getMonitor ().getClientArea();
        if (x + rect.width > monitorRect.x + monitorRect.width) {
                x = Math.max (monitorRect.x, monitorRect.x + monitorRect.width - rect.width);
        } else {
                x = Math.max (x, monitorRect.x);
        }
        if (y + rect.height > monitorRect.y + monitorRect.height) {
                y = Math.max (monitorRect.y, monitorRect.y + monitorRect.height - rect.height);
        } else {
                y = Math.max (y, monitorRect.y);
        }
        setLocationInPixels (x, y);
}

/**
 * Requests that the window manager close the receiver in
 * the same way it would be closed when the user clicks on
 * the "close box" or performs some other platform specific
 * key or mouse combination that indicates the window
 * should be removed.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SWT#Close
 * @see #dispose
 */
public void close () {
        checkWidget ();
        closeWidget ();
}

void createBalloonTipHandle () {
        balloonTipHandle = OS.CreateWindowEx (
                0,
                new TCHAR (0, OS.TOOLTIPS_CLASS, true),
                null,
                OS.TTS_ALWAYSTIP | OS.TTS_NOPREFIX | OS.TTS_BALLOON,
                OS.CW_USEDEFAULT, 0, OS.CW_USEDEFAULT, 0,
                handle,
                0,
                OS.GetModuleHandle (null),
                null);
        if (balloonTipHandle == 0) error (SWT.ERROR_NO_HANDLES);
        if (ToolTipProc == 0) {
                ToolTipProc = OS.GetWindowLongPtr (balloonTipHandle, OS.GWLP_WNDPROC);
        }
        /*
        * Feature in Windows.  Despite the fact that the
        * tool tip text contains \r\n, the tooltip will
        * not honour the new line unless TTM_SETMAXTIPWIDTH
        * is set.  The fix is to set TTM_SETMAXTIPWIDTH to
        * a large value.
        */
        OS.SendMessage (balloonTipHandle, OS.TTM_SETMAXTIPWIDTH, 0, 0x7FFF);
        display.addControl (balloonTipHandle, this);
        OS.SetWindowLongPtr (balloonTipHandle, OS.GWLP_WNDPROC, display.windowProc);
}

@Override
void createHandle () {
        boolean embedded = handle != 0 && (state & FOREIGN_HANDLE) == 0;

        /*
        * On Windows 98 and NT, setting a window to be the
        * top most window using HWND_TOPMOST can result in a
        * parent dialog shell being moved behind its parent
        * if the dialog has a sibling that is currently on top
        * This only occurs using SetWindowPos (), not when the
        * handle is created.
        */
        /*
        * The following code is intentionally commented.
        */
//      if ((style & SWT.ON_TOP) != 0) display.lockActiveWindow = true;
        if (handle == 0 || embedded) {
                super.createHandle ();
        } else {
                state |= CANVAS;
                if ((style & (SWT.H_SCROLL | SWT.V_SCROLL)) == 0) {
                        state |= THEME_BACKGROUND;
                }
                windowProc = OS.GetWindowLongPtr (handle, OS.GWL_WNDPROC);
        }

        /*
        * The following code is intentionally commented.
        */
//      if ((style & SWT.ON_TOP) != 0)  display.lockActiveWindow = false;

        if (!embedded) {
                int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
                bits &= ~(OS.WS_OVERLAPPED | OS.WS_CAPTION);
                bits |= OS.WS_POPUP;
                if ((style & SWT.TITLE) != 0) bits |= OS.WS_CAPTION;
                if ((style & SWT.NO_TRIM) == 0) {
                        if ((style & (SWT.BORDER | SWT.RESIZE)) == 0) bits |= OS.WS_BORDER;
                }
                /*
                * Bug in Windows.  When the WS_CAPTION bits are cleared using
                * SetWindowLong(), Windows does not resize the client area of
                * the window to get rid of the caption until the first resize.
                * The fix is to use SetWindowPos() with SWP_DRAWFRAME to force
                * the frame to be redrawn and resized.
                */
                OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
                int flags = OS.SWP_DRAWFRAME | OS.SWP_NOMOVE | OS.SWP_NOSIZE | OS.SWP_NOZORDER | OS.SWP_NOACTIVATE;
                OS.SetWindowPos (handle, 0, 0, 0, 0, 0, flags);
        }
        if (OS.IsDBLocale) {
                hIMC = OS.ImmCreateContext ();
                if (hIMC != 0) OS.ImmAssociateContext (handle, hIMC);
        }
}

void createMenuItemToolTipHandle() {
        menuItemToolTipHandle = createToolTipHandle (0);
}

void createToolTip (ToolTip toolTip) {
        int id = 0;
        if (toolTips == null) toolTips = new ToolTip [4];
        while (id < toolTips.length && toolTips [id] != null) id++;
        if (id == toolTips.length) {
                ToolTip [] newToolTips = new ToolTip [toolTips.length + 4];
                System.arraycopy (toolTips, 0, newToolTips, 0, toolTips.length);
                toolTips = newToolTips;
        }
        toolTips [id] = toolTip;
        toolTip.id = id + Display.ID_START;
        TOOLINFO lpti = new TOOLINFO ();
        lpti.cbSize = TOOLINFO.sizeof;
        lpti.hwnd = handle;
        lpti.uId = toolTip.id;
        lpti.uFlags = OS.TTF_TRACK;
        lpti.lpszText = OS.LPSTR_TEXTCALLBACK;
        OS.SendMessage (toolTip.hwndToolTip (), OS.TTM_ADDTOOL, 0, lpti);
}

void createToolTipHandle () {
        toolTipHandle = createToolTipHandle (handle);
}

long createToolTipHandle (long parent) {
        long toolTipHandle = OS.CreateWindowEx (
                0,
                new TCHAR (0, OS.TOOLTIPS_CLASS, true),
                null,
                OS.TTS_ALWAYSTIP | OS.TTS_NOPREFIX,
                OS.CW_USEDEFAULT, 0, OS.CW_USEDEFAULT, 0,
                parent,
                0,
                OS.GetModuleHandle (null),
                null);
        if (toolTipHandle == 0) error (SWT.ERROR_NO_HANDLES);
        if (ToolTipProc == 0) {
                ToolTipProc = OS.GetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC);
        }
        /*
        * Feature in Windows.  Despite the fact that the
        * tool tip text contains \r\n, the tooltip will
        * not honour the new line unless TTM_SETMAXTIPWIDTH
        * is set.  The fix is to set TTM_SETMAXTIPWIDTH to
        * a large value.
        */
        OS.SendMessage (toolTipHandle, OS.TTM_SETMAXTIPWIDTH, 0, 0x7FFF);
        display.addControl (toolTipHandle, this);
        OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, display.windowProc);
        return toolTipHandle;
}

@Override
void deregister () {
        super.deregister ();
        if (toolTipHandle != 0) display.removeControl (toolTipHandle);
        if (balloonTipHandle != 0) display.removeControl (balloonTipHandle);
        if (menuItemToolTipHandle != 0) display.removeControl (menuItemToolTipHandle);
}

void destroyToolTip (ToolTip toolTip) {
        if (toolTips == null) return;
        toolTips [toolTip.id - Display.ID_START] = null;
        if (balloonTipHandle != 0) {
                TOOLINFO lpti = new TOOLINFO ();
                lpti.cbSize = TOOLINFO.sizeof;
                lpti.uId = toolTip.id;
                lpti.hwnd = handle;
                OS.SendMessage (balloonTipHandle, OS.TTM_DELTOOL, 0, lpti);
        }
        toolTip.id = -1;
}

@Override
void destroyWidget () {
        fixActiveShell ();
        super.destroyWidget ();

        /*
        * Destroy context only after the controls that used it were destroyed.
        * Technically, that shouldn't be necessary, because 'Control.releaseWidget'
        * clears up association by calling 'OS.ImmAssociateContext (handle, 0)'.
        * However, there's a bug in Windows 10 (see bug 526758), and this is the workaround.
        */
        if (OS.IsDBLocale) {
                if (hIMC != 0) OS.ImmDestroyContext (hIMC);
        }
}

@Override
public void dispose () {
        /*
        * This code is intentionally commented.  On some
        * platforms, the owner window is repainted right
        * away when a dialog window exits.  This behavior
        * is currently unspecified.
        */
//      /*
//      * Note:  It is valid to attempt to dispose a widget
//      * more than once.  If this happens, fail silently.
//      */
//      if (!isValidWidget ()) return;
//      if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
//      Display oldDisplay = display;
        super.dispose ();
        // widget is disposed at this point
//      if (oldDisplay != null) oldDisplay.update ();
}

@Override
void enableWidget (boolean enabled) {
        if (enabled) {
                state &= ~DISABLED;
        } else {
                state |= DISABLED;
        }
        if (Display.TrimEnabled) {
                if (isActive ()) setItemEnabled (OS.SC_CLOSE, enabled);
        } else {
                OS.EnableWindow (handle, enabled);
        }
}

@Override
long findBrush (long value, int lbStyle) {
        if (lbStyle == OS.BS_SOLID) {
                for (int i=0; i<SYSTEM_COLORS.length; i++) {
                        if (value == OS.GetSysColor (SYSTEM_COLORS [i])) {
                                return OS.GetSysColorBrush (SYSTEM_COLORS [i]);
                        }
                }
        }
        if (brushes == null) brushes = new long [BRUSHES_SIZE];
        LOGBRUSH logBrush = new LOGBRUSH ();
        for (int i=0; i<brushes.length; i++) {
                long hBrush = brushes [i];
                if (hBrush == 0) break;
                OS.GetObject (hBrush, LOGBRUSH.sizeof, logBrush);
                switch (logBrush.lbStyle) {
                        case OS.BS_SOLID:
                                if (lbStyle == OS.BS_SOLID) {
                                        if (logBrush.lbColor == value) return hBrush;
                                }
                                break;
                        case OS.BS_PATTERN:
                                if (lbStyle == OS.BS_PATTERN) {
                                        if (logBrush.lbHatch == value) return hBrush;
                                }
                                break;
                }
        }
        int length = brushes.length;
        long hBrush = brushes [--length];
        if (hBrush != 0) OS.DeleteObject (hBrush);
        System.arraycopy (brushes, 0, brushes, 1, length);
        switch (lbStyle) {
                case OS.BS_SOLID:
                        hBrush = OS.CreateSolidBrush ((int)value);
                        break;
                case OS.BS_PATTERN:
                        hBrush = OS.CreatePatternBrush (value);
                        break;
        }
        return brushes [0] = hBrush;
}

@Override
Control findBackgroundControl () {
        return background != -1 || backgroundImage != null ? this : null;
}

@Override
Cursor findCursor () {
        return cursor;
}

@Override
Control findThemeControl () {
        return null;
}

ToolTip findToolTip (int id) {
        if (toolTips == null) return null;
        id = id - Display.ID_START;
        return 0 <= id && id < toolTips.length ? toolTips [id] : null;
}

void fixActiveShell () {
        /*
        * Feature in Windows.  When the active shell is disposed
        * or hidden, Windows normally makes the parent shell active
        * and assigns focus.  This does not happen when the parent
        * shell is disabled.  Instead, Windows assigns focus to the
        * next shell on the desktop (possibly a shell in another
        * application).  The fix is to activate the disabled parent
        * shell before disposing or hiding the active shell.
        */
        long hwndParent = OS.GetParent (handle);
        if (hwndParent != 0 && handle == OS.GetActiveWindow ()) {
                if (!OS.IsWindowEnabled (hwndParent) && OS.IsWindowVisible (hwndParent)) {
                        OS.SetActiveWindow (hwndParent);
                }
        }
}

void fixShell (Shell newShell, Control control) {
        if (this == newShell) return;
        if (control == lastActive) setActiveControl (null);
        String toolTipText = control.toolTipText;
        if (toolTipText != null) {
                control.setToolTipText (this, null);
                control.setToolTipText (newShell, toolTipText);
        }
}

void fixToolTip () {
        /*
        * Bug in Windows.  On XP, when a tooltip is
        * hidden due to a time out or mouse press,
        * the tooltip remains active although no
        * longer visible and won't show again until
        * another tooltip becomes active.  If there
        * is only one tooltip in the window,  it will
        * never show again.  The fix is to remove the
        * current tooltip and add it again every time
        * the mouse leaves the control.
        */
        if (toolTipHandle == 0) return;
        TOOLINFO lpti = new TOOLINFO ();
        lpti.cbSize = TOOLINFO.sizeof;
        if (OS.SendMessage (toolTipHandle, OS.TTM_GETCURRENTTOOL, 0, lpti) != 0) {
                if ((lpti.uFlags & OS.TTF_IDISHWND) != 0) {
                        OS.SendMessage (toolTipHandle, OS.TTM_DELTOOL, 0, lpti);
                        OS.SendMessage (toolTipHandle, OS.TTM_ADDTOOL, 0, lpti);
                }
        }
        TOOLINFO lptiMt = new TOOLINFO ();
        lptiMt.cbSize = TOOLINFO.sizeof;
        if (OS.SendMessage (menuItemToolTipHandle, OS.TTM_GETCURRENTTOOL, 0, lptiMt) != 0) {
                if ((lptiMt.uFlags & OS.TTF_IDISHWND) != 0) {
                        OS.SendMessage (menuItemToolTipHandle, OS.TTM_DELTOOL, 0, lptiMt);
                        OS.SendMessage (menuItemToolTipHandle, OS.TTM_ADDTOOL, 0, lptiMt);
                }
        }
}

/**
 * If the receiver is visible, moves it to the top of the
 * drawing order for the display on which it was created
 * (so that all other shells on that display, which are not
 * the receiver's children will be drawn behind it) and forces
 * the window manager to make the shell active.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 2.0
 * @see Control#moveAbove
 * @see Control#setFocus
 * @see Control#setVisible
 * @see Display#getActiveShell
 * @see Decorations#setDefaultButton(Button)
 * @see Shell#open
 * @see Shell#setActive
 */
public void forceActive () {
        checkWidget ();
        if(!isVisible()) return;
        OS.SetForegroundWindow (handle);
}

@Override
void forceResize () {
        /* Do nothing */
}

/**
 * Returns the receiver's alpha value. The alpha value
 * is between 0 (transparent) and 255 (opaque).
 *
 * @return the alpha value
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public int getAlpha () {
        checkWidget ();
        byte [] pbAlpha = new byte [1];
        if (OS.GetLayeredWindowAttributes (handle, null, pbAlpha, null)) {
                return pbAlpha [0] & 0xFF;
        }
        return 0xFF;
}

@Override Rectangle getBoundsInPixels () {
        if (OS.IsIconic (handle)) return super.getBoundsInPixels ();
        RECT rect = new RECT ();
        OS.GetWindowRect (handle, rect);
        int width = rect.right - rect.left;
        int height = rect.bottom - rect.top;
        return new Rectangle (rect.left, rect.top, width, height);
}

ToolTip getCurrentToolTip () {
        if (toolTipHandle != 0) {
                ToolTip tip = getCurrentToolTip (toolTipHandle);
                if (tip != null) return tip;
        }
        if (balloonTipHandle != 0) {
                ToolTip tip = getCurrentToolTip (balloonTipHandle);
                if (tip != null) return tip;
        }
        if (menuItemToolTipHandle != 0) {
                ToolTip tip = getCurrentToolTip (menuItemToolTipHandle);
                if (tip != null) return tip;
        }
        return null;
}

ToolTip getCurrentToolTip (long hwndToolTip) {
        if (hwndToolTip == 0) return null;
        if (OS.SendMessage (hwndToolTip, OS.TTM_GETCURRENTTOOL, 0, 0) != 0) {
                TOOLINFO lpti = new TOOLINFO ();
                lpti.cbSize = TOOLINFO.sizeof;
                if (OS.SendMessage (hwndToolTip, OS.TTM_GETCURRENTTOOL, 0, lpti) != 0) {
                        if ((lpti.uFlags & OS.TTF_IDISHWND) == 0) return findToolTip ((int)lpti.uId);
                }
        }
        return null;
}

@Override
public boolean getEnabled () {
        checkWidget ();
        return (state & DISABLED) == 0;
}

/**
 * Returns <code>true</code> if the receiver is currently
 * in fullscreen state, and false otherwise.
 * <p>
 *
 * @return the fullscreen state
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public boolean getFullScreen () {
        checkWidget();
        return fullScreen;
}

/**
 * Returns the receiver's input method editor mode. This
 * will be the result of bitwise OR'ing together one or
 * more of the following constants defined in class
 * <code>SWT</code>:
 * <code>NONE</code>, <code>ROMAN</code>, <code>DBCS</code>,
 * <code>PHONETIC</code>, <code>NATIVE</code>, <code>ALPHA</code>.
 *
 * @return the IME mode
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SWT
 */
public int getImeInputMode () {
        checkWidget ();
        if (!OS.IsDBLocale) return 0;
        long hIMC = OS.ImmGetContext (handle);
        int [] lpfdwConversion = new int [1], lpfdwSentence = new int [1];
        boolean open = OS.ImmGetOpenStatus (hIMC);
        if (open) open = OS.ImmGetConversionStatus (hIMC, lpfdwConversion, lpfdwSentence);
        OS.ImmReleaseContext (handle, hIMC);
        if (!open) return SWT.NONE;
        int result = 0;
        if ((lpfdwConversion [0] & OS.IME_CMODE_ROMAN) != 0) result |= SWT.ROMAN;
        if ((lpfdwConversion [0] & OS.IME_CMODE_FULLSHAPE) != 0) result |= SWT.DBCS;
        if ((lpfdwConversion [0] & OS.IME_CMODE_KATAKANA) != 0) return result | SWT.PHONETIC;
        if ((lpfdwConversion [0] & OS.IME_CMODE_NATIVE) != 0) return result | SWT.NATIVE;
        return result | SWT.ALPHA;
}

@Override Point getLocationInPixels () {
        if (OS.IsIconic (handle)) return super.getLocationInPixels ();
        RECT rect = new RECT ();
        OS.GetWindowRect (handle, rect);
        return new Point (rect.left, rect.top);
}

@Override
public boolean getMaximized () {
        checkWidget ();
        return !fullScreen && super.getMaximized ();
}

/**
 * Returns a point describing the minimum receiver's size. The
 * x coordinate of the result is the minimum width of the receiver.
 * The y coordinate of the result is the minimum height of the
 * receiver.
 *
 * @return the receiver's size
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.1
 */
public Point getMinimumSize () {
        checkWidget ();
        return DPIUtil.autoScaleDown(getMinimumSizeInPixels());
}

Point getMinimumSizeInPixels () {
        int width = Math.max (0, minWidth);
        int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
        if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
                width = Math.max (width, OS.GetSystemMetrics (OS.SM_CXMINTRACK));
        }
        int height = Math.max (0, minHeight);
        if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
                if ((style & SWT.RESIZE) != 0) {
                        height = Math.max (height, OS.GetSystemMetrics (OS.SM_CYMINTRACK));
                } else {
                        RECT rect = new RECT ();
                        int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
                        int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
                        OS.AdjustWindowRectEx (rect, bits1, false, bits2);
                        height = Math.max (height, rect.bottom - rect.top);
                }
        }
        return new Point (width,  height);
}

/**
 * Gets the receiver's modified state.
 *
 * @return <code>true</code> if the receiver is marked as modified, or <code>false</code> otherwise
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.5
 */
public boolean getModified () {
        checkWidget ();
        return modified;
}

/**
 * Returns the region that defines the shape of the shell,
 * or <code>null</code> if the shell has the default shape.
 *
 * @return the region that defines the shape of the shell, or <code>null</code>
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.0
 *
 */
@Override
public Region getRegion () {
        /* This method is needed for the @since 3.0 Javadoc */
        checkWidget ();
        return region;
}

@Override
public Shell getShell () {
        checkWidget ();
        return this;
}

@Override Point getSizeInPixels () {
        if (OS.IsIconic (handle)) return super.getSizeInPixels ();
        RECT rect = new RECT ();
        OS.GetWindowRect (handle, rect);
        int width = rect.right - rect.left;
        int height = rect.bottom - rect.top;
        return new Point (width, height);
}

/**
 * Returns an array containing all shells which are
 * descendants of the receiver.
 * <p>
 * @return the dialog shells
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Shell [] getShells () {
        checkWidget ();
        int count = 0;
        Shell [] shells = display.getShells ();
        for (int i=0; i<shells.length; i++) {
                Control shell = shells [i];
                do {
                        shell = shell.parent;
                } while (shell != null && shell != this);
                if (shell == this) count++;
        }
        int index = 0;
        Shell [] result = new Shell [count];
        for (int i=0; i<shells.length; i++) {
                Control shell = shells [i];
                do {
                        shell = shell.parent;
                } while (shell != null && shell != this);
                if (shell == this) {
                        result [index++] = shells [i];
                }
        }
        return result;
}

/**
 * Returns a ToolBar object representing the tool bar that can be shown in the receiver's
 * trim. This will return <code>null</code> if the platform does not support tool bars that
 * are not part of the content area of the shell, or if the Shell's style does not support
 * having a tool bar.
 * <p>
 *
 * @return a ToolBar object representing the Shell's tool bar, or <code>null</code>.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.7
 */
public ToolBar getToolBar() {
        checkWidget ();
        return null;
}

@Override
Composite findDeferredControl () {
        return layoutCount > 0 ? this : null;
}

@Override
public boolean isEnabled () {
        checkWidget ();
        return getEnabled ();
}

@Override
public boolean isVisible () {
        checkWidget ();
        return getVisible ();
}

long hwndMDIClient () {
        if (hwndMDIClient == 0) {
                int widgetStyle = OS.MDIS_ALLCHILDSTYLES | OS.WS_CHILD | OS.WS_CLIPCHILDREN | OS.WS_CLIPSIBLINGS;
                hwndMDIClient = OS.CreateWindowEx (
                        0,
                        new TCHAR (0, "MDICLIENT", true),
                        null,
                        widgetStyle,
                        0, 0, 0, 0,
                        handle,
                        0,
                        OS.GetModuleHandle (null),
                        new CREATESTRUCT ());
//              OS.ShowWindow (hwndMDIClient, OS.SW_SHOW);
        }
        return hwndMDIClient;
}

long menuItemToolTipHandle () {
        if (menuItemToolTipHandle == 0) createMenuItemToolTipHandle ();
        return menuItemToolTipHandle;
}

/**
 * Moves the receiver to the top of the drawing order for
 * the display on which it was created (so that all other
 * shells on that display, which are not the receiver's
 * children will be drawn behind it), marks it visible,
 * sets the focus and asks the window manager to make the
 * shell active.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see Control#moveAbove
 * @see Control#setFocus
 * @see Control#setVisible
 * @see Display#getActiveShell
 * @see Decorations#setDefaultButton(Button)
 * @see Shell#setActive
 * @see Shell#forceActive
 */
public void open () {
        checkWidget ();
        STARTUPINFO lpStartUpInfo = Display.lpStartupInfo;
        if (lpStartUpInfo == null || (lpStartUpInfo.dwFlags & OS.STARTF_USESHOWWINDOW) == 0) {
                bringToTop ();
                if (isDisposed ()) return;
        }
        OS.SendMessage (handle, OS.WM_CHANGEUISTATE, OS.UIS_INITIALIZE, 0);
        setVisible (true);
        if (isDisposed ()) return;
        /*
        * Bug in Windows XP.  Despite the fact that an icon has been
        * set for a window, the task bar displays the wrong icon the
        * first time the window is made visible with ShowWindow() after
        * a call to BringToTop(), when a long time elapses between the
        * ShowWindow() and the time the event queue is read.  The icon
        * in the window trimming is correct but the one in the task
        * bar does not get updated.  The fix is to call PeekMessage()
        * with the flag PM_NOREMOVE and PM_QS_SENDMESSAGE to respond
        * to a cross thread WM_GETICON.
        *
        * NOTE: This allows other cross thread messages to be delivered,
        * most notably WM_ACTIVATE.
        */
        MSG msg = new MSG ();
        int flags = OS.PM_NOREMOVE | OS.PM_NOYIELD | OS.PM_QS_SENDMESSAGE;
        OS.PeekMessage (msg, 0, 0, 0, flags);
        /*
         * When no widget has been given focus, or another push button has focus,
         * give focus to the default button. This avoids overriding the default
         * button.
         */
        boolean restored = restoreFocus ();
        if (!restored) {
                restored = traverseGroup (true);
        }
        if (restored) {
                Control focusControl = display.getFocusControl ();
                if (focusControl instanceof Button && (focusControl.style & SWT.PUSH) != 0) {
                        restored = false;
                }
        }
        if (!restored) {
                if (saveDefault != null && !saveDefault.isDisposed ()) {
                        saveDefault.setFocus ();
                } else {
                        setFocus ();
                }
        }
}

@Override
public boolean print (GC gc) {
        checkWidget ();
        if (gc == null) error (SWT.ERROR_NULL_ARGUMENT);
        if (gc.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
        return false;
}

@Override
void register () {
        super.register ();
        if (toolTipHandle != 0) display.addControl (toolTipHandle, this);
        if (balloonTipHandle != 0) display.addControl (balloonTipHandle, this);
        if (menuItemToolTipHandle != 0) display.addControl (menuItemToolTipHandle, this);
}

void releaseBrushes () {
        if (brushes != null) {
                for (int i=0; i<brushes.length; i++) {
                        if (brushes [i] != 0) OS.DeleteObject (brushes [i]);
                }
        }
        brushes = null;
}

@Override
void releaseChildren (boolean destroy) {
        Shell [] shells = getShells ();
        for (int i=0; i<shells.length; i++) {
                Shell shell = shells [i];
                if (shell != null && !shell.isDisposed ()) {
                        shell.release (false);
                }
        }
        if (toolTips != null) {
                for (int i=0; i<toolTips.length; i++) {
                        ToolTip toolTip = toolTips [i];
                        if (toolTip != null && !toolTip.isDisposed ()) {
                                toolTip.release (false);
                        }
                }
        }
        toolTips = null;
        super.releaseChildren (destroy);
}

@Override
void releaseHandle () {
        super.releaseHandle ();
        hwndMDIClient = 0;
}

@Override
void releaseParent () {
        /* Do nothing */
}

@Override
void releaseWidget () {
        super.releaseWidget ();
        releaseBrushes ();
        activeMenu = null;
        display.clearModal (this);
        if (lpstrTip != 0) {
                long hHeap = OS.GetProcessHeap ();
                OS.HeapFree (hHeap, 0, lpstrTip);
        }
        lpstrTip = 0;
        toolTipHandle = balloonTipHandle = menuItemToolTipHandle = 0;
        lastActive = null;
        toolTitle = balloonTitle = null;
}

@Override
void removeMenu (Menu menu) {
        super.removeMenu (menu);
        if (menu == activeMenu) activeMenu = null;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when operations are performed on the receiver.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see ShellListener
 * @see #addShellListener
 */
public void removeShellListener (ShellListener listener) {
        checkWidget ();
        if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
        if (eventTable == null) return;
        eventTable.unhook (SWT.Close, listener);
        eventTable.unhook (SWT.Iconify,listener);
        eventTable.unhook (SWT.Deiconify,listener);
        eventTable.unhook (SWT.Activate, listener);
        eventTable.unhook (SWT.Deactivate, listener);
}

@Override
public void requestLayout () {
        layout (null, SWT.DEFER);
}

@Override
void reskinChildren (int flags) {
        Shell [] shells = getShells ();
        for (int i=0; i<shells.length; i++) {
                Shell shell = shells [i];
                if (shell != null) shell.reskin (flags);
        }
        if (toolTips != null) {
                for (int i=0; i<toolTips.length; i++) {
                        ToolTip toolTip = toolTips [i];
                        if (toolTip != null) toolTip.reskin (flags);
                }
        }
        super.reskinChildren (flags);
}

@Override
boolean sendKeyEvent (int type, int msg, long wParam, long lParam, Event event) {
        if (!isEnabled () || !isActive ()) return false;
        return super.sendKeyEvent (type, msg, wParam, lParam, event);
}

/**
 * If the receiver is visible, moves it to the top of the
 * drawing order for the display on which it was created
 * (so that all other shells on that display, which are not
 * the receiver's children will be drawn behind it) and asks
 * the window manager to make the shell active
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 2.0
 * @see Control#moveAbove
 * @see Control#setFocus
 * @see Control#setVisible
 * @see Display#getActiveShell
 * @see Decorations#setDefaultButton(Button)
 * @see Shell#open
 * @see Shell#setActive
 */
public void setActive () {
        checkWidget ();
        if (!isVisible ()) return;
        bringToTop ();
        // widget could be disposed at this point
}

void setActiveControl (Control control) {
        setActiveControl (control, SWT.None);
}

void setActiveControl (Control control, int type) {
        if (control != null && control.isDisposed ()) control = null;
        if (lastActive != null && lastActive.isDisposed ()) lastActive = null;
        if (lastActive == control) return;

        /*
        * Compute the list of controls to be activated and
        * deactivated by finding the first common parent
        * control.
        */
        Control [] activate = (control == null) ? new Control [0] : control.getPath ();
        Control [] deactivate = (lastActive == null) ? new Control [0] : lastActive.getPath ();
        lastActive = control;
        int index = 0, length = Math.min (activate.length, deactivate.length);
        while (index < length) {
                if (activate [index] != deactivate [index]) break;
                index++;
        }

        /*
        * It is possible (but unlikely), that application
        * code could have destroyed some of the widgets. If
        * this happens, keep processing those widgets that
        * are not disposed.
        */
        for (int i=deactivate.length-1; i>=index; --i) {
                if (!deactivate [i].isDisposed ()) {
                        deactivate [i].sendEvent (SWT.Deactivate);
                }
        }
        for (int i=activate.length-1; i>=index; --i) {
                if (!activate [i].isDisposed ()) {
                        Event event = new Event ();
                        event.detail = type;
                        activate [i].sendEvent (SWT.Activate, event);
                }
        }
}

/**
 * Sets the receiver's alpha value which must be
 * between 0 (transparent) and 255 (opaque).
 * <p>
 * This operation requires the operating system's advanced
 * widgets subsystem which may not be available on some
 * platforms.
 * </p>
 * @param alpha the alpha value
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public void setAlpha (int alpha) {
        checkWidget ();
        alpha &= 0xFF;
        int bits = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
        if (alpha == 0xFF) {
                OS.SetWindowLong (handle, OS.GWL_EXSTYLE, bits & ~OS.WS_EX_LAYERED);
                int flags = OS.RDW_ERASE | OS.RDW_INVALIDATE | OS.RDW_FRAME | OS.RDW_ALLCHILDREN;
                OS.RedrawWindow (handle, null, 0, flags);
        } else {
                OS.SetWindowLong (handle, OS.GWL_EXSTYLE, bits | OS.WS_EX_LAYERED);
                OS.SetLayeredWindowAttributes (handle, 0, (byte)alpha, OS.LWA_ALPHA);
        }
}

@Override
void setBoundsInPixels (int x, int y, int width, int height, int flags, boolean defer) {
        if (fullScreen) setFullScreen (false);
        /*
        * Bug in Windows.  When a window has alpha and
        * SetWindowPos() is called with SWP_DRAWFRAME,
        * the contents of the window are copied rather
        * than allowing the windows underneath to draw.
        * This causes pixel corruption.  The fix is to
        * clear the SWP_DRAWFRAME bits.
        */
        int bits = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
        if ((bits & OS.WS_EX_LAYERED) != 0) {
                flags &= ~OS.SWP_DRAWFRAME;
        }
        super.setBoundsInPixels (x, y, width, height, flags, false);
}

@Override
public void setEnabled (boolean enabled) {
        checkWidget ();
        if (((state & DISABLED) == 0) == enabled) return;
        super.setEnabled (enabled);
        if (enabled && handle == OS.GetActiveWindow ()) {
                if (!restoreFocus ()) traverseGroup (true);
        }
}

/**
 * Sets the full screen state of the receiver.
 * If the argument is <code>true</code> causes the receiver
 * to switch to the full screen state, and if the argument is
 * <code>false</code> and the receiver was previously switched
 * into full screen state, causes the receiver to switch back
 * to either the maximized or normal states.
 * <p>
 * Note: The result of intermixing calls to <code>setFullScreen(true)</code>,
 * <code>setMaximized(true)</code> and <code>setMinimized(true)</code> will
 * vary by platform. Typically, the behavior will match the platform user's
 * expectations, but not always. This should be avoided if possible.
 * </p>
 *
 * @param fullScreen the new fullscreen state
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.4
 */
public void setFullScreen (boolean fullScreen) {
        checkWidget();
        if (this.fullScreen == fullScreen) return;
        int stateFlags = fullScreen ? OS.SW_SHOWMAXIMIZED : OS.SW_RESTORE;
        int styleFlags = OS.GetWindowLong (handle, OS.GWL_STYLE);
        int mask = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
        if ((style & mask) != 0) {
                if (fullScreen) {
                        styleFlags &= ~(OS.WS_CAPTION | OS.WS_MAXIMIZEBOX | OS.WS_MINIMIZEBOX | OS.WS_THICKFRAME);
                } else {
                        styleFlags |= OS.WS_CAPTION;
                        if ((style & SWT.MAX) != 0) styleFlags |= OS.WS_MAXIMIZEBOX;
                        if ((style & SWT.MIN) != 0) styleFlags |= OS.WS_MINIMIZEBOX;
                        if ((style & SWT.RESIZE) != 0) styleFlags |= OS.WS_THICKFRAME;
                }
        }
        if (fullScreen) wasMaximized = getMaximized ();
        boolean visible = isVisible ();
        OS.SetWindowLong (handle, OS.GWL_STYLE, styleFlags);
        if (wasMaximized) {
                OS.ShowWindow (handle, OS.SW_HIDE);
                stateFlags = OS.SW_SHOWMAXIMIZED;
        }
        if (visible) OS.ShowWindow (handle, stateFlags);
        OS.UpdateWindow (handle);
        this.fullScreen = fullScreen;
}

/**
 * Sets the input method editor mode to the argument which
 * should be the result of bitwise OR'ing together one or more
 * of the following constants defined in class <code>SWT</code>:
 * <code>NONE</code>, <code>ROMAN</code>, <code>DBCS</code>,
 * <code>PHONETIC</code>, <code>NATIVE</code>, <code>ALPHA</code>.
 *
 * @param mode the new IME mode
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SWT
 */
public void setImeInputMode (int mode) {
        checkWidget ();
        if (!OS.IsDBLocale) return;
        boolean imeOn = mode != SWT.NONE;
        long hIMC = OS.ImmGetContext (handle);
        OS.ImmSetOpenStatus (hIMC, imeOn);
        if (imeOn) {
                int [] lpfdwConversion = new int [1], lpfdwSentence = new int [1];
                if (OS.ImmGetConversionStatus (hIMC, lpfdwConversion, lpfdwSentence)) {
                        int newBits = 0;
                        int oldBits = OS.IME_CMODE_NATIVE | OS.IME_CMODE_KATAKANA;
                        if ((mode & SWT.PHONETIC) != 0) {
                                newBits = OS.IME_CMODE_KATAKANA | OS.IME_CMODE_NATIVE;
                                oldBits = 0;
                        } else {
                                if ((mode & SWT.NATIVE) != 0) {
                                        newBits = OS.IME_CMODE_NATIVE;
                                        oldBits = OS.IME_CMODE_KATAKANA;
                                }
                        }
                        boolean fullShape = (mode & SWT.DBCS) != 0;
                        if ((mode & SWT.NATIVE) != 0) {
                                long hkl = OS.GetKeyboardLayout (0);
                                int langid = OS.PRIMARYLANGID (OS.LOWORD (hkl));
                                if (langid == OS.LANG_JAPANESE) {
                                        fullShape = true;
                                }
                        }
                        if (fullShape) {
                                newBits |= OS.IME_CMODE_FULLSHAPE;
                        } else {
                                oldBits |= OS.IME_CMODE_FULLSHAPE;
                        }
                        if ((mode & SWT.ROMAN) != 0) {
                                newBits |= OS.IME_CMODE_ROMAN;
                        } else {
                                oldBits |= OS.IME_CMODE_ROMAN;
                        }
                        lpfdwConversion [0] |= newBits;
                        lpfdwConversion [0] &= ~oldBits;
                        OS.ImmSetConversionStatus (hIMC, lpfdwConversion [0], lpfdwSentence [0]);
                }
        }
        OS.ImmReleaseContext (handle, hIMC);
}

/**
 * Sets the receiver's minimum size to the size specified by the arguments.
 * If the new minimum size is larger than the current size of the receiver,
 * the receiver is resized to the new minimum size.
 *
 * @param width the new minimum width for the receiver
 * @param height the new minimum height for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.1
 */
public void setMinimumSize (int width, int height) {
        checkWidget ();
        setMinimumSizeInPixels(DPIUtil.autoScaleUp(width), DPIUtil.autoScaleUp(height));
}

void setMinimumSizeInPixels (int width, int height) {
        int widthLimit = 0, heightLimit = 0;
        int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
        if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
                widthLimit = OS.GetSystemMetrics (OS.SM_CXMINTRACK);
                if ((style & SWT.RESIZE) != 0) {
                        heightLimit = OS.GetSystemMetrics (OS.SM_CYMINTRACK);
                } else {
                        RECT rect = new RECT ();
                        int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
                        int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
                        OS.AdjustWindowRectEx (rect, bits1, false, bits2);
                        heightLimit = rect.bottom - rect.top;
                }
        }
        minWidth = Math.max (widthLimit, width);
        minHeight = Math.max (heightLimit, height);
        Point size = getSizeInPixels ();
        int newWidth = Math.max (size.x, minWidth);
        int newHeight = Math.max (size.y, minHeight);
        if (minWidth <= widthLimit) minWidth = SWT.DEFAULT;
        if (minHeight <= heightLimit) minHeight = SWT.DEFAULT;
        if (newWidth != size.x || newHeight != size.y) setSizeInPixels (newWidth, newHeight);
}

/**
 * Sets the receiver's minimum size to the size specified by the argument.
 * If the new minimum size is larger than the current size of the receiver,
 * the receiver is resized to the new minimum size.
 *
 * @param size the new minimum size for the receiver
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.1
 */
public void setMinimumSize (Point size) {
        checkWidget ();
        if (size == null) error (SWT.ERROR_NULL_ARGUMENT);
        size = DPIUtil.autoScaleUp(size);
        setMinimumSizeInPixels(size.x, size.y);
}

/**
 * Sets the receiver's modified state as specified by the argument.
 *
 * @param modified the new modified state for the receiver
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.5
 */
public void setModified (boolean modified) {
        checkWidget ();
        this.modified = modified;
}

void setItemEnabled (int cmd, boolean enabled) {
        long hMenu = OS.GetSystemMenu (handle, false);
        if (hMenu == 0) return;
        int flags = OS.MF_ENABLED;
        if (!enabled) flags = OS.MF_DISABLED | OS.MF_GRAYED;
        OS.EnableMenuItem (hMenu, cmd, OS.MF_BYCOMMAND | flags);
}

@Override
void setParent () {
        /* Do nothing.  Not necessary for Shells */
}

/**
 * Sets the shape of the shell to the region specified
 * by the argument.  When the argument is null, the
 * default shape of the shell is restored.  The shell
 * must be created with the style SWT.NO_TRIM in order
 * to specify a region.
 * <p>
 * NOTE: This method also sets the size of the shell. Clients should
 * not call {@link #setSize} or {@link #setBounds} on this shell.
 * Furthermore, the passed region should not be modified any more.
 * </p>
 *
 * @param region the region that defines the shape of the shell (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the region has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.0
 */
@Override
public void setRegion (Region region) {
        checkWidget ();
        if ((style & SWT.NO_TRIM) == 0) return;
        if (region != null) {
                Rectangle bounds = region.getBounds ();
                setSize (bounds.x + bounds.width, bounds.y + bounds.height);
        }
        super.setRegion (region);
}

void setToolTipText (long hwnd, String text) {
        TOOLINFO lpti = new TOOLINFO ();
        lpti.cbSize = TOOLINFO.sizeof;
        lpti.hwnd = handle;
        lpti.uId = hwnd;
        long hwndToolTip = toolTipHandle ();
        if (text == null) {
                OS.SendMessage (hwndToolTip, OS.TTM_DELTOOL, 0, lpti);
        } else {
                if (OS.SendMessage (hwndToolTip, OS.TTM_GETTOOLINFO, 0, lpti) != 0) {
                        OS.SendMessage (hwndToolTip, OS.TTM_UPDATE, 0, 0);
                } else {
                        lpti.uFlags = OS.TTF_IDISHWND | OS.TTF_SUBCLASS;
                        lpti.lpszText = OS.LPSTR_TEXTCALLBACK;
                        OS.SendMessage (hwndToolTip, OS.TTM_ADDTOOL, 0, lpti);
                }
        }
}

void setToolTipText (NMTTDISPINFO lpnmtdi, char [] buffer) {
        /*
        * Ensure that the current position of the mouse
        * is inside the client area of the shell.  This
        * prevents tool tips from popping up over the
        * shell trimmings.
        */
        if (!hasCursor ()) return;
        long hHeap = OS.GetProcessHeap ();
        if (lpstrTip != 0) OS.HeapFree (hHeap, 0, lpstrTip);
        int byteCount = buffer.length * 2;
        lpstrTip = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
        OS.MoveMemory (lpstrTip, buffer, byteCount);
        lpnmtdi.lpszText = lpstrTip;
}

void setToolTipTitle (long hwndToolTip, String text, int icon) {
        /*
        * Bug in Windows.  For some reason, when TTM_SETTITLE
        * is used to set the title of a tool tip, Windows leaks
        * GDI objects.  This happens even when TTM_SETTITLE is
        * called with TTI_NONE and NULL.  The documentation
        * states that Windows copies the icon and that the
        * programmer must free the copy but does not provide
        * API to get the icon.  For example, when TTM_SETTITLE
        * is called with ICON_ERROR, when TTM_GETTITLE is used
        * to query the title and the icon, the uTitleBitmap
        * field in the TTGETTITLE struct is zero.  The fix
        * is to remember these values, only set them when then
        * change and leak less.
        *
        * NOTE:  This only happens on Vista.
        */
        if (hwndToolTip != toolTipHandle && hwndToolTip != balloonTipHandle && hwndToolTip != menuItemToolTipHandle) {
                return;
        }
        if (hwndToolTip == toolTipHandle || hwndToolTip == menuItemToolTipHandle) {
                if (text == toolTitle || (toolTitle != null && toolTitle.equals (text))) {
                        if (icon == toolIcon) return;
                }
                toolTitle = text;
                toolIcon = icon;
        } else {
                if (hwndToolTip == balloonTipHandle) {
                        if (text == balloonTitle || (balloonTitle != null && balloonTitle.equals (text))) {
                                if (icon == toolIcon) return;
                        }
                        balloonTitle = text;
                        balloonIcon = icon;
                }
        }
        if (text != null) {
                /*
                * Feature in Windows. The text point to by pszTitle
                * must not exceed 100 characters in length, including
                * the null terminator.
                */
                if (text.length () > 99) text = text.substring (0, 99);
                TCHAR pszTitle = new TCHAR (getCodePage (), text, true);
                OS.SendMessage (hwndToolTip, OS.TTM_SETTITLE, icon, pszTitle);
        } else {
                OS.SendMessage (hwndToolTip, OS.TTM_SETTITLE, 0, 0);
        }
}

@Override
public void setVisible (boolean visible) {
        checkWidget ();
        /*
        * Feature in Windows.  When ShowWindow() is called used to hide
        * a window, Windows attempts to give focus to the parent. If the
        * parent is disabled by EnableWindow(), focus is assigned to
        * another windows on the desktop.  This means that if you hide
        * a modal window before the parent is enabled, the parent will
        * not come to the front.  The fix is to change the modal state
        * before hiding or showing a window so that this does not occur.
        */
        int mask = SWT.PRIMARY_MODAL | SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL;
        if ((style & mask) != 0) {
                if (visible) {
                        display.setModalShell (this);
                        if ((style & (SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {
                                display.setModalDialog (null);
                        }
                        Control control = display._getFocusControl ();
                        if (control != null && !control.isActive ()) {
                                bringToTop ();
                                if (isDisposed ()) return;
                        }
                        long hwndShell = OS.GetActiveWindow ();
                        if (hwndShell == 0) {
                                if (parent != null) hwndShell = parent.handle;
                        }
                        if (hwndShell != 0) {
                                OS.SendMessage (hwndShell, OS.WM_CANCELMODE, 0, 0);
                        }
                        OS.ReleaseCapture ();
                } else {
                        display.clearModal (this);
                }
        } else {
                updateModal ();
        }

        /*
        * Bug in Windows.  Calling ShowOwnedPopups() to hide the
        * child windows of a hidden window causes the application
        * to be deactivated.  The fix is to call ShowOwnedPopups()
        * to hide children before hiding the parent.
        */
        if (showWithParent && !visible) {
                OS.ShowOwnedPopups (handle, false);
        }
        if (!visible) fixActiveShell ();
        if (visible && center && !moved) {
                center ();
                if (isDisposed ()) return;
        }
        super.setVisible (visible);
        if (isDisposed ()) return;
        if (showWithParent != visible) {
                showWithParent = visible;
                if (visible) {
                        OS.ShowOwnedPopups (handle, true);
                }
        }

        /* Make the foreign window parent appear in the task bar */
        if (visible) {
                if (parent != null && (parent.state & FOREIGN_HANDLE) != 0) {
                        long hwndParent = parent.handle;
                        int style = OS.GetWindowLong (hwndParent, OS.GWL_EXSTYLE);
                        if ((style & OS.WS_EX_TOOLWINDOW) != 0) {
                                OS.SetWindowLong (hwndParent, OS.GWL_EXSTYLE, style & ~OS.WS_EX_TOOLWINDOW);
                                /*
                                * Bug in Windows.  The window does not show in the task bar when
                                * WS_EX_TOOLWINDOW is removed after the window has already been shown.
                                * The fix is to hide and shown the shell.
                                */
                                OS.ShowWindow (hwndParent, OS.SW_HIDE);
                                OS.ShowWindow (hwndParent, OS.SW_RESTORE);
                        }
                }
        }
}

@Override
void subclass () {
        super.subclass ();
        if (ToolTipProc != 0) {
                long newProc = display.windowProc;
                if (toolTipHandle != 0) {
                        OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, newProc);
                }
                if (balloonTipHandle != 0) {
                        OS.SetWindowLongPtr (balloonTipHandle, OS.GWLP_WNDPROC, newProc);
                }
                if (menuItemToolTipHandle != 0) {
                        OS.SetWindowLongPtr (menuItemToolTipHandle, OS.GWLP_WNDPROC, newProc);
                }
        }
}

long toolTipHandle () {
        if (toolTipHandle == 0) createToolTipHandle ();
        return toolTipHandle;
}

@Override
boolean translateAccelerator (MSG msg) {
        if (!isEnabled () || !isActive ()) return false;
        if (menuBar != null && !menuBar.isEnabled ()) return false;
        return translateMDIAccelerator (msg) || translateMenuAccelerator (msg);
}

@Override
boolean traverseEscape () {
        if (parent == null) return false;
        if (!isVisible () || !isEnabled ()) return false;
        close ();
        return true;
}

@Override
void unsubclass () {
        super.unsubclass ();
        if (ToolTipProc != 0) {
                if (toolTipHandle != 0) {
                        OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, ToolTipProc);
                }
                if (toolTipHandle != 0) {
                        OS.SetWindowLongPtr (toolTipHandle, OS.GWLP_WNDPROC, ToolTipProc);
                }
                if (menuItemToolTipHandle != 0) {
                        OS.SetWindowLongPtr (menuItemToolTipHandle, OS.GWLP_WNDPROC, ToolTipProc);
                }
        }
}

void updateModal () {
        if (Display.TrimEnabled) {
                setItemEnabled (OS.SC_CLOSE, isActive ());
        } else {
                OS.EnableWindow (handle, isActive ());
        }
}

@Override
CREATESTRUCT widgetCreateStruct () {
        return null;
}

@Override
long widgetParent () {
        if (handle != 0) return handle;
        return parent != null ? parent.handle : 0;
}

@Override
int widgetExtStyle () {
        int bits = super.widgetExtStyle () & ~OS.WS_EX_MDICHILD;
        if ((style & SWT.TOOL) != 0) bits |= OS.WS_EX_TOOLWINDOW;

        /*
        * Feature in Windows.  When a window that does not have a parent
        * is created, it is automatically added to the Windows Task Bar,
        * even when it has no title.  The fix is to use WS_EX_TOOLWINDOW
        * which does not cause the window to appear in the Task Bar.
        */
        if (parent == null) {
                if ((style & SWT.ON_TOP) != 0) {
                        int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
                        if ((style & SWT.NO_TRIM) != 0 || (style & trim) == 0) {
                                bits |= OS.WS_EX_TOOLWINDOW;
                        }
                }
        }

        if ((style & SWT.ON_TOP) != 0) bits |= OS.WS_EX_TOPMOST;
        return bits;
}

@Override
TCHAR windowClass () {
        if ((style & SWT.TOOL) != 0) {
                int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX | SWT.BORDER | SWT.RESIZE;
                if ((style & trim) == 0) return display.windowShadowClass;
        }
        return parent != null ? DialogClass : super.windowClass ();
}

@Override
long windowProc () {
        if (windowProc != 0) return windowProc;
        if ((style & SWT.TOOL) != 0) {
                int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX | SWT.BORDER | SWT.RESIZE;
                if ((style & trim) == 0) return super.windowProc ();
        }
        return parent != null ? DialogProc : super.windowProc ();
}

@Override
long windowProc (long hwnd, int msg, long wParam, long lParam) {
        if (handle == 0) return 0;
        if((style & SWT.NO_MOVE) != 0 && msg == OS.WM_NCLBUTTONDOWN && wParam == OS.HTCAPTION) return 0;
        if (hwnd == toolTipHandle || hwnd == balloonTipHandle || hwnd == menuItemToolTipHandle) {
                switch (msg) {
                        case OS.WM_TIMER: {
                                if (wParam != ToolTip.TIMER_ID) break;
                                ToolTip tip = getCurrentToolTip (hwnd);
                                if (tip != null && tip.autoHide) {
                                        tip.setVisible (false);
                                }
                                break;
                        }
                        case OS.WM_LBUTTONDOWN: {
                                ToolTip tip = getCurrentToolTip (hwnd);
                                if (tip != null) {
                                        tip.setVisible (false);
                                        tip.sendSelectionEvent (SWT.Selection);
                                }
                                break;
                        }
                }
                return callWindowProc (hwnd, msg, wParam, lParam);
        }
        if (hwnd == handle) {
                if ((int)msg == Display.TASKBARBUTTONCREATED) {
                        if (display.taskBar != null) {
                                for (TaskItem item : display.taskBar.items) {
                                        if (item != null && item.shell == this) {
                                                item.recreate ();
                                                break;
                                        }
                                }
                        }
                }
        }
        return super.windowProc (hwnd, msg, wParam, lParam);
}

@Override
int widgetStyle () {
        int bits = super.widgetStyle ();
        if (handle != 0) return bits | OS.WS_CHILD;
        bits &= ~OS.WS_CHILD;

        /*
        * Use WS_OVERLAPPED for all windows, either dialog or top level
        * so that CreateWindowEx () will respect CW_USEDEFAULT and set
        * the default window location and size.
        *
        * NOTE:  When a WS_OVERLAPPED window is created, Windows gives
        * the new window WS_CAPTION style bits.  These two constants are
        * as follows:
        *
        *       WS_OVERLAPPED = 0
        *       WS_CAPTION = WS_BORDER | WS_DLGFRAME
        *
        */
        return bits | OS.WS_OVERLAPPED | OS.WS_CAPTION;
}

@Override
LRESULT WM_ACTIVATE (long wParam, long lParam) {
        /*
        * Bug in Windows XP.  When a Shell is deactivated, the
        * IME composition window does not go away. This causes
        * repaint issues.  The fix is to commit the composition
        * string.
        */
        if (OS.LOWORD (wParam) == 0 && OS.IsDBLocale && hIMC != 0) {
                if (OS.ImmGetOpenStatus (hIMC)) {
                        OS.ImmNotifyIME (hIMC, OS.NI_COMPOSITIONSTR, OS.CPS_COMPLETE, 0);
                }
        }

        /* Process WM_ACTIVATE */
        LRESULT result = super.WM_ACTIVATE (wParam, lParam);
        if (OS.LOWORD (wParam) == 0) {
                if (lParam == 0 || (lParam != toolTipHandle && lParam != balloonTipHandle
                                && lParam != menuItemToolTipHandle)) {
                        ToolTip tip = getCurrentToolTip ();
                        if (tip != null) tip.setVisible (false);
                }
        }
        return parent != null ? LRESULT.ZERO : result;
}

@Override
LRESULT WM_DESTROY (long wParam, long lParam) {
        LRESULT result = super.WM_DESTROY (wParam, lParam);
        /*
        * When the shell is a WS_CHILD window of a non-SWT
        * window, the destroy code does not get called because
        * the non-SWT window does not call dispose ().  Instead,
        * the destroy code is called here in WM_DESTROY.
        */
        int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
        if ((bits & OS.WS_CHILD) != 0) {
                releaseParent ();
                release (false);
        }
        return result;
}

@Override
LRESULT WM_ERASEBKGND (long wParam, long lParam) {
        LRESULT result = super.WM_ERASEBKGND (wParam, lParam);
        if (result != null) return result;
        /*
        * Feature in Windows.  When a shell is resized by dragging
        * the resize handles, Windows temporarily fills in black
        * rectangles where the new contents of the shell should
        * draw.  The fix is to always draw the background of shells.
        *
        * NOTE: This only happens on Vista.
        */
        if (OS.WIN32_VERSION == OS.VERSION (6, 0)) {
                drawBackground (wParam);
                return LRESULT.ONE;
        }
        return result;
}

@Override
LRESULT WM_ENTERIDLE (long wParam, long lParam) {
        LRESULT result = super.WM_ENTERIDLE (wParam, lParam);
        if (result != null) return result;
        Display display = this.display;
        if (display.runAsyncMessages (false)) display.wakeThread ();
        return result;
}

@Override
LRESULT WM_GETMINMAXINFO (long wParam, long lParam) {
        LRESULT result = super.WM_GETMINMAXINFO (wParam, lParam);
        if (result != null) return result;
        if (minWidth != SWT.DEFAULT || minHeight != SWT.DEFAULT) {
                MINMAXINFO info = new MINMAXINFO ();
                OS.MoveMemory (info, lParam, MINMAXINFO.sizeof);
                if (minWidth != SWT.DEFAULT) info.ptMinTrackSize_x = minWidth;
                if (minHeight != SWT.DEFAULT) info.ptMinTrackSize_y = minHeight;
                OS.MoveMemory (lParam, info, MINMAXINFO.sizeof);
                return LRESULT.ZERO;
        }
        return result;
}

@Override
LRESULT WM_MOUSEACTIVATE (long wParam, long lParam) {
        LRESULT result = super.WM_MOUSEACTIVATE (wParam, lParam);
        if (result != null) return result;

        /*
        * Check for WM_MOUSEACTIVATE when an MDI shell is active
        * and stop the normal shell activation but allow the mouse
        * down to be delivered.
        */
        int hittest = (short) OS.LOWORD (lParam);
        switch (hittest) {
                case OS.HTERROR:
                case OS.HTTRANSPARENT:
                case OS.HTNOWHERE:
                        break;
                default: {
                        Control control = display._getFocusControl ();
                        if (control != null) {
                                Decorations decorations = control.menuShell ();
                                if (decorations.getShell () == this && decorations != this) {
                                        display.ignoreRestoreFocus = true;
                                        display.lastHittest = hittest;
                                        display.lastHittestControl = null;
                                        if (hittest == OS.HTMENU || hittest == OS.HTSYSMENU) {
                                                display.lastHittestControl = control;
                                                return null;
                                        }
                                        return new LRESULT (OS.MA_NOACTIVATE);
                                }
                        }
                }
        }
        if (hittest == OS.HTMENU) return null;

        /*
        * Get the current location of the cursor,
        * not the location of the cursor when the
        * WM_MOUSEACTIVATE was generated.  This is
        * strictly incorrect but is necessary in
        * order to support Activate and Deactivate
        * events for embedded widgets that have
        * their own event loop.  In that case, the
        * cursor location reported by GetMessagePos()
        * is the one for our event loop, not the
        * embedded widget's event loop.
        */
        POINT pt = new POINT ();
        if (!OS.GetCursorPos (pt)) {
                int pos = OS.GetMessagePos ();
                OS.POINTSTOPOINT (pt, pos);
        }
        long hwnd = OS.WindowFromPoint (pt);
        if (hwnd == 0) return null;
        Control control = display.findControl (hwnd);

        /*
        * When a shell is created with SWT.ON_TOP and SWT.NO_FOCUS,
        * do not activate the shell when the user clicks on the
        * the client area or on the border or a control within the
        * shell that does not take focus.
        */
        if (control != null && (control.state & CANVAS) != 0) {
                if ((control.style & SWT.NO_FOCUS) != 0) {
                        int bits = SWT.ON_TOP | SWT.NO_FOCUS;
                        if ((style & bits) == bits) {
                                if (hittest == OS.HTBORDER || hittest == OS.HTCLIENT) {
                                        return new LRESULT (OS.MA_NOACTIVATE);
                                }
                        }
                }
        }

        long code = callWindowProc (handle, OS.WM_MOUSEACTIVATE, wParam, lParam);
        setActiveControl (control, SWT.MouseDown);
        return new LRESULT (code);
}

@Override
LRESULT WM_MOVE (long wParam, long lParam) {
        LRESULT result = super.WM_MOVE (wParam, lParam);
        if (result != null) return result;
        ToolTip tip = getCurrentToolTip ();
        if (tip != null) tip.setVisible (false);
        return result;
}

@Override
LRESULT WM_NCHITTEST (long wParam, long lParam) {
        if (!OS.IsWindowEnabled (handle)) return null;
        if (!isEnabled () || !isActive ()) {
                if (!Display.TrimEnabled) return new LRESULT (OS.HTNOWHERE);
                long hittest = callWindowProc (handle, OS.WM_NCHITTEST, wParam, lParam);
                if (hittest == OS.HTCLIENT || hittest == OS.HTMENU) hittest = OS.HTBORDER;
                return new LRESULT (hittest);
        }
        if (menuBar != null && !menuBar.getEnabled ()) {
                long hittest = callWindowProc (handle, OS.WM_NCHITTEST, wParam, lParam);
                if (hittest == OS.HTMENU) hittest = OS.HTBORDER;
                return new LRESULT (hittest);
        }
        return null;
}

@Override
LRESULT WM_NCLBUTTONDOWN (long wParam, long lParam) {
        LRESULT result = super.WM_NCLBUTTONDOWN (wParam, lParam);
        if (result != null) return result;
        /*
        * When the normal activation was interrupted in WM_MOUSEACTIVATE
        * because the active shell was an MDI shell, set the active window
        * to the top level shell but lock the active window and stop focus
        * changes.  This allows the user to interact the top level shell
        * in the normal manner.
        */
        if (!display.ignoreRestoreFocus) return result;
        Display display = this.display;
        display.lockActiveWindow = true;
        long code = callWindowProc (handle, OS.WM_NCLBUTTONDOWN, wParam, lParam);
        display.lockActiveWindow = false;
        Control focusControl = display.lastHittestControl;
        if (focusControl != null && !focusControl.isDisposed ()) {
                focusControl.setFocus ();
        }
        display.lastHittestControl = null;
        display.ignoreRestoreFocus = false;
        return new LRESULT (code);
}

@Override
LRESULT WM_SETCURSOR (long wParam, long lParam) {
        /*
        * Feature in Windows.  When the shell is disabled
        * by a Windows standard dialog (like a MessageBox
        * or FileDialog), clicking in the shell does not
        * bring the shell or the dialog to the front. The
        * fix is to detect this case and bring the shell
        * forward.
        */
        int msg = OS.HIWORD (lParam);
        if (msg == OS.WM_LBUTTONDOWN) {
                if (!Display.TrimEnabled) {
                        Shell modalShell = display.getModalShell ();
                        if (modalShell != null && !isActive ()) {
                                long hwndModal = modalShell.handle;
                                if (OS.IsWindowEnabled (hwndModal)) {
                                        OS.SetActiveWindow (hwndModal);
                                }
                        }
                }
                if (!OS.IsWindowEnabled (handle)) {
                        long hwndPopup = OS.GetLastActivePopup (handle);
                        if (hwndPopup != 0 && hwndPopup != handle) {
                                if (display.getControl (hwndPopup) == null) {
                                        if (OS.IsWindowEnabled (hwndPopup)) {
                                                OS.SetActiveWindow (hwndPopup);
                                        }
                                }
                        }
                }
        }
        /*
        * When the shell that contains a cursor is disabled,
        * WM_SETCURSOR is called with HTERROR.  Normally,
        * when a control is disabled, the parent will get
        * mouse and cursor events.  In the case of a disabled
        * shell, there is no enabled parent.  In order to
        * show the cursor when a shell is disabled, it is
        * necessary to override WM_SETCURSOR when called
        * with HTERROR to set the cursor but only when the
        * mouse is in the client area of the shell.
        */
        int hitTest = (short) OS.LOWORD (lParam);
        if (hitTest == OS.HTERROR) {
                if (!getEnabled ()) {
                        Control control = display.getControl (wParam);
                        if (control == this && cursor != null) {
                                POINT pt = new POINT ();
                                int pos = OS.GetMessagePos ();
                                OS.POINTSTOPOINT (pt, pos);
                                OS.ScreenToClient (handle, pt);
                                RECT rect = new RECT ();
                                OS.GetClientRect (handle, rect);
                                if (OS.PtInRect (rect, pt)) {
                                        OS.SetCursor (cursor.handle);
                                        switch (msg) {
                                                case OS.WM_LBUTTONDOWN:
                                                case OS.WM_RBUTTONDOWN:
                                                case OS.WM_MBUTTONDOWN:
                                                case OS.WM_XBUTTONDOWN:
                                                        OS.MessageBeep (OS.MB_OK);
                                        }
                                        return LRESULT.ONE;
                                }
                        }
                }
        }
        return super.WM_SETCURSOR (wParam, lParam);
}

@Override
LRESULT WM_SHOWWINDOW (long wParam, long lParam) {
        LRESULT result = super.WM_SHOWWINDOW (wParam, lParam);
        if (result != null) return result;
        /*
        * Bug in Windows.  If the shell is hidden while the parent
        * is iconic,  Windows shows the shell when the parent is
        * deiconified.  This does not happen if the shell is hidden
        * while the parent is not an icon.  The fix is to track
        * visible state for the shell and refuse to show the shell
        * when the parent is shown.
        */
        if (lParam == OS.SW_PARENTOPENING) {
                Control control = this;
                while (control != null) {
                        Shell shell = control.getShell ();
                        if (!shell.showWithParent) return LRESULT.ZERO;
                        control = control.parent;
                }
        }
        return result;
}

@Override
LRESULT WM_WINDOWPOSCHANGING (long wParam, long lParam) {
        LRESULT result = super.WM_WINDOWPOSCHANGING (wParam,lParam);
        if (result != null) return result;
        WINDOWPOS lpwp = new WINDOWPOS ();
        OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
        if ((lpwp.flags & OS.SWP_NOSIZE) == 0) {
                lpwp.cx = Math.max (lpwp.cx, minWidth);
                int trim = SWT.TITLE | SWT.CLOSE | SWT.MIN | SWT.MAX;
                if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
                        lpwp.cx = Math.max (lpwp.cx, OS.GetSystemMetrics (OS.SM_CXMINTRACK));
                }
                lpwp.cy = Math.max (lpwp.cy, minHeight);
                if ((style & SWT.NO_TRIM) == 0 && (style & trim) != 0) {
                        if ((style & SWT.RESIZE) != 0) {
                                lpwp.cy = Math.max (lpwp.cy, OS.GetSystemMetrics (OS.SM_CYMINTRACK));
                        } else {
                                RECT rect = new RECT ();
                                int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
                                int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
                                OS.AdjustWindowRectEx (rect, bits1, false, bits2);
                                lpwp.cy = Math.max (lpwp.cy, rect.bottom - rect.top);
                        }
                }
                OS.MoveMemory (lParam, lpwp, WINDOWPOS.sizeof);
        }
        return result;
}
}