--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2012 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.win32.*;
+
+/**
+ * Instances of the receiver represent a selectable user
+ * interface object that present a range of continuous
+ * numeric values.
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>HORIZONTAL, VERTICAL</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>Selection</dd>
+ * </dl>
+ * <p>
+ * Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
+ * </p>
+ * <p>
+ * IMPORTANT: This class is <em>not</em> intended to be subclassed.
+ * </p>
+ *
+ * @see <a href="http://www.eclipse.org/swt/snippets/#scale">Scale 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 Scale extends Control {
+ boolean ignoreResize, ignoreSelection;
+ static final long TrackBarProc;
+ static final TCHAR TrackBarClass = new TCHAR (0, OS.TRACKBAR_CLASS, true);
+ boolean createdAsRTL;
+ static {
+ WNDCLASS lpWndClass = new WNDCLASS ();
+ OS.GetClassInfo (0, TrackBarClass, lpWndClass);
+ TrackBarProc = lpWndClass.lpfnWndProc;
+ /*
+ * Feature in Windows. The track bar window class
+ * does not include CS_DBLCLKS. This means that these
+ * controls will not get double click messages such as
+ * WM_LBUTTONDBLCLK. The fix is to register a new
+ * window class with CS_DBLCLKS.
+ *
+ * NOTE: Screen readers look for the exact class name
+ * of the control in order to provide the correct kind
+ * of assistance. Therefore, it is critical that the
+ * new window class have the same name. It is possible
+ * to register a local window class with the same name
+ * as a global class. Since bits that affect the class
+ * are being changed, it is possible that other native
+ * code, other than SWT, could create a control with
+ * this class name, and fail unexpectedly.
+ */
+ lpWndClass.hInstance = OS.GetModuleHandle (null);
+ lpWndClass.style &= ~OS.CS_GLOBALCLASS;
+ lpWndClass.style |= OS.CS_DBLCLKS;
+ OS.RegisterClass (TrackBarClass, lpWndClass);
+ }
+
+/**
+ * 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>
+ *
+ * @param parent a composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ * <li>ERROR_NULL_ARGUMENT - if the parent is null</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#HORIZONTAL
+ * @see SWT#VERTICAL
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public Scale (Composite parent, int style) {
+ super (parent, checkStyle (style));
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the user changes the receiver's value, by sending
+ * it one of the messages defined in the <code>SelectionListener</code>
+ * interface.
+ * <p>
+ * <code>widgetSelected</code> is called when the user changes the receiver's value.
+ * <code>widgetDefaultSelected</code> is not called.
+ * </p>
+ *
+ * @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 SelectionListener
+ * @see #removeSelectionListener
+ */
+public void addSelectionListener(SelectionListener listener) {
+ checkWidget ();
+ if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
+ TypedListener typedListener = new TypedListener (listener);
+ addListener (SWT.Selection,typedListener);
+ addListener (SWT.DefaultSelection,typedListener);
+}
+
+@Override
+long callWindowProc (long hwnd, int msg, long wParam, long lParam) {
+ if (handle == 0) return 0;
+ return OS.CallWindowProc (TrackBarProc, hwnd, msg, wParam, lParam);
+}
+
+static int checkStyle (int style) {
+ return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
+}
+
+@Override Point computeSizeInPixels (int wHint, int hHint, boolean changed) {
+ checkWidget ();
+ int border = getBorderWidthInPixels ();
+ int width = border * 2, height = border * 2;
+ RECT rect = new RECT ();
+ OS.SendMessage (handle, OS.TBM_GETTHUMBRECT, 0, rect);
+ if ((style & SWT.HORIZONTAL) != 0) {
+ width += OS.GetSystemMetrics (OS.SM_CXHSCROLL) * 10;
+ int scrollY = OS.GetSystemMetrics (OS.SM_CYHSCROLL);
+ height += (rect.top * 2) + scrollY + (scrollY / 3);
+ } else {
+ int scrollX = OS.GetSystemMetrics (OS.SM_CXVSCROLL);
+ width += (rect.left * 2) + scrollX + (scrollX / 3);
+ height += OS.GetSystemMetrics (OS.SM_CYVSCROLL) * 10;
+ }
+ if (wHint != SWT.DEFAULT) width = wHint + (border * 2);
+ if (hHint != SWT.DEFAULT) height = hHint + (border * 2);
+ return new Point (width, height);
+}
+
+@Override
+void createHandle () {
+ super.createHandle ();
+ state |= THEME_BACKGROUND | DRAW_BACKGROUND;
+ OS.SendMessage (handle, OS.TBM_SETRANGEMAX, 0, 100);
+ OS.SendMessage (handle, OS.TBM_SETPAGESIZE, 0, 10);
+ OS.SendMessage (handle, OS.TBM_SETTICFREQ, 10, 0);
+ createdAsRTL = (style & SWT.RIGHT_TO_LEFT) != 0;
+}
+
+@Override
+int defaultForeground () {
+ return OS.GetSysColor (OS.COLOR_BTNFACE);
+}
+
+/**
+ * Returns the amount that the receiver's value will be
+ * modified by when the up/down (or right/left) arrows
+ * are pressed.
+ *
+ * @return the increment
+ *
+ * @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 int getIncrement () {
+ checkWidget ();
+ return (int)OS.SendMessage (handle, OS.TBM_GETLINESIZE, 0, 0);
+}
+
+/**
+ * Returns the maximum value which the receiver will allow.
+ *
+ * @return the maximum
+ *
+ * @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 int getMaximum () {
+ checkWidget ();
+ return (int)OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0);
+}
+
+/**
+ * Returns the minimum value which the receiver will allow.
+ *
+ * @return the minimum
+ *
+ * @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 int getMinimum () {
+ checkWidget ();
+ return (int)OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0);
+}
+
+/**
+ * Returns the amount that the receiver's value will be
+ * modified by when the page increment/decrement areas
+ * are selected.
+ *
+ * @return the page increment
+ *
+ * @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 int getPageIncrement () {
+ checkWidget ();
+ return (int)OS.SendMessage (handle, OS.TBM_GETPAGESIZE, 0, 0);
+}
+
+/**
+ * Returns the 'selection', which is the receiver's position.
+ *
+ * @return the selection
+ *
+ * @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 int getSelection () {
+ checkWidget ();
+ return (int)OS.SendMessage (handle, OS.TBM_GETPOS, 0, 0);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the user changes the receiver's value.
+ *
+ * @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 SelectionListener
+ * @see #addSelectionListener
+ */
+public void removeSelectionListener(SelectionListener listener) {
+ checkWidget ();
+ if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
+ if (eventTable == null) return;
+ eventTable.unhook (SWT.Selection, listener);
+ eventTable.unhook (SWT.DefaultSelection,listener);
+}
+
+@Override
+void setBackgroundImage (long hImage) {
+ super.setBackgroundImage (hImage);
+ /*
+ * Bug in Windows. Changing the background color of the Scale
+ * widget and calling InvalidateRect() still draws with the old
+ * color. The fix is to send a fake WM_SIZE event to cause
+ * it to redraw with the new background color.
+ */
+ ignoreResize = true;
+ OS.SendMessage (handle, OS.WM_SIZE, 0, 0);
+ ignoreResize = false;
+}
+
+@Override
+void setBackgroundPixel (int pixel) {
+ super.setBackgroundPixel (pixel);
+ /*
+ * Bug in Windows. Changing the background color of the Scale
+ * widget and calling InvalidateRect() still draws with the old
+ * color. The fix is to send a fake WM_SIZE event to cause
+ * it to redraw with the new background color.
+ */
+ ignoreResize = true;
+ OS.SendMessage (handle, OS.WM_SIZE, 0, 0);
+ ignoreResize = false;
+}
+
+@Override
+void setBoundsInPixels (int x, int y, int width, int height, int flags, boolean defer) {
+ /*
+ * Bug in Windows. If SetWindowPos() is called on a
+ * track bar with either SWP_DRAWFRAME, a new size,
+ * or both during mouse down, the track bar posts a
+ * WM_MOUSEMOVE message when the mouse has not moved.
+ * The window proc for the track bar uses WM_MOUSEMOVE
+ * to issue WM_HSCROLL or WM_SCROLL events to notify
+ * the application that the slider has changed. The
+ * end result is that when the user requests a page
+ * scroll and the application resizes the track bar
+ * during the change notification, continuous stream
+ * of WM_MOUSEMOVE messages are generated and the
+ * thumb moves to the mouse position rather than
+ * scrolling by a page. The fix is to clear the
+ * SWP_DRAWFRAME flag.
+ *
+ * NOTE: There is no fix for the WM_MOUSEMOVE that
+ * is generated by a new size. Clearing SWP_DRAWFRAME
+ * does not fix the problem. However, it is unlikely
+ * that the programmer will resize the control during
+ * mouse down.
+ */
+ flags &= ~OS.SWP_DRAWFRAME;
+ super.setBoundsInPixels (x, y, width, height, flags, true);
+}
+
+/**
+ * Sets the amount that the receiver's value will be
+ * modified by when the up/down (or right/left) arrows
+ * are pressed to the argument, which must be at least
+ * one.
+ *
+ * @param increment the new increment (must be greater than zero)
+ *
+ * @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 void setIncrement (int increment) {
+ checkWidget ();
+ if (increment < 1) return;
+ int minimum = (int)OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0);
+ int maximum = (int)OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0);
+ if (increment > maximum - minimum) return;
+ OS.SendMessage (handle, OS.TBM_SETLINESIZE, 0, increment);
+}
+
+/**
+ * Sets the maximum value that the receiver will allow. This new
+ * value will be ignored if it is not greater than the receiver's current
+ * minimum value. If the new maximum is applied then the receiver's
+ * selection value will be adjusted if necessary to fall within its new range.
+ *
+ * @param value the new maximum, which must be greater than the current minimum
+ *
+ * @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 void setMaximum (int value) {
+ checkWidget ();
+ int minimum = (int)OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0);
+ if (0 <= minimum && minimum < value) {
+ OS.SendMessage (handle, OS.TBM_SETRANGEMAX, 1, value);
+ }
+}
+
+/**
+ * Sets the minimum value that the receiver will allow. This new
+ * value will be ignored if it is negative or is not less than the receiver's
+ * current maximum value. If the new minimum is applied then the receiver's
+ * selection value will be adjusted if necessary to fall within its new range.
+ *
+ * @param value the new minimum, which must be nonnegative and less than the current maximum
+ *
+ * @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 void setMinimum (int value) {
+ checkWidget ();
+ int maximum = (int)OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0);
+ if (0 <= value && value < maximum) {
+ OS.SendMessage (handle, OS.TBM_SETRANGEMIN, 1, value);
+ }
+}
+
+/**
+ * Sets the amount that the receiver's value will be
+ * modified by when the page increment/decrement areas
+ * are selected to the argument, which must be at least
+ * one.
+ *
+ * @param pageIncrement the page increment (must be greater than zero)
+ *
+ * @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 void setPageIncrement (int pageIncrement) {
+ checkWidget ();
+ if (pageIncrement < 1) return;
+ int minimum = (int)OS.SendMessage (handle, OS.TBM_GETRANGEMIN, 0, 0);
+ int maximum = (int)OS.SendMessage (handle, OS.TBM_GETRANGEMAX, 0, 0);
+ if (pageIncrement > maximum - minimum) return;
+ OS.SendMessage (handle, OS.TBM_SETPAGESIZE, 0, pageIncrement);
+ OS.SendMessage (handle, OS.TBM_SETTICFREQ, pageIncrement, 0);
+}
+
+/**
+ * Sets the 'selection', which is the receiver's value,
+ * to the argument which must be greater than or equal to zero.
+ *
+ * @param value the new selection (must be zero or greater)
+ *
+ * @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 void setSelection (int value) {
+ checkWidget ();
+ OS.SendMessage (handle, OS.TBM_SETPOS, 1, value);
+}
+
+@Override
+int widgetStyle () {
+ int bits = super.widgetStyle () | OS.WS_TABSTOP | OS.TBS_BOTH | OS.TBS_AUTOTICKS;
+ if ((style & SWT.HORIZONTAL) != 0) return bits | OS.TBS_HORZ | OS.TBS_DOWNISLEFT;
+ return bits | OS.TBS_VERT;
+}
+
+@Override
+TCHAR windowClass () {
+ return TrackBarClass;
+}
+
+@Override
+long windowProc () {
+ return TrackBarProc;
+}
+
+@Override
+LRESULT WM_KEYDOWN (long wParam, long lParam) {
+ LRESULT result = super.WM_KEYDOWN (wParam, lParam);
+ if (result != null) return result;
+ switch ((int)wParam) {
+ case OS.VK_LEFT:
+ case OS.VK_RIGHT:
+ /*
+ * Bug in Windows. The behavior for the left and right keys is not
+ * changed if the orientation changes after the control was created.
+ * The fix is to replace VK_LEFT by VK_RIGHT and VK_RIGHT by VK_LEFT
+ * when the current orientation differs from the orientation used to
+ * create the control.
+ */
+ boolean isRTL = (style & SWT.RIGHT_TO_LEFT) != 0;
+ if (isRTL != createdAsRTL) {
+ long code = callWindowProc (handle, OS.WM_KEYDOWN, wParam == OS.VK_RIGHT ? OS.VK_LEFT : OS.VK_RIGHT, lParam);
+ return new LRESULT (code);
+ }
+ break;
+ }
+ return result;
+}
+
+@Override
+LRESULT WM_MOUSEWHEEL (long wParam, long lParam) {
+ LRESULT result = super.WM_MOUSEWHEEL (wParam, lParam);
+ if (result != null) return result;
+ /*
+ * Bug in Windows. When a track bar slider is changed
+ * from WM_MOUSEWHEEL, it does not always send either
+ * a WM_VSCROLL or M_HSCROLL to notify the application
+ * of the change. The fix is to detect that the selection
+ * has changed and that notification has not been issued
+ * and send the selection event.
+ */
+ int oldPosition = (int)OS.SendMessage (handle, OS.TBM_GETPOS, 0, 0);
+ ignoreSelection = true;
+ long code = callWindowProc (handle, OS.WM_MOUSEWHEEL, wParam, lParam);
+ ignoreSelection = false;
+ int newPosition = (int)OS.SendMessage (handle, OS.TBM_GETPOS, 0, 0);
+ if (oldPosition != newPosition) {
+ /*
+ * Send the event because WM_HSCROLL and WM_VSCROLL
+ * are sent from a modal message loop in windows that
+ * is active when the user is scrolling.
+ */
+ sendSelectionEvent (SWT.Selection, null, true);
+ // widget could be disposed at this point
+ }
+ return new LRESULT (code);
+}
+
+@Override
+LRESULT WM_PAINT (long wParam, long lParam) {
+ if ((state & DISPOSE_SENT) != 0) return LRESULT.ZERO;
+
+ /*
+ * Bug in Windows. For some reason, when WM_CTLCOLORSTATIC
+ * is used to implement transparency and returns a NULL brush,
+ * Windows doesn't always draw the track bar. It seems that
+ * it is drawn correctly the first time. It is possible that
+ * Windows double buffers the control and the double buffer
+ * strategy fails when WM_CTLCOLORSTATIC returns unexpected
+ * results. The fix is to send a fake WM_SIZE to force it
+ * to redraw every time there is a WM_PAINT.
+ */
+ boolean fixPaint = findBackgroundControl () != null;
+ if (!fixPaint) {
+ if (OS.IsAppThemed ()) {
+ Control control = findThemeControl ();
+ fixPaint = control != null;
+ }
+ }
+ if (fixPaint) {
+ boolean redraw = getDrawing () && OS.IsWindowVisible (handle);
+ if (redraw) OS.SendMessage (handle, OS.WM_SETREDRAW, 0, 0);
+ ignoreResize = true;
+ OS.SendMessage (handle, OS.WM_SIZE, 0, 0);
+ ignoreResize = false;
+ if (redraw) {
+ OS.SendMessage (handle, OS.WM_SETREDRAW, 1, 0);
+ OS.InvalidateRect (handle, null, false);
+ }
+ }
+ return super.WM_PAINT (wParam, lParam);
+}
+
+@Override
+LRESULT WM_SIZE (long wParam, long lParam) {
+ if (ignoreResize) return null;
+ return super.WM_SIZE (wParam, lParam);
+}
+
+@Override
+LRESULT wmScrollChild (long wParam, long lParam) {
+
+ /* Do nothing when scrolling is ending */
+ int code = OS.LOWORD (wParam);
+ switch (code) {
+ case OS.TB_ENDTRACK:
+ case OS.TB_THUMBPOSITION:
+ return null;
+ }
+
+ if (!ignoreSelection) {
+ Event event = new Event ();
+ /*
+ * This code is intentionally commented. The event
+ * detail field is not currently supported on all
+ * platforms.
+ */
+// switch (code) {
+// case OS.TB_TOP: event.detail = SWT.HOME; break;
+// case OS.TB_BOTTOM: event.detail = SWT.END; break;
+// case OS.TB_LINEDOWN: event.detail = SWT.ARROW_DOWN; break;
+// case OS.TB_LINEUP: event.detail = SWT.ARROW_UP; break;
+// case OS.TB_PAGEDOWN: event.detail = SWT.PAGE_DOWN; break;
+// case OS.TB_PAGEUP: event.detail = SWT.PAGE_UP; break;
+// }
+ /*
+ * Send the event because WM_HSCROLL and WM_VSCROLL
+ * are sent from a modal message loop in windows that
+ * is active when the user is scrolling.
+ */
+ sendSelectionEvent (SWT.Selection, event, true);
+ // widget could be disposed at this point
+ }
+ return null;
+}
+
+}
Code Review / simantics / platform.git / blobdiff