--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2013 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 are selectable user interface
+ * objects that represent a range of positive, numeric values.
+ * <p>
+ * At any given moment, a given scroll bar will have a
+ * single 'selection' that is considered to be its
+ * value, which is constrained to be within the range of
+ * values the scroll bar represents (that is, between its
+ * <em>minimum</em> and <em>maximum</em> values).
+ * </p><p>
+ * Typically, scroll bars will be made up of five areas:</p>
+ * <ol>
+ * <li>an arrow button for decrementing the value</li>
+ * <li>a page decrement area for decrementing the value by a larger amount</li>
+ * <li>a <em>thumb</em> for modifying the value by mouse dragging</li>
+ * <li>a page increment area for incrementing the value by a larger amount</li>
+ * <li>an arrow button for incrementing the value</li>
+ * </ol>
+ * <p>
+ * Based on their style, scroll bars are either <code>HORIZONTAL</code>
+ * (which have a left facing button for decrementing the value and a
+ * right facing button for incrementing it) or <code>VERTICAL</code>
+ * (which have an upward facing button for decrementing the value
+ * and a downward facing buttons for incrementing it).
+ * </p><p>
+ * On some platforms, the size of the scroll bar's thumb can be
+ * varied relative to the magnitude of the range of values it
+ * represents (that is, relative to the difference between its
+ * maximum and minimum values). Typically, this is used to
+ * indicate some proportional value such as the ratio of the
+ * visible area of a document to the total amount of space that
+ * it would take to display it. SWT supports setting the thumb
+ * size even if the underlying platform does not, but in this
+ * case the appearance of the scroll bar will not change.
+ * </p><p>
+ * Scroll bars are created by specifying either <code>H_SCROLL</code>,
+ * <code>V_SCROLL</code> or both when creating a <code>Scrollable</code>.
+ * They are accessed from the <code>Scrollable</code> using
+ * <code>getHorizontalBar</code> and <code>getVerticalBar</code>.
+ * </p><p>
+ * Note: Scroll bars are not Controls. On some platforms, scroll bars
+ * that appear as part of some standard controls such as a text or list
+ * have no operating system resources and are not children of the control.
+ * For this reason, scroll bars are treated specially. To create a control
+ * that looks like a scroll bar but has operating system resources, use
+ * <code>Slider</code>.
+ * </p>
+ * <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 Slider
+ * @see Scrollable
+ * @see Scrollable#getHorizontalBar
+ * @see Scrollable#getVerticalBar
+ * @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 ScrollBar extends Widget {
+ Scrollable parent;
+ int increment, pageIncrement;
+
+/**
+ * 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
+ */
+ScrollBar (Scrollable parent, int style) {
+ super (parent, checkStyle (style));
+ this.parent = parent;
+ createWidget ();
+}
+
+/**
+ * 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>
+ * When <code>widgetSelected</code> is called, the event object detail field contains one of the following values:
+ * <code>SWT.NONE</code> - for the end of a drag.
+ * <code>SWT.DRAG</code>.
+ * <code>SWT.HOME</code>.
+ * <code>SWT.END</code>.
+ * <code>SWT.ARROW_DOWN</code>.
+ * <code>SWT.ARROW_UP</code>.
+ * <code>SWT.PAGE_DOWN</code>.
+ * <code>SWT.PAGE_UP</code>.
+ * <code>widgetDefaultSelected</code> is not called.
+ * </p>
+ *
+ * @param listener the listener which should be notified when the user changes the receiver's value
+ *
+ * @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
+ * @see SelectionEvent
+ */
+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);
+}
+
+static int checkStyle (int style) {
+ return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
+}
+
+void createWidget () {
+ increment = 1;
+ pageIncrement = 10;
+ /*
+ * Do not set the initial values of the maximum
+ * or the thumb. These values normally default
+ * to 100 and 10 but may have been set already
+ * by the widget that owns the scroll bar. For
+ * example, a scroll bar that is created for a
+ * list widget, setting these defaults would
+ * override the initial values provided by the
+ * list widget.
+ */
+}
+
+@Override
+void destroyWidget () {
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ OS.ShowScrollBar (hwnd, type, false);
+ parent.destroyScrollBar (style);
+ releaseHandle ();
+ //This code is intentionally commented
+ //parent.sendEvent (SWT.Resize);
+}
+
+Rectangle getBounds () {
+// checkWidget ();
+ parent.forceResize ();
+ RECT rect = new RECT ();
+ OS.GetClientRect (parent.scrolledHandle (), rect);
+ int x = 0, y = 0, width, height;
+ if ((style & SWT.HORIZONTAL) != 0) {
+ y = rect.bottom - rect.top;
+ width = rect.right - rect.left;
+ height = OS.GetSystemMetrics (OS.SM_CYHSCROLL);
+ } else {
+ x = rect.right - rect.left;
+ width = OS.GetSystemMetrics (OS.SM_CXVSCROLL);
+ height = rect.bottom - rect.top;
+ }
+ return new Rectangle (x, y, width, height);
+}
+
+/**
+ * Returns <code>true</code> if the receiver is enabled, and
+ * <code>false</code> otherwise. A disabled control is typically
+ * not selectable from the user interface and draws with an
+ * inactive or "grayed" look.
+ *
+ * @return the receiver's enabled 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>
+ *
+ * @see #isEnabled
+ */
+public boolean getEnabled () {
+ checkWidget();
+ return (state & DISABLED) == 0;
+}
+
+/**
+ * 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 increment;
+}
+
+/**
+ * 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();
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ info.fMask = OS.SIF_RANGE;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ OS.GetScrollInfo (hwnd, type, info);
+ return info.nMax;
+}
+
+/**
+ * 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();
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ info.fMask = OS.SIF_RANGE;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ OS.GetScrollInfo (hwnd, type, info);
+ return info.nMin;
+}
+
+/**
+ * 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 pageIncrement;
+}
+
+/**
+ * Returns the receiver's parent, which must be a Scrollable.
+ *
+ * @return the receiver's parent
+ *
+ * @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 Scrollable getParent () {
+ checkWidget();
+ return parent;
+}
+
+/**
+ * Returns the single 'selection' that is the receiver's value.
+ *
+ * @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();
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ info.fMask = OS.SIF_POS;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ OS.GetScrollInfo (hwnd, type, info);
+ return info.nPos;
+}
+
+/**
+ * Returns a point describing the receiver's size. The
+ * x coordinate of the result is the width of the receiver.
+ * The y coordinate of the result is the 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>
+ */
+public Point getSize () {
+ checkWidget();
+ return DPIUtil.autoScaleDown(getSizeInPixels());
+}
+
+Point getSizeInPixels () {
+ parent.forceResize ();
+ RECT rect = new RECT ();
+ OS.GetClientRect (parent.scrolledHandle (), rect);
+ int width, height;
+ if ((style & SWT.HORIZONTAL) != 0) {
+ width = rect.right - rect.left;
+ height = OS.GetSystemMetrics (OS.SM_CYHSCROLL);
+ } else {
+ width = OS.GetSystemMetrics (OS.SM_CXVSCROLL);
+ height = rect.bottom - rect.top;
+ }
+ return new Point (width, height);
+}
+
+/**
+ * Returns the receiver's thumb value.
+ *
+ * @return the thumb 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>
+ *
+ * @see ScrollBar
+ */
+public int getThumb () {
+ checkWidget();
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ info.fMask = OS.SIF_PAGE;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ OS.GetScrollInfo (hwnd, type, info);
+ if (info.nPage != 0) --info.nPage;
+ return info.nPage;
+}
+
+/**
+ * Returns a rectangle describing the size and location of the
+ * receiver's thumb relative to its parent.
+ *
+ * @return the thumb bounds, relative to the {@link #getParent() parent}
+ *
+ * @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 3.6
+ */
+public Rectangle getThumbBounds () {
+ checkWidget();
+ return DPIUtil.autoScaleDown(getThumbBoundsInPixels());
+}
+
+Rectangle getThumbBoundsInPixels () {
+ parent.forceResize ();
+ SCROLLBARINFO info = new SCROLLBARINFO();
+ info.cbSize = SCROLLBARINFO.sizeof;
+ int x, y, width, height;
+ if ((style & SWT.HORIZONTAL) != 0) {
+ OS.GetScrollBarInfo(parent.handle, OS.OBJID_HSCROLL, info);
+ x = info.rcScrollBar.left + info.xyThumbTop;
+ y = info.rcScrollBar.top;
+ width = info.xyThumbBottom - info.xyThumbTop;
+ height = info.rcScrollBar.bottom - info.rcScrollBar.top;
+ } else {
+ OS.GetScrollBarInfo(parent.handle, OS.OBJID_VSCROLL, info);
+ x = info.rcScrollBar.left;
+ y = info.rcScrollBar.top + info.xyThumbTop;
+ width = info.rcScrollBar.right - info.rcScrollBar.left;
+ height = info.xyThumbBottom - info.xyThumbTop;
+ }
+ RECT rect = new RECT ();
+ rect.left = x;
+ rect.top = y;
+ rect.right = x + width;
+ rect.bottom = y + height;
+ OS.MapWindowPoints (0, parent.handle, rect, 2);
+ return new Rectangle(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
+}
+
+/**
+ * Returns a rectangle describing the size and location of the
+ * receiver's thumb track relative to its parent. This rectangle
+ * comprises the areas 2, 3, and 4 as described in {@link ScrollBar}.
+ *
+ * @return the thumb track bounds, relative to the {@link #getParent() parent}
+ *
+ * @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 3.6
+ */
+public Rectangle getThumbTrackBounds () {
+ checkWidget();
+ return DPIUtil.autoScaleDown(getThumbTrackBoundsInPixels());
+}
+
+Rectangle getThumbTrackBoundsInPixels () {
+ parent.forceResize ();
+ SCROLLBARINFO info = new SCROLLBARINFO();
+ info.cbSize = SCROLLBARINFO.sizeof;
+ int x = 0, y = 0, width, height;
+ if ((style & SWT.HORIZONTAL) != 0) {
+ OS.GetScrollBarInfo(parent.handle, OS.OBJID_HSCROLL, info);
+ int size = OS.GetSystemMetrics (OS.SM_CYHSCROLL);
+ y = info.rcScrollBar.top;
+ width = info.rcScrollBar.right - info.rcScrollBar.left;
+ height = size;
+ if (width <= 2 * size) {
+ x = info.rcScrollBar.left + width / 2;
+ width = 0;
+ } else {
+ x = info.rcScrollBar.left + size;
+ width -= 2 * size;
+ }
+ } else {
+ OS.GetScrollBarInfo(parent.handle, OS.OBJID_VSCROLL, info);
+ int size = OS.GetSystemMetrics (OS.SM_CYVSCROLL);
+ x = info.rcScrollBar.left;
+ width = size;
+ height = info.rcScrollBar.bottom - info.rcScrollBar.top;
+ if (height <= 2 * size) {
+ y = info.rcScrollBar.top + height / 2;
+ height = 0;
+ } else {
+ y = info.rcScrollBar.top + size;
+ height -= 2 * size;
+ }
+ }
+ RECT rect = new RECT ();
+ rect.left = x;
+ rect.top = y;
+ rect.right = x + width;
+ rect.bottom = y + height;
+ OS.MapWindowPoints (0, parent.handle, rect, 2);
+ return new Rectangle(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
+}
+
+/**
+ * Returns <code>true</code> if the receiver is visible, and
+ * <code>false</code> otherwise.
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, this method
+ * may still indicate that it is considered visible even though
+ * it may not actually be showing.
+ * </p>
+ *
+ * @return the receiver's visibility 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>
+ */
+public boolean getVisible () {
+ checkWidget();
+ SCROLLBARINFO psbi = new SCROLLBARINFO ();
+ psbi.cbSize = SCROLLBARINFO.sizeof;
+ int idObject = (style & SWT.VERTICAL) != 0 ? OS.OBJID_VSCROLL : OS.OBJID_HSCROLL;
+ OS.GetScrollBarInfo (hwndScrollBar (), idObject, psbi);
+ return (psbi.rgstate [0] & OS.STATE_SYSTEM_INVISIBLE) == 0;
+}
+
+long hwndScrollBar () {
+ return parent.scrolledHandle ();
+}
+
+/**
+ * Returns <code>true</code> if the receiver is enabled and all
+ * of the receiver's ancestors are enabled, and <code>false</code>
+ * otherwise. A disabled control is typically not selectable from the
+ * user interface and draws with an inactive or "grayed" look.
+ *
+ * @return the receiver's enabled 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>
+ *
+ * @see #getEnabled
+ */
+public boolean isEnabled () {
+ checkWidget();
+ return getEnabled () && parent.isEnabled ();
+}
+
+/**
+ * Returns <code>true</code> if the receiver is visible and all
+ * of the receiver's ancestors are visible and <code>false</code>
+ * otherwise.
+ *
+ * @return the receiver's visibility 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>
+ *
+ * @see #getVisible
+ */
+public boolean isVisible () {
+ checkWidget();
+ return getVisible () && parent.isVisible ();
+}
+
+@Override
+void releaseHandle () {
+ super.releaseHandle ();
+ parent = null;
+}
+
+@Override
+void releaseParent () {
+ super.releaseParent ();
+ if (parent.horizontalBar == this) parent.horizontalBar = null;
+ if (parent.verticalBar == this) parent.verticalBar = null;
+}
+
+/**
+ * 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);
+}
+
+int scrollBarType () {
+ return (style & SWT.VERTICAL) != 0 ? OS.SB_VERT : OS.SB_HORZ;
+}
+
+/**
+ * Enables the receiver if the argument is <code>true</code>,
+ * and disables it otherwise. A disabled control is typically
+ * not selectable from the user interface and draws with an
+ * inactive or "grayed" look.
+ *
+ * @param enabled the new enabled 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>
+ */
+public void setEnabled (boolean enabled) {
+ checkWidget();
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ int flags = enabled ? OS.ESB_ENABLE_BOTH : OS.ESB_DISABLE_BOTH;
+ OS.EnableScrollBar (hwnd, type, flags);
+ if (enabled) {
+ state &= ~DISABLED;
+ } else {
+ state |= DISABLED;
+ }
+}
+
+/**
+ * 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 value 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 value) {
+ checkWidget();
+ if (value < 1) return;
+ increment = value;
+}
+
+/**
+ * Sets the maximum. If this value is negative or less than or
+ * equal to the minimum, the value is ignored. If necessary, first
+ * the thumb and then the selection are adjusted to fit within the
+ * new range.
+ *
+ * @param value the new 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 setMaximum (int value) {
+ checkWidget();
+ if (value < 0) return;
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ info.fMask = OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL;
+ OS.GetScrollInfo (hwnd, type, info);
+ if (value - info.nMin - info.nPage < 1) return;
+ info.nMax = value;
+ SetScrollInfo (hwnd, type, info, true);
+}
+
+/**
+ * Sets the minimum value. If this value is negative or greater
+ * than or equal to the maximum, the value is ignored. If necessary,
+ * first the thumb and then the selection are adjusted to fit within
+ * the new range.
+ *
+ * @param value the new 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 setMinimum (int value) {
+ checkWidget();
+ if (value < 0) return;
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ info.fMask = OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL;
+ OS.GetScrollInfo (hwnd, type, info);
+ if (info.nMax - value - info.nPage < 1) return;
+ info.nMin = value;
+ SetScrollInfo (hwnd, type, info, true);
+}
+
+/**
+ * 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 value 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 value) {
+ checkWidget();
+ if (value < 1) return;
+ pageIncrement = value;
+}
+
+boolean SetScrollInfo (long hwnd, int flags, SCROLLINFO info, boolean fRedraw) {
+ /*
+ * Bug in Windows. For some reason, when SetScrollInfo()
+ * is used with SIF_POS and the scroll bar is hidden,
+ * the opposite scroll bar is incorrectly made visible
+ * so that the next time the parent is resized (or another
+ * scroll bar operation is performed), the opposite scroll
+ * bar draws. The fix is to hide both scroll bars.
+ */
+ boolean barVisible = false;
+ boolean visible = getVisible ();
+
+ ScrollBar bar = null;
+ switch (flags) {
+ case OS.SB_HORZ:
+ bar = parent.getVerticalBar ();
+ break;
+ case OS.SB_VERT:
+ bar = parent.getHorizontalBar ();
+ break;
+ }
+ barVisible = bar != null && bar.getVisible ();
+ if (!visible || (state & DISABLED) != 0) fRedraw = false;
+ boolean result = OS.SetScrollInfo (hwnd, flags, info, fRedraw);
+
+ /*
+ * Bug in Windows. For some reason, when the widget
+ * is a standard scroll bar, and SetScrollInfo() is
+ * called with SIF_RANGE or SIF_PAGE, the widget is
+ * incorrectly made visible so that the next time the
+ * parent is resized (or another scroll bar operation
+ * is performed), the scroll bar draws. The fix is
+ * to hide the scroll bar (again) when already hidden.
+ */
+ if (!visible) {
+ OS.ShowScrollBar (hwnd, !barVisible ? OS.SB_BOTH : flags, false);
+ }
+
+ /*
+ * Bug in Windows. When only one scroll bar is visible,
+ * and the thumb changes using SIF_RANGE or SIF_PAGE
+ * from being visible to hidden, the opposite scroll
+ * bar is incorrectly made visible. The next time the
+ * parent is resized (or another scroll bar operation
+ * is performed), the opposite scroll bar draws. The
+ * fix is to hide the opposite scroll bar again.
+ *
+ * NOTE: This problem only happens on Vista
+ */
+ if (visible && bar != null && !barVisible) {
+ OS.ShowScrollBar (hwnd, flags == OS.SB_HORZ ? OS.SB_VERT : OS.SB_HORZ, false);
+ }
+
+ /*
+ * Feature in Windows. Using SIF_DISABLENOSCROLL,
+ * SetScrollInfo () can change enabled and disabled
+ * state of the scroll bar causing a scroll bar that
+ * was disabled by the application to become enabled.
+ * The fix is to disable the scroll bar (again) when
+ * the application has disabled the scroll bar.
+ */
+ if ((state & DISABLED) != 0) {
+ OS.EnableScrollBar (hwnd, flags, OS.ESB_DISABLE_BOTH);
+ }
+ return result;
+}
+
+/**
+ * Sets the single <em>selection</em> that is the receiver's
+ * value to the argument which must be greater than or equal
+ * to zero.
+ *
+ * @param selection 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 selection) {
+ checkWidget();
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ info.fMask = OS.SIF_POS;
+ info.nPos = selection;
+ SetScrollInfo (hwnd, type, info, true);
+}
+
+/**
+ * Sets the thumb value. The thumb value should be used to represent
+ * the size of the visual portion of the current range. This value is
+ * usually the same as the page increment value.
+ * <p>
+ * This new value will be ignored if it is less than one, and will be
+ * clamped if it exceeds the receiver's current range.
+ * </p>
+ *
+ * @param value the new thumb value, which must be at least one and not
+ * larger than the size of the current range
+ *
+ * @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 setThumb (int value) {
+ checkWidget();
+ if (value < 1) return;
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ info.fMask = OS.SIF_PAGE | OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL;
+ OS.GetScrollInfo (hwnd, type, info);
+ info.nPage = value;
+ if (info.nPage != 0) info.nPage++;
+ SetScrollInfo (hwnd, type, info, true);
+}
+
+/**
+ * Sets the receiver's selection, minimum value, maximum
+ * value, thumb, increment and page increment all at once.
+ * <p>
+ * Note: This is similar to setting the values individually
+ * using the appropriate methods, but may be implemented in a
+ * more efficient fashion on some platforms.
+ * </p>
+ *
+ * @param selection the new selection value
+ * @param minimum the new minimum value
+ * @param maximum the new maximum value
+ * @param thumb the new thumb value
+ * @param increment the new increment value
+ * @param pageIncrement the new pageIncrement 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>
+ */
+public void setValues (int selection, int minimum, int maximum, int thumb, int increment, int pageIncrement) {
+ checkWidget();
+ if (minimum < 0) return;
+ if (maximum < 0) return;
+ if (thumb < 1) return;
+ if (increment < 1) return;
+ if (pageIncrement < 1) return;
+ this.increment = increment;
+ this.pageIncrement = pageIncrement;
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ info.fMask = OS.SIF_POS | OS.SIF_PAGE | OS.SIF_RANGE | OS.SIF_DISABLENOSCROLL;
+ info.nPos = selection;
+ info.nMin = minimum;
+ info.nMax = maximum;
+ info.nPage = thumb;
+ if (info.nPage != 0) info.nPage++;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ SetScrollInfo (hwnd, type, info, true);
+}
+
+/**
+ * Marks the receiver as visible if the argument is <code>true</code>,
+ * and marks it invisible otherwise.
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, marking
+ * it visible may not actually cause it to be displayed.
+ * </p>
+ *
+ * @param visible the new visibility 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>
+ */
+public void setVisible (boolean visible) {
+ checkWidget();
+ if (visible == getVisible ()) return;
+ /*
+ * Set the state bits before calling ShowScrollBar ()
+ * because hiding and showing the scroll bar can cause
+ * WM_SIZE messages when the client area is resized.
+ * Setting the state before the call means that code
+ * that runs during WM_SIZE that queries the visibility
+ * of the scroll bar will get the correct value.
+ */
+ state = visible ? state & ~HIDDEN : state | HIDDEN;
+ long hwnd = hwndScrollBar ();
+ int type = scrollBarType ();
+ /*
+ * Bug in Windows 7. Windows will cause pixel corruption
+ * when there is only one scroll bar visible and it is
+ * hidden. The fix is to temporarily show the other scroll
+ * bar and hide both.
+ */
+ if (!visible) {
+ if (OS.IsAppThemed ()) {
+ SCROLLBARINFO psbi = new SCROLLBARINFO ();
+ psbi.cbSize = SCROLLBARINFO.sizeof;
+ int idObject = (style & SWT.VERTICAL) != 0 ? OS.OBJID_HSCROLL : OS.OBJID_VSCROLL;
+ OS.GetScrollBarInfo (hwnd, idObject, psbi);
+ if ((psbi.rgstate [0] & OS.STATE_SYSTEM_INVISIBLE) != 0) {
+ OS.ShowScrollBar (hwnd, type == OS.SB_VERT ? OS.SB_HORZ : OS.SB_VERT, true);
+ type = OS.SB_BOTH;
+ }
+ }
+ }
+ if (OS.ShowScrollBar (hwnd, type, visible)) {
+ /*
+ * Bug in Windows. For some reason, when the widget
+ * is a standard scroll bar, and SetScrollInfo () is
+ * called with SIF_RANGE or SIF_PAGE while the widget
+ * is not visible, the widget is incorrectly disabled
+ * even though the values for SIF_RANGE and SIF_PAGE,
+ * when set for a visible scroll bar would not disable
+ * the scroll bar. The fix is to enable the scroll bar
+ * when not disabled by the application and the current
+ * scroll bar ranges would cause the scroll bar to be
+ * enabled had they been set when the scroll bar was
+ * visible.
+ */
+ if ((state & DISABLED) == 0) {
+ SCROLLINFO info = new SCROLLINFO ();
+ info.cbSize = SCROLLINFO.sizeof;
+ info.fMask = OS.SIF_RANGE | OS.SIF_PAGE;
+ OS.GetScrollInfo (hwnd, type, info);
+ if (info.nMax - info.nMin - info.nPage >= 0) {
+ OS.EnableScrollBar (hwnd, type, OS.ESB_ENABLE_BOTH);
+ }
+ }
+ sendEvent (visible ? SWT.Show : SWT.Hide);
+ // widget could be disposed at this point
+ }
+}
+
+LRESULT wmScrollChild (long wParam, long lParam) {
+
+ /* Do nothing when scrolling is ending */
+ int code = OS.LOWORD (wParam);
+ if (code == OS.SB_ENDSCROLL) return null;
+
+ /*
+ * 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.
+ */
+ Event event = new Event ();
+ switch (code) {
+ case OS.SB_THUMBPOSITION: event.detail = SWT.NONE; break;
+ case OS.SB_THUMBTRACK: event.detail = SWT.DRAG; break;
+ case OS.SB_TOP: event.detail = SWT.HOME; break;
+ case OS.SB_BOTTOM: event.detail = SWT.END; break;
+ case OS.SB_LINEDOWN: event.detail = SWT.ARROW_DOWN; break;
+ case OS.SB_LINEUP: event.detail = SWT.ARROW_UP; break;
+ case OS.SB_PAGEDOWN: event.detail = SWT.PAGE_DOWN; break;
+ case OS.SB_PAGEUP: event.detail = SWT.PAGE_UP; break;
+ }
+ sendSelectionEvent (SWT.Selection, event, true);
+ // the widget could be destroyed at this point
+ return null;
+}
+
+}
Code Review / simantics / platform.git / blobdiff