bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/Scrollable.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2008 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.swt.widgets;


 import org.eclipse.swt.internal.carbon.OS;
 import org.eclipse.swt.internal.carbon.CGRect;
 import org.eclipse.swt.internal.carbon.Rect;
 import org.eclipse.swt.internal.carbon.ControlKind;

 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;

 /**
  * This class is the abstract superclass of all classes which
  * represent controls that have standard scroll bars.
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>H_SCROLL, V_SCROLL</dd>
  * <dt><b>Events:</b>
  * <dd>(none)</dd>
  * </dl>
  * <p>
  * IMPORTANT: This class is intended to be subclassed <em>only</em>
  * within the SWT implementation.
  * </p>
  *
  * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
  */
 public abstract class Scrollable extends Control {
  	int scrolledHandle;
 	ScrollBar horizontalBar, verticalBar;

 Scrollable () {
 	/* Do nothing */
 }

 /**
  * 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#H_SCROLL
  * @see SWT#V_SCROLL
  * @see Widget#checkSubclass
  * @see Widget#getStyle
  */
 public Scrollable (Composite parent, int style) {
 	super (parent, style);
 }

 /**
  * Given a desired <em>client area</em> for the receiver
  * (as described by the arguments), returns the bounding
  * rectangle which would be required to produce that client
  * area.
  * <p>
  * In other words, it returns a rectangle such that, if the
  * receiver's bounds were set to that rectangle, the area
  * of the receiver which is capable of displaying data
  * (that is, not covered by the "trimmings") would be the
  * rectangle described by the arguments (relative to the
  * receiver's parent).
  * </p>
  *
  * @param x the desired x coordinate of the client area
  * @param y the desired y coordinate of the client area
  * @param width the desired width of the client area
  * @param height the desired height of the client area
  * @return the required bounds to produce the given client area
  *
  * @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 #getClientArea
  */
 public Rectangle computeTrim (int x, int y, int width, int height) {
 	checkWidget();
 	int [] outMetric = new int [1];
 	OS.GetThemeMetric (OS.kThemeMetricScrollBarWidth, outMetric);
 	if (horizontalBar != null) height += outMetric [0];
 	if (verticalBar != null) width += outMetric [0];
 	Rect inset = inset ();
 	x -= inset.left;
 	y -= inset.top;
 	width += inset.left + inset.right;
 	height += inset.top + inset.bottom;
 	return new Rectangle (x, y, width, height);
 }

 ScrollBar createScrollBar (int style) {
     return new ScrollBar (this, style);
 }

 ScrollBar createStandardBar (int style) {
 	int barHandle = findStandardBar (style);
 	if (barHandle == 0) return null;
 	ScrollBar bar = new ScrollBar ();
 	bar.parent = this;
 	bar.style = style;
 	bar.display = display;
 	bar.handle = barHandle;
 	bar.register ();
 	bar.hookEvents ();
 	return bar;
 }

 void createWidget () {
 	super.createWidget ();
 	if ((style & SWT.H_SCROLL) != 0) horizontalBar = createScrollBar (SWT.H_SCROLL);
 	if ((style & SWT.V_SCROLL) != 0) verticalBar = createScrollBar (SWT.V_SCROLL);
 }

 void deregister () {
 	super.deregister ();
 	if (scrolledHandle != 0) display.removeWidget (scrolledHandle);
 }

 void destroyScrollBar (ScrollBar bar) {
 	setScrollBarVisible (bar, false);
 	bar.destroyHandle ();
 }

 int findStandardBar (int style) {
 	int parentHandle = scrolledHandle != 0 ? scrolledHandle : handle;
 	short [] count = new short [1];
 	OS.CountSubControls (parentHandle, count);
 	if (count [0] == 0) return 0;
 	int barHandle = 0;
 	int [] outMetric = new int [1];
 	OS.GetThemeMetric (OS.kThemeMetricScrollBarWidth, outMetric);
 	int [] outControl = new int [1];
 	ControlKind kind = new ControlKind ();
 	int [] property = new int [1];
 	for (int i = 0; i < count [0]; i++) {
 		OS.GetIndexedSubControl (parentHandle, (short) (i + 1), outControl);
 		OS.GetControlKind (outControl [0], kind);
 		if (kind.kind == OS.kControlKindScrollBar) {
 			property [0] = 0;
 			OS.GetControlProperty (outControl [0], Display.SWT0, Display.SWT0, 4, null, property);
 			if (property [0] == 0) {
 				Point point = getControlSize (outControl [0]);
 				if ((style & SWT.H_SCROLL) != 0) {
 					if (point.y == outMetric [0]) barHandle = outControl [0];
 				} else {
 					if (point.x == outMetric [0]) barHandle = outControl [0];
 				}
 			}
 		}
 	}
 	return barHandle;
 }

 public int getBorderWidth () {
 	checkWidget();
 	if ((state & CANVAS) != 0 && hasBorder ()) {
 		int [] outMetric = new int [1];
 		OS.GetThemeMetric (OS.kThemeMetricEditTextFrameOutset, outMetric);
 		return outMetric [0];
 	}
 	return 0;
 }

 /**
  * Returns a rectangle which describes the area of the
  * receiver which is capable of displaying data (that is,
  * not covered by the "trimmings").
  *
  * @return the client area
  *
  * @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 #computeTrim
  */
 public Rectangle getClientArea () {
 	checkWidget();
 	Rect rect = new Rect ();
 	OS.GetControlBounds (handle, rect);
 	return new Rectangle (0, 0, rect.right - rect.left, rect.bottom - rect.top);
 }

 /**
  * Returns the receiver's horizontal scroll bar if it has
  * one, and null if it does not.
  *
  * @return the horizontal scroll bar (or null)
  *
  * @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 ScrollBar getHorizontalBar () {
 	checkWidget();
 	return horizontalBar;
 }

 /**
  * Returns the receiver's vertical scroll bar if it has
  * one, and null if it does not.
  *
  * @return the vertical scroll bar (or null)
  *
  * @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 ScrollBar getVerticalBar () {
 	checkWidget();
 	return verticalBar;
 }

 void hookEvents () {
 	super.hookEvents ();
 	if ((state & CANVAS) != 0 && scrolledHandle != 0) {
 		int controlProc = display.controlProc;
 		int [] mask = new int [] {
 			OS.kEventClassControl, OS.kEventControlDraw,
 		};
 		int controlTarget = OS.GetControlEventTarget (scrolledHandle);
 		OS.InstallEventHandler (controlTarget, controlProc, mask.length / 2, mask, scrolledHandle, null);
 	}
 }

 boolean hooksKeys () {
 	return hooks (SWT.KeyDown) || hooks (SWT.KeyUp) || hooks (SWT.Traverse);
 }

 Rect inset () {
 	if ((state & CANVAS) != 0) {
 		Rect rect = new Rect ();
 		int [] outMetric = new int [1];
 		if (drawFocusRing () && (style & SWT.NO_FOCUS) == 0 && hooksKeys ()) {
 			OS.GetThemeMetric (OS.kThemeMetricFocusRectOutset, outMetric);
 			rect.left += outMetric [0];
 			rect.top += outMetric [0];
 			rect.right += outMetric [0];
 			rect.bottom += outMetric [0];
 		}
 		if (hasBorder ()) {
 			OS.GetThemeMetric (OS.kThemeMetricEditTextFrameOutset, outMetric);
 			rect.left += outMetric [0];
 			rect.top += outMetric [0];
 			rect.right += outMetric [0];
 			rect.bottom += outMetric [0];
 		}
 		return rect;
 	}
 	return EMPTY_RECT;
 }

 boolean isTrimHandle (int trimHandle) {
 	if (horizontalBar != null && horizontalBar.handle == trimHandle) return true;
 	if (verticalBar != null && verticalBar.handle == trimHandle) return true;
 	return trimHandle == scrolledHandle;
 }

 int kEventMouseWheelMoved (int nextHandler, int theEvent, int userData) {
 	int vPosition = verticalBar == null ? 0 : verticalBar.getSelection ();
 	int hPosition = horizontalBar == null ? 0 : horizontalBar.getSelection ();
 	int result = super.kEventMouseWheelMoved (nextHandler, theEvent, userData);
 	boolean redraw = false;
 	if (verticalBar != null) {
 		int position = verticalBar.getSelection ();
 		if (position != vPosition) {
 			Event event = new Event ();
 			event.detail = position < vPosition ? SWT.PAGE_UP : SWT.PAGE_DOWN;
 			verticalBar.sendEvent (SWT.Selection, event);
 			redraw = true;
 		}
 	}
 	if (horizontalBar != null) {
 		int position = horizontalBar.getSelection ();
 		if (position != hPosition) {
 			Event event = new Event ();
 			event.detail = position < hPosition ? SWT.PAGE_UP : SWT.PAGE_DOWN;
 			horizontalBar.sendEvent (SWT.Selection, event);
 			redraw = true;
 		}
 	}
 	if (redraw) redrawBackgroundImage ();
 	return result;
 }

 void redrawBackgroundImage () {
 	if (scrolledHandle == 0) {
 		Control control = findBackgroundControl();
 		if (control != null && control.backgroundImage != null) {
 			redrawWidget (handle, false);
 		}
 	}
 }

 void register () {
 	super.register ();
 	if (scrolledHandle != 0) display.addWidget (scrolledHandle, this);
 }

 void releaseHandle () {
 	super.releaseHandle ();
 	scrolledHandle = 0;
 }

 void releaseChildren (boolean destroy) {
 	if (horizontalBar != null) {
 		horizontalBar.release (false);
 		horizontalBar = null;
 	}
 	if (verticalBar != null) {
 		verticalBar.release (false);
 		verticalBar = null;
 	}
 	super.releaseChildren (destroy);
 }

 void resetVisibleRegion (int control) {
 	if (verticalBar != null) verticalBar.resetVisibleRegion (control);
 	if (horizontalBar != null) horizontalBar.resetVisibleRegion (control);
 	super.resetVisibleRegion (control);
 }

 void resizeClientArea () {
 	if (scrolledHandle == 0) return;
 	if ((state & CANVAS) == 0) return;
 	int vWidth = 0, hHeight = 0;
 	int [] outMetric = new int [1];
 	OS.GetThemeMetric (OS.kThemeMetricScrollBarWidth, outMetric);
 	boolean isVisibleHBar = horizontalBar != null && horizontalBar.getVisible ();
 	boolean isVisibleVBar = verticalBar != null && verticalBar.getVisible ();
 	if (isVisibleHBar) hHeight = outMetric [0];
 	if (isVisibleVBar) vWidth = outMetric [0];
 	int width, height;
 	CGRect rect = new CGRect ();
 	OS.HIViewGetBounds (scrolledHandle, rect);
 	width = (int) rect.width;
 	height = (int) rect.height;
 	Rect inset = inset ();
 	width = Math.max (0, width - vWidth - inset.left - inset.right);
 	height = Math.max (0, height - hHeight - inset.top - inset.bottom);
 	setBounds (handle, inset.left, inset.top, width, height, true, true, false);
 	if (isVisibleHBar) {
 		setBounds (horizontalBar.handle, inset.left, inset.top + height, width, hHeight, true, true, false);
 	}
 	if (isVisibleVBar) {
 		setBounds (verticalBar.handle, inset.left + width, inset.top, vWidth, height, true, true, false);
 	}
 }

 boolean sendMouseWheel (short wheelAxis, int wheelDelta) {
 	if ((state & CANVAS) != 0) {
 		ScrollBar bar = wheelAxis == OS.kEventMouseWheelAxisX ? horizontalBar : verticalBar;
 		if (bar != null && bar.getEnabled ()) {
 			bar.setSelection (Math.max (0, bar.getSelection () - bar.getIncrement () * wheelDelta));
 			Event event = new Event ();
 		    event.detail = wheelDelta > 0 ? SWT.PAGE_UP : SWT.PAGE_DOWN;
 			bar.sendEvent (SWT.Selection, event);
 			return true;
 		}
 	}
 	return false;
 }

 int setBounds (int x, int y, int width, int height, boolean move, boolean resize, boolean events) {
 	int result = super.setBounds(x, y, width, height, move, resize, false);
 	if ((result & MOVED) != 0) {
 		if (events) sendEvent (SWT.Move);
 	}
 	if ((result & RESIZED) != 0) {
 		resizeClientArea ();
 		if (events) sendEvent (SWT.Resize);
 	}
 	return result;
 }

 boolean setScrollBarVisible (ScrollBar bar, boolean visible) {
 	if (scrolledHandle == 0) return false;
 	if ((state & CANVAS) == 0) return false;
 	resizeClientArea ();
 	setVisible (bar.handle, visible);
 	return true;
 }

 void setZOrder () {
 	super.setZOrder ();
 	if (scrolledHandle != 0) OS.HIViewAddSubview (scrolledHandle, handle);
 }

 int topHandle () {
 	if (scrolledHandle != 0) return scrolledHandle;
 	return handle;
 }

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2008 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.swt.widgets;


	import org.eclipse.swt.internal.carbon.OS;
	import org.eclipse.swt.internal.carbon.CGRect;
	import org.eclipse.swt.internal.carbon.Rect;
	import org.eclipse.swt.internal.carbon.ControlKind;

	import org.eclipse.swt.*;
	import org.eclipse.swt.graphics.*;

	/**
	* This class is the abstract superclass of all classes which
	* represent controls that have standard scroll bars.
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>H_SCROLL, V_SCROLL</dd>
	* <dt><b>Events:</b>
	* <dd>(none)</dd>
	* </dl>
	* <p>
	* IMPORTANT: This class is intended to be subclassed <em>only</em>
	* within the SWT implementation.
	* </p>
	*
	* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
	*/
	public abstract class Scrollable extends Control {
	int scrolledHandle;
	ScrollBar horizontalBar, verticalBar;

	Scrollable () {
	/* Do nothing */
	}

	/**
	* 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#H_SCROLL
	* @see SWT#V_SCROLL
	* @see Widget#checkSubclass
	* @see Widget#getStyle
	*/
	public Scrollable (Composite parent, int style) {
	super (parent, style);
	}

	/**
	* Given a desired <em>client area</em> for the receiver
	* (as described by the arguments), returns the bounding
	* rectangle which would be required to produce that client
	* area.
	* <p>
	* In other words, it returns a rectangle such that, if the
	* receiver's bounds were set to that rectangle, the area
	* of the receiver which is capable of displaying data
	* (that is, not covered by the "trimmings") would be the
	* rectangle described by the arguments (relative to the
	* receiver's parent).
	* </p>
	*
	* @param x the desired x coordinate of the client area
	* @param y the desired y coordinate of the client area
	* @param width the desired width of the client area
	* @param height the desired height of the client area
	* @return the required bounds to produce the given client area
	*
	* @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 #getClientArea
	*/
	public Rectangle computeTrim (int x, int y, int width, int height) {
	checkWidget();
	int [] outMetric = new int [1];
	OS.GetThemeMetric (OS.kThemeMetricScrollBarWidth, outMetric);
	if (horizontalBar != null) height += outMetric [0];
	if (verticalBar != null) width += outMetric [0];
	Rect inset = inset ();
	x -= inset.left;
	y -= inset.top;
	width += inset.left + inset.right;
	height += inset.top + inset.bottom;
	return new Rectangle (x, y, width, height);
	}

	ScrollBar createScrollBar (int style) {
	return new ScrollBar (this, style);
	}

	ScrollBar createStandardBar (int style) {
	int barHandle = findStandardBar (style);
	if (barHandle == 0) return null;
	ScrollBar bar = new ScrollBar ();
	bar.parent = this;
	bar.style = style;
	bar.display = display;
	bar.handle = barHandle;
	bar.register ();
	bar.hookEvents ();
	return bar;
	}

	void createWidget () {
	super.createWidget ();
	if ((style & SWT.H_SCROLL) != 0) horizontalBar = createScrollBar (SWT.H_SCROLL);
	if ((style & SWT.V_SCROLL) != 0) verticalBar = createScrollBar (SWT.V_SCROLL);
	}

	void deregister () {
	super.deregister ();
	if (scrolledHandle != 0) display.removeWidget (scrolledHandle);
	}

	void destroyScrollBar (ScrollBar bar) {
	setScrollBarVisible (bar, false);
	bar.destroyHandle ();
	}

	int findStandardBar (int style) {
	int parentHandle = scrolledHandle != 0 ? scrolledHandle : handle;
	short [] count = new short [1];
	OS.CountSubControls (parentHandle, count);
	if (count [0] == 0) return 0;
	int barHandle = 0;
	int [] outMetric = new int [1];
	OS.GetThemeMetric (OS.kThemeMetricScrollBarWidth, outMetric);
	int [] outControl = new int [1];
	ControlKind kind = new ControlKind ();
	int [] property = new int [1];
	for (int i = 0; i < count [0]; i++) {
	OS.GetIndexedSubControl (parentHandle, (short) (i + 1), outControl);
	OS.GetControlKind (outControl [0], kind);
	if (kind.kind == OS.kControlKindScrollBar) {
	property [0] = 0;
	OS.GetControlProperty (outControl [0], Display.SWT0, Display.SWT0, 4, null, property);
	if (property [0] == 0) {
	Point point = getControlSize (outControl [0]);
	if ((style & SWT.H_SCROLL) != 0) {
	if (point.y == outMetric [0]) barHandle = outControl [0];
	} else {
	if (point.x == outMetric [0]) barHandle = outControl [0];
	}
	}
	}
	}
	return barHandle;
	}

	public int getBorderWidth () {
	checkWidget();
	if ((state & CANVAS) != 0 && hasBorder ()) {
	int [] outMetric = new int [1];
	OS.GetThemeMetric (OS.kThemeMetricEditTextFrameOutset, outMetric);
	return outMetric [0];
	}
	return 0;
	}

	/**
	* Returns a rectangle which describes the area of the
	* receiver which is capable of displaying data (that is,
	* not covered by the "trimmings").
	*
	* @return the client area
	*
	* @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 #computeTrim
	*/
	public Rectangle getClientArea () {
	checkWidget();
	Rect rect = new Rect ();
	OS.GetControlBounds (handle, rect);
	return new Rectangle (0, 0, rect.right - rect.left, rect.bottom - rect.top);
	}

	/**
	* Returns the receiver's horizontal scroll bar if it has
	* one, and null if it does not.
	*
	* @return the horizontal scroll bar (or null)
	*
	* @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 ScrollBar getHorizontalBar () {
	checkWidget();
	return horizontalBar;
	}

	/**
	* Returns the receiver's vertical scroll bar if it has
	* one, and null if it does not.
	*
	* @return the vertical scroll bar (or null)
	*
	* @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 ScrollBar getVerticalBar () {
	checkWidget();
	return verticalBar;
	}

	void hookEvents () {
	super.hookEvents ();
	if ((state & CANVAS) != 0 && scrolledHandle != 0) {
	int controlProc = display.controlProc;
	int [] mask = new int [] {
	OS.kEventClassControl, OS.kEventControlDraw,
	};
	int controlTarget = OS.GetControlEventTarget (scrolledHandle);
	OS.InstallEventHandler (controlTarget, controlProc, mask.length / 2, mask, scrolledHandle, null);
	}
	}

	boolean hooksKeys () {
	return hooks (SWT.KeyDown) \|\| hooks (SWT.KeyUp) \|\| hooks (SWT.Traverse);
	}

	Rect inset () {
	if ((state & CANVAS) != 0) {
	Rect rect = new Rect ();
	int [] outMetric = new int [1];
	if (drawFocusRing () && (style & SWT.NO_FOCUS) == 0 && hooksKeys ()) {
	OS.GetThemeMetric (OS.kThemeMetricFocusRectOutset, outMetric);
	rect.left += outMetric [0];
	rect.top += outMetric [0];
	rect.right += outMetric [0];
	rect.bottom += outMetric [0];
	}
	if (hasBorder ()) {
	OS.GetThemeMetric (OS.kThemeMetricEditTextFrameOutset, outMetric);
	rect.left += outMetric [0];
	rect.top += outMetric [0];
	rect.right += outMetric [0];
	rect.bottom += outMetric [0];
	}
	return rect;
	}
	return EMPTY_RECT;
	}

	boolean isTrimHandle (int trimHandle) {
	if (horizontalBar != null && horizontalBar.handle == trimHandle) return true;
	if (verticalBar != null && verticalBar.handle == trimHandle) return true;
	return trimHandle == scrolledHandle;
	}

	int kEventMouseWheelMoved (int nextHandler, int theEvent, int userData) {
	int vPosition = verticalBar == null ? 0 : verticalBar.getSelection ();
	int hPosition = horizontalBar == null ? 0 : horizontalBar.getSelection ();
	int result = super.kEventMouseWheelMoved (nextHandler, theEvent, userData);
	boolean redraw = false;
	if (verticalBar != null) {
	int position = verticalBar.getSelection ();
	if (position != vPosition) {
	Event event = new Event ();
	event.detail = position < vPosition ? SWT.PAGE_UP : SWT.PAGE_DOWN;
	verticalBar.sendEvent (SWT.Selection, event);
	redraw = true;
	}
	}
	if (horizontalBar != null) {
	int position = horizontalBar.getSelection ();
	if (position != hPosition) {
	Event event = new Event ();
	event.detail = position < hPosition ? SWT.PAGE_UP : SWT.PAGE_DOWN;
	horizontalBar.sendEvent (SWT.Selection, event);
	redraw = true;
	}
	}
	if (redraw) redrawBackgroundImage ();
	return result;
	}

	void redrawBackgroundImage () {
	if (scrolledHandle == 0) {
	Control control = findBackgroundControl();
	if (control != null && control.backgroundImage != null) {
	redrawWidget (handle, false);
	}
	}
	}

	void register () {
	super.register ();
	if (scrolledHandle != 0) display.addWidget (scrolledHandle, this);
	}

	void releaseHandle () {
	super.releaseHandle ();
	scrolledHandle = 0;
	}

	void releaseChildren (boolean destroy) {
	if (horizontalBar != null) {
	horizontalBar.release (false);
	horizontalBar = null;
	}
	if (verticalBar != null) {
	verticalBar.release (false);
	verticalBar = null;
	}
	super.releaseChildren (destroy);
	}

	void resetVisibleRegion (int control) {
	if (verticalBar != null) verticalBar.resetVisibleRegion (control);
	if (horizontalBar != null) horizontalBar.resetVisibleRegion (control);
	super.resetVisibleRegion (control);
	}

	void resizeClientArea () {
	if (scrolledHandle == 0) return;
	if ((state & CANVAS) == 0) return;
	int vWidth = 0, hHeight = 0;
	int [] outMetric = new int [1];
	OS.GetThemeMetric (OS.kThemeMetricScrollBarWidth, outMetric);
	boolean isVisibleHBar = horizontalBar != null && horizontalBar.getVisible ();
	boolean isVisibleVBar = verticalBar != null && verticalBar.getVisible ();
	if (isVisibleHBar) hHeight = outMetric [0];
	if (isVisibleVBar) vWidth = outMetric [0];
	int width, height;
	CGRect rect = new CGRect ();
	OS.HIViewGetBounds (scrolledHandle, rect);
	width = (int) rect.width;
	height = (int) rect.height;
	Rect inset = inset ();
	width = Math.max (0, width - vWidth - inset.left - inset.right);
	height = Math.max (0, height - hHeight - inset.top - inset.bottom);
	setBounds (handle, inset.left, inset.top, width, height, true, true, false);
	if (isVisibleHBar) {
	setBounds (horizontalBar.handle, inset.left, inset.top + height, width, hHeight, true, true, false);
	}
	if (isVisibleVBar) {
	setBounds (verticalBar.handle, inset.left + width, inset.top, vWidth, height, true, true, false);
	}
	}

	boolean sendMouseWheel (short wheelAxis, int wheelDelta) {
	if ((state & CANVAS) != 0) {
	ScrollBar bar = wheelAxis == OS.kEventMouseWheelAxisX ? horizontalBar : verticalBar;
	if (bar != null && bar.getEnabled ()) {
	bar.setSelection (Math.max (0, bar.getSelection () - bar.getIncrement () * wheelDelta));
	Event event = new Event ();
	event.detail = wheelDelta > 0 ? SWT.PAGE_UP : SWT.PAGE_DOWN;
	bar.sendEvent (SWT.Selection, event);
	return true;
	}
	}
	return false;
	}

	int setBounds (int x, int y, int width, int height, boolean move, boolean resize, boolean events) {
	int result = super.setBounds(x, y, width, height, move, resize, false);
	if ((result & MOVED) != 0) {
	if (events) sendEvent (SWT.Move);
	}
	if ((result & RESIZED) != 0) {
	resizeClientArea ();
	if (events) sendEvent (SWT.Resize);
	}
	return result;
	}

	boolean setScrollBarVisible (ScrollBar bar, boolean visible) {
	if (scrolledHandle == 0) return false;
	if ((state & CANVAS) == 0) return false;
	resizeClientArea ();
	setVisible (bar.handle, visible);
	return true;
	}

	void setZOrder () {
	super.setZOrder ();
	if (scrolledHandle != 0) OS.HIViewAddSubview (scrolledHandle, handle);
	}

	int topHandle () {
	if (scrolledHandle != 0) return scrolledHandle;
	return handle;
	}

	}