/******************************************************************************* * Copyright (c) 2000, 2003 IBM Corporation and others. * All rights reserved. This program and the accompanying materials  * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.widgets; import org.eclipse.swt.internal.win32.*;import org.eclipse.swt.*;import org.eclipse.swt.graphics.*;import org.eclipse.swt.events.*;/** * Instances of the receiver represent a selectable user interface object * that allows the user to drag a rubber banded outline of the sash within * the parent control. * <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 intended to be subclassed <em>only</em> * within the SWT implementation. * </p> */public class Sash extends Control {	boolean dragging;	int startX, startY, lastX, lastY;	final static int INCREMENT = 1;	final static int PAGE_INCREMENT = 9;/** * 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 Sash (Composite parent, int style) {	super (parent, checkStyle (style));}/** * Adds the listener to the collection of listeners who will * be notified when the control is selected, by sending * it one of the messages defined in the <code>SelectionListener</code> * interface. * <p> * When <code>widgetSelected</code> is called, the x, y, width, and height fields of the event object are valid. * If the reciever is being dragged, the event object detail field contains the value <code>SWT.DRAG</code>. * <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 * @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);}int callWindowProc (int msg, int wParam, int lParam) {	if (handle == 0) return 0;	return OS.DefWindowProc (handle, msg, wParam, lParam);}static int checkStyle (int style) {	return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);}public Point computeSize (int wHint, int hHint, boolean changed) {	checkWidget ();	int border = getBorderWidth ();	int width = border * 2, height = border * 2;	if ((style & SWT.HORIZONTAL) != 0) {		width += DEFAULT_WIDTH;  height += 3;	} else {		width += 3; height += DEFAULT_HEIGHT;	}	if (wHint != SWT.DEFAULT) width = wHint + (border * 2);	if (hHint != SWT.DEFAULT) height = hHint + (border * 2);	return new Point (width, height);}void drawBand (int x, int y, int width, int height) {	int hwndTrack = parent.handle;	byte [] bits = {-86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0};	int stippleBitmap = OS.CreateBitmap (8, 8, 1, 1, bits);	int stippleBrush = OS.CreatePatternBrush (stippleBitmap);	int hDC = OS.GetDCEx (hwndTrack, 0, OS.DCX_CACHE);	int oldBrush = OS.SelectObject (hDC, stippleBrush);	OS.PatBlt (hDC, x, y, width, height, OS.PATINVERT);	OS.SelectObject (hDC, oldBrush);	OS.ReleaseDC (hwndTrack, hDC);	OS.DeleteObject (stippleBrush);	OS.DeleteObject (stippleBitmap);}/** * Removes the listener from the collection of listeners who will * be notified when the control is selected. * * @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 #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);	}TCHAR windowClass () {	return display.windowClass;}int windowProc () {	return display.windowProc;}LRESULT WM_ERASEBKGND (int wParam, int lParam) {	LRESULT result = super.WM_ERASEBKGND (wParam, lParam);	if (result != null) return result;	drawBackground (wParam);	return LRESULT.ONE;}LRESULT WM_KEYDOWN (int wParam, int lParam) {	LRESULT result = super.WM_KEYDOWN (wParam, lParam);	if (result != null) return result;	switch (wParam) {		case OS.VK_LEFT:		case OS.VK_RIGHT:		case OS.VK_UP:		case OS.VK_DOWN:						/* Calculate the new x or y position */			if (OS.GetKeyState (OS.VK_LBUTTON) < 0) return result;			int step = OS.GetKeyState (OS.VK_CONTROL) < 0 ? INCREMENT : PAGE_INCREMENT;			POINT pt = new POINT ();			if ((style & SWT.VERTICAL) != 0) {				if (wParam == OS.VK_UP || wParam == OS.VK_DOWN) break;				pt.x = wParam == OS.VK_LEFT ? -step : step;			} else {				if (wParam == OS.VK_LEFT || wParam == OS.VK_RIGHT) break;				pt.y = wParam == OS.VK_UP ? -step : step;			}			int hwndTrack = parent.handle;			OS.MapWindowPoints (handle, hwndTrack, pt, 1);			RECT rect = new RECT (), clientRect = new RECT ();			OS.GetWindowRect (handle, rect);			int width = rect.right - rect.left;			int height = rect.bottom - rect.top;			OS.GetClientRect (hwndTrack, clientRect);			int clientWidth = clientRect.right - clientRect.left;			int clientHeight = clientRect.bottom - clientRect.top;			int newX = lastX, newY = lastY;			if ((style & SWT.VERTICAL) != 0) {				newX = Math.min (Math.max (0, pt.x - startX), clientWidth - width);			} else {				newY = Math.min (Math.max (0, pt.y - startY), clientHeight - height);			}			if (newX == lastX && newY == lastY) return result;			/* Update the pointer position */			POINT cursorPt = new POINT ();			cursorPt.x = pt.x;  cursorPt.y = pt.y;			OS.ClientToScreen (hwndTrack, cursorPt);			if ((style & SWT.VERTICAL) != 0) {				cursorPt.y += height / 2;			}			else {				cursorPt.x += width / 2;			}			OS.SetCursorPos (cursorPt.x, cursorPt.y);			/* The event must be sent because doit flag is used */			Event event = new Event ();			event.x = newX;  event.y = newY;			event.width = width;  event.height = height;						/*			* It is possible (but unlikely), that application			* code could have disposed the widget in the selection			* event.  If this happens, end the processing of the			* Windows message by returning zero as the result of			* the window proc.			*/			sendEvent (SWT.Selection, event);			if (isDisposed ()) return LRESULT.ZERO;			return result;	}	return result;}LRESULT WM_GETDLGCODE (int wParam, int lParam) {	return new LRESULT (OS.DLGC_STATIC);}LRESULT WM_LBUTTONDOWN (int wParam, int lParam) {	LRESULT result = super.WM_LBUTTONDOWN (wParam, lParam);	/* Compute the banding rectangle */	int hwndTrack = parent.handle;	POINT pt = new POINT ();	pt.x = (short) (lParam & 0xFFFF);	pt.y = (short) (lParam >> 16);	RECT rect = new RECT ();	OS.GetWindowRect (handle, rect);	OS.MapWindowPoints (handle, 0, pt, 1);	startX = pt.x - rect.left;	startY = pt.y - rect.top;	OS.MapWindowPoints (0, hwndTrack, rect, 2);	lastX = rect.left;	lastY = rect.top;	int width = rect.right - rect.left;	int height = rect.bottom - rect.top;	/* The event must be sent because doit flag is used */	Event event = new Event ();	event.x = lastX;	event.y = lastY;	event.width = width;	event.height = height;	event.detail = SWT.DRAG;		/*	* It is possible (but unlikely), that application	* code could have disposed the widget in the selection	* event.  If this happens, end the processing of the	* Windows message by returning zero as the result of	* the window proc.	*/	sendEvent (SWT.Selection, event);	if (isDisposed ()) return LRESULT.ZERO;		/* Draw the banding rectangle */	if (event.doit) {		dragging = true;		menuShell ().bringToTop ();		if (OS.IsWinCE) {			OS.UpdateWindow (hwndTrack);		} else {			int flags = OS.RDW_UPDATENOW | OS.RDW_ALLCHILDREN;			OS.RedrawWindow (hwndTrack, null, 0, flags);		}		drawBand (lastX = event.x, lastY = event.y, width, height);	}	return result;}LRESULT WM_LBUTTONUP (int wParam, int lParam) {	LRESULT result = super.WM_LBUTTONUP (wParam, lParam);	/* Compute the banding rectangle */	if (!dragging) return result;	dragging = false;	RECT rect = new RECT ();	OS.GetWindowRect (handle, rect);	int width = rect.right - rect.left;	int height = rect.bottom - rect.top;		/* The event must be sent because doit flag is used */	Event event = new Event ();	event.x = lastX;	event.y = lastY;	event.width = width;	event.height = height;	drawBand (lastX, lastY, width, height);	sendEvent (SWT.Selection, event);	// widget could be disposed at this point	return result;}LRESULT WM_MOUSEMOVE (int wParam, int lParam) {	LRESULT result = super.WM_MOUSEMOVE (wParam, lParam);	if (result != null) return result;	if (!dragging || (wParam & OS.MK_LBUTTON) == 0) return result;	/* Compute the banding rectangle */	POINT pt = new POINT ();	pt.x = (short) (lParam & 0xFFFF);	pt.y = (short) (lParam >> 16);	int hwndTrack = parent.handle;	OS.MapWindowPoints (handle, hwndTrack, pt, 1);	RECT rect = new RECT (), clientRect = new RECT ();	OS.GetWindowRect (handle, rect);	int width = rect.right - rect.left;	int height = rect.bottom - rect.top;	OS.GetClientRect (hwndTrack, clientRect);	int newX = lastX, newY = lastY;	if ((style & SWT.VERTICAL) != 0) {		int clientWidth = clientRect.right - clientRect.left;		newX = Math.min (Math.max (0, pt.x - startX), clientWidth - width);	} else {		int clientHeight = clientRect.bottom - clientRect.top;		newY = Math.min (Math.max (0, pt.y - startY), clientHeight - height);	}	if (newX == lastX && newY == lastY) return result;	drawBand (lastX, lastY, width, height);	/* The event must be sent because doit flag is used */	Event event = new Event ();	event.x = newX;	event.y = newY;	event.width = width;	event.height = height;	event.detail = SWT.DRAG;		/*	* It is possible (but unlikely), that application	* code could have disposed the widget in the selection	* event.  If this happens, end the processing of the	* Windows message by returning zero as the result of	* the window proc.	*/	sendEvent (SWT.Selection, event);	if (isDisposed ()) return LRESULT.ZERO;	/* Draw the banding rectangle */	if (event.doit) {		lastX = event.x; lastY = event.y;		if (OS.IsWinCE) {			OS.UpdateWindow (hwndTrack);		} else {			int flags = OS.RDW_UPDATENOW | OS.RDW_ALLCHILDREN;			OS.RedrawWindow (hwndTrack, null, 0, flags);		}		drawBand (lastX, lastY, width, height);	}	return result;}LRESULT WM_SETCURSOR (int wParam, int lParam) {	LRESULT result = super.WM_SETCURSOR (wParam, lParam);	if (result != null) return result;	int hitTest = lParam & 0xFFFF; 	if (hitTest == OS.HTCLIENT) {	 	int hCursor = 0;	 	if ((style & SWT.HORIZONTAL) != 0) {			hCursor = OS.LoadCursor (0, OS.IDC_SIZENS);	 	} else {			hCursor = OS.LoadCursor (0, OS.IDC_SIZEWE);	 	}		OS.SetCursor (hCursor);		return LRESULT.ONE;	}	return result;}}