| /******************************************************************************* |
| * 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.motif.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.events.*; |
| |
| /** |
| * Instances of this class implement rubber banding rectangles that are |
| * drawn onto a parent <code>Composite</code> or <code>Display</code>. |
| * These rectangles can be specified to respond to mouse and key events |
| * by either moving or resizing themselves accordingly. Trackers are |
| * typically used to represent window geometries in a lightweight manner. |
| * |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>LEFT, RIGHT, UP, DOWN, RESIZE</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>Move, Resize</dd> |
| * </dl> |
| * <p> |
| * Note: Rectangle move behavior is assumed unless RESIZE is specified. |
| * </p><p> |
| * IMPORTANT: This class is <em>not</em> intended to be subclassed. |
| * </p> |
| */ |
| public class Tracker extends Widget { |
| Composite parent; |
| boolean tracking, stippled; |
| Rectangle [] rectangles, proportions; |
| Rectangle bounds; |
| int cursorOrientation = SWT.NONE; |
| int cursor; |
| final static int STEPSIZE_SMALL = 1; |
| final static int STEPSIZE_LARGE = 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 widget which will be the parent of the new instance (cannot be null) |
| * @param style the style of widget 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#LEFT |
| * @see SWT#RIGHT |
| * @see SWT#UP |
| * @see SWT#DOWN |
| * @see SWT#RESIZE |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Tracker (Composite parent, int style) { |
| super (parent, checkStyle (style)); |
| this.parent = parent; |
| } |
| |
| /** |
| * Constructs a new instance of this class given the display |
| * to create it on and a style value describing its behavior |
| * and appearance. |
| * <p> |
| * The style value is either one of the style constants defined in |
| * class <code>SWT</code> which is applicable to instances of this |
| * class, or must be built by <em>bitwise OR</em>'ing together |
| * (that is, using the <code>int</code> "|" operator) two or more |
| * of those <code>SWT</code> style constants. The class description |
| * lists the style constants that are applicable to the class. |
| * Style bits are also inherited from superclasses. |
| * </p><p> |
| * Note: Currently, null can be passed in for the display argument. |
| * This has the effect of creating the tracker on the currently active |
| * display if there is one. If there is no current display, the |
| * tracker is created on a "default" display. <b>Passing in null as |
| * the display argument is not considered to be good coding style, |
| * and may not be supported in a future release of SWT.</b> |
| * </p> |
| * |
| * @param display the display to create the tracker on |
| * @param style the style of control to construct |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see SWT#LEFT |
| * @see SWT#RIGHT |
| * @see SWT#UP |
| * @see SWT#DOWN |
| */ |
| public Tracker (Display display, int style) { |
| if (display == null) display = Display.getCurrent (); |
| if (display == null) display = Display.getDefault (); |
| if (!display.isValidThread ()) { |
| error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| } |
| this.style = checkStyle (style); |
| this.display = display; |
| } |
| |
| /** |
| * Adds the listener to the collection of listeners who will |
| * be notified when the control is moved or resized, by sending |
| * it one of the messages defined in the <code>ControlListener</code> |
| * interface. |
| * |
| * @param listener the listener which should be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see ControlListener |
| * @see #removeControlListener |
| */ |
| public void addControlListener (ControlListener listener) { |
| checkWidget (); |
| if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); |
| TypedListener typedListener = new TypedListener (listener); |
| addListener (SWT.Resize, typedListener); |
| addListener (SWT.Move, typedListener); |
| } |
| |
| Point adjustMoveCursor (int xDisplay, int xWindow) { |
| final int unused[] = new int[1]; |
| int actualX[] = new int[1]; |
| int actualY[] = new int[1]; |
| |
| int newX = bounds.x + bounds.width / 2; |
| int newY = bounds.y; |
| |
| OS.XWarpPointer (xDisplay, OS.None, xWindow, 0, 0, 0, 0, newX, newY); |
| /* |
| * The call to XWarpPointer does not always place the pointer on the |
| * exact location that is specified, so do a query (below) to get the |
| * actual location of the pointer after it has been moved. |
| */ |
| OS.XQueryPointer (xDisplay, xWindow, unused, unused, actualX, actualY, unused, unused, unused); |
| return new Point (actualX[0], actualY[0]); |
| } |
| Point adjustResizeCursor (int xDisplay, int xWindow) { |
| int newX, newY; |
| |
| if ((cursorOrientation & SWT.LEFT) != 0) { |
| newX = bounds.x; |
| } else if ((cursorOrientation & SWT.RIGHT) != 0) { |
| newX = bounds.x + bounds.width; |
| } else { |
| newX = bounds.x + bounds.width / 2; |
| } |
| |
| if ((cursorOrientation & SWT.UP) != 0) { |
| newY = bounds.y; |
| } else if ((cursorOrientation & SWT.DOWN) != 0) { |
| newY = bounds.y + bounds.height; |
| } else { |
| newY = bounds.y + bounds.height / 2; |
| } |
| |
| final int unused[] = new int[1]; |
| int actualX[] = new int[1]; |
| int actualY[] = new int[1]; |
| OS.XWarpPointer (xDisplay, 0, xWindow, 0, 0, 0, 0, newX, newY); |
| /* |
| * The call to XWarpPointer does not always place the pointer on the |
| * exact location that is specified, so do a query (below) to get the |
| * actual location of the pointer after it has been moved. |
| */ |
| OS.XQueryPointer (xDisplay, xWindow, unused, unused, actualX, actualY, unused, unused, unused); |
| return new Point (actualX[0], actualY[0]); |
| } |
| static int checkStyle (int style) { |
| if ((style & (SWT.LEFT | SWT.RIGHT | SWT.UP | SWT.DOWN)) == 0) { |
| style |= SWT.LEFT | SWT.RIGHT | SWT.UP | SWT.DOWN; |
| } |
| return style; |
| } |
| /** |
| * Stops displaying the tracker rectangles. Note that this is not considered |
| * to be a cancelation by the user. |
| * |
| * @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 close () { |
| checkWidget (); |
| tracking = false; |
| } |
| Rectangle computeBounds () { |
| int xMin = rectangles [0].x; |
| int yMin = rectangles [0].y; |
| int xMax = rectangles [0].x + rectangles [0].width; |
| int yMax = rectangles [0].y + rectangles [0].height; |
| |
| for (int i = 1; i < rectangles.length; i++) { |
| if (rectangles [i].x < xMin) xMin = rectangles [i].x; |
| if (rectangles [i].y < yMin) yMin = rectangles [i].y; |
| int rectRight = rectangles [i].x + rectangles [i].width; |
| if (rectRight > xMax) xMax = rectRight; |
| int rectBottom = rectangles [i].y + rectangles [i].height; |
| if (rectBottom > yMax) yMax = rectBottom; |
| } |
| |
| return new Rectangle (xMin, yMin, xMax - xMin, yMax - yMin); |
| } |
| |
| Rectangle [] computeProportions (Rectangle [] rects) { |
| Rectangle [] result = new Rectangle [rects.length]; |
| bounds = computeBounds (); |
| for (int i = 0; i < rects.length; i++) { |
| int x = 0, y = 0, width = 0, height = 0; |
| if (bounds.width != 0) { |
| x = (rects [i].x - bounds.x) * 100 / bounds.width; |
| width = rects [i].width * 100 / bounds.width; |
| } else { |
| width = 100; |
| } |
| if (bounds.height != 0) { |
| y = (rects [i].y - bounds.y) * 100 / bounds.height; |
| height = rects [i].height * 100 / bounds.height; |
| } else { |
| height = 100; |
| } |
| result [i] = new Rectangle (x, y, width, height); |
| } |
| return result; |
| } |
| |
| void drawRectangles (Rectangle [] rects, boolean stippled) { |
| if (parent != null) { |
| if (parent.isDisposed ()) return; |
| parent.getShell ().update (); |
| } else { |
| display.update (); |
| } |
| int xDisplay = display.xDisplay; |
| int color = OS.XWhitePixel (xDisplay, 0); |
| int xWindow = OS.XDefaultRootWindow (xDisplay); |
| if (parent != null) { |
| xWindow = OS.XtWindow (parent.handle); |
| if (xWindow == 0) return; |
| int [] argList = {OS.XmNforeground, 0, OS.XmNbackground, 0}; |
| OS.XtGetValues (parent.handle, argList, argList.length / 2); |
| color = argList [1] ^ argList [3]; |
| } |
| int gc = OS.XCreateGC (xDisplay, xWindow, 0, null); |
| OS.XSetForeground (xDisplay, gc, color); |
| OS.XSetSubwindowMode (xDisplay, gc, OS.IncludeInferiors); |
| OS.XSetFunction (xDisplay, gc, OS.GXxor); |
| int stipplePixmap = 0; |
| if (stippled) { |
| byte [] bits = {-86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0}; |
| stipplePixmap = OS.XCreateBitmapFromData (xDisplay, xWindow, bits, 8, 8); |
| OS.XSetStipple (xDisplay, gc, stipplePixmap); |
| OS.XSetFillStyle (xDisplay, gc, OS.FillStippled); |
| OS.XSetLineAttributes (xDisplay, gc, 3, OS.LineSolid, OS.CapButt, OS.JoinMiter); |
| } |
| for (int i=0; i<rects.length; i++) { |
| Rectangle rect = rects [i]; |
| OS.XDrawRectangle (xDisplay, xWindow, gc, rect.x, rect.y, rect.width, rect.height); |
| } |
| if (stippled) { |
| OS.XFreePixmap (xDisplay, stipplePixmap); |
| } |
| OS.XFreeGC (xDisplay, gc); |
| } |
| /** |
| * Returns the bounds that are being drawn, expressed relative to the parent |
| * widget. If the parent is a <code>Display</code> then these are screen |
| * coordinates. |
| * |
| * @return the bounds of the Rectangles being drawn |
| * |
| * @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 Rectangle [] getRectangles () { |
| checkWidget(); |
| int length = 0; |
| if (rectangles != null) length = rectangles.length; |
| Rectangle [] result = new Rectangle [length]; |
| for (int i = 0; i < length; i++) { |
| Rectangle current = rectangles [i]; |
| result [i] = new Rectangle (current.x, current.y, current.width, current.height); |
| } |
| return result; |
| } |
| /** |
| * Returns <code>true</code> if the rectangles are drawn with a stippled line, <code>false</code> otherwise. |
| * |
| * @return the stippled effect of the rectangles |
| * |
| * @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 getStippled () { |
| checkWidget (); |
| return stippled; |
| } |
| |
| void moveRectangles (int xChange, int yChange) { |
| if (xChange < 0 && ((style & SWT.LEFT) == 0)) return; |
| if (xChange > 0 && ((style & SWT.RIGHT) == 0)) return; |
| if (yChange < 0 && ((style & SWT.UP) == 0)) return; |
| if (yChange > 0 && ((style & SWT.DOWN) == 0)) return; |
| bounds.x += xChange; bounds.y += yChange; |
| for (int i = 0; i < rectangles.length; i++) { |
| rectangles [i].x += xChange; |
| rectangles [i].y += yChange; |
| } |
| } |
| |
| /** |
| * Displays the Tracker rectangles for manipulation by the user. Returns when |
| * the user has either finished manipulating the rectangles or has cancelled the |
| * Tracker. |
| * |
| * @return <code>true</code> if the user did not cancel the Tracker, <code>false</code> otherwise |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public boolean open () { |
| checkWidget (); |
| if (rectangles == null) return false; |
| int xDisplay = display.xDisplay; |
| int xWindow = OS.XDefaultRootWindow (xDisplay); |
| if (parent != null) { |
| xWindow = OS.XtWindow (parent.handle); |
| if (xWindow == 0) return false; |
| } |
| boolean cancelled = false; |
| tracking = true; |
| drawRectangles (rectangles, stippled); |
| int [] oldX = new int [1], oldY = new int [1]; |
| int [] unused = new int [1], mask = new int [1]; |
| OS.XQueryPointer (xDisplay, xWindow, unused, unused, oldX, oldY, unused, unused, mask); |
| |
| /* |
| * If exactly one of UP/DOWN is specified as a style then set the cursor |
| * orientation accordingly (the same is done for LEFT/RIGHT styles below). |
| */ |
| int vStyle = style & (SWT.UP | SWT.DOWN); |
| if (vStyle == SWT.UP || vStyle == SWT.DOWN) { |
| cursorOrientation |= vStyle; |
| } |
| int hStyle = style & (SWT.LEFT | SWT.RIGHT); |
| if (hStyle == SWT.LEFT || hStyle == SWT.RIGHT) { |
| cursorOrientation |= hStyle; |
| } |
| |
| Point cursorPos; |
| int mouseMasks = OS.Button1Mask | OS.Button2Mask | OS.Button3Mask; |
| boolean mouseDown = (mask [0] & mouseMasks) != 0; |
| if (!mouseDown) { |
| if ((style & SWT.RESIZE) != 0) { |
| cursorPos = adjustResizeCursor (xDisplay, xWindow); |
| } else { |
| cursorPos = adjustMoveCursor (xDisplay, xWindow); |
| } |
| oldX [0] = cursorPos.x; oldY [0] = cursorPos.y; |
| } |
| |
| int xEvent = OS.XtMalloc (XEvent.sizeof); |
| XEvent anyEvent = new XEvent(); |
| int [] newX = new int [1], newY = new int [1]; |
| int xtContext = OS.XtDisplayToApplicationContext (xDisplay); |
| |
| int ptrGrabResult = OS.XGrabPointer ( |
| xDisplay, |
| xWindow, |
| 0, |
| OS.ButtonPressMask | OS.ButtonReleaseMask | OS.PointerMotionMask, |
| OS.GrabModeAsync, |
| OS.GrabModeAsync, |
| OS.None, |
| OS.None, |
| OS.CurrentTime); |
| int kbdGrabResult = OS.XGrabKeyboard ( |
| xDisplay, |
| xWindow, |
| 0, |
| OS.GrabModeAsync, |
| OS.GrabModeAsync, |
| OS.CurrentTime); |
| |
| /* |
| * Tracker behaves like a Dialog with its own OS event loop. |
| */ |
| while (tracking) { |
| if (parent != null && parent.isDisposed ()) break; |
| OS.XtAppNextEvent (xtContext, xEvent); |
| OS.memmove (anyEvent, xEvent, XEvent.sizeof); |
| switch (anyEvent.type) { |
| case OS.MotionNotify: |
| if (cursor != 0) { |
| OS.XChangeActivePointerGrab ( |
| xDisplay, |
| OS.ButtonPressMask | OS.ButtonReleaseMask | OS.PointerMotionMask, |
| cursor, |
| OS.CurrentTime); |
| } |
| // fall through |
| case OS.ButtonRelease: |
| OS.XQueryPointer (xDisplay, xWindow, unused, unused, newX, newY, unused, unused, unused); |
| if (oldX [0] != newX [0] || oldY [0] != newY [0]) { |
| Rectangle [] oldRectangles = rectangles; |
| boolean oldStippled = stippled; |
| Rectangle [] rectsToErase = new Rectangle [rectangles.length]; |
| for (int i = 0; i < rectangles.length; i++) { |
| Rectangle current = rectangles [i]; |
| rectsToErase [i] = new Rectangle (current.x, current.y, current.width, current.height); |
| } |
| Event event = new Event (); |
| event.x = newX [0]; |
| event.y = newY [0]; |
| if ((style & SWT.RESIZE) != 0) { |
| resizeRectangles (newX [0] - oldX [0], newY [0] - oldY [0]); |
| sendEvent (SWT.Resize, event); |
| /* |
| * It is possible (but unlikely) that application code |
| * could have disposed the widget in the resize event. |
| * If this happens then return false to indicate that |
| * the move failed. |
| */ |
| if (isDisposed ()) { |
| cancelled = true; |
| break; |
| } |
| boolean draw = false; |
| /* |
| * It is possible that application code could have |
| * changed the rectangles in the resize event. If this |
| * happens then only redraw the tracker if the rectangle |
| * values have changed. |
| */ |
| if (rectangles != oldRectangles) { |
| int length = rectangles.length; |
| if (length != rectsToErase.length) { |
| draw = true; |
| } else { |
| for (int i = 0; i < length; i++) { |
| if (!rectangles [i].equals (rectsToErase [i])) { |
| draw = true; |
| break; |
| } |
| } |
| } |
| } else { |
| draw = true; |
| } |
| if (draw) { |
| drawRectangles (rectsToErase, oldStippled); |
| drawRectangles (rectangles, stippled); |
| } |
| cursorPos = adjustResizeCursor (xDisplay, xWindow); |
| newX [0] = cursorPos.x; newY [0] = cursorPos.y; |
| } else { |
| moveRectangles (newX [0] - oldX [0], newY [0] - oldY [0]); |
| sendEvent (SWT.Move, event); |
| /* |
| * It is possible (but unlikely) that application code |
| * could have disposed the widget in the move event. |
| * If this happens then return false to indicate that |
| * the move failed. |
| */ |
| if (isDisposed ()) { |
| cancelled = true; |
| break; |
| } |
| boolean draw = false; |
| /* |
| * It is possible that application code could have |
| * changed the rectangles in the move event. If this |
| * happens then only redraw the tracker if the rectangle |
| * values have changed. |
| */ |
| if (rectangles != oldRectangles) { |
| int length = rectangles.length; |
| if (length != rectsToErase.length) { |
| draw = true; |
| } else { |
| for (int i = 0; i < length; i++) { |
| if (!rectangles [i].equals (rectsToErase [i])) { |
| draw = true; |
| break; |
| } |
| } |
| } |
| } else { |
| draw = true; |
| } |
| if (draw) { |
| drawRectangles (rectsToErase, oldStippled); |
| drawRectangles (rectangles, stippled); |
| } |
| } |
| oldX [0] = newX [0]; oldY [0] = newY [0]; |
| } |
| tracking = anyEvent.type != OS.ButtonRelease; |
| break; |
| case OS.KeyPress: |
| XKeyEvent keyEvent = new XKeyEvent (); |
| OS.memmove (keyEvent, xEvent, XKeyEvent.sizeof); |
| if (keyEvent.keycode != 0) { |
| int [] keysym = new int [1]; |
| OS.XLookupString (keyEvent, null, 0, keysym, null); |
| keysym [0] &= 0xFFFF; |
| int xChange = 0, yChange = 0; |
| int stepSize = ((keyEvent.state & OS.ControlMask) != 0) ? STEPSIZE_SMALL : STEPSIZE_LARGE; |
| switch (keysym [0]) { |
| case OS.XK_KP_Enter: |
| case OS.XK_Return: |
| tracking = false; |
| /* |
| * Eat the subsequent KeyRelease event |
| */ |
| OS.XtAppNextEvent (xtContext, xEvent); |
| break; |
| case OS.XK_Escape: |
| tracking = false; |
| cancelled = true; |
| /* |
| * Eat the subsequent KeyRelease event |
| */ |
| OS.XtAppNextEvent (xtContext, xEvent); |
| break; |
| case OS.XK_Left: |
| xChange = -stepSize; |
| break; |
| case OS.XK_Right: |
| xChange = stepSize; |
| break; |
| case OS.XK_Up: |
| yChange = -stepSize; |
| break; |
| case OS.XK_Down: |
| yChange = stepSize; |
| break; |
| } |
| if (xChange != 0 || yChange != 0) { |
| Rectangle [] oldRectangles = rectangles; |
| boolean oldStippled = stippled; |
| Rectangle [] rectsToErase = new Rectangle [rectangles.length]; |
| for (int i = 0; i < rectangles.length; i++) { |
| Rectangle current = rectangles [i]; |
| rectsToErase [i] = new Rectangle (current.x, current.y, current.width, current.height); |
| } |
| Event event = new Event (); |
| event.x = oldX [0] + xChange; |
| event.y = oldY [0] + yChange; |
| if ((style & SWT.RESIZE) != 0) { |
| resizeRectangles (xChange, yChange); |
| sendEvent (SWT.Resize, event); |
| /* |
| * It is possible (but unlikely) that application code |
| * could have disposed the widget in the resize event. |
| * If this happens then return false to indicate that |
| * the move failed. |
| */ |
| if (isDisposed ()) { |
| cancelled = true; |
| break; |
| } |
| boolean draw = false; |
| /* |
| * It is possible that application code could have |
| * changed the rectangles in the resize event. If this |
| * happens then only redraw the tracker if the rectangle |
| * values have changed. |
| */ |
| if (rectangles != oldRectangles) { |
| int length = rectangles.length; |
| if (length != rectsToErase.length) { |
| draw = true; |
| } else { |
| for (int i = 0; i < length; i++) { |
| if (!rectangles [i].equals (rectsToErase [i])) { |
| draw = true; |
| break; |
| } |
| } |
| } |
| } else { |
| draw = true; |
| } |
| if (draw) { |
| drawRectangles (rectsToErase, oldStippled); |
| drawRectangles (rectangles, stippled); |
| } |
| cursorPos = adjustResizeCursor (xDisplay, xWindow); |
| } else { |
| moveRectangles (xChange, yChange); |
| sendEvent (SWT.Move, event); |
| /* |
| * It is possible (but unlikely) that application code |
| * could have disposed the widget in the move event. |
| * If this happens then return false to indicate that |
| * the move failed. |
| */ |
| if (isDisposed ()) { |
| cancelled = true; |
| break; |
| } |
| boolean draw = false; |
| /* |
| * It is possible that application code could have |
| * changed the rectangles in the move event. If this |
| * happens then only redraw the tracker if the rectangle |
| * values have changed. |
| */ |
| if (rectangles != oldRectangles) { |
| int length = rectangles.length; |
| if (length != rectsToErase.length) { |
| draw = true; |
| } else { |
| for (int i = 0; i < length; i++) { |
| if (!rectangles [i].equals (rectsToErase [i])) { |
| draw = true; |
| break; |
| } |
| } |
| } |
| } else { |
| draw = true; |
| } |
| if (draw) { |
| drawRectangles (rectsToErase, oldStippled); |
| drawRectangles (rectangles, stippled); |
| } |
| cursorPos = adjustMoveCursor (xDisplay, xWindow); |
| } |
| oldX [0] = cursorPos.x; oldY [0] = cursorPos.y; |
| } |
| } |
| break; |
| case OS.ButtonPress: |
| case OS.KeyRelease: |
| case OS.EnterNotify: |
| case OS.LeaveNotify: |
| /* Do not dispatch these */ |
| break; |
| default: |
| OS.XtDispatchEvent (xEvent); |
| } |
| } |
| OS.XtFree (xEvent); |
| if (!isDisposed()) drawRectangles (rectangles, stippled); |
| if (ptrGrabResult == OS.GrabSuccess) OS.XUngrabPointer (xDisplay, OS.CurrentTime); |
| if (kbdGrabResult == OS.GrabSuccess) OS.XUngrabKeyboard (xDisplay, OS.CurrentTime); |
| return !cancelled; |
| } |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the control is moved or resized. |
| * |
| * @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 ControlListener |
| * @see #addControlListener |
| */ |
| public void removeControlListener (ControlListener listener) { |
| checkWidget (); |
| if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); |
| if (eventTable == null) return; |
| eventTable.unhook (SWT.Resize, listener); |
| eventTable.unhook (SWT.Move, listener); |
| } |
| void resizeRectangles (int xChange, int yChange) { |
| /* |
| * If the cursor orientation has not been set in the orientation of |
| * this change then try to set it here. |
| */ |
| if (xChange < 0 && ((style & SWT.LEFT) != 0) && ((cursorOrientation & SWT.RIGHT) == 0)) { |
| cursorOrientation |= SWT.LEFT; |
| } else if (xChange > 0 && ((style & SWT.RIGHT) != 0) && ((cursorOrientation & SWT.LEFT) == 0)) { |
| cursorOrientation |= SWT.RIGHT; |
| } else if (yChange < 0 && ((style & SWT.UP) != 0) && ((cursorOrientation & SWT.DOWN) == 0)) { |
| cursorOrientation |= SWT.UP; |
| } else if (yChange > 0 && ((style & SWT.DOWN) != 0) && ((cursorOrientation & SWT.UP) == 0)) { |
| cursorOrientation |= SWT.DOWN; |
| } |
| |
| /* |
| * If the bounds will flip about the x or y axis then apply the adjustment |
| * up to the axis (ie.- where bounds width/height becomes 0), change the |
| * cursor's orientation accordingly, and flip each Rectangle's origin (only |
| * necessary for > 1 Rectangles) |
| */ |
| if ((cursorOrientation & SWT.LEFT) != 0) { |
| if (xChange > bounds.width) { |
| if ((style & SWT.RIGHT) == 0) return; |
| cursorOrientation |= SWT.RIGHT; |
| cursorOrientation &= ~SWT.LEFT; |
| bounds.x += bounds.width; |
| xChange -= bounds.width; |
| bounds.width = 0; |
| if (proportions.length > 1) { |
| for (int i = 0; i < proportions.length; i++) { |
| Rectangle proportion = proportions [i]; |
| proportion.x = 100 - proportion.x - proportion.width; |
| } |
| } |
| } |
| } else if ((cursorOrientation & SWT.RIGHT) != 0) { |
| if (bounds.width < -xChange) { |
| if ((style & SWT.LEFT) == 0) return; |
| cursorOrientation |= SWT.LEFT; |
| cursorOrientation &= ~SWT.RIGHT; |
| xChange += bounds.width; |
| bounds.width = 0; |
| if (proportions.length > 1) { |
| for (int i = 0; i < proportions.length; i++) { |
| Rectangle proportion = proportions [i]; |
| proportion.x = 100 - proportion.x - proportion.width; |
| } |
| } |
| } |
| } |
| if ((cursorOrientation & SWT.UP) != 0) { |
| if (yChange > bounds.height) { |
| if ((style & SWT.DOWN) == 0) return; |
| cursorOrientation |= SWT.DOWN; |
| cursorOrientation &= ~SWT.UP; |
| bounds.y += bounds.height; |
| yChange -= bounds.height; |
| bounds.height = 0; |
| if (proportions.length > 1) { |
| for (int i = 0; i < proportions.length; i++) { |
| Rectangle proportion = proportions [i]; |
| proportion.y = 100 - proportion.y - proportion.height; |
| } |
| } |
| } |
| } else if ((cursorOrientation & SWT.DOWN) != 0) { |
| if (bounds.height < -yChange) { |
| if ((style & SWT.UP) == 0) return; |
| cursorOrientation |= SWT.UP; |
| cursorOrientation &= ~SWT.DOWN; |
| yChange += bounds.height; |
| bounds.height = 0; |
| if (proportions.length > 1) { |
| for (int i = 0; i < proportions.length; i++) { |
| Rectangle proportion = proportions [i]; |
| proportion.y = 100 - proportion.y - proportion.height; |
| } |
| } |
| } |
| } |
| |
| // apply the bounds adjustment |
| if ((cursorOrientation & SWT.LEFT) != 0) { |
| bounds.x += xChange; |
| bounds.width -= xChange; |
| } else if ((cursorOrientation & SWT.RIGHT) != 0) { |
| bounds.width += xChange; |
| } |
| if ((cursorOrientation & SWT.UP) != 0) { |
| bounds.y += yChange; |
| bounds.height -= yChange; |
| } else if ((cursorOrientation & SWT.DOWN) != 0) { |
| bounds.height += yChange; |
| } |
| |
| Rectangle [] newRects = new Rectangle [rectangles.length]; |
| for (int i = 0; i < rectangles.length; i++) { |
| Rectangle proportion = proportions[i]; |
| newRects[i] = new Rectangle ( |
| proportion.x * bounds.width / 100 + bounds.x, |
| proportion.y * bounds.height / 100 + bounds.y, |
| proportion.width * bounds.width / 100, |
| proportion.height * bounds.height / 100); |
| } |
| rectangles = newRects; |
| } |
| |
| /** |
| * Sets the <code>Cursor</code> of the Tracker. If this cursor is <code>null</code> |
| * then the cursor reverts to the default. |
| * |
| * @param newCursor the new <code>Cursor</code> to display |
| * |
| * @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 setCursor (Cursor value) { |
| checkWidget (); |
| cursor = 0; |
| if (value != null) cursor = value.handle; |
| } |
| /** |
| * Specifies the rectangles that should be drawn, expressed relative to the parent |
| * widget. If the parent is a Display then these are screen coordinates. |
| * |
| * @param rectangles the bounds of the rectangles to be drawn |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the set of rectangles is null or contains a null rectangle</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> |
| */ |
| public void setRectangles (Rectangle [] rectangles) { |
| checkWidget (); |
| if (rectangles == null) error (SWT.ERROR_NULL_ARGUMENT); |
| int length = rectangles.length; |
| this.rectangles = new Rectangle [length]; |
| for (int i = 0; i < length; i++) { |
| Rectangle current = rectangles [i]; |
| if (current == null) error (SWT.ERROR_NULL_ARGUMENT); |
| this.rectangles [i] = new Rectangle (current.x, current.y, current.width, current.height); |
| } |
| proportions = computeProportions (rectangles); |
| } |
| /** |
| * Changes the appearance of the line used to draw the rectangles. |
| * |
| * @param stippled <code>true</code> if rectangle should appear stippled |
| * |
| * @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 setStippled (boolean stippled) { |
| checkWidget (); |
| this.stippled = stippled; |
| } |
| } |