tracker.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

						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.x = oldX + xChange;
					event.y = oldY + yChange;
					if ((style & SWT.RESIZE) != 0) {
						resizeRectangles (xChange, yChange);
						inEvent = true;
						sendEvent (SWT.Resize, event);
						inEvent = false;
						/*
						* It is possible (but unlikely) that application
						* code could have disposed the widget in the resize
						* event.  If this happens return false to indicate
						* that the tracking has 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 ();
					} else {
						moveRectangles (xChange, yChange);
						inEvent = true;
						sendEvent (SWT.Move, event);
						inEvent = false;
						/*
						* It is possible (but unlikely) that application
						* code could have disposed the widget in the move
						* event.  If this happens return false to indicate
						* that the tracking has 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 ();
					}
					oldX = cursorPos.x;  oldY = cursorPos.y;
				}
				break;
		}
		if (OS.WM_KEYFIRST <= message && message <= OS.WM_KEYLAST) continue;
		if (OS.WM_MOUSEFIRST <= message && message <= OS.WM_MOUSELAST) continue;
		OS.DispatchMessage (msg);
	}
	if (mouseDown) OS.ReleaseCapture ();
	if (!isDisposed()) drawRectangles (rectangles, stippled);
	/*
	* Cleanup: If a transparent window was created in order to capture events then
	* destroy it and its callback object now.
	*/
	if (hwndTransparent != 0) {
		OS.DestroyWindow (hwndTransparent);
	}
	if (newProc != null) {
		newProc.dispose ();
	}
	/*
	* Cleanup: If this tracker was resizing then the last cursor that it created
	* needs to be destroyed.
	*/
	if (resizeCursor != 0) {
		OS.DestroyCursor (resizeCursor);
	}
	tracking = false;
	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 newCursor) {
	checkWidget();
	clientCursor = 0;
	if (newCursor != null) {
		clientCursor = newCursor.handle;
		if (inEvent) OS.SetCursor (clientCursor);
	}
}

/**
 * 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;
}
}