Java tutorial
/******************************************************************************* * 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 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> * * @see <a href="http://www.eclipse.org/swt/snippets/#tracker">Tracker snippets</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 Tracker extends Widget { Control parent; boolean tracking, cancelled, stippled; Rectangle[] rectangles = new Rectangle[0], proportions = rectangles; Rectangle bounds; long resizeCursor; Cursor clientCursor; int cursorOrientation = SWT.NONE; boolean inEvent = false; boolean drawn; long hwndTransparent, hwndOpaque, oldTransparentProc, oldOpaqueProc; int oldX, oldY; /* * The following values mirror step sizes on Windows */ 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 * @see SWT#RESIZE */ 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; reskinWidget(); } /** * 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); } /** * Adds the listener to the collection of listeners who will * be notified when keys are pressed and released on the system keyboard, by sending * it one of the messages defined in the <code>KeyListener</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 KeyListener * @see #removeKeyListener */ public void addKeyListener(KeyListener listener) { checkWidget(); if (listener == null) error(SWT.ERROR_NULL_ARGUMENT); TypedListener typedListener = new TypedListener(listener); addListener(SWT.KeyUp, typedListener); addListener(SWT.KeyDown, typedListener); } Point adjustMoveCursor() { if (bounds == null) return null; int newX = bounds.x + bounds.width / 2; int newY = bounds.y; POINT pt = new POINT(); pt.x = newX; pt.y = newY; /* * Convert to screen coordinates iff needed */ if (parent != null) { OS.ClientToScreen(parent.handle, pt); } OS.SetCursorPos(pt.x, pt.y); return new Point(pt.x, pt.y); } Point adjustResizeCursor() { if (bounds == null) return null; 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; } POINT pt = new POINT(); pt.x = newX; pt.y = newY; /* * Convert to screen coordinates iff needed */ if (parent != null) { OS.ClientToScreen(parent.handle, pt); } OS.SetCursorPos(pt.x, pt.y); /* * If the client has not provided a custom cursor then determine * the appropriate resize cursor. */ if (clientCursor == null) { long newCursor = 0; switch (cursorOrientation) { case SWT.UP: newCursor = OS.LoadCursor(0, OS.IDC_SIZENS); break; case SWT.DOWN: newCursor = OS.LoadCursor(0, OS.IDC_SIZENS); break; case SWT.LEFT: newCursor = OS.LoadCursor(0, OS.IDC_SIZEWE); break; case SWT.RIGHT: newCursor = OS.LoadCursor(0, OS.IDC_SIZEWE); break; case SWT.LEFT | SWT.UP: newCursor = OS.LoadCursor(0, OS.IDC_SIZENWSE); break; case SWT.RIGHT | SWT.DOWN: newCursor = OS.LoadCursor(0, OS.IDC_SIZENWSE); break; case SWT.LEFT | SWT.DOWN: newCursor = OS.LoadCursor(0, OS.IDC_SIZENESW); break; case SWT.RIGHT | SWT.UP: newCursor = OS.LoadCursor(0, OS.IDC_SIZENESW); break; default: newCursor = OS.LoadCursor(0, OS.IDC_SIZEALL); break; } OS.SetCursor(newCursor); if (resizeCursor != 0) { OS.DestroyCursor(resizeCursor); } resizeCursor = newCursor; } return new Point(pt.x, pt.y); } 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() { if (rectangles.length == 0) return null; 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(); if (bounds != null) { 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; } /** * Draw the rectangles displayed by the tracker. */ void drawRectangles(Rectangle[] rects, boolean stippled) { if (hwndOpaque != 0) { RECT rect1 = new RECT(); int bandWidth = stippled ? 3 : 1; for (int i = 0; i < rects.length; i++) { Rectangle rect = rects[i]; rect1.left = rect.x - bandWidth; rect1.top = rect.y - bandWidth; rect1.right = rect.x + rect.width + bandWidth * 2; rect1.bottom = rect.y + rect.height + bandWidth * 2; OS.MapWindowPoints(0, hwndOpaque, rect1, 2); OS.RedrawWindow(hwndOpaque, rect1, 0, OS.RDW_INVALIDATE); } return; } int bandWidth = 1; long hwndTrack = parent == null ? OS.GetDesktopWindow() : parent.handle; long hDC = OS.GetDCEx(hwndTrack, 0, OS.DCX_CACHE); long hBitmap = 0, hBrush = 0, oldBrush = 0; if (stippled) { bandWidth = 3; byte[] bits = { -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0 }; hBitmap = OS.CreateBitmap(8, 8, 1, 1, bits); hBrush = OS.CreatePatternBrush(hBitmap); oldBrush = OS.SelectObject(hDC, hBrush); } for (int i = 0; i < rects.length; i++) { Rectangle rect = rects[i]; OS.PatBlt(hDC, rect.x, rect.y, rect.width, bandWidth, OS.PATINVERT); OS.PatBlt(hDC, rect.x, rect.y + bandWidth, bandWidth, rect.height - (bandWidth * 2), OS.PATINVERT); OS.PatBlt(hDC, rect.x + rect.width - bandWidth, rect.y + bandWidth, bandWidth, rect.height - (bandWidth * 2), OS.PATINVERT); OS.PatBlt(hDC, rect.x, rect.y + rect.height - bandWidth, rect.width, bandWidth, OS.PATINVERT); } if (stippled) { OS.SelectObject(hDC, oldBrush); OS.DeleteObject(hBrush); OS.DeleteObject(hBitmap); } OS.ReleaseDC(hwndTrack, hDC); } /** * 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(); Rectangle[] result = getRectanglesInPixels(); for (int i = 0; i < result.length; i++) { result[i] = DPIUtil.autoScaleDown(result[i]); } return result; } Rectangle[] getRectanglesInPixels() { Rectangle[] result = new Rectangle[rectangles.length]; for (int i = 0; i < rectangles.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 (bounds == null) return; if (xChange < 0 && ((style & SWT.LEFT) == 0)) xChange = 0; if (xChange > 0 && ((style & SWT.RIGHT) == 0)) xChange = 0; if (yChange < 0 && ((style & SWT.UP) == 0)) yChange = 0; if (yChange > 0 && ((style & SWT.DOWN) == 0)) yChange = 0; if (xChange == 0 && yChange == 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(); cancelled = false; tracking = true; /* * 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; } Callback newProc = null; boolean mouseDown = OS.GetKeyState(OS.VK_LBUTTON) < 0; /* * Bug in Vista. Drawing directly to the screen with XOR does not * perform well. The fix is to draw on layered window instead. * * Note that one window (almost opaque) is used for catching all events and a * second window is used for drawing the rectangles. */ if (parent == null) { Rectangle bounds = display.getBoundsInPixels(); hwndTransparent = OS.CreateWindowEx(OS.WS_EX_LAYERED | OS.WS_EX_NOACTIVATE | OS.WS_EX_TOOLWINDOW, display.windowClass, null, OS.WS_POPUP, bounds.x, bounds.y, bounds.width, bounds.height, 0, 0, OS.GetModuleHandle(null), null); OS.SetLayeredWindowAttributes(hwndTransparent, 0, (byte) 0x01, OS.LWA_ALPHA); hwndOpaque = OS.CreateWindowEx(OS.WS_EX_LAYERED | OS.WS_EX_NOACTIVATE | OS.WS_EX_TOOLWINDOW, display.windowClass, null, OS.WS_POPUP, bounds.x, bounds.y, bounds.width, bounds.height, hwndTransparent, 0, OS.GetModuleHandle(null), null); OS.SetLayeredWindowAttributes(hwndOpaque, 0xFFFFFF, (byte) 0, OS.LWA_COLORKEY | OS.LWA_ALPHA); drawn = false; newProc = new Callback(this, "transparentProc", 4); //$NON-NLS-1$ long newProcAddress = newProc.getAddress(); if (newProcAddress == 0) error(SWT.ERROR_NO_MORE_CALLBACKS); oldTransparentProc = OS.GetWindowLongPtr(hwndTransparent, OS.GWLP_WNDPROC); OS.SetWindowLongPtr(hwndTransparent, OS.GWLP_WNDPROC, newProcAddress); oldOpaqueProc = OS.GetWindowLongPtr(hwndOpaque, OS.GWLP_WNDPROC); OS.SetWindowLongPtr(hwndOpaque, OS.GWLP_WNDPROC, newProcAddress); OS.ShowWindow(hwndTransparent, OS.SW_SHOWNOACTIVATE); OS.ShowWindow(hwndOpaque, OS.SW_SHOWNOACTIVATE); } else { /* * If this tracker is being created without a mouse drag then * we need to create a transparent window that fills the screen * in order to get all mouse/keyboard events that occur * outside of our visible windows (ie.- over the desktop). */ if (!mouseDown) { Rectangle bounds = display.getBoundsInPixels(); hwndTransparent = OS.CreateWindowEx(OS.WS_EX_TRANSPARENT, display.windowClass, null, OS.WS_POPUP, bounds.x, bounds.y, bounds.width, bounds.height, 0, 0, OS.GetModuleHandle(null), null); newProc = new Callback(this, "transparentProc", 4); //$NON-NLS-1$ long newProcAddress = newProc.getAddress(); if (newProcAddress == 0) error(SWT.ERROR_NO_MORE_CALLBACKS); oldTransparentProc = OS.GetWindowLongPtr(hwndTransparent, OS.GWLP_WNDPROC); OS.SetWindowLongPtr(hwndTransparent, OS.GWLP_WNDPROC, newProcAddress); OS.ShowWindow(hwndTransparent, OS.SW_SHOWNOACTIVATE); } } update(); drawRectangles(rectangles, stippled); Point cursorPos = null; if (mouseDown) { POINT pt = new POINT(); OS.GetCursorPos(pt); cursorPos = new Point(pt.x, pt.y); } else { if ((style & SWT.RESIZE) != 0) { cursorPos = adjustResizeCursor(); } else { cursorPos = adjustMoveCursor(); } } if (cursorPos != null) { oldX = cursorPos.x; oldY = cursorPos.y; } Display display = this.display; try { /* Tracker behaves like a Dialog with its own OS event loop. */ MSG msg = new MSG(); while (tracking && !cancelled) { if (parent != null && parent.isDisposed()) break; display.runSkin(); display.runDeferredLayouts(); display.sendPreExternalEventDispatchEvent(); OS.GetMessage(msg, 0, 0, 0); display.sendPostExternalEventDispatchEvent(); OS.TranslateMessage(msg); switch (msg.message) { case OS.WM_LBUTTONUP: case OS.WM_MOUSEMOVE: wmMouse(msg.message, msg.wParam, msg.lParam); break; case OS.WM_IME_CHAR: wmIMEChar(msg.hwnd, msg.wParam, msg.lParam); break; case OS.WM_CHAR: wmChar(msg.hwnd, msg.wParam, msg.lParam); break; case OS.WM_KEYDOWN: wmKeyDown(msg.hwnd, msg.wParam, msg.lParam); break; case OS.WM_KEYUP: wmKeyUp(msg.hwnd, msg.wParam, msg.lParam); break; case OS.WM_SYSCHAR: wmSysChar(msg.hwnd, msg.wParam, msg.lParam); break; case OS.WM_SYSKEYDOWN: wmSysKeyDown(msg.hwnd, msg.wParam, msg.lParam); break; case OS.WM_SYSKEYUP: wmSysKeyUp(msg.hwnd, msg.wParam, msg.lParam); break; } if (OS.WM_KEYFIRST <= msg.message && msg.message <= OS.WM_KEYLAST) continue; if (OS.WM_MOUSEFIRST <= msg.message && msg.message <= OS.WM_MOUSELAST) continue; if (hwndOpaque == 0) { if (msg.message == OS.WM_PAINT) { update(); drawRectangles(rectangles, stippled); } } OS.DispatchMessage(msg); if (hwndOpaque == 0) { if (msg.message == OS.WM_PAINT) { drawRectangles(rectangles, stippled); } } display.runAsyncMessages(false); } if (mouseDown) OS.ReleaseCapture(); if (!isDisposed()) { update(); drawRectangles(rectangles, stippled); } } finally { /* * 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); hwndTransparent = 0; } hwndOpaque = 0; if (newProc != null) { newProc.dispose(); oldTransparentProc = oldOpaqueProc = 0; } /* * Cleanup: If this tracker was resizing then the last cursor that it created * needs to be destroyed. */ if (resizeCursor != 0) { OS.DestroyCursor(resizeCursor); resizeCursor = 0; } } tracking = false; return !cancelled; } @Override void releaseWidget() { super.releaseWidget(); parent = null; rectangles = proportions = null; bounds = null; } /** * 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 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 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); } /** * Removes the listener from the collection of listeners who will * be notified when keys are pressed and released on the system keyboard. * * @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 KeyListener * @see #addKeyListener */ public void removeKeyListener(KeyListener listener) { checkWidget(); if (listener == null) error(SWT.ERROR_NULL_ARGUMENT); if (eventTable == null) return; eventTable.unhook(SWT.KeyUp, listener); eventTable.unhook(SWT.KeyDown, listener); } void resizeRectangles(int xChange, int yChange) { if (bounds == null) return; /* * 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; } if (xChange > 0 && ((style & SWT.RIGHT) != 0) && ((cursorOrientation & SWT.LEFT) == 0)) { cursorOrientation |= SWT.RIGHT; } if (yChange < 0 && ((style & SWT.UP) != 0) && ((cursorOrientation & SWT.DOWN) == 0)) { cursorOrientation |= SWT.UP; } 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 = newCursor; if (newCursor != null) { if (inEvent) OS.SetCursor(clientCursor.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); Rectangle[] rectanglesInPixels = new Rectangle[rectangles.length]; for (int i = 0; i < rectangles.length; i++) { rectanglesInPixels[i] = DPIUtil.autoScaleUp(rectangles[i]); } setRectanglesInPixels(rectanglesInPixels); } void setRectanglesInPixels(Rectangle[] rectangles) { this.rectangles = new Rectangle[rectangles.length]; for (int i = 0; i < rectangles.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; } long transparentProc(long hwnd, long msg, long wParam, long lParam) { switch ((int) msg) { /* * We typically do not want to answer that the transparent window is * transparent to hits since doing so negates the effect of having it * to grab events. However, clients of the tracker should not be aware * of this transparent window. Therefore if there is a hit query * performed as a result of client code then answer that the transparent * window is transparent to hits so that its existence will not impact * the client. */ case OS.WM_NCHITTEST: if (inEvent) return OS.HTTRANSPARENT; break; case OS.WM_SETCURSOR: if (clientCursor != null) { OS.SetCursor(clientCursor.handle); return 1; } if (resizeCursor != 0) { OS.SetCursor(resizeCursor); return 1; } break; case OS.WM_PAINT: if (hwndOpaque == hwnd) { PAINTSTRUCT ps = new PAINTSTRUCT(); long hDC = OS.BeginPaint(hwnd, ps); long hBitmap = 0, hBrush = 0, oldBrush = 0; long transparentBrush = OS.CreateSolidBrush(0xFFFFFF); oldBrush = OS.SelectObject(hDC, transparentBrush); OS.PatBlt(hDC, ps.left, ps.top, ps.right - ps.left, ps.bottom - ps.top, OS.PATCOPY); OS.SelectObject(hDC, oldBrush); OS.DeleteObject(transparentBrush); int bandWidth = 1; if (stippled) { bandWidth = 3; byte[] bits = { -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0 }; hBitmap = OS.CreateBitmap(8, 8, 1, 1, bits); hBrush = OS.CreatePatternBrush(hBitmap); oldBrush = OS.SelectObject(hDC, hBrush); OS.SetBkColor(hDC, 0xF0F0F0); } else { oldBrush = OS.SelectObject(hDC, OS.GetStockObject(OS.BLACK_BRUSH)); } Rectangle[] rects = this.rectangles; RECT rect1 = new RECT(); for (int i = 0; i < rects.length; i++) { Rectangle rect = rects[i]; rect1.left = rect.x; rect1.top = rect.y; rect1.right = rect.x + rect.width; rect1.bottom = rect.y + rect.height; OS.MapWindowPoints(0, hwndOpaque, rect1, 2); int width = rect1.right - rect1.left; int height = rect1.bottom - rect1.top; OS.PatBlt(hDC, rect1.left, rect1.top, width, bandWidth, OS.PATCOPY); OS.PatBlt(hDC, rect1.left, rect1.top + bandWidth, bandWidth, height - (bandWidth * 2), OS.PATCOPY); OS.PatBlt(hDC, rect1.right - bandWidth, rect1.top + bandWidth, bandWidth, height - (bandWidth * 2), OS.PATCOPY); OS.PatBlt(hDC, rect1.left, rect1.bottom - bandWidth, width, bandWidth, OS.PATCOPY); } OS.SelectObject(hDC, oldBrush); if (stippled) { OS.DeleteObject(hBrush); OS.DeleteObject(hBitmap); } OS.EndPaint(hwnd, ps); if (!drawn) { OS.SetLayeredWindowAttributes(hwndOpaque, 0xFFFFFF, (byte) 0xFF, OS.LWA_COLORKEY | OS.LWA_ALPHA); drawn = true; } return 0; } } return OS.CallWindowProc(hwnd == hwndTransparent ? oldTransparentProc : oldOpaqueProc, hwnd, (int) msg, wParam, lParam); } void update() { if (hwndOpaque != 0) return; if (parent != null) { if (parent.isDisposed()) return; Shell shell = parent.getShell(); shell.update(true); } else { display.update(); } } @Override LRESULT wmKeyDown(long hwnd, long wParam, long lParam) { LRESULT result = super.wmKeyDown(hwnd, wParam, lParam); if (result != null) return result; boolean isMirrored = parent != null && (parent.style & SWT.MIRRORED) != 0; int stepSize = OS.GetKeyState(OS.VK_CONTROL) < 0 ? STEPSIZE_SMALL : STEPSIZE_LARGE; int xChange = 0, yChange = 0; switch ((int) wParam) { case OS.VK_ESCAPE: cancelled = true; tracking = false; break; case OS.VK_RETURN: tracking = false; break; case OS.VK_LEFT: xChange = isMirrored ? stepSize : -stepSize; break; case OS.VK_RIGHT: xChange = isMirrored ? -stepSize : stepSize; break; case OS.VK_UP: yChange = -stepSize; break; case OS.VK_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.setLocationInPixels(oldX + xChange, oldY + yChange); Point cursorPos; 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; return LRESULT.ONE; } 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); update(); 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; return LRESULT.ONE; } 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); update(); drawRectangles(rectangles, stippled); } cursorPos = adjustMoveCursor(); } if (cursorPos != null) { oldX = cursorPos.x; oldY = cursorPos.y; } } return result; } @Override LRESULT wmSysKeyDown(long hwnd, long wParam, long lParam) { LRESULT result = super.wmSysKeyDown(hwnd, wParam, lParam); if (result != null) return result; cancelled = true; tracking = false; return result; } LRESULT wmMouse(int message, long wParam, long lParam) { boolean isMirrored = parent != null && (parent.style & SWT.MIRRORED) != 0; int newPos = OS.GetMessagePos(); int newX = OS.GET_X_LPARAM(newPos); int newY = OS.GET_Y_LPARAM(newPos); if (newX != oldX || newY != oldY) { 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.setLocationInPixels(newX, newY); if ((style & SWT.RESIZE) != 0) { if (isMirrored) { resizeRectangles(oldX - newX, newY - oldY); } else { resizeRectangles(newX - oldX, newY - oldY); } 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; return LRESULT.ONE; } 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); update(); drawRectangles(rectangles, stippled); } Point cursorPos = adjustResizeCursor(); if (cursorPos != null) { newX = cursorPos.x; newY = cursorPos.y; } } else { if (isMirrored) { moveRectangles(oldX - newX, newY - oldY); } else { moveRectangles(newX - oldX, newY - oldY); } 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; return LRESULT.ONE; } 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); update(); drawRectangles(rectangles, stippled); } } oldX = newX; oldY = newY; } tracking = message != OS.WM_LBUTTONUP; return null; } }