| /******************************************************************************* |
| * 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.wpf.*; |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| |
| /** |
| * Instances of this class provide a surface for drawing |
| * arbitrary graphics. |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>(none)</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>(none)</dd> |
| * </dl> |
| * <p> |
| * This class may be subclassed by custom control implementors |
| * who are building controls that are <em>not</em> constructed |
| * from aggregates of other controls. That is, they are either |
| * painted using SWT graphics calls or are handled by native |
| * methods. |
| * </p> |
| * |
| * @see Composite |
| * @see <a href="http://www.eclipse.org/swt/snippets/#canvas">Canvas snippets</a> |
| * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a> |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| */ |
| |
| public class Canvas extends Composite { |
| Caret caret; |
| IME ime; |
| |
| /** |
| * Prevents uninitialized instances from being created outside the package. |
| */ |
| Canvas () { |
| } |
| |
| /** |
| * 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> |
| * </ul> |
| * |
| * @see SWT |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Canvas (Composite parent, int style) { |
| super (parent, checkStyle (style)); |
| } |
| |
| void clearArea (int x, int y, int width, int height) { |
| checkWidget (); |
| // if (OS.IsWindowVisible (handle)) { |
| // RECT rect = new RECT (); |
| // OS.SetRect (rect, x, y, x + width, y + height); |
| // int hDC = OS.GetDCEx (handle, 0, OS.DCX_CACHE | OS.DCX_CLIPCHILDREN | OS.DCX_CLIPSIBLINGS); |
| // drawBackground (hDC, rect); |
| // OS.ReleaseDC (handle, hDC); |
| // } |
| } |
| |
| /** |
| * Returns the caret. |
| * <p> |
| * The caret for the control is automatically hidden |
| * and shown when the control is painted or resized, |
| * when focus is gained or lost and when an the control |
| * is scrolled. To avoid drawing on top of the caret, |
| * the programmer must hide and show the caret when |
| * drawing in the window any other time. |
| * </p> |
| * |
| * @return the caret for the receiver, may be 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 Caret getCaret () { |
| checkWidget (); |
| return caret; |
| } |
| |
| int getCaretHandle () { |
| if (caret != null && !caret.isDisposed()) { |
| return caret.handle; |
| } |
| return 0; |
| } |
| |
| /** |
| * Returns the IME. |
| * |
| * @return the IME |
| * |
| * @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> |
| * |
| * @since 3.4 |
| */ |
| public IME getIME () { |
| checkWidget (); |
| return ime; |
| } |
| |
| void releaseChildren (boolean destroy) { |
| super.releaseChildren (destroy); |
| if (caret != null) { |
| caret.release (false); |
| caret = null; |
| } |
| if (ime != null) { |
| ime.release (false); |
| ime = null; |
| } |
| } |
| |
| /** |
| * Fills the interior of the rectangle specified by the arguments, |
| * with the receiver's background. |
| * |
| * @param gc the gc where the rectangle is to be filled |
| * @param x the x coordinate of the rectangle to be filled |
| * @param y the y coordinate of the rectangle to be filled |
| * @param width the width of the rectangle to be filled |
| * @param height the height of the rectangle to be filled |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the gc is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the gc has been disposed</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> |
| * |
| * @since 3.2 |
| */ |
| public void drawBackground (GC gc, int x, int y, int width, int height) { |
| checkWidget (); |
| if (gc == null) error (SWT.ERROR_NULL_ARGUMENT); |
| if (gc.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT); |
| Control control = findBackgroundControl (); |
| if (control != null) { |
| if (width < 0) { |
| x = x + width; |
| width = -width; |
| } |
| if (height < 0) { |
| y = y + height; |
| height = -height; |
| } |
| Point pt = display.map (this, control, 0, 0); |
| int transform = OS.gcnew_TranslateTransform (-pt.x, -pt.y); |
| OS.DrawingContext_PushTransform (gc.handle, transform); |
| x += pt.x; |
| y += pt.y; |
| int rect = OS.gcnew_Rect (x, y, width, height); |
| int backgroundHandle = control.backgroundHandle (); |
| int property = backgroundProperty (); |
| int brush = OS.DependencyObject_GetValue (backgroundHandle, property); |
| OS.GCHandle_Free (property); |
| OS.DrawingContext_DrawRectangle (gc.handle, brush, 0, rect); |
| OS.DrawingContext_Pop (gc.handle); |
| OS.GCHandle_Free (transform); |
| OS.GCHandle_Free (rect); |
| OS.GCHandle_Free (brush); |
| } else { |
| gc.fillRectangle (x, y, width, height); |
| } |
| |
| } |
| |
| /** |
| * Scrolls a rectangular area of the receiver by first copying |
| * the source area to the destination and then causing the area |
| * of the source which is not covered by the destination to |
| * be repainted. Children that intersect the rectangle are |
| * optionally moved during the operation. In addition, outstanding |
| * paint events are flushed before the source area is copied to |
| * ensure that the contents of the canvas are drawn correctly. |
| * |
| * @param destX the x coordinate of the destination |
| * @param destY the y coordinate of the destination |
| * @param x the x coordinate of the source |
| * @param y the y coordinate of the source |
| * @param width the width of the area |
| * @param height the height of the area |
| * @param all <code>true</code>if children should be scrolled, and <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 void scroll (int destX, int destY, int x, int y, int width, int height, boolean all) { |
| checkWidget (); |
| // boolean isFocus = caret != null && caret.isFocusCaret (); |
| // if (isFocus) caret.killFocus (); |
| //TODO |
| redraw (false); |
| // if (isFocus) caret.setFocus (); |
| } |
| |
| /** |
| * Sets the receiver's caret. |
| * <p> |
| * The caret for the control is automatically hidden |
| * and shown when the control is painted or resized, |
| * when focus is gained or lost and when an the control |
| * is scrolled. To avoid drawing on top of the caret, |
| * the programmer must hide and show the caret when |
| * drawing in the window any other time. |
| * </p> |
| * @param caret the new caret for the receiver, may be null |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the caret has been disposed</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 setCaret (Caret caret) { |
| checkWidget (); |
| if (caret != null && caret.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT); |
| int children = OS.Panel_Children (handle); |
| if (this.caret != null) { |
| OS.UIElementCollection_Remove (children, this.caret.handle); |
| } |
| this.caret = caret; |
| if (caret != null) { |
| OS.UIElementCollection_Insert (children, 0, caret.handle); |
| if (hasFocus ()) caret.show (); |
| } |
| OS.GCHandle_Free (children); |
| } |
| |
| public void setFont (Font font) { |
| checkWidget (); |
| if (caret != null) caret.setFont (font); |
| super.setFont (font); |
| } |
| |
| /** |
| * Sets the receiver's IME. |
| * |
| * @param ime the new IME for the receiver, may be null |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the IME has been disposed</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> |
| * |
| * @since 3.4 |
| */ |
| public void setIME (IME ime) { |
| checkWidget (); |
| if (ime != null && ime.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT); |
| this.ime = ime; |
| } |
| |
| void HandlePreviewGotKeyboardFocus (int sender, int e) { |
| if (!checkEvent (e)) return; |
| super.HandlePreviewGotKeyboardFocus (sender, e); |
| if (caret != null) caret.show (); |
| } |
| |
| void HandleLostKeyboardFocus (int sender, int e) { |
| if (!checkEvent (e)) return; |
| super.HandleLostKeyboardFocus (sender, e); |
| if (caret != null) caret.hide (); |
| } |
| |
| } |