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Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT/wpf/org/eclipse/swt/widgets/Canvas.java')
| -rw-r--r-- | bundles/org.eclipse.swt/Eclipse SWT/wpf/org/eclipse/swt/widgets/Canvas.java | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/wpf/org/eclipse/swt/widgets/Canvas.java b/bundles/org.eclipse.swt/Eclipse SWT/wpf/org/eclipse/swt/widgets/Canvas.java new file mode 100644 index 0000000000..d662b69410 --- /dev/null +++ b/bundles/org.eclipse.swt/Eclipse SWT/wpf/org/eclipse/swt/widgets/Canvas.java @@ -0,0 +1,313 @@ +/******************************************************************************* + * 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 (); +} + +} |