| /******************************************************************************* |
| * Copyright (c) 2000, 2009 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.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.cocoa.*; |
| |
| /** |
| * 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; |
| NSOpenGLContext context; |
| |
| Canvas () { |
| /* Do nothing */ |
| } |
| |
| int /*long*/ attributedSubstringFromRange (int /*long*/ id, int /*long*/ sel, int /*long*/ range) { |
| if (ime != null) return ime.attributedSubstringFromRange (id, sel, range); |
| return super.attributedSubstringFromRange(id, sel, range); |
| } |
| |
| void sendFocusEvent(int type) { |
| if (caret != null) { |
| if (type == SWT.FocusIn) { |
| caret.setFocus(); |
| } else { |
| caret.killFocus(); |
| } |
| } |
| super.sendFocusEvent(type); |
| } |
| |
| |
| /** |
| * 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, style); |
| } |
| |
| int /*long*/ characterIndexForPoint (int /*long*/ id, int /*long*/ sel, int /*long*/ point) { |
| if (ime != null) return ime.characterIndexForPoint (id, sel, point); |
| return super.characterIndexForPoint (id, sel, point); |
| } |
| |
| /** |
| * 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) { |
| NSRect rect = new NSRect(); |
| rect.x = x; |
| rect.y = y; |
| rect.width = width; |
| rect.height = height; |
| int imgHeight = -1; |
| GCData data = gc.getGCData(); |
| if (data.image != null) imgHeight = data.image.getBounds().height; |
| NSGraphicsContext context = gc.handle; |
| if (data.flippedContext != null) { |
| NSGraphicsContext.static_saveGraphicsState(); |
| NSGraphicsContext.setCurrentContext(context); |
| } |
| control.fillBackground (view, context, rect, imgHeight); |
| if (data.flippedContext != null) { |
| NSGraphicsContext.static_restoreGraphicsState(); |
| } |
| } else { |
| gc.fillRectangle (x, y, width, height); |
| } |
| } |
| |
| void drawRect (int /*long*/ id, int /*long*/ sel, NSRect rect) { |
| if (context != null && context.view() == null) context.setView(view); |
| super.drawRect(id, sel, rect); |
| } |
| |
| void drawWidget (int /*long*/ id, NSGraphicsContext context, NSRect rect) { |
| if (id != view.id) return; |
| super.drawWidget (id, context, rect); |
| if (caret == null) return; |
| if (caret.isShowing) { |
| Image image = caret.image; |
| if (image != null) { |
| NSImage imageHandle = image.handle; |
| NSImageRep imageRep = imageHandle.bestRepresentationForDevice(null); |
| if (!imageRep.isKindOfClass(OS.class_NSBitmapImageRep)) return; |
| NSBitmapImageRep rep = new NSBitmapImageRep(imageRep); |
| CGRect destRect = new CGRect (); |
| destRect.origin.x = caret.x; |
| destRect.origin.y = caret.y; |
| NSSize size = imageHandle.size(); |
| destRect.size.width = size.width; |
| destRect.size.height = size.height; |
| int /*long*/ data = rep.bitmapData(); |
| int /*long*/ bpr = rep.bytesPerRow(); |
| int alphaInfo = rep.hasAlpha() ? OS.kCGImageAlphaFirst : OS.kCGImageAlphaNoneSkipFirst; |
| int /*long*/ provider = OS.CGDataProviderCreateWithData(0, data, bpr * (int)size.height, 0); |
| int /*long*/ colorspace = OS.CGColorSpaceCreateDeviceRGB(); |
| int /*long*/ cgImage = OS.CGImageCreate((int)size.width, (int)size.height, rep.bitsPerSample(), rep.bitsPerPixel(), bpr, colorspace, alphaInfo, provider, 0, true, 0); |
| OS.CGColorSpaceRelease(colorspace); |
| OS.CGDataProviderRelease(provider); |
| int /*long*/ ctx = context.graphicsPort(); |
| OS.CGContextSaveGState(ctx); |
| OS.CGContextScaleCTM (ctx, 1, -1); |
| OS.CGContextTranslateCTM (ctx, 0, -(size.height + 2 * destRect.origin.y)); |
| OS.CGContextSetBlendMode (ctx, OS.kCGBlendModeDifference); |
| OS.CGContextDrawImage (ctx, destRect, cgImage); |
| OS.CGContextRestoreGState(ctx); |
| OS.CGImageRelease(cgImage); |
| } else { |
| context.saveGraphicsState(); |
| context.setCompositingOperation(OS.NSCompositeXOR); |
| NSRect drawRect = new NSRect(); |
| drawRect.x = caret.x; |
| drawRect.y = caret.y; |
| drawRect.width = caret.width != 0 ? caret.width : Caret.DEFAULT_WIDTH; |
| drawRect.height = caret.height; |
| context.setShouldAntialias(false); |
| NSColor color = NSColor.colorWithDeviceRed(1, 1, 1, 1); |
| color.set(); |
| NSBezierPath.fillRect(drawRect); |
| context.restoreGraphicsState(); |
| } |
| } |
| } |
| |
| NSRect firstRectForCharacterRange (int /*long*/ id, int /*long*/ sel, int /*long*/ range) { |
| if (ime != null) return ime.firstRectForCharacterRange (id, sel, range); |
| return super.firstRectForCharacterRange (id, sel, range); |
| } |
| |
| /** |
| * 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; |
| } |
| |
| /** |
| * 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; |
| } |
| |
| boolean hasMarkedText (int /*long*/ id, int /*long*/ sel) { |
| if (ime != null) return ime.hasMarkedText (id, sel); |
| return super.hasMarkedText (id, sel); |
| } |
| |
| boolean imeInComposition () { |
| return ime != null && ime.isInlineEnabled () && ime.startOffset != -1; |
| } |
| |
| boolean insertText (int /*long*/ id, int /*long*/ sel, int /*long*/ string) { |
| if (ime != null) { |
| if (!ime.insertText (id, sel, string)) return false; |
| } |
| return super.insertText (id, sel, string); |
| } |
| |
| boolean isOpaque (int /*long*/ id, int /*long*/ sel) { |
| if (context != null) return true; |
| return super.isOpaque(id, sel); |
| } |
| |
| NSRange markedRange (int /*long*/ id, int /*long*/ sel) { |
| if (ime != null) return ime.markedRange (id, sel); |
| return super.markedRange (id, sel); |
| } |
| |
| void releaseChildren (boolean destroy) { |
| if (caret != null) { |
| caret.release (false); |
| caret = null; |
| } |
| if (ime != null) { |
| ime.release (false); |
| ime = null; |
| } |
| super.releaseChildren (destroy); |
| } |
| |
| /** |
| * 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(); |
| if (width <= 0 || height <= 0) return; |
| int deltaX = destX - x, deltaY = destY - y; |
| if (deltaX == 0 && deltaY == 0) return; |
| if (!isDrawing ()) return; |
| NSRect visibleRect = view.visibleRect(); |
| if (visibleRect.width <= 0 || visibleRect.height <= 0) return; |
| boolean isFocus = caret != null && caret.isFocusCaret (); |
| if (isFocus) caret.killFocus (); |
| Rectangle clientRect = getClientArea (); |
| Rectangle sourceRect = new Rectangle (x, y, width, height); |
| if (sourceRect.intersects (clientRect)) { |
| update (all); |
| } |
| Control control = findBackgroundControl (); |
| boolean redraw = control != null && control.backgroundImage != null; |
| if (!redraw) redraw = isObscured (); |
| if (redraw) { |
| redrawWidget (view, x, y, width, height, false); |
| redrawWidget (view, destX, destY, width, height, false); |
| } else { |
| NSRect damage = new NSRect(); |
| damage.x = x; |
| damage.y = y; |
| damage.width = width; |
| damage.height = height; |
| NSPoint dest = new NSPoint(); |
| dest.x = destX; |
| dest.y = destY; |
| |
| view.lockFocus(); |
| OS.NSCopyBits(0, damage , dest); |
| view.unlockFocus(); |
| |
| boolean disjoint = (destX + width < x) || (x + width < destX) || (destY + height < y) || (y + height < destY); |
| if (disjoint) { |
| view.setNeedsDisplayInRect(damage); |
| } else { |
| if (deltaX != 0) { |
| int newX = destX - deltaX; |
| if (deltaX < 0) newX = destX + width; |
| damage.x = newX; |
| damage.width = Math.abs(deltaX); |
| view.setNeedsDisplayInRect(damage); |
| } |
| if (deltaY != 0) { |
| int newY = destY - deltaY; |
| if (deltaY < 0) newY = destY + height; |
| damage.x = x; |
| damage.y = newY; |
| damage.width = width; |
| damage.height = Math.abs (deltaY); |
| view.setNeedsDisplayInRect(damage); |
| } |
| } |
| |
| NSRect srcRect = new NSRect(); |
| srcRect.x = sourceRect.x; |
| srcRect.y = sourceRect.y; |
| srcRect.width = sourceRect.width; |
| srcRect.height = sourceRect.height; |
| OS.NSIntersectionRect(visibleRect, visibleRect, srcRect); |
| |
| if (!OS.NSEqualRects(visibleRect, srcRect)) { |
| if (srcRect.x != visibleRect.x) { |
| damage.x = srcRect.x + deltaX; |
| damage.y = srcRect.y + deltaY; |
| damage.width = visibleRect.x - srcRect.x; |
| damage.height = srcRect.height; |
| view.setNeedsDisplayInRect(damage); |
| } |
| if (visibleRect.x + visibleRect.width != srcRect.x + srcRect.width) { |
| damage.x = srcRect.x + visibleRect.width + deltaX; |
| damage.y = srcRect.y + deltaY; |
| damage.width = srcRect.width - visibleRect.width; |
| damage.height = srcRect.height; |
| view.setNeedsDisplayInRect(damage); |
| } |
| if (visibleRect.y != srcRect.y) { |
| damage.x = visibleRect.x + deltaX; |
| damage.y = srcRect.y + deltaY; |
| damage.width = visibleRect.width; |
| damage.height = visibleRect.y - srcRect.y; |
| view.setNeedsDisplayInRect(damage); |
| } |
| if (visibleRect.y + visibleRect.height != srcRect.y + srcRect.height) { |
| damage.x = visibleRect.x + deltaX; |
| damage.y = visibleRect.y + visibleRect.height + deltaY; |
| damage.width = visibleRect.width; |
| damage.height = srcRect.y + srcRect.height - (visibleRect.y + visibleRect.height); |
| view.setNeedsDisplayInRect(damage); |
| } |
| } |
| } |
| |
| if (all) { |
| Control [] children = _getChildren (); |
| for (int i=0; i<children.length; i++) { |
| Control child = children [i]; |
| Rectangle rect = child.getBounds (); |
| if (Math.min(x + width, rect.x + rect.width) >= Math.max (x, rect.x) && |
| Math.min(y + height, rect.y + rect.height) >= Math.max (y, rect.y)) { |
| child.setLocation (rect.x + deltaX, rect.y + deltaY); |
| } |
| } |
| } |
| if (isFocus) caret.setFocus (); |
| } |
| |
| NSRange selectedRange (int /*long*/ id, int /*long*/ sel) { |
| if (ime != null) return ime.selectedRange (id, sel); |
| return super.selectedRange (id, sel); |
| } |
| |
| boolean sendKeyEvent (NSEvent nsEvent, int type) { |
| if (caret != null) NSCursor.setHiddenUntilMouseMoves (true); |
| return super.sendKeyEvent (nsEvent, type); |
| } |
| |
| /** |
| * 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(); |
| Caret newCaret = caret; |
| Caret oldCaret = this.caret; |
| this.caret = newCaret; |
| if (hasFocus ()) { |
| if (oldCaret != null) oldCaret.killFocus (); |
| if (newCaret != null) { |
| if (newCaret.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT); |
| newCaret.setFocus (); |
| } |
| } |
| } |
| |
| public void setFont (Font font) { |
| checkWidget (); |
| if (caret != null) caret.setFont (font); |
| super.setFont (font); |
| } |
| |
| void setOpenGLContext(Object value) { |
| context = (NSOpenGLContext)value; |
| } |
| |
| /** |
| * 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; |
| } |
| |
| boolean setMarkedText_selectedRange (int /*long*/ id, int /*long*/ sel, int /*long*/ string, int /*long*/ range) { |
| if (ime != null) { |
| if (!ime.setMarkedText_selectedRange (id, sel, string, range)) return false; |
| } |
| return super.setMarkedText_selectedRange (id, sel, string, range); |
| } |
| |
| int /*long*/ validAttributesForMarkedText (int /*long*/ id, int /*long*/ sel) { |
| if (ime != null) return ime.validAttributesForMarkedText (id, sel); |
| return super.validAttributesForMarkedText(id, sel); |
| } |
| |
| void updateOpenGLContext(int /*long*/ id, int /*long*/ sel, int /*long*/ notification) { |
| if (context != null) ((NSOpenGLContext)context).update(); |
| } |
| |
| } |
