Mercurial > projects > dwt-samples
view snippets/canvas/Snippet48.d @ 120:1f0a7a472680
fix rm snippets from module statements.
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 20 Jul 2008 19:17:23 +0200 |
parents | 29bf9ba4756b |
children |
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/******************************************************************************* * Copyright (c) 2000, 2004 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 * D Port: * Bill Baxter <wbaxter> at gmail com *******************************************************************************/ module canvas.Snippet48; /* * Canvas example snippet: scroll an image (flicker free, no double buffering) * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */ import dwt.DWT; import dwt.graphics.GC; import dwt.graphics.Point; import dwt.graphics.Rectangle; import dwt.graphics.Color; import dwt.graphics.Image; import dwt.layout.FillLayout; import dwt.widgets.Display; import dwt.widgets.Shell; import dwt.widgets.Event; import dwt.widgets.Listener; import dwt.widgets.FileDialog; import dwt.widgets.Canvas; import dwt.widgets.ScrollBar; import dwt.layout.FillLayout; import dwt.dwthelper.utils; void main () { Display display = new Display (); Shell shell = new Shell (display); shell.setLayout(new FillLayout()); Image originalImage = null; FileDialog dialog = new FileDialog (shell, DWT.OPEN); dialog.setText ("Open an image file or cancel"); String string = dialog.open (); if (string !is null) { originalImage = new Image (display, string); } if (originalImage is null) { int width = 150, height = 200; originalImage = new Image (display, width, height); GC gc = new GC (originalImage); gc.fillRectangle (0, 0, width, height); gc.drawLine (0, 0, width, height); gc.drawLine (0, height, width, 0); gc.drawText ("Default Image", 10, 10); gc.dispose (); } final Image image = originalImage; final Point origin = new Point (0, 0); final Canvas canvas = new Canvas (shell, DWT.NO_BACKGROUND | DWT.NO_REDRAW_RESIZE | DWT.V_SCROLL | DWT.H_SCROLL); final ScrollBar hBar = canvas.getHorizontalBar (); void onHBarSelection (Event e) { int hSelection = hBar.getSelection (); int destX = -hSelection - origin.x; Rectangle rect = image.getBounds (); canvas.scroll (destX, 0, 0, 0, rect.width, rect.height, false); origin.x = -hSelection; } final ScrollBar vBar = canvas.getVerticalBar (); void onVBarSelection(Event e) { int vSelection = vBar.getSelection (); int destY = -vSelection - origin.y; Rectangle rect = image.getBounds (); canvas.scroll (0, destY, 0, 0, rect.width, rect.height, false); origin.y = -vSelection; } void onResize(Event e) { Rectangle rect = image.getBounds (); Rectangle client = canvas.getClientArea (); hBar.setMaximum (rect.width); vBar.setMaximum (rect.height); hBar.setThumb (Math.min (rect.width, client.width)); vBar.setThumb (Math.min (rect.height, client.height)); int hPage = rect.width - client.width; int vPage = rect.height - client.height; int hSelection = hBar.getSelection (); int vSelection = vBar.getSelection (); if (hSelection >= hPage) { if (hPage <= 0) hSelection = 0; origin.x = -hSelection; } if (vSelection >= vPage) { if (vPage <= 0) vSelection = 0; origin.y = -vSelection; } canvas.redraw (); } void onPaint (Event e) { GC gc = e.gc; gc.drawImage (image, origin.x, origin.y); Rectangle rect = image.getBounds (); Rectangle client = canvas.getClientArea (); int marginWidth = client.width - rect.width; if (marginWidth > 0) { gc.fillRectangle (rect.width, 0, marginWidth, client.height); } int marginHeight = client.height - rect.height; if (marginHeight > 0) { gc.fillRectangle (0, rect.height, client.width, marginHeight); } } hBar.addListener (DWT.Selection, dgListener(&onHBarSelection)); vBar.addListener (DWT.Selection, dgListener(&onVBarSelection)); canvas.addListener (DWT.Resize, dgListener(&onResize)); canvas.addListener (DWT.Paint, dgListener(&onPaint)); shell.setSize (200, 150); shell.open (); while (!shell.isDisposed ()) { if (!display.readAndDispatch ()) display.sleep (); } originalImage.dispose(); display.dispose (); }