Mercurial > projects > dwt-samples
annotate snippets/canvas/Snippet48.d @ 120:1f0a7a472680
fix rm snippets from module statements.
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Sun, 20 Jul 2008 19:17:23 +0200 |
| parents | 29bf9ba4756b |
| children |
| rev | line source |
|---|---|
| 90 | 1 /******************************************************************************* |
| 2 * Copyright (c) 2000, 2004 IBM Corporation and others. | |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * D Port: | |
| 11 * Bill Baxter <wbaxter> at gmail com | |
| 12 *******************************************************************************/ | |
|
120
1f0a7a472680
fix rm snippets from module statements.
Frank Benoit <benoit@tionex.de>
parents:
90
diff
changeset
|
13 module canvas.Snippet48; |
| 90 | 14 |
| 15 /* | |
| 16 * Canvas example snippet: scroll an image (flicker free, no double buffering) | |
| 17 * | |
| 18 * For a list of all SWT example snippets see | |
| 19 * http://www.eclipse.org/swt/snippets/ | |
| 20 */ | |
| 21 import dwt.DWT; | |
| 22 import dwt.graphics.GC; | |
| 23 import dwt.graphics.Point; | |
| 24 import dwt.graphics.Rectangle; | |
| 25 import dwt.graphics.Color; | |
| 26 import dwt.graphics.Image; | |
| 27 import dwt.layout.FillLayout; | |
| 28 import dwt.widgets.Display; | |
| 29 import dwt.widgets.Shell; | |
| 30 import dwt.widgets.Event; | |
| 31 import dwt.widgets.Listener; | |
| 32 import dwt.widgets.FileDialog; | |
| 33 import dwt.widgets.Canvas; | |
| 34 import dwt.widgets.ScrollBar; | |
| 35 import dwt.layout.FillLayout; | |
| 36 | |
| 37 import dwt.dwthelper.utils; | |
| 38 | |
| 39 void main () { | |
| 40 Display display = new Display (); | |
| 41 Shell shell = new Shell (display); | |
| 42 shell.setLayout(new FillLayout()); | |
| 43 Image originalImage = null; | |
| 44 FileDialog dialog = new FileDialog (shell, DWT.OPEN); | |
| 45 dialog.setText ("Open an image file or cancel"); | |
| 46 String string = dialog.open (); | |
| 47 if (string !is null) { | |
| 48 originalImage = new Image (display, string); | |
| 49 } | |
| 50 if (originalImage is null) { | |
| 51 int width = 150, height = 200; | |
| 52 originalImage = new Image (display, width, height); | |
| 53 GC gc = new GC (originalImage); | |
| 54 gc.fillRectangle (0, 0, width, height); | |
| 55 gc.drawLine (0, 0, width, height); | |
| 56 gc.drawLine (0, height, width, 0); | |
| 57 gc.drawText ("Default Image", 10, 10); | |
| 58 gc.dispose (); | |
| 59 } | |
| 60 final Image image = originalImage; | |
| 61 final Point origin = new Point (0, 0); | |
| 62 final Canvas canvas = new Canvas (shell, DWT.NO_BACKGROUND | | |
| 63 DWT.NO_REDRAW_RESIZE | DWT.V_SCROLL | DWT.H_SCROLL); | |
| 64 final ScrollBar hBar = canvas.getHorizontalBar (); | |
| 65 void onHBarSelection (Event e) { | |
| 66 int hSelection = hBar.getSelection (); | |
| 67 int destX = -hSelection - origin.x; | |
| 68 Rectangle rect = image.getBounds (); | |
| 69 canvas.scroll (destX, 0, 0, 0, rect.width, rect.height, false); | |
| 70 origin.x = -hSelection; | |
| 71 } | |
| 72 final ScrollBar vBar = canvas.getVerticalBar (); | |
| 73 void onVBarSelection(Event e) { | |
| 74 int vSelection = vBar.getSelection (); | |
| 75 int destY = -vSelection - origin.y; | |
| 76 Rectangle rect = image.getBounds (); | |
| 77 canvas.scroll (0, destY, 0, 0, rect.width, rect.height, false); | |
| 78 origin.y = -vSelection; | |
| 79 } | |
| 80 void onResize(Event e) { | |
| 81 Rectangle rect = image.getBounds (); | |
| 82 Rectangle client = canvas.getClientArea (); | |
| 83 hBar.setMaximum (rect.width); | |
| 84 vBar.setMaximum (rect.height); | |
| 85 hBar.setThumb (Math.min (rect.width, client.width)); | |
| 86 vBar.setThumb (Math.min (rect.height, client.height)); | |
| 87 int hPage = rect.width - client.width; | |
| 88 int vPage = rect.height - client.height; | |
| 89 int hSelection = hBar.getSelection (); | |
| 90 int vSelection = vBar.getSelection (); | |
| 91 if (hSelection >= hPage) { | |
| 92 if (hPage <= 0) hSelection = 0; | |
| 93 origin.x = -hSelection; | |
| 94 } | |
| 95 if (vSelection >= vPage) { | |
| 96 if (vPage <= 0) vSelection = 0; | |
| 97 origin.y = -vSelection; | |
| 98 } | |
| 99 canvas.redraw (); | |
| 100 } | |
| 101 void onPaint (Event e) { | |
| 102 GC gc = e.gc; | |
| 103 gc.drawImage (image, origin.x, origin.y); | |
| 104 Rectangle rect = image.getBounds (); | |
| 105 Rectangle client = canvas.getClientArea (); | |
| 106 int marginWidth = client.width - rect.width; | |
| 107 if (marginWidth > 0) { | |
| 108 gc.fillRectangle (rect.width, 0, marginWidth, client.height); | |
| 109 } | |
| 110 int marginHeight = client.height - rect.height; | |
| 111 if (marginHeight > 0) { | |
| 112 gc.fillRectangle (0, rect.height, client.width, marginHeight); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 hBar.addListener (DWT.Selection, dgListener(&onHBarSelection)); | |
| 117 vBar.addListener (DWT.Selection, dgListener(&onVBarSelection)); | |
| 118 canvas.addListener (DWT.Resize, dgListener(&onResize)); | |
| 119 canvas.addListener (DWT.Paint, dgListener(&onPaint)); | |
| 120 | |
| 121 shell.setSize (200, 150); | |
| 122 shell.open (); | |
| 123 while (!shell.isDisposed ()) { | |
| 124 if (!display.readAndDispatch ()) display.sleep (); | |
| 125 } | |
| 126 originalImage.dispose(); | |
| 127 display.dispose (); | |
| 128 } | |
| 129 |