bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorCanvas.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.utils.ui.color;
  13
  14 import org.eclipse.swt.SWT;
  15 import org.eclipse.swt.events.PaintEvent;
  16 import org.eclipse.swt.events.PaintListener;
  17 import org.eclipse.swt.graphics.GC;
  18 import org.eclipse.swt.graphics.Image;
  19 import org.eclipse.swt.graphics.Rectangle;
  20 import org.eclipse.swt.widgets.Canvas;
  21 import org.eclipse.swt.widgets.Composite;
  22 import org.eclipse.swt.widgets.Display;
  23
  24 /**
  25  *
  26  * Canvas that shows color gradients
  27  *
  28  * @author Marko Luukkainen
  29  *
  30  */
  31 public class ColorCanvas extends Canvas{
  32         Color color;
  33         int style;
  34
  35         public ColorCanvas(Composite parent, int style) {
  36                 // FIXME : use xor operation to get SWT.HORIZONTAL and SWT.VERTICAL
  37                 // out of style when it's passed to parent
  38                 super(parent,SWT.BORDER);
  39                 this.style = style & (SWT.VERTICAL | SWT.HORIZONTAL) ;
  40                 addPaintListener(new PaintListener() {
  41                 public void paintControl(PaintEvent e) {
  42                         GC gc = e.gc;
  43                         Rectangle clip = gc.getClipping();
  44                         if (color != null) {
  45                                 Image image = ColorIconCreator.createImage(color, clip.width,clip.height);
  46                                 gc.drawImage(image, 0, 0);
  47                                 image.dispose();
  48                         } else {
  49                                 gc.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
  50                                 gc.fillRectangle(clip);
  51                         }
  52                 }
  53             });
  54         }
  55
  56         public void setColor(Color color) {
  57                 this.color = color;
  58                 this.redraw();
  59         }
  60
  61 }