net.sourceforge.phpeclipse/src/net/sourceforge/phpeclipse/preferences/ColorEditor.java

   1 /*
   2  * (c) Copyright IBM Corp. 2000, 2001.
   3  * All Rights Reserved.
   4  */
   5 package net.sourceforge.phpeclipse.preferences;
   6
   7 import org.eclipse.jface.resource.JFaceResources;
   8 import org.eclipse.swt.SWT;
   9 import org.eclipse.swt.events.DisposeEvent;
  10 import org.eclipse.swt.events.DisposeListener;
  11 import org.eclipse.swt.events.SelectionAdapter;
  12 import org.eclipse.swt.events.SelectionEvent;
  13 import org.eclipse.swt.graphics.Color;
  14 import org.eclipse.swt.graphics.Font;
  15 import org.eclipse.swt.graphics.GC;
  16 import org.eclipse.swt.graphics.Image;
  17 import org.eclipse.swt.graphics.Point;
  18 import org.eclipse.swt.graphics.RGB;
  19 import org.eclipse.swt.widgets.Button;
  20 import org.eclipse.swt.widgets.ColorDialog;
  21 import org.eclipse.swt.widgets.Composite;
  22 import org.eclipse.swt.widgets.Control;
  23 import org.eclipse.swt.widgets.Display;
  24
  25 /**
  26  * A "button" of a certain color determined by the color picker.
  27  */
  28 public class ColorEditor {
  29
  30         private Point fExtent;
  31         private Image fImage;
  32         private RGB fColorValue;
  33         private Color fColor;
  34         private Button fButton;
  35
  36         public ColorEditor(Composite parent) {
  37
  38                 fButton= new Button(parent, SWT.PUSH);
  39                 fExtent= computeImageSize(parent);
  40                 fImage= new Image(parent.getDisplay(), fExtent.x, fExtent.y);
  41
  42                 GC gc= new GC(fImage);
  43                 gc.setBackground(fButton.getBackground());
  44                 gc.fillRectangle(0, 0, fExtent.x, fExtent.y);
  45                 gc.dispose();
  46
  47                 fButton.setImage(fImage);
  48                 fButton.addSelectionListener(new SelectionAdapter() {
  49                         public void widgetSelected(SelectionEvent event) {
  50                                 ColorDialog colorDialog= new ColorDialog(fButton.getShell());
  51                                 colorDialog.setRGB(fColorValue);
  52                                 RGB newColor = colorDialog.open();
  53                                 if (newColor != null) {
  54                                         fColorValue= newColor;
  55                                         updateColorImage();
  56                                 }
  57                         }
  58                 });
  59
  60                 fButton.addDisposeListener(new DisposeListener() {
  61                         public void widgetDisposed(DisposeEvent event) {
  62                                 if (fImage != null)  {
  63                                         fImage.dispose();
  64                                         fImage= null;
  65                                 }
  66                                 if (fColor != null) {
  67                                         fColor.dispose();
  68                                         fColor= null;
  69                                 }
  70                         }
  71                 });
  72         }
  73
  74         public RGB getColorValue() {
  75                 return fColorValue;
  76         }
  77
  78         public void setColorValue(RGB rgb) {
  79                 fColorValue= rgb;
  80                 updateColorImage();
  81         }
  82
  83         public Button getButton() {
  84                 return fButton;
  85         }
  86
  87         protected void updateColorImage() {
  88
  89                 Display display= fButton.getDisplay();
  90
  91                 GC gc= new GC(fImage);
  92                 gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
  93                 gc.drawRectangle(0, 2, fExtent.x - 1, fExtent.y - 4);
  94
  95                 if (fColor != null)
  96                         fColor.dispose();
  97
  98                 fColor= new Color(display, fColorValue);
  99                 gc.setBackground(fColor);
 100                 gc.fillRectangle(1, 3, fExtent.x - 2, fExtent.y - 5);
 101                 gc.dispose();
 102
 103                 fButton.setImage(fImage);
 104         }
 105
 106         protected Point computeImageSize(Control window) {
 107                 GC gc= new GC(window);
 108                 Font f= JFaceResources.getFontRegistry().get(JFaceResources.DEFAULT_FONT);
 109                 gc.setFont(f);
 110                 int height= gc.getFontMetrics().getHeight();
 111                 gc.dispose();
 112                 Point p= new Point(height * 3 - 6, height);
 113                 return p;
 114         }
 115 }