bundles/org.simantics.views.swt.client/src/org/simantics/views/swt/client/impl/SWTButton.java

   1 package org.simantics.views.swt.client.impl;\r
   2 \r
   3 import java.io.ByteArrayInputStream;\r
   4 import java.util.Arrays;\r
   5 \r
   6 import org.eclipse.jface.resource.ImageDescriptor;\r
   7 import org.eclipse.jface.resource.ResourceManager;\r
   8 import org.eclipse.swt.events.SelectionEvent;\r
   9 import org.eclipse.swt.events.SelectionListener;\r
  10 import org.eclipse.swt.graphics.ImageData;\r
  11 import org.eclipse.swt.graphics.ImageLoader;\r
  12 import org.eclipse.swt.widgets.Button;\r
  13 import org.eclipse.swt.widgets.Composite;\r
  14 import org.simantics.scl.runtime.function.Function1;\r
  15 import org.simantics.views.swt.client.base.SingleSWTViewNode;\r
  16 \r
  17 public class SWTButton extends SingleSWTViewNode<Button> {\r
  18         \r
  19         private static final long serialVersionUID = 7932335224632082902L;\r
  20 \r
  21         public Function1<Object, Object> modifier;\r
  22         public byte[] image;\r
  23         public String tooltip;\r
  24 \r
  25         private transient ImageDescriptor imageDesc;\r
  26 \r
  27         @Override\r
  28         public void createControls(Composite parent) {\r
  29                 \r
  30                 control = new Button(parent, style);\r
  31 \r
  32                 setProperties();\r
  33 \r
  34                 control.addSelectionListener(new SelectionListener() {\r
  35 \r
  36                         @Override\r
  37                         public void widgetSelected(SelectionEvent e) {\r
  38                                 if(modifier != null)\r
  39                                         modifier.apply(SWTButton.this);\r
  40                         }\r
  41 \r
  42                         @Override\r
  43                         public void widgetDefaultSelected(SelectionEvent e) {\r
  44                                 widgetSelected(e);\r
  45                         }\r
  46                         \r
  47                 });\r
  48                 \r
  49         }\r
  50         \r
  51         @Override\r
  52         public void synchronizeText(String text) {\r
  53                 if(text != null) {\r
  54                         control.setText(text);\r
  55                         // This seems to be necessary for correct size computations\r
  56                         control.getParent().layout(true);\r
  57                 }\r
  58         }\r
  59 \r
  60         public void synchronizeImage(byte[] image) {\r
  61                 ResourceManager rm =  getResourceManager();\r
  62                 ImageDescriptor oldDesc = imageDesc;\r
  63                 if (image != null)\r
  64                         control.setImage(rm.createImage(imageDesc = new Descriptor(image)));\r
  65                 if (oldDesc != null)\r
  66                         rm.destroyImage(oldDesc);\r
  67         }\r
  68         \r
  69         public void synchronizeModifier(Function1<Object, Object> modifier) {\r
  70                 \r
  71         }\r
  72         \r
  73         public void synchronizeTooltip(String tooltip) {\r
  74                 if(tooltip != null) control.setToolTipText(tooltip);\r
  75         }\r
  76 \r
  77         static class Descriptor extends ImageDescriptor {\r
  78             \r
  79             final byte[] data;\r
  80             final int hash;\r
  81             \r
  82             public Descriptor(byte[] data) {\r
  83                 this.data = data;\r
  84                 this.hash = Arrays.hashCode(data);\r
  85             }\r
  86 \r
  87             @Override\r
  88             public ImageData getImageData() {\r
  89                 return new ImageLoader().load(new ByteArrayInputStream(data))[0];\r
  90             }\r
  91 \r
  92             @Override\r
  93             public int hashCode() {\r
  94                 return hash;\r
  95             }\r
  96 \r
  97             @Override\r
  98             public boolean equals(Object obj) {\r
  99                 if (this == obj)\r
 100                     return true;\r
 101                 if (obj == null)\r
 102                     return false;\r
 103                 if (getClass() != obj.getClass())\r
 104                     return false;\r
 105                 Descriptor other = (Descriptor) obj;\r
 106                 if (!Arrays.equals(data, other.data))\r
 107                     return false;\r
 108                 return true;\r
 109             }\r
 110 \r
 111         }\r
 112 \r
 113 }\r