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

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