plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/util/DropDownMenu.java

   1 package net.mograsim.plugin.util;
   2
   3 import org.eclipse.swt.SWT;
   4 import org.eclipse.swt.events.SelectionEvent;
   5 import org.eclipse.swt.events.SelectionListener;
   6 import org.eclipse.swt.graphics.Point;
   7 import org.eclipse.swt.graphics.Rectangle;
   8 import org.eclipse.swt.widgets.Button;
   9 import org.eclipse.swt.widgets.Composite;
  10 import org.eclipse.swt.widgets.Event;
  11 import org.eclipse.swt.widgets.Listener;
  12 import org.eclipse.swt.widgets.Menu;
  13 import org.eclipse.swt.widgets.MenuItem;
  14
  15 public class DropDownMenu
  16 {
  17         private Button button;
  18
  19         public DropDownMenu(Composite parent, String label, DropDownEntry... entries)
  20         {
  21                 button = new Button(parent, SWT.PUSH);
  22                 button.setText(label);
  23                 setupDrowpDownMenu(entries);
  24         }
  25
  26         private void setupDrowpDownMenu(DropDownEntry[] entries)
  27         {
  28                 Menu menu = new Menu(button);
  29                 for (DropDownEntry entry : entries)
  30                 {
  31                         MenuItem item = new MenuItem(menu, SWT.PUSH);
  32                         item.addSelectionListener(new SelectionListener()
  33                         {
  34                                 @Override
  35                                 public void widgetSelected(SelectionEvent e)
  36                                 {
  37                                         entry.listener.widgetSelected(e);
  38                                 }
  39
  40                                 @Override
  41                                 public void widgetDefaultSelected(SelectionEvent e)
  42                                 {
  43                                         widgetSelected(e);
  44                                 }
  45                         });
  46                         item.setText(entry.title);
  47                 }
  48
  49                 button.addListener(SWT.Selection, new Listener()
  50                 {
  51                         @Override
  52                         public void handleEvent(Event event)
  53                         {
  54                                 Rectangle rect = button.getBounds();
  55                                 Point pt = new Point(rect.x, rect.y + rect.height);
  56                                 pt = button.getParent().toDisplay(pt);
  57                                 menu.setLocation(pt.x, pt.y);
  58                                 menu.setVisible(true);
  59                         }
  60                 });
  61         }
  62
  63         public Button getButton()
  64         {
  65                 return button;
  66         }
  67
  68         public static class DropDownEntry
  69         {
  70                 public final String title;
  71                 public final EntrySelectedListener listener;
  72
  73                 public DropDownEntry(String title, EntrySelectedListener listener)
  74                 {
  75                         super();
  76                         this.title = title;
  77                         this.listener = listener;
  78                 }
  79         }
  80
  81         @FunctionalInterface
  82         public static interface EntrySelectedListener
  83         {
  84                 public void widgetSelected(SelectionEvent e);
  85         }
  86 }