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.graphics.Point;
   5 import org.eclipse.swt.graphics.Rectangle;
   6 import org.eclipse.swt.widgets.Button;
   7 import org.eclipse.swt.widgets.Composite;
   8 import org.eclipse.swt.widgets.Menu;
   9 import org.eclipse.swt.widgets.MenuItem;
  10
  11 public class DropDownMenu
  12 {
  13         private Button button;
  14
  15         public DropDownMenu(Composite parent, String label, DropDownEntry... entries)
  16         {
  17                 button = new Button(parent, SWT.PUSH);
  18                 button.setText(label);
  19                 setupDrowpDownMenu(entries);
  20         }
  21
  22         private void setupDrowpDownMenu(DropDownEntry[] entries)
  23         {
  24                 Menu menu = new Menu(button);
  25                 for (DropDownEntry entry : entries)
  26                 {
  27                         MenuItem item = new MenuItem(menu, SWT.PUSH);
  28                         item.addListener(SWT.Selection, e -> entry.onSelected.run());
  29                         item.setText(entry.title);
  30                 }
  31
  32                 button.addListener(SWT.Selection, e ->
  33                 {
  34                         Rectangle rect = button.getBounds();
  35                         Point pt = new Point(rect.x, rect.y + rect.height);
  36                         pt = button.getParent().toDisplay(pt);
  37                         menu.setLocation(pt.x, pt.y);
  38                         menu.setVisible(true);
  39                 });
  40         }
  41
  42         public Button getButton()
  43         {
  44                 return button;
  45         }
  46
  47         public static class DropDownEntry
  48         {
  49                 public final String title;
  50                 public final Runnable onSelected;
  51
  52                 public DropDownEntry(String title, Runnable onSelected)
  53                 {
  54                         this.title = title;
  55                         this.onSelected = onSelected;
  56                 }
  57         }
  58 }