Source Code : Drop-down a chevron menu containing hidden tool items

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Drop-down a chevron menu containing hidden tool items

/*
 * CoolBar example snippet: drop-down a chevron menu containing hidden tool items
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.CoolBar;
import org.eclipse.swt.widgets.CoolItem;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;

public class Snippet140 {
  static Display display;

  static Shell shell;

  static CoolBar coolBar;

  static Menu chevronMenu = null;

  public static void main(String[] args) {
    display = new Display();
    shell = new Shell(display);
    shell.setLayout(new GridLayout());
    coolBar = new CoolBar(shell, SWT.FLAT | SWT.BORDER);
    coolBar.setLayoutData(new GridData(GridData.FILL_BOTH));
    ToolBar toolBar = new ToolBar(coolBar, SWT.FLAT | SWT.WRAP);
    int minWidth = 0;
    for (int j = 0; j < 5; j++) {
      int width = 0;
      ToolItem item = new ToolItem(toolBar, SWT.PUSH);
      item.setText("B" + j);
      width = item.getWidth();
      /* find the width of the widest tool */
      if (width > minWidth)
        minWidth = width;
    }
    CoolItem coolItem = new CoolItem(coolBar, SWT.DROP_DOWN);
    coolItem.setControl(toolBar);
    Point size = toolBar.computeSize(SWT.DEFAULT, SWT.DEFAULT);
    Point coolSize = coolItem.computeSize(size.x, size.y);
    coolItem.setMinimumSize(minWidth, coolSize.y);
    coolItem.setPreferredSize(coolSize);
    coolItem.setSize(coolSize);
    coolItem.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        if (event.detail == SWT.ARROW) {
          CoolItem item = (CoolItem) event.widget;
          Rectangle itemBounds = item.getBounds();
          Point pt = coolBar.toDisplay(new Point(itemBounds.x,
              itemBounds.y));
          itemBounds.x = pt.x;
          itemBounds.y = pt.y;
          ToolBar bar = (ToolBar) item.getControl();
          ToolItem[] tools = bar.getItems();

          int i = 0;
          while (i < tools.length) {
            Rectangle toolBounds = tools[i].getBounds();
            pt = bar
                .toDisplay(new Point(toolBounds.x, toolBounds.y));
            toolBounds.x = pt.x;
            toolBounds.y = pt.y;

            /*
             * Figure out the visible portion of the tool by looking
             * at the intersection of the tool bounds with the cool
             * item bounds.
             */
            Rectangle intersection = itemBounds
                .intersection(toolBounds);

            /*
             * If the tool is not completely within the cool item
             * bounds, then it is partially hidden, and all
             * remaining tools are completely hidden.
             */
            if (!intersection.equals(toolBounds))
              break;
            i++;
          }

          /*
           * Create a menu with items for each of the completely
           * hidden buttons.
           */
          if (chevronMenu != null)
            chevronMenu.dispose();
          chevronMenu = new Menu(coolBar);
          for (int j = i; j < tools.length; j++) {
            MenuItem menuItem = new MenuItem(chevronMenu, SWT.PUSH);
            menuItem.setText(tools[j].getText());
          }

          /*
           * Drop down the menu below the chevron, with the left edges
           * aligned.
           */
          pt = coolBar.toDisplay(new Point(event.x, event.y));
          chevronMenu.setLocation(pt.x, pt.y);
          chevronMenu.setVisible(true);
        }
      }
    });

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}


           
       

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