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(); } }