107 lines
3.4 KiB
Java
107 lines
3.4 KiB
Java
/*
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* AppleCommander - An Apple ][ image utility.
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* Copyright (C) 2002 by Robert Greene
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* robgreene at users.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package com.webcodepro.applecommander.ui.swt;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.events.SelectionAdapter;
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import org.eclipse.swt.events.SelectionEvent;
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import org.eclipse.swt.graphics.Point;
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import org.eclipse.swt.graphics.Rectangle;
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import org.eclipse.swt.widgets.Menu;
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import org.eclipse.swt.widgets.MenuItem;
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import org.eclipse.swt.widgets.ToolBar;
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import org.eclipse.swt.widgets.ToolItem;
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/**
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* Listens to widgetSelected() events on SWT.DROP_DOWN type ToolItems
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* and opens/closes a menu when appropriate.
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* Code taken and modified from SWT examples to be more generic.
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* <p>
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* Date created: Nov 2, 2002 8:25:11 PM
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* @author: Rob Greene
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*/
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public class DropDownSelectionListener extends SelectionAdapter {
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private Menu menu = null;
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private boolean visible = false;
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/**
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* Construct the DropDownSelectionListener with the specific menu to be used.
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*/
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public DropDownSelectionListener(Menu menu) {
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this.menu = menu;
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MenuItem[] menuItems = menu.getItems();
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for (int i=0; i<menuItems.length; i++) {
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/*
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* Add a menu selection listener so that the menu is hidden
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* when the user selects an item from the drop down menu.
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*/
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menuItems[i].addSelectionListener(new SelectionAdapter() {
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public void widgetSelected(SelectionEvent e) {
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setMenuVisible(false);
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}
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});
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}
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}
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/**
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* Handle selection events.
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*/
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public void widgetSelected(SelectionEvent event) {
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/**
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* A selection event will be fired when a drop down tool
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* item is selected in the main area and in the drop
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* down arrow. Examine the event detail to determine
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* where the widget was selected.
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*/
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if (event.detail == SWT.ARROW) {
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/*
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* The drop down arrow was selected.
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*/
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if (visible) {
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// Hide the menu to give the Arrow the appearance of being a toggle button.
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setMenuVisible(false);
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} else {
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// Position the menu below and vertically aligned with the the drop down tool button.
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final ToolItem toolItem = (ToolItem) event.widget;
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final ToolBar toolBar = toolItem.getParent();
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Rectangle toolItemBounds = toolItem.getBounds();
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Point point = toolBar.toDisplay(new Point(toolItemBounds.x, toolItemBounds.y));
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menu.setLocation(point.x, point.y + toolItemBounds.height);
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setMenuVisible(true);
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}
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} else {
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/*
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* Main area of drop down tool item selected.
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* An application would invoke the code to perform the action for the tool item.
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*/
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}
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}
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/**
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* Set menu visibility and track state.
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*/
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private void setMenuVisible(boolean visible) {
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menu.setVisible(visible);
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this.visible = visible;
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}
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}
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