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// Copyright 2007 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"); You may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
// applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
// OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.
package com.google.scrollview.ui;
import com.google.scrollview.events.SVEventType;
import com.google.scrollview.ui.SVMenuItem;
import com.google.scrollview.ui.SVWindow;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import javax.swing.JMenu;
import javax.swing.JPopupMenu;
/**
* The SVPopupMenu class provides the functionality to add a popup menu to
* ScrollView. Each popup menu item gets associated with a (client-defined)
* command-id, which SVPopupMenu will return upon clicking it.
*
* @author wanke@google.com
*
*/
public class SVPopupMenu implements ActionListener {
/** The root entry to add items to. */
private JPopupMenu root;
/** Contains a map of item name to its actual entry. */
private HashMap<String, SVAbstractMenuItem> items;
/** The window the menubar belongs to. */
private SVWindow svWindow;
/**
* Create a new SVPopupMenu and associate it with a ScrollView window.
*
* @param sv The window our popup menu belongs to.
*/
SVPopupMenu(SVWindow sv) {
root = new JPopupMenu();
svWindow = sv;
items = new HashMap<String, SVAbstractMenuItem>();
}
/**
* Add a new entry to the menubar. For these items, the server will poll the
* client to ask what to do.
*
* @param parent The menu we add our new entry to (should have been defined
* before). If the parent is "", we will add the entry to the root
* (top-level).
* @param name The caption of the new entry.
* @param id The Id of the new entry. If it is -1, the entry will be treated
* as a menu.
*/
public void add(String parent, String name, int id) {
// A duplicate entry - we just throw it away, since its already in.
if (items.get(name) != null) { return; }
// A new submenu at the top-level.
if (parent.equals("")) {
JMenu jli = new JMenu(name);
SVAbstractMenuItem mli = new SVSubMenuItem(name, jli);
items.put(name, mli);
root.add(jli);
}
// A new sub-submenu.
else if (id == -1) {
SVAbstractMenuItem jmi = items.get(parent);
JMenu jli = new JMenu(name);
SVAbstractMenuItem mli = new SVSubMenuItem(name, jli);
items.put(name, mli);
jmi.add(jli);
}
// A new child entry. Add to appropriate parent.
else {
SVAbstractMenuItem jmi = items.get(parent);
if (jmi == null) {
System.out.println("ERROR: Unknown parent " + parent);
System.exit(1);
}
SVAbstractMenuItem mli = new SVEmptyMenuItem(id, name);
mli.mi.addActionListener(this);
items.put(name, mli);
jmi.add(mli);
}
}
/**
* Add a new entry to the menubar. In this case, we also know its value and
* possibly even have a description. For these items, the server will not poll
* the client to ask what to do, but just show an input dialog and send a
* message with the new value.
*
* @param parent The menu we add our new entry to (should have been defined
* before). If the parent is "", we will add the entry to the root
* (top-level).
* @param name The caption of the new entry.
* @param id The Id of the new entry. If it is -1, the entry will be treated
* as a menu.
* @param value The value of the new entry.
* @param desc The description of the new entry.
*/
public void add(String parent, String name, int id, String value, String desc) {
SVAbstractMenuItem jmi = items.get(parent);
SVMenuItem mli = new SVMenuItem(id, name, value, desc);
mli.mi.addActionListener(this);
items.put(name, mli);
if (jmi == null) { // add to root
root.add(mli.mi);
} else { // add to parent
jmi.add(mli);
}
}
/**
* A click on one of the items in our menubar has occurred. Forward it
* to the item itself to let it decide what happens.
*/
public void actionPerformed(ActionEvent e) {
// Get the corresponding menuitem
SVAbstractMenuItem svm = items.get(e.getActionCommand());
svm.performAction(svWindow, SVEventType.SVET_POPUP);
}
/**
* Gets called by the SVEventHandler of the window to actually show the
* content of the popup menu.
*/
public void show(Component Invoker, int x, int y) {
root.show(Invoker, x, y);
}
}
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