org.utgenome.gwt.utgb.client.ui.tab.TabViewer.java Source code

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Here is the source code for org.utgenome.gwt.utgb.client.ui.tab.TabViewer.java

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/*--------------------------------------------------------------------------
 *  Copyright 2007 utgenome.org
 *
 *  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.
 *--------------------------------------------------------------------------*/
//--------------------------------------
// Aqua Project
//
// TabViewer.java
// Since: 2007/03/24
//
// $URL$ 
// $Author$
//--------------------------------------
package org.utgenome.gwt.utgb.client.ui.tab;

import java.util.ArrayList;

import org.utgenome.gwt.utgb.client.ui.tab.TabEntry.TabEntryFactory;

import com.google.gwt.event.logical.shared.BeforeSelectionEvent;
import com.google.gwt.event.logical.shared.BeforeSelectionHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.DockPanel;
import com.google.gwt.user.client.ui.TabBar;

/**
 * A TabViewer can have several TabEntry classes.
 * 
 * <code>
 * TabViewer v = new TabViewer();
 * v.addTabEntry(MyTab.factory());
 * v.addTabEntry(MyTab2.facory());
 * </code>
 * 
 * @author leo
 * 
 */
public class TabViewer extends Composite implements BeforeSelectionHandler<Integer>, SelectionHandler<Integer> {

    private ArrayList<TabEntryFactory> _tabEntryList = new ArrayList<TabEntryFactory>();
    private DockPanel _panel = new DockPanel();
    private TabBar _tabBar = new TabBar();
    private DockPanel _entryPanel = new DockPanel();

    public TabViewer() {
        _panel.add(_tabBar, DockPanel.NORTH);

        _tabBar.addSelectionHandler(this);
        _tabBar.addBeforeSelectionHandler(this);

        _panel.add(_entryPanel, DockPanel.CENTER);

        _panel.setWidth("100%");
        _entryPanel.setWidth("100%");

        initWidget(_panel);
    }

    public void selectTab(int index) {
        _tabBar.selectTab(index);
    }

    public void addTabEntry(final TabEntryFactory factory) {
        String name = factory.getTabName();
        _tabEntryList.add(factory);
        _tabBar.addTab(name);
    }

    public void onBeforeSelection(BeforeSelectionEvent<Integer> e) {

        TabEntryFactory factory = _tabEntryList.get(e.getItem());

        // calling focus events
        for (TabEntryFactory f : _tabEntryList) {
            if (f.equals(factory))
                continue; // skip the focused tab entry
            if (f.isInstanciated()) {
                f.getInstance().onLostFocus();
            }
        }
    }

    public void onSelection(SelectionEvent<Integer> e) {

        _entryPanel.clear();
        TabEntryFactory factory = _tabEntryList.get(e.getSelectedItem());
        TabEntry entry = factory.getInstance();
        _entryPanel.add(entry, DockPanel.CENTER);
        entry.onFocus();

    }
}