com.google.gwt.widgetideas.demo.collapsiblepanel.client.CollapsiblePanelDemo.java Source code

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Here is the source code for com.google.gwt.widgetideas.demo.collapsiblepanel.client.CollapsiblePanelDemo.java

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/*
 * Copyright 2007 Google Inc.
 * 
 * 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.gwt.widgetideas.demo.collapsiblepanel.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.libideas.logging.shared.Log;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Window.Location;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.StackPanel;
import com.google.gwt.user.client.ui.ToggleButton;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.widgetideas.client.CollapsiblePanel;
import com.google.gwt.widgetideas.client.FastTree;
import com.google.gwt.widgetideas.client.FastTreeItem;

import java.util.ArrayList;

/**
 * {@link CollapsiblePanel} demo.
 */
public class CollapsiblePanelDemo implements EntryPoint {

    /**
     * A special purpose widget to allow scrollable stack panels.
     */
    public class MyStackPanel extends StackPanel {
        private ArrayList<Widget> scrollers = new ArrayList<Widget>();

        public void insert(Widget w, int before) {
            ScrollPanel p = new ScrollPanel(w);
            p.setWidth("100%");
            scrollers.add(before, p);
            super.insert(p, before);
        }

        public void onLoad() {
            setWidth("100%");
            showStack(getSelectedIndex());
        }

        /**
         * Shows the widget at the specified child index.
         * 
         * @param index the index of the child to be shown
         */
        public void showStack(int index) {
            super.showStack(index);

            if (this.isAttached()) {
                ScrollPanel me = (ScrollPanel) scrollers.get(index);
                me.setHeight("1px");
                Element tr = DOM.getChild(DOM.getFirstChild(getElement()), index * 2 + 1);
                int trHeight = DOM.getElementPropertyInt(tr, "offsetHeight");
                me.setHeight(trHeight + "px");
            }
        }
    }

    ToggleButton controlButton;

    /**
     * This is the entry point method.
     */
    public void onModuleLoad() {
        try {

            // Some random contents to make the tree interesting.
            Panel contents = createSchoolNavBar();
            FastTree.addDefaultCSS();

            // The panel.
            final CollapsiblePanel panel = new CollapsiblePanel();
            String value = Location.getParameter("collapsed");
            if (value != null) {
                value = value.trim();
                if (value.equals("true")) {
                    panel.setCollapsedState(true);
                } else if (value.equals("false")) {
                    // do nothing, default.
                } else {
                    Window.alert("collapsed should not be given " + value + " use true or false instead");
                }
            }
            RootPanel.get("collapsible-panel").add(panel);
            panel.add(contents);
            panel.setWidth("200px");
            panel.hookupControlToggle(controlButton);
        } catch (RuntimeException e) {
            if (GWT.isScript()) {
                Log.severe(e.getMessage());
            }
            throw e;
        }
    }

    private Panel createSchoolNavBar() {
        ToggleButton toggler = new ToggleButton("Directory (click to pin)", "Directory (click to collapse)");
        toggler.setStyleName("CollapsibleToggle");
        controlButton = toggler;

        MyStackPanel wrapper = new MyStackPanel();
        FlowPanel navBar = new FlowPanel();
        navBar.setSize("200px", "100%");

        HorizontalPanel panel = new HorizontalPanel();
        panel.setWidth("100%");

        panel.setCellHorizontalAlignment(controlButton, HasHorizontalAlignment.ALIGN_LEFT);

        panel.add(controlButton);
        panel.setCellWidth(controlButton, "1px");
        panel.setCellHorizontalAlignment(controlButton, HorizontalPanel.ALIGN_CENTER);

        navBar.add(panel);

        panel.setStyleName("nav-Tree-title");
        wrapper = new MyStackPanel();
        wrapper.setHeight("250px");

        final FastTree contents = new FastTree();
        wrapper.add(contents, "<b>People</b>", true);

        wrapper.add(new Label("None"), "<b>Academics</b>", true);
        navBar.add(wrapper);

        FastTreeItem students = contents.addItem("Students");
        students.addItem("Jill");
        students.addItem("Jack");
        students.addItem("Molly");
        students.addItem("Ms. Muffat");

        FastTreeItem teachers = contents.addItem("Teachers");
        teachers.addItem("Mrs Black");
        teachers.addItem("Mr White");

        FastTreeItem admin = contents.addItem("Administrators");
        admin.addItem("The Soup Nazi");
        admin.addItem("The Grand High Supreme Master Pubba");
        return navBar;
    }
}