com.google.livingstories.client.ui.RichTextEditor.java Source code

Introduction

Here is the source code for com.google.livingstories.client.ui.RichTextEditor.java

Source

/**
 * Copyright 2010 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.livingstories.client.ui;

import com.google.gwt.event.logical.shared.BeforeSelectionEvent;
import com.google.gwt.event.logical.shared.BeforeSelectionHandler;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.RichTextArea;
import com.google.gwt.user.client.ui.TabPanel;
import com.google.gwt.user.client.ui.TextArea;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.livingstories.client.ui.richtexttoolbar.RichTextToolbar;

/**
 * A TabPanel that has tabs for editing the same content either in rich-text mode or in HTML mode.
 * The rich text mode consists of a {@link RichTextToolbar} and a {@link RichTextArea}. The
 * HTML mode just consists of a {@link TextArea}.
 */
public class RichTextEditor extends Composite {
    private static final int EDITOR_WIDTH = 650;

    private TabPanel tabPanel;
    private TextArea textArea;
    private RichTextArea richTextArea;
    private VerticalPanel richTextVerticalPanel;

    public RichTextEditor() {
        super();
        this.tabPanel = new TabPanel();
        tabPanel.setWidth((EDITOR_WIDTH + 15) + "px");
        createEditor();

        initWidget(tabPanel);
    }

    private void createEditor() {
        richTextVerticalPanel = new VerticalPanel();
        populateRichTextVerticalPanel();

        textArea = new TextArea();
        textArea.setWidth(EDITOR_WIDTH + "px");
        textArea.setVisibleLines(20);

        tabPanel.add(richTextVerticalPanel, "Rich Text");
        tabPanel.add(textArea, "HTML");
        tabPanel.selectTab(0);
        // When the tabs are switched, populate the edits in the content from the current tab to the
        // other one.
        tabPanel.getTabBar().addBeforeSelectionHandler(new BeforeSelectionHandler<Integer>() {
            public void onBeforeSelection(BeforeSelectionEvent<Integer> event) {
                if (event.getItem() == 0) {
                    // This is a workaround for some bugs in RichTextArea. It is necessary to create a new
                    // RichTextArea when selecting this tab because once the RichTextArea loses focus to the
                    // other TextArea, it does not get focus back. The cursor is lost and all the toggle 
                    // buttons are depressed. See post on GWT-users titled "Weird behavior in RichTextArea"
                    // for details.
                    populateRichTextVerticalPanel();
                    richTextArea.setHTML(textArea.getText());
                } else {
                    textArea.setText(richTextArea.getHTML());
                }
            }
        });
    }

    /**
     * Create a RichTextArea and a toolbar connected to it and add them to the VerticalPanel.
     */
    private void populateRichTextVerticalPanel() {
        richTextArea = new RichTextArea();
        richTextArea.setSize(EDITOR_WIDTH + "px", "300px");

        RichTextToolbar richTextToolbar = new RichTextToolbar(richTextArea);
        richTextToolbar.setWidth(EDITOR_WIDTH + "px");

        richTextVerticalPanel.clear();
        richTextVerticalPanel.add(richTextToolbar);
        richTextVerticalPanel.add(richTextArea);
    }

    public void setContent(String content) {
        richTextArea.setHTML(content);
        textArea.setText(content);
    }

    /**
     * Return the HTML from the currently selected tab.
     */
    public String getContent() {
        if (tabPanel.getTabBar().getSelectedTab() == 1) {
            return textArea.getText();
        } else {
            return richTextArea.getHTML();
        }
    }

    @Override
    public void setHeight(String height) {
        textArea.setHeight(height);
        richTextArea.setHeight(height);
    }
}