net.s17fabu.vip.gwt.showcase.client.content.text.CwBasicText.java Source code

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Here is the source code for net.s17fabu.vip.gwt.showcase.client.content.text.CwBasicText.java

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/*
 * Copyright 2008 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 net.s17fabu.vip.gwt.showcase.client.content.text;

import net.s17fabu.vip.gwt.showcase.client.ContentWidget;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.i18n.client.Constants;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.PasswordTextBox;
import com.google.gwt.user.client.ui.TextArea;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.TextBoxBase;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * Example file.
 */
public class CwBasicText extends ContentWidget {
    /**
     * The constants used in this Content Widget.
     */
    public static interface CwConstants extends Constants, ContentWidget.CwConstants {
        String cwBasicTextAreaLabel();

        String cwBasicTextDescription();

        String cwBasicTextName();

        String cwBasicTextNormalLabel();

        String cwBasicTextPasswordLabel();

        String cwBasicTextReadOnly();

        String cwBasicTextSelected();
    }

    /**
     * An instance of the constants.
     */
    private CwConstants constants;

    /**
     * Constructor.
     * 
     * @param constants the constants
     */
    public CwBasicText(CwConstants constants) {
        super(constants);
        this.constants = constants;
    }

    @Override
    public String getDescription() {
        return constants.cwBasicTextDescription();
    }

    @Override
    public String getName() {
        return constants.cwBasicTextName();
    }

    /**
     * Initialize this example.
     */
    @Override
    public Widget onInitialize() {
        // Create a panel to layout the widgets
        VerticalPanel vpanel = new VerticalPanel();
        vpanel.setSpacing(5);

        // Add a normal and disabled text box
        TextBox normalText = new TextBox();
        normalText.ensureDebugId("cwBasicText-textbox");
        TextBox disabledText = new TextBox();
        disabledText.ensureDebugId("cwBasicText-textbox-disabled");
        disabledText.setText(constants.cwBasicTextReadOnly());
        disabledText.setEnabled(false);
        vpanel.add(new HTML(constants.cwBasicTextNormalLabel()));
        vpanel.add(createTextExample(normalText, true));
        vpanel.add(createTextExample(disabledText, false));

        // Add a normal and disabled password text box
        PasswordTextBox normalPassword = new PasswordTextBox();
        normalPassword.ensureDebugId("cwBasicText-password");
        PasswordTextBox disabledPassword = new PasswordTextBox();
        disabledPassword.ensureDebugId("cwBasicText-password-disabled");
        disabledPassword.setText(constants.cwBasicTextReadOnly());
        disabledPassword.setEnabled(false);
        vpanel.add(new HTML("<br><br>" + constants.cwBasicTextPasswordLabel()));
        vpanel.add(createTextExample(normalPassword, true));
        vpanel.add(createTextExample(disabledPassword, false));

        // Add a text area
        TextArea textArea = new TextArea();
        textArea.ensureDebugId("cwBasicText-textarea");
        textArea.setVisibleLines(5);
        vpanel.add(new HTML("<br><br>" + constants.cwBasicTextAreaLabel()));
        vpanel.add(createTextExample(textArea, true));

        // Return the panel
        return vpanel;
    }

    /**
     * Create a TextBox example that includes the text box and an optional
     * handler that updates a Label with the currently selected text.
     * 
     * @param textBox the text box to handle
     * @param addSelection add handlers to update label
     * @return the Label that will be updated
     */
    private HorizontalPanel createTextExample(final TextBoxBase textBox, boolean addSelection) {
        // Add the text box and label to a panel
        HorizontalPanel hPanel = new HorizontalPanel();
        hPanel.setSpacing(4);
        hPanel.add(textBox);

        // Add handlers
        if (addSelection) {
            // Create the new label
            final Label label = new Label(constants.cwBasicTextSelected() + ": 0, 0");

            // Add a KeyUpHandler
            textBox.addKeyUpHandler(new KeyUpHandler() {
                public void onKeyUp(KeyUpEvent event) {
                    updateSelectionLabel(textBox, label);
                }
            });

            // Add a ClickHandler
            textBox.addClickHandler(new ClickHandler() {
                public void onClick(ClickEvent event) {
                    updateSelectionLabel(textBox, label);
                }
            });

            // Add the label to the box
            hPanel.add(label);
        }

        // Return the panel
        return hPanel;
    }

    /**
     * Update the text in one of the selection labels.
     * 
     * @param textBox the text box
     * @param label the label to update
     */
    private void updateSelectionLabel(TextBoxBase textBox, Label label) {
        label.setText(constants.cwBasicTextSelected() + ": " + textBox.getCursorPos() + ", "
                + textBox.getSelectionLength());
    }
}