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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.user.client.ui;

import com.google.gwt.editor.client.IsEditor;
import com.google.gwt.editor.client.LeafValueEditor;
import com.google.gwt.editor.client.adapters.TakesValueEditor;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;

/**
 * A ToggleButton is a stylish stateful button which allows the
 * user to toggle between up and down states.
 * 
 * 

* *

* *

CSS Style Rules

*
    *
  • * .gwt-ToggleButton-up/down/up-hovering/down-hovering/up-disabled/down-disabled * {.html-face}
  • *
* *

*

Example

{@example com.google.gwt.examples.ToggleButtonExample} *

*/ public class ToggleButton extends CustomButton implements HasValue, IsEditor> { private static String STYLENAME_DEFAULT = "gwt-ToggleButton"; private LeafValueEditor editor; { setStyleName(STYLENAME_DEFAULT); } /** * Constructor for ToggleButton. */ public ToggleButton() { super(); } /** * Constructor for ToggleButton. The supplied image is used to * construct the default face. * * @param upImage image for the default face of the button */ public ToggleButton(Image upImage) { super(upImage); } /** * Constructor for ToggleButton. The supplied image is used to * construct the default face of the button. * * @param upImage image for the default (up) face of the button * @param handler the click handler */ public ToggleButton(Image upImage, ClickHandler handler) { super(upImage, handler); } /** * Constructor for ToggleButton. The supplied image is used to * construct the default face of the button. * * @param upImage image for the default (up) face of the button * @param listener the click listener * @deprecated Use {@link #ToggleButton(Image, ClickHandler)} instead */ @Deprecated public ToggleButton(Image upImage, ClickListener listener) { super(upImage, listener); } /** * Constructor for ToggleButton. * * @param upImage image for the default(up) face of the button * @param downImage image for the down face of the button */ public ToggleButton(Image upImage, Image downImage) { super(upImage, downImage); } /** * Constructor for ToggleButton. * * @param upImage image for the default(up) face of the button * @param downImage image for the down face of the button * @param handler the click handler */ public ToggleButton(Image upImage, Image downImage, ClickHandler handler) { super(upImage, downImage, handler); } /** * Constructor for ToggleButton. * * @param upImage image for the default(up) face of the button * @param downImage image for the down face of the button * @param listener clickListener * @deprecated Use {@link #ToggleButton(Image, Image, ClickHandler)} instead */ @Deprecated public ToggleButton(Image upImage, Image downImage, ClickListener listener) { super(upImage, downImage, listener); } /** * Constructor for ToggleButton. The supplied text is used to * construct the default face of the button. * * @param upText the text for the default (up) face of the button. */ public ToggleButton(String upText) { super(upText); } /** * Constructor for ToggleButton. The supplied text is used to * construct the default face of the button. * * @param upText the text for the default (up) face of the button * @param handler the click handler */ public ToggleButton(String upText, ClickHandler handler) { super(upText, handler); } /** * Constructor for ToggleButton. The supplied text is used to * construct the default face of the button. * * @param upText the text for the default (up) face of the button * @param listener the click listener * @deprecated Use {@link #ToggleButton(String, ClickHandler)} instead */ @Deprecated public ToggleButton(String upText, ClickListener listener) { super(upText, listener); } /** * Constructor for ToggleButton. * * @param upText the text for the default (up) face of the button * @param downText the text for down face of the button */ public ToggleButton(String upText, String downText) { super(upText, downText); } /** * Constructor for ToggleButton. * * @param upText the text for the default (up) face of the button * @param downText the text for down face of the button * @param handler the click handler */ public ToggleButton(String upText, String downText, ClickHandler handler) { super(upText, downText, handler); } public HandlerRegistration addValueChangeHandler( ValueChangeHandler handler) { return addHandler(handler, ValueChangeEvent.getType()); } public LeafValueEditor asEditor() { if (editor == null) { editor = TakesValueEditor.of(this); } return editor; } /** * Determines whether this button is currently down. * * @return true if the button is pressed, false otherwise. Will * not return null */ public Boolean getValue() { return isDown(); } @Override public boolean isDown() { // Changes access to public. return super.isDown(); } /** * {@inheritDoc} Does not fire {@link ValueChangeEvent}. (If you want the * event to fire, use {@link #setValue(Boolean, boolean)}) */ @Override public void setDown(boolean down) { // Changes access to public. super.setDown(down); } /** * Sets whether this button is down. * * @param value true to press the button, false otherwise; null value implies * false */ public void setValue(Boolean value) { setValue(value, false); } /** * Sets whether this button is down, firing {@link ValueChangeEvent} if * appropriate. * * @param value true to press the button, false otherwise; null value implies * false * @param fireEvents If true, and value has changed, fire a * {@link ValueChangeEvent} */ public void setValue(Boolean value, boolean fireEvents) { if (value == null) { value = Boolean.FALSE; } boolean oldValue = fireEvents ? isDown() : false; setDown(value); if (fireEvents) { ValueChangeEvent.fireIfNotEqual(this, oldValue, value); } } @Override protected void onClick() { toggleDown(); super.onClick(); ValueChangeEvent.fire(this, isDown()); } }




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