com.google.gwt.gen2.commonwidget.client.SimpleWidget.java Source code

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Here is the source code for com.google.gwt.gen2.commonwidget.client.SimpleWidget.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 com.google.gwt.gen2.commonwidget.client;

import com.google.gwt.dom.client.Element;
import com.google.gwt.gen2.commonwidget.client.impl.StandardCssImpl;
import com.google.gwt.gen2.event.dom.client.ClickEvent;
import com.google.gwt.gen2.event.dom.client.ClickHandler;
import com.google.gwt.gen2.event.dom.client.HasAllMouseHandlers;
import com.google.gwt.gen2.event.dom.client.HasClickHandlers;
import com.google.gwt.gen2.event.dom.client.MouseDownEvent;
import com.google.gwt.gen2.event.dom.client.MouseDownHandler;
import com.google.gwt.gen2.event.dom.client.MouseMoveEvent;
import com.google.gwt.gen2.event.dom.client.MouseMoveHandler;
import com.google.gwt.gen2.event.dom.client.MouseOutEvent;
import com.google.gwt.gen2.event.dom.client.MouseOutHandler;
import com.google.gwt.gen2.event.dom.client.MouseOverEvent;
import com.google.gwt.gen2.event.dom.client.MouseOverHandler;
import com.google.gwt.gen2.event.dom.client.MouseUpEvent;
import com.google.gwt.gen2.event.dom.client.MouseUpHandler;
import com.google.gwt.gen2.event.dom.client.MouseWheelEvent;
import com.google.gwt.gen2.event.dom.client.MouseWheelHandler;
import com.google.gwt.gen2.event.shared.HandlerRegistration;
import com.google.gwt.gen2.widgetbase.client.Gen2Widget;
import com.google.gwt.gen2.widgetbase.client.WidgetCss;
import com.google.gwt.user.client.DOM;

/**
 * Simple widget which wraps a single element and adds mouse and click events to
 * it.
 */
public class SimpleWidget extends Gen2Widget implements HasAllMouseHandlers, HasClickHandlers {

    /**
     * Css for simple widget.
     */
    public static interface Css extends WidgetCss {
        /**
         * Base name.
         */
        @ClassName("gwt-SimpleWidget")
        String simpleWidget();
    }

    /**
     * Standard Css for simple widget.
     */
    public static Css DEFAULT_CSS;
    private static Element translater;

    /**
     * Create the css for this widget with the given base name.
     */
    public static Css createCss(final String styleName) {
        class Standard extends StandardCssImpl implements Css {
            Standard() {
                super(styleName, "simpleWidget");
            }

            public String simpleWidget() {
                return getWidgetStyleName();
            }
        }
        return new Standard();
    }

    private static Element convertHtml(String html) {
        if (translater == null) {
            translater = DOM.createDiv();
        }
        translater.setInnerHTML(html);
        assert (translater.getChildNodes().getLength() == 1);
        Element e = translater.getFirstChildElement();
        translater.removeChild(e);
        return e;
    }

    private static Css ensureDefaultCss() {
        if (DEFAULT_CSS == null) {
            DEFAULT_CSS = createCss("gwt-SimpleWidget");
        }
        return DEFAULT_CSS;
    }

    /**
     * Constructor. The element passed in should not be attached to a parent and
     * should support mouse events and clicks.
     */
    public SimpleWidget(Element e) {
        this(e, ensureDefaultCss());
    }

    /**
     * Constructor. The element passed in should not be attached to a parent and
     * should support mouse events and clicks.
     */
    public SimpleWidget(Element e, Css css) {
        assert (e != null);
        assert (css != null);
        assert (e.getParentElement() == null);
        setElement(e);
        setStyleName(e, css.simpleWidget());
    }

    /**
     * Constructor. The html passed in to this constructor should represent a
     * single element and its children. The element, or one of its children,
     * should support click and mouse events.
     */
    public SimpleWidget(String html) {
        this(convertHtml(html), ensureDefaultCss());
    }

    /**
     * Constructor. The html passed in to this constructor should represent a
     * single element and its children. The element, or one of its children,
     * should support click and mouse events.
     */
    public SimpleWidget(String html, Css css) {
        this(convertHtml(html), css);
    }

    public HandlerRegistration addClickHandler(ClickHandler handler) {
        return addDomHandler(ClickEvent.TYPE, handler);
    }

    public HandlerRegistration addMouseDownHandler(MouseDownHandler handler) {
        return addDomHandler(MouseDownEvent.TYPE, handler);
    }

    public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler) {
        return addDomHandler(MouseMoveEvent.TYPE, handler);
    }

    public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) {
        return addDomHandler(MouseOutEvent.TYPE, handler);
    }

    public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) {
        return addDomHandler(MouseOverEvent.TYPE, handler);
    }

    public HandlerRegistration addMouseUpHandler(MouseUpHandler handler) {
        return addDomHandler(MouseUpEvent.TYPE, handler);
    }

    public HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler) {
        return addDomHandler(MouseWheelEvent.TYPE, handler);
    }
}