com.google.gwt.cell.client.ButtonCell.java Source code

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Here is the source code for com.google.gwt.cell.client.ButtonCell.java

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/*
 * 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.gwt.cell.client;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.EventTarget;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.text.shared.SafeHtmlRenderer;
import com.google.gwt.text.shared.SimpleSafeHtmlRenderer;

/**
 * A {@link Cell} used to render a button.
 */
public class ButtonCell extends AbstractSafeHtmlCell<String> {

    /**
     * Construct a new ButtonCell that will use a {@link SimpleSafeHtmlRenderer}.
     */
    public ButtonCell() {
        this(SimpleSafeHtmlRenderer.getInstance());
    }

    /**
     * Construct a new ButtonCell that will use a given {@link SafeHtmlRenderer}.
     * 
     * @param renderer a {@link SafeHtmlRenderer SafeHtmlRenderer<String>} instance
     */
    public ButtonCell(SafeHtmlRenderer<String> renderer) {
        super(renderer, "click", "keydown");
    }

    @Override
    public void onBrowserEvent(Context context, Element parent, String value, NativeEvent event,
            ValueUpdater<String> valueUpdater) {
        super.onBrowserEvent(context, parent, value, event, valueUpdater);
        if ("click".equals(event.getType())) {
            EventTarget eventTarget = event.getEventTarget();
            if (!Element.is(eventTarget)) {
                return;
            }
            if (parent.getFirstChildElement().isOrHasChild(Element.as(eventTarget))) {
                // Ignore clicks that occur outside of the main element.
                onEnterKeyDown(context, parent, value, event, valueUpdater);
            }
        }
    }

    @Override
    public void render(Context context, SafeHtml data, SafeHtmlBuilder sb) {
        sb.appendHtmlConstant("<button type=\"button\" tabindex=\"-1\">");
        if (data != null) {
            sb.append(data);
        }
        sb.appendHtmlConstant("</button>");
    }

    @Override
    protected void onEnterKeyDown(Context context, Element parent, String value, NativeEvent event,
            ValueUpdater<String> valueUpdater) {
        if (valueUpdater != null) {
            valueUpdater.update(value);
        }
    }
}