asquare.gwt.tk.client.ui.behavior.EventBaseImpl.java Source code

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Here is the source code for asquare.gwt.tk.client.ui.behavior.EventBaseImpl.java

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/*
 * Copyright 2007 Mat Gessel <mat.gessel@gmail.com>
 * 
 * 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 asquare.gwt.tk.client.ui.behavior;

import java.util.EventObject;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.UIObject;
import com.google.gwt.user.client.ui.Widget;

public class EventBaseImpl extends EventObject implements EventBase {
    private static final long serialVersionUID = 1L;

    private final Event m_domEvent;
    private final Element m_target;
    private final int m_type;
    private final boolean m_previewPhase; // true if this event is in the preview cycle

    private boolean m_killPreviewEvent = false;

    protected EventBaseImpl(EventBaseImpl e) {
        super(e.getSource());
        m_domEvent = e.m_domEvent;
        m_target = e.m_target;
        m_type = e.m_type;
        m_previewPhase = e.m_previewPhase;
    }

    public EventBaseImpl(Widget source, Event domEvent, int type, boolean previewPhase) {
        super(source);
        m_domEvent = domEvent;
        m_target = DOM.eventGetTarget(domEvent);
        m_type = type;
        m_previewPhase = previewPhase;
    }

    /**
     * JDK15: change to override and narrow return type
     */
    public Widget getSourceWidget() {
        return (Widget) getSource();
    }

    public Event getDomEvent() {
        return m_domEvent;
    }

    public Element getTarget() {
        return m_target;
    }

    public Element getCurrentTarget() {
        return DOM.eventGetCurrentTarget(m_domEvent);
    }

    public int getType() {
        return m_type;
    }

    public boolean isPreviewPhase() {
        return m_previewPhase;
    }

    public boolean didEventOccurIn(UIObject uio) {
        return didEventOccurIn(uio.getElement());
    }

    public boolean didEventOccurIn(Element e) {
        return DOM.isOrHasChild(e, m_target);
    }

    public void killPreviewEvent() {
        if (!m_previewPhase)
            throw new IllegalStateException();

        m_killPreviewEvent = true;
    }

    public void stopPropagation() {
        if (m_previewPhase)
            throw new IllegalStateException();

        DOM.eventCancelBubble(m_domEvent, true);
    }

    public boolean isKillPreviewEvent() {
        return m_killPreviewEvent;
    }

    @Override
    public String toString() {
        return getPrettyName() + '[' + dumpProperties() + ']';
    }

    protected String getPrettyName() {
        return DOM.eventGetTypeString(m_domEvent);
    }

    protected String dumpProperties() {
        return "preview=" + m_previewPhase;
    }
}