asquare.gwt.sb.client.fw.ActionButton.java Source code

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Here is the source code for asquare.gwt.sb.client.fw.ActionButton.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.sb.client.fw;

import asquare.gwt.sb.client.util.Action;
import asquare.gwt.sb.client.util.ActionPropertyListener;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.Button;

public class ActionButton extends Button implements ActionPropertyListener {
    private Action m_action;

    public ActionButton() {
        this(null);
    }

    public ActionButton(Action action) {
        sinkEvents(Event.ONCLICK);
        setAction(action);
    }

    public Action getAction() {
        return m_action;
    }

    public void setAction(Action action) {
        if (m_action != null) {
            m_action.removeListener(this);
        }
        m_action = action;
        if (m_action != null) {
            m_action.addListener(this);
        }
        updateState();
    }

    private void updateState() {
        String text;
        boolean enabled;
        if (m_action != null) {
            text = m_action.getUIString();
            enabled = m_action.isEnabled();
        } else {
            text = "";
            enabled = false;
        }
        setText(text);
        setEnabled(enabled);
    }

    @Override
    public void onBrowserEvent(Event event) {
        super.onBrowserEvent(event);
        if (DOM.eventGetType(event) == Event.ONCLICK) {
            m_action.execute();
        }
    }

    // ActionPropertyListener methods
    public void actionPropertiesChanged(Action m_action) {
        updateState();
    }
}