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GwtChosen is the GWT port of the Chosen javascript plugin that makes long, unwieldy select boxes much more user-friendly.

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/*
 * Copyright (C) 2012 Julien Dramaix
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.watopi.chosen.client.event;

import com.google.gwt.event.shared.EventHandler;
import com.watopi.chosen.client.ChosenImpl;

public class ShowingDropDownEvent extends ChosenEvent {
    public interface ShowingDropDownHandler extends EventHandler {
        void onShowingDropDown(ShowingDropDownEvent event);
    }

    public static Type TYPE = new Type();

    public static Type getType() {
        return TYPE;
    }

    public ShowingDropDownEvent(ChosenImpl chosen) {
        super(chosen);
    }

    @Override
    public Type getAssociatedType() {
        return TYPE;
    }

    @Override
    protected void dispatch(ShowingDropDownHandler handler) {
        handler.onShowingDropDown(this);
    }
}