/*
 * Copyright 2006 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 org.litesoft.GWT.client.widgets.nonpublic.external;

/**
 * An interface for implementing mouse actions.
 */
public abstract interface DragGesture
{
    /**
     * Called at beginning of the input operation. This may be triggered by a
     * mousedown, or may be triggered by a hotkey during the middle of a drag.
     */
    void start( MouseEvent event );

    /**
     * Called for each mouse movement during the input operation.
     */
    void step( DragEvent event );

    /**
     * Called at the end of the input operation, after the last movement. This
     * may be triggered by a mouseup or may be triggered by the release of a
     * hotkey during a drag.
     */
    void finish();
}