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// Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

package org.cef.handler;

import org.cef.browser.CefBrowser;
import org.cef.callback.CefDragData;

/**
 * Implement this interface to handle events related to dragging. The methods of
 * this class will be called on the UI thread.
 */
public interface CefDragHandler {
    /**
     *
     */
    public static final class DragOperationMask {
        public static final int DRAG_OPERATION_NONE = 0;
        public static final int DRAG_OPERATION_COPY = 1;
        public static final int DRAG_OPERATION_LINK = 2;
        public static final int DRAG_OPERATION_GENERIC = 4;
        public static final int DRAG_OPERATION_PRIVATE = 8;
        public static final int DRAG_OPERATION_MOVE = 16;
        public static final int DRAG_OPERATION_DELETE = 32;
        public static final int DRAG_OPERATION_EVERY = Integer.MAX_VALUE;
    }

    /**
     * Called when an external drag event enters the browser window.
     *
     * @param browser The corresponding browser.
     * @param dragData contains the drag event data
     * @param mask represents the type of drag operation. See DragOperationMask for possible values.
     * @return false for default drag handling behavior or true to
     * cancel the drag event.
     */
    public boolean onDragEnter(CefBrowser browser, CefDragData dragData, int mask);
}