// Copyright © 2014 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System.Collections.Generic;
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using CefSharp.Enums;
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namespace CefSharp
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{
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/// <summary>
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/// Implement this interface to handle events related to dragging.
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/// The methods of this class will be called on the UI thread.
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/// </summary>
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public interface IDragHandler
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{
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/// <summary>
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/// Called when an external drag event enters the browser window.
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/// </summary>
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/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
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/// <param name="browser">the browser object</param>
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/// <param name="dragData">contains the drag event data</param>
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/// <param name="mask">represents the type of drag operation</param>
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/// <returns>Return false for default drag handling behavior or true to cancel the drag event. </returns>
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bool OnDragEnter(IWebBrowser chromiumWebBrowser, IBrowser browser, IDragData dragData, DragOperationsMask mask);
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/// <summary>
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/// Called whenever draggable regions for the browser window change.
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/// These can be specified using the '-webkit-app-region: drag/no-drag' CSS-property.
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/// If draggable regions are never defined in a document this method will also never be called.
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/// If the last draggable region is removed from a document this method will be called with an empty IList.
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/// </summary>
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/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
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/// <param name="browser">the browser object</param>
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/// <param name="frame">The frame</param>
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/// <param name="regions">List of <see cref="DraggableRegion"/> objects or null if last region was removed.</param>
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void OnDraggableRegionsChanged(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IList<DraggableRegion> regions);
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}
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}
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