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Copy pathDragHandler .cs
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// Copyright © 2021 The CefSharp Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
using System.Collections.Generic;
using CefSharp.Enums;
namespace CefSharp.Handler
{
/// <summary>
/// Inherit from this class to handle events related to dragging.
/// The methods of this class will be called on the UI thread.
/// </summary>
public class DragHandler : IDragHandler
{
/// <summary>
/// Called when an external drag event enters the browser window.
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">the browser object</param>
/// <param name="dragData">contains the drag event data</param>
/// <param name="mask">represents the type of drag operation</param>
/// <returns>Return false for default drag handling behavior or true to cancel the drag event. </returns>
bool IDragHandler.OnDragEnter(IWebBrowser chromiumWebBrowser, IBrowser browser, IDragData dragData, DragOperationsMask mask)
{
return OnDragEnter(chromiumWebBrowser, browser, dragData, mask);
}
/// <summary>
/// Called when an external drag event enters the browser window.
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">the browser object</param>
/// <param name="dragData">contains the drag event data</param>
/// <param name="mask">represents the type of drag operation</param>
/// <returns>Return false for default drag handling behavior or true to cancel the drag event. </returns>
protected virtual bool OnDragEnter(IWebBrowser chromiumWebBrowser, IBrowser browser, IDragData dragData, DragOperationsMask mask)
{
return false;
}
/// <summary>
/// Called whenever draggable regions for the browser window change.
/// These can be specified using the '-webkit-app-region: drag/no-drag' CSS-property.
/// If draggable regions are never defined in a document this method will also never be called.
/// If the last draggable region is removed from a document this method will be called with an empty IList.
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">the browser object</param>
/// <param name="frame">The frame</param>
/// <param name="regions">List of <see cref="DraggableRegion"/> objects or null if last region was removed.</param>
void IDragHandler.OnDraggableRegionsChanged(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IList<DraggableRegion> regions)
{
OnDraggableRegionsChanged(chromiumWebBrowser, browser, frame, regions);
}
/// <summary>
/// Called whenever draggable regions for the browser window change.
/// These can be specified using the '-webkit-app-region: drag/no-drag' CSS-property.
/// If draggable regions are never defined in a document this method will also never be called.
/// If the last draggable region is removed from a document this method will be called with an empty IList.
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">the browser object</param>
/// <param name="frame">The frame</param>
/// <param name="regions">List of <see cref="DraggableRegion"/> objects or null if last region was removed.</param>
protected virtual void OnDraggableRegionsChanged(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IList<DraggableRegion> regions)
{
}
}
}