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DragHandler.cs
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/
DragHandler.cs
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// Copyright © 2016 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;
using System.Collections.Generic;
using System.Drawing;
using CefSharp.Enums;
namespace CefSharp.Wpf.Example.Handlers
{
public class DragHandler : IDragHandler, IDisposable
{
public event Action<Region> RegionsChanged;
bool IDragHandler.OnDragEnter(IWebBrowser chromiumWebBrowser, IBrowser browser, IDragData dragData, DragOperationsMask mask)
{
return false;
}
void IDragHandler.OnDraggableRegionsChanged(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IList<DraggableRegion> regions)
{
//By default popup browers are native windows in WPF so we cannot handle their drag using this method
if (browser.IsPopup == false)
{
//NOTE: I haven't tested with dynamically adding removing regions so this may need some tweaking
Region draggableRegion = null;
if (regions.Count > 0)
{
//Take the individual Region and construct a complex Region that represents them all.
foreach (var region in regions)
{
var rect = new Rectangle(region.X, region.Y, region.Width, region.Height);
if (draggableRegion == null)
{
draggableRegion = new Region(rect);
}
else
{
if (region.Draggable)
{
draggableRegion.Union(rect);
}
else
{
//In the scenario where we have an outer region, that is draggable and it has
// an inner region that's not, we must exclude the non draggable.
// Not all scenarios are covered in this example.
draggableRegion.Exclude(rect);
}
}
}
}
var handler = RegionsChanged;
if (handler != null)
{
handler(draggableRegion);
}
}
}
public void Dispose()
{
RegionsChanged = null;
}
}
}