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WPF - StartDragging populate DataObject with Image #2687

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WPF - StartDragging populate DataObject with Image #2687

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05906a4
On dragging start, expose potential image from CEF's drag data throug…
remye06 Mar 13, 2019
ee0749a
Merge branch 'master' into master
remye06 Mar 13, 2019
d9f522b
Merge branch 'master' into master
amaitland Apr 5, 2019
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35 changes: 25 additions & 10 deletions CefSharp.Wpf/ChromiumWebBrowser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using CefSharp.Enums;
using CefSharp.Internals;
Expand Down Expand Up @@ -745,16 +747,29 @@ bool IRenderWebBrowser.StartDragging(IDragData dragData, DragOperationsMask allo
currentDragData = dragData.Clone();
currentDragData.ResetFileContents();

// TODO: The following code block *should* handle images, but GetFileContents is
// not yet implemented.
//if (dragData.IsFile)
//{
// var bmi = new BitmapImage();
// bmi.BeginInit();
// bmi.StreamSource = dragData.GetFileContents();
// bmi.EndInit();
// dataObject.SetImage(bmi);
//}
if (dragData.HasImage)
{
IImage dragImage = dragData.Image;
int width, height;
byte[] pixels = dragImage.GetAsBitmap(1f, ColorType.Rgba8888, AlphaType.PreMultiplied, out width, out height);
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Should the scale factor be dynamic based on the display? I would have though so.

int stride = ((width * 32 + 31) & ~31) / 8;
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Looks like your using PixelFormats.Pbgra32 below, so it should be the correct format. Use

(PixelFormats.Pbgra32.BitsPerPixel / 8) * width to calculate stride

https://github.com/cefsharp/CefSharp/blob/cefsharp/71/CefSharp.Wpf/Rendering/InteropBitmapRenderHandler.cs#L31

var bitmap = BitmapSource.Create(width, height, 96.0, 96.0, PixelFormats.Pbgra32, null, pixels, stride);
bitmap.Freeze();
dataObject.SetImage(bitmap);
}
else
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This should be removed if you've added support for image.

{
// TODO: The following code block *should* handle images, but GetFileContents is
// not yet implemented.
//if (dragData.IsFile)
//{
// var bmi = new BitmapImage();
// bmi.BeginInit();
// bmi.StreamSource = dragData.GetFileContents();
// bmi.EndInit();
// dataObject.SetImage(bmi);
//}
}

UiThreadRunAsync(delegate
{
Expand Down