/// <summary>
/// Sets the drag image.
/// </summary>
/// <param name="dataObject">The DataObject to set the drag image on.</param>
/// <param name="image">The drag image.</param>
/// <param name="cursorOffset">The location of the cursor relative to the image.</param>
public static void SetDragImage(this System.Windows.Forms.IDataObject dataObject, Image image, Point cursorOffset)
{
var shdi = new ShDragImage();
Win32Size size;
size.cx = image.Width;
size.cy = image.Height;
shdi.sizeDragImage = size;
Win32Point wpt;
wpt.x = cursorOffset.X;
wpt.y = cursorOffset.Y;
shdi.ptOffset = wpt;
shdi.crColorKey = Color.Magenta.ToArgb();
// This HBITMAP will be managed by the DragDropHelper
// as soon as we pass it to InitializeFromBitmap. If we fail
// to make the hand off, we'll delete it to prevent a mem leak.
IntPtr hbmp = GetHbitmapFromImage(image);
shdi.hbmpDragImage = hbmp;
try {
var sourceHelper = (IDragSourceHelper) new DragDropHelper();
try {
sourceHelper.InitializeFromBitmap(ref shdi, (ComIDataObject)dataObject);
}
catch (NotImplementedException ex) {
throw new Exception(
"A NotImplementedException was caught. This could be because you forgot to construct your DataObject using a DragDropLib.DataObject",
ex);
}
}
catch {
DeleteObject(hbmp);
}
}
/// <summary>
/// Sets the drag image.
/// </summary>
/// <param name="dataObject">The DataObject to set the drag image on.</param>
/// <param name="image">The drag image.</param>
/// <param name="cursorOffset">The location of the cursor relative to the image.</param>
public static void SetDragImage(this System.Windows.Forms.IDataObject dataObject, Image image, Point cursorOffset) {
var shdi = new ShDragImage();
Win32Size size;
size.cx = image.Width;
size.cy = image.Height;
shdi.sizeDragImage = size;
Win32Point wpt;
wpt.x = cursorOffset.X;
wpt.y = cursorOffset.Y;
shdi.ptOffset = wpt;
shdi.crColorKey = Color.Magenta.ToArgb();
// This HBITMAP will be managed by the DragDropHelper
// as soon as we pass it to InitializeFromBitmap. If we fail
// to make the hand off, we'll delete it to prevent a mem leak.
IntPtr hbmp = GetHbitmapFromImage(image);
shdi.hbmpDragImage = hbmp;
try {
var sourceHelper = (IDragSourceHelper) new DragDropHelper();
try {
sourceHelper.InitializeFromBitmap(ref shdi, (ComIDataObject) dataObject);
}
catch (NotImplementedException ex) {
throw new Exception(
"A NotImplementedException was caught. This could be because you forgot to construct your DataObject using a DragDropLib.DataObject",
ex);
}
}
catch {
DeleteObject(hbmp);
}
}
