public static DragDropEffects CanDropClipboard(ShellItem item)
{
IntPtr dataObject;
ShellAPI.OleGetClipboard(out dataObject);
IntPtr targetPtr;
Raccoom.Win32.IDropTarget target;
DragDropEffects retVal = DragDropEffects.None;
if (GetIDropTarget(item, out targetPtr, out target))
{
#region Check Copy
DragDropEffects effects = DragDropEffects.Copy;
if (target.DragEnter(
dataObject,
ShellAPI.MK.CONTROL,
new ShellAPI.POINT(0, 0),
ref effects) == ShellAPI.S_OK)
{
if (effects == DragDropEffects.Copy)
{
retVal |= DragDropEffects.Copy;
}
target.DragLeave();
}
#endregion
#region Check Move
effects = DragDropEffects.Move;
if (target.DragEnter(
dataObject,
ShellAPI.MK.SHIFT,
new ShellAPI.POINT(0, 0),
ref effects) == ShellAPI.S_OK)
{
if (effects == DragDropEffects.Move)
{
retVal |= DragDropEffects.Move;
}
target.DragLeave();
}
#endregion
#region Check Lick
effects = DragDropEffects.Link;
if (target.DragEnter(
dataObject,
ShellAPI.MK.ALT,
new ShellAPI.POINT(0, 0),
ref effects) == ShellAPI.S_OK)
{
if (effects == DragDropEffects.Link)
{
retVal |= DragDropEffects.Link;
}
target.DragLeave();
}
#endregion
Marshal.ReleaseComObject(target);
Marshal.Release(targetPtr);
}
return(retVal);
}