internal static bool HandleEvent(IntPtr callref, IntPtr eventref, IntPtr handle, uint kind, ref MSG msg)
{
Control control;
DataObject data;
DragEventArgs drag_event;
DragDropEffects allowed;
QDPoint point = new QDPoint();
UInt32 actions = 0;
IntPtr dragref = IntPtr.Zero;
Hwnd hwnd = Hwnd.ObjectFromHandle(handle);
if (hwnd == null || hwnd.Handle != handle)
{
return(false);
}
GetEventParameter(eventref, kEventParamDragRef, typeDragRef, IntPtr.Zero, (uint)Marshal.SizeOf(typeof(IntPtr)), IntPtr.Zero, ref dragref);
XplatUICarbon.GetGlobalMouse(ref point);
GetDragAllowableActions(dragref, ref actions);
control = Control.FromHandle(hwnd.Handle);
allowed = DragActionsToEffects(actions);
data = DragToDataObject(dragref);
drag_event = new DragEventArgs(data, 0, point.x, point.y, allowed, DragDropEffects.None);
switch (kind)
{
case ControlHandler.kEventControlDragEnter:
{
bool accept = control.AllowDrop;
SetEventParameter(eventref, ControlHandler.kEventParamControlLikesDrag, ControlHandler.typeBoolean, (uint)Marshal.SizeOf(typeof(bool)), ref accept);
control.DndEnter(drag_event);
effects = drag_event.Effect;
return(false);
}
case ControlHandler.kEventControlDragWithin:
control.DndOver(drag_event);
effects = drag_event.Effect;
break;
case ControlHandler.kEventControlDragLeave:
control.DndLeave(drag_event);
break;
case ControlHandler.kEventControlDragReceive:
control.DndDrop(drag_event);
break;
}
return(true);
}
public DragDropEffects StartDrag(IntPtr handle, object data, DragDropEffects allowed_effects)
{
IntPtr dragref = IntPtr.Zero;
EventRecord eventrecord = new EventRecord();
effects = DragDropEffects.None;
NewDrag(ref dragref);
XplatUICarbon.GetGlobalMouse(ref eventrecord.mouse);
StoreObjectInDrag(handle, dragref, data);
TrackDrag(dragref, ref eventrecord, IntPtr.Zero);
DisposeDrag(dragref);
return(effects);
}