private DragEventArgs CreateDragEventArgs(object pDataObj, int grfKeyState, NativeMethods.POINTL pt, int pdwEffect)
{
IDataObject data = null;
if (pDataObj == null)
{
data = lastDataObject;
}
else
{
if (pDataObj is IDataObject)
{
data = (IDataObject)pDataObj;
}
else if (pDataObj is IComDataObject)
{
data = new DataObject(pDataObj);
}
else
{
return(null); // Unknown data object interface; we can't work with this so return null
}
}
DragEventArgs drgevent = new DragEventArgs(data, grfKeyState, pt.x, pt.y, (DragDropEffects)pdwEffect, lastEffect);
lastDataObject = data;
return(drgevent);
}
int UnsafeNativeMethods.IOleDropTarget.OleDragEnter(object pDataObj, int grfKeyState,
UnsafeNativeMethods.POINTSTRUCT pt,
ref int pdwEffect)
{
Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "OleDragEnter recieved");
NativeMethods.POINTL ptl = new NativeMethods.POINTL
{
x = pt.x,
y = pt.y
};
Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "\t" + (ptl.x) + "," + (ptl.y));
Debug.Assert(pDataObj != null, "OleDragEnter didn't give us a valid data object.");
DragEventArgs drgevent = CreateDragEventArgs(pDataObj, grfKeyState, ptl, pdwEffect);
if (drgevent != null)
{
owner.OnDragEnter(drgevent);
pdwEffect = (int)drgevent.Effect;
lastEffect = drgevent.Effect;
}
else
{
pdwEffect = (int)DragDropEffects.None;
}
return(NativeMethods.S_OK);
}
int UnsafeNativeMethods.IOleDropTarget.OleDragOver(int grfKeyState, long pt, ref int pdwEffect)
{
NativeMethods.POINTL pointl = new NativeMethods.POINTL {
x = this.GetX(pt),
y = this.GetY(pt)
};
DragEventArgs e = this.CreateDragEventArgs(null, grfKeyState, pointl, pdwEffect);
this.owner.OnDragOver(e);
pdwEffect = (int)e.Effect;
this.lastEffect = e.Effect;
return(0);
}
int UnsafeNativeMethods.IOleDropTarget.OleDragOver(int grfKeyState, UnsafeNativeMethods.POINTSTRUCT pt, ref int pdwEffect)
{
Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "OleDragOver recieved");
NativeMethods.POINTL ptl = new NativeMethods.POINTL();
ptl.x = pt.x;
ptl.y = pt.y;
Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "\t" + (ptl.x) + "," + (ptl.y));
DragEventArgs drgevent = CreateDragEventArgs(null, grfKeyState, ptl, pdwEffect);
owner.OnDragOver(drgevent);
pdwEffect = (int)drgevent.Effect;
lastEffect = drgevent.Effect;
return(NativeMethods.S_OK);
}
int UnsafeNativeMethods.IOleDropTarget.OleDragEnter(object pDataObj, int grfKeyState, long pt, ref int pdwEffect)
{
NativeMethods.POINTL pointl = new NativeMethods.POINTL {
x = this.GetX(pt),
y = this.GetY(pt)
};
DragEventArgs e = this.CreateDragEventArgs(pDataObj, grfKeyState, pointl, pdwEffect);
if (e != null)
{
this.owner.OnDragEnter(e);
pdwEffect = (int)e.Effect;
this.lastEffect = e.Effect;
}
else
{
pdwEffect = 0;
}
return(0);
}
int UnsafeNativeMethods.IOleDropTarget.OleDrop(object pDataObj, int grfKeyState, UnsafeNativeMethods.POINTSTRUCT pt, ref int pdwEffect)
{
Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "OleDrop recieved");
NativeMethods.POINTL ptl = new NativeMethods.POINTL();
ptl.x = pt.x;
ptl.y = pt.y;
Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "\t" + (ptl.x) + "," + (ptl.y));
DragEventArgs drgevent = CreateDragEventArgs(pDataObj, grfKeyState, ptl, pdwEffect);
if (drgevent != null)
{
owner.OnDragDrop(drgevent);
pdwEffect = (int)drgevent.Effect;
}
else
{
pdwEffect = (int)DragDropEffects.None;
}
lastEffect = DragDropEffects.None;
lastDataObject = null;
return(NativeMethods.S_OK);
}
private DragEventArgs CreateDragEventArgs(object pDataObj, int grfKeyState, NativeMethods.POINTL pt, int pdwEffect)
{
System.Windows.Forms.IDataObject data = null;
if (pDataObj == null)
{
data = this.lastDataObject;
}
else if (pDataObj is System.Windows.Forms.IDataObject)
{
data = (System.Windows.Forms.IDataObject)pDataObj;
}
else if (pDataObj is System.Runtime.InteropServices.ComTypes.IDataObject)
{
data = new DataObject(pDataObj);
}
else
{
return(null);
}
DragEventArgs args = new DragEventArgs(data, grfKeyState, pt.x, pt.y, (DragDropEffects)pdwEffect, this.lastEffect);
this.lastDataObject = data;
return(args);
}