Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DropTarget.cs / 1 / DropTarget.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Diagnostics; using System.Security.Permissions; using System.Security; using System.ComponentModel; using IComDataObject = System.Runtime.InteropServices.ComTypes.IDataObject; ////// internal class DropTarget : UnsafeNativeMethods.IOleDropTarget { private IDataObject lastDataObject = null; private DragDropEffects lastEffect = DragDropEffects.None; private IDropTarget owner; public DropTarget(IDropTarget owner) { Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "DropTarget created"); this.owner = owner; } #if DEBUG ~DropTarget() { Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "DropTarget destroyed"); } #endif 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, long pt, ref int pdwEffect) { Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "OleDragEnter recieved"); NativeMethods.POINTL ptl = new NativeMethods.POINTL(); ptl.x = GetX(pt); ptl.y = GetY(pt); 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) { Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "OleDragOver recieved"); NativeMethods.POINTL ptl = new NativeMethods.POINTL(); ptl.x = GetX(pt); ptl.y = GetY(pt); 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.OleDragLeave() { Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "OleDragLeave recieved"); owner.OnDragLeave(EventArgs.Empty); return NativeMethods.S_OK; } int UnsafeNativeMethods.IOleDropTarget.OleDrop(object pDataObj, int grfKeyState, long pt, ref int pdwEffect) { Debug.WriteLineIf(CompModSwitches.DragDrop.TraceInfo, "OleDrop recieved"); NativeMethods.POINTL ptl = new NativeMethods.POINTL(); ptl.x = GetX(pt); ptl.y = GetY(pt); 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 int GetX(long pt) { return(int)(pt & 0xFFFFFFFF); } private int GetY(long pt) { return(int)((pt >> 32) & 0xFFFFFFFF); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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