1 files changed, 103 insertions, 0 deletions
diff --git a/widget/windows/nsNativeDragTarget.h b/widget/windows/nsNativeDragTarget.h
new file mode 100644
index 0000000000..82edc7aae7
--- /dev/null
+++ b/widget/windows/nsNativeDragTarget.h
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef _nsNativeDragTarget_h_
+#define _nsNativeDragTarget_h_
+
+#include "nsCOMPtr.h"
+#include <ole2.h>
+#include <shlobj.h>
+
+#ifndef IDropTargetHelper
+#  include <shobjidl.h>  // Vista drag image interfaces
+#  undef LogSeverity     // SetupAPI.h #defines this as DWORD
+#endif
+
+#include "mozilla/Attributes.h"
+#include "mozilla/EventForwards.h"
+
+class nsIDragService;
+class nsIWidget;
+
+/*
+ * nsNativeDragTarget implements the IDropTarget interface and gets most of its
+ * behavior from the associated adapter (m_dragDrop).
+ */
+
+class nsNativeDragTarget final : public IDropTarget {
+ public:
+  explicit nsNativeDragTarget(nsIWidget* aWidget);
+  ~nsNativeDragTarget();
+
+  // IUnknown members - see iunknown.h for documentation
+  STDMETHODIMP QueryInterface(REFIID, void**);
+  STDMETHODIMP_(ULONG) AddRef();
+  STDMETHODIMP_(ULONG) Release();
+
+  // IDataTarget members
+
+  // Set pEffect based on whether this object can support a drop based on
+  // the data available from pSource, the key and mouse states specified
+  // in grfKeyState, and the coordinates specified by point. This is
+  // called by OLE when a drag enters this object's window (as registered
+  // by Initialize).
+  STDMETHODIMP DragEnter(LPDATAOBJECT pSource, DWORD grfKeyState, POINTL point,
+                         DWORD* pEffect);
+
+  // Similar to DragEnter except it is called frequently while the drag
+  // is over this object's window.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY STDMETHODIMP DragOver(DWORD grfKeyState,
+                                                    POINTL point,
+                                                    DWORD* pEffect);
+
+  // Release the drag-drop source and put internal state back to the point
+  // before the call to DragEnter. This is called when the drag leaves
+  // without a drop occurring.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY STDMETHODIMP DragLeave();
+
+  // If point is within our region of interest and pSource's data supports
+  // one of our formats, get the data and set pEffect according to
+  // grfKeyState (DROPEFFECT_MOVE if the control key was not pressed,
+  // DROPEFFECT_COPY if the control key was pressed). Otherwise return
+  // E_FAIL.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY STDMETHODIMP Drop(LPDATAOBJECT pSource,
+                                                DWORD grfKeyState, POINTL point,
+                                                DWORD* pEffect);
+  /**
+   * Cancel the current drag session, if any.
+   */
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void DragCancel();
+
+  static void DragImageChanged() { gDragImageChanged = true; }
+
+ protected:
+  void GetGeckoDragAction(DWORD grfKeyState, LPDWORD pdwEffect,
+                          uint32_t* aGeckoAction);
+  void ProcessDrag(mozilla::EventMessage aEventMessage, DWORD grfKeyState,
+                   POINTL pt, DWORD* pdwEffect);
+  void DispatchDragDropEvent(mozilla::EventMessage aEventMessage,
+                             const POINTL& aPT);
+  void AddLinkSupportIfCanBeGenerated(LPDATAOBJECT aIDataSource);
+
+  // Native Stuff
+  ULONG m_cRef;  // reference count
+  HWND mHWnd;
+  DWORD mEffectsAllowed;
+  DWORD mEffectsPreferred;
+  bool mTookOwnRef;
+
+  // Gecko Stuff
+  nsIWidget* mWidget;
+  nsCOMPtr<nsIDragService> mDragService;
+  // Drag target helper
+  IDropTargetHelper* GetDropTargetHelper();
+
+ private:
+  // Drag target helper
+  IDropTargetHelper* mDropTargetHelper;
+
+  static bool gDragImageChanged;
+};
+
+#endif  // _nsNativeDragTarget_h_