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-rw-r--r--app/win/drop_target.h136
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diff --git a/app/win/drop_target.h b/app/win/drop_target.h
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-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef APP_WIN_DROP_TARGET_H_
-#define APP_WIN_DROP_TARGET_H_
-#pragma once
-
-#include <objidl.h>
-
-#include "base/ref_counted.h"
-
-// Windows interface.
-struct IDropTargetHelper;
-
-namespace app {
-namespace win {
-
-// A DropTarget implementation that takes care of the nitty gritty
-// of dnd. While this class is concrete, subclasses will most likely
-// want to override various OnXXX methods.
-//
-// Because DropTarget is ref counted you shouldn't delete it directly,
-// rather wrap it in a scoped_refptr. Be sure and invoke RevokeDragDrop(m_hWnd)
-// before the HWND is deleted too.
-//
-// This class is meant to be used in a STA and is not multithread-safe.
-class DropTarget : public IDropTarget {
- public:
- // Create a new DropTarget associating it with the given HWND.
- explicit DropTarget(HWND hwnd);
- virtual ~DropTarget();
-
- // When suspended is set to |true|, the drop target does not receive drops
- // from drags initiated within the owning HWND.
- bool suspended() const { return suspended_; }
- void set_suspended(bool suspended) { suspended_ = suspended; }
-
- // IDropTarget implementation:
- HRESULT __stdcall DragEnter(IDataObject* data_object,
- DWORD key_state,
- POINTL cursor_position,
- DWORD* effect);
- HRESULT __stdcall DragOver(DWORD key_state,
- POINTL cursor_position,
- DWORD* effect);
- HRESULT __stdcall DragLeave();
- HRESULT __stdcall Drop(IDataObject* data_object,
- DWORD key_state,
- POINTL cursor_position,
- DWORD* effect);
-
- // IUnknown implementation:
- HRESULT __stdcall QueryInterface(const IID& iid, void** object);
- ULONG __stdcall AddRef();
- ULONG __stdcall Release();
-
- protected:
- // Returns the hosting HWND.
- HWND GetHWND() { return hwnd_; }
-
- // Invoked when the cursor first moves over the hwnd during a dnd session.
- // This should return a bitmask of the supported drop operations:
- // DROPEFFECT_NONE, DROPEFFECT_COPY, DROPEFFECT_LINK and/or
- // DROPEFFECT_MOVE.
- virtual DWORD OnDragEnter(IDataObject* data_object,
- DWORD key_state,
- POINT cursor_position,
- DWORD effect);
-
- // Invoked when the cursor moves over the window during a dnd session.
- // This should return a bitmask of the supported drop operations:
- // DROPEFFECT_NONE, DROPEFFECT_COPY, DROPEFFECT_LINK and/or
- // DROPEFFECT_MOVE.
- virtual DWORD OnDragOver(IDataObject* data_object,
- DWORD key_state,
- POINT cursor_position,
- DWORD effect);
-
- // Invoked when the cursor moves outside the bounds of the hwnd during a
- // dnd session.
- virtual void OnDragLeave(IDataObject* data_object);
-
- // Invoked when the drop ends on the window. This should return the operation
- // that was taken.
- virtual DWORD OnDrop(IDataObject* data_object,
- DWORD key_state,
- POINT cursor_position,
- DWORD effect);
-
- // Return the drag identity.
- static int32 GetDragIdentity() { return drag_identity_; }
-
- private:
- // Returns the cached drop helper, creating one if necessary. The returned
- // object is not addrefed. May return NULL if the object couldn't be created.
- static IDropTargetHelper* DropHelper();
-
- // The data object currently being dragged over this drop target.
- scoped_refptr<IDataObject> current_data_object_;
-
- // A helper object that is used to provide drag image support while the mouse
- // is dragging over the content area.
- //
- // DO NOT ACCESS DIRECTLY! Use DropHelper() instead, which will lazily create
- // this if it doesn't exist yet. This object can take tens of milliseconds to
- // create, and we don't want to block any window opening for this, especially
- // since often, DnD will never be used. Instead, we force this penalty to the
- // first time it is actually used.
- static IDropTargetHelper* cached_drop_target_helper_;
-
- // The drag identity (id). An up-counter that increases when the cursor first
- // moves over the HWND in a DnD session (OnDragEnter). 0 is reserved to mean
- // the "no/unknown" identity, and is used for initialization. The identity is
- // sent to the renderer in drag enter notifications. Note: the identity value
- // is passed over the renderer NPAPI interface to gears, so use int32 instead
- // of int here.
- static int32 drag_identity_;
-
- // The HWND of the source. This HWND is used to determine coordinates for
- // mouse events that are sent to the renderer notifying various drag states.
- HWND hwnd_;
-
- // Whether or not we are currently processing drag notifications for drags
- // initiated in this window.
- bool suspended_;
-
- LONG ref_count_;
-
- DISALLOW_COPY_AND_ASSIGN(DropTarget);
-};
-
-} // namespace win
-} // namespace app
-
-#endif // APP_WIN_DROP_TARGET_H_