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Diffstat (limited to 'app/win/drop_target.h')
-rw-r--r-- | app/win/drop_target.h | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/app/win/drop_target.h b/app/win/drop_target.h deleted file mode 100644 index e7dc1ec..0000000 --- a/app/win/drop_target.h +++ /dev/null @@ -1,136 +0,0 @@ -// 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_ |