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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_DRAGDROP_DRAG_SOURCE_WIN_H_
#define UI_BASE_DRAGDROP_DRAG_SOURCE_WIN_H_
#include <objidl.h>
#include <wrl/implements.h>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
namespace ui {
class OSExchangeData;
// A base IDropSource implementation. Handles notifications sent by an active
// drag-drop operation as the user mouses over other drop targets on their
// system. This object tells Windows whether or not the drag should continue,
// and supplies the appropriate cursors.
class DragSourceWin
: public Microsoft::WRL::RuntimeClass<
Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::ClassicCom>,
IDropSource> {
public:
// Factory method to avoid exporting the class and all it derives from.
static COMPONENT_EXPORT(
UI_BASE) Microsoft::WRL::ComPtr<DragSourceWin> Create();
// Use Create() to construct these objects. Direct calls to the constructor
// are an error - it is only public because a WRL helper function creates the
// objects.
DragSourceWin();
DragSourceWin(const DragSourceWin&) = delete;
DragSourceWin& operator=(const DragSourceWin&) = delete;
~DragSourceWin() override = default;
// Stop the drag operation at the next chance we get. This doesn't
// synchronously stop the drag (since Windows is controlling that),
// but lets us tell Windows to cancel the drag the next chance we get.
void CancelDrag() {
cancel_drag_ = true;
}
// IDropSource implementation:
HRESULT __stdcall QueryContinueDrag(BOOL escape_pressed,
DWORD key_state) override;
HRESULT __stdcall GiveFeedback(DWORD effect) override;
// Used to set the active data object for the current drag operation. The
// caller must ensure that |data| is not destroyed before the nested drag loop
// terminates.
void set_data(const OSExchangeData* data) { data_ = data; }
protected:
virtual void OnDragSourceDrop();
private:
// Set to true if we want to cancel the drag operation.
bool cancel_drag_ = false;
raw_ptr<const OSExchangeData> data_ = nullptr;
};
} // namespace ui
#endif // UI_BASE_DRAGDROP_DRAG_SOURCE_WIN_H_
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