tc@google.com
f5a077e1fd
we're in the middle of a drag originating from the tab. The problem is that the tab gets deleted out from under the drag operation which is happening in a nested message loop. To work around this, if we're in the middle of a drag and we get a tab close request, delay the tab close until after the drag operation is finished. BUG=16280 Review URL: http://codereview.chromium.org/149466 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20436 0039d316-1c4b-4281-b951-d872f2087c98
57 linhas
1.6 KiB
C++
57 linhas
1.6 KiB
C++
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_BASE_DRAG_SOURCE_H_
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#define BASE_BASE_DRAG_SOURCE_H_
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#include <objidl.h>
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#include "base/basictypes.h"
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///////////////////////////////////////////////////////////////////////////////
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//
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// BaseDragSource
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//
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// A base IDropSource implementation. Handles notifications sent by an active
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// drag-drop operation as the user mouses over other drop targets on their
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// system. This object tells Windows whether or not the drag should continue,
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// and supplies the appropriate cursors.
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//
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class BaseDragSource : public IDropSource {
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public:
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BaseDragSource();
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virtual ~BaseDragSource() { }
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// Stop the drag operation at the next chance we get. This doesn't
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// synchronously stop the drag (since Windows is controlling that),
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// but lets us tell Windows to cancel the drag the next chance we get.
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void CancelDrag() {
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cancel_drag_ = true;
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}
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// IDropSource implementation:
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HRESULT __stdcall QueryContinueDrag(BOOL escape_pressed, DWORD key_state);
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HRESULT __stdcall GiveFeedback(DWORD effect);
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// IUnknown implementation:
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HRESULT __stdcall QueryInterface(const IID& iid, void** object);
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ULONG __stdcall AddRef();
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ULONG __stdcall Release();
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protected:
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virtual void OnDragSourceCancel() { }
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virtual void OnDragSourceDrop() { }
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virtual void OnDragSourceMove() { }
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private:
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LONG ref_count_;
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// Set to true if we want to cancel the drag operation.
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bool cancel_drag_;
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DISALLOW_EVIL_CONSTRUCTORS(BaseDragSource);
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};
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#endif // BASE_BASE_DRAG_SOURCE_H_
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