Refactors RootViewDropTarget into a platform independent part,

DropHelper, and the platform specific part DropTarget. I've also moved
ownership/creation of the DropTarget to Widget. This makes it alot
easier for the windows side, in which DropTarget must implement
IDataObject.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/165155

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@23020 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 53 insertions, 0 deletions

diff --git a/views/widget/drop_target_win.h b/views/widget/drop_target_win.h
new file mode 100644
index 0000000..d771c07
--- /dev/null
+++ b/views/widget/drop_target_win.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2009 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 VIEWS_WIDGET_DROP_TARGET_WIN_H_
+#define VIEWS_WIDGET_DROP_TARGET_WIN_H_
+
+#include "base/base_drop_target.h"
+#include "views/widget/drop_helper.h"
+
+namespace views {
+
+class RootView;
+class View;
+
+// DropTargetWin takes care of managing drag and drop for WidgetWin. It
+// converts Windows OLE drop messages into Views drop messages.
+//
+// DropTargetWin uses DropHelper to manage the appropriate view to target
+// drop messages at.
+class DropTargetWin : public BaseDropTarget {
+ public:
+  explicit DropTargetWin(RootView* root_view);
+  virtual ~DropTargetWin();
+
+  // If a drag and drop is underway and view is the current drop target, the
+  // drop target is set to null.
+  // This is invoked when a View is removed from the RootView to make sure
+  // we don't target a view that was removed during dnd.
+  void ResetTargetViewIfEquals(View* view);
+
+ protected:
+  virtual DWORD OnDragOver(IDataObject* data_object,
+                           DWORD key_state,
+                           POINT cursor_position,
+                           DWORD effect);
+
+  virtual void OnDragLeave(IDataObject* data_object);
+
+  virtual DWORD OnDrop(IDataObject* data_object,
+                       DWORD key_state,
+                       POINT cursor_position,
+                       DWORD effect);
+
+ private:
+  views::DropHelper helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(DropTargetWin);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_WIDGET_DROP_TARGET_WIN_H_