Get drag and drop working for win aura.

ui/views/widget/desktop_aura/desktop_drag_drop_client_win.cc

+// Copyright (c) 2012 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.
+
+#include "ui/views/widget/desktop_aura/desktop_drag_drop_client_win.h"
+
+#include "ui/base/dragdrop/drag_drop_types.h"
+#include "ui/base/dragdrop/drag_source.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
+#include "ui/views/widget/desktop_aura/desktop_root_window_host_win.h"
+#include "ui/views/widget/drop_target_win.h"
+
+namespace views {
+
+DesktopDragDropClientWin::DesktopDragDropClientWin()
+    : drag_drop_in_progress_(false),
+      drag_operation_(0) {
+}
+
+DesktopDragDropClientWin::~DesktopDragDropClientWin() {
+}
+
+int DesktopDragDropClientWin::StartDragAndDrop(
+    const ui::OSExchangeData& data,
+    aura::RootWindow* root_window,
+    aura::Window* source_window,
+    const gfx::Point& root_location,
+    int operation,
+    ui::DragDropTypes::DragEventSource source) {
+  drag_drop_in_progress_ = true;
+  drag_operation_ = operation;
+
+  drag_source_ = new ui::DragSource;
+  DWORD effects;
+  DoDragDrop(ui::OSExchangeDataProviderWin::GetIDataObject(data),
+             drag_source_,
+             ui::DragDropTypes::DragOperationToDropEffect(operation),
+             &effects);
+
+  drag_drop_in_progress_ = false;
+
+  return drag_operation_;
+}
+
+void DesktopDragDropClientWin::DragUpdate(aura::Window* target,
+                                          const ui::LocatedEvent& event) {
+}
+
+void DesktopDragDropClientWin::Drop(aura::Window* target,
+                                    const ui::LocatedEvent& event) {
+}
+
+void DesktopDragDropClientWin::DragCancel() {
+  drag_source_->CancelDrag();
+  drag_operation_ = 0;
+}
+
+bool DesktopDragDropClientWin::IsDragDropInProgress() {
+  return drag_drop_in_progress_;
+}
+
+void DesktopDragDropClientWin::OnNativeWidgetCreated(
+    HWND window, internal::RootView* root_view) {
+  drop_target_ = new DropTargetWin(root_view, window);
+}
+
+void DesktopDragDropClientWin::OnNativeWidgetDestroying(HWND window) {
+  if (drop_target_.get()) {
+    RevokeDragDrop(window);
+    drop_target_ = NULL;
+  }
+}
+
+}  // namespace views