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-rw-r--r--ui/wm/public/scoped_drag_drop_disabler.cc55
-rw-r--r--ui/wm/public/scoped_drag_drop_disabler.h40
2 files changed, 95 insertions, 0 deletions
diff --git a/ui/wm/public/scoped_drag_drop_disabler.cc b/ui/wm/public/scoped_drag_drop_disabler.cc
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--- /dev/null
+++ b/ui/wm/public/scoped_drag_drop_disabler.cc
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+// Copyright 2015 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/wm/public/scoped_drag_drop_disabler.h"
+
+#include "ui/aura/window.h"
+#include "ui/wm/public/drag_drop_client.h"
+
+namespace aura {
+namespace client {
+
+class NopDragDropClient : public DragDropClient {
+ public:
+ ~NopDragDropClient() override {}
+ int StartDragAndDrop(const ui::OSExchangeData& data,
+ aura::Window* root_window,
+ aura::Window* source_window,
+ const gfx::Point& screen_location,
+ int operation,
+ ui::DragDropTypes::DragEventSource source) override {
+ return 0;
+ }
+ void DragUpdate(aura::Window* target,
+ const ui::LocatedEvent& event) override {}
+ void Drop(aura::Window* target, const ui::LocatedEvent& event) override {}
+ void DragCancel() override {}
+ bool IsDragDropInProgress() override {
+ return false;
+ }
+};
+
+ScopedDragDropDisabler::ScopedDragDropDisabler(Window* window)
+ : window_(window),
+ old_client_(GetDragDropClient(window)),
+ new_client_(new NopDragDropClient()) {
+ SetDragDropClient(window_, new_client_.get());
+ window_->AddObserver(this);
+}
+
+ScopedDragDropDisabler::~ScopedDragDropDisabler() {
+ if (window_) {
+ window_->RemoveObserver(this);
+ SetDragDropClient(window_, old_client_);
+ }
+}
+
+void ScopedDragDropDisabler::OnWindowDestroyed(Window* window) {
+ CHECK_EQ(window_, window);
+ window_ = NULL;
+ new_client_.reset();
+}
+
+} // namespace client
+} // namespace aura
diff --git a/ui/wm/public/scoped_drag_drop_disabler.h b/ui/wm/public/scoped_drag_drop_disabler.h
new file mode 100644
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--- /dev/null
+++ b/ui/wm/public/scoped_drag_drop_disabler.h
@@ -0,0 +1,40 @@
+// Copyright 2015 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 UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_
+#define UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/window_observer.h"
+
+namespace aura {
+class Window;
+
+namespace client {
+class DragDropClient;
+
+// ScopedDragDropDisabler is used to temporarily replace the drag'n'drop client
+// for a window with a "no-op" client. Upon construction, it installs a new
+// client on the window, and upon destruction, it restores the previous one.
+class AURA_EXPORT ScopedDragDropDisabler : public WindowObserver {
+ public:
+ explicit ScopedDragDropDisabler(Window* window);
+ ~ScopedDragDropDisabler() override;
+
+ private:
+ // WindowObserver:
+ void OnWindowDestroyed(Window* window) override;
+
+ Window* window_;
+ DragDropClient* old_client_;
+ scoped_ptr<DragDropClient> new_client_;
+
+ DISALLOW_COPY_AND_ASSIGN(ScopedDragDropDisabler);
+};
+
+} // namespace client
+} // namespace aura
+
+#endif // UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_