Regression: Search+Key pops up app launcher

ui/base/accelerators/accelerator_history.h

+// Copyright 2014 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_BASE_ACCELERATORS_ACCELERATOR_HISTORY_H_
+#define UI_BASE_ACCELERATORS_ACCELERATOR_HISTORY_H_
+
+#include "base/memory/singleton.h"
+#include "ui/base/accelerators/accelerator.h"
+#include "ui/base/ui_base_export.h"
+#include "ui/events/event.h"
+
+namespace ui {
+
+// ----------------------------------------------------------------------
+// Wraps an accelerator with the time stamp at which it was recorded.
+// ----------------------------------------------------------------------
+struct UI_BASE_EXPORT AcceleratorEvent {
+  Accelerator accelerator;
+  base::TimeTicks time_stamp;
+
+  AcceleratorEvent()
+    : accelerator(),
+      time_stamp(base::TimeTicks::Now()) {
+  }
+
+  explicit AcceleratorEvent(const Accelerator& anAccelerator)
+    : accelerator(anAccelerator),
+      time_stamp(base::TimeTicks::Now()) {
+  }
+};
+
+// ----------------------------------------------------------------------
+// Keeps track of the system-wide current and the most recent previous
+// key accelerators.
+// ----------------------------------------------------------------------
+class UI_BASE_EXPORT AcceleratorHistory {
+ public:
+  static AcceleratorHistory* GetInstance();
+
+  // Builds and records the current accelerator using the given |event|.
+  void BuildCurrentAccelerator(const ui::KeyEvent& event);
+
+  // Returns the most recent recorded accelerator.
+  const AcceleratorEvent& GetCurrentAccelerator() const;
+
+  // Returns the most recent previously recorded accelerator that is different
+  // than the current.
+  const AcceleratorEvent& GetPreviousAccelerator() const;
+
+ private:
+  friend struct DefaultSingletonTraits<AcceleratorHistory>;
+
+  AcceleratorHistory();
+  ~AcceleratorHistory();
+
+  // We are only interested in the most recent 'different' accelerator. If the
+  // new |event| will result in the same current accelerator then we should
+  // ignore it.
+  bool ShouldBuildCurrentAccelerator(const ui::KeyEvent& event,
+                                     const int event_modifiers) const;
+
+  AcceleratorEvent current_accelerator_;
+  AcceleratorEvent previous_accelerator_;
+
+  DISALLOW_COPY_AND_ASSIGN(AcceleratorHistory);
+};
+
+}; // namespace ui
+
+#endif  // UI_BASE_ACCELERATORS_ACCELERATOR_HISTORY_H_