wip: Second crack at implementing the touch exploration mode.

ash/touch/touch_exploration_controller.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 ASH_TOUCH_TOUCH_EXPLORATION_CONTROLLER_H_
+#define ASH_TOUCH_TOUCH_EXPLORATION_CONTROLLER_H_
+
+#include "ash/ash_export.h"
+#include "ash/display/display_controller.h"
+#include "base/values.h"
+#include "ui/aura/window.h"
+#include "ui/events/event.h"
+#include "ui/events/event_rewriter.h"
+
+namespace ash {
+
+// TODO: How much screen/display logic (DisplayController::Observer,
+// gfx::DisplayObserver, etc) do we need here? This is managed from
+// RootWindowCOntroller
+// TODO: Maybe implement gfx::DisplayObserver
+// TODO: Do we need to inherit from OutputConfigurator::Observer to react to
+// OnDisplayModeChanged()?
+class ASH_EXPORT TouchExplorationController :
+    public ui::EventRewriter,
+    public DisplayController::Observer {
+ public:
+
+  explicit TouchExplorationController(aura::Window* root_window);
+  virtual ~TouchExplorationController();
+
+ private:
+  //Overridden from ui::EventRewriter
+  virtual ui::EventRewriteStatus RewriteEvent(
+      const ui::Event& event, scoped_ptr<ui::Event>* rewritten_event) OVERRIDE;
+  virtual ui::EventRewriteStatus NextDispatchEvent(
+      const ui::Event& last_event, scoped_ptr<ui::Event>* new_event) OVERRIDE;
+
+  // Overridden form DisplayController::Observer.
+  virtual void OnDisplaysInitialized() OVERRIDE;
+  virtual void OnDisplayConfigurationChanging() OVERRIDE;
+  virtual void OnDisplayConfigurationChanged() OVERRIDE;
+
+  ui::Event* CreateMouseMoveEvent(gfx::Point location, int flags);
+
+  std::vector<int> touch_ids_;
+  // map of touch ids to their last know locations
+  std::map<int, gfx::Point> touch_locations_;
+
+  // Initialized from RewriteEvent() and dispatched in NextDispatchEvent().
+  scoped_ptr<ui::Event> next_dispatch_event_;
+
+  const int64 display_id_;
+  aura::Window* root_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchExplorationController);
+};
+
+}  // namespace ash
+
+#endif  // ASH_TOUCH_TOUCH_EXPLORATION_CONTROLLER_H_