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mojo/services/window_manager/view_target.h

Index: mojo/services/window_manager/view_target.h
diff --git a/mojo/services/window_manager/view_target.h b/mojo/services/window_manager/view_target.h
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+// 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 SERVICES_WINDOW_MANAGER_VIEW_TARGET_H_
+#define SERVICES_WINDOW_MANAGER_VIEW_TARGET_H_
+
+#include "ui/events/event_target.h"
+
+namespace gfx {
+class Point;
+class Rect;
+class Vector2d;
+}
+
+namespace ui {
+class EventTargeter;
+}
+
+namespace mojo {
+class View;
+}
+
+namespace window_manager {
+
+class TestView;
+class ViewTargeter;
+class WindowManagerApp;
+
+// A wrapper class around mojo::View; we can't subclass View to implement the
+// event targeting interfaces, so we create a separate object which observes
+// the View and ties its lifetime to it.
+//
+// We set ourselves as a property of the view passed in, and we are owned by
+// said View.
+class ViewTarget : public ui::EventTarget {
+ public:
+  ~ViewTarget() override;
+
+  // Returns the ViewTarget for a View. ViewTargets are owned by the |view|
+  // passed in, and are created on demand.
+  static ViewTarget* TargetFromView(mojo::View* view);
+
+  // Converts |point| from |source|'s coordinates to |target|'s. If |source| is
+  // NULL, the function returns without modifying |point|. |target| cannot be
+  // NULL.
+  static void ConvertPointToTarget(const ViewTarget* source,
+                                   const ViewTarget* target,
+                                   gfx::Point* point);
+
+  mojo::View* view() { return view_; }
+
+  // TODO(erg): Make this const once we've removed aura from the tree and it's
+  // feasible to change all callers of the EventTargeter interface to pass and
+  // accept const objects. (When that gets done, re-const the
+  // EventTargetIterator::GetNextTarget and EventTarget::GetChildIterator
+  // interfaces.)
+  std::vector<ViewTarget*> GetChildren() const;
+
+  const ViewTarget* GetParent() const;
+  gfx::Rect GetBounds() const;
+  bool HasParent() const;
+  bool IsVisible() const;
+
+  const ViewTarget* GetRoot() const;
+
+  // Sets a new ViewTargeter for the view, and returns the previous
+  // ViewTargeter.
+  scoped_ptr<ViewTargeter> SetEventTargeter(scoped_ptr<ViewTargeter> targeter);
+
+  // Overridden from ui::EventTarget:
+  bool CanAcceptEvent(const ui::Event& event) override;
+  EventTarget* GetParentTarget() override;
+  scoped_ptr<ui::EventTargetIterator> GetChildIterator() const override;
+  ui::EventTargeter* GetEventTargeter() override;
+  void ConvertEventToTarget(ui::EventTarget* target,
+                            ui::LocatedEvent* event) override;
+
+ private:
+  friend class TestView;
+  explicit ViewTarget(mojo::View* view_to_wrap);
+
+  bool ConvertPointForAncestor(const ViewTarget* ancestor,
+                               gfx::Point* point) const;
+  bool ConvertPointFromAncestor(const ViewTarget* ancestor,
+                                gfx::Point* point) const;
+  bool GetTargetOffsetRelativeTo(const ViewTarget* ancestor,
+                                 gfx::Vector2d* offset) const;
+
+  // The mojo::View that we dispatch to.
+  mojo::View* view_;
+
+  scoped_ptr<ViewTargeter> targeter_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewTarget);
+};
+
+}  // namespace window_manager
+
+#endif  // SERVICES_WINDOW_MANAGER_VIEW_TARGET_H_