| // 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. |
| |
| #ifndef ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_ |
| #define ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_ |
| |
| #include <memory> |
| |
| #include "ash/ash_export.h" |
| #include "base/macros.h" |
| #include "ui/events/event_handler.h" |
| #include "ui/gfx/geometry/point.h" |
| #include "ui/gfx/geometry/size.h" |
| |
| namespace aura { |
| class Window; |
| } |
| |
| namespace ui { |
| class LocatedEvent; |
| struct PointerDetails; |
| } // namespace ui |
| |
| namespace ash { |
| |
| class MagnifierGlass; |
| |
| // Controls the partial screen magnifier, which is a small area of the screen |
| // which is zoomed in. The zoomed area follows the mouse cursor when enabled. |
| class ASH_EXPORT PartialMagnificationController : public ui::EventHandler { |
| public: |
| PartialMagnificationController(); |
| ~PartialMagnificationController() override; |
| |
| // Turns the partial screen magnifier feature on or off. Turning the magnifier |
| // on does not imply that it will be displayed; the magnifier is only |
| // displayed when it is both enabled and active. |
| void SetEnabled(bool enabled); |
| |
| // Switch PartialMagnified RootWindow to |new_root_window|. This does |
| // following: |
| // - Remove the magnifier from the current root window. |
| // - Create a magnifier in the new root_window |new_root_window|. |
| // - Switch the target window from current window to |new_root_window|. |
| void SwitchTargetRootWindowIfNeeded(aura::Window* new_root_window); |
| |
| private: |
| friend class PartialMagnificationControllerTestApi; |
| |
| // ui::EventHandler: |
| void OnTouchEvent(ui::TouchEvent* event) override; |
| |
| // Enables or disables the actual magnifier window. |
| void SetActive(bool active); |
| |
| // Contains common logic between OnMouseEvent and OnTouchEvent. |
| void OnLocatedEvent(ui::LocatedEvent* event, |
| const ui::PointerDetails& pointer_details); |
| |
| bool is_enabled_ = false; |
| bool is_active_ = false; |
| |
| std::unique_ptr<MagnifierGlass> magnifier_glass_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PartialMagnificationController); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_ |