| // 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 "ui/aura/window_observer.h" |
| #include "ui/events/event_handler.h" |
| #include "ui/gfx/point.h" |
| #include "ui/views/widget/widget_observer.h" |
| |
| namespace ash { |
| |
| const float kDefaultPartialMagnifiedScale = 1.5f; |
| const float kNonPartialMagnifiedScale = 1.0f; |
| |
| // 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 PartialMagnificationController |
| : public ui::EventHandler, |
| public aura::WindowObserver, |
| public views::WidgetObserver { |
| public: |
| PartialMagnificationController(); |
| virtual ~PartialMagnificationController(); |
| |
| // Enables (or disables if |enabled| is false) partial screen magnifier |
| // feature. |
| virtual void SetEnabled(bool enabled); |
| |
| bool is_enabled() const { return is_enabled_; } |
| |
| // Sets the magnification ratio. 1.0f means no magnification. |
| void SetScale(float scale); |
| |
| // Returns the current magnification ratio. |
| float GetScale() const { return scale_; } |
| |
| private: |
| void OnMouseMove(const gfx::Point& location_in_root); |
| |
| // 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 SwitchTargetRootWindow(aura::Window* new_root_window); |
| |
| // Returns the root window that contains the mouse cursor. |
| aura::Window* GetCurrentRootWindow(); |
| |
| // Return true if the magnification scale > kMinPartialMagnifiedScaleThreshold |
| bool IsPartialMagnified() const; |
| |
| // Create the magnifier window. |
| void CreateMagnifierWindow(); |
| |
| // Cleans up the window if needed. |
| void CloseMagnifierWindow(); |
| |
| // Removes this as an observer of the zoom widget and the root window. |
| void RemoveZoomWidgetObservers(); |
| |
| // ui::EventHandler overrides: |
| virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE; |
| |
| // Overridden from WindowObserver: |
| virtual void OnWindowDestroying(aura::Window* window) OVERRIDE; |
| |
| // Overridden from WidgetObserver: |
| virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE; |
| |
| // True if the magnified window is in motion of zooming or un-zooming effect. |
| // Otherwise, false. |
| bool is_on_zooming_; |
| |
| bool is_enabled_; |
| |
| // Current scale, origin (left-top) position of the magnification window. |
| float scale_; |
| gfx::Point origin_; |
| |
| views::Widget* zoom_widget_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PartialMagnificationController); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_ |