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Side by Side Diff: ash/magnifier/partial_magnification_controller.h

Issue 10915140: Add the partial screen magnifier to Chrome OS. (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: Code review fixes Created 8 years, 1 month ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
6 #define ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
7
8 #include "ui/aura/event_filter.h"
9 #include "ui/aura/window_observer.h"
10 #include "ui/gfx/point.h"
11 #include "ui/views/widget/widget_observer.h"
12
13 namespace aura {
14 class RootWindow;
15 }
16
17 namespace ash {
18
19 const float kDefaultPartialMagnifiedScale = 1.5f;
20 const float kNonPartialMagnifiedScale = 1.0f;
21
22 // Controls the partial screen magnifier, which is a small area of the screen
23 // which is zoomed in. The zoomed area follows the mouse cursor when enabled.
24 class PartialMagnificationController
25 : public aura::EventFilter,
26 public aura::WindowObserver,
27 public views::WidgetObserver {
28 public:
29 PartialMagnificationController();
30 virtual ~PartialMagnificationController();
31
32 // Enables (or disables if |enabled| is false) partial screen magnifier
33 // feature.
34 void SetEnabled(bool enabled);
35
36 bool IsEnabled() const;
sky 2012/11/12 15:23:46 is_enabled() and inline.
Zachary Kuznia 2012/11/13 08:16:15 Done.
37
38 // Sets the magnification ratio. 1.0f means no magnification.
39 void SetScale(float scale);
40
41 // Returns the current magnification ratio.
42 float GetScale() const { return scale_; }
43
44 private:
45 void OnMouseMove(const gfx::Point& location_in_root);
46
47 // Switch PartialMagnified RootWindow to |new_root_window|. This does
48 // following:
49 // - Remove the magnifier from the current root window.
50 // - Create a magnifier in the new root_window |new_root_window|.
51 // - Switch the target window from current window to |new_root_window|.
52 void SwitchTargetRootWindow(aura::RootWindow* new_root_window);
53
54 // Returns the root window that contains the mouse cursor.
55 aura::RootWindow* GetCurrentRootWindow();
56
57 // Return true if the magnification scale > kMinPartialMagnifiedScaleThreshold
58 bool IsPartialMagnified() const;
59
60 // Create the magnifier window.
61 void CreateMagnifierWindow();
62
63 // Cleans up the window if needed.
64 void CloseMagnifierWindow();
65
66 // Removes this as an observer of the zoom widget and the root window.
67 void RemoveZoomWidgetObservers();
68
69 // aura::EventFilter overrides:
70 virtual bool PreHandleKeyEvent(aura::Window* target,
71 ui::KeyEvent* event) OVERRIDE;
72 virtual bool PreHandleMouseEvent(aura::Window* target,
73 ui::MouseEvent* event) OVERRIDE;
74 virtual ui::EventResult PreHandleTouchEvent(
75 aura::Window* target,
76 ui::TouchEvent* event) OVERRIDE;
77 virtual ui::EventResult PreHandleGestureEvent(
78 aura::Window* target,
79 ui::GestureEvent* event) OVERRIDE;
80
81 // Overridden from WindowObserver:
82 virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
83
84 // Overridden from WidgetObserver:
85 virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
86
87 // True if the magnified window is in motion of zooming or un-zooming effect.
88 // Otherwise, false.
89 bool is_on_zooming_;
90
91 bool is_enabled_;
92
93 // Current scale, origin (left-top) position of the magnification window.
94 float scale_;
95 gfx::Point origin_;
96
97 views::Widget* zoom_widget_;
98
99 DISALLOW_COPY_AND_ASSIGN(PartialMagnificationController);
100 };
101
102 } // namespace ash
103
104 #endif // ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
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