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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, 2 months 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 namespace aura {
9 class RootWindow;
10 }
11
12 namespace ash {
13 namespace internal {
14
15 const float kDefaultPartialMagnifiedScale = 1.5f;
16 const float kNonPartialMagnifiedScale = 1.0f;
17
18 // Controls the partial screen magnifier, which is a small area of the screen
19 // which is zoomed in. The zoomed area follows the mouse cursor when enabled.
20 class PartialMagnificationController {
sky 2012/10/11 17:00:49 Is there a reason to make this pure virtual?
Zachary Kuznia 2012/10/12 08:41:35 It's done this way in order to match the style of
sky 2012/10/12 17:09:19 Is there a reason for that?
Zachary Kuznia 2012/10/15 08:28:40 Apparently the reason was to keep the header file
21 public:
22 virtual ~PartialMagnificationController() {}
23
24 // Creates a new PartialMagnificationController. The caller takes ownership
25 // of the returned object.
26 static PartialMagnificationController* CreateInstance();
27
28 // Enables (or disables if |enabled| is false) partial screen magnifier
29 // feature.
30 virtual void SetEnabled(bool enabled) = 0;
31
32 virtual bool IsEnabled() const = 0;
33
34 // Sets the magnification ratio. 1.0f means no magnification.
35 virtual void SetScale(float scale) = 0;
36
37 // Returns the current magnification ratio.
38 virtual float GetScale() const = 0;
39
40 protected:
41 PartialMagnificationController() {}
42 };
43
44 } // namespace internal
45 } // namespace ash
46
47 #endif // ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
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