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1 // Copyright (c) 2011 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 CHROME_BROWSER_UI_PANELS_AUTO_HIDE_BOTTOM_BAR_H_ | |
6 #define CHROME_BROWSER_UI_PANELS_AUTO_HIDE_BOTTOM_BAR_H_ | |
7 #pragma once | |
8 | |
9 #include "base/memory/ref_counted.h" | |
10 | |
11 namespace gfx { | |
12 class Rect; | |
13 } | |
14 | |
15 // Encapsulates the logic to deal with always-on-top system/app bar that is | |
16 // located at the bottom of the screen and set to auto-hide, like Windows | |
jennb
2011/08/23 20:28:34
Just thinking ahead: this one handles bottom of s
jianli
2011/08/26 00:18:16
Refactored to handle all other edges.
| |
17 // taskbar or MacOSX dock. | |
18 // Note that the ref count is needed by using PostTask in the implementation of | |
19 // MockAutoHideBottomBar that derives from AutoHideBottomBar. | |
20 class AutoHideBottomBar : public base::RefCountedThreadSafe<AutoHideBottomBar> { | |
21 public: | |
22 enum Visibility { | |
23 VISIBLE, | |
24 ANIMATING, | |
25 HIDDEN | |
26 }; | |
27 | |
28 // Observer can listen to various events regarding the bottom bar changes. | |
29 class Observer { | |
30 public: | |
31 virtual void OnAutoHideBottomBarVisibilityChanged( | |
32 Visibility visibility) = 0; | |
33 virtual void OnAutoHideBottomBarHeightChanged(int height) = 0; | |
34 }; | |
35 | |
36 static AutoHideBottomBar* Create(Observer* observer); | |
37 | |
38 virtual ~AutoHideBottomBar() { } | |
39 | |
40 // This should be called each time when the work area is changed. We only | |
41 // care about the bottom bar that sits on the screen that hosts the specified | |
42 // work area. | |
43 virtual void UpdateWorkArea(const gfx::Rect& work_area) = 0; | |
44 | |
45 // Returns true if the auto-hide bottom bar is enabled. | |
46 virtual bool IsEnabled() = 0; | |
jennb
2011/08/23 20:28:34
After reading more, I realize this value does doub
jianli
2011/08/26 00:18:16
Now it takes an alignment parameter.
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47 | |
48 // Returns the fixed height of the bottom bar. Note that the height remains | |
49 // unchanged no matter whether the bottom bar is brought up or down. | |
50 | |
jennb
2011/08/23 20:28:34
Extra blank line?
jianli
2011/08/26 00:18:16
Not needed. Removed.
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51 // Returns the height of bottom bar that corresponds to Visibility VISIBLE. | |
52 // This value does not depend on current bar's Visibility. The visible height | |
53 // of the bar when it's HIDDEN is usually between 0 and a few pixels. | |
54 virtual int GetHeight() = 0; | |
55 | |
56 virtual Visibility GetVisibility() = 0; | |
57 }; | |
58 | |
59 #endif // CHROME_BROWSER_UI_PANELS_AUTO_HIDE_BOTTOM_BAR_H_ | |
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