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Side by Side Diff: chrome/browser/ui/panels/auto_hide_bottom_bar.h

Issue 7646003: Support auto-hide taskbar for panels on Windows. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
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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.
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.
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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