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1 // Copyright 2013 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_EXIT_WARNING_HANDLER_H_ | |
sky
2013/05/13 15:40:32
You missed the accelerators here, eg ASH_ACCELERAT
sschmitz
2013/05/14 16:49:11
Done.
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6 #define ASH_EXIT_WARNING_HANDLER_H_ | |
7 | |
8 #include "base/timer.h" | |
9 | |
10 namespace views { | |
11 class Widget; | |
12 } | |
13 | |
14 namespace ash { | |
15 | |
16 // In order to avoid accidental exits when the user presses the exit | |
17 // shortcut by mistake, we require the user to hold the shortcut for | |
18 // a period of time. During that time we show a popup informing the | |
19 // user of this. We exit only if the user holds the shortcut longer | |
20 // than this time limit. | |
21 // An expert user may quickly release and then press again (double press) | |
22 // for immediate exit. The press, release and press must happend within | |
sky
2013/05/13 15:40:32
happend -> happen
sschmitz
2013/05/14 16:49:11
Done.
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23 // the double press time limit. | |
24 // If the user releases (without double press) before the required hold | |
25 // time, we will cancel the exit, but show the ui until the hold time limit | |
26 // has expired to avoid a short popup flash. | |
27 // | |
28 // State Transition Diagrams: | |
29 // | |
30 // T1 - double press time limit (short) | |
31 // T2 - hold to exit time limit (long) | |
32 // | |
33 // IDLE | |
34 // | Press | |
35 // WAIT_FOR_QUICK_RELEASE action: show ui & start timers | |
36 // | Release (DT < T1) | |
37 // WAIT_FOR_DOUBLE_PRESS | |
38 // | Press (DT < T1) | |
39 // EXITING action: hide ui, stop timers, exit | |
40 // | |
41 // IDLE | |
42 // | Press | |
43 // WAIT_FOR_QUICK_RELEASE action: show ui & start timers | |
44 // | T1 timer expires | |
45 // WAIT_FOR_LONG_HOLD | |
46 // | T2 Timer exipres | |
47 // EXITING action: hide ui, exit | |
48 // | |
49 // IDLE | |
50 // | Press | |
51 // WAIT_FOR_QUICK_RELEASE action: show ui & start timers | |
52 // | T1 timer expiers | |
53 // WAIT_FOR_LONG_HOLD | |
54 // | Release | |
55 // CANCELED | |
56 // | T2 timer expires | |
57 // IDLE action: hide ui | |
58 // | |
59 // IDLE | |
60 // | Press | |
61 // WAIT_FOR_QUICK_RELEASE action: show ui & start timers | |
62 // | Release (DT < T1) | |
63 // WAIT_FOR_DOUBLE_PRESS | |
64 // | T1 timer expires | |
65 // CANCELED | |
66 // | T2 timer expires | |
67 // IDLE action: hide ui | |
68 // | |
69 | |
70 class ExitWarningHandler { | |
71 public: | |
72 | |
sky
2013/05/13 15:40:32
nit: no newline here.
sschmitz
2013/05/14 16:49:11
Done.
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73 ExitWarningHandler(); | |
74 | |
75 ~ExitWarningHandler(); | |
76 | |
77 void HandleExitKey(bool press); | |
sky
2013/05/13 15:40:32
Document what press is.
sschmitz
2013/05/14 16:49:11
Done.
sky
2013/05/14 17:10:05
It still isn't clear that |press| is true on a pre
| |
78 | |
79 private: | |
80 void Timer1Action(); | |
sky
2013/05/13 15:40:32
These need a description.
sschmitz
2013/05/14 16:49:11
Done.
| |
81 void Timer2Action(); | |
82 | |
83 void StartTimers(); | |
84 void CancelTimers(); | |
85 | |
86 void Show(); | |
87 void Hide(); | |
88 | |
89 enum State { | |
sky
2013/05/13 15:40:32
enums should be first in section.
sschmitz
2013/05/14 16:49:11
Done.
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90 IDLE, | |
91 WAIT_FOR_QUICK_RELEASE, | |
92 WAIT_FOR_DOUBLE_PRESS, | |
93 WAIT_FOR_LONG_HOLD, | |
94 CANCELED, | |
95 EXITING | |
96 }; | |
97 | |
98 State state_; | |
99 views::Widget* widget_; | |
sky
2013/05/13 15:40:32
Document ownership.
sschmitz
2013/05/14 16:49:11
Done.
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100 base::OneShotTimer<ExitWarningHandler> timer1_; // short; double press | |
101 base::OneShotTimer<ExitWarningHandler> timer2_; // long; hold to exit | |
102 }; | |
sky
2013/05/13 15:40:32
DISALLOW_...
sschmitz
2013/05/14 16:49:11
Done.
| |
103 | |
104 } | |
105 | |
106 #endif | |
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