Mercurial > projects > qtd
comparison demos/browser/autosaver.d @ 73:7bfd46c330dc
more porting
author | mandel |
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date | Fri, 22 May 2009 10:59:00 +0000 |
parents | 71b382c10ef6 |
children | 37caa90ce503 |
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72:b149ef2cb18b | 73:7bfd46c330dc |
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38 ** $QT_END_LICENSE$ | 38 ** $QT_END_LICENSE$ |
39 ** | 39 ** |
40 ****************************************************************************/ | 40 ****************************************************************************/ |
41 module autosaver; | 41 module autosaver; |
42 | 42 |
43 import QtCore.QObject; | |
44 import QtCore.QBasicTimer; | |
45 import QtCore.QTime; | |
46 | 43 |
47 import QtCore.QDir; | 44 import qt.core.QObject; |
48 import QtCore.QCoreApplication; | 45 import qt.core.QBasicTimer; |
49 import QtCore.QMetaObject; | 46 import qt.core.QTime; |
47 import qt.core.QDir; | |
48 import qt.core.QCoreApplication; | |
49 import qt.core.QMetaObject; | |
50 | |
50 import QtDebug; | 51 import QtDebug; |
52 | |
51 | 53 |
52 const uint AUTOSAVE_IN = 1000 * 3 // seconds | 54 const uint AUTOSAVE_IN = 1000 * 3 // seconds |
53 const uint MAXWAIT = 1000 * 15 // seconds | 55 const uint MAXWAIT = 1000 * 15 // seconds |
54 | 56 |
57 | |
55 /* | 58 /* |
56 This class will call the save() slot on the parent object when the parent changes. | 59 This class will call the save() slot on the parent object when the parent changes. |
57 It will wait several seconds after changed() to combining multiple changes and | 60 It will wait several seconds after changed() to combining multiple changes and |
58 prevent continuous writing to disk. | 61 prevent continuous writing to disk. |
59 */ | 62 */ |
63 | |
60 class AutoSaver : public QObject { | 64 class AutoSaver : public QObject { |
61 | 65 |
62 Q_OBJECT | 66 public: |
67 | |
68 this(QObject parent) | |
69 { | |
70 super(parent); | |
71 assert(parent); | |
72 } | |
73 | |
74 ~this(); | |
75 { | |
76 if (m_timer.isActive()) | |
77 qWarning() << "AutoSaver: still active when destroyed, changes not saved."; | |
78 } | |
79 | |
80 void saveIfNeccessary() | |
81 { | |
82 if (!m_timer.isActive()) | |
83 return; | |
84 m_timer.stop(); | |
85 m_firstChange = QTime(); | |
86 if (!QMetaObject.invokeMethod(parent(), "save", Qt.DirectConnection)) { | |
87 qWarning() << "AutoSaver: error invoking slot save() on parent"; | |
88 } | |
89 } | |
63 | 90 |
64 public: | 91 public: |
65 this(QObject *parent) | 92 |
66 { | 93 void changeOccurred(); |
67 super(parent); | 94 { |
68 Q_ASSERT(parent); | 95 if (m_firstChange.isNull()) |
69 } | 96 m_firstChange.start(); |
70 ~this(); | 97 |
71 { | 98 if (m_firstChange.elapsed() > MAXWAIT) { |
72 if (m_timer.isActive()) | 99 saveIfNeccessary(); |
73 qWarning() << "AutoSaver: still active when destroyed, changes not saved."; | 100 } else { |
74 } | 101 m_timer.start(AUTOSAVE_IN, this); |
75 void saveIfNeccessary() | 102 } |
76 { | 103 } |
77 if (!m_timer.isActive()) | 104 |
78 return; | 105 protected: |
79 m_timer.stop(); | 106 |
80 m_firstChange = QTime(); | 107 void timerEvent(QTimerEvent event) |
81 if (!QMetaObject::invokeMethod(parent(), "save", Qt::DirectConnection)) { | 108 { |
82 qWarning() << "AutoSaver: error invoking slot save() on parent"; | 109 if (event.timerId() == m_timer.timerId()) { |
83 } | 110 saveIfNeccessary(); |
111 } else { | |
112 QObject.timerEvent(event); | |
113 } | |
114 } | |
115 | |
116 private: | |
117 | |
118 QBasicTimer m_timer; | |
119 QTime m_firstChange; | |
84 } | 120 } |
85 | 121 |
86 public slots: | |
87 void changeOccurred(); | |
88 { | |
89 if (m_firstChange.isNull()) | |
90 m_firstChange.start(); | |
91 | |
92 if (m_firstChange.elapsed() > MAXWAIT) { | |
93 saveIfNeccessary(); | |
94 } else { | |
95 m_timer.start(AUTOSAVE_IN, this); | |
96 } | |
97 } | |
98 | |
99 protected: | |
100 void timerEvent(QTimerEvent *event) | |
101 { | |
102 if (event.timerId() == m_timer.timerId()) { | |
103 saveIfNeccessary(); | |
104 } else { | |
105 QObject::timerEvent(event); | |
106 } | |
107 } | |
108 | |
109 | |
110 private: | |
111 QBasicTimer m_timer; | |
112 QTime m_firstChange; | |
113 } | |
114 |