Qt4之保存窗體狀態

在Qt的使用過程中，我們使用Qsetting來保存程序的狀態。使得當用戶再次打開時，窗體仍然可以呈現半閉時的狀態。

下面我舉一個簡單的例子加以說明：

貼上代碼：

setting.h:

1. #ifndef SETTINGS_H
2. #define SETTINGS_H
4. #include <QDialog>
6. class QPushButton;
7. class QLabel;
8. class QTextEdit;
10. class Settings : public QDialog
11. {
12. Q_OBJECT
13. public:
14. Settings();
16. QLabel *label;
17. QPushButton *colorBtn;
18. QTextEdit *edit;
20. void readSettings();
21. void writeSettings();
23. protected:
24. void closeEvent(QCloseEvent *);
26. public slots:
27. void slotColor();
28. };
30. #endif // SETTINGS_H

1. #include "settings.h"
2. #include <QtGui>
4. Settings::Settings()
5. {
6. setWindowTitle("Settings");
8. label = new QLabel;
9. label->setText("Setting Test");
11. colorBtn = new QPushButton;
12. colorBtn->setText("Select Color");
14. edit = new QTextEdit;
16. QGridLayout *layout = new QGridLayout(this);
17. layout->addWidget(label,0,0);
18. layout->addWidget(colorBtn,0,1);
19. layout->addWidget(edit,1,0,1,2);
21. readSettings();
23. connect(colorBtn, SIGNAL(clicked()), this, SLOT(slotColor()));
24. }
26. void
27. Settings::slotColor()
28. {
29. QColor color = QColorDialog::getColor (Qt::blue);
31. if(color.isValid())
32. {
33. QPalette p = label->palette();
34. p.setColor(QPalette::Normal,QPalette::WindowText,color);
35. label->setPalette(p);
36. }
37. }
39. void
40. Settings::readSettings()
41. {
42. QSettings setting("MyPro","settings");
43. setting.beginGroup("Dialog");
44. QPoint pos = setting.value("position").toPoint();
45. QSize size = setting.value("size").toSize();
46. setting.endGroup();
48. setting.beginGroup("Content");
49. QColor color = setting.value("color").value<QColor>();
50. QString text = setting.value("text").toString();
51. setting.endGroup();
53. move(pos);
54. resize(size);
55. QPalette p = label->palette();
56. p.setColor(QPalette::Normal,QPalette::WindowText,color);
57. label->setPalette(p);
58. edit->setPlainText(text);
59. }
61. void
62. Settings::writeSettings()
63. {
64. QSettings setting("MyPro","settings");
65. setting.beginGroup("Dialog");
66. setting.setValue("position",pos());
67. setting.setValue("size",size());
68. setting.endGroup();
70. setting.beginGroup("Content");
71. setting.setValue("color",label->palette().color(QPalette::WindowText));
72. setting.setValue("text",edit->toPlainText());
73. setting.endGroup();
74. }
76. void
77. Settings::closeEvent(QCloseEvent *e)
78. {
79. writeSettings();
80. }