Qt4之改變窗體顯示風格

可以利用QStyleFactory獲得當前系統支持的窗體風格，也可以調用QApplication::setStyle(）改變窗體的風格。

本實例通過一個顯示風格可變窗體，通過下拉列表框中的選擇，改變窗體的顯示風格。

代碼如下所示：

style.h:

1. #ifndef STYLE_H
2. #define STYLE_H
4. #include <QDialog>
6. class QFrame;
8. class Style : public QDialog
9. {
10. Q_OBJECT
11. public:
12. Style(QWidget *parent=0);
14. void createLeftLayout();
15. void createRightLayout();
17. public slots:
18. void slotChangeStyle(QString);
20. private:
21. QFrame *leftFrame;
22. QFrame *rightFrame;
23. };
25. #endif // STYLE_H

1. #include "style.h"
3. #include <QtGui>
5. Style::Style(QWidget *parent)
6. :QDialog(parent)
7. {
8. setWindowTitle(tr("Change Window Style"));
10. createLeftLayout();
11. createRightLayout();
13. QHBoxLayout *mainLayout = new QHBoxLayout;
14. mainLayout->setMargin(10);
15. mainLayout->setSpacing(5);
16. mainLayout->addWidget(leftFrame);
17. mainLayout->addWidget(rightFrame);
18. setLayout(mainLayout);
19. }
21. void
22. Style::createLeftLayout()
23. {
24. leftFrame = new QFrame;
25. leftFrame->setFrameStyle(QFrame::Panel|QFrame::Raised);
26. QComboBox *styleComboBox = new QComboBox;
27. styleComboBox->addItems(QStyleFactory::keys());
29. QPushButton *button = new QPushButton(tr("pushbutton"));
30. QHBoxLayout *hbox = new QHBoxLayout;
31. hbox->addWidget(styleComboBox);
32. hbox->addWidget(button);
34. QSpinBox *spinBox = new QSpinBox;
35. spinBox->setRange(0,9);
36. QLineEdit *lineEdit = new QLineEdit;
37. lineEdit->setText("Hello Hello");
39. QGroupBox *group = new QGroupBox;
40. QRadioButton *radio1 = new QRadioButton(tr("radiobutton1"),group);
41. QRadioButton *radio2 = new QRadioButton(tr("radiobutton2"),group);
42. QRadioButton *radio3 = new QRadioButton(tr("radiobutton3"),group);
43. QCheckBox *checkBox = new QCheckBox(tr("checkbox"),group);
44. QVBoxLayout *groupLayout = new QVBoxLayout;
45. groupLayout->addWidget(radio1);
46. groupLayout->addWidget(radio2);
47. groupLayout->addWidget(radio3);
48. groupLayout->addWidget(checkBox);
49. group->setLayout(groupLayout);
51. QVBoxLayout *vbox = new QVBoxLayout;
52. vbox->addLayout(hbox);
53. vbox->addWidget(spinBox);
54. vbox->addWidget(lineEdit);
55. vbox->addWidget(group);
57. leftFrame->setLayout(vbox);
59. connect(styleComboBox,SIGNAL(activated(QString)),this,SLOT(slotChangeStyle(QString)));
60. slotChangeStyle(QStyleFactory::keys()[0]);
61. }
63. void
64. Style::createRightLayout()
65. {
66. rightFrame = new QFrame;
67. rightFrame->setFrameStyle(QFrame::Panel|QFrame::Raised);
69. QSlider * slider = new QSlider(Qt::Horizontal);
70. QTableWidget *table = new QTableWidget;
71. table->setColumnCount(3);
72. table->setRowCount(4);
73. QTextEdit *edit = new QTextEdit;
74. edit->setText("Hello World!\n Qt by Trolltech is the standard framework for developing high-performance cross-platform applications.Qt provides single-source portability across Microsoft Windows, Mac OS X, Linux, all major commercial Unix variants, and embedded Linux. On embedded Linux, the Qt API is available as Qtopia Core.");
75. QVBoxLayout *layout = new QVBoxLayout;
76. layout->setSpacing(10);
77. layout->addWidget(slider);
78. layout->addWidget(table);
79. layout->addWidget(edit);
81. rightFrame->setLayout(layout);
82. }
84. void
85. Style::slotChangeStyle(QString style)
86. {
88. QApplication::setStyle(QStyleFactory::create(style));
89. QApplication::setPalette(QApplication::style()->standardPalette());
90. }

main.cpp:

1. #include <QApplication>
2. #include "style.h"
4. int
5. main(int argc, char * argv[])
6. {
7. QApplication app(argc,argv);
8. Style s;
9. s.show();
10. return app.exec();
11. }