Qt QColorDialog QErrorMessage QFileDialog QFontDialog QProgressDialog 等对话框的使用测试

测试程序 界面:

main文件就省略了

//对话框头文件

// chapter2/builtin/src/builtindlg.h.

1. #ifndef _BUILTINDLG_H_

2. #define _BUILTINDLG_H_

3. #include <QtGui/QDialog>

4. class QTextEdit;

5. class QPushButton;

6. class CBuiltinDlg : public QDialog

7. {

8.  Q_OBJECT

9. public:

10. CBuiltinDlg(QWidget* = 0);

11. virtual ~CBuiltinDlg() { }

12. private:

13. QTextEdit*displayTextEdit;

14. QPushButton*colorPushBtn;

15. QPushButton*errorPushBtn;

16. QPushButton*filePushBtn;

17. QPushButton*fontPushBtn;

18. QPushButton*inputPushBtn;

19. QPushButton*pagePushBtn;

20. QPushButton*progressPushBtn;

21. QPushButton*printPushBtn;

22. private slots:

23. void doPushBtn();

24. };

25. #endif

私有变量定义了8个按钮和一个文本编辑框.

还定义了一个私有槽,在其中做一些逻辑判断分别对不同的按钮进行响应.

//对话框的源文件

// chapter2/builtin/src/builtindlg.cpp.

1. #include <QtGui/QtGui>

2. #include "builtindlg.h"

4. CBuiltinDlg::CBuiltinDlg(QWidget* parent)

5.  :QDialog(parent)

6. {

7. displayTextEdit = new QTextEdit(tr("Qt的标准通用对话框。"));

9. QGridLayout* gridLayout = new QGridLayout;

10. colorPushBtn = new QPushButton(tr("颜色对话框"));

11. errorPushBtn = new QPushButton(tr("错误信息框"));

12. filePushBtn = new QPushButton(tr("文件对话框"));

13. fontPushBtn = new QPushButton(tr("字体对话框"));

14. inputPushBtn = new QPushButton(tr("输入对话框"));

15. pagePushBtn = new QPushButton(tr("页设置对话框"));

16. progressPushBtn = new QPushButton(tr("进度对话框"));

17. printPushBtn= new QPushButton(tr("打印对话框"));

18. gridLayout->addWidget(colorPushBtn, 0, 0, 1, 1);

19. gridLayout->addWidget(errorPushBtn, 0, 1, 1, 1);

20. gridLayout->addWidget(filePushBtn, 0, 2, 1, 1);

21. gridLayout->addWidget(fontPushBtn, 1, 0, 1, 1);

22. gridLayout->addWidget(inputPushBtn, 1, 1, 1, 1);

23. gridLayout->addWidget(pagePushBtn, 1, 2, 1, 1);

24. gridLayout->addWidget(progressPushBtn, 2, 0, 1, 1);

25. gridLayout->addWidget(printPushBtn, 2, 1, 1, 1);

26. gridLayout->addWidget(displayTextEdit, 3, 0, 3, 3);

28. setLayout(gridLayout);

30.  connect(colorPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

31.  connect(errorPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

32. connect(filePushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

33.  connect(fontPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

34. connect(inputPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

35.  connect(pagePushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

36. connect(progressPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

37. connect(printPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

38. setWindowTitle(tr("內建对话框"));

39. resize(400, 300);

40. }

41. void CBuiltinDlg::doPushBtn()

42. {

43. QPushButton* btn = qobject_cast<QPushButton*>(sender());

44. if(btn == colorPushBtn)

45. {// 颜色对话框.

46. QPalette palette = displayTextEdit->palette();

47. const QColor& color 

48. = QColorDialog::getColor(palette.color(QPalette::Base), this);

49. if(color.isValid())

50. {

51. palette.setColor(QPalette::Base, color);

52. displayTextEdit->setPalette(palette);

53. }

54. }

55. else if(btn == errorPushBtn)

56. {// 错误信息框.

57. QErrorMessage box(this);

58. box.setWindowTitle(tr("错误信息框"));

59. box.showMessage(tr("错误信息框实例xx。"));

60. box.showMessage(tr("错误信息框实例xx。"));

61. box.showMessage(tr("错误信息框实例xx。"));

62. box.showMessage(tr("错误信息框实例yy。"));

63. box.showMessage(tr("错误信息框实例zz。"));

64. box.exec();

65. }

66. else if(btn == filePushBtn)

67. {// 文件对话框.

68. QString fileName = QFileDialog::getOpenFileName(this, 

69.             tr("打开文件"),

70.                                                                    "/usr/local/Trolltech",

71.                                                                    tr("任何文件(*.*)"

72.                                                                      ";;文本文件(*.txt)"

73. ";;XML文件(*.xml)"));

74. displayTextEdit->setText(fileName);

75. }

76. else if(btn == fontPushBtn)

77. {// 字体对话框.

78. bool ok;

79. const QFont& font = QFontDialog::getFont(&ok,

80. displayTextEdit->font(),

81. this,

82. tr("字体对话框"));

83. if(ok)

84. {// 如果<确定>,设置字体.

85. displayTextEdit->setFont(font);

86. }

87. }

88. else if(btn == inputPushBtn)

89. {// 输入对话框.

90. bool ok;

91.      QString text = QInputDialog::getText(this, 

92. tr("输入对话框"),

93.                                           tr("输入文本："), 

94. QLineEdit::Normal,

95.                                           QDir::home().dirName(), 

96. &ok);

97.      if (ok && !text.isEmpty())

98.          displayTextEdit->setText(text);

99. }

100. else if(btn == pagePushBtn)

101. {// 页设置对话框.

102. QPrinter printer;

103. QPageSetupDialog dlg(&printer, this);

104. dlg.setWindowTitle(tr("页设置对话框"));

105. if (dlg.exec() == QDialog::Accepted) 

106. {

107. // 进行下一步的处理。

108.  }

109. } 

110. else if(btn == progressPushBtn)

111. {// 进度对话框.

112. QProgressDialog progress(tr("正在复制文件..."), tr("取消"), 0, 10000, this);

113. progress.setWindowModality(Qt::WindowModal);

114. progress.setWindowTitle(tr("进度对话框"));

115. progress.show();

116. for (int i = 0; i < 10000; i++) 

117. {

118. progress.setValue(i);

119. qApp->processEvents();

120. if (progress.wasCanceled())

121. break;

122. //... 复制文件处理。

123. qDebug() << i;

124. }

125. progress.setValue(10000);

126. }

128. else if(btn == printPushBtn)

129. {// 打印对话框.

130. QPrinter printer;

131. QPrintDialog dlg(&printer, this);

132. dlg.setWindowTitle(tr("打印对话框"));

133. if (dlg.exec() == QDialog::Accepted) 

134. {

135. // 进行下一步的处理。

136.  }

137. }

源文件中只实现了两个函数,构造函数和按钮响应函数.

构造函数主要实现了,按钮和文本编辑框的创建,控件的布局,把所有的按钮的信号都连接到doPushBtn()槽上.

doPushBtn()函数比较重要的是如何判断按下的是哪个按钮.

sender()返回一个信号源指针,  然后给它投射成特定的指针qobject_cast<QPushButton *> 这样就有了发射按钮的指针.