各类消息框的使用

代码：
 1 #coding: utf-8
 2 from PyQt4.QtGui import *
 3 from PyQt4.QtCore import *
 4 import sys
 5 
 6 QTextCodec.setCodecForTr(QTextCodec.codecForName("utf8"))
 7 
 8 class MessageBoxDlg(QDialog):
 9     def __init__(self, parent=None):
10         super(MessageBoxDlg, self).__init__(parent)
11         self.setWindowTitle("Messagebox")
12         self.label = QLabel("About Qt MessageBox")
13         questionButton = QPushButton("Question")
14         informationButton = QPushButton("Information")
15         warningButton = QPushButton("Warning")
16         criticalButton = QPushButton("Critical")
17         aboutButton = QPushButton("About")
18         aboutqtButton = QPushButton("About Qt")
19         customButton = QPushButton("Custom")
20 
21         gridLayout = QGridLayout(self)
22         gridLayout.addWidget(self.label, 0, 0, 1, 2)
23         gridLayout.addWidget(questionButton, 1, 0)
24         gridLayout.addWidget(informationButton, 1, 1)
25         gridLayout.addWidget(warningButton, 2, 0)
26         gridLayout.addWidget(criticalButton, 2, 1)
27         gridLayout.addWidget(aboutButton, 3, 0)
28         gridLayout.addWidget(aboutqtButton, 3, 1)
29         gridLayout.addWidget(customButton, 4, 0)
30 
31         self.connect(questionButton,SIGNAL("clicked()"),self.slotQuestion)
32         self.connect(informationButton,SIGNAL("clicked()"),self.slotInformation)
33         self.connect(warningButton,SIGNAL("clicked()"),self.slotWarning)
34         self.connect(criticalButton,SIGNAL("clicked()"),self.slotCritical)
35         self.connect(aboutButton,SIGNAL("clicked()"),self.slotAbout)
36         self.connect(aboutqtButton,SIGNAL("clicked()"),self.slotAboutQt)
37         self.connect(customButton,SIGNAL("clicked()"),self.slotCustom)
38 
39     def slotQuestion(self):
40         button = QMessageBox.question(self, "Question", self.tr("已到达文档结尾,是否从头查找?"), QMessageBox.Ok|QMessageBox.Cancel, QMessageBox.Ok)
41         if button == QMessageBox.Ok:
42             self.label.setText("Question button/Ok")
43         elif button == QMessageBox.Cancel:
44             self.label.setText("Question button/Cancel")
45         else:
46             return
47 
48     def slotInformation(self):
49         QMessageBox.information(self, "Information", self.tr("填写任意想告诉于用户的信息!"))
50         self.label.setText("Information MessageBox")
51 
52     def slotWarning(self):
53         button = QMessageBox.warning(self, "Warning", self.tr("是否保存对文档的修改?"), QMessageBox.Save|QMessageBox.Discard|QMessageBox.Cancel, QMessageBox.Save)
54         if button == QMessageBox.Save:
55             self.label.setText("Warning button/Save")
56         elif button == QMessageBox.Discard:
57             self.label.setText("Warning button/Discard")
58         elif button == QMessageBox.Cancel:
59             self.label.setText("Warning button/Cancel")
60         else:
61             return
62 
63     def slotCritical(self):
64         QMessageBox.critical(self, "Critical", self.tr("提醒用户一个致命的错误!"))
65         self.label.setText("Critical MessageBox")
66 
67     def slotAbout(self):
68         QMessageBox.about(self, "About", self.tr("About 示例"))
69         self.label.setText("About MessageBox")
70 
71     def slotAboutQt(self):
72         QMessageBox.aboutQt(self, "About Qt")
73         self.label.setText("About Qt MessageBox")
74 
75     def slotCustom(self):
76         customMsgBox = QMessageBox(self)
77         customMsgBox.setWindowTitle("Custom message box")
78         lockButton = customMsgBox.addButton(self.tr("锁定"), QMessageBox.AcceptRole)
79         unlockButton = customMsgBox.addButton(self.tr("解锁"), QMessageBox.ActionRole)
80         cancelButton = customMsgBox.addButton("cancel", QMessageBox.ActionRole)
81         customMsgBox.setText(self.tr("这是一个自定义的消息框！"))
82         customMsgBox.exec_()
83 
84         button = customMsgBox.clickedButton()
85         if button == lockButton:
86             self.label.setText("Custom MessageBox/Lock")
87         elif button == unlockButton:
88             self.label.setText("Custom MessageBox/Unlock")
89         elif button == cancelButton:
90             self.label.setText("Custom MessageBox/Cancel")
91 
92 app = QApplication(sys.argv)
93 MessageBox = MessageBoxDlg()
94 MessageBox.show()
95 app.exec_()