主窗口QMainWindow和启动画面

在较为大型复杂，功能较多的应用程序中，我们通常继承QMainWindow类来进行开发。该主窗口为搭建应用用户界面提供了非常好的框架，请看下图：

可以看出该主窗口类为我们提供了菜单栏(Menu Bar)、工具栏(Tool Bar)、控件停靠区域(Dock Widgets)和状态栏(Status Bar)，我们可以往其中加入很多自己想要的东西，这也使得我们可以快速地开发一个功能复杂并且界面友好的应用程序

例子一记事本应用

接下来我们完成一个简易的记事本应用来了解一下QMainWindow的用法

  1 #资料  https://blog.csdn.net/La_vie_est_belle/article/details/82819766
  2 
  3 import sys
  4 from PyQt5.QtGui import QIcon
  5 from PyQt5.QtCore import QMimeData
  6 from PyQt5.QtWidgets import QApplication, QMainWindow, QTextEdit, QAction, QFileDialog, QMessageBox,
  7                             QFontDialog, QColorDialog
  8 
  9 class Demo(QMainWindow):
 10     is_saved = True
 11     is_saved_first = True
 12     path = ''
 13 
 14     def __init__(self):
 15         super(Demo, self).__init__()
 16         self.file_menu = self.menuBar().addMenu('File') #给菜单栏添加一个菜单
 17         self.edit_menu = self.menuBar().addMenu('Edit')
 18         self.help_menu = self.menuBar().addMenu('Help')
 19 
 20         self.file_toolbar = self.addToolBar('File')  #给工具栏添加一个按钮
 21         self.edit_toolbar = self.addToolBar('Edit')
 22 
 23         self.status_bar = self.statusBar()  #设置一个状态栏
 24         #接下来我们只需要往菜单栏和工具栏上面添加各种动作——也就是QAction，该类通常与菜单栏和工具栏搭配使用。可以将一个动作看作一种命令，每当用户点击某个动作时，就会触发某种命令，程序从而执行相应的命令
 25         self.new_action = QAction('New', self) #实例化一个动作
 26         self.open_action = QAction('Open', self)
 27         self.save_action = QAction('Save', self)
 28         self.save_as_action = QAction('Save As', self)
 29         self.close_action = QAction('Close', self)
 30         self.cut_action = QAction('Cut', self)
 31         self.copy_action = QAction('Copy', self)
 32         self.paste_action = QAction('Paste', self)
 33         self.font_action = QAction('Font', self)
 34         self.color_action = QAction('Color', self)
 35         self.about_action = QAction('Qt', self)
 36 
 37         self.text_edit = QTextEdit(self)
 38         self.mime_data = QMimeData()
 39         self.clipboard = QApplication.clipboard()
 40 
 41         self.setCentralWidget(self.text_edit)  # 设置中央控件
 42         self.resize(450, 600)
 43 
 44         self.menu_init()
 45         self.toolbar_init()
 46         self.status_bar_init()
 47         self.action_init()  #执行动作函数
 48         self.text_edit_int()
 49 
 50     def action_init(self): #动作函数
 51         #图片下载地址：链接: https://pan.baidu.com/s/1Rp2-G_8PdvFfDIoIesMNEg 提取码: ag8w
 52         self.new_action.setIcon(QIcon('images/f1.ico'))  # 给动作设置图标(菜单项的左侧显示，按钮显示)
 53         self.new_action.setShortcut('Ctrl+N')  #给动作设置快捷键
 54         self.new_action.setToolTip('创建新文件')  #设置气泡提示【鼠标在工具栏按钮上时提示的内容】
 55         self.new_action.setStatusTip('Create a new file')#设置在状态栏提示的信息。当鼠标停留在该动作上时，状态栏会显示相应的信息
 56         self.new_action.triggered.connect(self.new_func)  #动作的触发信号
 57         #
 58         #self.open_action.setIcon(QIcon('images/open.ico'))
 59         self.open_action.setShortcut('Ctrl+O')
 60         self.open_action.setToolTip('Open an existing file')
 61         self.open_action.setStatusTip('Open an existing file')
 62         self.open_action.triggered.connect(self.open_file_func)
 63         #
 64         #self.save_action.setIcon(QIcon('images/save.ico'))
 65         self.save_action.setShortcut('Ctrl+S')
 66         self.save_action.setToolTip('Save the file')
 67         self.save_action.setStatusTip('Save the file')
 68         self.save_action.triggered.connect(lambda: self.save_func(self.text_edit.toHtml()))
 69         #
 70         #self.save_as_action.setIcon(QIcon('images/save_as.ico'))
 71         self.save_as_action.setShortcut('Ctrl+A')
 72         self.save_as_action.setToolTip('Save the file to a specified location')
 73         self.save_as_action.setStatusTip('Save the file to a specified location')
 74         self.save_as_action.triggered.connect(lambda: self.save_as_func(self.text_edit.toHtml()))
 75         #
 76         #self.close_action.setIcon(QIcon('images/close.ico'))
 77         self.close_action.setShortcut('Ctrl+E')
 78         self.close_action.setToolTip('Close the window')
 79         self.close_action.setStatusTip('Close the window')
 80         self.close_action.triggered.connect(self.close_func)
 81         #
 82         #self.cut_action.setIcon(QIcon('images/cut.ico'))
 83         self.cut_action.setShortcut('Ctrl+X')
 84         self.cut_action.setToolTip('Cut the text to clipboard')
 85         self.cut_action.setStatusTip('Cut the text')
 86         self.cut_action.triggered.connect(self.cut_func)
 87         #
 88         # self.copy_action.setIcon(QIcon('images/copy.ico'))
 89         self.copy_action.setShortcut('Ctrl+C')
 90         self.copy_action.setToolTip('Copy the text')
 91         self.copy_action.setStatusTip('Copy the text')
 92         self.copy_action.triggered.connect(self.copy_func)
 93         #
 94         # self.paste_action.setIcon(QIcon('images/paste.ico'))
 95         self.paste_action.setShortcut('Ctrl+V')
 96         self.paste_action.setToolTip('Paste the text')
 97         self.paste_action.setStatusTip('Paste the text')
 98         self.paste_action.triggered.connect(self.paste_func)
 99         #
100         # self.font_action.setIcon(QIcon('images/font.ico'))
101         self.font_action.setShortcut('Ctrl+T')
102         self.font_action.setToolTip('Change the font')
103         self.font_action.setStatusTip('Change the font')
104         self.font_action.triggered.connect(self.font_func)
105         #
106         self.color_action.setIcon(QIcon('images/color.ico'))
107         self.color_action.setShortcut('Ctrl+R')
108         self.color_action.setToolTip('Change the color')
109         self.color_action.setStatusTip('Change the color')
110         self.color_action.triggered.connect(self.color_func)
111         #
112         # self.about_action.setIcon(QIcon('images/about.ico'))
113         # self.about_action.setShortcut('Ctrl+Q')
114         # self.about_action.setToolTip('What is Qt?')
115         # self.about_action.setStatusTip('What is Qt?')
116         # self.about_action.triggered.connect(self.about_func)
117 
118     def text_edit_int(self):
119         self.text_edit.textChanged.connect(self.text_changed_func)
120 
121     def text_changed_func(self):
122         if self.text_edit.toPlainText():
123             self.is_saved = False
124         else:
125             self.is_saved = True
126 
127     def font_func(self):
128         font, ok = QFontDialog.getFont()
129         if ok:
130             self.text_edit.setFont(font)
131 
132     def color_func(self):
133         color = QColorDialog.getColor()
134         if color.isValid():
135             self.text_edit.setTextColor(color)
136 
137     def paste_func(self):
138         self.text_edit.insertHtml(self.clipboard.mimeData().html())
139 
140     def copy_func(self):
141         self.mime_data.setHtml(self.text_edit.textCursor().selection().toHtml())
142         self.clipboard.setMimeData(self.mime_data)
143 
144     def cut_func(self):
145         self.mime_data.setHtml(self.text_edit.textCursor().selection().toHtml())
146         self.clipboard.setMimeData(self.mime_data)
147         self.text_edit.textCursor().removeSelectedText()
148 
149     def close_func(self):
150         if not self.is_saved:
151             choice = QMessageBox.question(self, 'Save File', 'Do you want to save the text?',
152                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
153             if choice == QMessageBox.Yes:
154                 self.save_func(self.text_edit.toHtml())
155                 self.close()
156             elif choice == QMessageBox.No:
157                 self.close()
158             else:
159                 pass
160 
161     def closeEvent(self, QCloseEvent):
162         if not self.is_saved:
163             choice = QMessageBox.question(self, 'Save File', 'Do you want to save the text?',
164                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
165             if choice == QMessageBox.Yes:
166                 self.save_func(self.text_edit.toHtml())
167                 QCloseEvent.accept()
168             elif choice == QMessageBox.No:
169                 QCloseEvent.accept()
170             else:
171                 QCloseEvent.ignore()
172 
173     def save_as_func(self, text):
174         self.path, _ = QFileDialog.getSaveFileName(self, 'Save File', './', 'Files (*.html *.txt *.log)')
175         if self.path:
176             with open(self.path, 'w') as f:
177                 f.write(text)
178             self.is_saved = True
179             self.is_saved_first = False
180 
181     def open_file_func(self):
182         if not self.is_saved:
183             choice = QMessageBox.question(self, '', 'Do you want to save the text?',
184                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
185             if choice == QMessageBox.Yes:
186                 self.save_func()
187                 file, _ = QFileDialog.getOpenFileName(self, 'Open File', './', 'Files (*.html *.txt *.log)')
188                 if file:
189                     with open(file, 'r') as f:
190                         self.text_edit.clear()
191                         self.text_edit.setText(f.read())
192                         self.is_saved = True
193             elif choice == QMessageBox.No:
194                 file, _ = QFileDialog.getOpenFileName(self, 'Open File', './', 'Files (*.html *.txt *.log)')
195                 if file:
196                     with open(file, 'r') as f:
197                         self.text_edit.clear()
198                         self.text_edit.setText(f.read())
199                         self.is_saved = True
200             else:
201                 pass
202         else:
203             file, _ = QFileDialog.getOpenFileName(self, 'Open File', './', 'Files (*.html *.txt *.log)')
204             if file:
205                 with open(file, 'r') as f:
206                     self.text_edit.clear()
207                     self.text_edit.setText(f.read())
208                     self.is_saved = True
209 
210     def new_func(self):
211         if not self.is_saved:
212             choice = QMessageBox.question(self, '', 'Do you want to save the text?',
213                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
214             if choice == QMessageBox.Yes:
215                 self.save_func()
216                 self.text_edit.clear()
217             elif choice == QMessageBox.No:
218                 self.text_edit.clear()
219             else:
220                 pass
221         else:
222             self.text_edit.clear()
223 
224     def save_func(self, text):
225         if self.is_saved_first:
226             self.save_as_func(text)
227         else:
228             with open(self.path, 'w') as f:
229                 f.write(text)
230             self.is_saved = True
231 
232     def save_as_func(self, text):
233         self.path, _ = QFileDialog.getSaveFileName(self, 'Save File', './', 'Files (*.html *.txt *.log)')
234         if self.path:
235             with open(self.path, 'w') as f:
236                 f.write(text)
237             self.is_saved = True
238             self.is_saved_first = False
239 
240     def status_bar_init(self):
241         self.status_bar.showMessage('Ready to compose') #设置状态栏显示的内容
242 
243     def toolbar_init(self):
244         self.file_toolbar.addAction(self.new_action)  #给工具栏添加按钮动作
245         #注意：菜单栏、工具栏相同动作是同一个QAction对象
246         self.file_toolbar.addAction(self.open_action)
247         self.file_toolbar.addAction(self.save_action)
248         self.file_toolbar.addAction(self.save_as_action)
249 
250         self.edit_toolbar.addAction(self.cut_action)
251         self.edit_toolbar.addAction(self.copy_action)
252         self.edit_toolbar.addAction(self.paste_action)
253         self.edit_toolbar.addAction(self.font_action)
254         self.edit_toolbar.addAction(self.color_action)
255 
256     def save_func(self, text):
257         if self.is_saved_first:
258             self.save_as_func(text)
259         else:
260             with open(self.path, 'w') as f:
261                 f.write(text)
262             self.is_saved = True
263 
264     def menu_init(self):
265         self.file_menu.addAction(self.new_action) #给菜单添加一个动作
266         self.file_menu.addAction(self.open_action)
267         self.file_menu.addAction(self.save_action)
268         self.file_menu.addAction(self.save_as_action)
269         self.file_menu.addSeparator()    #加一个分割条
270         self.file_menu.addAction(self.close_action)
271 
272         self.edit_menu.addAction(self.cut_action)
273         self.edit_menu.addAction(self.copy_action)
274         self.edit_menu.addAction(self.paste_action)
275         self.edit_menu.addSeparator()
276         self.edit_menu.addAction(self.font_action)
277         self.edit_menu.addAction(self.color_action)
278 
279         self.help_menu.addAction(self.about_action)
280 
281 
282 if __name__ == '__main__':
283     app = QApplication(sys.argv)
284     demo = Demo()
285     demo.show()
286     sys.exit(app.exec_())

启动画面QSplashScreen

  1 #资料  https://blog.csdn.net/La_vie_est_belle/article/details/82819766
  2 
  3 import sys
  4 import time
  5 from PyQt5.QtGui import QIcon, QPixmap
  6 from PyQt5.QtCore import QMimeData, Qt
  7 from PyQt5.QtWidgets import QApplication, QMainWindow, QTextEdit, QAction, QFileDialog, QMessageBox,
  8                             QFontDialog, QColorDialog, QSplashScreen
  9 
 10 
 11 class Demo(QMainWindow):
 12     is_saved = True
 13     is_saved_first = True
 14     path = ''
 15 
 16     def __init__(self):
 17         super(Demo, self).__init__()
 18         self.file_menu = self.menuBar().addMenu('File') #给菜单栏添加一个菜单
 19         self.edit_menu = self.menuBar().addMenu('Edit')
 20         self.help_menu = self.menuBar().addMenu('Help')
 21 
 22         self.file_toolbar = self.addToolBar('File')  #给工具栏添加一个按钮
 23         self.edit_toolbar = self.addToolBar('Edit')
 24 
 25         self.status_bar = self.statusBar()  #设置一个状态栏
 26         #接下来我们只需要往菜单栏和工具栏上面添加各种动作——也就是QAction，该类通常与菜单栏和工具栏搭配使用。可以将一个动作看作一种命令，每当用户点击某个动作时，就会触发某种命令，程序从而执行相应的命令
 27         self.new_action = QAction('New', self) #实例化一个动作
 28         self.open_action = QAction('Open', self)
 29         self.save_action = QAction('Save', self)
 30         self.save_as_action = QAction('Save As', self)
 31         self.close_action = QAction('Close', self)
 32         self.cut_action = QAction('Cut', self)
 33         self.copy_action = QAction('Copy', self)
 34         self.paste_action = QAction('Paste', self)
 35         self.font_action = QAction('Font', self)
 36         self.color_action = QAction('Color', self)
 37         self.about_action = QAction('Qt', self)
 38 
 39         self.text_edit = QTextEdit(self)
 40         self.mime_data = QMimeData()
 41         self.clipboard = QApplication.clipboard()
 42 
 43         self.setCentralWidget(self.text_edit)  # 设置中央控件
 44         self.resize(450, 600)
 45 
 46         self.menu_init()
 47         self.toolbar_init()
 48         self.status_bar_init()
 49         self.action_init()  #执行动作函数
 50         self.text_edit_int()
 51 
 52     def action_init(self): #动作函数
 53         #图片下载地址：链接: https://pan.baidu.com/s/1Rp2-G_8PdvFfDIoIesMNEg 提取码: ag8w
 54         self.new_action.setIcon(QIcon('images/f1.ico'))  # 给动作设置图标
 55         self.new_action.setShortcut('Ctrl+N')  #给动作设置快捷键
 56         self.new_action.setToolTip('创建新文件')  #设置气泡提示【鼠标在工具栏按钮上时提示的内容】
 57         self.new_action.setStatusTip('Create a new file')#设置在状态栏提示的信息。当鼠标停留在该动作上时，状态栏会显示相应的信息
 58         self.new_action.triggered.connect(self.new_func)  #动作的触发信号
 59         #
 60         #self.open_action.setIcon(QIcon('images/open.ico'))
 61         self.open_action.setShortcut('Ctrl+O')
 62         self.open_action.setToolTip('Open an existing file')
 63         self.open_action.setStatusTip('Open an existing file')
 64         self.open_action.triggered.connect(self.open_file_func)
 65         #
 66         #self.save_action.setIcon(QIcon('images/save.ico'))
 67         self.save_action.setShortcut('Ctrl+S')
 68         self.save_action.setToolTip('Save the file')
 69         self.save_action.setStatusTip('Save the file')
 70         self.save_action.triggered.connect(lambda: self.save_func(self.text_edit.toHtml()))
 71         #
 72         #self.save_as_action.setIcon(QIcon('images/save_as.ico'))
 73         self.save_as_action.setShortcut('Ctrl+A')
 74         self.save_as_action.setToolTip('Save the file to a specified location')
 75         self.save_as_action.setStatusTip('Save the file to a specified location')
 76         self.save_as_action.triggered.connect(lambda: self.save_as_func(self.text_edit.toHtml()))
 77         #
 78         #self.close_action.setIcon(QIcon('images/close.ico'))
 79         self.close_action.setShortcut('Ctrl+E')
 80         self.close_action.setToolTip('Close the window')
 81         self.close_action.setStatusTip('Close the window')
 82         self.close_action.triggered.connect(self.close_func)
 83         #
 84         #self.cut_action.setIcon(QIcon('images/cut.ico'))
 85         self.cut_action.setShortcut('Ctrl+X')
 86         self.cut_action.setToolTip('Cut the text to clipboard')
 87         self.cut_action.setStatusTip('Cut the text')
 88         self.cut_action.triggered.connect(self.cut_func)
 89         #
 90         # self.copy_action.setIcon(QIcon('images/copy.ico'))
 91         self.copy_action.setShortcut('Ctrl+C')
 92         self.copy_action.setToolTip('Copy the text')
 93         self.copy_action.setStatusTip('Copy the text')
 94         self.copy_action.triggered.connect(self.copy_func)
 95         #
 96         # self.paste_action.setIcon(QIcon('images/paste.ico'))
 97         self.paste_action.setShortcut('Ctrl+V')
 98         self.paste_action.setToolTip('Paste the text')
 99         self.paste_action.setStatusTip('Paste the text')
100         self.paste_action.triggered.connect(self.paste_func)
101         #
102         # self.font_action.setIcon(QIcon('images/font.ico'))
103         self.font_action.setShortcut('Ctrl+T')
104         self.font_action.setToolTip('Change the font')
105         self.font_action.setStatusTip('Change the font')
106         self.font_action.triggered.connect(self.font_func)
107         #
108         self.color_action.setIcon(QIcon('images/color.ico'))
109         self.color_action.setShortcut('Ctrl+R')
110         self.color_action.setToolTip('Change the color')
111         self.color_action.setStatusTip('Change the color')
112         self.color_action.triggered.connect(self.color_func)
113         #
114         # self.about_action.setIcon(QIcon('images/about.ico'))
115         # self.about_action.setShortcut('Ctrl+Q')
116         # self.about_action.setToolTip('What is Qt?')
117         # self.about_action.setStatusTip('What is Qt?')
118         # self.about_action.triggered.connect(self.about_func)
119 
120     def text_edit_int(self):
121         self.text_edit.textChanged.connect(self.text_changed_func)
122 
123     def text_changed_func(self):
124         if self.text_edit.toPlainText():
125             self.is_saved = False
126         else:
127             self.is_saved = True
128 
129     def font_func(self):
130         font, ok = QFontDialog.getFont()
131         if ok:
132             self.text_edit.setFont(font)
133 
134     def color_func(self):
135         color = QColorDialog.getColor()
136         if color.isValid():
137             self.text_edit.setTextColor(color)
138 
139     def paste_func(self):
140         self.text_edit.insertHtml(self.clipboard.mimeData().html())
141 
142     def copy_func(self):
143         self.mime_data.setHtml(self.text_edit.textCursor().selection().toHtml())
144         self.clipboard.setMimeData(self.mime_data)
145 
146     def cut_func(self):
147         self.mime_data.setHtml(self.text_edit.textCursor().selection().toHtml())
148         self.clipboard.setMimeData(self.mime_data)
149         self.text_edit.textCursor().removeSelectedText()
150 
151     def close_func(self):
152         if not self.is_saved:
153             choice = QMessageBox.question(self, 'Save File', 'Do you want to save the text?',
154                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
155             if choice == QMessageBox.Yes:
156                 self.save_func(self.text_edit.toHtml())
157                 self.close()
158             elif choice == QMessageBox.No:
159                 self.close()
160             else:
161                 pass
162 
163     def closeEvent(self, QCloseEvent):
164         if not self.is_saved:
165             choice = QMessageBox.question(self, 'Save File', 'Do you want to save the text?',
166                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
167             if choice == QMessageBox.Yes:
168                 self.save_func(self.text_edit.toHtml())
169                 QCloseEvent.accept()
170             elif choice == QMessageBox.No:
171                 QCloseEvent.accept()
172             else:
173                 QCloseEvent.ignore()
174 
175     def save_as_func(self, text):
176         self.path, _ = QFileDialog.getSaveFileName(self, 'Save File', './', 'Files (*.html *.txt *.log)')
177         if self.path:
178             with open(self.path, 'w') as f:
179                 f.write(text)
180             self.is_saved = True
181             self.is_saved_first = False
182 
183     def open_file_func(self):
184         if not self.is_saved:
185             choice = QMessageBox.question(self, '', 'Do you want to save the text?',
186                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
187             if choice == QMessageBox.Yes:
188                 self.save_func()
189                 file, _ = QFileDialog.getOpenFileName(self, 'Open File', './', 'Files (*.html *.txt *.log)')
190                 if file:
191                     with open(file, 'r') as f:
192                         self.text_edit.clear()
193                         self.text_edit.setText(f.read())
194                         self.is_saved = True
195             elif choice == QMessageBox.No:
196                 file, _ = QFileDialog.getOpenFileName(self, 'Open File', './', 'Files (*.html *.txt *.log)')
197                 if file:
198                     with open(file, 'r') as f:
199                         self.text_edit.clear()
200                         self.text_edit.setText(f.read())
201                         self.is_saved = True
202             else:
203                 pass
204         else:
205             file, _ = QFileDialog.getOpenFileName(self, 'Open File', './', 'Files (*.html *.txt *.log)')
206             if file:
207                 with open(file, 'r') as f:
208                     self.text_edit.clear()
209                     self.text_edit.setText(f.read())
210                     self.is_saved = True
211 
212     def new_func(self):
213         if not self.is_saved:
214             choice = QMessageBox.question(self, '', 'Do you want to save the text?',
215                                           QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
216             if choice == QMessageBox.Yes:
217                 self.save_func()
218                 self.text_edit.clear()
219             elif choice == QMessageBox.No:
220                 self.text_edit.clear()
221             else:
222                 pass
223         else:
224             self.text_edit.clear()
225 
226     def save_func(self, text):
227         if self.is_saved_first:
228             self.save_as_func(text)
229         else:
230             with open(self.path, 'w') as f:
231                 f.write(text)
232             self.is_saved = True
233 
234     def save_as_func(self, text):
235         self.path, _ = QFileDialog.getSaveFileName(self, 'Save File', './', 'Files (*.html *.txt *.log)')
236         if self.path:
237             with open(self.path, 'w') as f:
238                 f.write(text)
239             self.is_saved = True
240             self.is_saved_first = False
241 
242     def status_bar_init(self):
243         self.status_bar.showMessage('Ready to compose') #设置状态栏显示的内容
244 
245     def toolbar_init(self):
246         self.file_toolbar.addAction(self.new_action)  #给工具栏添加按钮动作
247         #注意：菜单栏、工具栏相同动作是同一个QAction对象
248         self.file_toolbar.addAction(self.open_action)
249         self.file_toolbar.addAction(self.save_action)
250         self.file_toolbar.addAction(self.save_as_action)
251 
252         self.edit_toolbar.addAction(self.cut_action)
253         self.edit_toolbar.addAction(self.copy_action)
254         self.edit_toolbar.addAction(self.paste_action)
255         self.edit_toolbar.addAction(self.font_action)
256         self.edit_toolbar.addAction(self.color_action)
257 
258     def save_func(self, text):
259         if self.is_saved_first:
260             self.save_as_func(text)
261         else:
262             with open(self.path, 'w') as f:
263                 f.write(text)
264             self.is_saved = True
265 
266     def menu_init(self):
267         self.file_menu.addAction(self.new_action) #给菜单添加一个动作
268         self.file_menu.addAction(self.open_action)
269         self.file_menu.addAction(self.save_action)
270         self.file_menu.addAction(self.save_as_action)
271         self.file_menu.addSeparator()    #加一个分割条
272         self.file_menu.addAction(self.close_action)
273 
274         self.edit_menu.addAction(self.cut_action)
275         self.edit_menu.addAction(self.copy_action)
276         self.edit_menu.addAction(self.paste_action)
277         self.edit_menu.addSeparator()
278         self.edit_menu.addAction(self.font_action)
279         self.edit_menu.addAction(self.color_action)
280 
281         self.help_menu.addAction(self.about_action)
282 
283 
284 if __name__ == '__main__':
285     app = QApplication(sys.argv)
286     splash = QSplashScreen()   #实例化启动画面对象
287     splash.setPixmap(QPixmap('images/splash.jpg'))  #设置启动画面的图片
288     splash.show()  #显示启动画面
289     splash.showMessage('欢迎使用PYQT5',
290                        Qt.AlignBottom | Qt.AlignCenter, Qt.white)
291     #设置在启动画面上要显示的文字
292     #参数1：要显示的文本
293     #参数2：显示的位置。Qt.AlignBottom(垂直方向的位置)  底部；Qt.AlignCenter(水平方向的位置) 居中
294     #参数3：文字的颜色
295     time.sleep(2)
296 
297     demo = Demo()
298     demo.show()
299     splash.finish(demo)#把显示画面切换到主窗口
300     sys.exit(app.exec_())

self.statusbar.addWidget(self.labviewcorrd) #给状态栏添加控件

天子骄龙

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原文地址：https://www.cnblogs.com/liming19680104/p/10388331.html