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Python: pyqt5 自己写一个窗口文本编辑器_python pyqt5 富文本编辑器

作者：秋刀鱼在做梦 | 2024-07-13 00:25:19

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python pyqt5 富文本编辑器

PyQt5是Digia的一套Qt5应用框架与python的结合，同时支持2.x和3.x。Qt库由Riverbank Computing开发，是最强大的GUI库之一。

>>> 今天，我们将尝试用pyqt5写一个文本编辑器。

效果如图：

 支持以下功能：复制、剪切、粘帖、保存、全选、读取、撤回、前进、加粗、斜体、下划线、字体、字号、左中右对齐、打印。

>>> Tips：完整代码在本页最后~

一、安装模块

使用pip安装pyqt5：

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pyqt5

二、导入模块

导入所需模块：

  1. from PyQt5.QtGui import *
  2. from PyQt5.QtWidgets import *
  3. from PyQt5.QtCore import *
  4. from PyQt5.QtPrintSupport import *
  5.  
  6. import os
  7. import sys
  8. import uuid
'
运行

三、初始化定义

首先，我们先初始化定义一些后文所需函数。这里如果有看不懂，看到后文就可以理解了。

  1. FONT_SIZES = [7, 8, 9, 10, 11, 12, 13, 14, 18, 24, 36, 48, 64, 72, 96, 144, 288]
  2. IMAGE_EXTENSIONS = ['.jpg','.png','.bmp']
  3. HTML_EXTENSIONS = ['.htm', '.html']
  4.  
  5. def hexuuid():
  6.     return uuid.uuid4().hex
  7.  
  8. def splitext(p):
  9.     return os.path.splitext(p)[1].lower()
  10.  
  11. class TextEdit(QTextEdit):
  12.     def canInsertFromMimeData(self, source):
  13.         if source.hasImage():
  14.             return True
  15.         else:
  16.             return super(TextEdit, self).canInsertFromMimeData(source)
  17.  
  18.     def insertFromMimeData(self, source):
  19.         cursor = self.textCursor()
  20.         document = self.document()
  21.  
  22.         if source.hasUrls():
  23.             for u in source.urls():
  24.                 file_ext = splitext(str(u.toLocalFile()))
  25.                 if u.isLocalFile() and file_ext in IMAGE_EXTENSIONS:
  26.                     image = QImage(u.toLocalFile())
  27.                     document.addResource(QTextDocument.ImageResource, u, image)
  28.                     cursor.insertImage(u.toLocalFile())
  29.                 else:
  30.                     break
  31.             else:
  32.                 return
  33.  
  34.         elif source.hasImage():
  35.             image = source.imageData()
  36.             uuid = hexuuid()
  37.             document.addResource(QTextDocument.ImageResource, uuid, image)
  38.             cursor.insertImage(uuid)
  39.             return
  40.  
  41.         super(TextEdit, self).insertFromMimeData(source)

四、设置主窗口

开始使用pyqt5，建立一个主窗口，添加按钮等元素位置。

  1. class MainWindow(QMainWindow):
  2.     def __init__(self, *args, **kwargs):
  3.         super(MainWindow, self).__init__(*args, **kwargs)
  4.  
  5.         layout = QVBoxLayout()
  6.         self.editor = TextEdit()
  7.         self.editor.setAutoFormatting(QTextEdit.AutoAll)
  8.         self.editor.selectionChanged.connect(self.update_format)
  9.         
  10.         font = QFont('Times', 12)
  11.         self.editor.setFont(font)
  12.         self.editor.setFontPointSize(12)
  13.         self.path = None
  14.         layout.addWidget(self.editor)
  15.  
  16.         container = QWidget()
  17.         container.setLayout(layout)
  18.         self.setCentralWidget(container)
  19.         self.status = QStatusBar()
  20.         self.setStatusBar(self.status)
  21.  
  22.         file_toolbar = QToolBar("文件")
  23.         file_toolbar.setIconSize(QSize(14, 14))
  24.         self.addToolBar(file_toolbar)
  25.         file_menu = self.menuBar().addMenu("&文件")
  26.  
  27.         open_file_action = QAction(QIcon(os.path.join('images', 'blue-folder-open-document.png')), "打开文件", self)
  28.         open_file_action.setStatusTip("从本地磁盘中读取文件..")
  29.         open_file_action.triggered.connect(self.file_open)
  30.         file_menu.addAction(open_file_action)
  31.         file_toolbar.addAction(open_file_action)
  32.  
  33.         save_file_action = QAction(QIcon(os.path.join('images', 'disk.png')), "保存", self)
  34.         save_file_action.setStatusTip("保存到本地磁盘..")
  35.         save_file_action.triggered.connect(self.file_save)
  36.         file_menu.addAction(save_file_action)
  37.         file_toolbar.addAction(save_file_action)
  38.  
  39.         saveas_file_action = QAction(QIcon(os.path.join('images', 'disk--pencil.png')), "另存为", self)
  40.         saveas_file_action.setStatusTip("另存为文件..")
  41.         saveas_file_action.triggered.connect(self.file_saveas)
  42.         file_menu.addAction(saveas_file_action)
  43.         file_toolbar.addAction(saveas_file_action)
  44.  
  45.         print_action = QAction(QIcon(os.path.join('images', 'printer.png')), "打印", self)
  46.         print_action.setStatusTip("打印本页..")
  47.         print_action.triggered.connect(self.file_print)
  48.         file_menu.addAction(print_action)
  49.         file_toolbar.addAction(print_action)
  50.  
  51.         edit_toolbar = QToolBar("编辑")
  52.         edit_toolbar.setIconSize(QSize(16, 16))
  53.         self.addToolBar(edit_toolbar)
  54.         edit_menu = self.menuBar().addMenu("&编辑")
  55.  
  56.         undo_action = QAction(QIcon(os.path.join('images', 'arrow-curve-180-left.png')), "撤回", self)
  57.         undo_action.setStatusTip("撤回上一个操作..")
  58.         undo_action.triggered.connect(self.editor.undo)
  59.         edit_menu.addAction(undo_action)
  60.  
  61.         redo_action = QAction(QIcon(os.path.join('images', 'arrow-curve.png')), "重做", self)
  62.         redo_action.setStatusTip("重做撤回的操作..")
  63.         redo_action.triggered.connect(self.editor.redo)
  64.         edit_toolbar.addAction(redo_action)
  65.         edit_menu.addAction(redo_action)
  66.  
  67.         edit_menu.addSeparator()
  68.  
  69.         cut_action = QAction(QIcon(os.path.join('images', 'scissors.png')), "剪切", self)
  70.         cut_action.setStatusTip("剪切选定内容..")
  71.         cut_action.setShortcut(QKeySequence.Cut)
  72.         cut_action.triggered.connect(self.editor.cut)
  73.         edit_toolbar.addAction(cut_action)
  74.         edit_menu.addAction(cut_action)
  75.  
  76.         copy_action = QAction(QIcon(os.path.join('images', 'document-copy.png')), "复制", self)
  77.         copy_action.setStatusTip("复制选定内容..")
  78.         cut_action.setShortcut(QKeySequence.Copy)
  79.         copy_action.triggered.connect(self.editor.copy)
  80.         edit_toolbar.addAction(copy_action)
  81.         edit_menu.addAction(copy_action)
  82.  
  83.         paste_action = QAction(QIcon(os.path.join('images', 'clipboard-paste-document-text.png')), "粘帖", self)
  84.         paste_action.setStatusTip("从剪贴板粘帖..")
  85.         cut_action.setShortcut(QKeySequence.Paste)
  86.         paste_action.triggered.connect(self.editor.paste)
  87.         edit_toolbar.addAction(paste_action)
  88.         edit_menu.addAction(paste_action)
  89.  
  90.         select_action = QAction(QIcon(os.path.join('images', 'selection-input.png')), "全选", self)
  91.         select_action.setStatusTip("全选所有文字..")
  92.         cut_action.setShortcut(QKeySequence.SelectAll)
  93.         select_action.triggered.connect(self.editor.selectAll)
  94.         edit_menu.addAction(select_action)
  95.  
  96.         edit_menu.addSeparator()
  97.  
  98.         wrap_action = QAction(QIcon(os.path.join('images', 'arrow-continue.png')), "自动换行", self)
  99.         wrap_action.setStatusTip("当文字长度超过边框大小时自动换行..")
  100.         wrap_action.setCheckable(True)
  101.         wrap_action.setChecked(True)
  102.         wrap_action.triggered.connect(self.edit_toggle_wrap)
  103.         edit_menu.addAction(wrap_action)
  104.  
  105.         format_toolbar = QToolBar("格式")
  106.         format_toolbar.setIconSize(QSize(16, 16))
  107.         self.addToolBar(format_toolbar)
  108.         format_menu = self.menuBar().addMenu("&格式")
  109.  
  110.         self.fonts = QFontComboBox()
  111.         self.fonts.currentFontChanged.connect(self.editor.setCurrentFont)
  112.         format_toolbar.addWidget(self.fonts)
  113.  
  114.         self.fontsize = QComboBox()
  115.         self.fontsize.addItems([str(s) for s in FONT_SIZES])
  116.         self.fontsize.currentIndexChanged[str].connect(lambda s: self.editor.setFontPointSize(float(s)) )
  117.         format_toolbar.addWidget(self.fontsize)
  118.  
  119.         self.bold_action = QAction(QIcon(os.path.join('images', 'edit-bold.png')), "加粗", self)
  120.         self.bold_action.setStatusTip("加粗选定内容..")
  121.         self.bold_action.setShortcut(QKeySequence.Bold)
  122.         self.bold_action.setCheckable(True)
  123.         self.bold_action.toggled.connect(lambda x: self.editor.setFontWeight(QFont.Bold if x else QFont.Normal))
  124.         format_toolbar.addAction(self.bold_action)
  125.         format_menu.addAction(self.bold_action)
  126.  
  127.         self.italic_action = QAction(QIcon(os.path.join('images', 'edit-italic.png')), "斜体", self)
  128.         self.italic_action.setStatusTip("将选定内容设为斜体..")
  129.         self.italic_action.setShortcut(QKeySequence.Italic)
  130.         self.italic_action.setCheckable(True)
  131.         self.italic_action.toggled.connect(self.editor.setFontItalic)
  132.         format_toolbar.addAction(self.italic_action)
  133.         format_menu.addAction(self.italic_action)
  134.  
  135.         self.underline_action = QAction(QIcon(os.path.join('images', 'edit-underline.png')), "下划线", self)
  136.         self.underline_action.setStatusTip("将选定内容加下划线..")
  137.         self.underline_action.setShortcut(QKeySequence.Underline)
  138.         self.underline_action.setCheckable(True)
  139.         self.underline_action.toggled.connect(self.editor.setFontUnderline)
  140.         format_toolbar.addAction(self.underline_action)
  141.         format_menu.addAction(self.underline_action)
  142.  
  143.         format_menu.addSeparator()
  144.  
  145.         self.alignl_action = QAction(QIcon(os.path.join('images', 'edit-alignment.png')), "靠左对齐", self)
  146.         self.alignl_action.setStatusTip("将文本靠左对齐..")
  147.         self.alignl_action.setCheckable(True)
  148.         self.alignl_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignLeft))
  149.         format_toolbar.addAction(self.alignl_action)
  150.         format_menu.addAction(self.alignl_action)
  151.  
  152.         self.alignc_action = QAction(QIcon(os.path.join('images', 'edit-alignment-center.png')), "居中对齐", self)
  153.         self.alignc_action.setStatusTip("将文本居中对齐..")
  154.         self.alignc_action.setCheckable(True)
  155.         self.alignc_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignCenter))
  156.         format_toolbar.addAction(self.alignc_action)
  157.         format_menu.addAction(self.alignc_action)
  158.  
  159.         self.alignr_action = QAction(QIcon(os.path.join('images', 'edit-alignment-right.png')), "靠右对齐", self)
  160.         self.alignr_action.setStatusTip("将文本靠右对齐..")
  161.         self.alignr_action.setCheckable(True)
  162.         self.alignr_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignRight))
  163.         format_toolbar.addAction(self.alignr_action)
  164.         format_menu.addAction(self.alignr_action)
  165.  
  166.         self.alignj_action = QAction(QIcon(os.path.join('images', 'edit-alignment-justify.png')), "对齐", self)
  167.         self.alignj_action.setStatusTip("分散对齐文本..")
  168.         self.alignj_action.setCheckable(True)
  169.         self.alignj_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignJustify))
  170.         format_toolbar.addAction(self.alignj_action)
  171.         format_menu.addAction(self.alignj_action)
  172.  
  173.         format_group = QActionGroup(self)
  174.         format_group.setExclusive(True)
  175.         format_group.addAction(self.alignl_action)
  176.         format_group.addAction(self.alignc_action)
  177.         format_group.addAction(self.alignr_action)
  178.         format_group.addAction(self.alignj_action)
  179.  
  180.         format_menu.addSeparator()
  181.  
  182.         self._format_actions = [
  183.             self.fonts,
  184.             self.fontsize,
  185.             self.bold_action,
  186.             self.italic_action,
  187.             self.underline_action]
  188.         self.update_format()
  189.         self.update_title()
  190.         self.show()

五、定义功能

也是在window的class里，我们定义保存等等的功能

  1.     def block_signals(self, objects, b):
  2.         for o in objects:
  3.             o.blockSignals(b)
  4.  
  5.     def update_format(self):
  6.         self.block_signals(self._format_actions, True)
  7.         self.fonts.setCurrentFont(self.editor.currentFont())
  8.         self.fontsize.setCurrentText(str(int(self.editor.fontPointSize())))
  9.         self.italic_action.setChecked(self.editor.fontItalic())
  10.         self.underline_action.setChecked(self.editor.fontUnderline())
  11.         self.bold_action.setChecked(self.editor.fontWeight() == QFont.Bold)
  12.         self.alignl_action.setChecked(self.editor.alignment() == Qt.AlignLeft)
  13.         self.alignc_action.setChecked(self.editor.alignment() == Qt.AlignCenter)
  14.         self.alignr_action.setChecked(self.editor.alignment() == Qt.AlignRight)
  15.         self.alignj_action.setChecked(self.editor.alignment() == Qt.AlignJustify)
  16.         self.block_signals(self._format_actions, False)
  17.  
  18.     def dialog_critical(self, s):
  19.         dlg = QMessageBox(self)
  20.         dlg.setText(s)
  21.         dlg.setIcon(QMessageBox.Critical)
  22.         dlg.show()
  23.  
  24.     def file_open(self):
  25.         path, _ = QFileDialog.getOpenFileName(self, "Open file", "", "HTML documents (*.html);Text documents (*.txt);All files (*.*)")
  26.         try:
  27.             with open(path, 'rU') as f:
  28.                 text = f.read()
  29.         except Exception as e:
  30.             self.dialog_critical(str(e))
  31.         else:
  32.             self.path = path
  33.             self.editor.setText(text)
  34.             self.update_title()
  35.  
  36.     def file_save(self):
  37.         if self.path is None:
  38.             return self.file_saveas()
  39.         text = self.editor.toHtml() if splitext(self.path) in HTML_EXTENSIONS else self.editor.toPlainText()
  40.         try:
  41.             with open(self.path, 'w') as f:
  42.                 f.write(text)
  43.         except Exception as e:
  44.             self.dialog_critical(str(e))
  45.  
  46.     def file_saveas(self):
  47.         path, _ = QFileDialog.getSaveFileName(self, "Save file", "", "HTML documents (*.html);Text documents (*.txt);All files (*.*)")
  48.         if not path:
  49.             return
  50.         text = self.editor.toHtml() if splitext(path) in HTML_EXTENSIONS else self.editor.toPlainText()
  51.         try:
  52.             with open(path, 'w') as f:
  53.                 f.write(text)
  54.         except Exception as e:
  55.             self.dialog_critical(str(e))
  56.         else:
  57.             self.path = path
  58.             self.update_title()
  59.  
  60.     def file_print(self):
  61.         dlg = QPrintDialog()
  62.         if dlg.exec_():
  63.             self.editor.print_(dlg.printer())
  64.  
  65.     def update_title(self):
  66.         self.setWindowTitle("%s - 轩氏记事本 XuanNotepad" % (os.path.basename(self.path) if self.path else "Untitled"))
  67.  
  68.     def edit_toggle_wrap(self):
  69.         self.editor.setLineWrapMode( 1 if self.editor.lineWrapMode() == 0 else 0 )

六、生成窗口

最后一步，生成窗口（这里的applicationname你可以改掉）：

  1. if __name__ == '__main__':
  2.     app = QApplication(sys.argv)
  3.     app.setApplicationName("轩氏记事本 XuanNotepad")
  4.     window = MainWindow()
  5.     window.resize(1300,750)
  6.     app.exec_()

七、最终效果

运行程序，我们来看一下效果如何！

 

 

完整代码

最后送上完整代码：

  1. from PyQt5.QtGui import *
  2. from PyQt5.QtWidgets import *
  3. from PyQt5.QtCore import *
  4. from PyQt5.QtPrintSupport import *
  5.  
  6. import os
  7. import sys
  8. import uuid
  9.  
  10. FONT_SIZES = [7, 8, 9, 10, 11, 12, 13, 14, 18, 24, 36, 48, 64, 72, 96, 144, 288]
  11. IMAGE_EXTENSIONS = ['.jpg','.png','.bmp']
  12. HTML_EXTENSIONS = ['.htm', '.html']
  13.  
  14. def hexuuid():
  15.     return uuid.uuid4().hex
  16.  
  17. def splitext(p):
  18.     return os.path.splitext(p)[1].lower()
  19.  
  20. class TextEdit(QTextEdit):
  21.     def canInsertFromMimeData(self, source):
  22.         if source.hasImage():
  23.             return True
  24.         else:
  25.             return super(TextEdit, self).canInsertFromMimeData(source)
  26.  
  27.     def insertFromMimeData(self, source):
  28.         cursor = self.textCursor()
  29.         document = self.document()
  30.  
  31.         if source.hasUrls():
  32.             for u in source.urls():
  33.                 file_ext = splitext(str(u.toLocalFile()))
  34.                 if u.isLocalFile() and file_ext in IMAGE_EXTENSIONS:
  35.                     image = QImage(u.toLocalFile())
  36.                     document.addResource(QTextDocument.ImageResource, u, image)
  37.                     cursor.insertImage(u.toLocalFile())
  38.                 else:
  39.                     break
  40.             else:
  41.                 return
  42.  
  43.         elif source.hasImage():
  44.             image = source.imageData()
  45.             uuid = hexuuid()
  46.             document.addResource(QTextDocument.ImageResource, uuid, image)
  47.             cursor.insertImage(uuid)
  48.             return
  49.  
  50.         super(TextEdit, self).insertFromMimeData(source)
  51.  
  52. class MainWindow(QMainWindow):
  53.     def __init__(self, *args, **kwargs):
  54.         super(MainWindow, self).__init__(*args, **kwargs)
  55.  
  56.         layout = QVBoxLayout()
  57.         self.editor = TextEdit()
  58.         self.editor.setAutoFormatting(QTextEdit.AutoAll)
  59.         self.editor.selectionChanged.connect(self.update_format)
  60.         
  61.         font = QFont('Times', 12)
  62.         self.editor.setFont(font)
  63.         self.editor.setFontPointSize(12)
  64.         self.path = None
  65.         layout.addWidget(self.editor)
  66.  
  67.         container = QWidget()
  68.         container.setLayout(layout)
  69.         self.setCentralWidget(container)
  70.         self.status = QStatusBar()
  71.         self.setStatusBar(self.status)
  72.  
  73.         file_toolbar = QToolBar("文件")
  74.         file_toolbar.setIconSize(QSize(14, 14))
  75.         self.addToolBar(file_toolbar)
  76.         file_menu = self.menuBar().addMenu("&文件")
  77.  
  78.         open_file_action = QAction(QIcon(os.path.join('images', 'blue-folder-open-document.png')), "打开文件", self)
  79.         open_file_action.setStatusTip("从本地磁盘中读取文件..")
  80.         open_file_action.triggered.connect(self.file_open)
  81.         file_menu.addAction(open_file_action)
  82.         file_toolbar.addAction(open_file_action)
  83.  
  84.         save_file_action = QAction(QIcon(os.path.join('images', 'disk.png')), "保存", self)
  85.         save_file_action.setStatusTip("保存到本地磁盘..")
  86.         save_file_action.triggered.connect(self.file_save)
  87.         file_menu.addAction(save_file_action)
  88.         file_toolbar.addAction(save_file_action)
  89.  
  90.         saveas_file_action = QAction(QIcon(os.path.join('images', 'disk--pencil.png')), "另存为", self)
  91.         saveas_file_action.setStatusTip("另存为文件..")
  92.         saveas_file_action.triggered.connect(self.file_saveas)
  93.         file_menu.addAction(saveas_file_action)
  94.         file_toolbar.addAction(saveas_file_action)
  95.  
  96.         print_action = QAction(QIcon(os.path.join('images', 'printer.png')), "打印", self)
  97.         print_action.setStatusTip("打印本页..")
  98.         print_action.triggered.connect(self.file_print)
  99.         file_menu.addAction(print_action)
  100.         file_toolbar.addAction(print_action)
  101.  
  102.         edit_toolbar = QToolBar("编辑")
  103.         edit_toolbar.setIconSize(QSize(16, 16))
  104.         self.addToolBar(edit_toolbar)
  105.         edit_menu = self.menuBar().addMenu("&编辑")
  106.  
  107.         undo_action = QAction(QIcon(os.path.join('images', 'arrow-curve-180-left.png')), "撤回", self)
  108.         undo_action.setStatusTip("撤回上一个操作..")
  109.         undo_action.triggered.connect(self.editor.undo)
  110.         edit_menu.addAction(undo_action)
  111.  
  112.         redo_action = QAction(QIcon(os.path.join('images', 'arrow-curve.png')), "重做", self)
  113.         redo_action.setStatusTip("重做撤回的操作..")
  114.         redo_action.triggered.connect(self.editor.redo)
  115.         edit_toolbar.addAction(redo_action)
  116.         edit_menu.addAction(redo_action)
  117.  
  118.         edit_menu.addSeparator()
  119.  
  120.         cut_action = QAction(QIcon(os.path.join('images', 'scissors.png')), "剪切", self)
  121.         cut_action.setStatusTip("剪切选定内容..")
  122.         cut_action.setShortcut(QKeySequence.Cut)
  123.         cut_action.triggered.connect(self.editor.cut)
  124.         edit_toolbar.addAction(cut_action)
  125.         edit_menu.addAction(cut_action)
  126.  
  127.         copy_action = QAction(QIcon(os.path.join('images', 'document-copy.png')), "复制", self)
  128.         copy_action.setStatusTip("复制选定内容..")
  129.         cut_action.setShortcut(QKeySequence.Copy)
  130.         copy_action.triggered.connect(self.editor.copy)
  131.         edit_toolbar.addAction(copy_action)
  132.         edit_menu.addAction(copy_action)
  133.  
  134.         paste_action = QAction(QIcon(os.path.join('images', 'clipboard-paste-document-text.png')), "粘帖", self)
  135.         paste_action.setStatusTip("从剪贴板粘帖..")
  136.         cut_action.setShortcut(QKeySequence.Paste)
  137.         paste_action.triggered.connect(self.editor.paste)
  138.         edit_toolbar.addAction(paste_action)
  139.         edit_menu.addAction(paste_action)
  140.  
  141.         select_action = QAction(QIcon(os.path.join('images', 'selection-input.png')), "全选", self)
  142.         select_action.setStatusTip("全选所有文字..")
  143.         cut_action.setShortcut(QKeySequence.SelectAll)
  144.         select_action.triggered.connect(self.editor.selectAll)
  145.         edit_menu.addAction(select_action)
  146.  
  147.         edit_menu.addSeparator()
  148.  
  149.         wrap_action = QAction(QIcon(os.path.join('images', 'arrow-continue.png')), "自动换行", self)
  150.         wrap_action.setStatusTip("当文字长度超过边框大小时自动换行..")
  151.         wrap_action.setCheckable(True)
  152.         wrap_action.setChecked(True)
  153.         wrap_action.triggered.connect(self.edit_toggle_wrap)
  154.         edit_menu.addAction(wrap_action)
  155.  
  156.         format_toolbar = QToolBar("格式")
  157.         format_toolbar.setIconSize(QSize(16, 16))
  158.         self.addToolBar(format_toolbar)
  159.         format_menu = self.menuBar().addMenu("&格式")
  160.  
  161.         self.fonts = QFontComboBox()
  162.         self.fonts.currentFontChanged.connect(self.editor.setCurrentFont)
  163.         format_toolbar.addWidget(self.fonts)
  164.  
  165.         self.fontsize = QComboBox()
  166.         self.fontsize.addItems([str(s) for s in FONT_SIZES])
  167.         self.fontsize.currentIndexChanged[str].connect(lambda s: self.editor.setFontPointSize(float(s)) )
  168.         format_toolbar.addWidget(self.fontsize)
  169.  
  170.         self.bold_action = QAction(QIcon(os.path.join('images', 'edit-bold.png')), "加粗", self)
  171.         self.bold_action.setStatusTip("加粗选定内容..")
  172.         self.bold_action.setShortcut(QKeySequence.Bold)
  173.         self.bold_action.setCheckable(True)
  174.         self.bold_action.toggled.connect(lambda x: self.editor.setFontWeight(QFont.Bold if x else QFont.Normal))
  175.         format_toolbar.addAction(self.bold_action)
  176.         format_menu.addAction(self.bold_action)
  177.  
  178.         self.italic_action = QAction(QIcon(os.path.join('images', 'edit-italic.png')), "斜体", self)
  179.         self.italic_action.setStatusTip("将选定内容设为斜体..")
  180.         self.italic_action.setShortcut(QKeySequence.Italic)
  181.         self.italic_action.setCheckable(True)
  182.         self.italic_action.toggled.connect(self.editor.setFontItalic)
  183.         format_toolbar.addAction(self.italic_action)
  184.         format_menu.addAction(self.italic_action)
  185.  
  186.         self.underline_action = QAction(QIcon(os.path.join('images', 'edit-underline.png')), "下划线", self)
  187.         self.underline_action.setStatusTip("将选定内容加下划线..")
  188.         self.underline_action.setShortcut(QKeySequence.Underline)
  189.         self.underline_action.setCheckable(True)
  190.         self.underline_action.toggled.connect(self.editor.setFontUnderline)
  191.         format_toolbar.addAction(self.underline_action)
  192.         format_menu.addAction(self.underline_action)
  193.  
  194.         format_menu.addSeparator()
  195.  
  196.         self.alignl_action = QAction(QIcon(os.path.join('images', 'edit-alignment.png')), "靠左对齐", self)
  197.         self.alignl_action.setStatusTip("将文本靠左对齐..")
  198.         self.alignl_action.setCheckable(True)
  199.         self.alignl_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignLeft))
  200.         format_toolbar.addAction(self.alignl_action)
  201.         format_menu.addAction(self.alignl_action)
  202.  
  203.         self.alignc_action = QAction(QIcon(os.path.join('images', 'edit-alignment-center.png')), "居中对齐", self)
  204.         self.alignc_action.setStatusTip("将文本居中对齐..")
  205.         self.alignc_action.setCheckable(True)
  206.         self.alignc_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignCenter))
  207.         format_toolbar.addAction(self.alignc_action)
  208.         format_menu.addAction(self.alignc_action)
  209.  
  210.         self.alignr_action = QAction(QIcon(os.path.join('images', 'edit-alignment-right.png')), "靠右对齐", self)
  211.         self.alignr_action.setStatusTip("将文本靠右对齐..")
  212.         self.alignr_action.setCheckable(True)
  213.         self.alignr_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignRight))
  214.         format_toolbar.addAction(self.alignr_action)
  215.         format_menu.addAction(self.alignr_action)
  216.  
  217.         self.alignj_action = QAction(QIcon(os.path.join('images', 'edit-alignment-justify.png')), "对齐", self)
  218.         self.alignj_action.setStatusTip("分散对齐文本..")
  219.         self.alignj_action.setCheckable(True)
  220.         self.alignj_action.triggered.connect(lambda: self.editor.setAlignment(Qt.AlignJustify))
  221.         format_toolbar.addAction(self.alignj_action)
  222.         format_menu.addAction(self.alignj_action)
  223.  
  224.         format_group = QActionGroup(self)
  225.         format_group.setExclusive(True)
  226.         format_group.addAction(self.alignl_action)
  227.         format_group.addAction(self.alignc_action)
  228.         format_group.addAction(self.alignr_action)
  229.         format_group.addAction(self.alignj_action)
  230.  
  231.         format_menu.addSeparator()
  232.  
  233.         self._format_actions = [
  234.             self.fonts,
  235.             self.fontsize,
  236.             self.bold_action,
  237.             self.italic_action,
  238.             self.underline_action]
  239.         self.update_format()
  240.         self.update_title()
  241.         self.show()
  242.  
  243.     def block_signals(self, objects, b):
  244.         for o in objects:
  245.             o.blockSignals(b)
  246.  
  247.     def update_format(self):
  248.         self.block_signals(self._format_actions, True)
  249.         self.fonts.setCurrentFont(self.editor.currentFont())
  250.         self.fontsize.setCurrentText(str(int(self.editor.fontPointSize())))
  251.         self.italic_action.setChecked(self.editor.fontItalic())
  252.         self.underline_action.setChecked(self.editor.fontUnderline())
  253.         self.bold_action.setChecked(self.editor.fontWeight() == QFont.Bold)
  254.         self.alignl_action.setChecked(self.editor.alignment() == Qt.AlignLeft)
  255.         self.alignc_action.setChecked(self.editor.alignment() == Qt.AlignCenter)
  256.         self.alignr_action.setChecked(self.editor.alignment() == Qt.AlignRight)
  257.         self.alignj_action.setChecked(self.editor.alignment() == Qt.AlignJustify)
  258.         self.block_signals(self._format_actions, False)
  259.  
  260.     def dialog_critical(self, s):
  261.         dlg = QMessageBox(self)
  262.         dlg.setText(s)
  263.         dlg.setIcon(QMessageBox.Critical)
  264.         dlg.show()
  265.  
  266.     def file_open(self):
  267.         path, _ = QFileDialog.getOpenFileName(self, "Open file", "", "HTML documents (*.html);Text documents (*.txt);All files (*.*)")
  268.         try:
  269.             with open(path, 'rU') as f:
  270.                 text = f.read()
  271.         except Exception as e:
  272.             self.dialog_critical(str(e))
  273.         else:
  274.             self.path = path
  275.             self.editor.setText(text)
  276.             self.update_title()
  277.  
  278.     def file_save(self):
  279.         if self.path is None:
  280.             return self.file_saveas()
  281.         text = self.editor.toHtml() if splitext(self.path) in HTML_EXTENSIONS else self.editor.toPlainText()
  282.         try:
  283.             with open(self.path, 'w') as f:
  284.                 f.write(text)
  285.         except Exception as e:
  286.             self.dialog_critical(str(e))
  287.  
  288.     def file_saveas(self):
  289.         path, _ = QFileDialog.getSaveFileName(self, "Save file", "", "HTML documents (*.html);Text documents (*.txt);All files (*.*)")
  290.         if not path:
  291.             return
  292.         text = self.editor.toHtml() if splitext(path) in HTML_EXTENSIONS else self.editor.toPlainText()
  293.         try:
  294.             with open(path, 'w') as f:
  295.                 f.write(text)
  296.         except Exception as e:
  297.             self.dialog_critical(str(e))
  298.         else:
  299.             self.path = path
  300.             self.update_title()
  301.  
  302.     def file_print(self):
  303.         dlg = QPrintDialog()
  304.         if dlg.exec_():
  305.             self.editor.print_(dlg.printer())
  306.  
  307.     def update_title(self):
  308.         self.setWindowTitle("%s - 轩氏记事本 XuanNotepad" % (os.path.basename(self.path) if self.path else "Untitled"))
  309.  
  310.     def edit_toggle_wrap(self):
  311.         self.editor.setLineWrapMode( 1 if self.editor.lineWrapMode() == 0 else 0 )
  312.  
  313. if __name__ == '__main__':
  314.     app = QApplication(sys.argv)
  315.     app.setApplicationName("轩氏记事本 XuanNotepad")
  316.     window = MainWindow()
  317.     window.resize(1300,750)
  318.     app.exec_()

 

>>> 本期pyqt5制作文本编辑器就到这里了，如有问题可以私聊。我们下期不见不散~

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