pyqt5--mdiArea-QMainWindow-Dialog-多窗口显示

import sys from PyQt5 import QtCore, QtGui, QtWidgets from PyQt5.QtCore import Qt from PyQt5.QtGui import QFont, QIcon from PyQt5.QtWidgets import (QApplication, QMainWindow, QMenuBar, QMenu, QAction, QActionGroup, QToolBar, QStyle, QToolButton, QMdiArea, QMdiSubWindow, QPlainTextEdit, QFileDialog, QMessageBox) class DemoMdi(QMainWindow): def __init__(self, parent=None): super(DemoMdi, self).__init__(parent) # 设置窗口标题 self.setWindowTitle('实战PyQt5: MDI多文档接口程序 演示') # 设置窗口大小 self.resize(480, 360) self.initUi() def initUi(self): self.initMenuBar() self.initToolBar() self.mdiArea = QMdiArea(self) self.setCentralWidget(self.mdiArea) self.newDocIndex = 1 def initMenuBar(self): menuBar = self.menuBar() style = QApplication.style() # ==== 文件 ====# fileMenu = menuBar.addMenu('文件') # 新建一个文档 aFileNew = QAction('新建文档', self) aFileNew.setIcon(style.standardIcon(QStyle.SP_FileIcon)) aFileNew.triggered.connect(self.onFileNew) fileMenu.addAction(aFileNew) # 打开一个文档 aFileOpen = QAction('打开文档', self) aFileOpen.setIcon(style.standardIcon(QStyle.SP_DialogOpenButton)) aFileOpen.triggered.connect(self.onFileOpen) fileMenu.addAction(aFileOpen) # 关闭一个文档 aFileCloseAll = QAction('关闭全部', self) aFileCloseAll.setIcon(style.standardIcon(QStyle.SP_DialogCloseButton)) aFileOpen.triggered.connect(self.onFileCloseAll) fileMenu.addAction(aFileCloseAll) # 添加分割线 fileMenu.addSeparator() # 触发的是动作 aFileExit = QAction('退出', self) aFileExit.triggered.connect(self.close) fileMenu.addAction(aFileExit) # ==== 编辑 ====# editMenu = menuBar.addMenu('编辑') # 剪切 aEditCut = QAction('剪切', self) aEditCut.setIcon(QIcon(':/ico/cut.png')) aEditCut.triggered.connect(self.onEditCut) editMenu.addAction(aEditCut) # 复制 aEditCopy = QAction('复制', self) aEditCopy.setIcon(QIcon(':/ico/copy.png')) aEditCopy.triggered.connect(self.onEditCopy) editMenu.addAction(aEditCopy) # 粘贴 aEditPaste = QAction('粘贴', self) aEditPaste.setIcon(QIcon(':/ico/paste.png')) aEditPaste.triggered.connect(self.onEditPaste) editMenu.addAction(aEditPaste) # ==== 窗口排列方式 ====# windowMenu = menuBar.addMenu('窗口') # 子窗口模式 aWndSubView = QAction('子窗口模式', self) aWndSubView.triggered.connect(lambda: self.onWinowdMode(0)) windowMenu.addAction(aWndSubView) # 标签页模式 aWndTab = QAction('标签页模式', self) aWndTab.triggered.connect(lambda: self.onWinowdMode(1)) windowMenu.addAction(aWndTab) windowMenu.addSeparator() # 平铺模式 aWndTile = QAction('平铺模式', self) aWndTile.triggered.connect(lambda: self.onWinowdMode(2)) windowMenu.addAction(aWndTile) # 窗口级联模式 aWndCascade = QAction('窗口级联模式', self) aWndCascade.triggered.connect(lambda: self.onWinowdMode(3)) windowMenu.addAction(aWndCascade) def initToolBar(self): toolBar = self.addToolBar('') style = QApplication.style() min_width = 64 btnFileNew = QToolButton(self) btnFileNew.setText('新建文档') btnFileNew.setMinimumWidth(min_width) btnFileNew.setIcon(style.standardIcon(QStyle.SP_FileIcon)) btnFileNew.setToolButtonStyle(Qt.ToolButtonTextUnderIcon) btnFileNew.clicked.connect(self.onFileNew) toolBar.addWidget(btnFileNew) btnFileOpen = QToolButton(self) btnFileOpen.setText('打开文档') btnFileOpen.setMinimumWidth(min_width) btnFileOpen.setIcon(style.standardIcon(QStyle.SP_DialogOpenButton)) btnFileOpen.setToolButtonStyle(Qt.ToolButtonTextUnderIcon) btnFileOpen.clicked.connect(self.onFileOpen) toolBar.addWidget(btnFileOpen) btnFileCloseAll = QToolButton(self) btnFileCloseAll.setText('关闭全部') btnFileCloseAll.setMinimumWidth(min_width) btnFileCloseAll.setIcon(style.standardIcon(QStyle.SP_DialogCloseButton)) btnFileCloseAll.setToolButtonStyle(Qt.ToolButtonTextUnderIcon) btnFileCloseAll.clicked.connect(self.onFileCloseAll) toolBar.addWidget(btnFileCloseAll) toolBar.addSeparator() btnEditCut = QToolButton(self) btnEditCut.setText('剪切') btnEditCut.setMinimumWidth(64) btnEditCut.setIcon(QIcon(':/ico/cut.png')) btnEditCut.setToolButtonStyle(Qt.ToolButtonTextUnderIcon) btnEditCut.clicked.connect(self.onEditCut) toolBar.addWidget(btnEditCut) btnEditCopy = QToolButton(self) btnEditCopy.setText('复制') btnEditCopy.setMinimumWidth(64) btnEditCopy.setIcon(QIcon(':/ico/copy.png')) btnEditCopy.setToolButtonStyle(Qt.ToolButtonTextUnderIcon) btnEditCopy.clicked.connect(self.onEditCopy) toolBar.addWidget(btnEditCopy) btnEditPaste = QToolButton(self) btnEditPaste.setText('粘贴') btnEditPaste.setMinimumWidth(64) btnEditPaste.setIcon(QIcon(':/ico/paste.png')) btnEditPaste.setToolButtonStyle(Qt.ToolButtonTextUnderIcon) btnEditPaste.clicked.connect(self.onEditPaste) toolBar.addWidget(btnEditPaste) def msgCritical(self, strInfo): dlg = QMessageBox(self) dlg.setIcon(QMessageBox.Critical) dlg.setText(strInfo) dlg.show() def onFileNew(self): newDoc = QMdiSubWindow(self) newDoc.setWindowTitle('新文档 ' + str(self.newDocIndex)) self.newDocIndex += 1 newDoc.setWidget(QPlainTextEdit(newDoc)) self.mdiArea.addSubWindow(newDoc) newDoc.show() def onFileOpen(self): path, _ = QFileDialog.getOpenFileName(self, '打开文件', '', '文本文件 (*.txt)') if path: try: with open(path, 'rU') as f: text = f.read() except Exception as e: self.msgCritical(str(e)) else: openDoc = QMdiSubWindow(self) openDoc.setWindowTitle(path) txtEdit = QPlainTextEdit(openDoc) txtEdit.setPlainText(text) openDoc.setWidget(txtEdit) self.mdiArea.addSubWindow(openDoc) openDoc.show() def onFileCloseAll(self): self.mdiArea.closeAllSubWindows() def onEditCut(self): txtEdit = self.mdiArea.activeSubWindow().widget() txtEdit.cut() def onEditCopy(self): txtEdit = self.mdiArea.activeSubWindow().widget() txtEdit.copy() def onEditPaste(self): txtEdit = self.mdiArea.activeSubWindow().widget() txtEdit.paste() def onWinowdMode(self, index): if index == 3: self.mdiArea.cascadeSubWindows() elif index == 2: self.mdiArea.tileSubWindows() elif index == 1: self.mdiArea.setViewMode(QMdiArea.TabbedView) else: self.mdiArea.setViewMode(QMdiArea.SubWindowView) if __name__ == '__main__': app = QApplication(sys.argv) window = DemoMdi() window.show() sys.exit