PyQt5，将文本添加到选项卡

Question

我正在用python开发一个IDE，在向标签页添加文本时遇到了一些问题。在

添加标题有效，但在标题内添加文本则不行

这是我的代码：

import sys
import sys
from subprocess import PIPE, Popen
import json
from pyautogui import hotkey
from PyQt5 import QtGui, QtPrintSupport
from PyQt5.QtCore import QRect, QRegExp, Qt
from PyQt5.QtGui import (QColor, QFont, QPainter,
                         QSyntaxHighlighter, QTextCharFormat, QTextCursor)
from PyQt5.QtWidgets import (QAction, QApplication, QDialog, QFileDialog, QPushButton,
                             QHBoxLayout, QInputDialog, QMainWindow,
                             QMessageBox, QPlainTextEdit, QVBoxLayout, QWidget, QTabWidget,
                             qApp, QMenuBar, QStatusBar)

lineBarColor = QColor(53, 53, 53)
lineHighlightColor = QColor('#00FF04')


class NumberBar(QWidget):
    def __init__(self, parent=None):
        super().__init__()
        self.editor = parent
        layout = QVBoxLayout()
        self.setLayout(layout)
        self.editor.blockCountChanged.connect(self.update_width)
        self.editor.updateRequest.connect(self.update_on_scroll)
        self.update_width('1')

    def mousePressEvent(self, QMouseEvent):
        print("class NumberBar(QWidget):mousePressEvent")

    def update_on_scroll(self, rect, scroll):
        if self.isVisible():
            if scroll:
                self.scroll(0, scroll)
            else:
                self.update()

    def update_width(self, string):
        width = self.fontMetrics().width(str(string)) + 10
        print("update_width:width:" + str(width))
        if self.width() != width:
            self.setFixedWidth(width)

    def paintEvent(self, event):
        if self.isVisible():
            block = self.editor.firstVisibleBlock()
            height = self.fontMetrics().height()
            number = block.blockNumber()
            painter = QPainter(self)
            painter.fillRect(event.rect(), lineBarColor)
            painter.drawRect(0, 0, event.rect().width() - 1, event.rect().height() - 1)
            font = painter.font()

            current_block = self.editor.textCursor().block().blockNumber() + 1

            while block.isValid():
                block_geometry = self.editor.blockBoundingGeometry(block)
                offset = self.editor.contentOffset()
                block_top = block_geometry.translated(offset).top()
                number += 1

                rect = QRect(0, block_top, self.width() - 5, height)

                if number == current_block:
                    font.setBold(True)
                else:
                    font.setBold(False)

                painter.setFont(font)
                painter.drawText(rect, Qt.AlignRight, '%i' % number)

                if block_top > event.rect().bottom():
                    break

                block = block.next()

            painter.end()


class Content(QWidget):
    def __init__(self, text):
        super(Content, self).__init__()
        self.editor = QPlainTextEdit()
        # Create a layout for the line numbers

        self.hbox = QHBoxLayout()
        self.setLayout(self.hbox)
        self.numbers = NumberBar(self.editor)
        self.hbox.addWidget(self.numbers)
        self.hbox.addWidget(self.editor)


class MyTableWidget(QWidget):

    def __init__(self, parent):
        super(QWidget, self).__init__(parent)
        self.layout = QVBoxLayout(self)
        self.editor = QPlainTextEdit()
        # Initialize tab screen
        self.tabs = QTabWidget()
        self.tabs.resize(300, 200)

        # Add tabs
        self.tabs.setTabsClosable(True)
        self.tabs.tabCloseRequested.connect(self.closeTab)

        # Add tabs to widget
        self.layout.addWidget(self.tabs)
        self.setLayout(self.layout)

    def closeTab(self, index):
        tab = self.tabs.widget(index)
        tab.deleteLater()
        self.tabs.removeTab(index)

    def addtab(self, content, fileName):
        self.tabs.addTab(Content(str(content)), str(fileName))


class Main(QMainWindow):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        self.open()

        self.tabs = MyTableWidget(self)
        #self.tabs.addtab("nga", "sa")

        self.setCentralWidget(self.tabs)
        self.initUI()
        self.show()

    def initUI(self):
        self.statusBar()
        menu = self.menuBar()
        fileMenu = menu.addMenu('File')
        fileMenu.addAction(self.openAct)

        self.resize(800, 600)

    def closeTab(self, index):
        tab = self.tabs.widget(index)
        tab.deleteLater()
        self.tabs.removeTab(index)

    def buttonClicked(self):
        self.tabs.addTab(Content("smalltext2"), "sadsad")

    def open(self):
        self.openAct = QAction('Open...', self)
        self.openAct.setShortcut('Ctrl+O')
        self.openAct.setStatusTip('Open a file')
        self.is_opened = False
        self.openAct.triggered.connect(self.openFile)

    def openFile(self):
        options = QFileDialog.Options()
        self.files, _ = QFileDialog.getOpenFileNames(
            self, 'Open a file', '',
            'All Files (*);;Python Files (*.py);;Text Files (*.txt)',
            options=options
        )

        self.files = self.files[0]
        if self.files:
            with open(self.files, 'r+') as file_o:
                print(self.files)
                text = file_o.read()
                text_widget = QPlainTextEdit(self.tabs)
                text_widget.setPlainText(text)
                self.tabs.addtab(text_widget, self.files[0])
                print(text)


if __name__ == '__main__':
    with open("../config.json", "r") as jsonFile:
        read = jsonFile.read()
        data = json.loads(read)
        app = QApplication(sys.argv)
        app.setStyle('Fusion')
        palette = QtGui.QPalette()
        palette.setColor(QtGui.QPalette.Window, QColor(data["editor"][0]["windowColor"]))
        palette.setColor(QtGui.QPalette.WindowText, QColor(data["editor"][0]["windowText"]))
        palette.setColor(QtGui.QPalette.Base, QColor(data["editor"][0]["editorColor"]))
        palette.setColor(QtGui.QPalette.AlternateBase, QColor(data["editor"][0]["alternateBase"]))
        palette.setColor(QtGui.QPalette.ToolTipBase, QColor(data["editor"][0]["ToolTipBase"]))
        palette.setColor(QtGui.QPalette.ToolTipText, QColor(data["editor"][0]["ToolTipText"]))
        palette.setColor(QtGui.QPalette.Text, QColor(data["editor"][0]["editorText"]))
        palette.setColor(QtGui.QPalette.Button, QColor(data["editor"][0]["buttonColor"]))
        palette.setColor(QtGui.QPalette.ButtonText, QColor(data["editor"][0]["buttonTextColor"]))
        palette.setColor(QtGui.QPalette.Highlight, QColor(data["editor"][0]["HighlightColor"]).lighter())
        palette.setColor(QtGui.QPalette.HighlightedText, QColor(data["editor"][0]["HighlightedTextColor"]))
        app.setPalette(palette)
        ex = Main()
        sys.exit(app.exec_())

在第171行，我尝试添加一个选项卡，其中包含我打开的文件的内容self.tabs.addtab(text_widget, self.files[0])。在

它确实创建了一个名为self.files[0]的选项卡，但内容不在其中。在

Answer 1

问题其实很简单，您正在不必要地创建许多QPlainTextEdit，例如，openFile()方法中有一个QPlainTextEdit，该方法传递给方法addtab()，但是如果您检查方法addtab()MyTableWidget需要一个字符串，而不是{}，那么{}中还有另一个{}。在

排除不必要的元素，我们得到以下结果：

import sys

from PyQt5.QtCore import Qt, QRect
from PyQt5.QtGui import QColor, QPainter
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow, QAction, \
    QVBoxLayout, QTabWidget, QFileDialog, QPlainTextEdit, QHBoxLayout


lineBarColor = QColor(53, 53, 53)
lineHighlightColor = QColor('#00FF04')


class NumberBar(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.editor = parent
        layout = QVBoxLayout(self)
        self.editor.blockCountChanged.connect(self.update_width)
        self.editor.updateRequest.connect(self.update_on_scroll)
        self.update_width('1')

    def mousePressEvent(self, QMouseEvent):
        print("class NumberBar(QWidget):mousePressEvent")

    def update_on_scroll(self, rect, scroll):
        if self.isVisible():
            if scroll:
                self.scroll(0, scroll)
            else:
                self.update()

    def update_width(self, string):
        width = self.fontMetrics().width(str(string)) + 10
        print("update_width:width:" + str(width))
        if self.width() != width:
            self.setFixedWidth(width)

    def paintEvent(self, event):
        if self.isVisible():
            block = self.editor.firstVisibleBlock()
            height = self.fontMetrics().height()
            number = block.blockNumber()
            painter = QPainter(self)
            painter.fillRect(event.rect(), lineBarColor)
            painter.drawRect(0, 0, event.rect().width() - 1, event.rect().height() - 1)
            font = painter.font()

            current_block = self.editor.textCursor().block().blockNumber() + 1

            while block.isValid():
                block_geometry = self.editor.blockBoundingGeometry(block)
                offset = self.editor.contentOffset()
                block_top = block_geometry.translated(offset).top()
                number += 1

                rect = QRect(0, block_top, self.width() - 5, height)

                if number == current_block:
                    font.setBold(True)
                else:
                    font.setBold(False)

                painter.setFont(font)
                painter.drawText(rect, Qt.AlignRight, '%i' % number)

                if block_top > event.rect().bottom():
                    break

                block = block.next()

            painter.end()


class Content(QWidget):
    def __init__(self, text):
        super(Content, self).__init__()
        self.editor = QPlainTextEdit()
        self.editor.setPlainText(text)
        # Create a layout for the line numbers

        self.hbox = QHBoxLayout(self)
        self.numbers = NumberBar(self.editor)
        self.hbox.addWidget(self.numbers)
        self.hbox.addWidget(self.editor)


class MyTableWidget(QWidget):

    def __init__(self, parent=None):
        super(QWidget, self).__init__(parent)
        self.layout = QVBoxLayout(self)
        # Initialize tab screen
        self.tabs = QTabWidget()
        self.tabs.resize(300, 200)

        # Add tabs
        self.tabs.setTabsClosable(True)
        self.tabs.tabCloseRequested.connect(self.closeTab)

        # Add tabs to widget
        self.layout.addWidget(self.tabs)
        self.setLayout(self.layout)

    def closeTab(self, index):
        tab = self.tabs.widget(index)
        tab.deleteLater()
        self.tabs.removeTab(index)

    def addtab(self, content, fileName):
        self.tabs.addTab(Content(str(content)), str(fileName))


class Main(QMainWindow):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        self.open()

        self.tabs = MyTableWidget()
        #self.tabs.addtab("nga", "sa")

        self.setCentralWidget(self.tabs)
        self.initUI()
        self.show()

    def initUI(self):
        self.statusBar()
        menu = self.menuBar()
        fileMenu = menu.addMenu('File')
        fileMenu.addAction(self.openAct)

        self.resize(800, 600)

    def closeTab(self, index):
        tab = self.tabs.widget(index)
        tab.deleteLater()
        self.tabs.removeTab(index)

    def buttonClicked(self):
        self.tabs.addTab(Content("smalltext2"), "sadsad")

    def open(self):
        self.openAct = QAction('Open...', self)
        self.openAct.setShortcut('Ctrl+O')
        self.openAct.setStatusTip('Open a file')
        self.is_opened = False
        self.openAct.triggered.connect(self.openFile)

    def openFile(self):
        options = QFileDialog.Options()
        filenames, _ = QFileDialog.getOpenFileNames(
            self, 'Open a file', '',
            'All Files (*);;Python Files (*.py);;Text Files (*.txt)',
            options=options
        )
        if filenames:
            for filename in filenames:
                with open(filename, 'r+') as file_o:
                    text = file_o.read()
                    self.tabs.addtab(text, filename)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Main()
    sys.exit(app.exec_())