如何在pyqt5 python中的qtextedit中突出显示文本中的单词？

Question

我正在使用 pyqt5 python 创建一个文本编辑器。我想像任何其他文本/代码编辑器一样添加查找功能。在查找行编辑中输入一个或多个单词后；该单词将在文本编辑中突出显示！如何在 pyqt5 python 中做到这一点 [而不是在 pyqt4 或任何其他编程语言中] 我的代码：

class Ui_nms_pad(QMainWindow):
    def __init__(self):
        super(Ui_nms_pad, self).__init__() 
        uic.loadUi('Nms_pad.ui', self)
        self.Find_Button.clicked.connect(self.Find_word())
    def Find_word(self):
        words = self.Find_lineEdit.text
        {highlight words in text edit}

Answer 1

我希望下面的代码能够满足您的目的。

    def Find_word(self):
        self.findDialog = QtWidgets.QDialog(self)

        label = QtWidgets.QLabel("Find Word:")
        self.lineEdit = QtWidgets.QLineEdit()
        self.lineEdit.setText(self.lastSearchText)
        label.setBuddy(self.lineEdit)

        self.findButton = QtWidgets.QPushButton("Find Next")
        self.findButton.setDefault(True)
        self.findButton.clicked.connect(self.searchText)

        buttonBox = QtWidgets.QDialogButtonBox(QtCore.Qt.Vertical)
        buttonBox.addButton(self.findButton, QtWidgets.QDialogButtonBox.ActionRole)

        topLeftLayout = QtWidgets.QHBoxLayout()
        topLeftLayout.addWidget(label)
        topLeftLayout.addWidget(self.lineEdit)

        leftLayout = QtWidgets.QVBoxLayout()
        leftLayout.addLayout(topLeftLayout)

        mainLayout = QtWidgets.QGridLayout()
        mainLayout.setSizeConstraint(QtWidgets.QLayout.SetFixedSize)
        mainLayout.addLayout(leftLayout, 0, 0)
        mainLayout.addWidget(buttonBox, 0, 1)
        mainLayout.setRowStretch(2, 1)
        self.findDialog.setLayout(mainLayout)

        self.findDialog.setWindowTitle("Find")
        self.findDialog.show()

    def searchText(self):
        cursor = self.text.textCursor()
        findIndex = cursor.anchor()
        text = self.lineEdit.text()
        content = self.text.toPlainText()
        length = len(text)

        self.lastSearchText = text
        index = content.find(text, findIndex)

        if -1 == index:
            errorDialog = QtWidgets.QMessageBox(self)
            errorDialog.addButton("Cancel", QtWidgets.QMessageBox.ActionRole)

            errorDialog.setWindowTitle("Find")
            errorDialog.setText("Not Found\"%s\"." % text)
            errorDialog.setIcon(QtWidgets.QMessageBox.Critical)
            errorDialog.exec_()
        else:
            start = index

            cursor = self.text.textCursor()
            cursor.clearSelection()
            cursor.movePosition(QtGui.QTextCursor.Start, QtGui.QTextCursor.MoveAnchor)
            cursor.movePosition(QtGui.QTextCursor.Right, QtGui.QTextCursor.MoveAnchor, start + length)
            cursor.movePosition(QtGui.QTextCursor.Left, QtGui.QTextCursor.KeepAnchor, length)
            cursor.selectedText()
            self.text.setTextCursor(cursor)

Answer 2

QTextEdit 具有

find()

功能，可自动突出显示文本匹配的第一次出现，并在找到文本时返回布尔值。
除了搜索字符串之外，如果没有任何参数，搜索将从当前文本光标位置开始直到文档末尾。在以下示例中，如果未找到匹配项，则通过将光标移动到文档的开头来“换行”搜索；这显然仅用于演示目的（如果这是首选搜索模式，您可以在开始搜索之前首先移动光标）。

    def find_word(self):
        words = self.find_lineEdit.text()
        if not self.textEdit.find(words):
            # no match found, move the cursor to the beginning of the
            # document and start the search once again
            cursor = self.textEdit.textCursor()
            cursor.setPosition(0)
            self.textEdit.setTextCursor(cursor)
            self.textEdit.find(words)

Answer 3

from PyQt5.QtWidgets import QMainWindow, QTextEdit, QWidget, QLineEdit, QVBoxLayout, QApplication
from PyQt5.QtGui import QTextCharFormat, QBrush
from PyQt5.QtCore import Qt
import sys

class MainWindow(QMainWindow):

    def __init__(self, parent=None):
        super().__init__(parent)

        self.extraSelections = []
        self.lineEdit = QLineEdit(placeholderText="search")
        self.textEdit = QTextEdit("""Lorem Ipsum is simply dummy text of the printing
                                                        and typesetting industry.
                                                        Lorem Ipsum has been the industry's standard
                                                        dummy text ever since the 1500s, when an
                                                        unknown printer took a galley of type and
                                                        scrambled it to make a type specimen book.
                                                        It has survived not only five centuries,
                                                        but also the leap into electronic typesetting,
                                                        remaining essentially unchanged.
                                                        It was popularised in the 1960s with the release of
                                                        Letraset sheets containing Lorem Ipsum passages,
                                                        and more recently with desktop publishing software
                                                        like Aldus PageMaker including versions of Lorem Ipsum.""")
        
        w = QWidget()
        v  = QVBoxLayout()
        v.addWidget(self.lineEdit)
        v.addWidget(self.textEdit)
        w.setLayout(v)
        self.setCentralWidget(w)

        self.lineEdit.returnPressed.connect(self.find_word)

    def appendExtraSelection(self, tc):
        
            ex = QTextEdit.ExtraSelection()            
            ex.cursor = tc
            ex.format.setForeground(QBrush(Qt.blue))
            ex.format.setBackground(QBrush(Qt.yellow))
            self.extraSelections.append(ex)
 
            
    def find_word(self):
        
        self.extraSelections.clear()    
        doc = self.textEdit.document()
        self.find_recursion(0)
        self.textEdit.setExtraSelections(self.extraSelections)
            
    def find_recursion(self, pos):

        doc = self.textEdit.document()
        tc = doc.find(self.lineEdit.text(), pos)
        if not tc.isNull():
            self.appendExtraSelection(tc)
            self.find_recursion(tc.selectionEnd())


     
    
        
def main():

    app = QApplication([])
    w = MainWindow()
    w.show()
    sys.exit(app.exec())

if __name__ == "__main__":
    main()

1. 使用

   QTextDocument

   的查找功能。
2. 设置QTextEdit.ExtraSelection以突出显示文本。
3. 使用find函数作为递归来搜索所有目标文本。