QtGui.QTextEdit set line color baced on what text the line contains

Question

It\'s my first time using stackoverflow to find an answer, to my problems. I\'m using a QtGui.QTextEdit to display text similar to below and would like to change the color o

Answer 1

This can be done quite easily with QSyntaxHighlighter. Here's a simple demo:

from PyQt4 import QtCore, QtGui

sample = """
--[ Begin
this is a test

[ERROR] this test failed.

--[ Command returned exit code 1
"""

class Highlighter(QtGui.QSyntaxHighlighter):
    def __init__(self, parent):
        super(Highlighter, self).__init__(parent)
        self.sectionFormat = QtGui.QTextCharFormat()
        self.sectionFormat.setForeground(QtCore.Qt.blue)
        self.errorFormat = QtGui.QTextCharFormat()
        self.errorFormat.setForeground(QtCore.Qt.red)

    def highlightBlock(self, text):
        # uncomment this line for Python2
        # text = unicode(text)
        if text.startswith('--['):
            self.setFormat(0, len(text), self.sectionFormat)
        elif text.startswith('[ERROR]'):
            self.setFormat(0, len(text), self.errorFormat)

class Window(QtGui.QWidget):
    def __init__(self):
        super(Window, self).__init__()
        self.editor = QtGui.QTextEdit(self)
        self.highlighter = Highlighter(self.editor.document())
        self.editor.setText(sample)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.editor)

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.setGeometry(500, 150, 300, 300)
    window.show()
    sys.exit(app.exec_())