如果添加了新文本,可以删除前一行,但也必须删除
\r
并验证它不是空文本。此外,对于要接收的文本的对象
tqdm
write()
QPlainTextEdit
. 使用
QMetaObject::invokeMethod()
使其线程安全
import time
import threading
from tqdm import tqdm
from PyQt5 import QtCore, QtGui, QtWidgets
import lorem
class LogTextEdit(QtWidgets.QPlainTextEdit):
def write(self, message):
if not hasattr(self, "flag"):
self.flag = False
message = message.replace('\r', '').rstrip()
if message:
method = "replace_last_line" if self.flag else "appendPlainText"
QtCore.QMetaObject.invokeMethod(self,
method,
QtCore.Qt.QueuedConnection,
QtCore.Q_ARG(str, message))
self.flag = True
else:
self.flag = False
@QtCore.pyqtSlot(str)
def replace_last_line(self, text):
cursor = self.textCursor()
cursor.movePosition(QtGui.QTextCursor.End)
cursor.select(QtGui.QTextCursor.BlockUnderCursor)
cursor.removeSelectedText()
cursor.insertBlock()
self.setTextCursor(cursor)
self.insertPlainText(text)
def foo(w):
for i in tqdm(range(100), file=w):
time.sleep(0.1)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = LogTextEdit(readOnly=True)
w.appendPlainText(lorem.paragraph())
w.appendHtml("Welcome to Stack Overflow")
w.show()
threading.Thread(target=foo, args=(w,), daemon=True).start()
sys.exit(app.exec_())
