我想从 a 中获取选定的文本QLineEdit小部件。我们通过单击按钮来获取选定的文本。如果以编程方式选择文本，则它可以工作selectAll。但如果用鼠标选择文本则不起作用。在后一种情况下，显示空字符串。
为什么文本有如此大的差异以及如何让鼠标选择起作用？
#!/usr/bin/python
import sys
from PyQt5.QtWidgets import (QWidget, QLineEdit, QPushButton, QHBoxLayout,
QVBoxLayout, QApplication, QMessageBox)
from PyQt5.QtCore import Qt
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
vbox = QVBoxLayout()
hbox1 = QHBoxLayout()
self.qle = QLineEdit(self)
self.qle.setFocusPolicy(Qt.FocusPolicy.StrongFocus)
self.qle.setText('There are 3 hawks in the sky')
hbox1.addWidget(self.qle)
selAllBtn = QPushButton('Select all', self)
selAllBtn.clicked.connect(self.onSelectAll)
deselBtn = QPushButton('Deselect', self)
deselBtn.clicked.connect(self.onDeSelectAll)
showSelBtn = QPushButton('Show selected', self)
showSelBtn.clicked.connect(self.onShowSelected)
hbox2 = QHBoxLayout()
hbox2.addWidget(selAllBtn)
hbox2.addSpacing(15)
hbox2.addWidget(deselBtn)
hbox2.addSpacing(15)
hbox2.addWidget(showSelBtn)
vbox.addLayout(hbox1)
vbox.addSpacing(20)
vbox.addLayout(hbox2)
self.setLayout(vbox)
self.setWindowTitle('Selected text')
self.show()
def onSelectAll(self):
self.qle.selectAll()
def onDeSelectAll(self):
self.qle.deselect()
def onShowSelected(self):
QMessageBox.information(self, 'info', self.qle.selectedText())
def main():
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
If the 源代码修订为：
void QLineEdit::focusOutEvent(QFocusEvent *e)
{
// ...
Qt::FocusReason reason = e->reason();
if (reason != Qt::ActiveWindowFocusReason &&
reason != Qt::PopupFocusReason)
deselect();
// ...
在按下按钮的情况下，QFocusEvent 的原因是 Qt::MouseFocusReason，因此选择将被删除。
解决方法是在删除选择之前获取所选文本并再次设置：
class LineEdit(QLineEdit):
def focusOutEvent(self, e):
start = self.selectionStart()
length = self.selectionLength()
super().focusOutEvent(e)
self.setSelection(start, length)
self.qle = LineEdit(self)
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