问题描述
我有定义样式表的 QLineEdit:
QLineEdit {
font: 10pt "MS Shell Dlg 2";
border-radius: 10px;
border: 2px solid rgb(55,55,55);
color: rgb(255,255,255);
padding-left: 20px;
padding-right: 20px;
background-color: rgb(70,70,70);
}
QLineEdit:hover {
border: 2px solid rgb(85,85,85);
}
QLineEdit:focus{
border: 2px solid rgb(85,170,255);
}
QLineEdit:invalid{
border: 2px solid rgb(255,115,107);
}
当我将鼠标悬停或聚焦在该 QLineEdit 上时,它会根据样式表中定义的颜色更改边框。
我如何发出信号或者我应该将什么状态应用到 QLineEdit 以激活 invalid
伪元素并更改 QLineEdit:invalid
块中定义的边框?
我知道我可以像这样设置样式表,但我想避免这种解决方案并使用 invalid
伪元素
QLineEdit{
border: 2px solid rgb(255,107);
border-radius: 10px;
color: rgb(255,70);
}
解决方法
一种可能的解决方案是使用动态属性作为选择器:
import sys
from PySide2.QtWidgets import QApplication,QLineEdit
class LineEdit(QLineEdit):
QSS = """
QLineEdit {
font: 10pt "MS Shell Dlg 2";
border-radius: 10px;
border: 2px solid rgb(55,55,55);
color: rgb(255,255,255);
padding-left: 20px;
padding-right: 20px;
background-color: rgb(70,70,70);
}
QLineEdit:hover {
border: 2px solid rgb(85,85,85);
}
QLineEdit:focus{
border: 2px solid rgb(85,170,255);
}
QLineEdit[invalid="true"]{
border: 2px solid rgb(255,115,107);
}"""
def __init__(self,parent=None):
super().__init__(parent)
self.textChanged.connect(self._handle_textChanged)
self.setProperty("invalid",False)
self.setStyleSheet(self.QSS)
self._handle_textChanged()
def _handle_textChanged(self):
self.setProperty("invalid",not self.isValid())
self.style().polish(self)
def isValid(self):
return len(self.text()) % 2 == 0
def main():
app = QApplication(sys.argv)
w = LineEdit()
w.show()
sys.exit(app.exec_())
if __name__ == "__main__":
main()