使用样式表更改线条的颜色

Question

我画了一条线，我想设置颜色和线宽。为了使我的应用程序可自定义，我希望在样式表中具有此属性。我该怎么做？我试图对QColor进行子分类，但没有取得多大成功，因为这条线仍然是黑色的。这是我尝试过的：

import sys
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtGui import QPainter, QColor

class Main(QWidget):
    def paintEvent(self, e):
        painter = QPainter()
        painter.begin(self)
        painter.setPen(LineColor())
        painter.drawLine(0, 0, 100, 100)
        painter.end()

class LineColor(QColor):
    ''' Exposes a class, so that its color can be set using the style sheet '''

qss = '''
LineColor {
    color: red;
}
'''

app = QApplication(sys.argv)
app.setStyleSheet(qss)
main = Main()
main.show()
sys.exit(app.exec_())

Answer 1

您正在尝试的，恕我直言是不可能的。既然你已经QMainWindow了，为什么不覆盖setStyleSheet，并解析样式表，并相应地设置颜色呢？

class Main(QWidget):
    def __init__(...) :
        ...
        ...
        ...
        self.myLineColor = QColor( Qt::black )
        ...
        ...
    def setStyleSheet( sheet ) :
        # Your code to parse the stylesheet
        self.myLineColor.setRgb( ... ) # or setNamedColor or similar.
        QMainWindow::setStyleSheet( self, sheet )
    def paintEvent(self, e):
        painter = QPainter()
        painter.begin(self)
        painter.setPen(self.myLineColor)
        painter.drawLine(0, 0, 100, 100)
        painter.end()