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。我该怎么办？我尝试将QColor子类化为没有太大成功，因为该行仍然是黑色的。这是我试过的：

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

你在尝试什么，恕我直言是不可能的。由于您已经对QMainWindow进行了细分，为什么不覆盖setStyleSheet，并解析样式表，并相应地设置颜色？

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()

使用样式表更改线条的颜色

1 个答案: