0508QScrollBar_.scrollbar.customslidermoved.connect-优快云博客

本文链接：https://blog.youkuaiyun.com/royzdr/article/details/88534497

本文介绍了一个使用PyQt5的QScrollBar控件来实时调整RGB颜色的应用实例。通过三个滑块分别控制红、绿、蓝三色的值，用户可以直观地看到颜色的变化效果。

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import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *

class demoQScrollBar(QWidget):
    def __init__(self):
        super(demoQScrollBar, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("0508QScrollBar")
        self.resize(300, 600)

        self.lbl = QLabel("拖动滑块改变颜色")
        self.lbl.setFont(QFont("Arial", 20))

        self.s1 = QScrollBar()
        self.s1.setRange(0, 255)
        self.s1.sliderMoved.connect(self.sliderValue)

        self.s2 = QScrollBar()
        self.s2.setRange(0, 255)
        self.s2.sliderMoved.connect(self.sliderValue)

        self.s3 = QScrollBar()
        self.s3.setRange(0, 255)
        self.s3.sliderMoved.connect(self.sliderValue)

        layout = QHBoxLayout()
        layout.addWidget(self.lbl)
        layout.addWidget(self.s1)
        layout.addWidget(self.s2)
        layout.addWidget(self.s3)

        self.setLayout(layout)

    def sliderValue(self):
        a = self.s1.value()
        b = self.s2.value()
        c = self.s3.value()

        print(a, b, c)
        palette = QPalette()
        color = QColor(a, b, c, 255)
        palette.setColor(QPalette.Foreground, color)
        self.lbl.setPalette(palette)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = demoQScrollBar()
    win.show()
    sys.exit(app.exec_())