Question

我创建了一个带有QSlider的Qt表单，如下所示。

    self.np_label = QLabel("Number of Processors")
    self.np_slider = QSlider(Qt.Horizontal)
    self.np_slider.setFocusPolicy(Qt.NoFocus)
    self.np_slider.setMinimum(0)
    self.np_slider.setMaximum(10)
    self.np_slider.setTickInterval(2)
    self.np_slider.setTickPosition(QSlider.TicksBelow)

但是我无法设置刻度标签。有直接的方法吗？

Answer 1

尝试一下：

import sys
from PyQt5.QtWidgets import (QWidget, QSlider, QApplication, 
                             QHBoxLayout, QVBoxLayout)
from PyQt5.QtCore    import QObject, Qt, pyqtSignal
from PyQt5.QtGui     import QPainter, QFont, QColor, QPen


class Communicate(QObject):
    updateBW = pyqtSignal(int)


class BurningWidget(QWidget):
    def __init__(self):      
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setMinimumSize(170, 30)
        self.value = 2 
        self.num   = [2, 4, 6, 8]  

    def setValue(self, value):
        self.value = value

    def paintEvent(self, e):
        qp = QPainter()
        qp.begin(self)
        self.drawWidget(qp)
        qp.end()

    def drawWidget(self, qp):
        MAX_CAPACITY  = 8  
        OVER_CAPACITY = 10
        font = QFont('Serif', 7, QFont.Light)  
        qp.setFont(font)
        size = self.size()
        w    = size.width()
        h    = size.height()
        step = int(round(w / 5)) 
        till = int(((w / OVER_CAPACITY) * self.value))
        full = int(((w / OVER_CAPACITY) * MAX_CAPACITY))

        if self.value >= MAX_CAPACITY:
            qp.setPen(QColor(255, 255, 255))
            qp.setBrush(QColor(255, 255, 184))
            qp.drawRect(0, 0, full, h)
            qp.setPen(QColor(255, 175, 175))
            qp.setBrush(QColor(255, 175, 175))
            qp.drawRect(full, 0, till-full, h)
        else:
            qp.setPen(QColor(255, 255, 255))
            qp.setBrush(QColor(255, 255, 184))
            qp.drawRect(0, 0, till, h)

        pen = QPen(QColor(20, 20, 20), 1, Qt.SolidLine)
        qp.setPen(pen)
        qp.setBrush(Qt.NoBrush)
        qp.drawRect(0, 0, w-1, h-1)     
        j = 0

        for i in range(step, 5*step, step):
            qp.drawLine(i, 0, i, 5)                     
            metrics = qp.fontMetrics()
            fw = metrics.width(str(self.num[j]))
            qp.drawText(i-fw/2, h/2, str(self.num[j]))  
            j = j + 1


class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):      
        OVER_CAPACITY = 10 
        sld = QSlider(Qt.Horizontal, self)
        sld.setFocusPolicy(Qt.NoFocus)
        sld.setRange(0, OVER_CAPACITY) 
        sld.setValue(2)             

        self.c   = Communicate()        
        self.wid = BurningWidget()

        self.c.updateBW[int].connect(self.wid.setValue)
        sld.valueChanged[int].connect(self.changeValue)

        hbox = QHBoxLayout()
        hbox.addWidget(self.wid)
        vbox = QVBoxLayout()
        vbox.addStretch(1)
        vbox.addWidget(sld)

        vbox.addLayout(hbox)
        self.setLayout(vbox)

        self.setGeometry(500, 300, 390, 210)
        self.setWindowTitle('Burning widget')

    def changeValue(self, value):
        self.c.updateBW.emit(value)   
        self.wid.repaint()  

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

带有标签的pyQt5 Qslider

1 个答案: