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#!/usr/bin/python3
# -*- coding: utf-8 -*-

"""
PyQt5 教程

在这个例子中，我们创建一个自定义控件。

作者：我的世界你曾经来过
博客：http://blog.csdn.net/weiaitaowang
最后编辑：2016年8月7日
"""

import sys
from PyQt5.QtWidgets import (QApplication, QWidget, QSlider,
QHBoxLayout, QVBoxLayout)
from PyQt5.QtCore import Qt, QObject, 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(1, 30)
        self.value = 75
        self.num = [75, 150, 225, 300, 375, 450, 525, 600, 675]

    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):

        font = QFont('Serif', 7, QFont.Light)
        qp.setFont(font)

        size = self.size()
        w = size.width()
        h = size.height()

        step = int(round(w / 10.0))

        till = int(((w / 750.0) * self.value))
        full = int(((w / 750.0) * 700))

        if self.value >= 700:

            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, 10*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):

        sld = QSlider(Qt.Vertical, self)
        sld.setFocusPolicy(Qt.NoFocus)
        sld.setRange(1, 750)
        sld.setValue(75)
        sld.setGeometry(30, 40, 150, 30)

        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.addLayout(hbox)
        self.setLayout(vbox)

        self.setGeometry(300, 300, 390, 210)
        self.setWindowTitle('自定义控件')
        self.show()

    def changeValue(self, value):

        self.c.updateBW.emit(value)
        self.wid.repaint()

if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())