pyqt example BottomLineProgress (snippet)

Python pyqt (gui) example 'BottomLineProgress'

Modules used in program:

• import sys

BottomLineProgress

Python pyqt example: BottomLineProgress

#!/usr/bin/env python
# -*- coding: utf-8 -*-

'''
Created on 2018年2月1日
@author: Irony."[讽刺]
@site: https://pyqt5.com , https://github.com/892768447
@email: [email protected]
@file: PushButtonLine
@description: 
'''
from random import randint
import sys

from PyQt5.QtCore import QTimer, QThread, pyqtSignal
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtWidgets import QPushButton, QApplication, QWidget, QVBoxLayout


__Author__ = "By: Irony.\"[讽刺]\nQQ: 892768447\nEmail: [email protected]"
__Copyright__ = "Copyright (c) 2018 Irony.\"[讽刺]"
__Version__ = "Version 1.0"

StyleSheet = '''
PushButtonLine {
    color: white;
    border: none;
    min-height: 48px;
    background-color: #90caf9;
}
'''


class LoadingThread(QThread):

    valueChanged = pyqtSignal(float)  # 当前值/最大值

    def __init__(self, *args, **kwargs):
        super(LoadingThread, self).__init__(*args, **kwargs)
        self.totalValue = randint(100, 200)  # 模拟最大

    def run(self):
        for i in range(self.totalValue + 1):
            self.valueChanged.emit(i / self.totalValue)
            QThread.msleep(randint(50, 100))


class PushButtonLine(QPushButton):

    lineColor = QColor(0, 150, 136)

    def __init__(self, *args, **kwargs):
        self._waitText = kwargs.pop("waitText", "等待中")
        super(PushButtonLine, self).__init__(*args, **kwargs)
        self._text = self.text()
        self._percent = 0
        self._timer = QTimer(self, timeout=self.update)
        self.clicked.connect(self.start)

    def paintEvent(self, event):
        super(PushButtonLine, self).paintEvent(event)
        if not self._timer.isActive():
            return
        # 画进度
        painter = QPainter(self)
        pen = QPen(self.lineColor)
        pen.setWidth(4)
        painter.setPen(pen)
        painter.drawLine(0, self.height(), self.width()
                         * self._percent, self.height())

    def start(self):
        if hasattr(self, "loadingThread"):
            return self.stop()
        self.loadingThread = LoadingThread(self)
        self.loadingThread.valueChanged.connect(self.setPercent)
        self._timer.start(100)  # 100ms
        self.loadingThread.start()
        self.setText(self._waitText)

    def stop(self):
        self.loadingThread.valueChanged.disconnect(self.setPercent)
        self.loadingThread.terminate()
        self.loadingThread.deleteLater()
        QThread.msleep(100)  # 延迟等待deleteLater执行完毕
        del self.loadingThread
        self._percent = 0
        self._timer.stop()
        self.setText(self._text)

    def setPercent(self, v):
        self._percent = v
        if v == 1:
            self.stop()
            self.update()

    def setLineColor(self, color):
        self.lineColor = QColor(color)
        return self


class Window(QWidget):

    def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        layout = QVBoxLayout(self)
        layout.addWidget(PushButtonLine("点击加载"))
        layout.addWidget(PushButtonLine("点击加载").setLineColor("#ef5350"))
        layout.addWidget(PushButtonLine("点击加载").setLineColor("#ffc107"))


if __name__ == "__main__":
    app = QApplication(sys.argv)
    app.setStyleSheet(StyleSheet)
    w = Window()
    w.show()
    sys.exit(app.exec_())

Useful links

• Learn PyQt: https://pythonbasics.org/pyqt-hello-world/
• Install PyQt: https://pythonbasics.org/install-pyqt/