如何使用 Signal 控制 QProgressBar [英] How to control QProgressBar with Signal

问题描述

按下按钮开始 100 轮循环.使用 QLabel.setText() 我们从 clicked() 函数的范围内更新 self.label .

Pushing the button starts 100 rounds cycle. With QLabel.setText() we update self.label from inside of scope of clicked() function.

除了更新self.label，我们还想更新progressbar.但是由于 progressbar 是一个局部变量，我们无法从 onClick() 函数内部更新它.

Aside from updating self.label we would like to update the progressbar as well. But since progressbar is a local variable we can't update it from inside of onClick() function.

import time

class ProgressBar(QtGui.QProgressBar):
    def __init__(self, parent=None, total=20):
        super(ProgressBar, self).__init__(parent=parent)

        self.setMinimum(1)
        self.setMaximum(105)        
        self.setTextVisible(True) 

    def set_to_value(self, value):
        self.setValue(value)
        QtGui.qApp.processEvents()

    def closeEvent(self, event):
        self._active=False


class Dialog(QtGui.QDialog):
    def __init__(self):
        super(QtGui.QDialog,self).__init__()

        layout = QtGui.QVBoxLayout()
        self.setLayout(layout)
        self.label = QtGui.QLabel('idle...')
        layout.addWidget(self.label)

        progressbar = ProgressBar(self)
        layout.addWidget(progressbar) 

        button = QtGui.QPushButton('Process')
        button.clicked.connect(self.onClick)
        layout.addWidget(button) 

    def onClick(self):
        for i in range(101):
            message = '...processing %s of 100'%i
            self.label.setText(message)
            QtGui.qApp.processEvents()
            time.sleep(1)


if __name__ == '__main__':
    app = QtGui.QApplication([])
    dialog = Dialog()
    dialog.resize(300, 100)
    dialog.show()
    app.exec_()

推荐答案

声明进度条为:

self.progressbar = ProgressBar(self)

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