82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Created on 2021/4/9
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@author: Irony
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@site: https://github.com/PyQt5
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@email: 892768447@qq.com
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@file: LfSlider
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@description: 降低值变化频率
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"""
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from datetime import datetime
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from PyQt5.QtCore import pyqtSignal, QTimer, Qt
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from PyQt5.QtWidgets import QSlider, QWidget, QVBoxLayout, QPlainTextEdit, QHBoxLayout, QGroupBox
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class LfSlider(QSlider):
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valueChanged = pyqtSignal(int)
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def __init__(self, *args, **kwargs):
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delay = kwargs.pop('delay', 500)
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super(LfSlider, self).__init__(*args, **kwargs)
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self.lastValue = self.value()
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self.uTimer = QTimer(self)
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self.uTimer.timeout.connect(self.onValueChanged)
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self.uTimer.start(delay)
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def onValueChanged(self):
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if self.lastValue != self.value():
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self.lastValue = self.value()
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self.valueChanged.emit(self.lastValue)
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class TestWindow(QWidget):
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def __init__(self, *args, **kwargs):
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super(TestWindow, self).__init__(*args, **kwargs)
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layout = QHBoxLayout(self)
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# 左侧原始
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left_group = QGroupBox('原始QSlider', self)
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left_layout = QVBoxLayout(left_group)
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self.leftLabel = QPlainTextEdit(self)
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left_layout.addWidget(self.leftLabel)
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self.leftSlider = QSlider(Qt.Horizontal, self)
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self.leftSlider.valueChanged.connect(self.onLeftChanged)
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left_layout.addWidget(self.leftSlider)
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layout.addWidget(left_group)
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# 右侧低频率变化
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right_group = QGroupBox('LfSlider', self)
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right_layout = QVBoxLayout(right_group)
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self.rightLabel = QPlainTextEdit(self)
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right_layout.addWidget(self.rightLabel)
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self.rightSlider = LfSlider(Qt.Horizontal, self)
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self.rightSlider.valueChanged.connect(self.onRightChanged)
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right_layout.addWidget(self.rightSlider)
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layout.addWidget(right_group)
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def onLeftChanged(self, value):
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self.leftLabel.appendPlainText(datetime.now().strftime("[%H:%M:%S.%f] ") + str(value))
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def onRightChanged(self, value):
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self.rightLabel.appendPlainText(datetime.now().strftime("[%H:%M:%S.%f] ") + str(value))
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if __name__ == '__main__':
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import sys
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import cgitb
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cgitb.enable(format='text')
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from PyQt5.QtWidgets import QApplication
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app = QApplication(sys.argv)
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w = TestWindow()
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w.show()
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sys.exit(app.exec_())
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