LfSlider

Author: 892768447

Diff for: QSlider/LfSlider.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2021/4/9
+@author: Irony
+@site: https://github.com/PyQt5
+@email: [email protected]
+@file: LfSlider
+@description: 降低值变化频率
+"""
+from datetime import datetime
+
+from PyQt5.QtCore import pyqtSignal, QTimer, Qt
+from PyQt5.QtWidgets import QSlider, QWidget, QVBoxLayout, QPlainTextEdit, QHBoxLayout, QGroupBox
+
+
+class LfSlider(QSlider):
+    valueChanged = pyqtSignal(int)
+
+    def __init__(self, *args, **kwargs):
+        delay = kwargs.pop('delay', 500)
+        super(LfSlider, self).__init__(*args, **kwargs)
+        self.lastValue = self.value()
+        self.uTimer = QTimer(self)
+        self.uTimer.timeout.connect(self.onValueChanged)
+        self.uTimer.start(delay)
+
+    def onValueChanged(self):
+        if self.lastValue != self.value():
+            self.lastValue = self.value()
+            self.valueChanged.emit(self.lastValue)
+
+
+class TestWindow(QWidget):
+
+    def __init__(self, *args, **kwargs):
+        super(TestWindow, self).__init__(*args, **kwargs)
+        layout = QHBoxLayout(self)
+
+        # 左侧原始
+        left_group = QGroupBox('原始QSlider', self)
+        left_layout = QVBoxLayout(left_group)
+        self.leftLabel = QPlainTextEdit(self)
+        left_layout.addWidget(self.leftLabel)
+
+        self.leftSlider = QSlider(Qt.Horizontal, self)
+        self.leftSlider.valueChanged.connect(self.onLeftChanged)
+        left_layout.addWidget(self.leftSlider)
+
+        layout.addWidget(left_group)
+
+        # 右侧低频率变化
+        right_group = QGroupBox('LfSlider', self)
+        right_layout = QVBoxLayout(right_group)
+        self.rightLabel = QPlainTextEdit(self)
+        right_layout.addWidget(self.rightLabel)
+
+        self.rightSlider = LfSlider(Qt.Horizontal, self)
+        self.rightSlider.valueChanged.connect(self.onRightChanged)
+        right_layout.addWidget(self.rightSlider)
+
+        layout.addWidget(right_group)
+
+    def onLeftChanged(self, value):
+        self.leftLabel.appendPlainText(datetime.now().strftime("[%H:%M:%S.%f]   ") + str(value))
+
+    def onRightChanged(self, value):
+        self.rightLabel.appendPlainText(datetime.now().strftime("[%H:%M:%S.%f]   ") + str(value))
+
+
+if __name__ == '__main__':
+    import sys
+    import cgitb
+
+    cgitb.enable(format='text')
+    from PyQt5.QtWidgets import QApplication
+
+    app = QApplication(sys.argv)
+    w = TestWindow()
+    w.show()
+    sys.exit(app.exec_())

Diff for: QSlider/README.md

@@ -3,6 +3,7 @@
 - 目录
   - [滑动条点击定位](#1滑动条点击定位)
   - [双层圆环样式](#2双层圆环样式)
+  - [低频率值变化](#3低频率值变化)
 
 ## 1、滑动条点击定位
 [运行 ClickJumpSlider.py](ClickJumpSlider.py)
@@ -43,4 +44,11 @@ def mousePressEvent(self, event):
 [运行 QssQSlider.py](QssQSlider.py) | [运行 PaintQSlider.py](PaintQSlider.py)
 
 ![QssQSlider](ScreenShot/QssQSlider.gif)
-![PaintQSlider](ScreenShot/PaintQSlider.gif)
+![PaintQSlider](ScreenShot/PaintQSlider.gif)
+
+## 3、低频率值变化
+[运行 LfSlider.py](LfSlider.py) 
+
+覆盖了`valueChanged`信号，通过使用定时器来延迟发送值变化，如果无法覆盖信号则可以自定义一个新的信号
+
+![LfSlider](ScreenShot/LfSlider.gif)

Diff for: QSlider/ScreenShot/LfSlider.gif

@@ -100,6 +100,7 @@ https://pyqt.site 论坛是专门针对PyQt5学习和提升开设的网站，分
   - [QSlider](QSlider)
     - [滑动条点击定位](QSlider/ClickJumpSlider.py)
     - [双层圆环样式](QSlider/QssQSlider.py)
+    - [低频率值变化](QSlider/LfSlider.py)
 
 - Display Widgets
   - [QLabel](QLabel)