简介

呼吸背景效果是一种常见的UI设计元素，它可以使按钮在鼠标悬停时产生渐变颜色的效果，给人一种视觉上的呼吸感，在PyQt中，我们可以通过重写QWidget的paintEvent方法来实现这种效果。

实现步骤

1、导入所需库

2、创建自定义按钮类

3、重写paintEvent方法

4、设置按钮属性

5、测试呼吸背景效果

详细代码

导入所需库
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton
from PyQt5.QtCore import Qt, QTimer, QRect
from PyQt5.QtGui import QPainter, QBrush, QColor
import sys
class BreathingButton(QPushButton):
    def __init__(self, parent=None):
        super(BreathingButton, self).__init__(parent)
        self._timer = QTimer(self)
        self._timer.setInterval(100)
        self._timer.timeout.connect(self.update)
        self._timer.start()
        self._color1 = QColor(255, 0, 0)
        self._color2 = QColor(0, 255, 0)
        self._color3 = QColor(0, 0, 255)
        self._color4 = QColor(255, 255, 255)
        self._current_color = self._color1
        self._brush = QBrush(self._current_color)
        self.setGeometry(100, 100, 200, 60)
        self.setText("点击我")
        self.setStyleSheet("backgroundcolor: transparent;")
        self.show()
    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setBrush(self._brush)
        painter.drawRect(event.rect())
        if self.isEnabled():
            if self.hasFocus():
                if self._current_color == self._color1:
                    self._current_color = self._color2
                else:
                    self._current_color = self._color1
            elif self._current_color == self._color1:
                self._current_color = self._color4
            else:
                self._current_color = self._color3
        painter.setBrush(QBrush(self._current_color))
        painter.drawRect(event.rect())
        painter.end()
        super(BreathingButton, self).paintEvent(event)
if __name__ == "__main__":
    app = QApplication(sys.argv)
    button = BreathingButton()
    sys.exit(app.exec_())

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