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# Copyright (C) 2024 Suchinton Chakravarty
#
# SPDX-License-Identifier: Apache-2.0
import sys
from PyQt6.QtGui import QColor, QPainter, QPainterPath, QBrush
from PyQt6.QtCore import pyqtProperty, QPropertyAnimation, QPoint, QEasingCurve
from PyQt6.QtWidgets import QApplication, QCheckBox
class AnimatedToggle(QCheckBox):
"""
A custom toggle switch widget with animation effects.
Inherits QCheckBox class from PyQt6.QtWidgets module.
"""
bg_color = pyqtProperty(
QColor, lambda self: self._bg_color,
lambda self, col: setattr(self, '_bg_color', col))
circle_color = pyqtProperty(
QColor, lambda self: self._circle_color,
lambda self, col: setattr(self, '_circle_color', col))
active_color = pyqtProperty(
QColor, lambda self: self._active_color,
lambda self, col: setattr(self, '_active_color', col))
disabled_color = pyqtProperty(
QColor, lambda self: self._disabled_color,
lambda self, col: setattr(self, '_disabled_color', col))
circle_pos = pyqtProperty(
float, lambda self: self._circle_pos,
lambda self, pos: (setattr(self, '_circle_pos', pos), self.update()))
intermediate_bg_color = pyqtProperty(
QColor, lambda self: self._intermediate_bg_color,
lambda self, col: setattr(self, '_intermediate_bg_color', col))
def __init__(self, parent=None):
"""
Constructs an AnimatedToggle object.
Parameters
----------
parent : QWidget, optional
The parent widget of the toggle switch (default is None).
"""
super().__init__(parent)
self._bg_color = QColor("#965D62")
self._circle_color = QColor("#DDD")
self._active_color = QColor('#4BD7D6')
self._disabled_color = QColor('#965D62')
self._circle_pos = None
self._intermediate_bg_color = None
self._animation_duration = 500 # milliseconds
self._user_checked = False
self.setFixedHeight(28)
self.stateChanged.connect(self.start_transition)
def setDuration(self, duration: int):
"""
Sets the duration of the animation.
Parameters
----------
duration : int
The duration of the animation in milliseconds.
"""
self._animation_duration = duration
def update_pos_color(self, checked=None):
self._circle_pos = self.height() * (1.1 if checked else 0.1)
if self.isChecked():
self._intermediate_bg_color = self._active_color
else:
self._intermediate_bg_color = self._bg_color
def start_transition(self, state):
if not self._user_checked:
self.update_pos_color(state)
return
for anim in [self.create_animation, self.create_bg_color_animation]:
animation = anim(state)
animation.start()
self._user_checked = False
def mousePressEvent(self, event):
self._user_checked = True
super().mousePressEvent(event)
def create_animation(self, state):
return self._create_common_animation(state, b'circle_pos', self.height() * 0.1, self.height() * 1.1)
def create_bg_color_animation(self, state):
return self._create_common_animation(state, b'intermediate_bg_color', self._bg_color, self._active_color)
def _create_common_animation(self, state, prop, start_val, end_val):
animation = QPropertyAnimation(self, prop, self)
animation.setEasingCurve(QEasingCurve.Type.OutBounce)
animation.setDuration(self._animation_duration)
animation.setStartValue(start_val if state else end_val)
animation.setEndValue(end_val if state else start_val)
return animation
def showEvent(self, event):
super().showEvent(event)
self.update_pos_color(self.isChecked())
def resizeEvent(self, event):
self.update_pos_color(self.isChecked())
def sizeHint(self):
size = super().sizeHint()
size.setWidth(self.height() * 2)
return size
def hitButton(self, pos: QPoint):
return self.contentsRect().contains(pos)
def paintEvent(self, event):
"""
Handles the paint event of the toggle switch.
Parameters
----------
event : QPaintEvent
The paint event.
"""
painter = QPainter(self)
painter.setRenderHint(QPainter.RenderHint.Antialiasing)
circle_color = QColor(
self.disabled_color if not self.isEnabled() else self.circle_color)
bg_color = QColor(self.disabled_color if not self.isEnabled() else self.intermediate_bg_color) \
if self.intermediate_bg_color is not None else QColor("transparent")
border_radius = self.height() / 2
toggle_width = self.height() * 2
toggle_margin = self.height() * 0.3
circle_size = self.height() * 0.8
if self.circle_pos is None:
self.update_pos_color(self.isChecked())
bg_path = QPainterPath()
bg_path.addRoundedRect(
0, 0, toggle_width, self.height(), border_radius, border_radius)
painter.fillPath(bg_path, QBrush(bg_color))
circle = QPainterPath()
circle.addEllipse(self.circle_pos, self.height()
* 0.1, circle_size, circle_size)
painter.fillPath(circle, QBrush(circle_color))
self.setStyleSheet(f"background-color: {bg_color.name()};")
painter.end()
if __name__ == "__main__":
app = QApplication(sys.argv)
window = AnimatedToggle()
window.show()
sys.exit(app.exec())
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