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# Copyright (C) 2016 Damon Lynch <damonlynch@gmail.com>
# This file is part of Rapid Photo Downloader.
#
# Rapid Photo Downloader is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Rapid Photo Downloader is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Rapid Photo Downloader. If not,
# see <http://www.gnu.org/licenses/>.
"""
Toggle Switch reminiscent of Android On/off switches:
https://www.google.com/design/spec/components/selection-controls.html
Visual style is rounded. However by adjusting the style sheet it can be
made like a rounded square, close to how Gnome handles it, albeit
without the "ON"/"OFF text.
Inspiration:
http://stackoverflow.com/questions/14780517/toggle-switch-in-qt
http://thesmithfam.org/blog/2010/03/10/fancy-qslider-stylesheet/
"""
__author__ = 'Damon Lynch'
__copyright__ = "Copyright 2016, Damon Lynch"
from typing import Optional
from PyQt5.QtCore import Qt, pyqtSlot
from PyQt5.QtGui import QPalette, QColor, QFont,QFontMetrics
from PyQt5.QtWidgets import QSlider, QApplication
class QToggleSwitch(QSlider):
"""
Toggle Switch reminiscent of Android On/off switches.
Connect to signal valueChanged to react to user setting the switch.
"""
def __init__(self, background: Optional[QColor]=None, parent=None) -> None:
super().__init__(Qt.Horizontal, parent)
self.base_height = QFontMetrics(QFont()).height() // 2 * 2
self.radius = self.base_height // 2
width = self.base_height * 2
self.widgetWidth = width
self.handleWidth = width // 2
self.sliderRange = width
self.sliderMidPoint = width // 2
self.setRange(0, self.sliderRange)
self.setMaximumWidth(self.widgetWidth)
self.setFixedHeight(self.base_height + 6)
self.setStyleSheet(self.stylesheet(background))
self.actionTriggered.connect(self.onActionTriggered)
self.sliderReleased.connect(self.onSliderRelease)
def stylesheet(self, background: Optional[QColor]) -> str:
shading_intensity = 104
windowColor = (QPalette().color(QPalette().Window)) # type: QColor
if background is None:
backgroundName = windowColor.name()
else:
backgroundName = QColor(background).name()
handleLightName = (QPalette().color(QPalette().Light)).name() # type: QColor
handleDarkName = (QPalette().color(QPalette().Dark)).name() # type: QColor
handleHoverLightName = (QPalette().color(QPalette().Light)).lighter(shading_intensity).name()
handleHoverDarkName = (QPalette().color(QPalette().Dark)).darker(shading_intensity).name()
insetDarkName = windowColor.darker(108).name()
insetLightName = windowColor.darker(102).name()
highlightColor = (QPalette().color(QPalette().Highlight)) # type: QColor
highlightLightName = highlightColor.lighter(110).name()
highlightDarkName = highlightColor.darker(130).name()
return """
QSlider::groove:horizontal {
background-color: %(backgroundName)s;
height: %(height)s px;
}
QSlider::sub-page:horizontal {
background: qlineargradient(x1: 0, y1: 0.2, x2: 1, y2: 1,
stop: 0 %(highlightDarkName)s, stop: 1 %(highlightLightName)s);
border: 1px solid #777;
border-top-left-radius: %(radius)spx;
border-bottom-left-radius: %(radius)spx;
}
QSlider::add-page:horizontal {
background: qlineargradient(x1: 0, y1: 0.2, x2: 1, y2: 1,
stop: 0 %(insetDarkName)s, stop: 1 %(insetLightName)s);
border: 1px solid #777;
border-top-right-radius: %(radius)spx;
border-bottom-right-radius: %(radius)spx;
}
QSlider::handle:horizontal {
background: qlineargradient(x1:0, y1:0, x2:1, y2:1,
stop:0 %(handleLightName)s, stop:1 %(handleDarkName)s);
border: 1px solid #777;
width: %(buttonWidth)s px;
border-radius: %(radius)spx;
}
QSlider::handle:horizontal:hover {
background: qlineargradient(x1:0, y1:0, x2:1, y2:1,
stop:0 %(handleHoverLightName)s, stop:1 %(handleHoverDarkName)s);
border: 1px solid #444;
border-radius: %(radius)spx;
}
QSlider::sub-page:horizontal:disabled {
background: #bbb;
border-color: #999;
}
QSlider::add-page:horizontal:disabled {
background: #eee;
border-color: #999;
}
QSlider::handle:horizontal:disabled {
background: #eee;
border: 1px solid #aaa;
border-radius: %(radius)spx;
}
""" % dict(buttonWidth=self.handleWidth,
handleLightName=handleLightName,
handleDarkName=handleDarkName,
handleHoverLightName=handleHoverLightName,
handleHoverDarkName=handleHoverDarkName,
backgroundName=backgroundName,
highlightDarkName=highlightDarkName,
highlightLightName=highlightLightName,
height=self.base_height,
insetDarkName=insetDarkName,
insetLightName=insetLightName,
radius=self.radius)
@pyqtSlot(int)
def onActionTriggered(self, action: int) -> None:
if action != 7:
if action % 2:
self.setValue(self.sliderRange)
else:
self.setValue(0)
@pyqtSlot()
def onSliderRelease(self) -> None:
if self.sliderPosition() >= self.sliderMidPoint:
self.setValue(self.sliderRange)
else:
self.setValue(0)
def on(self) -> bool:
return self.value() == self.sliderRange
def setOn(self, on: bool=True) -> None:
if on:
self.setValue(self.sliderRange)
else:
self.setValue(0)
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
b = QToggleSwitch()
b.show()
sys.exit(app.exec_())
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