Added original switch code from stack overflow
This commit is contained in:
Veronica K. B. Olsen
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# -*- coding: utf-8 -*-
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"""novelWriter Addition QSwitch
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novelWriter – Addition QSwitch
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================================
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A custom Qt switch button
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File History:
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Created: 2020-05-03 [0.4.5]
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This class is based on Stack Overflow code by Stefan Scherfke, based
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again on contribution by IMAN4K, published under license CC BY-SA 4.0.
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https://stackoverflow.com/a/51825815/5825851
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The above code has been modified to integrate with novelWriter, and
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re-released under compatible GPLv3 (see creativecommons.org).
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This file is a part of novelWriter
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Copyright 2020, Veronica Berglyd Olsen
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see https://www.gnu.org/licenses/.
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"""
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import logging
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import nw
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from PyQt5.QtCore import QPropertyAnimation, QRectF, QSize, Qt, pyqtProperty
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from PyQt5.QtGui import QPainter
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from PyQt5.QtWidgets import (
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QAbstractButton,
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QApplication,
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QHBoxLayout,
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QSizePolicy,
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QWidget,
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)
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logger = logging.getLogger(__name__)
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class Switch(QAbstractButton):
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def __init__(self, parent=None, track_radius=10, thumb_radius=8):
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super().__init__(parent=parent)
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self.setCheckable(True)
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self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
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self._track_radius = track_radius
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self._thumb_radius = thumb_radius
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self._margin = max(0, self._thumb_radius - self._track_radius)
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self._base_offset = max(self._thumb_radius, self._track_radius)
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self._end_offset = {
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True: lambda: self.width() - self._base_offset,
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False: lambda: self._base_offset,
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}
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self._offset = self._base_offset
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palette = self.palette()
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if self._thumb_radius > self._track_radius:
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self._track_color = {
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True: palette.highlight(),
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False: palette.dark(),
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}
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self._thumb_color = {
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True: palette.highlight(),
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False: palette.light(),
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}
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self._text_color = {
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True: palette.highlightedText().color(),
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False: palette.dark().color(),
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}
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self._thumb_text = {
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True: '',
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False: '',
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}
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self._track_opacity = 0.5
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else:
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self._thumb_color = {
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True: palette.highlightedText(),
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False: palette.light(),
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}
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self._track_color = {
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True: palette.highlight(),
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False: palette.dark(),
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}
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self._text_color = {
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True: palette.highlight().color(),
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False: palette.dark().color(),
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}
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self._thumb_text = {
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True: '✔',
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False: '✕',
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}
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self._track_opacity = 1
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@pyqtProperty(int)
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def offset(self):
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return self._offset
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@offset.setter
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def offset(self, value):
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self._offset = value
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self.update()
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def sizeHint(self): # pylint: disable=invalid-name
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return QSize(
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4 * self._track_radius + 2 * self._margin,
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2 * self._track_radius + 2 * self._margin,
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)
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def setChecked(self, checked):
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super().setChecked(checked)
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self.offset = self._end_offset[checked]()
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def resizeEvent(self, event):
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super().resizeEvent(event)
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self.offset = self._end_offset[self.isChecked()]()
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def paintEvent(self, event): # pylint: disable=invalid-name, unused-argument
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p = QPainter(self)
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p.setRenderHint(QPainter.Antialiasing, True)
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p.setPen(Qt.NoPen)
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track_opacity = self._track_opacity
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thumb_opacity = 1.0
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text_opacity = 1.0
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if self.isEnabled():
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track_brush = self._track_color[self.isChecked()]
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thumb_brush = self._thumb_color[self.isChecked()]
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text_color = self._text_color[self.isChecked()]
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else:
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track_opacity *= 0.8
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track_brush = self.palette().shadow()
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thumb_brush = self.palette().mid()
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text_color = self.palette().shadow().color()
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p.setBrush(track_brush)
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p.setOpacity(track_opacity)
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p.drawRoundedRect(
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self._margin,
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self._margin,
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self.width() - 2 * self._margin,
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self.height() - 2 * self._margin,
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self._track_radius,
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self._track_radius,
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)
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p.setBrush(thumb_brush)
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p.setOpacity(thumb_opacity)
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p.drawEllipse(
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self.offset - self._thumb_radius,
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self._base_offset - self._thumb_radius,
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2 * self._thumb_radius,
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2 * self._thumb_radius,
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)
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p.setPen(text_color)
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p.setOpacity(text_opacity)
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font = p.font()
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font.setPixelSize(1.5 * self._thumb_radius)
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p.setFont(font)
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p.drawText(
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QRectF(
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self.offset - self._thumb_radius,
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self._base_offset - self._thumb_radius,
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2 * self._thumb_radius,
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2 * self._thumb_radius,
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),
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Qt.AlignCenter,
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self._thumb_text[self.isChecked()],
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)
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def mouseReleaseEvent(self, event): # pylint: disable=invalid-name
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super().mouseReleaseEvent(event)
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if event.button() == Qt.LeftButton:
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anim = QPropertyAnimation(self, b'offset', self)
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anim.setDuration(120)
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anim.setStartValue(self.offset)
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anim.setEndValue(self._end_offset[self.isChecked()]())
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anim.start()
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def enterEvent(self, event): # pylint: disable=invalid-name
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self.setCursor(Qt.PointingHandCursor)
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super().enterEvent(event)
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# def main():
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# app = QApplication([])
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# # Thumb size < track size (Gitlab style)
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# s1 = Switch()
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# s1.toggled.connect(lambda c: print('toggled', c))
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# s1.clicked.connect(lambda c: print('clicked', c))
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# s1.pressed.connect(lambda: print('pressed'))
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# s1.released.connect(lambda: print('released'))
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# s2 = Switch()
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# s2.setEnabled(False)
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# # Thumb size > track size (Android style)
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# s3 = Switch(thumb_radius=11, track_radius=8)
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# s4 = Switch(thumb_radius=11, track_radius=8)
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# s4.setEnabled(False)
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# l = QHBoxLayout()
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# l.addWidget(s1)
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# l.addWidget(s2)
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# l.addWidget(s3)
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# l.addWidget(s4)
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# w = QWidget()
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# w.setLayout(l)
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# w.show()
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# app.exec()
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# if __name__ == '__main__':
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# main()
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