问题
I am trying to create toggle button in qt designer. I refer on internet also but i couldn't find how to do that. Can anyone know how to do toggle switch button. I have attached a sample button image.
EDIT
I created a text box below that i want this toggle button. When i try to add it throws me error. How to add the button below the text area? i have attached the code snippet also.
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QPropertyAnimation, QRectF, QSize, Qt, pyqtProperty
from PyQt5.QtGui import QPainter
from PyQt5.QtWidgets import (
QAbstractButton,
QApplication,
QHBoxLayout,
QSizePolicy,
QWidget,
)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(472, 180)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.url = QtWidgets.QLineEdit(self.centralwidget)
self.url.setGeometry(QtCore.QRect(30, 20, 411, 31))
font = QtGui.QFont()
font.setFamily("MS Shell Dlg 2")
font.setPointSize(10)
font.setBold(True)
font.setWeight(75)
self.url.setFont(font)
self.url.setAutoFillBackground(False)
self.url.setStyleSheet("border-radius:10px;")
self.url.setAlignment(QtCore.Qt.AlignCenter)
self.url.setCursorMoveStyle(QtCore.Qt.LogicalMoveStyle)
self.url.setObjectName("url")
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 472, 21))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.url.setPlaceholderText(_translate("MainWindow", "Playlist URL"))
if __name__ == "__main__":
import sys
main()
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
回答1:
Qt Designer to set the position and initialize some properties of the widgets in a window, but it does not work to create widgets with custom painted as the switch so you will have to implement with python. Long ago for a project implement a switch so it will show that code:
from PyQt5.QtCore import QObject, QSize, QPointF, QPropertyAnimation, QEasingCurve, pyqtProperty, pyqtSlot, Qt
from PyQt5.QtGui import QPainter, QPalette, QLinearGradient, QGradient
from PyQt5.QtWidgets import QAbstractButton, QApplication, QWidget, QHBoxLayout, QLabel
class SwitchPrivate(QObject):
def __init__(self, q, parent=None):
QObject.__init__(self, parent=parent)
self.mPointer = q
self.mPosition = 0.0
self.mGradient = QLinearGradient()
self.mGradient.setSpread(QGradient.PadSpread)
self.animation = QPropertyAnimation(self)
self.animation.setTargetObject(self)
self.animation.setPropertyName(b'position')
self.animation.setStartValue(0.0)
self.animation.setEndValue(1.0)
self.animation.setDuration(200)
self.animation.setEasingCurve(QEasingCurve.InOutExpo)
self.animation.finished.connect(self.mPointer.update)
@pyqtProperty(float)
def position(self):
return self.mPosition
@position.setter
def position(self, value):
self.mPosition = value
self.mPointer.update()
def draw(self, painter):
r = self.mPointer.rect()
margin = r.height()/10
shadow = self.mPointer.palette().color(QPalette.Dark)
light = self.mPointer.palette().color(QPalette.Light)
button = self.mPointer.palette().color(QPalette.Button)
painter.setPen(Qt.NoPen)
self.mGradient.setColorAt(0, shadow.darker(130))
self.mGradient.setColorAt(1, light.darker(130))
self.mGradient.setStart(0, r.height())
self.mGradient.setFinalStop(0, 0)
painter.setBrush(self.mGradient)
painter.drawRoundedRect(r, r.height()/2, r.height()/2)
self.mGradient.setColorAt(0, shadow.darker(140))
self.mGradient.setColorAt(1, light.darker(160))
self.mGradient.setStart(0, 0)
self.mGradient.setFinalStop(0, r.height())
painter.setBrush(self.mGradient)
painter.drawRoundedRect(r.adjusted(margin, margin, -margin, -margin), r.height()/2, r.height()/2)
self.mGradient.setColorAt(0, button.darker(130))
self.mGradient.setColorAt(1, button)
painter.setBrush(self.mGradient)
x = r.height()/2.0 + self.mPosition*(r.width()-r.height())
painter.drawEllipse(QPointF(x, r.height()/2), r.height()/2-margin, r.height()/2-margin)
@pyqtSlot(bool, name='animate')
def animate(self, checked):
self.animation.setDirection(QPropertyAnimation.Forward if checked else QPropertyAnimation.Backward)
self.animation.start()
class Switch(QAbstractButton):
def __init__(self, parent=None):
QAbstractButton.__init__(self, parent=parent)
self.dPtr = SwitchPrivate(self)
self.setCheckable(True)
self.clicked.connect(self.dPtr.animate)
def sizeHint(self):
return QSize(84, 42)
def paintEvent(self, event):
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing)
self.dPtr.draw(painter)
def resizeEvent(self, event):
self.update()
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
w = Switch()
w.show()
sys.exit(app.exec_())
Note: Another possible solution within the Qt world is to use the QML Switch1, 2 component.
Note: In this post I point out how to add custom widgets to a .ui file.
回答2:
A possible solution is to use a stylesheet with a QCheckBox. Just edit the stylesheet for the check box with the following code:
QCheckBox::indicator:unchecked {
image: url(switch_off.png);
}
QCheckBox::indicator:checked {
image: url(switch_on.png);
}
Minimal running example:
from PyQt5 import QtWidgets
import sys
app = QtWidgets.QApplication(sys.argv)
switch = QtWidgets.QCheckBox()
switch.setStyleSheet('''
QCheckBox::indicator:unchecked {
image: url(switch_off.png);
}
QCheckBox::indicator:checked {
image: url(switch_on.png);
}
''')
switch.show()
sys.exit(app.exec_())
Unfortunately, this doesn't always work well if you need some resizing and want the checkbox to adjust its appearance.
The only alternative is to subclass a QPushButton/QAbstractButton (with the checkable() property set to True) and implement the paintEvent on your own, as already suggested by the answer from eyllanesc.
来源：https://stackoverflow.com/questions/62363953/how-to-create-toggle-switch-button-in-qt-designer