<div dir="ltr"><div dir="ltr"><div dir="ltr">You'll have to subclass QPushButton, provide a way to set/change the radius, and at least override the paintEvent to actually draw the circle and possibly the sizeHint to report the preferred size of the button (based on the radius), unless you to set a fixed size when setting the radius.</div><div dir="ltr"><br></div><div>In the following example I've used two gradients to get a round button with borders that have a "shadow" effect: it's composed of a conical gradient with a superimposed radial gradient to "mask" the center of the conical.</div><div dir="ltr"><div><br></div><div><div><font face="monospace">class CircleButton(QtWidgets.QPushButton):</font></div><div><font face="monospace"> def __init__(self, radius=None, parent=None):</font></div><div><font face="monospace"> super().__init__(parent)</font></div><div><font face="monospace"> if radius is None:</font></div><div><font face="monospace"> radius = self.font().pointSize() * 2</font></div><div><font face="monospace"> self.setRadius(radius)</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> # use the palette as source for the colors</font></div><div><font face="monospace"> palette = self.palette()</font></div><div><font face="monospace"> light = palette.color(palette.Light)</font></div><div><font face="monospace"> midlight = palette.color(palette.Midlight)</font></div><div><font face="monospace"> mid = palette.color(palette.Mid)</font></div><div><font face="monospace"> dark = palette.color(palette.Dark)</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> # a radial gradient for the "shadow effect" when button is unpressed</font></div><div><font face="monospace"> self.backgroundUp = QtGui.QConicalGradient(.5, .5, 135)</font></div><div><font face="monospace"> self.backgroundUp.setCoordinateMode(self.backgroundUp.ObjectBoundingMode)</font></div><div><font face="monospace"> self.backgroundUp.setStops([</font></div><div><font face="monospace"> (0.0, light), </font></div><div><font face="monospace"> (0.3, dark), </font></div><div><font face="monospace"> (0.6, dark), </font></div><div><font face="monospace"> (1.0, light), </font></div><div><font face="monospace"> ])</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> # the same as above, but inverted for pressed state</font></div><div><font face="monospace"> self.backgroundDown = QtGui.QConicalGradient(.5, .5, 315)</font></div><div><font face="monospace"> self.backgroundDown.setCoordinateMode(self.backgroundDown.ObjectBoundingMode)</font></div><div><font face="monospace"> self.backgroundDown.setStops(self.backgroundUp.stops())</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> # a "mask" for the conical gradient</font></div><div><font face="monospace"> self.ringShapeDown = QtGui.QRadialGradient(.5, .5, .5)</font></div><div><font face="monospace"> self.ringShapeDown.setCoordinateMode(self.ringShapeDown.ObjectBoundingMode)</font></div><div><font face="monospace"> self.ringShapeDown.setStops([</font></div><div><font face="monospace"> (0.7536231884057971, midlight), </font></div><div><font face="monospace"> (0.7960662525879917, QtCore.Qt.transparent), </font></div><div><font face="monospace"> ])</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> self.ringShapeUp = QtGui.QRadialGradient(.5, .5, .5)</font></div><div><font face="monospace"> self.ringShapeUp.setCoordinateMode(self.ringShapeUp.ObjectBoundingMode)</font></div><div><font face="monospace"> self.ringShapeUp.setStops([</font></div><div><font face="monospace"> (0.7536231884057971, mid), </font></div><div><font face="monospace"> (0.7960662525879917, QtCore.Qt.transparent), </font></div><div><font face="monospace"> (0.9627329192546584, QtCore.Qt.transparent), </font></div><div><font face="monospace"> ])</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> def getButtonRect(self):</font></div><div><font face="monospace"> # just a helper function to avoid repetitions</font></div><div><font face="monospace"> size = min(self.width(), self.height()) - 1</font></div><div><font face="monospace"> rect = QtCore.QRect(0, 0, size, size)</font></div><div><font face="monospace"> rect.moveCenter(self.rect().center())</font></div><div><font face="monospace"> return rect</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> def mousePressEvent(self, event):</font></div><div><font face="monospace"> # ensure that the click happens within the circle</font></div><div><font face="monospace"> path = QtGui.QPainterPath()</font></div><div><font face="monospace"> path.addEllipse(QtCore.QRectF(self.getButtonRect()))</font></div><div><font face="monospace"> if path.contains(event.pos()):</font></div><div><font face="monospace"> super().mousePressEvent(event)</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> def setRadius(self, radius):</font></div><div><font face="monospace"> self.radius = radius</font></div><div><font face="monospace"> # notify the layout manager that the size hint has changed</font></div><div><font face="monospace"> self.updateGeometry()</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> def sizeHint(self):</font></div><div><font face="monospace"> return QtCore.QSize(self.radius, self.radius)</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> def hasHeightForWidth(self):</font></div><div><font face="monospace"> return True</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> def heightForWidth(self, width):</font></div><div><font face="monospace"> return width</font></div><div><font face="monospace"><br></font></div><div><font face="monospace"> def paintEvent(self, event):</font></div><div><font face="monospace"> qp = QtGui.QPainter(self)</font></div><div><font face="monospace"> qp.setRenderHints(qp.Antialiasing)</font></div><div><font face="monospace"> qp.translate(.5, .5)</font></div><div><font face="monospace"> qp.setPen(QtCore.Qt.NoPen)</font></div><div><font face="monospace"> rect = self.getButtonRect()</font></div><div><font face="monospace"> if self.isDown() or self.isChecked():</font></div><div><font face="monospace"> qp.setBrush(self.backgroundDown)</font></div><div><font face="monospace"> qp.drawEllipse(rect)</font></div><div><font face="monospace"> qp.setBrush(self.ringShapeDown)</font></div><div><font face="monospace"> qp.drawEllipse(rect)</font></div><div><font face="monospace"> else:</font></div><div><font face="monospace"> qp.setBrush(self.backgroundUp)</font></div><div><font face="monospace"> qp.drawEllipse(rect)</font></div><div><font face="monospace"> qp.setBrush(self.ringShapeUp)</font></div><div><font face="monospace"> qp.drawEllipse(rect)</font></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il giorno mar 3 mar 2020 alle ore 13:08 Souvik Dutta Chowdhury <<a href="mailto:souvik.viksou@outlook.com">souvik.viksou@outlook.com</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">I want to make a perfect circular button and want to set a custom radius. How to do it?</div>_______________________________________________<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature">È difficile avere una convinzione precisa quando si parla delle ragioni del cuore. - "Sostiene Pereira", Antonio Tabucchi<br><a href="http://www.jidesk.net" target="_blank">http://www.jidesk.net</a></div>