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copied!<p>The <strong>setAttribute( Qt.WA_TranslucentBackground, True)</strong> method shown <strong><a href="https://stackoverflow.com/questions/1909092/qt4-transparent-window-with-rounded-corners">here</a></strong> also works... Simply set this attribute on your top-level window, and paint the shape of your window using a QPainterPath in a <strong>paintEvent()</strong> method override.</p> <p>Here's some <strong><em>(python)</em></strong> code that might help you construct, or paint, the QPainterPath for a rectangle with rounded corners.</p> <pre><code>def drawPartiallyRoundedRect(painter,x,y,w,h, radiusTR, radiusBR, radiusBL, radiusTL, doFill,fillColor, doLine=False,lineColor=None,lineWidth=1, antiAlias=True): w2 = int(w/2.0) h2 = int(h/2.0) if (doLine): x += lineWidth/2.0 y += lineWidth/2.0 w -= lineWidth h -= lineWidth T = y L = x R = x + w B = y + h # clamp values to fit within rect if (radiusTR > w2): radiusTR = w2 if (radiusTR > h2): radiusTR = h2 if (radiusTL > w2): radiusTL = w2 if (radiusTL > h2): radiusTL = h2 if (radiusBL > w2): radiusBL = w2 if (radiusBL > h2): radiusBL = h2 if (radiusBR > w2): radiusBR = w2 if (radiusBR > h2): radiusBR = h2 diamTR = radiusTR + radiusTR diamBR = radiusBR + radiusBR diamBL = radiusBL + radiusBL diamTL = radiusTL + radiusTL p = QPainterPath() if (radiusTR > 0.0): p.moveTo(R, T + radiusTR); p.arcTo(R-diamTR, T, diamTR, diamTR, 0.0, 90.0) # TR else: p.moveTo(R,T) if (radiusTL > 0.0): p.arcTo(L, T, diamTL, diamTL, 90.0, 90.0) # TL else: p.lineTo(L,T) if (radiusBL > 0.0): p.arcTo(L, B-diamBL, diamBL, diamBL, 180.0, 90.0); # BL else: p.lineTo(L,B) if (radiusBR > 0.0): p.arcTo(R-diamBR, B-diamBR, diamBR, diamBR, 270.0, 90.0); # BR else: p.lineTo(R,B) p.closeSubpath(); if (antiAlias): painter.setRenderHint(QPainter.Antialiasing,True) else: painter.setRenderHint(QPainter.Antialiasing,False) if (doFill and fillColor): painter.setBrush( fillColor ) elif ( doFill ): # pass doFill and None for fillColor to use current brush pass else: painter.setBrush( Qt.NoBrush ) if ((lineWidth != 0.0) and doLine and lineColor): pen = QPen( lineColor, lineWidth, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin ) painter.setPen( pen ) else: painter.setPen( Qt.NoPen ) painter.drawPath( p ) </code></pre>

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