问题描述
import sys
from PyQt4 import QtCore,QtGui
class Example(QtGui.QWidget):
def __init__(self):
super(Example,self).__init__()
self.initUI()
def clicked(self,name):
self.drop_btns_hide(self.dropdown)
print("Clicked on {}".format(name))
def initUI(self):
QtGui.QToolTip.setFont(QtGui.QFont('SansSerif',10))
self.phslst = ['abc','def','ghi','jkl']
self.setToolTip('This is a <b>QWidget</b> widget')
btn = QtGui.QToolButton(self)
btn.setToolTip('This is a <b>QPushButton</b> widget')
btn.resize(btn.sizeHint())
btn.move(50,50)
text = QtGui.QTextDocument()
text.setHtml('<b>'
'<font color="#0085C8" size="6" face="Avenir">'
'Select Phase'
'</font>'
'<font color="#d8d8d8" size="6">'
'▼'
'</font>'
'</b>')
pixmap = QtGui.Qpixmap(text.size().width(),text.size().height())
pixmap.fill(QtCore.Qt.transparent)
painter = QtGui.QPainter(pixmap)
text.drawContents(painter,QtCore.QRectF(pixmap.rect()))
icon = QtGui.QIcon(pixmap)
self.select_icon = icon
btn.setIcon(icon)
btn.setIconSize(pixmap.size())
btnA = QtGui.QPushButton('Test',self)
btnA.setToolTip('This is a <b>QPushButton</b> widget')
btnA.resize(btnA.sizeHint())
btnA.move(10,100)
self.setGeometry(300,300,250,250)
self.setwindowTitle('Tooltips')
self.show()
def main():
app = QtGui.QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
但我得到:
QPaintDevice: Cannot destroy paint device that is being painted
fish: “python QToolButton.py” terminated by signal SIGSEGV (Address boundary error)
我不明白为什么。
解决方法
QPainter 方法不会立即执行,因为出于效率原因,这些方法所做的是累积指令。这就是您的情况,因为 QPainter 仍然处于活动状态并且具有 QPixmap 的属性,这就是您收到该错误的原因,因此在这种情况下,解决方案是调用 end() 方法:
text = QtGui.QTextDocument()
text.setHtml('<b>'
'<font color="#0085C8" size="6" face="Avenir">'
'Select Phase'
'</font>'
'<font color="#d8d8d8" size="6">'
'▼'
'</font>'
'</b>')
pixmap = QtGui.QPixmap(text.size().toSize())
pixmap.fill(QtCore.Qt.transparent)
painter = QtGui.QPainter(pixmap)
text.drawContents(painter,QtCore.QRectF(pixmap.rect()))
painter.end() # <-- this line
icon = QtGui.QIcon(pixmap)
btn.setIcon(icon)
btn.setIconSize(pixmap.size())