python中fontsize_在PyQ中同步标签fontsize和布局

这包含在resizeEvent方法的重新实现中&＃xff0c;QLabel的字体大小根据其contentRect的大小进行更新。注意&＃xff0c;Qlabel的sizePolicy必须设置为Ignored&＃xff0c;这样才能正常工作。在import sys

from PyQt4 import QtGui

class myQLabel(QtGui.QLabel):

def __init__(self, *args, **kargs):

super(myQLabel, self).__init__(*args, **kargs)

self.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Ignored,

QtGui.QSizePolicy.Ignored))

self.setMinSize(14)

def setMinSize(self, minfs):

f &＃61; self.font()

f.setPixelSize(minfs)

br &＃61; QtGui.QFontMetrics(f).boundingRect(self.text())

self.setMinimumSize(br.width(), br.height())

def resizeEvent(self, event):

super(myQLabel, self).resizeEvent(event)

if not self.text():

return

# - fetch current parameters

f &＃61; self.font()

cr &＃61; self.contentsRect()

# - find the font size that fits the contentsRect -

fs &＃61; 1

while True:

f.setPixelSize(fs)

br &＃61; QtGui.QFontMetrics(f).boundingRect(self.text())

if br.height() <&＃61; cr.height() and br.width() <&＃61; cr.width():

fs &＃43;&＃61; 1

else:

f.setPixelSize(max(fs - 1, 1)) # backtrack

break

# - update font size -

self.setFont(f)

class myApplication(QtGui.QWidget):

def __init__(self, parent&＃61;None):

super(myApplication, self).__init__(parent)

# Prepare a Layout

grid &＃61; QtGui.QGridLayout()

for i in range(3):

grid.addWidget(myQLabel(&＃39;some text&＃39;), i, 0)

grid.setRowStretch(i, i&＃43;1)

grid.setRowMinimumHeight(i, 25)

self.setLayout(grid)

self.resize(500, 300)

if __name__ &＃61;&＃61; &＃39;__main__&＃39;:

app &＃61; QtGui.QApplication(sys.argv)

instance &＃61; myApplication()

instance.show()

sys.exit(app.exec_())

结果是&＃xff1a;

更新-resizeEvent优化&＃xff1a;

下面是resizeEvent方法的优化版本&＃xff0c;它应该可以产生更好的性能。它大大减少了寻找字体大小的最佳值所需的迭代次数。不过&＃xff0c;我还没有做过广泛的测试。在

^{pr2}$