我想要图片中的效果。 qlabel在布局中,并且字体居中。下面是我编写的代码,与我想要的代码不同。首先,qlabel在布局之外,其次,字体未居中。
import sys
from PyQt4.QtCore import Qt
from PyQt4.QtGui import QLabel, QApplication, QWidget, QVBoxLayout, QStyleOption, QPainter, QStyle
class Example(QWidget):
def __init__(self):
super(Example, self).__init__()
self.setGeometry(100, 100, 500, 500)
vbox = QVBoxLayout()
self.setLayout(vbox)
a = QLabel('aaa')
b = QLabel('bbb')
vbox.addWidget(a)
vbox.addWidget(a, alignment=Qt.AlignHCenter | Qt.AlignTop)
vbox.addWidget(b, alignment=Qt.AlignHCenter | Qt.AlignBottom)
self.setStyleSheet("""
Example{
border-width: 1px;
border-style: solid;
border-color: red;
min-width:500px;
max-width:500px;
min-height:500px;
max-height:500px;
padding:1px 1px 1px 1px;
margin-bottom:30px;
}
QLabel{
min-width:500px;
max-width:500px;
min-height:50px;
max-height:50px;
margin:0px;
padding:0px;
background-color:#cdcdcd;
text-align: center center;
}
""")
self.show()
def paintEvent(self, event):
super(Example, self).paintEvent(event)
opt = QStyleOption()
opt.initFrom(self)
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing)
self.style().drawPrimitive(QStyle.PE_Widget, opt, painter, self)
def main():
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
布局的逻辑是处理元素的几何,但是您也要使用样式表处理几何,这会引起您观察到的问题。另一方面,QLabel没有text-align属性,但必须使用qproperty-alignment: AlignCenter;
。
为避免这种情况,最好避免使用样式表来管理几何,而是使用类的方法来解决,考虑解决方案是:
import sys
from PyQt4.QtCore import Qt
from PyQt4.QtGui import (
QLabel,
QApplication,
QWidget,
QVBoxLayout,
QStyleOption,
QPainter,
QStyle,
)
class Example(QWidget):
def __init__(self):
super(Example, self).__init__()
self.setGeometry(100, 100, 500, 500)
self.label_a = QLabel("aaa")
self.label_b = QLabel("bbb")
self.label_a.setFixedHeight(50)
self.label_b.setFixedHeight(50)
vbox = QVBoxLayout(self)
vbox.setContentsMargins(1, 1, 1, 1)
vbox.addWidget(self.label_a)
vbox.addWidget(QWidget(), stretch=1)
vbox.addWidget(self.label_b)
self.setFixedSize(500, 500)
self.setStyleSheet(
"""
Example{
border-width: 1px;
border-style: solid;
border-color: red;
padding:1px 1px 1px 1px;
}
QLabel{
margin:0px;
padding:0px;
background-color:#cdcdcd;
qproperty-alignment: AlignCenter;
}
"""
)
def paintEvent(self, event):
super(Example, self).paintEvent(event)
opt = QStyleOption()
opt.initFrom(self)
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing)
self.style().drawPrimitive(QStyle.PE_Widget, opt, painter, self)
def main():
app = QApplication(sys.argv)
ex = Example()
ex.show()
sys.exit(app.exec_())
if __name__ == "__main__":
main()