PySide/PyQt基于minimumSize截断QLabel中的文本

Question

我想知道如何根据它的最大宽度/高度最好地截断QLabel中的文本.传入的文本可以是任何长度,但为了保持整洁的布局,我想截断长字符串以填充最大空间量(小部件的最大宽度/高度).

例如:

 'A very long string where there should only be a short one, but I can't control input to the widget as it's a user given value'

会成为:

'A very long string where there should only be a short one, but ...'

基于当前字体所需的空间.

我怎样才能做到最好？

这是我所追求的一个简单示例,虽然这是基于字数,而不是可用空间:

import sys
from PySide.QtGui import *
from PySide.QtCore import *


def truncateText(text):
    maxWords = 10
    words = text.split(' ')
    return ' '.join(words[:maxWords]) + ' ...'

app = QApplication(sys.argv)

mainWindow = QWidget()
layout = QHBoxLayout()
mainWindow.setLayout(layout)

text = 'this is a very long string, '*10
label = QLabel(truncateText(text))
label.setWordWrap(True)
label.setFixedWidth(200)
layout.addWidget(label)

mainWindow.show()
sys.exit(app.exec_())

Answer 1

更简单 - 使用QFontMetrics.elidedText方法并重载paintEvent,这是一个例子:

from PyQt4.QtCore import Qt
from PyQt4.QtGui import QApplication,\
                        QLabel,\
                        QFontMetrics,\
                        QPainter

class MyLabel(QLabel):
    def paintEvent( self, event ):
        painter = QPainter(self)

        metrics = QFontMetrics(self.font())
        elided  = metrics.elidedText(self.text(), Qt.ElideRight, self.width())

        painter.drawText(self.rect(), self.alignment(), elided)

if ( __name__ == '__main__' ):
    app = None
    if ( not QApplication.instance() ):
        app = QApplication([])

    label = MyLabel()
    label.setText('This is a really, long and poorly formatted runon sentence used to illustrate a point')
    label.setWindowFlags(Qt.Dialog)
    label.show()

    if ( app ):
        app.exec_()