像QTextEdit这样的QWidget会自动将其高度包装到其内容中吗？

Question

我正在创建一个带有一些QTextEdit小部件的表单.

QTextEdit的默认高度超过单行文本,并且当内容的高度超过QTextEdit的高度时,它会创建滚动条来滚动内容.

我想重写此行为以创建一个QTextEdit,而不是将其高度包装到其内容.这意味着默认高度将是一行,而在包装或输入新行时,QTextEdit会自动增加其高度.每当内容高度超过QTextEdit的高度时,后者不应创建滚动条,而只是增加高度.

我该怎么做呢？谢谢.

Answer 1

这几乎就像我前面回答的一个问题,关于让QTextEdit在内容变化时调整其高度:PySide Qt:TextEdit Widget的自动垂直增长

我正在回答而不是标记副本,因为我怀疑你可能想要一个变体.如果您希望我扩展此答案,请与我们联系:

另一个问题有多个部分.以下是不断增长的高度小部件的摘录:

class Window(QtGui.QDialog):

    def __init__(self):
        super(Window, self).__init__()
        self.resize(600,400)

        self.mainLayout = QtGui.QVBoxLayout(self)
        self.mainLayout.setMargin(10)

        self.scroll = QtGui.QScrollArea()
        self.scroll.setWidgetResizable(True)
        self.scroll.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
        self.mainLayout.addWidget(self.scroll)

        scrollContents = QtGui.QWidget()
        self.scroll.setWidget(scrollContents)

        self.textLayout = QtGui.QVBoxLayout(scrollContents)
        self.textLayout.setMargin(10)

        for _ in xrange(5):
            text = GrowingTextEdit()
            text.setMinimumHeight(50)
            self.textLayout.addWidget(text)


class GrowingTextEdit(QtGui.QTextEdit):

    def __init__(self, *args, **kwargs):
        super(GrowingTextEdit, self).__init__(*args, **kwargs)  
        self.document().contentsChanged.connect(self.sizeChange)

        self.heightMin = 0
        self.heightMax = 65000

    def sizeChange(self):
        docHeight = self.document().size().height()
        if self.heightMin <= docHeight <= self.heightMax:
            self.setMinimumHeight(docHeight)

Answer 2

以下代码将QTextEdit小部件设置为内​​容的高度:

# using QVBoxLayout in this example
grid = QVBoxLayout()
text_edit = QTextEdit('Some content. I make this a little bit longer as I want to see the effect on a widget with more than one line.')

# read-only
text_edit.setReadOnly(True)

# no scroll bars in this example
text_edit.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff) 
text_edit.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff) 
text_edit.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

# you can set the width to a specific value
# text_edit.setFixedWidth(400)

# this is the trick, we nee to show the widget without making it visible.
# only then the document is created and the size calculated.

# Qt.WA_DontShowOnScreen = 103, PyQt does not have this mapping?!
text_edit.setAttribute(103)
text_edit.show()

# now that we have a document we can use it's size to set the QTextEdit's size
# also we add the margins
text_edit.setFixedHeight(text_edit.document().size().height() + text_edit.contentsMargins().top()*2)

# finally we add the QTextEdit to our layout
grid.addWidget(text_edit)

我希望这有帮助.