Question

我想要一个QTreeWidget，它有一个首选高度，显示所有内容而没有滚动条。用例是双重的：1）QVBoxLayout中的树木占据与其内容成比例的空间; 2）QScrollArea中的树木，其中所有树木应该只有一个滚动条而不是单个滚动条。< / p>

我尝试查询树及其视口，但无论它们有多少内容，它们总是返回相同的值：

size = PySide.QtCore.QSize(100, 30)
sizeHint = PySide.QtCore.QSize(256, 192)
minimumSize = PySide.QtCore.QSize(0, 0)
minimumSizeHint = PySide.QtCore.QSize(76, 76)
maximumSize = PySide.QtCore.QSize(16777215, 16777215)
baseSize = PySide.QtCore.QSize(0, 0)
frameSize = PySide.QtCore.QSize(100, 30)
viewport.size = PySide.QtCore.QSize(94, 5)
viewport.sizeHint = PySide.QtCore.QSize(-1, -1)
viewport.minimumSize = PySide.QtCore.QSize(0, 0)
viewport.minimumSizeHint = PySide.QtCore.QSize(-1, -1)
viewport.maximumSize = PySide.QtCore.QSize(16777215, 16777215)
viewport.baseSize = PySide.QtCore.QSize(0, 0)
viewport.frameSize = PySide.QtCore.QSize(94, 5)

接下来，我尝试通过为每个项目添加所有大小提示来计算大小：

    size = super().sizeHint()
    height = self.horizontalScrollBar().sizeHint().height()
    rows = 0
    it = QtGui.QTreeWidgetItemIterator(self)
    while it.value() is not None:
        rows += 1
        size = it.value().sizeHint(0)
        height += size.height()
        it += 1
    size = QtCore.QSize(size.width(), height)

但所有项目返回的大小为（-1，-1）。即使在显示树之后，也不仅仅是在施工期间。

那我该如何计算树的高度？

Answer 1

诀窍似乎是查询宽度的标题，单个行高的树，并在所有方面添加frameWidth，如下所示：

class TreeWidget(QtGui.QTreeWidget):
    def sizeHint(self):
        print("TreeWidget.sizeHint()")
        print("  frameWidth = {0}".format(self.frameWidth()))
        height = 2 * self.frameWidth() # border around tree
        if not self.isHeaderHidden():
            header = self.header()
            headerSizeHint = header.sizeHint()
            print("  headerSizeHint = {0}".format(headerSizeHint))
            height += headerSizeHint.height()
        rows = 0
        it = QtGui.QTreeWidgetItemIterator(self)
        while it.value() is not None:
            rows += 1
            index = self.indexFromItem(it.value())
            print("  rowHeight = {0}".format(self.rowHeight(index)))
            height += self.rowHeight(index)
            it += 1
        print("  computed height for {0} rows = {1}".format(rows, height))
        return QtCore.QSize(header.length() + 2 * self.frameWidth(), height)

如何计算QTreeWidget内容的高度？

1 个答案: