QTableView性能

Question

我用的是QTableView和PyQt5。一旦我开始显示几千行，性能就很糟糕。我尝试了this question的建议，但是Qt框架和QTreeView对我来说并不可行。是否有人对优化QTableView的性能有其他想法？

Answer 1

您可以通过实现QTreeView的setUniformRowHeights来反映sizeHintForRow的效果。

class UniformRowHeights(QTableView):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._row_height = None
    def sizeHintForRow(self, row):
        model = self.model()
        if row < 0 or row >= model.rowCount():
            # Mirror super implementation.
            return -1
        return self.get_row_height()
    def get_row_height(self):
        if self._row_height is None:
            self._row_height = max(self._get_cell_heights())
        return self._row_height
    def changeEvent(self, event):
        # This for instance happens when the style sheet changed. It may affect
        # the calculated row height. So invalidate:
        self._row_height = None
        super().changeEvent(event)
    def _get_cell_heights(self, row=0):
        self.ensurePolished()
        option = self.viewOptions()
        model = self.model()
        for column in range(model.columnCount()):
            index = model.index(row, column)
            delegate = self.itemDelegate(index)
            if delegate:
                yield delegate.sizeHint(option, index).height()