设置包含 TableWidget 的对话框窗口的最佳大小

Question

我编写了一个小对话框，其中仅包含一个 TableWigdet。如何确定表格的水平尺寸？我想调整对话框窗口的大小，以便在没有水平滚动条的情况下显示表格。

Answer 1

据我所知，没有简单的方法可以做到这一点。您必须对表格列的宽度进行求和，然后为标题添加空间。您还必须为垂直滚动条和小部件框架添加空间。这是一种方法，

class myTableWidget(QtGui.QTableWidget):

    def sizeHint(self):
        width = 0
        for i in range(self.columnCount()):
            width += self.columnWidth(i)

        width += self.verticalHeader().sizeHint().width()

        width += self.verticalScrollBar().sizeHint().width()
        width += self.frameWidth()*2

        return QtCore.QSize(width,self.height())

Answer 2

您可以使用类似的东西（我希望有足够的注释）：

from PyQt4.QtCore import *
from PyQt4.QtGui import *

class MyTableWidget(QTableWidget):  
    def __init__(self, x, y, parent = None):
        super(MyTableWidget, self).__init__(x, y, parent)

        self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)

        # To force the width to use sizeHint().width()
        self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Preferred)

        # To readjust the size automatically...
        # ... when columns are added or resized
        self.horizontalHeader().geometriesChanged \
             .connect(self.updateGeometryAsync)
        self.horizontalHeader().sectionResized \
             .connect(self.updateGeometryAsync)        
        # ... when a row header label changes and makes the
        # width of the vertical header change too
        self.model().headerDataChanged.connect(self.updateGeometryAsync)

    def updateGeometryAsync(self):      
        QTimer.singleShot(0, self.updateGeometry)

    def sizeHint(self):
        height = QTableWidget.sizeHint(self).height()

        # length() includes the width of all its sections
        width = self.horizontalHeader().length() 

        # you add the actual size of the vertical header and scrollbar
        # (not the sizeHint which would only be the preferred size)                  
        width += self.verticalHeader().width()        
        width += self.verticalScrollBar().width()       

        # and the margins which include the frameWidth and the extra 
        # margins that would be set via a stylesheet or something else
        margins = self.contentsMargins()
        width += margins.left() + margins.right()

        return QSize(width, height)

当行标题发生变化时，整个垂直标题的宽度会发生变化，但在信号 headerDataChanged 发出后不会立即发生变化。
那就是为什么我在QTableWidget实际完成后使用QTimer调用updateGeometry（当sizeHint更改时必须调用）更新了垂直标题宽度。