如何将自定义面板中的子元素强制为特定大小？

Question

我在一个面板中有一堆高度相同的项目。我希望面板中的项目根据面板本身的最大宽度缩小宽度。

例如 - 面板的宽度为 400，面板中有 4 个项目，每个项目的宽度为 100。如果是 2 个项目，则每个项目的宽度为 200。

第二次使用项目的预期宽度调用 child.Measure 后，child.DesiredSize 完全变为其他内容。我如何强制项目采用我给它的宽度？

public class DynamicShrinkPanel : StackPanel
{
    public DynamicShrinkPanel()
    {
    }

    protected override Size MeasureOverride(Size constraint)
    {
        Size desiredSize = new Size();
        foreach (UIElement child in InternalChildren)
        {
            // First call to get the desired size.
            child.Measure(constraint);
            double properChildWidth = constraint.Width / InternalChildren.Count;
            // Second call to set what I want, doesn't do what I expect
            child.Measure(new Size(properChildWidth, child.DesiredSize.Height));
            desiredSize.Height = child.DesiredSize.Height;
            desiredSize.Width += child.DesiredSize.Width;
        }

        return desiredSize;
    }
}

Answer 1

我想出来了，不要使用 MeassureOverride 来计算确切的大小，而是使用 ArrangeOverride 方法。

protected override Size MeasureOverride(Size constraint)
{
     Size desiredSize = new Size();
     foreach (UIElement child in InternalChildren)
     {
         child.Measure(constraint);
         desiredSize.Height = child.DesiredSize.Height;
         desiredSize.Width = constraint.Width;
     }

     return desiredSize;
 }

 protected override Size ArrangeOverride(Size arrangeSize)
  {
        double offset = 0;
        double properWidth = arrangeSize.Width / InternalChildren.Count;
        foreach (UIElement child in InternalChildren)
        {
             child.Arrange(new Rect(offset, 0, properWidth, arrangeSize.Height));
             offset += properWidth;
        }

        return arrangeSize;
    }

如何将自定义面板中的子元素强制为特定大小？

How do you force children elements in a custom panel to a particular size?

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