覆盖 measure/arrange 将隐藏按钮控件

Question

我有以下

public class MatrixButton : Button
{
  public MatrixButton()
  {
    Height = 20;
    Width = 44;
    Content = "foo";
  }

  protected override Size MeasureOverride(Size constraint)
  {
    var measureOverride = new Size(44, 20);
    return measureOverride;
  }

  protected override Size ArrangeOverride(Size arrangeBounds)
  {
    var arrangeOverride = new Size(44, 20);
    return arrangeOverride;
  }
}

现在我把那个按钮放在一个空的 window 中，就像这样：

public partial class MainWindow : Window
{
  public MainWindow()
  {
    InitializeComponent();
    Content = new MatrixButton();

  }
}

由于某种原因，该按钮在 window 中不可见。有谁知道为什么？如果我删除覆盖，按钮当然会正确显示...

编辑： 原因是按钮集成在一个复杂的布局中，其中有很多按钮，布局过程会消耗大量时间，但按钮的大小将始终相同

Answer 1

即使想限制大小，还是要调用Button子元素的基方法，按预期进行测量和排列：

protected override Size MeasureOverride(Size constraint)
{
    var measureOverride = new Size(44, 20);
    base.MeasureOverride(measureOverride);
    return measureOverride;
}

protected override Size ArrangeOverride(Size arrangeBounds)
{
    var arrangeOverride = new Size(44, 20);
    base.ArrangeOverride(arrangeOverride);
    return arrangeOverride;
}

覆盖 measure/arrange 将隐藏按钮控件

Override measure/arrange will hide button control

c#

wpf

arrangeoverride