c# - 绑定(bind)后如何计算MvxListView的高度？

Question

我想调整 MvxListView 的大小以使其显示 ScrollView 中的所有元素(我实际上想要带 Header 和 CustomAdapter 的 MvxListView，但这太难实现了)。

我尝试了几种方法，使用 OnMeasure

    protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        // Calculate entire height by providing a very large height hint.
        // View.MeasuredSizeMask represents the largest height possible.
        var expandSpec = MeasureSpec.MakeMeasureSpec(MeasuredSizeMask, MeasureSpecMode.AtMost);

        base.OnMeasure(widthMeasureSpec, expandSpec);

        SetMeasuredDimension(MeasuredWidth, (int)2 * MeasuredHeight);
    }

使用 OnDraw:

    protected override void OnDraw(Canvas canvas)
    {
        if (Count != _oldCount)
        {
            _oldCount = Count;
            _params = LayoutParameters;
            _params.Height = CalculateHeight();
            LayoutParameters = _params;
        }

        base.OnDraw(canvas);
    }

CalculateHeight 在哪里:

    private int CalculateHeight()
    {
        var height = 0;
        for (var i = 0; i < ChildCount; i++)
        {
            height += GetChildAt(i).MeasuredHeight;
            height += DividerHeight;
        }
        return height;
    }

甚至:

private int CalculateHeight()
    {
        var mAdapter = Adapter;

        int listviewElementsheight = 0;
        for (int i = 0; i < Adapter.Count; i++)
        {    
            var mView = mAdapter.GetView(i, null, this);

            mView.Measure(MeasureSpec.MakeMeasureSpec(0, MeasureSpecMode.Unspecified),
                MeasureSpec.MakeMeasureSpec(0, MeasureSpecMode.Unspecified));

            listviewElementsheight += mView.MeasuredHeight;
            listviewElementsheight += DividerHeight;
        }
        return listviewElementsheight;
    }

但我注意到元素的高度在任何地方都是相同的。元素有这个布局

<TextView
    android:text="Title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    style="@style/List.Secondary"
    local:MvxBind="Text Title; TextColor FineInfoColor(IsHighlighted)" />
<TextView
    android:text="Content"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    style="@style/List.Primary"
    local:MvxBind="Text Content" />

和第二个 TextView 可以包含一到十行文本。我想这就是问题所在 - 它根据布局而不是实际行高计算高度。我对吗？我该如何解决？

Answer 1

使用 MvxLinearLayout 而不是 MvxListView。