Custom layout base on AbsoluteLayout will repeated measure many times

[xtuzy]

Description

I try to custom layout, it name ConstraintLayout.
First, i let it derive from Layout like AbsoluteLayout, but nothing show, i don't why.
Then, i ask help form Stackoverflow,see problem, someone say it need derive from AbsoluteLayout, so i change my code, see the changed result ConstraintLayout.Maui.cs, you can see the change.

When use AbsoluteLayout as base class, all control can show, but it will measure many times, when no control in ConstraintLayout, it need measure 6 times at start.

when two control in ConstraintLayout, it need measure many times.

I have made ConstraintLayout of WinUI, it just need 2 times at start.

I want know,

1. how to use Layout, ILayout, LayoutManager,ILayoutManager to custom layout, someone say need use handler, but i don't need extra platform code, why also need use it, i search maui source code don't find AbsoluteLayoutHandler. what i miss?

Steps to Reproduce

1. Run https://github.com/xtuzy/SharpConstraintLayout/tree/Modify

Version with bug

Release Candidate 3 (current)

Last version that worked well

Unknown/Other

Affected platforms

Windows, I was not able test on other platforms

Affected platform versions

Windows SDK 10.0.22000

Did you find any workaround?

No response

Relevant log output

No response

[hartez]

#7039 and #7049 may have fixed this. Noting it here so I can check.

[xtuzy]

I want die. Finally i found i just use incorrect Arrange method, View inherit form VisualElement and IView, they all have a Arrange method, i use it of VisualElement, so all control not show.

[xtuzy]

I write a simple customlayout, it also need measure 5 times

        static int index = 0;
        public override Size Measure(double widthConstraint, double heightConstraint)
        {
            Debug.WriteLine("Measure Times:" + index++);
            var availableSize = new Size(widthConstraint, heightConstraint);
            foreach (var child in (Layout as Layout).Children)
            {
                var childSize = child.Measure(widthConstraint, heightConstraint);
            }
            return availableSize;
        }

        public override Size ArrangeChildren(Rect bounds)
        {
            foreach (var child in (Layout as Layout).Children)
            {
                child.Arrange(new Rect(bounds.X + bounds.Width / 2, bounds.Y + bounds.Height / 2, child.DesiredSize.Width, child.DesiredSize.Height));
            }
            return bounds.Size;
        }

[xtuzy]

Today update to rc3, this problem have solved.