public void TestIsVisible()
//https://github.com/xamarin/Microsoft.Maui.Controls/issues/2593
{
var label0 = new Label
{
IsPlatformEnabled = true,
};
var label1 = new Label
{
IsPlatformEnabled = true,
};
var label2 = new Label
{
IsPlatformEnabled = true,
};
var layout = new FlexLayout
{
IsPlatformEnabled = true,
Direction = FlexDirection.Column,
Children =
{
label0,
label1,
label2,
}
};
var handler = Substitute.For <IViewHandler>();
layout.Handler = handler;
layout.Layout(new Rect(0, 0, 300, 300));
Assert.That(label0.Bounds, Is.EqualTo(new Rect(0, 0, 300, 20)));
Assert.That(label1.Bounds, Is.EqualTo(new Rect(0, 20, 300, 20)));
Assert.That(label2.Bounds, Is.EqualTo(new Rect(0, 40, 300, 20)));
label1.IsVisible = false;
// Changing the visibility of the label should have triggered a measure invalidation in the layout
AssertInvalidated(handler);
// Fake a native invalidation
layout.ForceLayout();
Assert.That(label0.Bounds, Is.EqualTo(new Rect(0, 0, 300, 20)));
Assert.That(label2.Bounds, Is.EqualTo(new Rect(0, 20, 300, 20)));
label0.IsVisible = false;
label1.IsVisible = true;
// Verify the visibility changes invalidated the layout
AssertInvalidated(handler);
// Fake a native invalidation
layout.ForceLayout();
Assert.That(label1.Bounds, Is.EqualTo(new Rect(0, 0, 300, 20)));
Assert.That(label2.Bounds, Is.EqualTo(new Rect(0, 20, 300, 20)));
}
public void ChangingGrowTriggersLayout()
//https://github.com/xamarin/Microsoft.Maui.Controls/issues/2821
{
var layout = new FlexLayout
{
IsPlatformEnabled = true,
Direction = FlexDirection.Column,
};
var handler = Substitute.For <IViewHandler>();
layout.Handler = handler;
layout.Layout(new Rect(0, 0, 300, 300));
for (var i = 0; i < 3; i++)
{
var box = new BoxView
{
IsPlatformEnabled = true,
};
layout.Children.Add(box);
FlexLayout.SetGrow(box, 1f);
}
// Verify the changes invalidated the layout
AssertInvalidated(handler);
// Fake a native invalidation
layout.ForceLayout();
Assert.That(layout.Children[2].Frame, Is.EqualTo(new Rect(0, 200, 300, 100)));
}