SizeRequest IPlatform.GetNativeSize(VisualElement element, double widthConstraint, double heightConstraint)
{
// Hack around the fact that Canvas ignores the child constraints.
// It is entirely possible using Canvas as our base class is not wise.
// FIXME: This should not be an if statement. Probably need to define an interface here.
if (widthConstraint > 0 && heightConstraint > 0)
{
IVisualElementRenderer elementRenderer = GetRenderer(element);
if (elementRenderer != null)
{
return(elementRenderer.GetDesiredSize(widthConstraint, heightConstraint));
}
}
return(new SizeRequest());
}
public static SizeRequest GetNativeSize(VisualElement view, double widthConstraint, double heightConstraint)
{
Performance.Start(out string reference);
// FIXME: potential crash
IVisualElementRenderer visualElementRenderer = Android.Platform.GetRenderer(view);
var context = visualElementRenderer.View.Context;
// negative numbers have special meanings to android they don't to us
widthConstraint = widthConstraint <= -1 ? double.PositiveInfinity : context.ToPixels(widthConstraint);
heightConstraint = heightConstraint <= -1 ? double.PositiveInfinity : context.ToPixels(heightConstraint);
bool widthConstrained = !double.IsPositiveInfinity(widthConstraint);
bool heightConstrained = !double.IsPositiveInfinity(heightConstraint);
int widthMeasureSpec = widthConstrained
? MeasureSpecFactory.MakeMeasureSpec((int)widthConstraint, MeasureSpecMode.AtMost)
: MeasureSpecFactory.MakeMeasureSpec(0, MeasureSpecMode.Unspecified);
int heightMeasureSpec = heightConstrained
? MeasureSpecFactory.MakeMeasureSpec((int)heightConstraint, MeasureSpecMode.AtMost)
: MeasureSpecFactory.MakeMeasureSpec(0, MeasureSpecMode.Unspecified);
SizeRequest rawResult = visualElementRenderer.GetDesiredSize(widthMeasureSpec, heightMeasureSpec);
if (rawResult.Minimum == Size.Zero)
{
rawResult.Minimum = rawResult.Request;
}
var result = new SizeRequest(new Size(context.FromPixels(rawResult.Request.Width), context.FromPixels(rawResult.Request.Height)),
new Size(context.FromPixels(rawResult.Minimum.Width), context.FromPixels(rawResult.Minimum.Height)));
if ((widthConstrained && result.Request.Width < widthConstraint) ||
(heightConstrained && result.Request.Height < heightConstraint))
{
// Do a final exact measurement in case the native control needs to fill the container
(visualElementRenderer as IViewRenderer)?.MeasureExactly();
}
Performance.Stop(reference);
return(result);
}
public static SizeRequest GetNativeSize(VisualElement element, double widthConstraint, double heightConstraint)
{
// Hack around the fact that Canvas ignores the child constraints.
// It is entirely possible using Canvas as our base class is not wise.
// FIXME: This should not be an if statement. Probably need to define an interface here.
if (widthConstraint > 0 && heightConstraint > 0)
{
IVisualElementRenderer elementRenderer = GetRenderer(element);
if (elementRenderer != null)
{
return(elementRenderer.GetDesiredSize(widthConstraint, heightConstraint));
}
if (element is IView iView)
{
Application.Current?.FindMauiContext()?.CreateLogger <Platform>()?.LogWarning(
"Someone called Platform.GetNativeSize instead of going through the Handler.");
return(new SizeRequest(iView.Handler.GetDesiredSize(widthConstraint, heightConstraint)));
}
}
return(new SizeRequest());
}