public override void NativeArrange(Rectangle frame)
{
// This is a hack to force the shimmed control to actually do layout; without this, some controls won't actually
// call OnLayout after SetFrame if their sizes haven't changed (e.g., ScrollView)
// Luckily, measuring with MeasureSpecMode.Exactly is pretty fast, since it just returns the value you give it.
NativeView?.Measure(MeasureSpecMode.Exactly.MakeMeasureSpec((int)frame.Width),
MeasureSpecMode.Exactly.MakeMeasureSpec((int)frame.Height));
base.NativeArrange(frame);
}
public override Size GetDesiredSize(double widthConstraint, double heightConstraint)
{
if (NativeView == null || VirtualView == null || Context == null)
{
return(Size.Zero);
}
// Create a spec to handle the native measure
var widthSpec = CreateMeasureSpec(widthConstraint, VirtualView.Width);
var heightSpec = CreateMeasureSpec(heightConstraint, VirtualView.Height);
NativeView.Measure(widthSpec, heightSpec);
// Convert back to xplat sizes for the return value
return(Context.FromPixels(NativeView.MeasuredWidth, NativeView.MeasuredHeight));
}
public override Size GetDesiredSize(double widthConstraint, double heightConstraint)
{
if (NativeView == null || VirtualView == null)
{
return(Size.Zero);
}
if (widthConstraint < 0 || heightConstraint < 0)
{
return(Size.Zero);
}
var measureConstraint = new Windows.Foundation.Size(widthConstraint, heightConstraint);
NativeView.Measure(measureConstraint);
return(new Size(NativeView.DesiredSize.Width, NativeView.DesiredSize.Height));
}
public override Size GetDesiredSize(double widthConstraint, double heightConstraint)
{
if (NativeView == null || VirtualView == null)
{
return(Size.Zero);
}
if (widthConstraint < 0 || heightConstraint < 0)
{
return(Size.Zero);
}
var explicitWidth = VirtualView.Width;
var explicitHeight = VirtualView.Height;
var useExplicitWidth = explicitWidth >= 0;
var useExplicitHeight = explicitHeight >= 0;
if (useExplicitWidth)
{
widthConstraint = Math.Min(VirtualView.Width, widthConstraint);
}
if (useExplicitHeight)
{
heightConstraint = Math.Min(VirtualView.Height, heightConstraint);
}
var measureConstraint = new Windows.Foundation.Size(widthConstraint, heightConstraint);
NativeView.Measure(measureConstraint);
var desiredWidth = NativeView.DesiredSize.Width;
var desiredHeight = NativeView.DesiredSize.Height;
var resultWidth = useExplicitWidth
? Math.Max(desiredWidth, explicitWidth)
: desiredWidth;
var resultHeight = useExplicitHeight
? Math.Max(desiredHeight, explicitHeight)
: desiredHeight;
return(new Size(resultWidth, resultHeight));
}
public void Measure(int widthMeasureSpec, int heightMeasureSpec, int?maxHeightPixels, int?maxWidthPixels)
{
//if (width == -1)
// width = double.PositiveInfinity;
//if (height == -1)
// height = double.PositiveInfinity;
//Width = width;
//Height = height;
//MaxWidth = maxWidth;
//MaxHeight = maxHeight;
//X = x;
//Y = y;
var width = widthMeasureSpec.GetSize();
var height = heightMeasureSpec.GetSize();
var maxWidth = maxWidthPixels;
var maxHeight = maxHeightPixels;
Context context;
if (Handler == null || !(_context.TryGetTarget(out context)) || !NativeView.IsAlive())
{
return;
}
if (View == null)
{
//MauiView.Measure(0, 0);
//MauiView.Arrange(Rectangle.Zero);
return;
}
// NativeView.Measure(widthMeasureSpec, heightMeasureSpec);
var layoutParams = NativeView.LayoutParameters;
//if (double.IsInfinity(height))
// height = request.Height;
//if (double.IsInfinity(width))
// width = request.Width;
if (height > maxHeight)
{
heightMeasureSpec = MeasureSpecMode.AtMost.MakeMeasureSpec(maxHeight.Value);
}
if (width > maxWidth)
{
widthMeasureSpec = MeasureSpecMode.AtMost.MakeMeasureSpec(maxWidth.Value);
}
if (layoutParams.Width != LP.MatchParent && width > 0)
{
layoutParams.Width = width;
}
else
{
widthMeasureSpec = MeasureSpecMode.Unspecified.MakeMeasureSpec(0);
}
if (layoutParams.Height != LP.MatchParent && height > 0)
{
layoutParams.Height = height;
}
else
{
heightMeasureSpec = MeasureSpecMode.Unspecified.MakeMeasureSpec(0);
}
NativeView.LayoutParameters = layoutParams;
//var c = NativeView.Context;
//var l = (int)c.ToPixels(x);
//var t = (int)c.ToPixels(y);
//var r = (int)c.ToPixels(width) + l;
//var b = (int)c.ToPixels(height) + t;
//NativeView.Layout(l, t, r, b);
NativeView.Measure(widthMeasureSpec, heightMeasureSpec);
}