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using System;
using System.Diagnostics;
using System.Linq;
using Android.Content;
using Android.Graphics;
namespace Xamarin.Forms.Platform.Android
{
internal static class CarouselViewExtensions
{
internal static int Area(this System.Drawing.Rectangle rectangle)
{
return rectangle.Width * rectangle.Height;
}
internal static IntVector BoundTranslation(this System.Drawing.Rectangle viewport, IntVector delta, System.Drawing.Rectangle bound)
{
// TODO: generalize the math
Debug.Assert(delta.X == 0 || delta.Y == 0);
IntVector start = viewport.LeadingCorner(delta);
IntVector end = start + delta;
IntVector clampedEnd = end.Clamp(bound);
IntVector clampedDelta = clampedEnd - start;
return clampedDelta;
}
internal static IntVector Center(this System.Drawing.Rectangle rectangle)
{
return (IntVector)rectangle.Location + (IntVector)rectangle.Size / 2;
}
internal static IntVector Clamp(this IntVector position, System.Drawing.Rectangle bound)
{
return new IntVector(position.X.Clamp(bound.Left, bound.Right), position.Y.Clamp(bound.Top, bound.Bottom));
}
internal static IntVector LeadingCorner(this System.Drawing.Rectangle rectangle, IntVector delta)
{
return new IntVector(delta.X < 0 ? rectangle.Left : rectangle.Right, delta.Y < 0 ? rectangle.Top : rectangle.Bottom);
}
internal static bool LexicographicallyLess(this System.Drawing.Point source, System.Drawing.Point target)
{
if (source.X < target.X)
return true;
if (source.X > target.X)
return false;
return source.Y < target.Y;
}
internal static Rect ToAndroidRectangle(this System.Drawing.Rectangle rectangle)
{
return new Rect(rectangle.Left, right: rectangle.Right, top: rectangle.Top, bottom: rectangle.Bottom);
}
internal static Rectangle ToFormsRectangle(this System.Drawing.Rectangle rectangle, Context context)
{
return new Rectangle(context.FromPixels(rectangle.Left), context.FromPixels(rectangle.Top), context.FromPixels(rectangle.Width), context.FromPixels(rectangle.Height));
}
internal static int[] ToRange(this Tuple<int, int> startAndCount)
{
return Enumerable.Range(startAndCount.Item1, startAndCount.Item2).ToArray();
}
}
}
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