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osu-lazer/osu.Game/Rulesets/UI/ScalableContainer.cs

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2018-04-13 17:19:50 +08:00
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using OpenTK;
namespace osu.Game.Rulesets.UI
{
/// <summary>
/// A <see cref="Container"/> which can have its internal coordinate system scaled to a specific size.
/// </summary>
public class ScalableContainer : Container
{
/// <summary>
/// A function that converts coordinates from gamefield to screen space.
/// </summary>
public Func<Vector2, Vector2> GamefieldToScreenSpace => scaledContent.GamefieldToScreenSpace;
/// <summary>
/// The scaled content.
/// </summary>
private readonly ScaledContainer scaledContent;
protected override Container<Drawable> Content => scaledContent;
/// <summary>
/// A <see cref="Container"/> which can have its internal coordinate system scaled to a specific size.
/// </summary>
/// <param name="customWidth">The width to scale the internal coordinate space to.
/// May be null if scaling based on <paramref name="customHeight"/> is desired. If <paramref name="customHeight"/> is also null, no scaling will occur.
/// </param>
/// <param name="customHeight">The height to scale the internal coordinate space to.
/// May be null if scaling based on <paramref name="customWidth"/> is desired. If <paramref name="customWidth"/> is also null, no scaling will occur.
/// </param>
public ScalableContainer(float? customWidth = null, float? customHeight = null)
{
AddInternal(scaledContent = new ScaledContainer
{
CustomWidth = customWidth,
CustomHeight = customHeight,
RelativeSizeAxes = Axes.Both,
});
}
private class ScaledContainer : Container
{
/// <summary>
/// A function that converts coordinates from gamefield to screen space.
/// </summary>
public Func<Vector2, Vector2> GamefieldToScreenSpace => content.ToScreenSpace;
/// <summary>
/// The value to scale the width of the content to match.
/// If null, <see cref="CustomHeight"/> is used.
/// </summary>
public float? CustomWidth;
/// <summary>
/// The value to scale the height of the content to match.
/// if null, <see cref="CustomWidth"/> is used.
/// </summary>
public float? CustomHeight;
private readonly Container content;
protected override Container<Drawable> Content => content;
public ScaledContainer()
{
AddInternal(content = new Container { RelativeSizeAxes = Axes.Both });
}
protected override void Update()
{
base.Update();
content.Scale = sizeScale;
content.Size = Vector2.Divide(Vector2.One, sizeScale);
}
/// <summary>
/// The scale that is required for the size of the content to match <see cref="CustomWidth"/> and <see cref="CustomHeight"/>.
/// </summary>
private Vector2 sizeScale
{
get
{
if (CustomWidth.HasValue && CustomHeight.HasValue)
return Vector2.Divide(DrawSize, new Vector2(CustomWidth.Value, CustomHeight.Value));
if (CustomWidth.HasValue)
return new Vector2(DrawSize.X / CustomWidth.Value);
if (CustomHeight.HasValue)
return new Vector2(DrawSize.Y / CustomHeight.Value);
return Vector2.One;
}
}
}
}
}