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osu-lazer/osu.Game/Screens/Edit/Compose/Components/PositionSnapGrid.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;
using osu.Framework.Layout;
using osuTK;
namespace osu.Game.Screens.Edit.Compose.Components
{
public abstract partial class PositionSnapGrid : CompositeDrawable
{
/// <summary>
/// The position of the origin of this <see cref="PositionSnapGrid"/> in local coordinates.
/// </summary>
public Bindable<Vector2> StartPosition { get; } = new Bindable<Vector2>(Vector2.Zero);
protected readonly LayoutValue GridCache = new LayoutValue(Invalidation.RequiredParentSizeToFit);
protected PositionSnapGrid()
{
StartPosition.BindValueChanged(_ => GridCache.Invalidate());
AddLayout(GridCache);
}
protected override void Update()
{
base.Update();
if (GridCache.IsValid) return;
ClearInternal();
if (DrawWidth > 0 && DrawHeight > 0)
CreateContent();
GridCache.Validate();
}
protected abstract void CreateContent();
protected void GenerateOutline(Vector2 drawSize)
{
// Make lines the same width independent of display resolution.
float lineWidth = DrawWidth / ScreenSpaceDrawQuad.Width;
AddRangeInternal(new[]
{
new Box
{
Colour = Colour4.White,
Alpha = 0.3f,
Origin = Anchor.CentreLeft,
RelativeSizeAxes = Axes.X,
Height = lineWidth,
Y = 0,
},
new Box
{
Colour = Colour4.White,
Alpha = 0.3f,
Origin = Anchor.CentreLeft,
RelativeSizeAxes = Axes.X,
Height = lineWidth,
Y = drawSize.Y,
},
new Box
{
Colour = Colour4.White,
Alpha = 0.3f,
Origin = Anchor.TopCentre,
RelativeSizeAxes = Axes.Y,
Width = lineWidth,
X = 0,
},
new Box
{
Colour = Colour4.White,
Alpha = 0.3f,
Origin = Anchor.TopCentre,
RelativeSizeAxes = Axes.Y,
Width = lineWidth,
X = drawSize.X,
},
});
}
public abstract Vector2 GetSnappedPosition(Vector2 original);
}
}