osu/osu.Game/Graphics/Containers/SectionsContainer.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.
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using System;
using System.Linq;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
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using osu.Framework.Layout;
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namespace osu.Game.Graphics.Containers
{
/// <summary>
/// A container that can scroll to each section inside it.
/// </summary>
public class SectionsContainer<T> : Container<T>
where T : Drawable
{
private Drawable expandableHeader, fixedHeader, footer, headerBackground;
private readonly OsuScrollContainer scrollContainer;
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private readonly Container headerBackgroundContainer;
private readonly FlowContainer<T> scrollContentContainer;
protected override Container<T> Content => scrollContentContainer;
public Drawable ExpandableHeader
{
get => expandableHeader;
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set
{
if (value == expandableHeader) return;
expandableHeader?.Expire();
expandableHeader = value;
if (value == null) return;
AddInternal(expandableHeader);
lastKnownScroll = float.NaN;
}
}
public Drawable FixedHeader
{
get => fixedHeader;
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set
{
if (value == fixedHeader) return;
fixedHeader?.Expire();
fixedHeader = value;
if (value == null) return;
AddInternal(fixedHeader);
lastKnownScroll = float.NaN;
}
}
public Drawable Footer
{
get => footer;
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set
{
if (value == footer) return;
if (footer != null)
scrollContainer.Remove(footer);
footer = value;
if (value == null) return;
footer.Anchor |= Anchor.y2;
footer.Origin |= Anchor.y2;
scrollContainer.Add(footer);
lastKnownScroll = float.NaN;
}
}
public Drawable HeaderBackground
{
get => headerBackground;
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set
{
if (value == headerBackground) return;
headerBackgroundContainer.Clear();
headerBackground = value;
if (value == null) return;
headerBackgroundContainer.Add(headerBackground);
lastKnownScroll = float.NaN;
}
}
public Bindable<T> SelectedSection { get; } = new Bindable<T>();
protected virtual FlowContainer<T> CreateScrollContentContainer()
=> new FillFlowContainer<T>
{
Direction = FillDirection.Vertical,
AutoSizeAxes = Axes.Y,
RelativeSizeAxes = Axes.X,
};
public override void Add(T drawable)
{
base.Add(drawable);
lastKnownScroll = float.NaN;
headerHeight = float.NaN;
footerHeight = float.NaN;
}
private float headerHeight, footerHeight;
private readonly MarginPadding originalSectionsMargin;
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private void updateSectionsMargin()
{
if (!Children.Any()) return;
var newMargin = originalSectionsMargin;
newMargin.Top += headerHeight;
newMargin.Bottom += footerHeight;
scrollContentContainer.Margin = newMargin;
}
public SectionsContainer()
{
AddInternal(scrollContainer = new OsuScrollContainer
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{
RelativeSizeAxes = Axes.Both,
Masking = true,
ScrollbarVisible = false,
Children = new Drawable[] { scrollContentContainer = CreateScrollContentContainer() }
});
AddInternal(headerBackgroundContainer = new Container
{
RelativeSizeAxes = Axes.X
});
originalSectionsMargin = scrollContentContainer.Margin;
}
public void ScrollTo(Drawable section) => scrollContainer.ScrollTo(scrollContainer.GetChildPosInContent(section) - (FixedHeader?.BoundingBox.Height ?? 0));
public void ScrollToTop() => scrollContainer.ScrollTo(0);
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protected override bool OnInvalidate(Invalidation invalidation, InvalidationSource source)
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{
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var result = base.OnInvalidate(invalidation, source);
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if (source == InvalidationSource.Child && (invalidation & Invalidation.DrawSize) != 0)
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{
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lastKnownScroll = -1;
result = true;
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}
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return result;
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}
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private float lastKnownScroll;
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protected override void UpdateAfterChildren()
{
base.UpdateAfterChildren();
float headerH = (ExpandableHeader?.LayoutSize.Y ?? 0) + (FixedHeader?.LayoutSize.Y ?? 0);
float footerH = Footer?.LayoutSize.Y ?? 0;
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if (headerH != headerHeight || footerH != footerHeight)
{
headerHeight = headerH;
footerHeight = footerH;
updateSectionsMargin();
}
float currentScroll = scrollContainer.Current;
if (currentScroll != lastKnownScroll)
{
lastKnownScroll = currentScroll;
if (ExpandableHeader != null && FixedHeader != null)
{
float offset = Math.Min(ExpandableHeader.LayoutSize.Y, currentScroll);
ExpandableHeader.Y = -offset;
FixedHeader.Y = -offset + ExpandableHeader.LayoutSize.Y;
}
headerBackgroundContainer.Height = (ExpandableHeader?.LayoutSize.Y ?? 0) + (FixedHeader?.LayoutSize.Y ?? 0);
headerBackgroundContainer.Y = ExpandableHeader?.Y ?? 0;
T bestMatch = null;
float minDiff = float.MaxValue;
float scrollOffset = FixedHeader?.LayoutSize.Y ?? 0;
foreach (var section in Children)
{
float diff = Math.Abs(scrollContainer.GetChildPosInContent(section) - currentScroll - scrollOffset);
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if (diff < minDiff)
{
minDiff = diff;
bestMatch = section;
}
}
if (bestMatch != null)
SelectedSection.Value = bestMatch;
}
}
}
}