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210 lines
6.6 KiB
C#
210 lines
6.6 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.Linq;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Containers;
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namespace osu.Game.Graphics.Containers
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{
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/// <summary>
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/// A container that can scroll to each section inside it.
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/// </summary>
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public class SectionsContainer<T> : Container<T>
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where T : Drawable
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{
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private Drawable expandableHeader, fixedHeader, footer, headerBackground;
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private readonly OsuScrollContainer scrollContainer;
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private readonly Container headerBackgroundContainer;
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private readonly FlowContainer<T> scrollContentContainer;
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protected override Container<T> Content => scrollContentContainer;
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public Drawable ExpandableHeader
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{
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get => expandableHeader;
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set
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{
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if (value == expandableHeader) return;
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expandableHeader?.Expire();
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expandableHeader = value;
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if (value == null) return;
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AddInternal(expandableHeader);
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lastKnownScroll = float.NaN;
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}
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}
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public Drawable FixedHeader
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{
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get => fixedHeader;
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set
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{
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if (value == fixedHeader) return;
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fixedHeader?.Expire();
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fixedHeader = value;
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if (value == null) return;
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AddInternal(fixedHeader);
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lastKnownScroll = float.NaN;
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}
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}
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public Drawable Footer
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{
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get => footer;
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set
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{
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if (value == footer) return;
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if (footer != null)
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scrollContainer.Remove(footer);
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footer = value;
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if (value == null) return;
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footer.Anchor |= Anchor.y2;
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footer.Origin |= Anchor.y2;
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scrollContainer.Add(footer);
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lastKnownScroll = float.NaN;
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}
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}
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public Drawable HeaderBackground
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{
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get => headerBackground;
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set
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{
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if (value == headerBackground) return;
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headerBackgroundContainer.Clear();
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headerBackground = value;
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if (value == null) return;
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headerBackgroundContainer.Add(headerBackground);
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lastKnownScroll = float.NaN;
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}
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}
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public Bindable<T> SelectedSection { get; } = new Bindable<T>();
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protected virtual FlowContainer<T> CreateScrollContentContainer()
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=> new FillFlowContainer<T>
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{
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Direction = FillDirection.Vertical,
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AutoSizeAxes = Axes.Y,
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RelativeSizeAxes = Axes.X,
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};
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public override void Add(T drawable)
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{
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base.Add(drawable);
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lastKnownScroll = float.NaN;
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headerHeight = float.NaN;
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footerHeight = float.NaN;
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}
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private float headerHeight, footerHeight;
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private readonly MarginPadding originalSectionsMargin;
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private void updateSectionsMargin()
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{
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if (!Children.Any()) return;
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var newMargin = originalSectionsMargin;
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newMargin.Top += headerHeight;
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newMargin.Bottom += footerHeight;
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scrollContentContainer.Margin = newMargin;
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}
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public SectionsContainer()
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{
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AddInternal(scrollContainer = new OsuScrollContainer
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{
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RelativeSizeAxes = Axes.Both,
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Masking = true,
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ScrollbarVisible = false,
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Children = new Drawable[] { scrollContentContainer = CreateScrollContentContainer() }
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});
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AddInternal(headerBackgroundContainer = new Container
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{
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RelativeSizeAxes = Axes.X
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});
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originalSectionsMargin = scrollContentContainer.Margin;
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}
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public void ScrollTo(Drawable section) => scrollContainer.ScrollTo(scrollContainer.GetChildPosInContent(section) - (FixedHeader?.BoundingBox.Height ?? 0));
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public void ScrollToTop() => scrollContainer.ScrollTo(0);
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public override void InvalidateFromChild(Invalidation invalidation, Drawable source = null)
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{
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base.InvalidateFromChild(invalidation, source);
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if ((invalidation & Invalidation.DrawSize) != 0)
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{
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if (source == ExpandableHeader) //We need to recalculate the positions if the ExpandableHeader changed its size
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lastKnownScroll = -1;
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}
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}
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private float lastKnownScroll;
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protected override void UpdateAfterChildren()
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{
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base.UpdateAfterChildren();
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float headerH = (ExpandableHeader?.LayoutSize.Y ?? 0) + (FixedHeader?.LayoutSize.Y ?? 0);
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float footerH = Footer?.LayoutSize.Y ?? 0;
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if (headerH != headerHeight || footerH != footerHeight)
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{
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headerHeight = headerH;
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footerHeight = footerH;
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updateSectionsMargin();
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}
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float currentScroll = scrollContainer.Current;
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if (currentScroll != lastKnownScroll)
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{
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lastKnownScroll = currentScroll;
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if (ExpandableHeader != null && FixedHeader != null)
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{
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float offset = Math.Min(ExpandableHeader.LayoutSize.Y, currentScroll);
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ExpandableHeader.Y = -offset;
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FixedHeader.Y = -offset + ExpandableHeader.LayoutSize.Y;
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}
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headerBackgroundContainer.Height = (ExpandableHeader?.LayoutSize.Y ?? 0) + (FixedHeader?.LayoutSize.Y ?? 0);
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headerBackgroundContainer.Y = ExpandableHeader?.Y ?? 0;
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T bestMatch = null;
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float minDiff = float.MaxValue;
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float scrollOffset = FixedHeader?.LayoutSize.Y ?? 0;
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foreach (var section in Children)
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{
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float diff = Math.Abs(scrollContainer.GetChildPosInContent(section) - currentScroll - scrollOffset);
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if (diff < minDiff)
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{
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minDiff = diff;
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bestMatch = section;
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}
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}
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if (bestMatch != null)
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SelectedSection.Value = bestMatch;
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}
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}
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}
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}
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