47 lines
2.2 KiB
C#
47 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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namespace AcDream.App.UI;
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/// <summary>
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/// A toolbar-frame variant that snaps its height between two stops — collapsed (row 2 hidden) and
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/// expanded (row 2 shown) — and toggles a set of "second-row" elements to match. Resized via the
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/// bottom edge (the mount sets <see cref="UiElement.ResizableEdges"/> = Bottom); each tick it resolves
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/// the dragged height to the nearer stop so the frame always rests collapsed or expanded — never a
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/// half-row. Toolkit UX (keystone.dll has no decomp; the dat stacks both rows always) — see IA-17.
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/// </summary>
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public sealed class UiCollapsibleFrame : UiNineSlicePanel, IRetainedWindowStateController
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{
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public UiCollapsibleFrame(Func<uint, (uint, int, int)> resolve) : base(resolve) { }
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public float CollapsedHeight { get; set; }
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public float ExpandedHeight { get; set; }
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/// <summary>Elements shown only when expanded (the row-2 slot lists). Hidden when collapsed.</summary>
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public IReadOnlyList<UiElement> SecondRow { get; set; } = Array.Empty<UiElement>();
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/// <summary>True when the frame is at (or nearer) the expanded stop.</summary>
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public bool IsExpanded => Height >= (CollapsedHeight + ExpandedHeight) * 0.5f;
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protected override void OnTick(double deltaSeconds)
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{
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base.OnTick(deltaSeconds);
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if (ExpandedHeight <= CollapsedHeight) return; // not configured yet — no snap
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bool expanded = IsExpanded;
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Height = expanded ? ExpandedHeight : CollapsedHeight; // snap the dragged height to a stop
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for (int i = 0; i < SecondRow.Count; i++) SecondRow[i].Visible = expanded;
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}
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/// <summary>Test hook — OnTick is protected. Drives one snap+visibility reconcile.</summary>
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internal void TickForTest(double dt) => OnTick(dt);
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public RetainedWindowState CaptureWindowState()
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=> new(Collapsed: !IsExpanded);
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public void RestoreWindowState(RetainedWindowState state)
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{
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if (ExpandedHeight <= CollapsedHeight) return;
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Height = state.Collapsed ? CollapsedHeight : ExpandedHeight;
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for (int i = 0; i < SecondRow.Count; i++)
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SecondRow[i].Visible = !state.Collapsed;
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}
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}
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