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57 lines
2.5 KiB
C#
57 lines
2.5 KiB
C#
namespace AIStudio.Tools;
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/// <summary>
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/// The shared state of one drop zone scope, meaning one page, one assistant, or one dialog.
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/// </summary>
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/// <remarks>
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/// A scope is the area whose drops end up at its default target whenever the cursor is not over a
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/// more specific zone. That is what users are used to: a file dropped anywhere in the chat hangs
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/// itself on the composer. This object connects the two sides -- the scope cascades it inwards, and
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/// the zone which wants to be the default target claims it here.
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/// </remarks>
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/// <param name="scopeId">The ID of the element the scope renders.</param>
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public sealed class DropZoneScopeState(string scopeId)
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{
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/// <summary>
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/// The ID of the element the scope renders. The hit test reports it for every point inside the
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/// area which no more specific zone covers.
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/// </summary>
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public string ScopeId { get; } = scopeId;
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private object? defaultZone;
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/// <summary>
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/// Makes the given zone the default target of this scope, unless another zone was there first.
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/// </summary>
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/// <remarks>
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/// Zones initialize in render order, so the first one in the markup wins. Two zones asking for
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/// the same area is a mistake in the markup rather than a state worth resolving, and taking the
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/// first one is at least a rule which can be stated and logged. Asking twice is no mistake,
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/// though: a zone whose parameters are set anew has to keep the role it already holds.
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/// </remarks>
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/// <param name="zone">The zone that wants to be the default target.</param>
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/// <returns>True if the zone is the default target of this scope from now on.</returns>
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public bool TryBecomeDefaultZone(object zone)
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{
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if (this.defaultZone is not null && !ReferenceEquals(this.defaultZone, zone))
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return false;
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this.defaultZone = zone;
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return true;
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}
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/// <summary>
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/// Gives the role of the default target up again so that another zone can take it.
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/// </summary>
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/// <remarks>
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/// Every zone that took the role has to do this when it is disposed. Without it, an area would
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/// lose its default target for good as soon as the zone holding it is created anew -- which is
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/// what happens on every navigation and every time a dialog is opened again.
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/// </remarks>
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/// <param name="zone">The zone that gives the role up.</param>
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public void ReleaseDefaultZone(object zone)
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{
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if (ReferenceEquals(this.defaultZone, zone))
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this.defaultZone = null;
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}
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} |