JonKazama-Hellion
c4c85cf4b8
- Translated project documentation (LEARNING-JOURNEY, CONTRIBUTORS, AI_DISCLOSURE) to English for better accessibility. - Standardized internal code documentation by converting XML-doc blocks to standard comment format. - Cleaned up inline comments and removed redundant versioning metadata across the codebase. - Refactored non-functional text elements to improve readability and maintain a consistent style.
75 lines
2.2 KiB
C#
75 lines
2.2 KiB
C#
using System;
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namespace HellionChat._Helpers;
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// Extracted history-navigation cursor math from CompactCallback to allow unit
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// testing without ImGuiInputTextCallbackData (DeleteChars/InsertChars).
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// Buffer mutation stays at the call site; only the cursor/replacement decision lives here.
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//
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// Index semantics match InputHistoryService:
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// index 0 = oldest entry
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// index Count-1 = newest entry
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// cursor == -1 = not browsing history
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//
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// replacement == null: caller must NOT touch the buffer (cursor unchanged).
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// replacement != null: write it to the buffer (including "" to clear it).
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//
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// TEST-MIRROR: ../../../Hellion Build test/Ui/CompactInputHistoryNavigatorTests.cs
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public static class CompactInputHistoryNavigator
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{
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public enum Direction
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{
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Up,
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Down,
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}
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public static (int cursor, string? replacement) Navigate(
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Direction direction,
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int currentCursor,
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string currentBuffer,
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Func<int> getCount,
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Action<string> push,
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Func<int, string?> getByCursor
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)
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{
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ArgumentNullException.ThrowIfNull(getCount);
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ArgumentNullException.ThrowIfNull(push);
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ArgumentNullException.ThrowIfNull(getByCursor);
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var next = currentCursor;
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switch (direction)
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{
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case Direction.Up:
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if (currentCursor == -1)
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{
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// Stash current input so the user can recover it after browsing.
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var offset = 0;
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if (!string.IsNullOrWhiteSpace(currentBuffer))
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{
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push(currentBuffer);
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offset = 1;
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}
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next = getCount() - 1 - offset;
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}
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else if (currentCursor > 0)
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next--;
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break;
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case Direction.Down:
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if (currentCursor != -1)
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{
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next++;
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if (next >= getCount())
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next = -1;
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}
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break;
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}
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if (next == currentCursor)
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return (next, null);
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return (next, getByCursor(next) ?? string.Empty);
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}
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}
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