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BlockNavigation.cs
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164 lines (136 loc) · 4.29 KB
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using System;
using System.Collections.Generic;
using CommunityToolkit.Mvvm.ComponentModel;
namespace SourceGit.ViewModels
{
public enum BlockNavigationDirection
{
First = 0,
Prev,
Next,
Last
}
public class BlockNavigation : ObservableObject
{
public record Block(int Start, int End)
{
public bool Contains(int line)
{
return line >= Start && line <= End;
}
}
public string Indicator
{
get
{
if (_blocks.Count == 0)
return "-/-";
if (_current >= 0 && _current < _blocks.Count)
return $"{_current + 1}/{_blocks.Count}";
return $"-/{_blocks.Count}";
}
}
public BlockNavigation(List<Models.TextDiffLine> lines, int cur)
{
_blocks.Clear();
if (lines.Count == 0)
{
_current = -1;
return;
}
var lineIdx = 0;
var blockStartIdx = 0;
var isReadingBlock = false;
var blocks = new List<Block>();
foreach (var line in lines)
{
lineIdx++;
if (line.Type is Models.TextDiffLineType.Added or Models.TextDiffLineType.Deleted or Models.TextDiffLineType.None)
{
if (!isReadingBlock)
{
isReadingBlock = true;
blockStartIdx = lineIdx;
}
}
else
{
if (isReadingBlock)
{
blocks.Add(new Block(blockStartIdx, lineIdx - 1));
isReadingBlock = false;
}
}
}
if (isReadingBlock)
blocks.Add(new Block(blockStartIdx, lines.Count));
_blocks.AddRange(blocks);
_current = Math.Min(_blocks.Count - 1, cur);
}
public int GetCurrentBlockIndex()
{
return _current;
}
public Block GetCurrentBlock()
{
if (_current >= 0 && _current < _blocks.Count)
return _blocks[_current];
return null;
}
public Block Goto(BlockNavigationDirection direction)
{
if (_blocks.Count == 0)
return null;
_current = direction switch
{
BlockNavigationDirection.First => 0,
BlockNavigationDirection.Prev => _current <= 0 ? 0 : _current - 1,
BlockNavigationDirection.Next => _current >= _blocks.Count - 1 ? _blocks.Count - 1 : _current + 1,
BlockNavigationDirection.Last => _blocks.Count - 1,
_ => _current
};
OnPropertyChanged(nameof(Indicator));
return _blocks[_current];
}
public void UpdateByChunk(TextDiffSelectedChunk chunk)
{
_current = -1;
var chunkStart = chunk.StartIdx + 1;
var chunkEnd = chunk.EndIdx + 1;
for (var i = 0; i < _blocks.Count; i++)
{
var block = _blocks[i];
if (chunkStart > block.End)
continue;
if (chunkEnd < block.Start)
{
_current = i - 1;
break;
}
_current = i;
}
}
public void UpdateByCaretPosition(int caretLine)
{
if (_current >= 0 && _current < _blocks.Count)
{
var block = _blocks[_current];
if (block.Contains(caretLine))
return;
}
_current = -1;
for (var i = 0; i < _blocks.Count; i++)
{
var block = _blocks[i];
if (block.Start > caretLine)
break;
_current = i;
if (block.End >= caretLine)
break;
}
OnPropertyChanged(nameof(Indicator));
}
private int _current;
private readonly List<Block> _blocks = [];
}
}