/// <summary>
/// Gets a snapshot that can be used to perform searches. A snapshot is only useful if the buffer content or dimensions have not changed.
/// </summary>
public SearchSnapshot GetSnapshot()
{
if (cache == null)
{
var result = CalculateSnapshot();
cache = result;
}
return(cache);
}
SearchSnapshot CalculateSnapshot(Line [] lines)
{
var result = new SearchSnapshot(lines);
return(result);
}
/// <summary>
/// Invalidates the current search snapshot due to content or size changes.
/// The cache should be invalidated when either the content of the buffer or the buffer dimensions change
/// because the snapshot has direct mappings to buffer line and locations.
/// </summary>
public void Invalidate()
{
// TODO: ideally this would be private and handled completely by the search service and consumers don't have to call this
Invalidated?.Invoke(this, cache?.LastSearch);
cache = null;
}