FastList.Insert C# (CSharp) Method

	public void Insert(int index, T item) {
        if (array == null || size == array.Length) {
            Allocate();
        }
        if (index < size) {
            //move things back 1
            for (int i = size; i > index; i--) {
                array[i] = array[i-1];
            }
            array[index] = item;
            size++;
        }
        else Add(item);
    }

        public override void ApplySizes(BarSizeInfo sizes)
        {
            // if we need additional space in the preBeat group we simply
            // add a new spacer
            var preSize     = sizes.GetSize(KeySizePre);
            var preSizeDiff = preSize - BeatGlyphsStart;

            if (preSizeDiff > 0)
            {
                AddPreBeatGlyph(new SpacingGlyph(0, 0, preSizeDiff));
            }

            // on beat glyphs we apply the glyph spacing
            Std.Foreach(_voiceContainers.Values, c => c.ApplySizes(sizes));

            // on the post glyphs we add the spacing before all other glyphs
            var   postSize = sizes.GetSize(KeySizePost);
            float postSizeDiff;

            if (_postBeatGlyphs.Count == 0)
            {
                postSizeDiff = postSize;
            }
            else
            {
                postSizeDiff = postSize - (_postBeatGlyphs[_postBeatGlyphs.Count - 1].X + _postBeatGlyphs[_postBeatGlyphs.Count - 1].Width);
            }

            if (postSizeDiff > 0)
            {
                _postBeatGlyphs.Insert(0, new SpacingGlyph(0, 0, postSizeDiff));
                for (var i = 0; i < _postBeatGlyphs.Count; i++)
                {
                    var g = _postBeatGlyphs[i];
                    g.X        = i == 0 ? 0 : _postBeatGlyphs[_postBeatGlyphs.Count - 1].X + _postBeatGlyphs[_postBeatGlyphs.Count - 1].Width;
                    g.Index    = i;
                    g.Renderer = this;
                }
            }

            UpdateWidth();
        }