/// <summary>
/// Adds an appropriately sized highlight box for the range of characters on the given line.
/// Does not take into account text clipping or text offset.
/// </summary>
private void AddHighlightBox(int line, int startCh, int endCh)
{
if (text[line].Count > 0)
{
if (startCh < 0 || endCh < 0 || startCh >= text[line].Count || endCh >= text[line].Count)
{
throw new Exception($"Char out of range. Line: {line} StartCh: {startCh}, EndCh: {endCh}, Count: {text[line].Count}");
}
IRichChar left = text[line][startCh], right = text[line][endCh];
var highlightBox = new HighlightBox
{
size = new Vector2()
{
X = right.Offset.X - left.Offset.X + (left.Size.X + right.Size.X) * .5f,
Y = text[line].Size.Y
},
offset = new Vector2()
{
X = (right.Offset.X + left.Offset.X) * .5f - 2f,
Y = text[line].VerticalOffset - text[line].Size.Y * .5f
}
};
if (highlightBox.size.X > 1f)
{
highlightBox.size.X += 4f;
}
highlightList.Add(highlightBox);
}
}
protected override void Draw()
{
if (ShowCaret)
{
bool isCharVisible = text.Count == 0 || text[0].Count == 0;
CaretIndex = ClampIndex(CaretIndex);
// If line visible
if ((text.Count > 0 && text[0].Count > 0) &&
(CaretIndex.X >= text.VisibleLineRange.X && CaretIndex.X <= text.VisibleLineRange.Y))
{
// Damned special cases
Vector2I index = Vector2I.Max(CaretIndex, Vector2I.Zero);
// Calculate visibilty on line
IRichChar ch = text[index];
Vector2 size = ch.Size,
pos = ch.Offset + text.TextOffset;
BoundingBox2 textBounds = BoundingBox2.CreateFromHalfExtent(Vector2.Zero, .5f * text.Size),
charBounds = BoundingBox2.CreateFromHalfExtent(pos, .5f * Vector2.Max(size, new Vector2(8f)));
if (textBounds.Contains(charBounds) != ContainmentType.Disjoint)
{
isCharVisible = true;
}
}
if (blink & isCharVisible)
{
UpdateOffset();
base.Draw();
}
if (blinkTimer.ElapsedMilliseconds > 500)
{
blink = !blink;
blinkTimer.Restart();
}
}
}