public override void Draw(Gdk.Drawable drawable, Gdk.Rectangle area)
{
TextEditor editor = mode.editor;
int y = editor.LineToVisualY(mode.CurrentInsertionPoint.Line) - (int)editor.VAdjustment.Value;
using (var g = Gdk.CairoHelper.Create(drawable)) {
g.LineWidth = System.Math.Min(1, editor.Options.Zoom);
LineSegment lineAbove = editor.Document.GetLine(mode.CurrentInsertionPoint.Line - 1);
LineSegment lineBelow = editor.Document.GetLine(mode.CurrentInsertionPoint.Line);
int aboveStart = 0, aboveEnd = editor.TextViewMargin.XOffset;
int belowStart = 0, belowEnd = editor.TextViewMargin.XOffset;
int l = 0;
if (lineAbove != null)
{
var wrapper = editor.TextViewMargin.GetLayout(lineAbove);
wrapper.Layout.IndexToLineX(lineAbove.GetIndentation(editor.Document).Length, true, out l, out aboveStart);
aboveStart = (int)(aboveStart / Pango.Scale.PangoScale);
aboveEnd = (int)(wrapper.PangoWidth / Pango.Scale.PangoScale);
if (wrapper.IsUncached)
{
wrapper.Dispose();
}
}
if (lineBelow != null)
{
var wrapper = editor.TextViewMargin.GetLayout(lineBelow);
int index = lineAbove.GetIndentation(editor.Document).Length;
if (index == 0)
{
belowStart = 0;
}
else if (index >= lineBelow.EditableLength)
{
belowStart = wrapper.PangoWidth;
}
else
{
wrapper.Layout.IndexToLineX(index, true, out l, out belowStart);
}
belowStart = (int)(belowStart / Pango.Scale.PangoScale);
belowEnd = (int)(wrapper.PangoWidth / Pango.Scale.PangoScale);
if (wrapper.IsUncached)
{
wrapper.Dispose();
}
}
int d = editor.LineHeight / 3;
int x1 = editor.TextViewMargin.XOffset - (int)editor.HAdjustment.Value;
int x2 = x1;
if (aboveStart < belowEnd)
{
x1 += aboveStart;
x2 += belowEnd;
}
else if (aboveStart > belowEnd)
{
d *= -1;
x1 += belowEnd;
x2 += aboveStart;
}
else
{
x1 += System.Math.Min(aboveStart, belowStart);
x2 += System.Math.Max(aboveEnd, belowEnd);
if (x1 == x2)
{
x2 += 50;
}
}
g.MoveTo(x1, y + d);
g.LineTo(x1, y);
g.LineTo(x2, y);
g.LineTo(x2, y - d);
g.Color = new Cairo.Color(1.0, 0, 0);
g.Stroke();
DrawArrow(g, x1 - 4, y);
}
}
