public void UpdateLocation(int x, int y, int height, CaretSetting mode)
{
if (IsFinal)
{
throw new InvalidOperationException("CaretPosition is already finalised");
}
CaretLocation loc = new CaretLocation(x, y, height);
switch (mode)
{
case CaretSetting.Absolute:
primary = loc;
secondary = null;
break;
case CaretSetting.Accurate:
primary = loc;
break;
case CaretSetting.Fallback:
secondary = loc;
break;
}
}
public override void GetCaretPosition(IGraphics gr, int x, int y, SelectionPoint sp, ref CaretPositionInfo cpi)
{
// TODO: M: this is very innefficient since it is called for all text nodes during search
if (!ContainsSelectionPoint(sp))
{
cpi.UpdateLocation(x + Width, y, Height, CaretSetting.Fallback);
return;
}
TextSelectionPoint tsp = (TextSelectionPoint)sp;
CaretSetting mode = CaretSetting.Absolute;
gr.PushFont(gr.GetFontHandle(style.FontDesc));
try
{
int n = tsp.Index - start;
if (n < 0)
{
// position is not in visible part of the string, it's
// in whitespace that has been trimmed.
cpi.UseSecondary = true;
return;
}
else if (tsp.Index == 0)
{
// caret can be put somewhere else if necessary
// TODO: L: this is a bit simplistic - will be wrong if text nodes are
// split and first node ends with space and ends a line (!)
mode = CaretSetting.Accurate;
}
string text = Text;
if (n > text.Length)
{
// TODO: L: not sure exactly when this happens
n = text.Length;
}
text = ProcessText(text.Substring(0, n));
int w = gr.MeasureText(text).Width;
cpi.UpdateLocation(x + w, y, Height, mode);
}
finally
{
gr.PopFont();
}
}