private float MeasureLineHeight(LineSpan line)
{
float height = 0.0F;
foreach (var span in line.TextSpans)
{
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
height = Math.Max(
height,
font.Height + styleStack.GetNumber(s => s.PaddingTop) +
styleStack.GetNumber(s => s.PaddingBottom));
styleStack.PopStyle();
}
return(height);
}
private RectangleF CharPositionToClient(Graphics g, TextPointer pos, LayoutSpan span, StyleStack styleStack)
{
var iChar = pos.Character;
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
var textStub = span.Text.Substring(0, iChar);
var sz = MeasureText(g, textStub, font);
var x = sz.Width + span.ContentExtent.Left;
var width = 1;
styleStack.PopStyle();
return(new RectangleF(x, span.ContentExtent.Top, width, span.ContentExtent.Height));
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (Capture && !dragging)
{
// We're extending the selection
var pos = ClientToLogicalPosition(e.Location);
if (layout.ComparePositions(cursorPos, pos) != 0)
{
this.cursorPos = pos;
Invalidate();
}
}
else
{
// Not captured, so rat is just floating over us.
// Show the right cursor.
var span = GetSpan(e.Location);
if (span != null)
{
GetStyleStack().PushStyle(StyleClass);
styleStack.PushStyle(span.Style);
this.Cursor = styleStack.GetCursor(this);
styleStack.PopStyle();
styleStack.PopStyle();
}
else
{
this.Cursor = Cursors.Default;
}
if (span != spanHover)
{
if (spanHover != null)
{
SpanLeave.Fire(this, new SpanEventArgs(spanHover));
}
spanHover = span;
if (span != null)
{
SpanEnter.Fire(this, new SpanEventArgs(span));
}
}
}
base.OnMouseMove(e);
}
private int GetCharPosition(Graphics g, Point ptClient, LayoutSpan span, StyleStack styleStack)
{
var x = ptClient.X - span.ContentExtent.Left;
var textStub = span.Text;
int iLow = 0;
int iHigh = textStub.Length;
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
var sz = MeasureText(g, textStub, font);
float xLow = 0;
float xHigh = sz.Width;
while (iLow < iHigh - 1)
{
int iMid = iLow + (iHigh - iLow) / 2;
textStub = span.Text.Substring(0, iMid);
sz = MeasureText(g, textStub, font);
if (x < sz.Width)
{
iHigh = iMid;
xHigh = sz.Width;
}
else
{
iLow = iMid;
xLow = sz.Width;
}
}
styleStack.PopStyle();
var cx = xHigh - xLow;
if (x - xLow > cx)
{
return(iHigh);
}
else
{
return(iLow);
}
}