GDIHitTestMetrics HitTestPoint(PointF pt, out bool isTrailingHit)
{
GDIHitTestMetrics hitTextMetrics = new GDIHitTestMetrics();
int pos = 0;
GDIHitTestMetrics m;
isTrailingHit = false;
//
if (txtHitRect.Count == 0)
{
bool ret = CreateHwnd();
if (ret == false)
{
return(hitTextMetrics);
}
SizeF sizeF;
if (g != null)
{
sizeF = g.MeasureString("x", ForeFont);
}
else
{
sizeF = TextRenderer.MeasureText("x", ForeFont);
}
hitTextMetrics = new GDIHitTestMetrics()
{
TextPosition = pos,
Left = 0,
Top = 0,
Width = 1,
Height = sizeF.Height,
Length = 1
};
return(hitTextMetrics);
}
//if (rowMetricsList == null)
rowMetricsList = ComputeRowMetricsList();
//
float h = rowMetricsList[rowMetricsList.Count() - 1].Top + rowMetricsList[rowMetricsList.Count() - 1].Height;
for (int i = 0; i < rowMetricsList.Count(); i++)
{
m = rowMetricsList[i];
if ((pt.Y >= m.Top && pt.Y <= (m.Top + m.Height)) ||
pt.Y < rowMetricsList[0].Top || pt.Y > h)
{
if (pt.Y < rowMetricsList[0].Top)
{
m = rowMetricsList[0];
}
else if (pt.Y > h)
{
m = rowMetricsList[rowMetricsList.Count() - 1];
}
if (pt.X >= m.Left && pt.X <= (m.Left + m.Width))
{
for (int j = m.TextPosition; j < m.TextPosition + m.Length; j++)
{
if (pt.X >= txtHitRect[j].Left &&
pt.X <= (txtHitRect[j].Left + txtHitRect[j].Width))
{
float a = pt.X - txtHitRect[j].Left;
float b = txtHitRect[j].Right - pt.X;
if (a <= b)
{
isTrailingHit = false;
}
else
{
isTrailingHit = true;
}
pos = j;
break;
}
}
}
else if (pt.X < m.Left)
{
pos = m.TextPosition;
isTrailingHit = false;
break;
}
else
{
pos = m.TextPosition + m.Length - 1;
isTrailingHit = true;
break;
}
}
}
hitTextMetrics = new GDIHitTestMetrics()
{
TextPosition = pos,
Left = txtHitRect[pos].Left,
Top = txtHitRect[pos].Top,
Width = txtHitRect[pos].Width,
Height = txtHitRect[pos].Height,
Length = 1
};
return(hitTextMetrics);
}
GDIHitTestMetrics[] ComputeRowMetricsList()
{
RectangleF baseRect = txtHitRect[0];
GDIHitTestMetrics hitTestMetrics = new GDIHitTestMetrics();
int startPos = 0;
List <GDIHitTestMetrics> rowMetricsSet = new List <GDIHitTestMetrics>();
RectangleF rect;
for (int i = 0; i < txtHitRect.Count(); i++)
{
rect = txtHitRect[i];
if ((rect.Top >= baseRect.Top &&
rect.Top < baseRect.Bottom) ||
(rect.Bottom >= baseRect.Bottom &&
rect.Bottom < baseRect.Top))
{
if (rect.Top < baseRect.Top)
{
baseRect.Y = rect.Top;
baseRect.Height += baseRect.Top - rect.Top;
}
if (rect.Bottom > baseRect.Bottom)
{
baseRect.Height += rect.Bottom - baseRect.Bottom;
}
baseRect.Width = rect.Right - baseRect.Left;
}
else
{
hitTestMetrics = new GDIHitTestMetrics()
{
TextPosition = startPos,
Left = baseRect.Left,
Top = baseRect.Top,
Width = baseRect.Width,
Height = baseRect.Height,
Length = i - startPos
};
rowMetricsSet.Add(hitTestMetrics);
startPos = i;
baseRect = txtHitRect[i];
}
}
hitTestMetrics = new GDIHitTestMetrics()
{
TextPosition = startPos,
Left = baseRect.Left,
Top = baseRect.Top,
Width = baseRect.Width,
Height = baseRect.Height,
Length = txtHitRect.Count() - startPos
};
rowMetricsSet.Add(hitTestMetrics);
return(rowMetricsSet.ToArray());
}
GDIHitTestMetrics[] HitTestTextRange(int textPosition, int textLength)
{
RectangleF baseRect;
RectangleF rect;
List <GDIHitTestMetrics> hitTextMetricsList = new List <GDIHitTestMetrics>();
GDIHitTestMetrics hitTextMetrics;
int startPos;
if (txtHitRect.Count == 0)
{
SizeF sizeF;
if (g != null)
{
sizeF = g.MeasureString("x", ForeFont);
}
else
{
sizeF = TextRenderer.MeasureText("x", ForeFont);
}
hitTextMetrics = new GDIHitTestMetrics()
{
TextPosition = 0,
Left = 0,
Top = 0,
Width = 1,
Height = sizeF.Height,
Length = 1
};
hitTextMetricsList.Add(hitTextMetrics);
return(hitTextMetricsList.ToArray());
}
if (textPosition >= txtHitRect.Count)
{
textPosition = txtHitRect.Count() - 1;
}
if (textPosition < 0)
{
textPosition = 0;
}
baseRect = txtHitRect[textPosition];
startPos = textPosition;
//
for (int i = textPosition - 1; i >= 0; i--)
{
rect = txtHitRect[i];
if ((rect.Top >= baseRect.Top &&
rect.Top < baseRect.Bottom) ||
(rect.Bottom >= baseRect.Bottom &&
rect.Bottom < baseRect.Top))
{
if (rect.Top < baseRect.Top)
{
baseRect.Y = rect.Top;
baseRect.Height += baseRect.Top - rect.Top;
}
if (rect.Bottom > baseRect.Bottom)
{
baseRect.Height += rect.Bottom - baseRect.Bottom;
}
}
}
//
for (int i = textPosition + 1; i < textLength + textPosition; i++)
{
rect = txtHitRect[i];
if ((rect.Top >= baseRect.Top &&
rect.Top < baseRect.Bottom) ||
(rect.Bottom >= baseRect.Bottom &&
rect.Bottom < baseRect.Top))
{
if (rect.Top < baseRect.Top)
{
baseRect.Y = rect.Top;
baseRect.Height += baseRect.Top - rect.Top;
}
if (rect.Bottom > baseRect.Bottom)
{
baseRect.Height += rect.Bottom - baseRect.Bottom;
}
baseRect.Width = rect.Right - baseRect.Left;
}
else
{
hitTextMetrics = new GDIHitTestMetrics()
{
TextPosition = startPos,
Left = baseRect.Left,
Top = baseRect.Top,
Width = baseRect.Width,
Height = baseRect.Height,
Length = i - startPos + 1
};
hitTextMetricsList.Add(hitTextMetrics);
startPos = i;
baseRect = txtHitRect[i];
}
}
//
for (int i = textLength + textPosition; i < txtHitRect.Count(); i++)
{
rect = txtHitRect[i];
if ((rect.Top >= baseRect.Top &&
rect.Top < baseRect.Bottom) ||
(rect.Bottom >= baseRect.Bottom &&
rect.Bottom < baseRect.Top))
{
if (rect.Top < baseRect.Top)
{
baseRect.Y = rect.Top;
baseRect.Height += baseRect.Top - rect.Top;
}
if (rect.Bottom > baseRect.Bottom)
{
baseRect.Height += rect.Bottom - baseRect.Bottom;
}
}
else
{
break;
}
}
hitTextMetrics = new GDIHitTestMetrics()
{
TextPosition = startPos,
Left = baseRect.Left,
Top = baseRect.Top,
Width = baseRect.Width,
Height = baseRect.Height,
Length = textLength + textPosition - startPos
};
hitTextMetricsList.Add(hitTextMetrics);
return(hitTextMetricsList.ToArray());
}
