//判断是否是中文
public bool IsChina(char c)
{
bool BoolValue = false;
if (Convert.ToInt32(c) < Convert.ToInt32(Convert.ToChar(128)))
{
BoolValue = false;
}
else
{
return BoolValue = true;
}
return BoolValue;
}
//获取字符串中文数量
public int GetLineIsChinese(Line list)
{
int isChinese = 0;
for (int num = 0; num < list.Count;num++ )
{
if (IsChina(list[num].c))
{
isChinese++;
}
}
return isChinese;
}
//获取中文和英文差异宽度
public int GetCharDiffWidth()
{
SizeF sizef = GetCharSize(this.Font, '中');//new Font("宋体", 10)
int len = (int)sizef.Width - CharWidth;
return len;
}
//draw selection
if (!Selection.IsEmpty && lastChar >= firstChar)
{
e.Graphics.SmoothingMode = SmoothingMode.None;
var textRange = new Range(this, from + firstChar, iLine, from + lastChar + 1, iLine);
textRange = Selection.GetIntersectionWith(textRange);
if (textRange != null && SelectionStyle != null)
{
int chineseCount= GetLineIsChinese(line);
int diffWidths = GetCharDiffWidth()*chineseCount;
diffWidth = diffWidths;
SelectionStyle.Draw(e.Graphics, new Point(startX + (textRange.Start.iChar - from) * CharWidth, y),
textRange);
diffWidth = 0;
}
}
public override void Draw(Graphics gr, Point position, Range range)
{
//draw background
if (BackgroundBrush != null)
{
Rectangle rect = new Rectangle(position.X, position.Y, (range.End.iChar - range.Start.iChar) * range.tb.CharWidth+FastColoredTextBox.diffWidth, range.tb.CharHeight);
if (rect.Width == 0)
return;
gr.FillRectangle(BackgroundBrush, rect);
}
}
diffWidth 这是公共变量，放在FastColoredTextBox类的公共变量声明里面
public static int diffWidth = 0;
/*****************************/
/* 该代码用于准确定位字，主要是因为中文不能准确定位 */
/*****************************/
/// <summary>
/// Gets nearest line and char position from coordinates
/// </summary>
/// <param name="point">Point</param>
/// <returns>Line and char position</returns>
public Place PointToPlace(Point point)
{
#if debug
var sw = Stopwatch.StartNew();
#endif
point.Offset(HorizontalScroll.Value, VerticalScroll.Value);
point.Offset(-LeftIndent - Paddings.Left, 0);
int iLine = YtoLineIndex(point.Y);
int y = 0;
for (; iLine < lines.Count; iLine++)
{
y = LineInfos[iLine].startY + LineInfos[iLine].WordWrapStringsCount * CharHeight;
if (y > point.Y && LineInfos[iLine].VisibleState == VisibleState.Visible)
break;
}
if (iLine >= lines.Count)
iLine = lines.Count - 1;
if (LineInfos[iLine].VisibleState != VisibleState.Visible)
iLine = FindPrevVisibleLine(iLine);
//
int iWordWrapLine = LineInfos[iLine].WordWrapStringsCount;
do
{
iWordWrapLine--;
y -= CharHeight;
} while (y > point.Y);
if (iWordWrapLine < 0) iWordWrapLine = 0;
//
int start = LineInfos[iLine].GetWordWrapStringStartPosition(iWordWrapLine);
int finish = LineInfos[iLine].GetWordWrapStringFinishPosition(iWordWrapLine, lines[iLine]);
var x = (int)Math.Round((float)point.X / CharWidth);
x = x < 0 ? start : start + x;
if (x > finish)
x = finish + 1;
if (x > lines[iLine].Count)
x = lines[iLine].Count;
if (lines[iLine].Count > 0)
{
x = GetXWidth(lines[iLine], point.X);
}
#if debug
Console.WriteLine("PointToPlace: " + sw.ElapsedMilliseconds);
#endif
return new Place(x, iLine);
}
private Place PointToPlaceSimple(Point point)
{
point.Offset(HorizontalScroll.Value, VerticalScroll.Value);
point.Offset(-LeftIndent - Paddings.Left, 0);
int iLine = YtoLineIndex(point.Y);
var x = (int)Math.Round((float)point.X / CharWidth);
Line line = lines[iLine];
if (x < 0) x = 0;
if (line.Count > 0)
{
x = GetXWidth(lines[iLine], point.X);
}
return new Place(x, iLine);
}
//计算x轴应该显示第几个字的宽度
public int GetXWidth(Line line,int x)
{
int iChar = 0;
int len = 0;
for (int num = 0; num < line.Count; num++)
{
if (len >= x)
{
break;
}
if (IsChina(line[num].c))
{
iChar += 2;
len += (GetCharDiffWidth() + CharWidth);
}
else
{
iChar++;
len += CharWidth;
}
}
return iChar;
}
https://files.cnblogs.com/MyNameIsMT/FastColoredTextBox20140116.zip
