// return:
// -1 无需特殊处理
// 其他 需要切断的位置
static int DetectLineBreak(string strCurrentChar,
PrintLine line)
{
// 如果是西文分隔符号
if (SepChars.IndexOf(strCurrentChar) != -1)
return -1;
// 如果是中文字符
if (StringUtil.IsHanzi(strCurrentChar[0]) == true)
return -1;
for (int i = line.Boxes.Count - 1; i >= 0; i--)
{
Box box = line.Boxes[i];
if (SepChars.IndexOf(box.Text) != -1)
{
if (i == line.Boxes.Count - 1)
return -1;
return i + 1;
}
if (StringUtil.IsHanzi(box.Text[0]) == true)
{
if (i == line.Boxes.Count - 1)
return -1;
return i + 1;
}
}
return -1; // 如果整个line都是无法切割，就干脆放弃按词折行
}
// 获得一个行的最右端位置
static float GetLineWidth(PrintLine line)
{
float x = 0;
for (int i = 0; i < line.Boxes.Count; i++)
{
Box box = line.Boxes[i];
x += box.LeftBlank + box.Width;
}
return x;
}
// 将一个字符串切割为Line数组
// parameters:
// strTextParam ==null 表示触发<p>前面的初始化换行
// == "\r\n" 执行<br/>动作
int BuildLines(Graphics g,
RectParam rect_def,
string strTextParam,
Font font,
Color color,
ParagraphFormat p_format,
ref List<PrintLine> lines,
out string strError)
{
strError = "";
int nRet = 0;
float fLineHeight = 0;
string strFontString = GetFontString(font);
string strFontColor = GetColorString(color);
// 表示建立一个空的<p>元素显示位置
if (strTextParam == null)
{
SizeF size = g.MeasureString("1", font);
fLineHeight = size.Height;
float emheight = font.FontFamily.GetEmHeight(FontStyle.Regular);
float ascent = font.FontFamily.GetCellAscent(FontStyle.Regular);
PrintLine current_line = null;
current_line = new PrintLine();
current_line.HorzAlign = GetHorzAlign(p_format.Align);
current_line.Height = fLineHeight;
current_line.Width = rect_def.Width - rect_def.Padding.Horizontal;
current_line.FontDef = strFontString;
current_line.ColorDef = strFontColor;
current_line.BaseRatio = ascent / emheight;
lines.Add(current_line);
current_line.Indent = p_format.Indent;
return 0;
}
// 回车换行
if (strTextParam == "\r\n")
{
SizeF size = g.MeasureString("1", font);
fLineHeight = size.Height;
float emheight = font.FontFamily.GetEmHeight(FontStyle.Regular);
float ascent = font.FontFamily.GetCellAscent(FontStyle.Regular);
PrintLine current_line = null;
// 另起一行
current_line = new PrintLine();
current_line.HorzAlign = GetHorzAlign(p_format.Align);
current_line.Height = fLineHeight;
current_line.Width = rect_def.Width - rect_def.Padding.Horizontal;
current_line.FontDef = strFontString;
current_line.ColorDef = strFontColor;
current_line.BaseRatio = ascent / emheight;
lines.Add(current_line);
current_line.Indent = p_format.Indent;
return 0;
}
for (int j=0; ;j++ )
{
if (String.IsNullOrEmpty(strTextParam) == true)
break;
float emheight = font.FontFamily.GetEmHeight(FontStyle.Regular);
float ascent = font.FontFamily.GetCellAscent(FontStyle.Regular);
int nLen = Math.Min(30, strTextParam.Length);
string strText = strTextParam.Substring(0, nLen);
strTextParam = strTextParam.Remove(0, nLen);
CharacterRange[] ranges = new CharacterRange[strText.Length];
for (int i = 0; i < strText.Length; i++)
{
ranges[i] = new CharacterRange(i, 1);
}
StringFormat format = new StringFormat();
format.FormatFlags = StringFormatFlags.NoClip ;
format.SetMeasurableCharacterRanges(ranges);
Region[] regions = new Region[strText.Length];
{
SizeF size = g.MeasureString(strText, font);
fLineHeight = size.Height;
RectangleF layout = new RectangleF(0, 0, size.Width, size.Height);
regions = g.MeasureCharacterRanges(
strText,
font,
layout,
format);
}
// 切割为若干行
{
float x = 0;
PrintLine current_line = null;
if (lines.Count == 0)
{
current_line = new PrintLine();
current_line.HorzAlign = GetHorzAlign(p_format.Align);
current_line.Height = fLineHeight;
current_line.Width = rect_def.Width - rect_def.Padding.Horizontal;
current_line.FontDef = strFontString;
current_line.ColorDef = strFontColor;
current_line.BaseRatio = ascent / emheight;
lines.Add(current_line);
x = p_format.Indent;
current_line.Indent = p_format.Indent;
}
else
{
current_line = lines[lines.Count - 1];
x = GetLineWidth(current_line) + current_line.Indent;
}
for (int i = 0; i < regions.Length; i++)
{
string strCurrentChar = strText.Substring(i, 1);
Region region = regions[i];
RectangleF rect = region.GetBounds(g);
if (x + rect.Width > rect_def.Width - rect_def.Padding.Horizontal)
{
if (p_format.LineBreak == "word")
{
// return:
// -1 无需特殊处理
// 其他 需要切断的位置
nRet = DetectLineBreak(strCurrentChar,
current_line);
}
else
nRet = -1;
if (nRet != -1)
{
PrintLine prev_line = current_line;
// 另起一行
current_line = new PrintLine();
current_line.HorzAlign = GetHorzAlign(p_format.Align);
current_line.Width = rect_def.Width - rect_def.Padding.Horizontal;
current_line.BaseRatio = prev_line.BaseRatio;
lines.Add(current_line);
x = 0;
int nStart = nRet;
// 准备字体、颜色字符串
string strTempFontString = prev_line.FontDef;
string strTempColorString = prev_line.ColorDef;
for (int k = 0; k <= nStart; k++)
{
Box box = prev_line.Boxes[k];
if (string.IsNullOrEmpty(box.FontDef) == false)
strTempFontString = box.FontDef;
if (string.IsNullOrEmpty(box.ColorDef) == false)
strTempColorString = box.ColorDef;
}
current_line.FontDef = strTempFontString;
current_line.ColorDef = strTempColorString;
// 切断，同时获得行高度
float fTempLineHeight = 0;
int nCount = prev_line.Boxes.Count;
for (int k = nStart; k < nCount; k++)
{
Box box = prev_line.Boxes[nStart];
current_line.Boxes.Add(box);
prev_line.Boxes.RemoveAt(nStart);
if (fTempLineHeight < box.Height)
fTempLineHeight = box.Height;
}
current_line.Height = fTempLineHeight;
}
else
{
// 另起一行
current_line = new PrintLine();
current_line.HorzAlign = GetHorzAlign(p_format.Align);
current_line.Height = fLineHeight;
current_line.Width = rect_def.Width - rect_def.Padding.Horizontal;
current_line.FontDef = strFontString;
current_line.ColorDef = strFontColor;
current_line.BaseRatio = ascent / emheight;
lines.Add(current_line);
x = 0;
}
}
else
{
}
if (current_line.Boxes.Count == 0
&& lines.Count > 1
&& strCurrentChar == " ")
{
// 忽略第二行以后最左端的空格
}
else
{
Box box = new Box();
box.Text = strCurrentChar;
box.Width = rect.Width;
box.Height = rect.Height;
box.Base = fLineHeight * ascent / emheight;
if (i == 0 && j == 0)
{
box.FontDef = strFontString;
box.ColorDef = strFontColor;
}
if (current_line.Height < fLineHeight)
{
current_line.Height = fLineHeight;
}
current_line.Boxes.Add(box);
x += rect.Width;
}
}
}
}
return 0;
}