何塞——
希望这个代码框架会有所帮助……我假设您是从 MSDN 上的 Advanced Text Formatting 项目开始的,遗憾的是它不是很先进。这是您可以引入 MainWindow.Xaml.cs 的代码片段:
TextParagraphProperties textParagraphProperties = new GenericTextParagraphProperties(TextAlignment.Left,
false);
TextRunCache textRunCache = new TextRunCache();
// By default, this is the first line of a paragrph
bool firstLine = true;
while (textStorePosition < _textStore.Length)
{
// Create a textline from the text store using the TextFormatter object.
TextLine myTextLine = formatter.FormatLine(
_textStore,
textStorePosition,
96 * 6,
// ProxyTextParagraphProperties will return a different value for the Indent property,
// depending on whether firstLine is true or not.
new ProxyTextParagraphProperties(textParagraphProperties, firstLine),
lastLineBreak,
textRunCache);
// Draw the formatted text into the drawing context.
Debug.WriteLine("linePosition:" + linePosition);
myTextLine.Draw(dc, linePosition, InvertAxes.None);
// Update the index position in the text store.
textStorePosition += myTextLine.Length;
// Update the line position coordinate for the displayed line.
linePosition.Y += myTextLine.Height;
// Figure out if the next line is the first line of a paragraph
var textRunSpans = myTextLine.GetTextRunSpans();
firstLine = (textRunSpans.Count > 0) && (textRunSpans[textRunSpans.Count - 1].Value is TextEndOfParagraph);
lastLineBreak = myTextLine.GetTextLineBreak();
}
您将需要创建类 ProxyTextParagraphProperties,该类继承自 TextParagraphProperties。这是我为测试它所做的一个片段:
class ProxyTextParagraphProperties : TextParagraphProperties
{
private readonly TextParagraphProperties _paragraphProperties;
private readonly bool _firstLineInParagraph;
public ProxyTextParagraphProperties(TextParagraphProperties textParagraphProperties, bool firstLineInParagraph)
{
_paragraphProperties = textParagraphProperties;
_firstLineInParagraph = firstLineInParagraph;
}
public override FlowDirection FlowDirection
{
get { return _paragraphProperties.FlowDirection; }
}
// implement the same as above for all the other properties...
// But we need to handle this one specially...
public override double Indent
{
get
{
return _firstLineInParagraph ? _paragraphProperties.Indent : 0;
}
}
}