c# - WPF TextFormatter 中最后一行的完全对齐

Question

我正在使用 TextFormatter 制作 WPF 文本编辑器。我需要证明每个段落中的最后 行。

类似的东西:

I need to justify the last line in each
paragraph I need to justify the last li
ne in each  paragraph I need to justify 
the  last line in each paragraph I need 
to    justify    the   last   line   in

如何做到这一点？

提前致谢!

Answer 1

在您的 TextSource 实现中，在 GetTextRun 函数中，在每个段落的末尾返回一个非常宽的 TextEmbeddedObject 对象，并带有高度 0.

这样您将强制最后一行对齐。

class MyTextEmbeddedObject : TextEmbeddedObject
{
    public override LineBreakCondition BreakBefore => LineBreakCondition.BreakAlways;

    public override LineBreakCondition BreakAfter => LineBreakCondition.BreakRestrained;

    public override bool HasFixedSize => true;

    public override CharacterBufferReference CharacterBufferReference => throw new NotImplementedException();

    public override int Length => 1;

    public override TextRunProperties Properties => GenericTextParagraphProperties._defaultTextRunProperties;

    public override Rect ComputeBoundingBox(bool rightToLeft, bool sideways)
    {
        throw new NotImplementedException();
    }

    public override void Draw(DrawingContext drawingContext, Point origin, bool rightToLeft, bool sideways)
    {
        throw new NotImplementedException();
    }

    public override TextEmbeddedObjectMetrics Format(double remainingParagraphWidth)
    {
        return new TextEmbeddedObjectMetrics(10000 /* very wide width */, 0, 0);
    }
}