function PageWordBoxes: TPdfWordBoxes;
TPdfWordBoxes词框按空白符、制表符、换行符和 NBSP 字符拆分页面文本
组件方法还会将 FPDFText_GetCharBox 矩形合并为每个单词一个页面空间 TPdfRectangle
var Words: TPdfWordBoxes;
Rects: TPdfRectangles;
begin
Words := Pdf1.PageWordBoxes;
if Length(Words) > 0 then
begin
SetLength(Rects, 1);
Rects[0] := Words[0].Rect;
PdfView1.SetReadingHighlight(Rects, Words[0].Page);
end;
end;