计算qplainttextedit当前cursor的行号

shiroki

1.         //get the current line number
   
2.         QTextCursor tc = edit->textCursor();
   
3.         QTextLayout* lo = tc.block().layout();
   
4.         //get the relative position in the block
   
5.         int pos = tc.position() - tc.block().position();
   
6.         int line = lo->lineForTextPosition(pos).lineNumber() + tc.block().firstLineNumber();
   
7.         qWarning() << line;

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