怎么确定editor已经翻到文档结尾和文档开始

如何确定editor已经翻到文档结尾和文档开始
如何确定editor已经翻到文档结尾和文档开始

------解决方案--------------------
则和要通过获取行来计算，这是我曾经在RichTextEditor中实现其模拟Label显示时的滚动效果。。希望可以有所帮助。。。

C/C++ code


TTmLineInfo lineInfo;
        TTmPosInfo2 posInfo;

        TInt totalLineNumber = iAnsLabel->TextLayout()->GetLineNumber(iAnsLabel->RichText()->DocumentLength());
        

        //获取当前光标在文本中的行数
        TInt currentLineNumber;
        TTmDocPosSpec docPos(iAnsLabel->CursorPos(),
                TTmDocPosSpec::ELeftToRight);
        iAnsLabel->TextView()->FindDocPosL(docPos, posInfo, &lineInfo);
        currentLineNumber=lineInfo.iLineNumber;

        const TRect viewRect = iAnsLabel->TextView()->ViewRect(); // visiable rect
        //获取当前屏幕中最下面行在文本中的行数(brLineNumber)及右底端光标的坐标(brPos)
        TInt brLineNumber/*, brPos*/;
        iAnsLabel->TextLayout()->FindXyPos(viewRect.iBr, posInfo, &lineInfo);
        brLineNumber=lineInfo.iLineNumber;、
        //获取当前屏幕中最上面行在文本中的行数(tlLineNumber)及左顶端光标的坐标(tlPos)
        TInt tlLineNumber/*, tlPos*/;
        iAnsLabel->TextLayout()->FindXyPos(viewRect.iTl, posInfo, &lineInfo);
        tlLineNumber=lineInfo.iLineNumber;
        //tlPos=posInfo.iDocPos.iPos;

        TInt viewRectLineNumber=brLineNumber-tlLineNumber;

        if (aKeyEvent.iCode == EKeyUpArrow)
            {
            if (currentLineNumber == brLineNumber)
                {
                //iAnsLabel->SetCursorPosL(tlPos, EFalse);
                for (TInt i=0; i<viewRectLineNumber; i++)
                    iAnsLabel->MoveCursorL(TCursorPosition::EFLineUp, EFalse);
                }
            }
        if (aKeyEvent.iCode == EKeyDownArrow)
            {
            if (currentLineNumber == tlLineNumber)
                {
                //iAnsLabel->SetCursorPosL(brPos, EFalse);
                for (TInt i=0; i<viewRectLineNumber; i++)
                    iAnsLabel->MoveCursorL(TCursorPosition::EFLineDown, EFalse);
                }
            //if(iAnsLabel->CursorPos() == iAnsLabel->RichText()->DocumentLength())
            if (currentLineNumber == totalLineNumber)
                {
                this->SwitchFocus();
                return EKeyWasConsumed;
                }
            }
        }

------解决方案--------------------

TextLength和PosRangeInBand结合使用

怎么确定editor已经翻到文档结尾和文档开始

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