Duilib-基于CEditUI实现可限制输入范围的数字编辑框

numberedit.cpp

class NumberEditUI : public CEditUI {
public:
    NumberEditUI() : CEditUI() 
    {
        this->OnNotify += DuiLib::MakeDelegate(this, &NumberEditUI::OnTextChanged);
    }
protected:
    virtual void SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue) override
    {
        if (_tcsicmp(pstrName, _T("min")) == 0) {
            m_min = _tstof(pstrValue);
            m_bValidateMin = true;
        }
        else if (_tcsicmp(pstrName, _T("max")) == 0) {
            m_max = _tstof(pstrValue);
            m_bValidateMax = true;
        }
        else {
            CEditUI::SetAttribute(pstrName, pstrValue);
        }
    }
    bool OnTextChanged(PVOID param)
    {
        TNotifyUI *event = (TNotifyUI *)param;
        if (event->sType != DUI_MSGTYPE_TEXTCHANGED) return true;
        CDuiString text = this->GetText();
        regex rx(R"((?:^|\s)[+-]?(([[:digit:]]+(?:\.[[:digit:]]*)?))?(?=$|\s))");

        if (text.IsEmpty()) goto VALID;
        if (!std::regex_match(FrameUtils::wstring2string(text.GetData()), rx)) goto INVALID;
        double current = _tstof(text.GetData());
        if (m_bValidateMin && (current < m_min)) goto INVALID;
        if (m_bValidateMax && (current > m_max)) goto INVALID;
    VALID:
        m_oldValue = text;
        return true;
    INVALID:
        this->SetText(m_oldValue);
        this->SetSel(m_oldValue.GetLength(), m_oldValue.GetLength());
        return true;
    }
protected:
    double m_min, m_max;
    bool m_bValidateMin = false, m_bValidateMax = false;
    CDuiString m_oldValue;
};