QLineEdit限制数字输入范围

QLineEdit限制经纬度输入范围和整形输入范围，double和int采用两种不同的方式进行。

int输入范围限制，重写QIntValidator

class MyIntValidator : public QIntValidator
{
	Q_OBJECT
public:
	explicit MyIntValidator(QObject * parent = 0) :QIntValidator(parent)
	{
	}
	MyIntValidator(int bottom, int top, QObject * parent) :QIntValidator(bottom, top, parent)
	{
	}
	virtual void setRange(int bottom, int top)
	{
		QIntValidator::setRange(bottom, top);
	}
	~MyIntValidator()
	{
	}
	virtual State validate(QString &s, int &n) const
	{
		return QIntValidator::validate(s, n);
	}
	virtual void fixup(QString &s) const
	{
		//s = QString("%1").arg(bottom());
		s = QString("");
	}
};

double输入限制

class MyDoubleValidator : public QDoubleValidator
{
	Q_OBJECT
public:
	explicit MyDoubleValidator(QObject * parent = 0) :QDoubleValidator(parent)
	{
	}
	MyDoubleValidator(double bottom, double top,int decimals, QObject * parent) :QDoubleValidator(bottom, top, decimals, parent)
	{
	}
	virtual void setRange(double bottom, double top, int decimals)
	{
		QDoubleValidator::setRange(bottom, top, decimals);
	}
	~MyDoubleValidator()
	{
	}
	virtual State validate(QString &str, int &n) const
	{
		if (())
		{
			return QValidator::Intermediate;
		}
		int a = 1;
		bool cOK = false;
		double val = (&cOK);

		if (!cOK)
		{
			return QValidator::Invalid;
		}

		int dotPos = (".");
		if (dotPos > 0)
		{
			if ((() - dotPos - 1).length() > decimals())
			{
				return QValidator::Invalid;
			}
		}
		if (val< top() && val > bottom())
		{
			return QValidator::Acceptable;
		}

		return QValidator::Invalid;
	}
	virtual void fixup(QString &s) const
	{
		//s = QString("%1").arg(bottom());
		s = QString("");
	}
};

使用方法：

->setValidator(new MyDoubleValidator(-180.0, 180.0,8, ));//8代表小数位数
->setValidator(new MyIntValidator(1, 1000, ));