QLineEdit限制部分输入

我这里要显示页码，如 1/10，只能修改 "/" 前面的，而总页数不能修改。

1. 设置正则表达式

QRegExp rx("(^[0-9]{0,3}/[0-9]{0,3}$)");
QRegExpValidator *reg=new QRegExpValidator(rx);
m_EdtCurPage->setValidator(reg);

2. 限制输入

connect(m_EdtCurPage,SIGNAL(cursorPositionChanged(int,int)),this,SLOT(cursorChangedSlot(int,int)));
void MainWindow::cursorChangedSlot(int oldPos,int newPos)
{
    Q_UNUSED(oldPos)
    QString nowValue=m_EdtCurPage->text();
    int index=nowValue.indexOf("/");
    if(index<newPos) m_EdtCurPage->setReadOnly(true);
    else m_EdtCurPage->setReadOnly(false);
    int page=nowValue.split("/").first().toInt();
    if(page>m_TotalPages) m_EdtCurPage->backspace();
}

3. 响应修改

connect(m_EdtCurPage,SIGNAL(returnPressed()),this,SLOT(edtCurPageSlot()));
connect(m_EdtCurPage,SIGNAL(editingFinished()),this,SLOT(edtCurPageSlot()));
void MainWindow::edtCurPageSlot()
{
    QString nowValue=m_EdtCurPage->text();
    int page=nowValue.split("/").first().toInt();
    if(page>0&&page<=m_TotalPages) m_CurPage=page;
    actRefSlot();
}