inputMask fills QLineEdit with spaces

Question

When I set inputMask to "99999" , run program, and mouse clicking to QLineEdit, it filled with 5 spaces, so I have to delete the spaces first, and only then put the value I need.

I've tried to set cursor position to 0 ,but it doesn't work. Also tried to set text to empty string, same result.

ui->engineCapacity_lineEdit->setInputMask("99999");
ui->engineCapacity_lineEdit->setCursorPosition(0);
ui->engineCapacity_lineEdit->setText("");

It suppose to put cursor to the beginning of lineEdit, instead it's on 5th character of the line

@eyllanesc yes, i want cursor be at the begining every time i click QLineEdit, as it happens if there is no inputMask, is there a way? Actually then i use TAB to get into QLineEdit it works as i expect it to, cursor being placed at the begining — Vanya Ryanichev, Jul 29 '19 at 09:00

score 1 · Answer 1 · edited Dec 13 '19 at 18:04

By default QLineEdit will set the cursor based on the position of the click, and in the case that the number of characters is restricted as in your case and if you press outside the valid sector then the cursor will be placed on the right edge of that sector.

If you want that to happen then you must implement that logic in the mousePressEvent:

class LineEdit: public QLineEdit
{
public:
    using QLineEdit::QLineEdit;
protected:
    void mousePressEvent(QMouseEvent *event)
    {
        QLineEdit::mousePressEvent(event);
        setCursorPosition(0);
    }
};

If you want to use that QLineEdit in your .ui then you must promote it for this you can check the following publications:

Another way to implement the same logic is using an event filter:

*.h

class YourClass: public Foo{
// ...
public:
    bool eventFilter(QObject *obj, QEvent *event);
};

*.cpp

    // constructor
    ui->setupUi(this);
    ui->engineCapacity_lineEdit->installEventFilter(this);
    // ...

bool YourClass::eventFilter(QObject *obj, QEvent *event){
    if(obj == ui->engineCapacity_lineEdit && event->type() == QEvent::MouseButtonPress)
    {
        ui->engineCapacity_lineEdit->setCursorPosition(0);
    }
    return Foo::eventFilter(obj, event);
}

inputMask fills QLineEdit with spaces

1 Answers1