"Blinking" tooltip

[Folco]

Hi,

I'm using Qt5.7 32 bits bundled with MinGW, Win10 x64.

I'm using a QLineEdit in a QWizardPage.
I want the user to give a valid path.
Here is a screenshot to visualize : http://www.mirari.fr/GRJw.png

Here is the relevant part of the header:

class PageParkLocation : public QWizardPage
{
    public:
        PageParkLocation(QWidget* parent, QString title);

    private:
        QLineEdit* editLocation;
        bool isComplete() const override;

As said in the QWizardPage documentation, I have overriden the isComplete method to ensure that the path is valid before the user may continue.

Here is my code:

bool PageParkLocation::isComplete() const
{
    // Don't use the QDir(QString str) constructor, because the path is set to QDir::homePath() if str is empty
    QDir dir;
    dir.setPath(this->editLocation->text());

    // Complete is the return value, true if the user may continue, else false
    bool complete = dir.exists();

    if (complete || this->editLocation->text().isEmpty()) {
        // Don't draw any tooltip if the input is empty or invalid
        QToolTip::hideText();
    }
    else {
        // Show the tooltip just below the ```QLineEdit``` widget
        QPoint position = this->editLocation->mapToGlobal(QPoint(0, 10));
        QToolTip::showText(position, toolTipNotComplete, this->editLocation);
        }
    }

    return complete;
}

This looks really basic code.

PROBLEM: But when the input is invalid, I get the tooltip shown only on on two characters (sorry, probably bad english).
Example: When I type "ABCDEF", I will get the tooltip shown for 'A', 'C', 'E', and hidden for 'B', 'D' and 'F'. And obviously, I haven't any valid path like "AB", "ABCD" or "ABCDEF". So, the tooltip should appear every time I type a character.

Some notes:

• complete is computed correctly, because the "Next" button is never enabled when it should be disabled
• if I set a QLabel visible/invisible with this logic, instead of aQToolTip, it works.
• the toolTipNotComplete var is a static QString, but I get the same with a local string

Thanks for any help. :)

[raven-worx]

@Folco
Here is what happens:

1. you type 'A'
2. tooltip gets shown
3. you type 'B' -> tooltip gets closed on key input (i guess since its a popup window)
4. you type 'C' and show the tooltip again
5. ...

So using a tooltip is the wrong approach here. The actual intention of a tooltip is to show it on mouse hover.
So you should go with your label approach.