Change font size of button dynamically

[ynatynat]

When a text of Button is long, the text will be omit.
But I wish to show all of text by changing font size dynamically.
How to do ?

Button{
    text:"very long name XXXXXXXXXXXX"
//font.pointSize: //<======change it dynamically
}

[Asperamanca]

First you need to know the size the text is going to require. You can determine that using a FontMetrics object.
Using that, you should be able to write a function that progressive decreases font size until the size fits

[ynatynat]

@Asperamanca
thank you. As you tell me, FontMetrics is good to know text size.
But, it doesn't show actual size text of label which placed in layout.
I gave up.