java - How can I get the width and the height of a JavaFX Label? -

there 2 methods getwidth , getheight return old label size if changed label text value.

for example, in code, background not correctly resized:

label speedlabel = new label(); rectangle backgroundlabel = new rectangle();  // initialization  // change label text speedlabel.settext(connection.getspeed_bps()); // sets bigger number  // adjust background backgroundlabel.setwidth(speedlabel.getwidth()); backgroundlabel.setheight(speedlabel.getheight()); 

after initialization, label that:

and after text change , background adjustment, label that:

i had @ post recommends deprecated method:

how label.getwidth() in javafx

the reason returning "old" size label doesn't updated on gui in moment when set textproperty of it, therefore size not changed.

you can listen widthproperty , heightproperty of label , resize rectangle in listener:

speedlabel.widthproperty().addlistener((obs, oldval, newval) -> {     backgroundlabel.setwidth(newval.doublevalue()); });  speedlabel.heightproperty().addlistener((obs, oldval, newval) -> {     backgroundlabel.setheight(newval.doublevalue()); }); 

or use bindings between properties:

backgroundlabel.heightproperty().bind(speedlabel.heightproperty()); backgroundlabel.widthproperty().bind(speedlabel.widthproperty()); 

but if want achieve label background, don't need rectangle, css - can check question: fxml stackpane doesn't align children correctly