Measuring text width in Qt

Question

Using the Qt framework, how do I measure the width (in pixels) of a piece of text rendered with a given font/style?

Answer 1

You can use QFontMetrics class - see the width() method which can give you the width of a given QString.

QFont myFont(fontName, fontSize);; QString str("I wonder how wide this is?");  QFontMetrics fm(myFont); int width=fm.width(str); 

Answer 2

Since Qt 5.11 you must use horizontalAdvance() method of QFontMetrics class instead of width(). width() is now obselete.

QFont myFont(fontName, fontSize);; QString str("I wonder how wide this is?");  QFontMetrics fm(myFont); int width=fm.horizontalAdvance(str);