Qt Widgets Designer Integration

Qt Widgets Designer is an excellent tool to preview style sheets. You can right-click on any widget in Designer and select Change styleSheet... to set the style sheet.

Editing a form in Qt Widgets Designer

Qt Widgets Designer also includes a style sheet syntax highlighter and validator. The validator indicates if the syntax is valid or invalid, at the bottom left of the Edit Style Sheet dialog.

Editing and validating a stylesheet

When you click OK or Apply, Qt Widgets Designer will automatically display the widget with its new stylesheet.

Preview of a form with the new stylesheet