QSS

QSS, an acronym for Qt Style Sheets, is a styling language used with the Qt framework. It provides a powerful and flexible way to customize the appearance of Qt widgets, similar to how CSS is used for web pages. QSS allows developers to control various aspects of a widget's look and feel, including colors, fonts, borders, backgrounds, and spacing.

The syntax of QSS is heavily inspired by CSS, making it familiar to web developers. It uses selectors to target specific widgets or widget types, and properties to define their styling attributes. For example, a developer could use QSS to change the background color of all QPushButton widgets or to set a specific font for all QLabel widgets within a particular window.

QSS can be applied to individual widgets, entire windows, or even globally to an application. This allows for consistent styling across the user interface. Styles can be loaded from external .qss files or set directly within the code. This separation of style from logic makes applications easier to maintain and allows for rapid visual iteration.

Beyond basic styling, QSS also supports more advanced features like pseudo-states (e.g., :hover, :pressed) to change widget appearance based on user interaction, and property selectors to target widgets based on their properties. QSS is a valuable tool for creating visually appealing and distinct user interfaces with Qt.