Qt is a popular open-source software framework for building cross-platform applications. One of its key features is the use of CSS classes to style the user interface of the application. In this article, we will explore the use of Qt CSS類選擇器 to style the various components of a Qt application.

Qt CSS類選擇器 are used to select specific elements on the page using CSS classes. A class is a set of CSS rules that can be applied to a specific element on the page. For example, if you want to style the button of a Qt application, you could create a class called "button" that includes specific CSS rules for the button's color, text, and other features.

To use a Qt CSS類選擇器， you need to have the necessary Qt CSS library installed. Once it is installed, you can create a new file in your Qt application's resources directory with the name "style.css". The file should contain a set of CSS rules that you want to use for style your application.

Here is an example of a simple Qt CSS類選擇器 that will select all elements with the class "button" on the page:

.button {

color: red;

text-align: center;

This rule will select all elements on the page that have the class "button", and will apply the color "red" to them, as well as applying the text-align property to the center.

You can use similar techniques to create more complex Qt CSS類選擇器， such as adding rules for other elements on the page, or applying different styles to different parts of the application.

In summary, Qt CSS類選擇器 are a powerful way to style the user interface of a Qt application using CSS classes. By creating a set of Qt CSS類選擇器， you can easily style different elements on the page, and change the overall look and feel of your application.