To keep things organized, UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Toolkit has adopted BEM as the methodology for styling elements. While using BEM is not mandatory, it is recommended.
BEM stands for Block Element Modifier. BEM is a simple system that helps you write structured, non-ambiguous, easy to maintain selectors. With BEM, you assign classes to elements and then use these classes as the selectors in style sheets.
BEM classes have up to three components:
menu
, button
, list-view
menu__item
, button__icon
, or list-view__item
menu--disabled
, menu__item--disabled
, button--small
, or list-view__item--selected
.Each name part may consist of Latin letters, digits, and dashes. Each name part is joined together with either a double underscore __
or a double dash --
.
The following example shows XML code for a menu:
<VisualElement class="menu">
<Label class="menu__item" text="Banana" />
<Label class="menu__item" text="Apple" />
<Label class="menu__item menu__item--disabled" text="Orange" />
</VisualElement>
Since each element is equipped with classes that describe its role and appearance, you can write most of your selectors with only one class name:
.menu {
}
.menu__item {
}
.menu__item--disabled {
}
You should be able to style elements using a single class name. However, in some cases, you may need to use complex selectors. For example, you could use a complex selector when the style of an element depends on the modifier of its block:
.button {
}
.button__icon {
}
.button--small {
}
.button--small .button__icon {
}
Be careful that you do not specify long selectors. A long selector could indicate inconsistencies in the graphic design of your UI. You should also avoid using type names (Button
, Label
) or element names (#my-button
) in your BEM selectors.
VisualElement
BEM-friendlyUI Toolkit adheres to BEM. Each visual element has the necessary class names attached. For example, all TextElement
have the unity-text-element
class. Each instance of Button
, which derives from TextElement
, has its class list populated with the unity-button
and unity-text-element
classes.
If you derive a new element from VisualElement
or one of its descendants, following these guidelines to ensure that your element is easy to style using the BEM methodology:
AddToClassList()
in the constructor to add the relevant USS classes to your element instances.my-block__first-child
, my-block__other-child
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