Pseudo Classes

Pseudo classes are generated by a control, usually as a response to some sort of state.

For example :pointerover pseudo class indicates that the pointer input is currently over (inside the bounds of) a control.

Pseudo classes are not set in the Classes attributes of a control (unlike style classes).

Common pseudo classes include:

:focus, :disabled, :pressed for buttons, and :checked for checkboxes.

A control can have more than one pseudo class active at a time.

You can target one or more pseudo classes in a style selector. For example:

<Style Selector="Button.red:focus:pointover">

This selector targets button controls with the red class set, and that are in the :focus and the :pointover pseudo class state.

Some common pseudo classes:

Pseudo Class	Description
:pointerover	The pointer input is currently over (inside the bounds of) a control
:focus	A control has the input focus.
:disabled	A control is unable to respond to user interaction.
:pressed	A button control is in the down position.
:checked	A checkbox control is selected (check mark is showing).

Custom Pseudo Classes

You can create your own pseudo classes for custom controls based on CustomControl or TemplatedControl. The function below adds or remove a pseudo class depending on a Boolean value on a StyledElement.

PseudoClasses.Set(":className", bool);