Simple Animations

Touying provides two markers for simple animation effects: #pause and #meanwhile.

pause

The purpose of #pause is straightforward – it separates the subsequent content into the next subslide. You can use multiple #pause to create multiple subslides. Here's a simple example:

#slide[
  First #pause Second

  #pause

  Third
]

This example will create three subslides, gradually revealing the content.

As you can see, #pause can be used inline or on a separate line.

meanwhile

In some cases, you may need to display additional content simultaneously with #pause. In such cases, you can use #meanwhile.

#slide[
  First
  
  #pause
  
  Second

  #meanwhile

  Third

  #pause

  Fourth
]

This example will create only two subslides, with "First" and "Third" displayed simultaneously, and "Second" and "Fourth" displayed simultaneously.

Handling layout functions

If you use layout functions like grid inside slide[..], you might be surprised to find that subsequent #pause and #meanwhile do not work. This is because Touying cannot detect the content inside layout functions. But you can use the composer parameter of #slide() to meet most requirements.

Internals

Touying doesn't rely on counter and locate to implement #pause. Instead, it has a parser written in Typst script. It parses the input content block as a sequence and then transforms and reorganizes this sequence into the series of subslides we need.