Angular Animation: Mastering the animation Function

Primary entry point exports

Functions - animation

The "animation" function in Angular animations is a powerful tool that allows you to produce reusable animations. These animations can be invoked in other animations or sequences by calling the useAnimation function. Let's dive into the details with a more elaborate example:

Function:

Parameters:

The "steps" property is one of the parameters of this animation function, and it refers to one or more animation objects that form a transformation from one state to another. These animation objects are typically created using the animate() or sequence() functions.

    - steps:  This parameter accepts either a single animation object ("AnimationMetadata") or an array of animation objects ("AnimationMetadata[]"). Each animation object represents a step or a specific transformation in the animation.

The "options" property is one of the parameters of this "animation" function, and it refers to an options object that can contain a delay value for the start of the animation and additional developer-defined parameters.

    - options: This parameter accepts an options object ("AnimationOptions"). This object may include a "delay" value for the start of the animation and any other parameters defined by the developer.

Returns:

    - AnimationReferenceMetadata: An instance that encapsulates essential information about the animation, providing an organized and accessible representation of the associated animation data.

Usage Notes:

Example - Defining a Reusable Animation:

In this example, we define a reusable fade animation. The animation consists of a style step setting the initial opacity, followed by an animate step transitioning the opacity over a specified time. Default parameter values are provided in the options object.

Example - Invoking the Animation:

Here, we invoke the defined "fadeAnimation" using the "useAnimation" function. We pass in override parameter values, specifying a different time, start, and end values. If any parameter values are missing, the default values from the animation definition are used.

Error Handling:

If one or more parameter values are missing before a step is animated, "useAnimation" throws an error, ensuring that all required parameters are provided.

Summary:

The "animation" function is a versatile feature in Angular animations, enabling the creation of reusable animation sequences. By defining default parameters and allowing for overrides, it provides flexibility in animation usage. This capability contributes to cleaner and more maintainable code, especially when dealing with complex animations or sequences in Angular applications.

Source: https://angular.io/api/animations/animation#animation

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