VideoTemplate<P> class abstract

A parameterized, data-driven video definition: one build that turns a Props value of type P into a Video.

Subclass it to describe a video shape once and render it for many inputs — the same definition produces a personalized intro per user, a stat reel per metric, a release card per changelog entry. build is a pure function of its P: it reads the props and returns a Video, with no IO and no wall-clock, so the same props always build the same tree. Combined with the frame-driven capture pipeline, identical props render the same frames, so a batch caches and goldens.

Render a template with the top-level renderTemplate free function, which builds template.build(props) and runs the same offline capture shell as render(video, aspect:):

final class IntroTemplate extends VideoTemplate<IntroProps> {
  const IntroTemplate();
  @override
  Video build(IntroProps props) => Video(
    size: VideoSize.reels,
    scenes: [Scene.centered(duration: 3.seconds, child: Text(props.name))],
  );
}

for (final user in users) {
  await renderTemplate(const IntroTemplate(), props: IntroProps(name: user.name), ...);
}

The built-in templates (TitleIntro, StatHighlight) extend this on the public element API, so each is also a worked example of building a Video from props.

Implementers

• StatHighlight
• TitleIntro

Constructors

VideoTemplate()

Const so a template carries no state of its own — every choice flows through build's P, keeping the definition a pure function of its props.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

build(P props) → Video

Builds the Video for props.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited