state-changes
Use when elements transform in place - toggle switches, expanding accordions, checkbox animations, button states, or any transformation without entering/exiting.
- Installs
- 492
- Last 24h
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/dylantarre/animation-principles --skill state-changes- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads state-changes automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
State Change Animations
Apply Disney's 12 principles when elements transform without leaving.
Principle Application
Squash & Stretch: Elements compress before expanding. A toggle switch squashes 5% before sliding.
Anticipation: Wind up before the change. Slight reverse movement (2-3px) before expanding.
Staging: Keep transformations centered on user focus. Don't let state changes distract from the interaction point.
Straight Ahead vs Pose-to-Pose: Define exact states. Button has rest, hover, active, disabled - each precisely designed.
Follow Through & Overlapping: Parts transform at different rates. Icon rotates before label fades in.
Slow In/Slow Out: Use ease-in-out for bidirectional changes: cubic-bezier(0.4, 0, 0.2, 1).
Arcs: Rotating elements follow natural arcs. Chevrons rotate on their center point, not linearly.
Secondary Action: Pair the primary change with supporting motion. Toggle sliding + color shift + icon swap.
Timing:
- Micro-states: 100-150ms (checkbox tick, radio fill)
- Standard states: 150-250ms (toggles, accordions)
- Complex states: 250-400ms (multi-part transformations)
Exaggeration: Overshoot slightly on state changes. Toggle goes 2px past, then settles.
Solid Drawing: Maintain element integrity during transformation. No distortion that breaks visual consistency.
Appeal: State changes should feel satisfying. Users clicked with intent - reward that intent.
Timing Recommendations
| State Change | Duration | Easing | Notes |
|---|---|---|---|
| Checkbox | 150ms | ease-out | Tick draws in |
| Toggle Switch | 200ms | ease-in-out | Overshoot slightly |
| Radio Button | 150ms | ease-out | Scale in from center |
| Accordion | 250ms | ease-in-out | Height + rotation |
| Tab Switch | 200ms | ease-in-out | Indicator slides |
| Button Active | 100ms | ease-out | Scale to 0.97 |
| Card Expand | 300ms | ease-in-out | All properties together |
Implementation Pattern
.toggle {
transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}
.toggle-knob {
transition: transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1); /* Overshoot */
}
.toggle.active .toggle-knob {
transform: translateX(20px);
}
Accordion Pattern
.accordion-content {
display: grid;
grid-template-rows: 0fr;
transition: grid-template-rows 250ms ease-in-out;
}
.accordion.open .accordion-content {
grid-template-rows: 1fr;
}
Key Rule
State changes are reversible. The animation to state B should be the inverse of animation to state A. Test both directions.
FAQ
What does the state-changes skill do?
Use when elements transform in place - toggle switches, expanding accordions, checkbox animations, button states, or any transformation without entering/exiting.
How do I install state-changes?
Run npx skills add https://github.com/dylantarre/animation-principles --skill state-changes in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/state-changes/ (personal) or .claude/skills/state-changes/ (project).
Which AI agents can use state-changes?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is state-changes safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains state-changes?
It is published by dylantarre in dylantarre/animation-principles. It has 492 recorded installs.
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