/dotween-design

name: unity-dotween-design
description: Source-anchored design rules for DOTween 1.3.015

> **Before calling any skill in this module:** if you are about to call a skill with parameters guessed from its name or description, STOP — read this file (or fetch its schema via `GET /skills/recommend?includeSchema=true`) first. If you already have the parameter definitions from recommend/schema, you may proceed straight to dryRun.

Triggers

• Writing or reviewing DOTween code
• Building sequences
• Binding tween lifetime
• Debugging tween pitfalls
• 编写或审查 DOTween 代码、构建序列动画、绑定补间生命周期、排查补间陷阱

DOTween - Design Rules

Advisory module. Every rule is distilled from Demigiant DOTween source at:

• **1.3.015** — bundled in `_DOTween.Assembly/DOTween/` and `bin/Modules/` module files (Unity 2018+)

Each rule cites a concrete file/line so the reasoning is auditable and the AI does not improvise against stale memory.

> **Mode**: Documentation only — no REST skills to gate; load freely under any operating mode (Approval / Auto / Bypass).

When to Load This Module

Load before writing or reviewing any of:

• `DOTween.Init(...)` bootstrap, DOTweenSettings configuration, SetTweensCapacity adjustments
• Any `.DOMove / .DORotate / .DOScale / .DOColor / .DOFade / .DOShake* / .DOPath / .DOPunch*` shortcut call
• `DOTween.Sequence()` + `.Append / .Join / .Insert / .Prepend / .AppendInterval / .PrependInterval / .AppendCallback`
• `.SetEase / .SetDelay / .SetLoops / .SetAutoKill / .SetLink / .SetId / .SetTarget / .SetUpdate / .SetRelative / .SetRecyclable / .SetSpeedBased`
• `.OnStart / .OnUpdate / .OnStepComplete / .OnComplete / .OnKill / .OnPlay / .OnPause / .OnRewind`
• `.AsyncWaitForCompletion / .AsyncWaitForKill / .AsyncWaitForRewind / .AsyncWaitForElapsedLoops / .AsyncWaitForPosition`
• `tween.ToUniTask(TweenCancelBehaviour, CancellationToken)` (UniTask bridge)
• `DOTween.Kill(target, complete)` / `DOTween.KillAll()` batch operations
• Safe Mode debugging — `useSafeMode`, `safeModeLogBehaviour`, `nestedTweenFailureBehaviour`
• DOTween Module generation (Audio / Physics / Physics2D / Sprite / UI / UnityUI / TextMeshPro)

Critical Rule Summary

| # | Rule | Source anchor | |---|------|---------------| | 1 | `DOTween.Init(recycleAllByDefault, useSafeMode, logBehaviour)` returns `IDOTweenInit` for fluent `.SetCapacity(...)`. If not called explicitly, Auto-init runs on first tween creation (`AutoInit` at `DOTween.cs:236`). `DOTween.Version = "1.3.015"` is exposed as a const. | `DOTween.cs:38,227,236,243` | | 2 | Every tween is driven by a single `[DOTween]` GameObject MonoBehaviour (`DOTweenComponent`) marked `DontDestroyOnLoad`. It is created on first init and survives scene loads. Don't destroy it — `DOTween.Clear(destroy: true)` is the only supported teardown. | `DOTweenComponent.cs:268-270`, `DOTween.cs:311` | | 3 | **Default `autoKill = true`**: tween is killed on completion. After kill, calls like `.Restart()` / `.Kill()` / `.Complete()` are no-ops (Safe Mode) or NullReferenceException (Safe Mode off). Use `.SetAutoKill(false)` to keep tween alive for replay. | `DOTween.cs useSafeMode:49`, `TweenSettingsExtensions.cs:39,49` | | 4 | **Safe Mode is ON by default** (`useSafeMode = true`). Target destroyed while tween plays → Safe Mode catches the exception and logs per `safeModeLogBehaviour` (default: Warning). Disable Safe Mode to locate missing-link bugs during development. | `DOTween.cs:49,51` | | 5 | `SetLink(gameObject, LinkBehaviour)` binds tween lifecycle to a GameObject. Default `LinkBehaviour.KillOnDestroy`. Without `SetLink`, tween continues running after target is destroyed and relies on Safe Mode for protection. | `TweenSettingsExtensions.cs:91,103`, `LinkBehaviour.cs` | | 6 | `SetTarget(object target)` is required for `DOTween.Kill(target)` / `DOTween.KillAll(target)` grouping. Shortcut extensions (`.DOMove`, `.DOFade`, etc.) set target automatically; manual `DOTween.To(...)` does NOT. | `TweenSettingsExtensions.cs:116`, `DOTween.cs:884,892` | | 7 | `Sequence.Append(t)` runs after previous. `Sequence.Join(t)` runs in parallel with previous. `Sequence.Insert(float atPosition, t)` inserts at absolute time. `Sequence.Prepend(t)` pushes to front, shifting existing. | `TweenSettingsExtensions.cs:499,508,517,528` | | 8 | `AsyncWaitForCompletion / AsyncWaitForKill / AsyncWaitForRewind` live in `DOTweenModuleUnityVersion.cs` (MODULE file, gated by `UNITY_2018_1_OR_NEWER && (NET_4_6 || NET_STANDARD_2_0)`). If Modules are not generated (Tools → DOTween Utility Panel → Create ASMDEF), these APIs don't exist. | `bin/Modules/DOTweenModuleUnityVersion.cs:216,244,230` | | 9 | UniTask bridge `tween.ToUniTask(TweenCancelBehaviour, CancellationToken)` lives in UniTask's `External/DOTween/` extensions and is the **recommended** await path over `AsyncWaitForCompletion`. `TweenCancelBehaviour` has 9 values (Kill / Complete / CancelAwait / KillAndCancelAwait / ...). | UniTask `DOTweenAsyncExtensions.cs:14-27,54` | | 10 | `Ease` enum has **38 entries** (36 user-facing + 2 reserved `INTERNAL_*`): `Unset / Linear` + In/Out/InOut variants of Sine/Quad/Cubic/Quart/Quint/Expo/Circ/Elastic/Back/Bounce (10 × 3 = 30 math eases) + `Flash / InFlash / OutFlash / InOutFlash`. `INTERNAL_Zero` and `INTERNAL_Custom` are auto-assigned by DOTween for zero-duration and AnimationCurve-based tweens. | `Ease.cs:9-53` |

Sub-doc Routing

| Sub-doc | When to read | |---------|--------------| | [BASICS.md](./BASICS.md) | `DOTween.Init`, driver GameObject, DOTweenSettings asset, Modules architecture, Safe Mode, tween capacity | | [TWEEN.md](./TWEEN.md) | Tween base class, Tweener vs Sequence, autoKill, Play/Pause/Rewind/Restart/Kill/Complete/Goto lifecycle | | [SEQUENCE.md](./SEQUENCE.md) | `Sequence.Append / Join / Insert / Prepend / AppendInterval / PrependInterval / AppendCallback / InsertCallback`, nesting, loop composition | | [SHORTCUTS.md](./SHORTCUTS.md) | `.DOMove / DOLocalMove / DOAnchorPos / DORotate / DOScale / DO