1 files changed, 0 insertions, 105 deletions
diff --git a/public/bluebey-studio/src/history.js b/public/bluebey-studio/src/history.js
deleted file mode 100644
index d988b50..0000000
--- a/public/bluebey-studio/src/history.js
+++ /dev/null
@@ -1,105 +0,0 @@
-/**
- * Undo / redo for the whole studio state.
- *
- * The studio is a big pile of sliders, and before this every experiment was
- * one-way: nudging the wrong slider meant dialling the old value back by hand.
- * A history of whole-state snapshots is the simplest thing that can possibly
- * work here, because the state is already the single source of truth and every
- * control funnels through `applyState`.
- *
- * Two details matter for it to feel right rather than merely correct:
- *
- *  - Dragging a slider fires an event per pixel, which would bury the history in
- *    hundreds of near-identical entries. Entries therefore carry a label, and a
- *    new entry with the *same* label within `coalesceMs` REPLACES the previous
- *    one instead of stacking on top of it. So a whole drag becomes one step.
- *
- *  - `view.backgroundImage` can be a multi-megabyte data URL, and `state` also
- *    holds the caption text. The snapshots copy objects by hand rather than via
- *    `JSON.parse(JSON.stringify(...))`, because assigning a string in JavaScript
- *    shares it instead of duplicating it - so a hundred snapshots of a heavy
- *    state stay cheap.
- */
-
-const SHALLOW_TYPES = new Set(['string', 'number', 'boolean', 'undefined']);
-
-/** Deep copy that shares string data (and handles the odd null/array). */
-function copy(value) {
-  if (value === null || SHALLOW_TYPES.has(typeof value)) return value;
-  if (Array.isArray(value)) return value.map(copy);
-  if (typeof value === 'object') {
-    const out = {};
-    for (const [key, inner] of Object.entries(value)) out[key] = copy(inner);
-    return out;
-  }
-  return value;   // functions, symbols: not part of the saved state
-}
-
-export class History {
-  constructor({ limit = 120, coalesceMs = 700, onChange = null } = {}) {
-    this.limit = Math.max(2, limit);
-    this.coalesceMs = coalesceMs;
-    this.onChange = onChange;
-    /** @type {{ state: object, label: string, at: number }[]} */
-    this.entries = [];
-    this.index = -1;
-  }
-
-  /** Forget everything and start from `state` (call after load/reset). */
-  reset(state, label = 'start') {
-    this.entries = [{ state: copy(state), label, at: Date.now() }];
-    this.index = 0;
-    this.onChange?.(this);
-  }
-
-  get canUndo() { return this.index > 0; }
-  get canRedo() { return this.index >= 0 && this.index < this.entries.length - 1; }
-
-  /** Label of the step undo would jump to, for the button tooltip. */
-  get undoLabel() { return this.canUndo ? this.entries[this.index].label : null; }
-  get redoLabel() { return this.canRedo ? this.entries[this.index + 1].label : null; }
-
-  /**
-   * Record the state *after* a change. Repeating the same label in quick
-   * succession (a slider drag) keeps a single entry that follows the value.
-   */
-  push(state, label = '変更') {
-    const now = Date.now();
-    const top = this.entries[this.index];
-    const sameDrag = top
-      && top.label === label
-      && now - top.at <= this.coalesceMs
-      && this.index === this.entries.length - 1;
-
-    if (sameDrag) {
-      this.entries[this.index] = { state: copy(state), label, at: now };
-    } else {
-      this.entries.length = this.index + 1;
-      this.entries.push({ state: copy(state), label, at: now });
-      if (this.entries.length > this.limit) this.entries.shift();
-      this.index = this.entries.length - 1;
-    }
-    this.onChange?.(this);
-    return this;
-  }
-
-  /** The previous snapshot, or `null` when there is nothing to go back to. */
-  undo() {
-    if (!this.canUndo) return null;
-    this.index -= 1;
-    this.onChange?.(this);
-    return copy(this.entries[this.index].state);
-  }
-
-  redo() {
-    if (!this.canRedo) return null;
-    this.index += 1;
-    this.onChange?.(this);
-    return copy(this.entries[this.index].state);
-  }
-
-  /** A plain description of where we are, for tests and debug output. */
-  describe() {
-    return this.entries.map((entry, i) => `${i === this.index ? '*' : ' '}${entry.label}`).join(' | ');
-  }
-}