658c92f94d
- CommandHistory class with execute/undo/redo, 50-step max, redo-clear on new action
- PlaceBlockCommand, MoveBlockCommand, ResizeBlockCommand, DeleteBlockCommand
- setCurrentShowId() module-level function for backend sync routing
- syncBlock() fire-and-forget fetch helper for backend sync
- POST/PATCH/DELETE /api/shows/{show_id}/tracks/{device_id}/blocks endpoints
- timeline router registered in main.py with prefix=/api
37 lines
1020 B
JavaScript
37 lines
1020 B
JavaScript
// CommandHistory — undo/redo stack for timeline block mutations
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// Supports min 50 steps. execute() clears redo stack to prevent branching corruption.
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export class CommandHistory {
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constructor(maxSteps = 50) {
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this.undoStack = [];
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this.redoStack = [];
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this.maxSteps = maxSteps;
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}
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execute(cmd) {
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cmd.execute();
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this.undoStack.push(cmd);
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if (this.undoStack.length > this.maxSteps) this.undoStack.shift();
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this.redoStack = []; // clear redo on new action (prevents branching corruption)
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}
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undo() {
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const cmd = this.undoStack.pop();
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if (!cmd) return false;
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cmd.undo();
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this.redoStack.push(cmd);
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return true;
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}
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redo() {
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const cmd = this.redoStack.pop();
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if (!cmd) return false;
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cmd.execute();
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this.undoStack.push(cmd);
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return true;
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}
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get canUndo() { return this.undoStack.length > 0; }
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get canRedo() { return this.redoStack.length > 0; }
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}
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