33 lines
2.0 KiB
JavaScript
33 lines
2.0 KiB
JavaScript
// A single coordinator for page, module, company and unit transitions.
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// Saving uses the existing form and its existing command/validation path.
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export class ContextTransition {
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constructor() { this.dirty = new Set(); this.pending = 0; this.saved = 0; this.failed = 0; this.versions = new WeakMap(); this.submitting = null; }
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changed(form) { if (form) { this.dirty.add(form); this.versions.set(form,(this.versions.get(form)||0)+1); } }
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prune() { for (const form of this.dirty) if (!form.isConnected) this.dirty.delete(form); }
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async command(operation) {
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this.pending++;
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const form=this.submitting, version=form&&this.versions.get(form);
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try { const result = await operation(); this.saved++; if(form&&version===this.versions.get(form))this.dirty.delete(form); return result; }
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catch (e) { this.failed++; throw e; }
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finally { this.pending--; }
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}
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async save() {
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this.prune();
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for (const form of [...this.dirty]) {
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if (!form.requestSubmit) throw new Error('Este editor exige gravação explícita no próprio percurso. Cancele a mudança, guarde e tente novamente.');
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if (!form.reportValidity()) throw new Error('Corrija os campos antes de mudar de contexto.');
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const saved = this.saved, failed = this.failed;
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const version=this.versions.get(form);
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this.submitting=form;
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form.requestSubmit();
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// React handlers start commands synchronously or after a short validation step.
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await new Promise(resolve => setTimeout(resolve, 100));
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while (this.pending) await new Promise(resolve => setTimeout(resolve, 40));
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if (this.failed !== failed || this.saved === saved) throw new Error('Não foi possível guardar. O contexto foi mantido.');
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if(version!==this.versions.get(form))throw new Error('Existem alterações posteriores à gravação. O contexto foi mantido.');
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this.dirty.delete(form);
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}
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}
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discard() { this.dirty.clear(); }
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}
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