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我需要帮助使行仅在选中复选框时才启用。应该禁用默认行，但是仅选中复选框时，将启用该行。这是我的代码的链接

链接代码

  patchValues() {
    let rows = this.myForm.get('rows') as FormArray;
    this.orders.forEach(material => {
      material.materials.forEach(x => {
      rows.push(this.fb.group({
        checkbox_value: [null],
        material_id:  new FormControl({value: x.id, disabled: true}, Validators.required),
        material_name: x.name, 
        quantity: [null, Validators.required]
      }))
    })
      })

  }