Maxsus ko'rinishda (CustomView) to'rt quruvchini…

Fabrika usul yoki builder pattern ni to'g'ridan-to'g'ri konstruktorlardan foydalanish o'rniga ishlatish mumkin.

Fabrika usuli: Bu, ko'rinish nusxalarini yaratishga imkon beradi, yaratish jarayonini abstraktsiyalash va kerakli konstruktorni tanlash mantiqini yashirish.

class MyCustomView private constructor(
    context: Context,
    attrs: AttributeSet?,
    defStyleAttr: Int,
    defStyleRes: Int
) : View(context, attrs, defStyleAttr, defStyleRes) {

    // Maxfiy konstruktor, fabrik metodlaridan foydalanishni majburiy qilish uchun

    companion object {
        fun createDefault(context: Context): MyCustomView {
            // Standart konstruktor uchun boshlang'ich mantiq
            return MyCustomView(context, null, 0, 0)
        }

        fun createFromAttrs(context: Context, attrs: AttributeSet?): MyCustomView {
            // atributlar bilan boshlang'ich mantiq
            return MyCustomView(context, attrs, 0, 0)
        }

        // Boshqa konstruktor kombinatsiyalari uchun fabrik metodlar
    }
}

Builder pattern: Bu, agar ko'plab konstruktorlar yoki ko'p miqdordagi ixtiyoriy parametrlar bo'lsa, foydalidir. Ob'ektni bosqichma-bosqich yaratishga imkon beradi.

class MyCustomView private constructor(
    private val context: Context,
    private val attrs: AttributeSet?,
    private val defStyleAttr: Int,
    private val defStyleRes: Int
) : View(context, attrs, defStyleAttr, defStyleRes) {

    // Maxfiy konstruktor

    class Builder(private val context: Context) {
        private var attrs: AttributeSet? = null
        private var defStyleAttr: Int = 0
        private var defStyleRes: Int = 0

        fun setAttrs(attrs: AttributeSet?) = apply { this.attrs = attrs }
        fun setDefStyleAttr(defStyleAttr: Int) = apply { this.defStyleAttr = defStyleAttr }
        fun setDefStyleRes(defStyleRes: Int) = apply { this.defStyleRes = defStyleRes }

        fun build(): MyCustomView {
            // Mantiqiy yaratish va boshlash
            return MyCustomView(context, attrs, defStyleAttr, defStyleRes)
        }
    }
}

// Builderdan foydalanish
val myView = MyCustomView.Builder(context)
    .setAttrs(attrs)
    .build()

Fabrik metod va builder pattern o'rtasidagi tanlov, ko'rinishni boshlashning murakkabligiga bog'liq. Oddiy holatlar uchun fabrik metodlar etarli. Murakkab holatlar uchun, ko'p variantli bo'lsa, builder afzallik beradi.

Maxsus ko'rinishda (CustomView) to'rt quruvchini qanday olib tashlash mumkin?