Talentica/AndroidWithKotlin

/*
 * Copyright 2017, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.talentica.androidkotlin

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.databinding.DataBindingUtil
import androidx.fragment.app.Fragment
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.ViewModelProviders
import com.talentica.androidkotlin.databinding.ListFragmentBinding
import com.talentica.androidkotlin.model.Product
import com.talentica.androidkotlin.ui.ProductAdapter
import com.talentica.androidkotlin.ui.ProductClickCallback
import com.talentica.androidkotlin.viewmodel.ProductListViewModel

class ProductListFragment : Fragment() {
    private var mProductAdapter: ProductAdapter? = null
    private lateinit var mBinding: ListFragmentBinding
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        mBinding = DataBindingUtil.inflate(inflater, R.layout.list_fragment, container, false)
        mProductAdapter = ProductAdapter(mProductClickCallback)
        mBinding.productsList.adapter = mProductAdapter
        return mBinding.root
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        val viewModel = ViewModelProviders.of(this).get(
            ProductListViewModel::class.java
        )
        subscribeUi(viewModel)
    }

    private fun subscribeUi(viewModel: ProductListViewModel) {
        // Update the list when the data changes
        viewModel.products?.observe(viewLifecycleOwner, { myProducts ->
            if (myProducts != null) {
                mBinding.isLoading = false
                mProductAdapter!!.setProductList(myProducts)
            } else {
                mBinding.isLoading = true
            }
        })
    }

    private val mProductClickCallback = object : ProductClickCallback {
        override fun onClick(product: Product) {
            if (lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)) {
                (activity as MainActivity?)!!.show(product)
            }
        }
    }

    companion object {
        const val TAG = "ProductListViewModel"
    }
}