2024/4/11

跟着教程写todoapplication

package com.example.to_do_application.fragments.update

import android.app.AlertDialog
import android.os.Bundle
import android.view.*
import android.widget.Toast
import androidx.fragment.app.Fragment
import androidx.fragment.app.viewModels
import androidx.navigation.fragment.findNavController
import androidx.navigation.fragment.navArgs
import com.example.to_do_application.R
import com.example.to_do_application.data.models.Priority
import com.example.to_do_application.data.models.ToDoData
import com.example.to_do_application.data.viewmodel.ToDoViewModel
import com.example.to_do_application.databinding.FragmentUpdateBinding
import com.example.to_do_application.fragments.SharedViewModel

class UpdateFragment : Fragment() {

    private val args by navArgs<UpdateFragmentArgs>()

    private val mSharedViewModel: SharedViewModel by viewModels()
    private val mToDoViewModel: ToDoViewModel by viewModels()

    private var _binding: FragmentUpdateBinding? = null
    private val binding get() = _binding!!


    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Data Binding
        _binding = FragmentUpdateBinding.inflate(inflater,container,false)
        binding.args = args

        //setMenu
        setHasOptionsMenu(true)

        //Spinner Item Selected Listener
        binding.currentSpinner.onItemSelectedListener = mSharedViewModel.listener

        return binding.root
    }

    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
        inflater.inflate(R.menu.update_fragment_menu,menu)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean{
        when(item.itemId){
            R.id.menu_save -> updateItem()
            R.id.menu_delete -> confirmItemRemoval()
        }
        return super.onOptionsItemSelected(item)
    }


    private fun updateItem() {
        val mTitle = binding.currentTitleEt.text.toString()
        val mDescription = binding.currentEditTextTextMultiLine.text.toString()
        val mPriority = binding.currentSpinner.selectedItem.toString()

        val validation = mSharedViewModel.verifyDataFromUser(mTitle,mDescription)
        if(validation){
            //Update CurrentItem
            val updateItem = ToDoData(
                args.currentItem.id,
                mTitle,
                mSharedViewModel.parsePriority(mPriority),
                mDescription
            )
            mToDoViewModel.updateData(updateItem)
            Toast.makeText(requireContext(),"Successfully update!", Toast.LENGTH_SHORT).show()
            //Navigation back
            findNavController().navigate(R.id.action_updateFragment_to_listFragment)
        }else {
            Toast.makeText(requireContext(),"Pleas fill out all fields!", Toast.LENGTH_SHORT).show()
        }
    }

    //Show AlertDialog to Confirm item Removal
    private fun confirmItemRemoval() {
        val builder = AlertDialog.Builder(requireContext())
        builder.setPositiveButton("Yes"){_,_ ->
            mToDoViewModel.deleteData(args.currentItem)
            Toast.makeText(
                requireContext(),
                "Successfully Removed:${args.currentItem.tile}",
                Toast.LENGTH_SHORT
            ).show()
            findNavController().navigate(R.id.action_updateFragment_to_listFragment)
        }
        builder.setNegativeButton("No"){_,_ -> }
        builder.setTitle("Delete '${args.currentItem.tile}'?")
        builder.setMessage("Are you sure you want to remove '${args.currentItem.tile}'?")
        builder.create().show()
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }

}