PixelDroid-App-Android/app/src/main/java/com/h/pixeldroid/MainActivity.kt

package com.h.pixeldroid

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import android.view.View
import androidx.annotation.NonNull
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.appcompat.widget.Toolbar
import androidx.core.view.GravityCompat
import androidx.drawerlayout.widget.DrawerLayout
import com.google.android.material.navigation.NavigationView
import com.h.pixeldroid.settings.ui.*

class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener {

    private lateinit var drawerLayout: DrawerLayout

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val toolbar : Toolbar = findViewById(R.id.toolbar)
        setSupportActionBar(toolbar)

        drawerLayout = findViewById(R.id.drawer_layout)
        val navigationView: NavigationView = findViewById(R.id.nav_view)
        navigationView.setNavigationItemSelectedListener(this)

        val toggle = ActionBarDrawerToggle(this, drawerLayout, toolbar,
            R.string.navigation_drawer_open, R.string.navigation_drawer_close)
        drawerLayout.addDrawerListener(toggle)
        toggle.syncState()

        // On startup ONLY, start at the account settings
        if(savedInstanceState == null) {
            supportFragmentManager.beginTransaction().replace(R.id.fragment_container,
                AccountFragment()).commit()
            navigationView.setCheckedItem(R.id.nav_account)
        }
    }

    /*
    On click go to the corresponding activity
     */
    override fun onNavigationItemSelected(@NonNull item: MenuItem): Boolean {
        when (item.itemId){
            R.id.nav_account -> supportFragmentManager.beginTransaction().replace(R.id.fragment_container,
                AccountFragment()).commit()
            R.id.nav_accessibility -> supportFragmentManager.beginTransaction().replace(R.id.fragment_container,
                AccessibilityFragment()).commit()
            R.id.nav_settings -> supportFragmentManager.beginTransaction().replace(R.id.fragment_container,
                SettingsFragment()).commit()
        }

        drawerLayout.closeDrawer(GravityCompat.START)

        return true
    }

    /*
    Makes it possible to drag the settings menu from the left
     */
    override fun onBackPressed() {
        if(drawerLayout.isDrawerOpen(GravityCompat.START)){
            drawerLayout.closeDrawer(GravityCompat.START)
        } else {
            super.onBackPressed()
        }
    }
}