move the notes in a viewpager

app/src/main/kotlin/com/simplemobiletools/notes/Constants.kt

@@ -1,6 +1,7 @@
 package com.simplemobiletools.notes
 
 val TEXT = "text"
+val NOTE_ID = "note_id"
 
 // shared preferences
 val PREFS_KEY = "Notes"

app/src/main/kotlin/com/simplemobiletools/notes/activities/MainActivity.kt

@@ -1,34 +1,29 @@
 package com.simplemobiletools.notes.activities
 
-import android.appwidget.AppWidgetManager
-import android.content.ComponentName
-import android.content.Context
 import android.content.Intent
 import android.os.Bundle
-import android.util.TypedValue
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
-import android.view.inputmethod.InputMethodManager
 import com.simplemobiletools.filepicker.dialogs.ConfirmationDialog
 import com.simplemobiletools.filepicker.extensions.toast
 import com.simplemobiletools.filepicker.extensions.value
-import com.simplemobiletools.notes.MyWidgetProvider
 import com.simplemobiletools.notes.R
 import com.simplemobiletools.notes.TYPE_NOTE
+import com.simplemobiletools.notes.adapters.NotesPagerAdapter
 import com.simplemobiletools.notes.databases.DBHelper
 import com.simplemobiletools.notes.dialogs.NewNoteDialog
 import com.simplemobiletools.notes.dialogs.OpenNoteDialog
 import com.simplemobiletools.notes.dialogs.RenameNoteDialog
 import com.simplemobiletools.notes.dialogs.WidgetNoteDialog
-import com.simplemobiletools.notes.extensions.getTextSize
+import com.simplemobiletools.notes.extensions.dpToPx
 import com.simplemobiletools.notes.models.Note
 import kotlinx.android.synthetic.main.activity_main.*
 import kotlinx.android.synthetic.main.fragment_note.*
 
 class MainActivity : SimpleActivity() {
-    private var mCurrentNote: Note? = null
-
+    lateinit var mCurrentNote: Note
+    lateinit var mAdapter: NotesPagerAdapter
     lateinit var mDb: DBHelper
     lateinit var mNotes: List<Note>
 
@@ -38,26 +33,28 @@ class MainActivity : SimpleActivity() {
 
         mDb = DBHelper.newInstance(applicationContext)
         mNotes = mDb.getNotes()
-        updateSelectedNote(config.currentNoteId)
+        mCurrentNote = mNotes[0]
+
+        mAdapter = NotesPagerAdapter(supportFragmentManager, mNotes)
+        view_pager.apply {
+            adapter = mAdapter
+        }
 
         notes_fab.setOnClickListener { displayNewNoteDialog() }
         notes_fab.viewTreeObserver.addOnGlobalLayoutListener {
             val heightDiff = notes_coordinator.rootView.height - notes_coordinator.height
-            notes_fab.visibility = if (heightDiff > dpToPx(this, 200f)) View.INVISIBLE else View.VISIBLE
+            notes_fab.visibility = if (heightDiff > dpToPx(200f)) View.INVISIBLE else View.VISIBLE
         }
     }
 
-    fun dpToPx(context: Context, valueInDp: Float) = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueInDp, context.resources.displayMetrics)
-
     override fun onResume() {
         super.onResume()
         invalidateOptionsMenu()
-        notes_view.setTextSize(TypedValue.COMPLEX_UNIT_PX, applicationContext.getTextSize())
     }
 
     override fun onPause() {
         super.onPause()
-        saveText()
+        mAdapter.saveNote(mCurrentNote.id)
     }
 
     override fun onDestroy() {
@@ -121,30 +118,22 @@ class MainActivity : SimpleActivity() {
     }
 
     private fun displayRenameDialog() {
-        RenameNoteDialog(this, mDb, mCurrentNote!!) {
+        RenameNoteDialog(this, mDb, mCurrentNote) {
             mCurrentNote = it
             current_note_title.text = it.title
         }
     }
 
     private fun updateSelectedNote(id: Int) {
-        saveText()
-        mCurrentNote = mDb.getNote(id)
         mNotes = mDb.getNotes()
-        if (mCurrentNote != null) {
-            config.currentNoteId = id
-            notes_view.setText(mCurrentNote!!.value)
-            current_note_title.text = mCurrentNote!!.title
-        }
-
-        current_note_label.visibility = if (mNotes.size <= 1) View.GONE else View.VISIBLE
+        config.currentNoteId = id
+        notes_view.setText(mCurrentNote.value)
+        current_note_title.text = mCurrentNote.title
         current_note_title.visibility = if (mNotes.size <= 1) View.GONE else View.VISIBLE
-        updateWidget(applicationContext)
     }
 
     fun displayNewNoteDialog() {
         NewNoteDialog(this, mDb) {
-            saveText()
             val newNote = Note(0, it, "", TYPE_NOTE)
             val id = mDb.insertNote(newNote)
             updateSelectedNote(id)
@@ -154,7 +143,7 @@ class MainActivity : SimpleActivity() {
     }
 
     private fun displayDeleteNotePrompt() {
-        val message = String.format(getString(R.string.delete_note_prompt_message), mCurrentNote!!.title)
+        val message = String.format(getString(R.string.delete_note_prompt_message), mCurrentNote.title)
         ConfirmationDialog(this, message) {
             deleteNote()
         }
@@ -164,7 +153,7 @@ class MainActivity : SimpleActivity() {
         if (mNotes.size <= 1)
             return
 
-        mDb.deleteNote(mCurrentNote!!.id)
+        mDb.deleteNote(mCurrentNote.id)
         mNotes = mDb.getNotes()
 
         val firstNoteId = mNotes[0].id
@@ -179,22 +168,6 @@ class MainActivity : SimpleActivity() {
         }
     }
 
-    private fun saveText() {
-        if (mCurrentNote == null)
-            return
-
-        val newText = notes_view.value
-        val oldText = mCurrentNote!!.value
-        if (newText != oldText) {
-            toast(R.string.note_saved)
-            mCurrentNote!!.value = newText
-            mDb.updateNote(mCurrentNote!!)
-        }
-
-        hideKeyboard()
-        updateWidget(applicationContext)
-    }
-
     private fun shareText() {
         val text = notes_view.value
         if (text.isEmpty()) {
@@ -212,20 +185,4 @@ class MainActivity : SimpleActivity() {
             startActivity(Intent.createChooser(this, shareTitle))
         }
     }
-
-    private fun hideKeyboard() {
-        val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
-        imm.hideSoftInputFromWindow(notes_view.windowToken, 0)
-    }
-
-    fun updateWidget(context: Context) {
-        val widgetManager = AppWidgetManager.getInstance(context)
-        val ids = widgetManager.getAppWidgetIds(ComponentName(context, MyWidgetProvider::class.java))
-
-        Intent(context, MyWidgetProvider::class.java).apply {
-            action = AppWidgetManager.ACTION_APPWIDGET_UPDATE
-            putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids)
-            context.sendBroadcast(this)
-        }
-    }
 }

app/src/main/kotlin/com/simplemobiletools/notes/adapters/NotesPagerAdapter.kt

@@ -0,0 +1,38 @@
+package com.simplemobiletools.notes.adapters
+
+import android.os.Bundle
+import android.support.v4.app.Fragment
+import android.support.v4.app.FragmentManager
+import android.support.v4.app.FragmentStatePagerAdapter
+import android.util.SparseArray
+import com.simplemobiletools.notes.NOTE_ID
+import com.simplemobiletools.notes.fragments.NoteFragment
+import com.simplemobiletools.notes.models.Note
+
+class NotesPagerAdapter(fm: FragmentManager, private val notes: List<Note>) : FragmentStatePagerAdapter(fm) {
+    lateinit var fragments: SparseArray<NoteFragment>
+
+    init {
+        fragments = SparseArray(10)
+    }
+
+    override fun getCount() = notes.size
+
+    override fun getItem(position: Int): Fragment {
+        val bundle = Bundle()
+        val id = notes[position].id
+        bundle.putInt(NOTE_ID, id)
+
+        if (fragments.get(position) != null)
+            return fragments[position]
+
+        val fragment = NoteFragment()
+        fragment.arguments = bundle
+        fragments.put(position, fragment)
+        return fragment
+    }
+
+    fun saveNote(pos: Int) {
+        fragments.get(pos)?.saveText()
+    }
+}

app/src/main/kotlin/com/simplemobiletools/notes/extensions/Context.kt

@@ -0,0 +1,30 @@
+package com.simplemobiletools.notes.extensions
+
+import android.appwidget.AppWidgetManager
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.util.TypedValue
+import com.simplemobiletools.notes.*
+
+fun Context.getTextSize() =
+        when (Config.newInstance(this).fontSize) {
+            FONT_SIZE_SMALL -> resources.getDimension(R.dimen.small_text_size)
+            FONT_SIZE_LARGE -> resources.getDimension(R.dimen.large_text_size)
+            FONT_SIZE_EXTRA_LARGE -> resources.getDimension(R.dimen.extra_large_text_size)
+            else -> resources.getDimension(R.dimen.medium_text_size)
+        }
+
+
+fun Context.updateWidget() {
+    val widgetManager = AppWidgetManager.getInstance(this)
+    val ids = widgetManager.getAppWidgetIds(ComponentName(this, MyWidgetProvider::class.java))
+
+    Intent(this, MyWidgetProvider::class.java).apply {
+        action = AppWidgetManager.ACTION_APPWIDGET_UPDATE
+        putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids)
+        sendBroadcast(this)
+    }
+}
+
+fun Context.dpToPx(valueInDp: Float) = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueInDp, resources.displayMetrics)

app/src/main/kotlin/com/simplemobiletools/notes/extensions/context.kt

@@ -1,12 +0,0 @@
-package com.simplemobiletools.notes.extensions
-
-import android.content.Context
-import com.simplemobiletools.notes.*
-
-fun Context.getTextSize() =
-        when (Config.newInstance(this).fontSize) {
-            FONT_SIZE_SMALL -> resources.getDimension(R.dimen.small_text_size)
-            FONT_SIZE_LARGE -> resources.getDimension(R.dimen.large_text_size)
-            FONT_SIZE_EXTRA_LARGE -> resources.getDimension(R.dimen.extra_large_text_size)
-            else -> resources.getDimension(R.dimen.medium_text_size)
-        }

app/src/main/kotlin/com/simplemobiletools/notes/fragments/NoteFragment.kt

@@ -0,0 +1,50 @@
+package com.simplemobiletools.notes.fragments
+
+import android.os.Bundle
+import android.support.v4.app.Fragment
+import android.util.TypedValue
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import com.simplemobiletools.filepicker.extensions.value
+import com.simplemobiletools.notes.NOTE_ID
+import com.simplemobiletools.notes.R
+import com.simplemobiletools.notes.databases.DBHelper
+import com.simplemobiletools.notes.extensions.getTextSize
+import com.simplemobiletools.notes.extensions.updateWidget
+import com.simplemobiletools.notes.models.Note
+import kotlinx.android.synthetic.main.fragment_note.view.*
+
+class NoteFragment : Fragment() {
+    var noteId = 0
+    lateinit var view: ViewGroup
+    lateinit var note: Note
+    lateinit var mDb: DBHelper
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        view = inflater.inflate(R.layout.fragment_note, container, false) as ViewGroup
+        noteId = arguments.getInt(NOTE_ID)
+        mDb = DBHelper.newInstance(context)
+        note = mDb.getNote(noteId) ?: return view
+
+        view.notes_view.setText(note.value)
+        view.current_note_title.text = note.title
+        view.notes_view.setTextSize(TypedValue.COMPLEX_UNIT_PX, context.getTextSize())
+        return view
+    }
+
+    fun saveText() {
+        val newText = view.notes_view.value
+        val oldText = note.value
+        if (newText != oldText) {
+            note.value = newText
+            mDb.updateNote(note)
+            context.updateWidget()
+        }
+    }
+
+    override fun onPause() {
+        super.onPause()
+        saveText()
+    }
+}