added ability to delete abstract products

app/src/main/java/org/foxarmy/barcodescannerforemployees/AbstractProduct.kt

@@ -1,5 +1,11 @@
 package org.foxarmy.barcodescannerforemployees
 
-class AbstractProduct constructor(name:String, netWeight: Double, imageFile: String, type: Int) {
+class AbstractProduct(
+    public var id: Int,
+    public var name: String,
+    public var netWeight: Double,
+    public var imageHash: String,
+    public var category: Int
+) {
 
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/DBStorageController.kt

@@ -4,6 +4,8 @@ import android.content.Context
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
 import android.provider.BaseColumns
+import android.util.Log
+import java.io.File
 
 object ProductContract {
     object ProductEntry : BaseColumns {
@@ -57,8 +59,44 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         TODO("Not yet implemented")
     }
 
+    public fun eraseAbstractProduct(db: SQLiteDatabase, id: Int, context: Context) {
+        val projection = arrayOf(BaseColumns._ID,
+            ProductContract.ProductEntry.IMAGE_FILENAME
+        )
+
+//        val cursor = db.query(ProductContract.ProductEntry.TABLE_NAME, projection, null, , null, null, null)
+        val selection = "${BaseColumns._ID} = ?"
+        val selectionArgs = arrayOf(id.toString())
+        val cursor = db.query(
+            ProductContract.ProductEntry.TABLE_NAME,
+            projection,
+            selection,
+            selectionArgs,
+            null,
+            null,
+            null
+        )
+//        val cursor = db.rawQuery("SELECT image_filename FROM ${ProductContract.ProductEntry.TABLE_NAME} WHERE ${BaseColumns._ID}=$id", null)
+        var imageHash: String = ""
+
+        with (cursor) {
+            while(moveToNext()) {
+                val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
+                val productImageHash = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.IMAGE_FILENAME))
+                imageHash = productImageHash
+            }
+        }
+        Log.d("QWERTYUIOP", "Deleting image with hash: $imageHash and $id")
+        val picturesDir = File(context.filesDir, "pictures")
+        val thumbnailsDir = File(context.cacheDir, "thumbnails")
+
+        File(picturesDir, "$imageHash.png").delete()
+        File(thumbnailsDir, "$imageHash.webp").delete()
+        Log.d("QWERTYUIOP", BaseColumns._ID + "=" + id)
+        db.delete(ProductContract.ProductEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
+    }
+
     companion object {
-        // If you change the database schema, you must increment the database version.
         const val DATABASE_VERSION = 1
         const val DATABASE_NAME = "database.db"
     }

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/StorageActivity.kt

@@ -2,16 +2,22 @@ package org.foxarmy.barcodescannerforemployees.activities
 
 import android.content.Intent
 import android.os.Bundle
+import android.util.Log
 import android.view.Menu
 import android.view.MenuItem
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
+import androidx.core.view.children
+import androidx.gridlayout.widget.GridLayout
 import androidx.navigation.findNavController
 import androidx.navigation.ui.AppBarConfiguration
 import androidx.navigation.ui.navigateUp
 import androidx.navigation.ui.setupActionBarWithNavController
+import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.databinding.ActivityStorageBinding
+import org.foxarmy.barcodescannerforemployees.fragments.StorageFragment
+import org.foxarmy.barcodescannerforemployees.views.AbstractProductView
 
 class StorageActivity : AppCompatActivity() {
 
@@ -47,6 +53,21 @@ class StorageActivity : AppCompatActivity() {
             R.id.action_settings -> {
                 true
             }
+            R.id.action_delete -> {
+                // if there's no selected items, write a toast about it, otherwise delete those items.
+                val storageFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment_content_storage)?.childFragmentManager!!.fragments[0] as StorageFragment
+                val amountOfViews = storageFragment.view?.findViewById<GridLayout>(R.id.contentGridLayout)?.childCount
+
+                for (view: AbstractProductView in storageFragment.view?.findViewById<GridLayout>(R.id.contentGridLayout)?.children!!.iterator() as Iterator<AbstractProductView>) {
+                    val db = DBStorageController(this)
+                    if (view.isProductSelected) {
+                        db.eraseAbstractProduct(db.writableDatabase , view.product.id, this)
+                        Log.d("QWERTYUIOP", "Removing ${view.product.id}")
+                    }
+                }
+                storageFragment.updateContent()
+                true
+            }
             else -> super.onOptionsItemSelected(item)
         }
     }

app/src/main/java/org/foxarmy/barcodescannerforemployees/fragments/StorageFragment.kt

@@ -2,7 +2,6 @@ package org.foxarmy.barcodescannerforemployees.fragments
 
 import android.os.Bundle
 import android.provider.BaseColumns
-import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -18,6 +17,8 @@ import org.foxarmy.barcodescannerforemployees.views.AbstractProductView
  */
 class StorageFragment : Fragment() {
 
+    public var test_value = 1
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
     }
@@ -33,10 +34,10 @@ class StorageFragment : Fragment() {
     override fun onResume() {
         super.onResume()
 
-        refillWithContent()
+        updateContent()
     }
 
-    public fun refillWithContent() {
+    public fun updateContent() {
 
         val grv = getView()?.findViewById<GridLayout>(R.id.contentGridLayout)
         grv?.removeAllViews()
@@ -52,26 +53,21 @@ class StorageFragment : Fragment() {
 
         with (cursor) {
             while(moveToNext()) {
+                val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
                 val productName = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.PRODUCT_NAME))
                 val netWeight = getDouble(getColumnIndexOrThrow(ProductContract.ProductEntry.PRODUCT_NET_WEIGHT))
                 val productImageHash = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.IMAGE_FILENAME))
 
+                val product = AbstractProduct(productId, productName, netWeight, productImageHash, 1)
+
                 generateThumbnailForImage(context!!, productImageHash)
 
                 val abstractProduct = AbstractProductView(
                     requireActivity(),
                     requireContext(),
-                    productImageHash,
-                    productName,
-                    netWeight,
-                    1
+                    product
                 )
                 grv?.addView(abstractProduct)
-
-                abstractProduct.setOnClickListener {
-                    Log.d("QWERTYUIOP", "Clicked view")
-                }
-//                getView()?.findViewById<GridView>(R.id.contentGridLayout)?
             }
         }
     }
@@ -79,6 +75,6 @@ class StorageFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        refillWithContent()
+        updateContent()
     }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/views/AbstractProductView.kt

@@ -4,7 +4,6 @@ import android.app.Activity
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
-import android.util.Log
 import android.view.LayoutInflater
 import android.widget.ImageView
 import android.widget.LinearLayout
@@ -12,6 +11,7 @@ import android.widget.TextView
 import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.core.content.ContextCompat
 import androidx.core.content.ContextCompat.startActivity
+import org.foxarmy.barcodescannerforemployees.AbstractProduct
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.activities.FullscreenActivity
 import org.foxarmy.barcodescannerforemployees.getImageUri
@@ -24,9 +24,12 @@ class AbstractProductView: LinearLayout {
     private var netWeightField: TextView
     private var categoryField: TextView
     private var unitField: TextView
+    public var product: AbstractProduct
     var isProductSelected = false
 
-    constructor(activity: Activity, context: Context, productImageHash: String, productName: String, netWeight: Double, category: Int) : super(context) {
+    constructor(activity: Activity, context: Context, product: AbstractProduct) : super(context) {
+
+        this.product = product
 
         val inflater:LayoutInflater = activity.layoutInflater
         inflater.inflate(R.layout.abstract_product_view, this)
@@ -40,14 +43,13 @@ class AbstractProductView: LinearLayout {
 
         val thumbnailsDir = File(context.cacheDir, "thumbnails")
         thumbnailsDir.mkdirs()
-        val imageUri = getImageUri(activity, File(thumbnailsDir, "$productImageHash.webp"))
+        val imageUri = getImageUri(activity, File(thumbnailsDir, "${product.imageHash}.webp"))
         productPicture.setImageURI(imageUri)
         productPicture.rotation = 90f
         productPicture.setOnClickListener {
-            Log.d("QWERTYUIOP", productImageHash)
             val fullscreenIntent = Intent(activity, FullscreenActivity::class.java)
             val extras = Bundle()
-            extras.putString("imagehash", productImageHash)
+            extras.putString("imagehash", product.imageHash)
             fullscreenIntent.putExtras(extras)
             startActivity(context, fullscreenIntent, extras)
         }
@@ -56,8 +58,8 @@ class AbstractProductView: LinearLayout {
 
         }
 
-        productNameField.text = productName
-        netWeightField.text = netWeight.toString()
+        productNameField.text = product.name
+        netWeightField.text = product.netWeight.toString()
 
         //TODO: category and units
 

app/src/main/res/menu/menu_main.xml

@@ -6,5 +6,5 @@
           android:title="@string/action_settings"
           android:orderInCategory="100"
           app:showAsAction="never"/>
-    <item android:title="Delete item..." android:id="@+id/action_delete"/>
+    <item android:id="@+id/action_delete" android:title="@string/delete_menu"/>
 </menu>

app/src/main/res/values/strings.xml

@@ -53,4 +53,5 @@
         libero vel nunc consequat, quis tincidunt nisl eleifend. Cras bibendum enim a justo luctus vestibulum. Fusce
         dictum libero quis erat maximus, vitae volutpat diam dignissim.
     </string>
+    <string name="delete_menu">Delete item(s)...</string>
 </resources>