ability to delete a product

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

@@ -123,6 +123,10 @@ class MainActivity : AppCompatActivity() {
 
                             }.show()
                     }
+                    "ShelfFragment" -> {
+                        val shelfFragment = fragment as ShelfFragment
+                        shelfFragment.removeSelected()
+                    }
                 }
                 true
             }

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

@@ -5,6 +5,9 @@ import android.provider.BaseColumns
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.ImageView
+import android.widget.Toast
+import androidx.core.view.children
 import androidx.fragment.app.Fragment
 import androidx.gridlayout.widget.GridLayout
 import org.foxarmy.barcodescannerforemployees.DBStorageController
@@ -77,4 +80,30 @@ class ShelfFragment : Fragment() {
             }
         }
     }
+
+    fun removeSelected() {
+        thread {
+            val grv = view?.findViewById<GridLayout>(R.id.contentGridLayout)
+
+            val db = DBStorageController(requireContext())
+            var deleted = false
+            for (view: ProductView in grv?.children!!.iterator() as Iterator<ProductView>) {
+                activity!!.runOnUiThread {
+                    view.findViewById<ImageView>(R.id.productPicture).setImageURI(null)
+                }
+                if (view.isProductSelected) {
+//                    db.eraseAbstractProduct(db.writableDatabase, view.abstractProduct.id, requireContext())
+                    db.eraseProduct(db.writableDatabase, view.product.id)
+                    deleted = true
+                }
+            }
+
+            if (!deleted) {
+                activity!!.runOnUiThread {
+                    Toast.makeText(requireContext(), "Nothing to delete", Toast.LENGTH_SHORT).show()
+                }
+            }
+            updateContent()
+        }
+    }
 }

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

@@ -61,6 +61,7 @@ class ProductView: LinearLayout {
         productLifeSpan = findViewById(R.id.dateSpan)
 
         findViewById<ConstraintLayout>(R.id.productLayout).setOnLongClickListener {
+            isProductSelected = !isProductSelected
             updateStroke()
             true
         }

app/src/main/res/drawable/outline.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
     <solid android:color="@android:color/transparent" />
-    <stroke android:width="1dip" android:color="#28283f" android:id="@+id/test"/>
+    <stroke android:width="3dip" android:color="#28283f" android:id="@+id/test"/>
     <padding android:bottom="1dp" android:top="1dp" android:left="1dp" android:right="1dp" />
 </shape>

app/src/main/res/drawable/outline_selected.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
     <solid android:color="@android:color/transparent" />
-    <stroke android:width="1dip" android:color="#840d15"/>
+    <stroke android:width="3dip" android:color="#840d15"/>
     <padding android:bottom="1dp" android:top="1dp" android:left="1dp" android:right="1dp" />
 </shape>