enable add button only when you select contacts

Signed-off-by: sowjanyakch <sowjanya.kch@gmail.com>

app/src/main/java/com/nextcloud/talk/contacts/ContactsScreen.kt

@@ -29,6 +29,7 @@ fun ContactsScreen(contactsViewModel: ContactsViewModel, uiState: ContactsUiStat
     val isSearchActive by contactsViewModel.isSearchActive.collectAsStateWithLifecycle()
     val isAddParticipants by contactsViewModel.isAddParticipantsView.collectAsStateWithLifecycle()
     val autocompleteUsers by contactsViewModel.selectedParticipantsList.collectAsStateWithLifecycle()
+    val enableAddButton by contactsViewModel.enableAddButton.collectAsStateWithLifecycle()
 
     Scaffold(
         topBar = {
@@ -49,7 +50,8 @@ fun ContactsScreen(contactsViewModel: ContactsViewModel, uiState: ContactsUiStat
                 },
                 onUpdateAutocompleteUsers = {
                     contactsViewModel.getContactsFromSearchParams()
-                }
+                },
+                enableAddButton = enableAddButton
             )
         },
         content = {

app/src/main/java/com/nextcloud/talk/contacts/ContactsViewModel.kt

@@ -36,6 +36,11 @@ class ContactsViewModel @Inject constructor(
     private val _isAddParticipantsView = MutableStateFlow(false)
     val isAddParticipantsView: StateFlow<Boolean> = _isAddParticipantsView
 
+    private val _enableAddButton = MutableStateFlow(false)
+    val enableAddButton: StateFlow<Boolean> = _enableAddButton
+
+    private val _selectedContacts = MutableStateFlow<List<AutocompleteUser>>(emptyList())
+
     private var hideAlreadyAddedParticipants: Boolean = false
 
     init {
@@ -49,11 +54,21 @@ class ContactsViewModel @Inject constructor(
     fun selectContact(contact: AutocompleteUser) {
         val updatedParticipants = selectedParticipants.value + contact
         selectedParticipants.value = updatedParticipants
+        _selectedContacts.value = _selectedContacts.value + contact
+    }
+
+    fun updateAddButtonState()  {
+        if (_selectedContacts.value.isEmpty()) {
+            _enableAddButton.value = false
+        } else {
+            _enableAddButton.value = true
+        }
     }
 
     fun deselectContact(contact: AutocompleteUser) {
         val updatedParticipants = selectedParticipants.value - contact
         selectedParticipants.value = updatedParticipants
+        _selectedContacts.value = _selectedContacts.value - contact
     }
 
     fun updateSelectedParticipants(participants: List<AutocompleteUser>) {

app/src/main/java/com/nextcloud/talk/contacts/components/AppBar.kt

@@ -42,7 +42,8 @@ fun AppBar(
     onEnableSearch: () -> Unit,
     onDisableSearch: () -> Unit,
     onUpdateSearchQuery: (String) -> Unit,
-    onUpdateAutocompleteUsers: () -> Unit
+    onUpdateAutocompleteUsers: () -> Unit,
+    enableAddButton: Boolean
 ) {
     val context = LocalContext.current
 
@@ -96,11 +97,11 @@ fun AppBar(
                     onClick = {
                         onDisableSearch()
                         onUpdateSearchQuery("")
-                    }
+                    },
+                    enabled = enableAddButton
                 ) {
                     Text(text = context.getString(R.string.add_participants))
                 }
-            } else {
             }
         }
     }

app/src/main/java/com/nextcloud/talk/contacts/components/ContactItemRow.kt

@@ -65,8 +65,10 @@ fun ContactItemRow(contact: AutocompleteUser, contactsViewModel: ContactsViewMod
                         isSelected = !isSelected
                         if (isSelected) {
                             contactsViewModel.selectContact(contact)
+                            contactsViewModel.updateAddButtonState()
                         } else {
                             contactsViewModel.deselectContact(contact)
+                            contactsViewModel.updateAddButtonState()
                         }
                     }
                 }

app/src/main/java/com/nextcloud/talk/contacts/components/SearchComponent.kt

@@ -109,9 +109,3 @@ fun searchKeyboardActions(text: String, keyboardController: SoftwareKeyboardCont
             }
         }
     )
-
-class SearchComponentCompanionClass {
-    companion object {
-        const val WIDTH_RATIO = 0.85f
-    }
-}