Add placeholder when the editor is empty

Author: LunarX

app/src/main/java/com/infomaniak/mail/ui/newMessage/NewMessageFragment.kt

@@ -41,6 +41,7 @@ import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.findNavController
 import com.infomaniak.lib.core.utils.FilePicker
 import com.infomaniak.lib.core.utils.SnackbarUtils.showSnackbar
@@ -78,6 +79,9 @@ import com.infomaniak.mail.utils.extensions.AttachmentExtensions.openAttachment
 import dagger.hilt.android.AndroidEntryPoint
 import io.sentry.Sentry
 import io.sentry.SentryLevel
+import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import javax.inject.Inject
 
 @AndroidEntryPoint
@@ -308,6 +312,11 @@ class NewMessageFragment : Fragment() {
             if (context.isNightModeEnabled()) editor.addCss(context.readRawResource(R.raw.custom_dark_mode))
 
             addCss(context.readRawResource(R.raw.style))
+
+            isEmptyFlow
+                .filterNotNull()
+                .onEach { isEditorEmpty -> newMessagePlaceholder.isVisible = isEditorEmpty }
+                .launchIn(lifecycleScope)
         }
 
         setupSendButton()

app/src/main/res/layout/fragment_new_message.xml

@@ -297,6 +297,17 @@
                             android:layout_width="match_parent"
                             android:layout_height="wrap_content" />
 
+                        <TextView
+                            android:id="@+id/newMessagePlaceholder"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:layout_gravity="center_vertical"
+                            android:layout_marginStart="@dimen/marginStandardMedium"
+                            android:text="@string/newMessagePlaceholderTitle"
+                            android:textColor="@color/tertiaryTextColor"
+                            android:visibility="gone"
+                            tools:visibility="visible" />
+
                     </FrameLayout>
 
                     <LinearLayout