Media preview: do not propose to edit Gif

vector/src/main/java/im/vector/riotx/features/attachments/preview/AttachmentsPreviewFragment.kt

@@ -23,6 +23,7 @@ import android.content.Intent
 import android.graphics.Color
 import android.os.Bundle
 import android.os.Parcelable
+import android.view.Menu
 import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
@@ -107,6 +108,16 @@ class AttachmentsPreviewFragment @Inject constructor(
         }
     }
 
+    override fun onPrepareOptionsMenu(menu: Menu) {
+        withState(viewModel) { state ->
+            val editMenuItem = menu.findItem(R.id.attachmentsPreviewEditAction)
+            val showEditMenuItem = state.attachments[state.currentAttachmentIndex].isEditable()
+            editMenuItem.setVisible(showEditMenuItem)
+        }
+
+        super.onPrepareOptionsMenu(menu)
+    }
+
     override fun getMenuRes() = R.menu.vector_attachments_preview
 
     override fun onDestroyView() {
@@ -116,6 +127,7 @@ class AttachmentsPreviewFragment @Inject constructor(
     }
 
     override fun invalidate() = withState(viewModel) { state ->
+        requireActivity().invalidateOptionsMenu()
         if (state.attachments.isEmpty()) {
             requireActivity().setResult(RESULT_CANCELED)
             requireActivity().finish()

vector/src/main/java/im/vector/riotx/features/attachments/preview/Extensions.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.features.attachments.preview
+
+import im.vector.matrix.android.api.session.content.ContentAttachmentData
+
+/**
+ * All images are editable, expect Gif
+ */
+fun ContentAttachmentData.isEditable(): Boolean {
+    return type == ContentAttachmentData.Type.IMAGE
+            && mimeType?.startsWith("image/") == true
+            && mimeType != "image/gif"
+}