MediaViewer: add Save action as a main action.

libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerView.kt

@@ -217,6 +217,9 @@ fun MediaViewerView(
                             onShareClick = {
                                 state.eventSink(MediaViewerEvent.Share(currentData))
                             },
+                            onSaveClick = {
+                                state.eventSink(MediaViewerEvent.SaveOnDisk(currentData))
+                            },
                             onInfoClick = {
                                 state.eventSink(MediaViewerEvent.OpenInfo(currentData))
                             },
@@ -461,6 +464,7 @@ private fun MediaViewerTopBar(
     canShowInfo: Boolean,
     onBackClick: () -> Unit,
     onShareClick: () -> Unit,
+    onSaveClick: () -> Unit,
     onInfoClick: () -> Unit,
     eventSink: (MediaViewerEvent) -> Unit,
 ) {
@@ -527,6 +531,15 @@ private fun MediaViewerTopBar(
                     contentDescription = stringResource(id = CommonStrings.action_share),
                 )
             }
+            IconButton(
+                onClick = onSaveClick,
+                enabled = actionsEnabled,
+            ) {
+                Icon(
+                    imageVector = CompoundIcons.Download(),
+                    contentDescription = stringResource(id = CommonStrings.action_save),
+                )
+            }
             if (canShowInfo) {
                 IconButton(
                     onClick = onInfoClick,

libraries/mediaviewer/impl/src/test/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerViewTest.kt

@@ -98,6 +98,18 @@ class MediaViewerViewTest {
         )
     }
 
+    @Test
+    fun `clicking on top action save emits expected Event`() {
+        val data = aMediaViewerPageData(
+            downloadedMedia = AsyncData.Success(aLocalMedia(uri = mockMediaUrl)),
+        )
+        testMenuAction(
+            data,
+            CommonStrings.action_save,
+            MediaViewerEvent.SaveOnDisk(data),
+        )
+    }
+
     private fun testMenuAction(
         data: MediaViewerPageData.MediaViewerData,
         contentDescriptionRes: Int,