Change media preview swipe direction based on entry point

Fixes #7354

src/org/thoughtcrime/securesms/ConversationItem.java

@@ -611,6 +611,7 @@ public class ConversationItem extends LinearLayout
         intent.putExtra(MediaPreviewActivity.OUTGOING_EXTRA, messageRecord.isOutgoing());
         intent.putExtra(MediaPreviewActivity.DATE_EXTRA, messageRecord.getTimestamp());
         intent.putExtra(MediaPreviewActivity.SIZE_EXTRA, slide.asAttachment().getSize());
+        intent.putExtra(MediaPreviewActivity.LEFT_IS_RECENT_EXTRA, false);
 
         context.startActivity(intent);
       } else if (slide.getUri() != null) {

src/org/thoughtcrime/securesms/MediaGalleryAdapter.java

@@ -137,6 +137,7 @@ class MediaGalleryAdapter extends StickyHeaderGridAdapter {
         intent.putExtra(MediaPreviewActivity.SIZE_EXTRA, mediaRecord.getAttachment().getSize());
         intent.putExtra(MediaPreviewActivity.ADDRESS_EXTRA, address);
         intent.putExtra(MediaPreviewActivity.OUTGOING_EXTRA, mediaRecord.isOutgoing());
+        intent.putExtra(MediaPreviewActivity.LEFT_IS_RECENT_EXTRA, true);
 
         if (mediaRecord.getAddress() != null) {
           intent.putExtra(MediaPreviewActivity.ADDRESS_EXTRA, mediaRecord.getAddress());

src/org/thoughtcrime/securesms/MediaPreviewActivity.java

@@ -77,6 +77,7 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
   public static final String DATE_EXTRA           = "date";
   public static final String SIZE_EXTRA           = "size";
   public static final String OUTGOING_EXTRA       = "outgoing";
+  public static final String LEFT_IS_RECENT_EXTRA = "left_is_recent";
 
   private final DynamicLanguage dynamicLanguage = new DynamicLanguage();
 
@@ -87,6 +88,7 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
   private String    initialMediaType;
   private long      initialMediaSize;
   private Recipient conversationRecipient;
+  private boolean   leftIsRecent;
 
   private int restartItem = -1;
 
@@ -179,6 +181,7 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
     initialMediaUri  = getIntent().getData();
     initialMediaType = getIntent().getType();
     initialMediaSize = getIntent().getLongExtra(SIZE_EXTRA, 0);
+    leftIsRecent     = getIntent().getBooleanExtra(LEFT_IS_RECENT_EXTRA, false);
     restartItem      = -1;
 
     if (address != null) {
@@ -294,14 +297,14 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
 
   @Override
   public Loader<Pair<Cursor, Integer>> onCreateLoader(int id, Bundle args) {
-    return new PagingMediaLoader(this, conversationRecipient, initialMediaUri);
+    return new PagingMediaLoader(this, conversationRecipient, initialMediaUri, leftIsRecent);
   }
 
   @Override
   public void onLoadFinished(Loader<Pair<Cursor, Integer>> loader, @Nullable Pair<Cursor, Integer> data) {
     if (data != null) {
       @SuppressWarnings("ConstantConditions")
-      CursorPagerAdapter adapter = new CursorPagerAdapter(this, masterSecret, GlideApp.with(this), getWindow(), data.first, data.second);
+      CursorPagerAdapter adapter = new CursorPagerAdapter(this, masterSecret, GlideApp.with(this), getWindow(), data.first, data.second, leftIsRecent);
       mediaPager.setAdapter(adapter);
       adapter.setActive(true);
 
@@ -423,13 +426,14 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
     private final GlideRequests glideRequests;
     private final Window        window;
     private final Cursor        cursor;
+    private final boolean       leftIsRecent;
 
     private boolean active;
     private int     autoPlayPosition;
 
     CursorPagerAdapter(@NonNull Context context, @NonNull MasterSecret masterSecret,
                        @NonNull GlideRequests glideRequests, @NonNull Window window,
-                       @NonNull Cursor cursor, int autoPlayPosition)
+                       @NonNull Cursor cursor, int autoPlayPosition, boolean leftIsRecent)
     {
       this.context          = context.getApplicationContext();
       this.masterSecret     = masterSecret;
@@ -437,6 +441,7 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
       this.window           = window;
       this.cursor           = cursor;
       this.autoPlayPosition = autoPlayPosition;
+      this.leftIsRecent     = leftIsRecent;
     }
 
     public void setActive(boolean active) {
@@ -460,10 +465,11 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
       View      itemView       = LayoutInflater.from(context).inflate(R.layout.media_view_page, container, false);
       MediaView mediaView      = itemView.findViewById(R.id.media_view);
       boolean   autoplay       = position == autoPlayPosition;
+      int       cursorPosition = getCursorPosition(position);
 
       autoPlayPosition = -1;
 
-      cursor.moveToPosition(position);
+      cursor.moveToPosition(cursorPosition);
 
       MediaRecord mediaRecord = MediaRecord.from(context, masterSecret, cursor);
 
@@ -490,7 +496,7 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
     }
 
     public MediaItem getMediaItemFor(int position) {
-      cursor.moveToPosition(position);
+      cursor.moveToPosition(getCursorPosition(position));
       MediaRecord mediaRecord = MediaRecord.from(context, masterSecret, cursor);
       Address     address     = mediaRecord.getAddress();
 
@@ -508,6 +514,11 @@ public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity im
       MediaView mediaView = mediaViews.get(position);
       if (mediaView != null) mediaView.pause();
     }
+
+    private int getCursorPosition(int position) {
+      if (leftIsRecent) return position;
+      else              return cursor.getCount() - 1 - position;
+    }
   }
 
   private static class MediaItem {

src/org/thoughtcrime/securesms/RecipientPreferenceActivity.java

@@ -161,6 +161,7 @@ public class RecipientPreferenceActivity extends PassphraseRequiredActionBarActi
       intent.putExtra(MediaPreviewActivity.OUTGOING_EXTRA, mediaRecord.isOutgoing());
       intent.putExtra(MediaPreviewActivity.DATE_EXTRA, mediaRecord.getDate());
       intent.putExtra(MediaPreviewActivity.SIZE_EXTRA, mediaRecord.getAttachment().getSize());
+      intent.putExtra(MediaPreviewActivity.LEFT_IS_RECENT_EXTRA, true);
       intent.setDataAndType(mediaRecord.getAttachment().getDataUri(), mediaRecord.getContentType());
       startActivity(intent);
     });

src/org/thoughtcrime/securesms/database/loaders/PagingMediaLoader.java

@@ -22,11 +22,13 @@ public class PagingMediaLoader extends AsyncLoader<Pair<Cursor, Integer>> {
 
   private final Recipient recipient;
   private final Uri       uri;
+  private final boolean   leftIsRecent;
 
-  public PagingMediaLoader(@NonNull Context context, @NonNull Recipient recipient, @NonNull Uri uri) {
+  public PagingMediaLoader(@NonNull Context context, @NonNull Recipient recipient, @NonNull Uri uri, boolean leftIsRecent) {
     super(context);
     this.recipient    = recipient;
     this.uri          = uri;
+    this.leftIsRecent = leftIsRecent;
   }
 
   @Nullable
@@ -40,7 +42,7 @@ public class PagingMediaLoader extends AsyncLoader<Pair<Cursor, Integer>> {
       Uri          attachmentUri = PartAuthority.getAttachmentDataUri(attachmentId);
 
       if (attachmentUri.equals(uri)) {
-        return new Pair<>(cursor, cursor.getPosition());
+        return new Pair<>(cursor, leftIsRecent ? cursor.getPosition() : cursor.getCount() - 1 - cursor.getPosition());
       }
     }