1 files changed, 143 insertions, 0 deletions
diff --git a/src/main/java/eu/siacs/conversations/ui/listeners/ConversationMoreMessagesLoadedListener.java b/src/main/java/eu/siacs/conversations/ui/listeners/ConversationMoreMessagesLoadedListener.java
new file mode 100644
index 00000000..08916206
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/ui/listeners/ConversationMoreMessagesLoadedListener.java
@@ -0,0 +1,143 @@
+package eu.siacs.conversations.ui.listeners;
+
+import android.view.View;
+import android.widget.ListView;
+import android.widget.Toast;
+
+import com.orangegangsters.github.swipyrefreshlayout.library.SwipyRefreshLayout;
+
+import java.util.List;
+
+import eu.siacs.conversations.entities.Conversation;
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.services.XmppConnectionService;
+import eu.siacs.conversations.ui.ConversationActivity;
+import eu.siacs.conversations.ui.ConversationFragment;
+import eu.siacs.conversations.ui.adapter.MessageAdapter;
+
+/**
+ * This listener updates the UI when messages are loaded from the server.
+ */
+public class ConversationMoreMessagesLoadedListener implements XmppConnectionService.OnMoreMessagesLoaded {
+    private SwipyRefreshLayout swipeLayout;
+    private List<Message> messageList;
+    private ConversationFragment fragment;
+    private ListView messagesView;
+    private MessageAdapter messageListAdapter;
+    private Toast messageLoaderToast;
+    /*
+    The current loading status
+     */
+    private boolean loadingMessages = false;
+    /**
+     * Whether the user is loading only history messages or not.
+     * History messages are messages which are older than the oldest in the database.
+     */
+    private boolean loadHistory = true;
+
+    public ConversationMoreMessagesLoadedListener(SwipyRefreshLayout swipeLayout, List<Message> messageList, ConversationFragment fragment, ListView messagesView, MessageAdapter messageListAdapter) {
+        this.swipeLayout = swipeLayout;
+        this.messageList = messageList;
+        this.fragment = fragment;
+        this.messagesView = messagesView;
+        this.messageListAdapter = messageListAdapter;
+    }
+
+    public void setLoadHistory(boolean value) {
+        this.loadHistory = value;
+    }
+
+    public void setLoadingInProgress() {
+        this.loadingMessages = true;
+    }
+
+    public boolean isLoadingInProgress() {
+        return this.loadingMessages;
+    }
+
+    @Override
+    public void onMoreMessagesLoaded(final int c, final Conversation conversation) {
+        ConversationActivity activity = (ConversationActivity) fragment.getActivity();
+        // Current selected conversation is not the same the messages are loaded - skip updating message view and hide loading graphic
+        if (activity.getSelectedConversation() != conversation) {
+            activity.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    swipeLayout.setRefreshing(false);
+                }
+            });
+            return;
+        }
+        // No new messages are loaded
+        if (0 == c) {
+            if (this.loadHistory) {
+                conversation.setHasMessagesLeftOnServer(false);
+            }
+            activity.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    swipeLayout.setRefreshing(false);
+                }
+            });
+        }
+        activity.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                final int oldPosition = messagesView.getFirstVisiblePosition(); // Always 0 - because loading starts always when hitting the top
+                String uuid = null;
+                boolean oldMessageListWasEmpty = messageList.isEmpty();
+                if (-1 < oldPosition && messageList.size() > oldPosition) {
+                    Message message = messageList.get(oldPosition);
+                    uuid = message != null ? message.getUuid() : null;
+                }
+                View v = messagesView.getChildAt(0);
+                final int pxOffset = (v == null) ? 0 : v.getTop();
+
+                conversation.populateWithMessages(messageList); // This overrides the old message list
+                fragment.updateStatusMessages(); // This adds "messages" to the list for the status
+                messageListAdapter.notifyDataSetChanged();
+                loadingMessages = false; // Loading of messages is finished - next query can be loaded
+
+                int pos = getIndexOf(uuid, messageList);
+
+                if (!oldMessageListWasEmpty) {
+                    messagesView.setSelectionFromTop(pos, pxOffset);
+                }
+
+                if (messageLoaderToast != null) {
+                    messageLoaderToast.cancel();
+                }
+                swipeLayout.setRefreshing(false);
+            }
+        });
+    }
+
+    @Override
+    public void informUser(final int resId) {
+        final ConversationActivity activity = (ConversationActivity) fragment.getActivity();
+
+        activity.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                if (messageLoaderToast != null) {
+                    messageLoaderToast.cancel();
+                }
+                messageLoaderToast = Toast.makeText(activity, resId, Toast.LENGTH_LONG);
+                messageLoaderToast.show();
+            }
+        });
+
+    }
+
+    private int getIndexOf(String uuid, List<Message> messages) {
+        if (uuid == null) {
+            return 0;
+        }
+        for (int i = 0; i < messages.size(); ++i) {
+            if (uuid.equals(messages.get(i).getUuid())) {
+                return i;
+            }
+        }
+        return 0;
+    }
+}