Don't keep fetching history on non-visible timelines

If the user switched to another timeline before the current timeline
filled up with messages, nheko would keep fetching history.

Now it will check periodically if the timeline became visible so
it can decide whether or not to stop fetching history.

1 files changed, 9 insertions, 4 deletions

diff --git a/src/timeline/TimelineView.cc b/src/timeline/TimelineView.cc
index dd51fc52..dccc6f37 100644
--- a/src/timeline/TimelineView.cc
+++ b/src/timeline/TimelineView.cc
@@ -21,7 +21,6 @@
 
 #include "FloatingButton.h"
 #include "RoomMessages.h"
-#include "ScrollBar.h"
 
 #include "timeline/TimelineView.h"
 #include "timeline/widgets/AudioItem.h"
@@ -83,12 +82,18 @@ TimelineView::sliderRangeChanged(int min, int max)
 void
 TimelineView::fetchHistory()
 {
-        bool hasEnoughMessages = scroll_area_->verticalScrollBar()->isVisible();
+        if (!isScrollbarActivated() && !isTimelineFinished) {
+                if (!isVisible()) {
+                        // Check again later if the timeline became visible.
+                        // TODO: Use a backoff strategy.
+                        paginationTimer_->start(3000);
+                        return;
+                }
 
-        if (!hasEnoughMessages && !isTimelineFinished) {
                 isPaginationInProgress_ = true;
                 client_->messages(room_id_, prev_batch_token_);
-                paginationTimer_->start(500);
+                paginationTimer_->start(1500);
+
                 return;
         }