timeline: vastly improve behavior when scrolling and zooming

2023-02-28 20:39:02 -08:00
parent 9ff6e689d6
commit d0f16ef88e
5 changed files with 87 additions and 52 deletions
@@ -867,6 +867,34 @@ Block *TimelineView::GetItemAtScenePos(const rational &time, int track_index) co
  return nullptr;
 }

+QVector<Block *> TimelineView::GetItemsAtSceneRect(const QRectF &rect) const
+{
+  QVector<Block *> list;
+
+  if (connected_track_list_) {
+    rational start = this->SceneToTime(rect.left());
+    rational end = this->SceneToTime(rect.right());
+
+    for (int i = 0; i < connected_track_list_->GetTrackCount(); i++) {
+      Track *track = connected_track_list_->GetTrackAt(i);
+      int track_top = GetTrackY(i);
+      int track_bottom = track_top + GetTrackHeight(i);
+
+      if (track) {
+        if (!(track_bottom < rect.top() || track_top > rect.bottom())) {
+          Block *b = track->NearestBlockBeforeOrAt(start);
+          while (b && b->in() < end) {
+            list.append(b);
+            b = b->next();
+          }
+        }
+      }
+    }
+  }
+
+  return list;
+}
+
 void TimelineView::TrackListChanged()
 {
  UpdateSceneRect();