Auto-scroll to selected dataref. Great for keyboard operation.

lib/lb_xplane_ui/container/container.h

@@ -130,6 +130,22 @@ class WidgetsContainer : public WidgetContainer {
         return widgets.crend();
     }
 
+    widget_container_type::reference front() {
+        return widgets.front();
+    }
+
+    widget_container_type::const_reference front() const {
+        return widgets.front();
+    }
+
+    widget_container_type::reference back() {
+        return widgets.back();
+    }
+
+    widget_container_type::const_reference back() const {
+        return widgets.back();
+    }
+
     size_t widget_count() const
     {
         return widgets.size();

lib/lb_xplane_ui/container/scroll.cpp

@@ -162,3 +162,25 @@ std::shared_ptr<Widget11> ScrollContainer::mouseClick(Point point, XPLMMouseStat
 
     return nullptr;
 }
+
+void ScrollContainer::scrollIntoView(Rect rect) {
+    const Rect translated_rect = rect.translated(0, scroll_distance);
+    const Rect bounds = getBounds();
+
+    // rect is already in the viewport, no need to scroll
+    if(bounds.top >= translated_rect.top && bounds.bottom <= translated_rect.bottom) {
+        return;
+    }
+
+
+    int scroll_distance_top_aligned = bounds.top - rect.top;
+    int scroll_distance_bottom_aligned = bounds.bottom - rect.bottom;
+
+    // if desired target is taller than the scroll viewport, just set the viewport to the top of the target
+    if(rect.height() >= bounds.height()) {
+        scroll_distance = scroll_distance_top_aligned;
+    } else {
+        // center the target within the viewport
+        scroll_distance = (scroll_distance_top_aligned + scroll_distance_bottom_aligned) / 2;
+    }
+}

lib/lb_xplane_ui/container/scroll.h

@@ -64,4 +64,6 @@ class ScrollContainer : public WidgetContainer {
 
 
     virtual XPLMCursorStatus handleCursor(Point point, bool mouse_inside) override { return object_->handleCursor(point.translated(0, -scroll_distance), mouse_inside); }
+
+    void scrollIntoView(Rect rect);
 };

src/plugin/ui/search_window.cpp

@@ -176,6 +176,7 @@ SearchWindow::SearchWindow(RefRecords & refs)
                 setSelectionAvailable(nullptr);
             } else {
                 setSelectionAvailable(new_selection->getRecord());
+                list_scroll_container->scrollIntoView(new_selection->getBounds());
             }
         });
 

src/plugin/ui/selectable_list.cpp

@@ -318,6 +318,10 @@ void ResultsList::update() {
         SingleAxisLayoutContainer::addNoLayout(std::move(line_widget), false, true);
     }
 
+    if(begin() != end()) {
+        selected_element = front();
+    }
+
     recomputeLayout();
 }