somewhat limit scrolling extents

src/ListView.cpp

@@ -43,9 +43,16 @@ void ListView::on_mouse_button(MouseButtonEvent &event) {
         }
     } else if (event.did_scroll_down()) {
         m_scroll += m_scroll_step;
+        auto items_size = m_item_height * elements.size();
+        if (m_scroll > items_size) { 
+            m_scroll = items_size;
+        }
         repaint();
     } else if (event.did_scroll_up()) {
         m_scroll -= m_scroll_step;
+        if (m_scroll < 0) {
+            m_scroll = 0;
+        }
         repaint();
     }
 }

src/ScrollContainer.cpp

@@ -26,9 +26,9 @@ std::shared_ptr<Widget> ScrollContainer::make_target() {
 
 void ScrollContainer::on_mouse_button(MouseButtonEvent &event) {
     if (event.did_scroll_down()) {
-        set_scroll(Point(m_scroll.x(), m_scroll.y() + m_scroll_step));
+        set_scroll(Point(m_scroll.x(), std::min(m_scroll.y() + m_scroll_step, m_target->rect().height())));
     } else if (event.did_scroll_up()) {
-        set_scroll(Point(m_scroll.x(), m_scroll.y() - m_scroll_step));
+        set_scroll(Point(m_scroll.x(), std::max(0.0, m_scroll.y() - m_scroll_step)));
     }
 }
 

src/main.cpp

@@ -35,7 +35,7 @@ int main() {
     test_layout->set_margin(69);
     test_layout->set_spacing(10);
 
-    for (int i = 0; i < 1000; i++) {
+    for (int i = 0; i < 50; i++) {
         test_widget->add<Raven::Button>("Hello: " + std::to_string(i));
     }
 
@@ -104,7 +104,7 @@ int main() {
         selected_label->set_text("Selected: " + item);
     };
 
-    int i = 1000;
+    int i = 100;
     while (i --> 0) {
         list_view->elements.push_back("Item " + std::to_string(i));
     }