add touch support (#77)

* initial work on touch support

* add touch support to all objects

* add touch scrolling, fix scrollbar, fix appstore search

- when fireing an action, the action array may change. so the loop should break early as soon as an action is handled.
  this fixes the appstore search when pressing B.
- scrollbar no longer goes oob. fixes #76

currently, scrolling has no acceleration.

sphaira/include/ui/menus/themezer.hpp

@@ -2,6 +2,7 @@
 
 #include "ui/menus/menu_base.hpp"
 #include "ui/scrollable_text.hpp"
+#include "ui/list.hpp"
 #include "option.hpp"
 #include <span>
 
@@ -164,8 +165,11 @@ struct Menu final : MenuBase {
     void Draw(NVGcontext* vg, Theme* theme) override;
     void OnFocusGained() override;
 
-    void SetIndex(std::size_t index) {
+    void SetIndex(s64 index) {
         m_index = index;
+        if (!m_index) {
+            m_list->SetYoff(0);
+        }
     }
 
     // void SetSearch(const std::string& term);
@@ -180,13 +184,13 @@ private:
     static constexpr inline u32 MAX_ON_PAGE = 16; // same as website
 
     std::vector<PageEntry> m_pages;
-    std::size_t m_page_index{};
-    std::size_t m_page_index_max{1};
+    s64 m_page_index{};
+    s64 m_page_index_max{1};
 
     std::string m_search{};
 
-    std::size_t m_start{};
-    std::size_t m_index{}; // where i am in the array
+    s64 m_index{}; // where i am in the array
+    std::unique_ptr<List> m_list;
 
     // options
     option::OptionLong m_sort{INI_SECTION, "sort", 0};