Add user-callable scroll_into_view(), home() and end() member functions

Author: djowel

lib/include/elements/element/text.hpp

@@ -147,6 +147,10 @@ namespace cycfi::elements
       void                    select_end(int pos);
       void                    select_all();
       void                    select_none();
+      void                    scroll_into_view()      { _scroll_into_view = true; }
+
+      void                    home();
+      void                    end();
 
       virtual void            draw_selection(context const& ctx);
       virtual void            draw_caret(context const& ctx);
@@ -199,6 +203,7 @@ namespace cycfi::elements
       bool                    _caret_started : 1;
       bool                    _read_only : 1;
       bool                    _enabled : 1;
+      bool                    _scroll_into_view : 1;
       state_saver_set         _state_savers;
    };
 

lib/src/element/text.cpp

@@ -134,6 +134,7 @@ namespace cycfi { namespace elements
     , _caret_started{false}
     , _read_only{false}
     , _enabled{true}
+    , _scroll_into_view{false}
    {}
 
    struct basic_text_box::state_saver : std::enable_shared_from_this<basic_text_box::state_saver>
@@ -169,6 +170,12 @@ namespace cycfi { namespace elements
 
    void basic_text_box::draw(context const& ctx)
    {
+      if (_scroll_into_view)
+      {
+         scroll_into_view(ctx, false);
+         _scroll_into_view = false;
+      }
+
       draw_selection(ctx);
       if (_enabled)
       {
@@ -882,6 +889,21 @@ namespace cycfi { namespace elements
       _select_start = _select_end = -1;
    }
 
+   void basic_text_box::home()
+   {
+      select_start(0);
+      select_end(0);
+      scroll_into_view();
+   }
+
+   void basic_text_box::end()
+   {
+      auto end = get_text().size();
+      select_start(end);
+      select_end(end);
+      scroll_into_view();
+   }
+
    bool basic_text_box::word_break(int index) const
    {
       return get_layout().word_break(index) == text_layout::allow_break || line_break(index);