When a full screen refresh is done, apply a vertical scroll during the refresh. This makes the transition from one screen the another one smoother, even if the refresh rate is slow.

1 files changed, 15 insertions, 1 deletions

diff --git a/src/DisplayApp/LittleVgl.h b/src/DisplayApp/LittleVgl.h
index 40fb180..555f5f0 100644
--- a/src/DisplayApp/LittleVgl.h
+++ b/src/DisplayApp/LittleVgl.h
@@ -15,10 +15,15 @@ namespace Pinetime {
     class LittleVgl {
       public:
         LittleVgl(Pinetime::Drivers::St7789& lcd, Pinetime::Drivers::Cst816S& touchPanel);
-        void FlushDisplay(const lv_area_t * area, lv_color_t * color_p);
 
+        LittleVgl(const LittleVgl&) = delete;
+        LittleVgl& operator=(const LittleVgl&) = delete;
+        LittleVgl(LittleVgl&&) = delete;
+        LittleVgl& operator=(LittleVgl&&) = delete;
 
+        void FlushDisplay(const lv_area_t * area, lv_color_t * color_p);
         bool GetTouchPadInfo(lv_indev_data_t *ptr);
+        void SetFullRefresh();
       private:
         void InitDisplay();
         void InitTouchpad();
@@ -94,6 +99,15 @@ namespace Pinetime {
         lv_style_t win_btn_pr;
 
         bool firstTouch = true;
+        bool fullRefresh = false;
+        static constexpr uint8_t nbWriteLines = 4;
+        static constexpr uint16_t totalNbLines = 320;
+        static constexpr uint16_t visibleNbLines = 240;
+        static constexpr uint8_t MaxScrollOffset() { return LV_VER_RES_MAX - nbWriteLines; }
+        enum class ScrollDirections {Unknown, Up, Down};
+        ScrollDirections scrollDirection = ScrollDirections::Up;
+        uint16_t writeOffset = 0;
+        uint16_t scrollOffset = 0;
     };
   }
 }