LVGL: Add SetNewTap to generate tap events

This function sends a tap down and tap up event to LVGL,
despite being called only once.

Author: StarGate01

src/displayapp/LittleVgl.cpp

@@ -260,11 +260,23 @@ void LittleVgl::CancelTap() {
   }
 }
 
+void LittleVgl::SetNewTap(int16_t x, int16_t y) {
+  touchPoint = {x, y};
+  tapped = true;
+  simulate_tap_release = true;
+}
+
 bool LittleVgl::GetTouchPadInfo(lv_indev_data_t* ptr) {
   ptr->point.x = touchPoint.x;
   ptr->point.y = touchPoint.y;
   if (tapped) {
     ptr->state = LV_INDEV_STATE_PR;
+    if (simulate_tap_release) {
+      // If a tap consists of only a single event, enqueue a synthetic release state update
+      tapped = false;
+      simulate_tap_release = false;
+      return true;
+    }
   } else {
     ptr->state = LV_INDEV_STATE_REL;
   }

src/displayapp/LittleVgl.h

@@ -26,6 +26,7 @@ namespace Pinetime {
       void SetFullRefresh(FullRefreshDirections direction);
       void SetNewTouchPoint(int16_t x, int16_t y, bool contact);
       void CancelTap();
+      void SetNewTap(int16_t x, int16_t y);
 
       bool GetFullRefresh() {
         bool returnValue = fullRefresh;
@@ -65,6 +66,7 @@ namespace Pinetime {
       lv_point_t touchPoint = {};
       bool tapped = false;
       bool isCancelled = false;
+      bool simulate_tap_release = false;
     };
   }
 }