Clear ongoing taps when going to sleep

Author: mark9064

src/displayapp/DisplayApp.cpp

@@ -313,6 +313,10 @@ void DisplayApp::Refresh() {
           while (!lv_task_handler()) {
           };
         }
+        // Clear any ongoing touch pressed events
+        // Without this LVGL gets stuck in the pressed state and will keep refreshing the
+        // display activity timer causing the screen to never sleep after timeout
+        lvgl.ClearTouchState();
         if (msg == Messages::GoToAOD) {
           lcd.LowPowerOn();
           // Record idle entry time

src/displayapp/LittleVgl.cpp

@@ -248,13 +248,22 @@ void LittleVgl::SetNewTouchPoint(int16_t x, int16_t y, bool contact) {
   }
 }
 
+// Cancel an ongoing tap
+// Signifies that LVGL should not handle the current tap
 void LittleVgl::CancelTap() {
   if (tapped) {
     isCancelled = true;
     touchPoint = {-1, -1};
   }
 }
 
+// Clear the current tapped state
+// Signifies that touch input processing is suspended
+void LittleVgl::ClearTouchState() {
+  touchPoint = {-1, -1};
+  tapped = false;
+}
+
 bool LittleVgl::GetTouchPadInfo(lv_indev_data_t* ptr) {
   ptr->point.x = touchPoint.x;
   ptr->point.y = touchPoint.y;

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 ClearTouchState();
 
       bool GetFullRefresh() {
         bool returnValue = fullRefresh;