[QR] add guidence how to scan QR code task

Author: zinuzoid

NEWS.txt

@@ -21,6 +21,7 @@ Version JET
 - Update SnailTrail Vario#2 color
 - NextArrowInfoBox show bearing different instead of distance
 - GRInstantInfoBox show average GR on comment label
+- Add scan QR task guidence
 
 ------------------------
 Version 7.43 - not yet released

src/Dialogs/Task/Manager/TaskActionsPanel.cpp

@@ -120,6 +120,14 @@ try {
   ShowError(std::current_exception(), _("Download"));
 }
 
+inline void
+TaskActionsPanel::OnImportQrCodeClicked() noexcept
+{
+  ShowMessageBox(_("You can use an Android camera app to scan QR then select XCSoar JET to import it here. Only .xctsk task is supported."),
+    _("Import task from QR code"),
+    MB_OK | MB_ICONINFORMATION);
+}
+
 void
 TaskActionsPanel::ReClick() noexcept
 {
@@ -149,6 +157,10 @@ TaskActionsPanel::Prepare([[maybe_unused]] ContainerWindow &_parent,
     parent.SetCurrent(parent.PAGE_WEGLIDE_PUBLIC_DECLARED);
   });
 
+  AddButton(_("Import task from QR code"), [this](){
+    OnImportQrCodeClicked();
+  });
+
   if (is_simulator())
     /* cannot communicate with real devices in simulator mode */
     SetRowEnabled(DECLARE, false);

src/Dialogs/Task/Manager/TaskActionsPanel.hpp

@@ -35,6 +35,7 @@ class TaskActionsPanel : public RowFormWidget {
   void OnNewTaskClicked();
   void OnDeclareClicked();
   void OnDownloadClicked() noexcept;
+  void OnImportQrCodeClicked() noexcept;
 
   /* virtual methods from class Widget */
   void Prepare(ContainerWindow &parent, const PixelRect &rc) noexcept override;