navigation with app state (#468)

src/z2ui5_cl_demo_app_320.clas.abap

@@ -3,7 +3,6 @@ CLASS z2ui5_cl_demo_app_320 DEFINITION
   CREATE PUBLIC.
 
   PUBLIC SECTION.
-    INTERFACES if_serializable_object.
     INTERFACES z2ui5_if_app.
 
     DATA check_initialized    TYPE abap_bool.

src/z2ui5_cl_demo_app_321.clas.abap

@@ -0,0 +1,79 @@
+CLASS z2ui5_cl_demo_app_321 DEFINITION
+  PUBLIC FINAL
+  CREATE PUBLIC.
+
+  PUBLIC SECTION.
+    INTERFACES z2ui5_if_app.
+
+    DATA mv_product TYPE string.
+    DATA mv_quantity TYPE string.
+    DATA mv_search TYPE string.
+
+    DATA mt_search TYPE z2ui5_cl_util=>ty_t_name_value.
+  PROTECTED SECTION.
+
+
+    DATA client TYPE REF TO z2ui5_if_client.
+    METHODS state_handling
+      RETURNING
+        VALUE(result) TYPE abap_bool.
+
+ENDCLASS.
+
+
+CLASS z2ui5_cl_demo_app_321 IMPLEMENTATION.
+
+  METHOD z2ui5_if_app~main.
+    me->client = client.
+    IF state_handling( ).
+      RETURN.
+    ENDIF.
+
+    IF client->check_on_navigated( ).
+      DATA(view) = z2ui5_cl_xml_view=>factory( ).
+      view->_z2ui5( )->history( client->_bind( mv_search ) ).
+      client->view_display( val = view->shell(
+             )->page(
+                     title          = 'abap2UI5 - Navigation with app state'
+                     navbuttonpress = client->_event( 'BACK' )
+                     shownavbutton  = client->check_app_prev_stack( )
+          )->simple_form( title = 'Form Title' editable = abap_true
+                     )->content( 'form'
+                         )->title( 'Input'
+                         )->label( 'quantity'
+                         )->input( client->_bind_edit( mv_quantity )
+                         )->label( `product`
+                         )->input( client->_bind_edit( mv_product )
+                         )->button(
+                             text  = 'post'
+                             press = client->_event( val = 'BUTTON_POST' )
+              )->stringify( ) ).
+    ENDIF.
+
+    client->message_toast_display( `data updated` ).
+  ENDMETHOD.
+
+
+  METHOD state_handling.
+
+    IF client->check_on_init( ).
+      "we check if an app state is already set, if yes leave to this state (draft)
+      TRY.
+          mt_search = z2ui5_cl_util=>url_param_get_tab( client->get( )-s_config-search ).
+          DATA(lv_id) = mt_search[ n =  `z2ui5-xapp-state` ]-v.
+          client->nav_app_leave( client->get_app( lv_id ) ).
+          result = abap_true.
+          RETURN.
+        CATCH cx_root.
+      ENDTRY.
+    ENDIF.
+
+    "set the url parameter with the actual app state id (draft)
+    DELETE mt_search WHERE n = `z2ui5-xapp-state`.
+    INSERT VALUE #( n = `z2ui5-xapp-state` v = client->get( )-s_draft-id ) INTO TABLE mt_search.
+    mv_search = `?` && z2ui5_cl_util=>url_param_create_url( mt_search ).
+    client->view_model_update( ).
+
+  ENDMETHOD.
+
+ENDCLASS.

src/z2ui5_cl_demo_app_321.clas.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<abapGit version="v1.0.0" serializer="LCL_OBJECT_CLAS" serializer_version="v1.0.0">
+ <asx:abap xmlns:asx="http://www.sap.com/abapxml" version="1.0">
+  <asx:values>
+   <VSEOCLASS>
+    <CLSNAME>Z2UI5_CL_DEMO_APP_321</CLSNAME>
+    <LANGU>E</LANGU>
+    <DESCRIPT>Navigation - app state</DESCRIPT>
+    <STATE>1</STATE>
+    <CLSCCINCL>X</CLSCCINCL>
+    <FIXPT>X</FIXPT>
+    <UNICODE>X</UNICODE>
+   </VSEOCLASS>
+  </asx:values>
+ </asx:abap>
+</abapGit>