Add New/Back buttons to the header bar

New opens the Edit tab immediately, back goes back to the chart list

src/ag-window.c

@@ -17,6 +17,8 @@
 
 struct _AgWindowPrivate {
     GtkWidget     *header_bar;
+    GtkWidget     *menubutton_revealer;
+    GtkWidget     *new_back_stack;
     GtkWidget     *stack;
     GtkWidget     *name;
     GtkWidget     *north_lat;
@@ -860,6 +862,14 @@ ag_window_tab_changed_cb(GtkStack *stack, GParamSpec *pspec, AgWindow *window)
         gtk_widget_set_size_request(active_tab, 600, 600);
     }
 
+    if (strcmp("list", active_tab_name) == 0) {
+        gtk_revealer_set_reveal_child(GTK_REVEALER(priv->menubutton_revealer), FALSE);
+        gtk_stack_set_visible_child_name(GTK_STACK(priv->new_back_stack), "new");
+    } else {
+        gtk_revealer_set_reveal_child(GTK_REVEALER(priv->menubutton_revealer), TRUE);
+        gtk_stack_set_visible_child_name(GTK_STACK(priv->new_back_stack), "back");
+    }
+
     // If we are coming from the Edit tab, let’s assume the chart data has
     // changed. This is a bad idea, though, it should be checked instead!
     // (TODO)
@@ -886,6 +896,30 @@ ag_window_change_tab_action(GSimpleAction *action,
     g_action_change_state(G_ACTION(action), parameter);
 }
 
+static void
+ag_window_new_chart_action(GSimpleAction *action,
+                           GVariant      *parameter,
+                           gpointer      user_data)
+{
+    AgWindow        *window = AG_WINDOW(user_data);
+    AgWindowPrivate *priv   = ag_window_get_instance_private(window);
+
+    gtk_stack_set_visible_child_name(GTK_STACK(priv->stack), "edit");
+}
+
+static void
+ag_window_back_action(GSimpleAction *action,
+                      GVariant      *parameter,
+                      gpointer      user_data)
+{
+    AgWindow        *window = AG_WINDOW(user_data);
+    AgWindowPrivate *priv   = ag_window_get_instance_private(window);
+
+    /* TODO: Check for saving! */
+    ag_window_load_chart_list(window);
+    gtk_stack_set_visible_child_name(GTK_STACK(priv->stack), "list");
+}
+
 static GActionEntry win_entries[] = {
     { "close",      ag_window_close_action,      NULL, NULL,      NULL },
     { "save",       ag_window_save_action,       NULL, NULL,      NULL },
@@ -894,6 +928,8 @@ static GActionEntry win_entries[] = {
     { "view-menu",  ag_window_view_menu_action,  NULL, "false",   NULL },
     { "gear-menu",  ag_window_gear_menu_action,  NULL, "false",   NULL },
     { "change-tab", ag_window_change_tab_action, "s",  "'edit'",  NULL },
+    { "new-chart",  ag_window_new_chart_action,  NULL, NULL,      NULL },
+    { "back",       ag_window_back_action,       NULL, NULL,      NULL },
 };
 
 static void
@@ -1130,6 +1166,16 @@ ag_window_class_init(AgWindowClass *klass)
             AgWindow,
             header_bar
         );
+    gtk_widget_class_bind_template_child_private(
+            widget_class,
+            AgWindow,
+            new_back_stack
+        );
+    gtk_widget_class_bind_template_child_private(
+            widget_class,
+            AgWindow,
+            menubutton_revealer
+        );
     gtk_widget_class_bind_template_child_private(
             widget_class,
             AgWindow,

src/resources/ui/ag-window.ui

@@ -148,6 +148,44 @@
         <property name="vexpand">False</property>
         <property name="show_close_button">True</property>
         <property name="title" translatable="yes">Astrognome</property>
+        <child>
+          <object class="GtkStack" id="new_back_stack">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="homogeneous">False</property>
+            <child>
+              <object class="GtkButton" id="new_button">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="label" translatable="yes">New</property>
+                <property name="action_name">win.new-chart</property>
+              </object>
+              <packing>
+                <property name="name">new</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="back_button">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="action_name">win.back</property>
+                <style>
+                  <class name="image-button"/>
+                </style>
+                <child>
+                  <object class="GtkImage" id="back_image">
+                    <property name="visible">True</property>
+                    <property name="icon_size">1</property>
+                    <property name="icon_name">go-previous-symbolic</property>
+                  </object>
+                </child>
+              </object>
+              <packing>
+                <property name="name">back</property>
+              </packing>
+            </child>
+          </object>
+        </child>
         <child>
           <object class="GtkBox" id="box">
             <property name="visible">True</property>
@@ -158,6 +196,38 @@
             </style>
           </object>
         </child>
+        <child>
+          <object class="GtkRevealer" id="menubutton_revealer">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="reveal_child">False</property>
+            <child>
+              <object class="GtkBox" id="menubutton_box">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <child>
+                  <object class="GtkMenuButton">
+                    <property name="visible">True</property>
+                    <property name="valign">center</property>
+                    <property name="can_focus">False</property>
+                    <property name="action_name">win.view-menu</property>
+                    <property name="menu_model">view_menu</property>
+                    <property name="use_popover">False</property>
+                    <style>
+                      <class name="image-button"/>
+                    </style>
+                    <child>
+                      <object class="GtkImage" id="view_image">
+                        <property name="visible">True</property>
+                        <property name="icon_size">1</property>
+                        <property name="icon_name">document-properties-symbolic</property>
+                      </object>
+                    </child>
+                  </object>
+                  <packing>
+                    <property name="position">0</property>
+                  </packing>
+                </child>
                 <child>
                   <object class="GtkMenuButton">
                     <property name="visible">True</property>
@@ -178,25 +248,9 @@
                     </child>
                   </object>
                   <packing>
-            <property name="pack_type">end</property>
+                    <property name="position">1</property>
                   </packing>
                 </child>
-        <child>
-          <object class="GtkMenuButton">
-            <property name="visible">True</property>
-            <property name="valign">center</property>
-            <property name="can_focus">False</property>
-            <property name="action_name">win.view-menu</property>
-            <property name="menu_model">view_menu</property>
-            <property name="use_popover">False</property>
-            <style>
-              <class name="image-button"/>
-            </style>
-            <child>
-              <object class="GtkImage" id="view_image">
-                <property name="visible">True</property>
-                <property name="icon_size">1</property>
-                <property name="icon_name">document-properties-symbolic</property>
               </object>
             </child>
           </object>