[gtk+/wip/matthiasc/font-variations: 12/13] gtk-demo: Revise the font features demo a bit

[Matthias Clasen <matthiasc src gnome org>]

commit 5625155755b46720e6dad7f949f43620595a2725
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Dec 30 09:02:47 2017 -0500

    gtk-demo: Revise the font features demo a bit
    
    Add an edit button. Clicking on the label is not very
    obvious, and we want to make the label selectable in
    the future.

 demos/gtk-demo/font-features.ui |   30 ++++++++++++++++--------------
 demos/gtk-demo/font_features.c  |   24 +++++++++++++++++++++---
 2 files changed, 37 insertions(+), 17 deletions(-)
---
diff --git a/demos/gtk-demo/font-features.ui b/demos/gtk-demo/font-features.ui
index 0c0cfc8..6ddd98f 100644
--- a/demos/gtk-demo/font-features.ui
+++ b/demos/gtk-demo/font-features.ui
@@ -120,13 +120,13 @@
           <object class="GtkBox">
             <property name="visible">1</property>
             <property name="orientation">vertical</property>
+            <property name="hexpand">1</property>
+            <property name="vexpand">1</property>
+            <property name="margin">20</property>
+            <property name="spacing">20</property>
             <child>
               <object class="GtkStack" id="stack">
                 <property name="visible">1</property>
-                <property name="margin-start">20</property>
-                <property name="margin-end">20</property>
-                <property name="margin-top">20</property>
-                <property name="margin-bottom">20</property>
                 <child>
                   <object class="GtkLabel" id="label">
                     <property name="visible">1</property>
@@ -134,7 +134,6 @@
                     <property name="xalign">0</property>
                     <property name="yalign">0</property>
                     <property name="valign">start</property>
-                    <signal name="button-press-event" handler="switch_to_entry"/>
                   </object>
                   <packing>
                     <property name="name">label</property>
@@ -149,7 +148,7 @@
 
 Τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός</property>
                     <signal name="key-press-event" handler="entry_key_press"/>
-                    <signal name="activate" handler="switch_to_label"/>
+                    <signal name="activate" handler="stop_edit"/>
                     <property name="valign">start</property>
                     <property name="width-chars">50</property>
                   </object>
@@ -163,9 +162,6 @@
               <object class="GtkLabel" id="settings">
                 <property name="visible">1</property>
                 <property name="wrap">1</property>
-                <property name="margin-start">20</property>
-                <property name="margin-end">20</property>
-                <property name="margin-bottom">20</property>
                 <property name="xalign">0</property>
                 <property name="valign">end</property>
                 <property name="width-chars">50</property>
@@ -178,12 +174,12 @@
               </object>
             </child>
             <child>
+              <object class="GtkBox">
+                <property name="orientation">horizontal</property>
+            <child>
               <object class="GtkLabel" id="description">
                 <property name="visible">1</property>
                 <property name="wrap">1</property>
-                <property name="margin-start">20</property>
-                <property name="margin-end">20</property>
-                <property name="margin-bottom">20</property>
                 <property name="xalign">0</property>
                 <property name="valign">end</property>
                 <property name="width-chars">50</property>
@@ -194,8 +190,14 @@
                 </style>
               </object>
             </child>
-            <property name="hexpand">1</property>
-            <property name="vexpand">1</property>
+                <child>
+                  <object class="GtkToggleButton" id="edit_toggle">
+                    <property name="icon-name">document-edit-symbolic</property>
+                    <signal name="toggled" handler="toggle_edit"/>
+                  </object>
+                </child>
+              </object>
+            </child>
           </object>
         </child>
       </object>
diff --git a/demos/gtk-demo/font_features.c b/demos/gtk-demo/font_features.c
index 56450f6..9b70f60 100644
--- a/demos/gtk-demo/font_features.c
+++ b/demos/gtk-demo/font_features.c
@@ -40,6 +40,7 @@ static GtkWidget *entry;
 static GtkWidget *variations_heading;
 static GtkWidget *variations_grid;
 static GtkWidget *instance_combo;
+static GtkWidget *edit_toggle;
 
 typedef struct {
   unsigned int tag;
@@ -1512,6 +1513,7 @@ switch_to_entry (void)
 {
   text = g_strdup (gtk_entry_get_text (GTK_ENTRY (entry)));
   gtk_stack_set_visible_child_name (GTK_STACK (stack), "entry");
+  gtk_widget_grab_focus (entry);
 }
 
 static void
@@ -1523,6 +1525,21 @@ switch_to_label (void)
   update_display ();
 }
 
+static void
+toggle_edit (void)
+{
+  if (strcmp (gtk_stack_get_visible_child_name (GTK_STACK (stack)), "label") == 0)
+    switch_to_entry ();
+  else
+    switch_to_label ();
+}
+
+static void
+stop_edit (void)
+{
+  gtk_button_clicked (GTK_BUTTON (edit_toggle));
+}
+
 static gboolean
 entry_key_press (GtkEntry *entry, GdkEventKey *event)
 {
@@ -1533,7 +1550,7 @@ entry_key_press (GtkEntry *entry, GdkEventKey *event)
   if (keyval == GDK_KEY_Escape)
     {
       gtk_entry_set_text (GTK_ENTRY (entry), text);
-      switch_to_label ();
+      stop_edit ();
       return GDK_EVENT_STOP;
     }
 
@@ -1556,8 +1573,8 @@ do_font_features (GtkWidget *do_widget)
       gtk_builder_add_callback_symbol (builder, "font_changed", font_changed);
       gtk_builder_add_callback_symbol (builder, "script_changed", script_changed);
       gtk_builder_add_callback_symbol (builder, "reset", reset_features);
-      gtk_builder_add_callback_symbol (builder, "switch_to_entry", switch_to_entry);
-      gtk_builder_add_callback_symbol (builder, "switch_to_label", switch_to_label);
+      gtk_builder_add_callback_symbol (builder, "stop_edit", G_CALLBACK (stop_edit));
+      gtk_builder_add_callback_symbol (builder, "toggle_edit", G_CALLBACK (toggle_edit));
       gtk_builder_add_callback_symbol (builder, "entry_key_press", G_CALLBACK (entry_key_press));
       gtk_builder_connect_signals (builder, NULL);
 
@@ -1571,6 +1588,7 @@ do_font_features (GtkWidget *do_widget)
       script_lang = GTK_WIDGET (gtk_builder_get_object (builder, "script_lang"));
       stack = GTK_WIDGET (gtk_builder_get_object (builder, "stack"));
       entry = GTK_WIDGET (gtk_builder_get_object (builder, "entry"));
+      edit_toggle = GTK_WIDGET (gtk_builder_get_object (builder, "edit_toggle"));
 
       add_check_group (feature_list, _("Kerning"), (const char *[]){ "kern", NULL });
       add_check_group (feature_list, _("Ligatures"), (const char *[]){ "liga",