[gtk+] gtk-demo: Improve markup demo

[Matthias Clasen <matthiasc src gnome org>]

commit 73fe852be00604324d6e7aeb98a9a1e557b9c8ea
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Mar 16 14:03:44 2016 -0400

    gtk-demo: Improve markup demo
    
    Add squiggly underlines and background, and make the markup editable.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763741

 demos/gtk-demo/markup.c   |   71 ++++++++++++++++++++++++++++++++++++++++++--
 demos/gtk-demo/markup.txt |    4 +-
 2 files changed, 69 insertions(+), 6 deletions(-)
---
diff --git a/demos/gtk-demo/markup.c b/demos/gtk-demo/markup.c
index 08b0689..898df8c 100644
--- a/demos/gtk-demo/markup.c
+++ b/demos/gtk-demo/markup.c
@@ -8,6 +8,34 @@
 
 #include <gtk/gtk.h>
 
+static GtkWidget *stack;
+static GtkWidget *view;
+static GtkWidget *view2;
+
+static void
+source_toggled (GtkToggleButton *button)
+{
+  if (gtk_toggle_button_get_active (button))
+    gtk_stack_set_visible_child_name (GTK_STACK (stack), "source");
+  else
+    {
+      GtkTextBuffer *buffer;
+      GtkTextIter start, end;
+      gchar *markup;
+
+      buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view2));
+      gtk_text_buffer_get_bounds (buffer, &start, &end);
+      markup = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
+
+      buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
+      gtk_text_buffer_get_start_iter (buffer, &start);
+      gtk_text_buffer_insert_markup (buffer, &start, markup, -1);
+      g_free (markup);
+
+      gtk_stack_set_visible_child_name (GTK_STACK (stack), "formatted");
+    }
+}
+
 GtkWidget *
 do_markup (GtkWidget *do_widget)
 {
@@ -15,12 +43,13 @@ do_markup (GtkWidget *do_widget)
 
   if (!window)
     {
-      GtkWidget *view;
       GtkWidget *sw;
       GtkTextBuffer *buffer;
       GtkTextIter iter;
       GBytes *bytes;
       const gchar *markup;
+      GtkWidget *header;
+      GtkWidget *show_source;
 
       window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
       gtk_window_set_screen (GTK_WINDOW (window),
@@ -29,19 +58,49 @@ do_markup (GtkWidget *do_widget)
       g_signal_connect (window, "destroy",
                         G_CALLBACK (gtk_widget_destroyed), &window);
 
+      stack = gtk_stack_new ();
+      gtk_widget_show (stack);
+      gtk_container_add (GTK_CONTAINER (window), stack);
+
+      show_source = gtk_check_button_new_with_label ("Source");
+      gtk_widget_set_valign (show_source, GTK_ALIGN_CENTER);
+      g_signal_connect (show_source, "toggled", G_CALLBACK (source_toggled), stack);
+
+      header = gtk_header_bar_new ();
+      gtk_header_bar_pack_start (GTK_HEADER_BAR (header), show_source);
+      gtk_widget_show_all (header);
+      gtk_window_set_titlebar (GTK_WINDOW (window), header);
+
       gtk_window_set_title (GTK_WINDOW (window), "Markup");
 
       view = gtk_text_view_new ();
+      gtk_text_view_set_editable (GTK_TEXT_VIEW (view), FALSE);
       gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD);
       gtk_text_view_set_left_margin (GTK_TEXT_VIEW (view), 10);
       gtk_text_view_set_right_margin (GTK_TEXT_VIEW (view), 10);
 
       sw = gtk_scrolled_window_new (NULL, NULL);
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
-                                      GTK_POLICY_NEVER,
+                                      GTK_POLICY_AUTOMATIC,
                                       GTK_POLICY_AUTOMATIC);
-      gtk_container_add (GTK_CONTAINER (window), sw);
       gtk_container_add (GTK_CONTAINER (sw), view);
+      gtk_widget_show_all (sw);
+
+      gtk_stack_add_named (GTK_STACK (stack), sw, "formatted");
+
+      view2 = gtk_text_view_new ();
+      gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view2), GTK_WRAP_WORD);
+      gtk_text_view_set_left_margin (GTK_TEXT_VIEW (view2), 10);
+      gtk_text_view_set_right_margin (GTK_TEXT_VIEW (view2), 10);
+
+      sw = gtk_scrolled_window_new (NULL, NULL);
+      gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
+                                      GTK_POLICY_AUTOMATIC,
+                                      GTK_POLICY_AUTOMATIC);
+      gtk_container_add (GTK_CONTAINER (sw), view2);
+      gtk_widget_show_all (sw);
+
+      gtk_stack_add_named (GTK_STACK (stack), sw, "source");
 
       bytes = g_resources_lookup_data ("/markup/markup.txt", 0, NULL);
       markup = (const gchar *)g_bytes_get_data (bytes, NULL);
@@ -50,9 +109,13 @@ do_markup (GtkWidget *do_widget)
       gtk_text_buffer_get_start_iter (buffer, &iter);
       gtk_text_buffer_insert_markup (buffer, &iter, markup, -1);
 
+      buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view2));
+      gtk_text_buffer_get_start_iter (buffer, &iter);
+      gtk_text_buffer_insert (buffer, &iter, markup, -1);
+
       g_bytes_unref (bytes);
 
-      gtk_widget_show_all (sw);
+      gtk_widget_show (stack);
     }
 
   if (!gtk_widget_get_visible (window))
diff --git a/demos/gtk-demo/markup.txt b/demos/gtk-demo/markup.txt
index feece2c..92da324 100644
--- a/demos/gtk-demo/markup.txt
+++ b/demos/gtk-demo/markup.txt
@@ -1,9 +1,9 @@
 
 Text sizes: <span size="xx-small">tiny</span> <span size="x-small">very small</span> <span 
size="small">small</span> <span size="medium">normal</span> <span size="large">large</span> <span 
size="x-large">very large</span> <span size="xx-large">huge</span>
 
-Text <span color="gray">c<span color="green">o</span>l<span color="tomato">o</span>rs</span>
+Text <span color="gray">c<span color="green">o</span>l<span color="tomato">o</span>rs</span> and <span 
background="pink">backgrounds</span>
 
-Colorful <span underline="low" underline-color="blue"><span underline="double" 
underline-color="red">under</span>lines</span>
+Colorful <span underline="low" underline-color="blue"><span underline="double" 
underline-color="red">under</span>lines</span> and <span background="pink"><span 
underline="error">mo</span><span underline="error" underline-color="green">re</span></span>
 
 Colorful <span strikethrough="true" strikethrough-color="magenta">strikethroughs</span>