[gtk/widget-factory-theme] widget-factory: Add theme switch

[Matthias Clasen <matthiasc src gnome org>]

commit 8ab2e31b5807696e2e8385980ed29dd7cc93f514
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Mar 26 13:51:59 2020 -0400

    widget-factory: Add theme switch
    
    Add a submenu to test the builtin themes. This is mainly
    for the benefit of the artists working on those themes.

 demos/widget-factory/widget-factory.c  | 61 ++++++++++++++++++++++++++++++++--
 demos/widget-factory/widget-factory.ui | 34 ++++++++++++++++---
 2 files changed, 89 insertions(+), 6 deletions(-)
---
diff --git a/demos/widget-factory/widget-factory.c b/demos/widget-factory/widget-factory.c
index 2445af7c27..9dd12e62c9 100644
--- a/demos/widget-factory/widget-factory.c
+++ b/demos/widget-factory/widget-factory.c
@@ -26,7 +26,7 @@
 #include <gtk/gtk.h>
 
 static void
-change_theme_state (GSimpleAction *action,
+change_dark_state (GSimpleAction *action,
                     GVariant      *state,
                     gpointer       user_data)
 {
@@ -40,6 +40,57 @@ change_theme_state (GSimpleAction *action,
   g_simple_action_set_state (action, state);
 }
 
+static char *current_theme;
+static gboolean current_dark;
+
+static void
+change_theme_state (GSimpleAction *action,
+                    GVariant      *state,
+                    gpointer       user_data)
+{
+  GtkSettings *settings = gtk_settings_get_default ();
+  const char *s;
+  const char *theme;
+  gboolean prefer_dark = FALSE;
+
+  s = g_variant_get_string (state, NULL);
+
+  if (strcmp (s, "adwaita") == 0)
+    {
+      theme = "Adwaita";
+      prefer_dark = FALSE;
+    }
+  else if (strcmp (s, "adwaita-dark") == 0)
+    {
+      theme = "Adwaita";
+      prefer_dark = TRUE;
+    }
+  else if (strcmp (s, "highcontrast") == 0)
+    {
+      theme = "HighContrast";
+      prefer_dark = FALSE;
+    }
+  else if (strcmp (s, "highcontrast-inverse") == 0)
+    {
+      theme = "HighContrastInverse";
+      prefer_dark = FALSE;
+    }
+  else if (strcmp (s, "current") == 0)
+    {
+      theme = current_theme;
+      prefer_dark = current_dark;
+    }
+  else
+    return;
+
+  g_object_set (G_OBJECT (settings),
+                "gtk-theme-name", theme,
+                "gtk-application-prefer-dark-theme", prefer_dark,
+                NULL);
+
+  g_simple_action_set_state (action, state);
+}
+
 static GtkWidget *page_stack;
 
 static void
@@ -1671,7 +1722,8 @@ activate (GApplication *app)
   GtkCssProvider *provider;
   GMenuModel *model;
   static GActionEntry win_entries[] = {
-    { "dark", NULL, NULL, "false", change_theme_state },
+    { "dark", NULL, NULL, "false", change_dark_state },
+    { "theme", NULL, "s", "'current'", change_theme_state }, 
     { "transition", NULL, NULL, "false", change_transition_state },
     { "search", activate_search, NULL, NULL, NULL },
     { "delete", activate_delete, NULL, NULL, NULL },
@@ -1703,6 +1755,11 @@ activate (GApplication *app)
   GPermission *permission;
   GAction *action;
 
+  g_object_get (gtk_settings_get_default (),
+                "gtk-theme-name", &current_theme,
+                "gtk-application-prefer-dark-theme", &current_dark,
+                NULL);
+
   g_type_ensure (my_text_view_get_type ());
 
   provider = gtk_css_provider_new ();
diff --git a/demos/widget-factory/widget-factory.ui b/demos/widget-factory/widget-factory.ui
index fd6be0c188..ecca3b4ff1 100644
--- a/demos/widget-factory/widget-factory.ui
+++ b/demos/widget-factory/widget-factory.ui
@@ -6,10 +6,36 @@
         <attribute name="label" translatable="yes">Get Busy</attribute>
         <attribute name="action">win.busy</attribute>
       </item>
-      <item>
-        <attribute name="label" translatable="yes">Dark Theme</attribute>
-        <attribute name="action">win.dark</attribute>
-      </item>
+      <submenu>
+        <attribute name="label" translatable="yes">Theme</attribute>
+        <section>
+          <item>
+            <attribute name="label" translatable="yes">Current theme</attribute>
+            <attribute name="action">win.theme</attribute>
+            <attribute name="target">current</attribute>
+          </item>
+          <item>
+            <attribute name="label" translatable="yes">Adwaita</attribute>
+            <attribute name="action">win.theme</attribute>
+            <attribute name="target">adwaita</attribute>
+          </item>
+          <item>
+            <attribute name="label" translatable="yes">Adwaita dark</attribute>
+            <attribute name="action">win.theme</attribute>
+            <attribute name="target">adwaita-dark</attribute>
+          </item>
+          <item>
+            <attribute name="label" translatable="yes">High contrast</attribute>
+            <attribute name="action">win.theme</attribute>
+            <attribute name="target">highcontrast</attribute>
+          </item>
+          <item>
+            <attribute name="label" translatable="yes">High contrast inverse</attribute>
+            <attribute name="action">win.theme</attribute>
+            <attribute name="target">highcontrast-inverse</attribute>
+          </item>
+        </section>
+      </submenu> 
       <item>
         <attribute name="label" translatable="yes">Slide Pages</attribute>
         <attribute name="action">win.transition</attribute>