[gnome-builder/wip/gtk4-port] libide/gui: allow toggling .flat from property

[Christian Hergert <chergert src gnome org>]

commit 74c8649a0cf4a361e1f511c511430b54a9b0d955
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 16 12:19:24 2022 -0700

    libide/gui: allow toggling .flat from property
    
    Since we can't really control the css-name/etc from workspace subclasses
    as they don't control construction, just make this a bit easier to toggle.

 src/libide/gui/ide-header-bar.c | 49 +++++++++++++++++++++++++++++++++++++++++
 src/libide/gui/ide-header-bar.h |  5 +++++
 2 files changed, 54 insertions(+)
---
diff --git a/src/libide/gui/ide-header-bar.c b/src/libide/gui/ide-header-bar.c
index fcab48110..5c2b32b47 100644
--- a/src/libide/gui/ide-header-bar.c
+++ b/src/libide/gui/ide-header-bar.c
@@ -36,10 +36,13 @@ typedef struct
   GtkBox *left_of_center;
   GtkBox *right;
   GtkBox *right_of_center;
+
+  guint flat : 1;
 } IdeHeaderBarPrivate;
 
 enum {
   PROP_0,
+  PROP_FLAT,
   PROP_MENU_ID,
   N_PROPS
 };
@@ -75,6 +78,10 @@ ide_header_bar_get_property (GObject    *object,
 
   switch (prop_id)
     {
+    case PROP_FLAT:
+      g_value_set_boolean (value, ide_header_bar_get_flat (self));
+      break;
+
     case PROP_MENU_ID:
       g_value_set_string (value, ide_header_bar_get_menu_id (self));
       break;
@@ -94,6 +101,10 @@ ide_header_bar_set_property (GObject      *object,
 
   switch (prop_id)
     {
+    case PROP_FLAT:
+      ide_header_bar_set_flat (self, g_value_get_boolean (value));
+      break;
+
     case PROP_MENU_ID:
       ide_header_bar_set_menu_id (self, g_value_get_string (value));
       break;
@@ -113,6 +124,11 @@ ide_header_bar_class_init (IdeHeaderBarClass *klass)
   object_class->get_property = ide_header_bar_get_property;
   object_class->set_property = ide_header_bar_set_property;
 
+  properties [PROP_FLAT] =
+    g_param_spec_boolean ("flat", NULL, NULL,
+                          FALSE,
+                          (G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
+
   properties [PROP_MENU_ID] =
     g_param_spec_string ("menu-id",
                          "Menu ID",
@@ -405,3 +421,36 @@ ide_header_bar_remove (IdeHeaderBar *self,
   g_warning ("Failed to locate widget of type %s within headerbar",
              G_OBJECT_TYPE_NAME (widget));
 }
+
+gboolean
+ide_header_bar_get_flat (IdeHeaderBar *self)
+{
+  IdeHeaderBarPrivate *priv = ide_header_bar_get_instance_private (self);
+
+  g_return_val_if_fail (IDE_IS_HEADER_BAR (self), FALSE);
+
+  return priv->flat;
+}
+
+void
+ide_header_bar_set_flat (IdeHeaderBar *self,
+                         gboolean      flat)
+{
+  IdeHeaderBarPrivate *priv = ide_header_bar_get_instance_private (self);
+
+  g_return_if_fail (IDE_IS_HEADER_BAR (self));
+
+  flat = !!flat;
+
+  if (priv->flat != flat)
+    {
+      priv->flat = flat;
+
+      if (flat)
+        gtk_widget_add_css_class (GTK_WIDGET (priv->header_bar), "flat");
+      else
+        gtk_widget_remove_css_class (GTK_WIDGET (priv->header_bar), "flat");
+
+      g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_FLAT]);
+    }
+}
diff --git a/src/libide/gui/ide-header-bar.h b/src/libide/gui/ide-header-bar.h
index c459d67d4..70d66915f 100644
--- a/src/libide/gui/ide-header-bar.h
+++ b/src/libide/gui/ide-header-bar.h
@@ -63,5 +63,10 @@ const char *ide_header_bar_get_menu_id (IdeHeaderBar *self);
 IDE_AVAILABLE_IN_ALL
 void        ide_header_bar_set_menu_id (IdeHeaderBar *self,
                                         const char   *menu_id);
+IDE_AVAILABLE_IN_ALL
+gboolean    ide_header_bar_get_flat (IdeHeaderBar *self);
+IDE_AVAILABLE_IN_ALL
+void        ide_header_bar_set_flat    (IdeHeaderBar *self,
+                                        gboolean      flat);
 
 G_END_DECLS