[gnome-builder/wip/gtk4-port] libide/gui: add vfunc to get headerbar

[Christian Hergert <chergert src gnome org>]

commit 6d8882fbeaab86f2dae44f32fa515170b1092939
Author: Christian Hergert <chergert redhat com>
Date:   Sun May 8 12:43:02 2022 -0700

    libide/gui: add vfunc to get headerbar
    
    We cant use the fallback GtkWindow API for this as it doesn't work with
    libadwaita where all of the window content is within a box.

 src/libide/editor/ide-editor-workspace.c |  7 ++++
 src/libide/gui/ide-primary-workspace.c   |  7 ++++
 src/libide/gui/ide-workspace.c           | 16 ++++----
 src/libide/gui/ide-workspace.h           | 67 ++++++++++++++++----------------
 4 files changed, 56 insertions(+), 41 deletions(-)
---
diff --git a/src/libide/editor/ide-editor-workspace.c b/src/libide/editor/ide-editor-workspace.c
index 2cd9f14ad..d12edb5a8 100644
--- a/src/libide/editor/ide-editor-workspace.c
+++ b/src/libide/editor/ide-editor-workspace.c
@@ -172,6 +172,12 @@ ide_editor_workspace_can_search (IdeWorkspace *workspace)
   return TRUE;
 }
 
+static IdeHeaderBar *
+ide_editor_workspace_get_header_bar (IdeWorkspace *workspace)
+{
+  return IDE_EDITOR_WORKSPACE (workspace)->header_bar;
+}
+
 static void
 ide_editor_workspace_dispose (GObject *object)
 {
@@ -202,6 +208,7 @@ ide_editor_workspace_class_init (IdeEditorWorkspaceClass *klass)
   workspace_class->context_set = ide_editor_workspace_context_set;
   workspace_class->get_frame_at_position = ide_editor_workspace_get_frame_at_position;
   workspace_class->get_most_recent_frame = ide_editor_workspace_get_most_recent_frame;
+  workspace_class->get_header_bar = ide_editor_workspace_get_header_bar;
 
   ide_workspace_class_set_kind (workspace_class, "editor");
 
diff --git a/src/libide/gui/ide-primary-workspace.c b/src/libide/gui/ide-primary-workspace.c
index 56aeb7574..48fc5e071 100644
--- a/src/libide/gui/ide-primary-workspace.c
+++ b/src/libide/gui/ide-primary-workspace.c
@@ -179,6 +179,12 @@ ide_primary_workspace_can_search (IdeWorkspace *workspace)
   return TRUE;
 }
 
+static IdeHeaderBar *
+ide_primary_workspace_get_header_bar (IdeWorkspace *workspace)
+{
+  return IDE_PRIMARY_WORKSPACE (workspace)->header_bar;
+}
+
 static void
 ide_primary_workspace_dispose (GObject *object)
 {
@@ -211,6 +217,7 @@ ide_primary_workspace_class_init (IdePrimaryWorkspaceClass *klass)
   workspace_class->context_set = ide_primary_workspace_context_set;
   workspace_class->get_frame_at_position = ide_primary_workspace_get_frame_at_position;
   workspace_class->get_most_recent_frame = ide_primary_workspace_get_most_recent_frame;
+  workspace_class->get_header_bar = ide_primary_workspace_get_header_bar;
 
   ide_workspace_class_set_kind (workspace_class, "primary");
 
diff --git a/src/libide/gui/ide-workspace.c b/src/libide/gui/ide-workspace.c
index 02bbdca83..955ec7944 100644
--- a/src/libide/gui/ide-workspace.c
+++ b/src/libide/gui/ide-workspace.c
@@ -452,6 +452,12 @@ ide_workspace_real_can_search (IdeWorkspace *self)
   return FALSE;
 }
 
+static IdeHeaderBar *
+ide_workspace_real_get_header_bar (IdeWorkspace *workspace)
+{
+  return NULL;
+}
+
 static void
 ide_workspace_dispose (GObject *object)
 {
@@ -541,6 +547,7 @@ ide_workspace_class_init (IdeWorkspaceClass *klass)
   klass->get_most_recent_frame = ide_workspace_real_get_most_recent_frame;
   klass->restore_size = ide_workspace_restore_size;
   klass->save_size = ide_workspace_save_size;
+  klass->get_header_bar = ide_workspace_real_get_header_bar;
 
   /**
    * IdeWorkspace:context:
@@ -701,16 +708,9 @@ ide_workspace_foreach_page (IdeWorkspace    *self,
 IdeHeaderBar *
 ide_workspace_get_header_bar (IdeWorkspace *self)
 {
-  GtkWidget *ret = NULL;
-
   g_return_val_if_fail (IDE_IS_WORKSPACE (self), NULL);
 
-  ret = gtk_window_get_titlebar (GTK_WINDOW (self));
-
-  if (IDE_IS_HEADER_BAR (ret))
-    return IDE_HEADER_BAR (ret);
-
-  return NULL;
+  return IDE_WORKSPACE_GET_CLASS (self)->get_header_bar (self);
 }
 
 /**
diff --git a/src/libide/gui/ide-workspace.h b/src/libide/gui/ide-workspace.h
index d0e29fda6..07631e72f 100644
--- a/src/libide/gui/ide-workspace.h
+++ b/src/libide/gui/ide-workspace.h
@@ -54,39 +54,40 @@ struct _IdeWorkspaceClass
   guint has_statusbar : 1;
   guint _unused_flags : 31;
 
-  void        (*context_set)           (IdeWorkspace         *self,
-                                        IdeContext           *context);
-  void        (*foreach_page)          (IdeWorkspace         *self,
-                                        IdePageCallback       callback,
-                                        gpointer              user_data);
-  IdePage    *(*get_most_recent_page)  (IdeWorkspace         *self);
-  IdeFrame   *(*get_most_recent_frame) (IdeWorkspace         *self);
-  void        (*agree_to_close_async)  (IdeWorkspace         *self,
-                                        GCancellable         *cancellable,
-                                        GAsyncReadyCallback   callback,
-                                        gpointer              user_data);
-  gboolean    (*agree_to_close_finish) (IdeWorkspace         *self,
-                                        GAsyncResult         *result,
-                                        GError              **error);
-  void        (*add_pane)              (IdeWorkspace         *self,
-                                        IdePane              *pane,
-                                        IdePanelPosition     *position);
-  void        (*add_page)              (IdeWorkspace         *self,
-                                        IdePage              *page,
-                                        IdePanelPosition     *position);
-  void        (*add_overlay)           (IdeWorkspace         *self,
-                                        GtkWidget            *overlay);
-  void        (*remove_overlay)        (IdeWorkspace         *self,
-                                        GtkWidget            *overlay);
-  PanelFrame *(*get_frame_at_position) (IdeWorkspace         *self,
-                                        IdePanelPosition     *position);
-  void        (*restore_size)          (IdeWorkspace         *self,
-                                        int                   width,
-                                        int                   height);
-  gboolean    (*save_size)             (IdeWorkspace         *self,
-                                        int                  *width,
-                                        int                  *height);
-  gboolean    (*can_search)            (IdeWorkspace         *self);
+  void          (*context_set)           (IdeWorkspace         *self,
+                                          IdeContext           *context);
+  void          (*foreach_page)          (IdeWorkspace         *self,
+                                          IdePageCallback       callback,
+                                          gpointer              user_data);
+  IdeHeaderBar *(*get_header_bar)        (IdeWorkspace         *self);
+  IdePage      *(*get_most_recent_page)  (IdeWorkspace         *self);
+  IdeFrame     *(*get_most_recent_frame) (IdeWorkspace         *self);
+  void          (*agree_to_close_async)  (IdeWorkspace         *self,
+                                          GCancellable         *cancellable,
+                                          GAsyncReadyCallback   callback,
+                                          gpointer              user_data);
+  gboolean      (*agree_to_close_finish) (IdeWorkspace         *self,
+                                          GAsyncResult         *result,
+                                          GError              **error);
+  void          (*add_pane)              (IdeWorkspace         *self,
+                                          IdePane              *pane,
+                                          IdePanelPosition     *position);
+  void          (*add_page)              (IdeWorkspace         *self,
+                                          IdePage              *page,
+                                          IdePanelPosition     *position);
+  void          (*add_overlay)           (IdeWorkspace         *self,
+                                          GtkWidget            *overlay);
+  void          (*remove_overlay)        (IdeWorkspace         *self,
+                                          GtkWidget            *overlay);
+  PanelFrame   *(*get_frame_at_position) (IdeWorkspace         *self,
+                                          IdePanelPosition     *position);
+  void          (*restore_size)          (IdeWorkspace         *self,
+                                          int                   width,
+                                          int                   height);
+  gboolean      (*save_size)             (IdeWorkspace         *self,
+                                          int                  *width,
+                                          int                  *height);
+  gboolean      (*can_search)            (IdeWorkspace         *self);
 };
 
 IDE_AVAILABLE_IN_ALL