[gimp] app: show GimpItemTreeView's header.

[Jehan <jehanp src gnome org>]

commit 59f3d0097c5e1540056a085b72d6019a61dab30a
Author: Jehan <jehan girinstud io>
Date:   Thu Feb 25 18:40:42 2021 +0100

    app: show GimpItemTreeView's header.
    
    The header shows a lock icon, making the column more discoverable, as
    well as where to click.
    Also the title for the item column will now be used for the
    multi-selection label (counting items) instead of using
    GimpItemTreeView's options box.
    
    Finally use the new gimp-multi-lock icon to show multiple locks.
    
    This makes for much nicer and usable item tree.

 app/widgets/gimpcontainertreeview-private.h |  2 +
 app/widgets/gimpcontainertreeview.c         | 47 +++++++++++++++++
 app/widgets/gimpdrawabletreeview.c          |  2 +-
 app/widgets/gimpitemtreeview.c              | 82 ++++++-----------------------
 4 files changed, 67 insertions(+), 66 deletions(-)
---
diff --git a/app/widgets/gimpcontainertreeview-private.h b/app/widgets/gimpcontainertreeview-private.h
index 364ca893d7..d3b7f158a8 100644
--- a/app/widgets/gimpcontainertreeview-private.h
+++ b/app/widgets/gimpcontainertreeview-private.h
@@ -28,6 +28,8 @@ struct _GimpContainerTreeViewPrivate
 
   GtkCellRenderer    *name_cell;
 
+  GtkWidget          *multi_selection_label;
+
   GList              *editable_cells;
   gchar              *editing_path;
 
diff --git a/app/widgets/gimpcontainertreeview.c b/app/widgets/gimpcontainertreeview.c
index dd8c57d282..c346ba5699 100644
--- a/app/widgets/gimpcontainertreeview.c
+++ b/app/widgets/gimpcontainertreeview.c
@@ -46,6 +46,8 @@
 #include "gimpviewrenderer.h"
 #include "gimpwidgets-utils.h"
 
+#include "gimp-intl.h"
+
 
 enum
 {
@@ -98,6 +100,10 @@ static void          gimp_container_tree_view_set_view_size     (GimpContainerVi
 
 static void          gimp_container_tree_view_real_edit_name    (GimpContainerTreeView       *tree_view);
 
+static void     gimp_container_tree_view_selection_label_notify (GtkLabel                    *label,
+                                                                 GParamSpec                  *pspec,
+                                                                 GimpItemTreeView            *view);
+
 static gboolean      gimp_container_tree_view_edit_focus_out    (GtkWidget                   *widget,
                                                                  GdkEvent                    *event,
                                                                  gpointer                     user_data);
@@ -274,6 +280,17 @@ gimp_container_tree_view_constructed (GObject *object)
   gimp_container_view_set_dnd_widget (view, GTK_WIDGET (tree_view->view));
 
   tree_view->main_column = gtk_tree_view_column_new ();
+  tree_view->priv->multi_selection_label = gtk_label_new (NULL);
+  gtk_label_set_selectable (GTK_LABEL (tree_view->priv->multi_selection_label), TRUE);
+  gtk_tree_view_column_set_widget (tree_view->main_column,
+                                   tree_view->priv->multi_selection_label);
+  g_signal_connect (tree_view->priv->multi_selection_label, "notify::label",
+                    G_CALLBACK (gimp_container_tree_view_selection_label_notify),
+                    tree_view);
+  g_signal_connect (tree_view->priv->multi_selection_label, "notify::selection-bound",
+                    G_CALLBACK (gimp_container_tree_view_selection_label_notify),
+                    tree_view);
+  gtk_widget_show (tree_view->priv->multi_selection_label);
   gtk_tree_view_insert_column (tree_view->view, tree_view->main_column, 0);
 
   gtk_tree_view_set_expander_column (tree_view->view, tree_view->main_column);
@@ -977,6 +994,22 @@ gimp_container_tree_view_select_items (GimpContainerView *view,
   if (free_paths)
     g_list_free_full (paths, (GDestroyNotify) gtk_tree_path_free);
 
+  if (g_list_length (items) > 1)
+    {
+      gchar *str;
+
+      str = g_strdup_printf (ngettext ("%d item selected", "%d items selected",
+                                       g_list_length (items)),
+                             g_list_length (items));
+      gtk_label_set_text (GTK_LABEL (tree_view->priv->multi_selection_label), str);
+      g_free (str);
+      gtk_widget_show (tree_view->priv->multi_selection_label);
+    }
+  else
+    {
+      gtk_widget_hide (tree_view->priv->multi_selection_label);
+    }
+
   return TRUE;
 }
 
@@ -1101,6 +1134,20 @@ gimp_container_tree_view_real_edit_name (GimpContainerTreeView *tree_view)
 
 /*  callbacks  */
 
+static void
+gimp_container_tree_view_selection_label_notify (GtkLabel         *label,
+                                                 GParamSpec       *pspec,
+                                                 GimpItemTreeView *view)
+{
+  /* This is a weird trick to make the label follow the color scheme of
+   * selected items in whatever theme is selected. It seems we cannot
+   * link to the color of another widget whose theme we don't control.
+   * Faking selection is the only way I found, though it is quite ugly
+   * semantically.
+   */
+  gtk_label_select_region (label, 0, -1);
+}
+
 static gboolean
 gimp_container_tree_view_edit_focus_out (GtkWidget *widget,
                                          GdkEvent  *event,
diff --git a/app/widgets/gimpdrawabletreeview.c b/app/widgets/gimpdrawabletreeview.c
index 6e6d10b45d..ad3ae0b7d9 100644
--- a/app/widgets/gimpdrawabletreeview.c
+++ b/app/widgets/gimpdrawabletreeview.c
@@ -122,7 +122,7 @@ gimp_drawable_tree_view_class_init (GimpDrawableTreeViewClass *klass)
   item_view_class->lock_content_tooltip      = _("Lock pixels");
   item_view_class->lock_position_icon_name   = GIMP_ICON_TOOL_MOVE;
   item_view_class->lock_position_tooltip     = _("Lock position and size");
-  item_view_class->lock_visibility_icon_name = GIMP_ICON_LAYER;
+  item_view_class->lock_visibility_icon_name = GIMP_ICON_VISIBLE;
   item_view_class->lock_visibility_tooltip   = _("Lock visibility");
 }
 
diff --git a/app/widgets/gimpitemtreeview.c b/app/widgets/gimpitemtreeview.c
index 2e7fd5dd79..1d941afbbe 100644
--- a/app/widgets/gimpitemtreeview.c
+++ b/app/widgets/gimpitemtreeview.c
@@ -71,7 +71,6 @@ struct _GimpItemTreeViewPrivate
 
   GtkWidget       *options_box;
   GtkSizeGroup    *options_group;
-  GtkWidget       *multi_selection_label;
 
   GimpItem        *lock_box_item;
   GtkTreePath     *lock_box_path;
@@ -227,10 +226,6 @@ static gboolean gimp_item_tree_view_item_pre_clicked(GimpCellRendererViewable *c
                                                      GdkModifierType           state,
                                                      GimpItemTreeView         *item_view);
 
-static void   gimp_item_tree_view_selection_label_notify (GtkLabel         *label,
-                                                          GParamSpec       *pspec,
-                                                          GimpItemTreeView *view);
-
 static void   gimp_item_tree_view_row_expanded      (GtkTreeView       *tree_view,
                                                      GtkTreeIter       *iter,
                                                      GtkTreePath       *path,
@@ -384,10 +379,19 @@ gimp_item_tree_view_constructed (GObject *object)
   GimpContainerTreeView *tree_view       = GIMP_CONTAINER_TREE_VIEW (object);
   GimpItemTreeView      *item_view       = GIMP_ITEM_TREE_VIEW (object);
   GtkTreeViewColumn     *column;
+  GtkWidget             *lock_image;
+  GtkIconSize            button_icon_size;
   gint                   button_spacing;
 
   G_OBJECT_CLASS (parent_class)->constructed (object);
 
+  gtk_tree_view_set_headers_visible (tree_view->view, TRUE);
+
+  gtk_widget_style_get (GTK_WIDGET (item_view),
+                        "button-icon-size", &button_icon_size,
+                        "button-spacing", &button_spacing,
+                        NULL);
+
   gimp_container_tree_view_connect_name_edited (tree_view,
                                                 G_CALLBACK (gimp_item_tree_view_name_edited),
                                                 item_view);
@@ -427,9 +431,12 @@ gimp_item_tree_view_constructed (GObject *object)
                     item_view);
 
   column = gtk_tree_view_column_new ();
+  lock_image = gtk_image_new_from_icon_name ("system-lock-screen", button_icon_size);
+  gtk_tree_view_column_set_widget (column, lock_image);
+  gtk_widget_show (lock_image);
   gtk_tree_view_insert_column (tree_view->view, column, 1);
 
-  item_view->priv->lock_cell = gimp_cell_renderer_toggle_new ("system-lock-screen");
+  item_view->priv->lock_cell = gimp_cell_renderer_toggle_new (GIMP_ICON_MULTI_LOCK);
   g_object_set (item_view->priv->lock_cell,
                 "xpad", 0,
                 "ypad", 0,
@@ -504,20 +511,7 @@ gimp_item_tree_view_constructed (GObject *object)
                                   GTK_BUTTON (item_view->priv->delete_button),
                                   item_view_class->item_type);
 
-  /* Multi-selection label */
-  item_view->priv->multi_selection_label = gtk_label_new (NULL);
-  gtk_widget_set_name (item_view->priv->multi_selection_label, "treeview");
-  gtk_label_set_selectable (GTK_LABEL (item_view->priv->multi_selection_label), TRUE);
-  gimp_item_tree_view_add_options (item_view, "", item_view->priv->multi_selection_label);
-  gtk_box_set_child_packing (GTK_BOX (item_view->priv->options_box),
-                             gtk_widget_get_parent (item_view->priv->multi_selection_label),
-                             FALSE, FALSE, 0, GTK_PACK_END);
-
   /* Lock box. */
-  gtk_widget_style_get (GTK_WIDGET (item_view),
-                        "button-spacing", &button_spacing,
-                        NULL);
-
   item_view->priv->lock_box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, button_spacing);
 
   /*  Lock box: content toggle  */
@@ -687,7 +681,7 @@ gimp_item_tree_view_style_updated (GtkWidget *widget)
                 "icon-name", GIMP_ICON_VISIBLE,
                 NULL);
   g_object_set (view->priv->lock_cell,
-                "icon-name", "system-lock-screen",
+                "icon-name", GIMP_ICON_MULTI_LOCK,
                 NULL);
 
   GTK_WIDGET_CLASS (parent_class)->style_updated (widget);
@@ -1137,7 +1131,7 @@ gimp_item_tree_view_insert_item (GimpContainerView *view,
   GtkTreeIter           *iter;
   GimpRGB                color;
   gboolean               has_color;
-  const gchar           *icon_name = "system-lock-screen";
+  const gchar           *icon_name;
   gint                   n_locks;
 
   item_view->priv->inserting_item = TRUE;
@@ -1262,34 +1256,6 @@ gimp_item_tree_view_select_items (GimpContainerView *view,
   if (tree_view->priv->options_box)
     gtk_widget_set_sensitive (tree_view->priv->options_box, options_sensitive);
 
-  g_signal_handlers_disconnect_by_func (tree_view->priv->multi_selection_label,
-                    G_CALLBACK (gimp_item_tree_view_selection_label_notify),
-                    tree_view);
-  g_signal_handlers_disconnect_by_func (tree_view->priv->multi_selection_label,
-                    G_CALLBACK (gimp_item_tree_view_selection_label_notify),
-                    tree_view);
-  if (g_list_length (items) > 1)
-    {
-      gchar *str;
-
-      g_signal_connect (tree_view->priv->multi_selection_label, "notify::label",
-                        G_CALLBACK (gimp_item_tree_view_selection_label_notify),
-                        tree_view);
-      g_signal_connect (tree_view->priv->multi_selection_label, "notify::selection-bound",
-                        G_CALLBACK (gimp_item_tree_view_selection_label_notify),
-                        tree_view);
-      str = g_strdup_printf (ngettext ("%d item selected", "%d items selected",
-                                       g_list_length (items)),
-                             g_list_length (items));
-      gtk_label_set_text (GTK_LABEL (tree_view->priv->multi_selection_label), str);
-      g_free (str);
-      gtk_widget_show (tree_view->priv->multi_selection_label);
-    }
-  else
-    {
-      gtk_widget_hide (tree_view->priv->multi_selection_label);
-    }
-
   return success;
 }
 
@@ -1822,7 +1788,7 @@ gimp_item_tree_view_lock_changed (GimpItem         *item,
   GimpContainerView     *container_view  = GIMP_CONTAINER_VIEW (view);
   GimpContainerTreeView *tree_view       = GIMP_CONTAINER_TREE_VIEW (view);
   GtkTreeIter           *iter;
-  const gchar           *icon_name       = "system-lock-screen";
+  const gchar           *icon_name;
   gint                   n_locks;
 
   iter = gimp_container_view_lookup (container_view,
@@ -1968,20 +1934,6 @@ gimp_item_tree_view_item_pre_clicked (GimpCellRendererViewable *cell,
   return handled;
 }
 
-static void
-gimp_item_tree_view_selection_label_notify (GtkLabel         *label,
-                                            GParamSpec       *pspec,
-                                            GimpItemTreeView *view)
-{
-  /* This is a weird trick to make the label follow the color scheme of
-   * selected items in whatever theme is selected. It seems we cannot
-   * link to the color of another widget whose theme we don't control.
-   * Faking selection is the only way I found, though it is quite ugly
-   * semantically.
-   */
-  gtk_label_select_region (label, 0, -1);
-}
-
 static void
 gimp_item_tree_view_update_lock_box (GimpItemTreeView *view,
                                      GimpItem         *item,
@@ -2126,7 +2078,7 @@ gimp_item_tree_view_get_n_locks (GimpItemTreeView *view,
   GList *list;
   gint   n_locks = 0;
 
-  *icon_name = "system-lock-screen";
+  *icon_name = GIMP_ICON_MULTI_LOCK;
 
   for (list = view->priv->locks; list; list = list->next)
     {