[gimp] app: construct tool-options GUI lazily

[Ell <ell src gnome org>]

commit c1347a7f267839554e648da09dc045d5082103cb
Author: Ell <ell_se yahoo com>
Date:   Thu Sep 27 02:31:39 2018 -0400

    app: construct tool-options GUI lazily
    
    We currently construct the tool-options GUI for all the tools at
    startup, which takes a significant amount of time.  Instead,
    only register the GUI construction function with the tool-options
    object, using the new gimp_tools_set_tool_options_gui_func()
    function, and use the registered function to construct the GUI when
    actually needed.

 app/tools/gimp-tools.c          | 30 ++++--------------------
 app/tools/gimptooloptions-gui.c | 19 +++++++++++++++
 app/tools/gimptooloptions-gui.h |  3 ++-
 app/tools/tools-types.h         |  2 --
 app/widgets/gimpwidgets-utils.c | 52 ++++++++++++++++++++++++++++++++++++-----
 app/widgets/gimpwidgets-utils.h |  3 +++
 app/widgets/widgets-types.h     |  2 ++
 po/POTFILES.in                  |  2 +-
 8 files changed, 77 insertions(+), 36 deletions(-)
---
diff --git a/app/tools/gimp-tools.c b/app/tools/gimp-tools.c
index 17b8d8822d..16d41de588 100644
--- a/app/tools/gimp-tools.c
+++ b/app/tools/gimp-tools.c
@@ -87,8 +87,6 @@
 #include "gimpvectortool.h"
 #include "gimpwarptool.h"
 
-#include "gimp-intl.h"
-
 
 /*  local function prototypes  */
 
@@ -244,10 +242,7 @@ gimp_tools_exit (Gimp *gimp)
        list = g_list_next (list))
     {
       GimpToolInfo *tool_info = list->data;
-      GtkWidget    *options_gui;
 
-      options_gui = gimp_tools_get_tool_options_gui (tool_info->tool_options);
-      gtk_widget_destroy (options_gui);
       gimp_tools_set_tool_options_gui (tool_info->tool_options, NULL);
     }
 }
@@ -353,7 +348,6 @@ gimp_tools_restore (Gimp *gimp)
     {
       GimpToolInfo           *tool_info = GIMP_TOOL_INFO (list->data);
       GimpToolOptionsGUIFunc  options_gui_func;
-      GtkWidget              *options_gui;
 
       /*  copy all context properties except those the tool actually
        *  uses, because the subsequent deserialize() on the tool
@@ -374,27 +368,11 @@ gimp_tools_restore (Gimp *gimp)
       options_gui_func = g_object_get_data (G_OBJECT (tool_info),
                                             "gimp-tool-options-gui-func");
 
-      if (options_gui_func)
-        {
-          options_gui = (* options_gui_func) (tool_info->tool_options);
-        }
-      else
-        {
-          GtkWidget *label;
-
-          options_gui = gimp_tool_options_gui (tool_info->tool_options);
-
-          label = gtk_label_new (_("This tool has\nno options."));
-          gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_CENTER);
-          gimp_label_set_attributes (GTK_LABEL (label),
-                                     PANGO_ATTR_STYLE, PANGO_STYLE_ITALIC,
-                                     -1);
-          gtk_box_pack_start (GTK_BOX (options_gui), label, FALSE, FALSE, 6);
-          gtk_widget_show (label);
-        }
+      if (! options_gui_func)
+        options_gui_func = gimp_tool_options_empty_gui;
 
-      gimp_tools_set_tool_options_gui (tool_info->tool_options,
-                                       g_object_ref_sink (options_gui));
+      gimp_tools_set_tool_options_gui_func (tool_info->tool_options,
+                                            options_gui_func);
     }
 }
 
diff --git a/app/tools/gimptooloptions-gui.c b/app/tools/gimptooloptions-gui.c
index 3776cf22c1..7e0ef3ebd0 100644
--- a/app/tools/gimptooloptions-gui.c
+++ b/app/tools/gimptooloptions-gui.c
@@ -28,6 +28,8 @@
 
 #include "gimptooloptions-gui.h"
 
+#include "gimp-intl.h"
+
 
 /*  public functions  */
 
@@ -42,3 +44,20 @@ gimp_tool_options_gui (GimpToolOptions *tool_options)
 
   return vbox;
 }
+
+GtkWidget *
+gimp_tool_options_empty_gui (GimpToolOptions *tool_options)
+{
+  GtkWidget *vbox = gimp_tool_options_gui (tool_options);
+  GtkWidget *label;
+
+  label = gtk_label_new (_("This tool has\nno options."));
+  gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_CENTER);
+  gimp_label_set_attributes (GTK_LABEL (label),
+                             PANGO_ATTR_STYLE, PANGO_STYLE_ITALIC,
+                             -1);
+  gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 6);
+  gtk_widget_show (label);
+
+  return vbox;
+}
diff --git a/app/tools/gimptooloptions-gui.h b/app/tools/gimptooloptions-gui.h
index 0867c28444..5847e92739 100644
--- a/app/tools/gimptooloptions-gui.h
+++ b/app/tools/gimptooloptions-gui.h
@@ -19,7 +19,8 @@
 #define __GIMP_TOOL_OPTIONS_GUI_H__
 
 
-GtkWidget * gimp_tool_options_gui (GimpToolOptions *tool_options);
+GtkWidget * gimp_tool_options_gui       (GimpToolOptions *tool_options);
+GtkWidget * gimp_tool_options_empty_gui (GimpToolOptions *tool_options);
 
 
 #endif  /*  __GIMP_TOOL_OPTIONS_GUI_H__  */
diff --git a/app/tools/tools-types.h b/app/tools/tools-types.h
index 0e32b4b7a3..ea115ba88b 100644
--- a/app/tools/tools-types.h
+++ b/app/tools/tools-types.h
@@ -45,8 +45,6 @@ typedef struct _GimpFilterOptions            GimpFilterOptions;
 
 /*  functions  */
 
-typedef GtkWidget * (* GimpToolOptionsGUIFunc) (GimpToolOptions *tool_options);
-
 typedef void (* GimpToolRegisterCallback) (GType                     tool_type,
                                            GType                     tool_option_type,
                                            GimpToolOptionsGUIFunc    options_gui_func,
diff --git a/app/widgets/gimpwidgets-utils.c b/app/widgets/gimpwidgets-utils.c
index 4c500c539a..2114b332df 100644
--- a/app/widgets/gimpwidgets-utils.c
+++ b/app/widgets/gimpwidgets-utils.c
@@ -58,7 +58,8 @@
 #include "gimp-intl.h"
 
 
-#define GIMP_TOOL_OPTIONS_GUI_KEY "gimp-tool-options-gui"
+#define GIMP_TOOL_OPTIONS_GUI_KEY      "gimp-tool-options-gui"
+#define GIMP_TOOL_OPTIONS_GUI_FUNC_KEY "gimp-tool-options-gui-func"
 
 
 GtkWidget *
@@ -1426,20 +1427,59 @@ gimp_dock_with_window_new (GimpDialogFactory *factory,
 GtkWidget *
 gimp_tools_get_tool_options_gui (GimpToolOptions *tool_options)
 {
-  return g_object_get_data (G_OBJECT (tool_options),
-                            GIMP_TOOL_OPTIONS_GUI_KEY);
+  GtkWidget *widget;
+
+  widget = g_object_get_data (G_OBJECT (tool_options),
+                              GIMP_TOOL_OPTIONS_GUI_KEY);
+
+  if (! widget)
+    {
+      GimpToolOptionsGUIFunc func;
+
+      func = g_object_get_data (G_OBJECT (tool_options),
+                                GIMP_TOOL_OPTIONS_GUI_FUNC_KEY);
+
+      if (func)
+        {
+          widget = func (tool_options);
+
+          gimp_tools_set_tool_options_gui (tool_options, widget);
+        }
+    }
+
+  return widget;
 }
 
 void
-gimp_tools_set_tool_options_gui (GimpToolOptions   *tool_options,
-                                 GtkWidget         *widget)
+gimp_tools_set_tool_options_gui (GimpToolOptions *tool_options,
+                                 GtkWidget       *widget)
 {
+  GtkWidget *prev_widget;
+
+  prev_widget = g_object_get_data (G_OBJECT (tool_options),
+                                   GIMP_TOOL_OPTIONS_GUI_KEY);
+
+  if (widget == prev_widget)
+    return;
+
+  if (prev_widget)
+    gtk_widget_destroy (prev_widget);
+
   g_object_set_data_full (G_OBJECT (tool_options),
                           GIMP_TOOL_OPTIONS_GUI_KEY,
-                          widget,
+                          widget ? g_object_ref_sink (widget)      : NULL,
                           widget ? (GDestroyNotify) g_object_unref : NULL);
 }
 
+void
+gimp_tools_set_tool_options_gui_func (GimpToolOptions        *tool_options,
+                                      GimpToolOptionsGUIFunc  func)
+{
+  g_object_set_data (G_OBJECT (tool_options),
+                     GIMP_TOOL_OPTIONS_GUI_FUNC_KEY,
+                     func);
+}
+
 gboolean
 gimp_widget_get_fully_opaque (GtkWidget *widget)
 {
diff --git a/app/widgets/gimpwidgets-utils.h b/app/widgets/gimpwidgets-utils.h
index e7d3fdfc21..c1db78d368 100644
--- a/app/widgets/gimpwidgets-utils.h
+++ b/app/widgets/gimpwidgets-utils.h
@@ -95,6 +95,9 @@ GtkWidget       * gimp_dock_with_window_new        (GimpDialogFactory    *factor
 GtkWidget       * gimp_tools_get_tool_options_gui  (GimpToolOptions      *tool_options);
 void              gimp_tools_set_tool_options_gui  (GimpToolOptions      *tool_options,
                                                     GtkWidget            *widget);
+void              gimp_tools_set_tool_options_gui_func
+                                                   (GimpToolOptions      *tool_options,
+                                                    GimpToolOptionsGUIFunc func);
 
 gboolean          gimp_widget_get_fully_opaque     (GtkWidget            *widget);
 void              gimp_widget_set_fully_opaque     (GtkWidget            *widget,
diff --git a/app/widgets/widgets-types.h b/app/widgets/widgets-types.h
index a00245aad7..331fea54e4 100644
--- a/app/widgets/widgets-types.h
+++ b/app/widgets/widgets-types.h
@@ -310,5 +310,7 @@ typedef gboolean    (* GimpPanedBoxDroppedFunc)      (GtkWidget         *noteboo
                                                       gint               insert_index,
                                                       gpointer           data);
 
+typedef GtkWidget * (* GimpToolOptionsGUIFunc)       (GimpToolOptions   *tool_options);
+
 
 #endif /* __WIDGETS_TYPES_H__ */
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 70bbc59337..614402f00e 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -403,7 +403,6 @@ app/text/gimptextlayer-xcf.c
 app/text/gimptextlayout.c
 app/text/text-enums.c
 
-app/tools/gimp-tools.c
 app/tools/gimpairbrushtool.c
 app/tools/gimpalignoptions.c
 app/tools/gimpaligntool.c
@@ -487,6 +486,7 @@ app/tools/gimptexttool.c
 app/tools/gimptexttool-editor.c
 app/tools/gimpthresholdtool.c
 app/tools/gimptool.c
+app/tools/gimptooloptions-gui.c
 app/tools/gimptransformgridoptions.c
 app/tools/gimptransformgridtool.c
 app/tools/gimptransformoptions.c