[gimp] app: reset GimpFilterTool widget when resetting settings

[N/A <ell src gnome org>]

commit cada28e91ed1273b4b21d8b96aabf8c56d94773a
Author: Ell <ell_se yahoo com>
Date:   Sun Mar 18 14:14:53 2018 -0400

    app: reset GimpFilterTool widget when resetting settings
    
    Add a gimp_filter_tool_reset_widget() function, which resets the
    tool widget associated with the filter's controller -- i.e., it
    resets those properties of the widget that aren't controlled by the
    op's properties to some "default" state.  For most controller types
    this is a NOP; for transform-grid controllers, we move the pivot
    back to the center of the drawable, w.r.t. the current transform.
    
    Call gimp_filter_tool_reset_widget() after resetting or reloading
    the tool's config.

 app/tools/gimpfiltertool-widgets.c |   62 ++++++++++++++++++++++++++++++++++++
 app/tools/gimpfiltertool-widgets.h |    3 ++
 app/tools/gimpfiltertool.c         |    6 +++
 3 files changed, 71 insertions(+), 0 deletions(-)
---
diff --git a/app/tools/gimpfiltertool-widgets.c b/app/tools/gimpfiltertool-widgets.c
index acbc073..2f78286 100644
--- a/app/tools/gimpfiltertool-widgets.c
+++ b/app/tools/gimpfiltertool-widgets.c
@@ -189,6 +189,68 @@ gimp_filter_tool_create_widget (GimpFilterTool     *filter_tool,
   return controller->widget;
 }
 
+void
+gimp_filter_tool_reset_widget (GimpFilterTool *filter_tool,
+                               GimpToolWidget *widget)
+{
+  Controller *controller;
+
+  g_return_if_fail (GIMP_IS_FILTER_TOOL (filter_tool));
+  g_return_if_fail (GIMP_IS_TOOL_WIDGET (widget));
+
+  controller = g_object_get_data (G_OBJECT (filter_tool->widget),
+                                  "controller");
+
+  g_return_if_fail (controller != NULL);
+
+  switch (controller->controller_type)
+    {
+    case GIMP_CONTROLLER_TYPE_TRANSFORM_GRID:
+      {
+        GimpMatrix3   *transform;
+        gint           off_x, off_y;
+        GeglRectangle  area;
+        gdouble        x1, y1;
+        gdouble        x2, y2;
+        gdouble        pivot_x, pivot_y;
+
+        g_object_get (controller->widget,
+                      "transform", &transform,
+                      NULL);
+
+        gimp_filter_tool_get_drawable_area (filter_tool, &off_x, &off_y, &area);
+
+        x1 = off_x + area.x;
+        y1 = off_y + area.y;
+        x2 = x1 + area.width;
+        y2 = y1 + area.height;
+
+        gimp_matrix3_transform_point (transform,
+                                      (x1 + x2) / 2.0, (y1 + y2) / 2.0,
+                                      &pivot_x, &pivot_y);
+
+        g_signal_handlers_block_by_func (controller->widget,
+                                         gimp_filter_tool_transform_grid_changed,
+                                         controller);
+
+        g_object_set (controller->widget,
+                      "pivot-x", pivot_x,
+                      "pivot-y", pivot_y,
+                      NULL);
+
+        g_signal_handlers_unblock_by_func (controller->widget,
+                                           gimp_filter_tool_transform_grid_changed,
+                                           controller);
+
+        g_free (transform);
+      }
+      break;
+
+    default:
+      break;
+    }
+}
+
 
 /*  private functions  */
 
diff --git a/app/tools/gimpfiltertool-widgets.h b/app/tools/gimpfiltertool-widgets.h
index 91d1831..08c0de0 100644
--- a/app/tools/gimpfiltertool-widgets.h
+++ b/app/tools/gimpfiltertool-widgets.h
@@ -29,5 +29,8 @@ GimpToolWidget * gimp_filter_tool_create_widget (GimpFilterTool     *filter_tool
                                                  GCallback          *set_func,
                                                  gpointer           *set_func_data);
 
+void             gimp_filter_tool_reset_widget  (GimpFilterTool     *filter_tool,
+                                                 GimpToolWidget     *widget);
+
 
 #endif /* __GIMP_FILTER_TOOL_WIDGETS_H__ */
diff --git a/app/tools/gimpfiltertool.c b/app/tools/gimpfiltertool.c
index 3b0bab6..a090c3a 100644
--- a/app/tools/gimpfiltertool.c
+++ b/app/tools/gimpfiltertool.c
@@ -1034,6 +1034,9 @@ gimp_filter_tool_reset (GimpFilterTool *filter_tool)
 
   if (filter_tool->config)
     g_object_thaw_notify (filter_tool->config);
+
+  if (filter_tool->widget)
+    gimp_filter_tool_reset_widget (filter_tool, filter_tool->widget);
 }
 
 static void
@@ -1453,6 +1456,9 @@ gimp_filter_tool_set_config (GimpFilterTool *filter_tool,
   g_return_if_fail (GIMP_IS_SETTINGS (config));
 
   GIMP_FILTER_TOOL_GET_CLASS (filter_tool)->set_config (filter_tool, config);
+
+  if (filter_tool->widget)
+    gimp_filter_tool_reset_widget (filter_tool, filter_tool->widget);
 }
 
 void