Fix 1814151: "Add a layer inside an exported canvas crash". Check the return value...

[synfig.git] / synfig-studio / trunk / src / gtkmm / state_gradient.cpp

diff --git a/synfig-studio/trunk/src/gtkmm/state_gradient.cpp b/synfig-studio/trunk/src/gtkmm/state_gradient.cpp
index e92a92b..c8461b5 100644 (file)
--- a/synfig-studio/trunk/src/gtkmm/state_gradient.cpp
+++ b/synfig-studio/trunk/src/gtkmm/state_gradient.cpp
@@ -6,6 +6,7 @@
 **
 **     \legal
 **     Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**  Copyright (c) 2008 Chris Moore
 **
 **     This package is free software; you can redistribute it and/or
 **     modify it under the terms of the GNU General Public License as
@@ -403,6 +404,12 @@ StateGradient_Context::make_gradient(const Point& _p1, const Point& _p2)
        case GRADIENT_INTERPOLATION_LINEAR:
 
                layer=get_canvas_interface()->add_layer_to("linear_gradient",canvas,depth);
+               if (!layer)
+               {
+                       get_canvas_view()->get_ui_interface()->error(_("Unable to create layer"));
+                       group.cancel();
+                       return;
+               }
                layer->set_param("p1",p1);
                get_canvas_interface()->signal_layer_param_changed()(layer,"p1");
                layer->set_param("p2",p2);
@@ -410,6 +417,12 @@ StateGradient_Context::make_gradient(const Point& _p1, const Point& _p2)
                break;
        case GRADIENT_RADIAL:
                layer=get_canvas_interface()->add_layer_to("radial_gradient",canvas,depth);
+               if (!layer)
+               {
+                       get_canvas_view()->get_ui_interface()->error(_("Unable to create layer"));
+                       group.cancel();
+                       return;
+               }
                layer->set_param("center",p1);
                get_canvas_interface()->signal_layer_param_changed()(layer,"center");
                layer->set_param("radius",(p2-p1).mag());
@@ -417,6 +430,12 @@ StateGradient_Context::make_gradient(const Point& _p1, const Point& _p2)
                break;
        case GRADIENT_CONICAL:
                layer=get_canvas_interface()->add_layer_to("conical_gradient",canvas,depth);
+               if (!layer)
+               {
+                       get_canvas_view()->get_ui_interface()->error(_("Unable to create layer"));
+                       group.cancel();
+                       return;
+               }
                layer->set_param("center",p1);
                get_canvas_interface()->signal_layer_param_changed()(layer,"center");
                {
@@ -427,6 +446,12 @@ StateGradient_Context::make_gradient(const Point& _p1, const Point& _p2)
                break;
        case GRADIENT_SPIRAL:
                layer=get_canvas_interface()->add_layer_to("spiral_gradient",canvas,depth);
+               if (!layer)
+               {
+                       get_canvas_view()->get_ui_interface()->error(_("Unable to create layer"));
+                       group.cancel();
+                       return;
+               }
                layer->set_param("center",p1);
                get_canvas_interface()->signal_layer_param_changed()(layer,"center");
                layer->set_param("radius",(p2-p1).mag());
@@ -493,6 +518,7 @@ StateGradient_Context::event_mouse_click_handler(const Smach::event& x)
 
        if(event.key==EVENT_WORKAREA_MOUSE_BUTTON_DRAG && event.button==BUTTON_LEFT)
        {
+               if (!point2_duck) return Smach::RESULT_OK;
                point2_duck->set_point(get_work_area()->snap_point_to_grid(event.pos));
                get_work_area()->queue_draw();
                return Smach::RESULT_ACCEPT;