add a flag and a setter method for busy cursor

(bzr r2646)

2 files changed, 20 insertions, 0 deletions

diff --git a/src/desktop.cpp b/src/desktop.cpp
index 5fa251842..668d46b31 100644
--- a/src/desktop.cpp
+++ b/src/desktop.cpp
@@ -54,6 +54,7 @@
 
 #include <glibmm/i18n.h>
 #include <sigc++/functors/mem_fun.h>
+#include <gtkmm.h>
 
 #include "macros.h"
 #include "inkscape-private.h"
@@ -127,6 +128,7 @@ SPDesktop::SPDesktop()
     zooms_future = NULL;
 
     is_fullscreen = false;
+    waiting_cursor = false;
 
     gr_item = NULL;
     gr_point_type = 0;
@@ -1070,6 +1072,21 @@ void SPDesktop::disableInteraction()
   _widget->disableInteraction();
 }
 
+void SPDesktop::setWaitingCursor()
+{
+    GdkCursor *waiting = gdk_cursor_new(GDK_WATCH);
+    gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(this))->window, waiting);
+    gdk_cursor_unref(waiting);
+    waiting_cursor = true;
+
+    // Stupidly broken GDK cannot just set the new cursor right now - it needs some main loop iterations for that
+    // Since setting waiting_cursor is usually immediately followed by some Real Work, we must run the iterations here
+    // CAUTION: iterations may redraw, and redraw may be interrupted, so you cannot assume that anything is the same
+    // after the call to setWaitingCursor as it was before
+    while( Gtk::Main::events_pending() )
+       Gtk::Main::iteration();
+}
+
 //----------------------------------------------------------------------
 // Callback implementations. The virtual ones are connected by the view.
 
diff --git a/src/desktop.h b/src/desktop.h
index 9f3d77520..fbc92b7a4 100644
--- a/src/desktop.h
+++ b/src/desktop.h
@@ -99,6 +99,7 @@ struct SPDesktop : public Inkscape::UI::View::View
     unsigned int number;
     bool is_fullscreen;
     unsigned int interaction_disabled_counter;
+    bool waiting_cursor;
 
     /// \todo fixme: This has to be implemented in different way */
     guint guides_active : 1;
@@ -240,6 +241,8 @@ struct SPDesktop : public Inkscape::UI::View::View
     
     void enableInteraction();
     void disableInteraction();
+
+    void setWaitingCursor();
     
     void fullscreen();