lib/gtk/v3_4/gdk.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # Services from GDK
  16 module gdk is pkgconfig "gtk+-3.0"
  17
  18 import gtk_core
  19
  20 `{
  21 #ifdef GdkCallback_run
  22         // Callback to GdkCallaback::run
  23         gboolean nit_gdk_callback(gpointer user_data) {
  24                 GdkCallback_decr_ref(user_data);
  25                 return GdkCallback_run(user_data);
  26         }
  27 #endif
  28 `}
  29
  30 # Callback to pass to `gdk_threads_add_idle`
  31 class GdkCallback
  32
  33         # Small unit of code executed by the GDK loop when idle
  34         #
  35         # Returns true if this object should be invoked again.
  36         fun run: Bool do return false
  37 end
  38
  39 # Add a callback to execute whenever there are no higher priority events pending
  40 fun gdk_threads_add_idle(callback: GdkCallback): Int import GdkCallback.run `{
  41         GdkCallback_incr_ref(callback);
  42         return gdk_threads_add_idle(&nit_gdk_callback, callback);
  43 `}