lib/gtk: intro threading system of GDK

[nit.git] / lib / gtk / v3_4 / gdk.nit

diff --git a/lib/gtk/v3_4/gdk.nit b/lib/gtk/v3_4/gdk.nit
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+++ b/lib/gtk/v3_4/gdk.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Services from GDK
+module gdk is pkgconfig "gtk+-3.0"
+
+import gtk_core
+
+`{
+#ifdef GdkCallback_run
+       // Callback to GdkCallaback::run
+       gboolean nit_gdk_callback(gpointer user_data) {
+               GdkCallback_decr_ref(user_data);
+               return GdkCallback_run(user_data);
+       }
+#endif
+`}
+
+# Callback to pass to `gdk_threads_add_idle`
+class GdkCallback
+
+       # Small unit of code executed by the GDK loop when idle
+       #
+       # Returns true if this object should be invoked again.
+       fun run: Bool do return false
+end
+
+# Add a callback to execute whenever there are no higher priority events pending
+fun gdk_threads_add_idle(callback: GdkCallback): Int import GdkCallback.run `{
+       GdkCallback_incr_ref(callback);
+       return gdk_threads_add_idle(&nit_gdk_callback, callback);
+`}