95 lines
2.6 KiB
C#
95 lines
2.6 KiB
C#
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// Author: Mike Kestner <mkestner@novell.com>
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//
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// Copyright (c) 2009 Novell, Inc.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the Lesser GNU General
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// Public License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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using System;
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using System.Runtime.InteropServices;
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namespace Gapi {
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public static class GTypeExtensions {
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[DllImport("libgobject-2.0-0.dll")]
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static extern IntPtr g_type_class_peek (IntPtr gtype);
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[DllImport("libgobject-2.0-0.dll")]
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static extern IntPtr g_type_class_ref (IntPtr gtype);
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public static IntPtr GetClassPtr (this GLib.GType gtype)
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{
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IntPtr klass = g_type_class_peek (gtype.Val);
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if (klass == IntPtr.Zero)
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klass = g_type_class_ref (gtype.Val);
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return klass;
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}
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[DllImport("libgobject-2.0-0.dll")]
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static extern IntPtr g_type_parent (IntPtr type);
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public static GLib.GType GetBaseType (this GLib.GType gtype)
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{
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IntPtr parent = g_type_parent (gtype.Val);
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return parent == IntPtr.Zero ? GLib.GType.None : new GLib.GType (parent);
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}
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public static GLib.GType GetThresholdType (this GLib.GType gtype)
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{
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GLib.GType curr = gtype;
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while (curr.ToString ().StartsWith ("__gtksharp_"))
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curr = GetBaseType (curr);
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return curr;
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}
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struct GTypeQuery {
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public IntPtr type;
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public IntPtr type_name;
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public uint class_size;
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public uint instance_size;
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}
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[DllImport("libgobject-2.0-0.dll")]
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static extern void g_type_query (IntPtr type, out GTypeQuery query);
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public static uint GetClassSize (this GLib.GType gtype)
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{
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GTypeQuery query;
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g_type_query (gtype.Val, out query);
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return query.class_size;
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}
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static IntPtr ValFromInstancePtr (IntPtr handle)
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{
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if (handle == IntPtr.Zero)
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return IntPtr.Zero;
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// First field of instance is a GTypeClass*.
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IntPtr klass = Marshal.ReadIntPtr (handle);
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// First field of GTypeClass is a GType.
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return Marshal.ReadIntPtr (klass);
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}
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[DllImport("libgobject-2.0-0.dll")]
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static extern bool g_type_is_a (IntPtr type, IntPtr is_a_type);
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public static bool IsInstance (this GLib.GType gtype, IntPtr raw)
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{
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return g_type_is_a (ValFromInstancePtr (raw), gtype.Val);
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}
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}
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}
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