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using System;
using System.Runtime.InteropServices;
using GLib;
internal static class GTypeExtensions
{
public static IntPtr ValFromInstancePtr (IntPtr handle)
{
if (handle == IntPtr.Zero)
return IntPtr.Zero;
// First field of instance is a GTypeClass*.
IntPtr klass = Marshal.ReadIntPtr (handle);
// First field of GTypeClass is a GType.
return Marshal.ReadIntPtr (klass);
}
public static bool IsInstance (GType type, IntPtr raw)
{
return Is (ValFromInstancePtr (raw), type);
}
public static bool Is (IntPtr type, GType is_a_type)
{
return g_type_is_a (type, is_a_type.Val);
}
public static IntPtr GetClassPtr (GType type)
{
IntPtr klass = g_type_class_peek (type.Val);
if (klass == IntPtr.Zero)
klass = g_type_class_ref (type.Val);
return klass;
}
public static GType GetThresholdType (GType type)
{
GLib.GType curr_type = type;
while (curr_type.ToString ().StartsWith ("__gtksharp_")) {
curr_type = GetBaseType (curr_type);
}
return curr_type;
}
public static uint GetClassSize (GType type)
{
GTypeQuery query;
g_type_query (type.Val, out query);
return query.class_size;
}
public static GType GetBaseType (GType type)
{
IntPtr parent = g_type_parent (type.Val);
if (parent == IntPtr.Zero)
return GType.None;
else
return new GType (parent);
}
struct GTypeQuery {
public IntPtr type;
public IntPtr type_name;
public uint class_size;
public uint instance_size;
}
[DllImport ("libgobject-2.0-0.dll")]
static extern bool g_type_is_a (IntPtr type, IntPtr is_a_type);
[DllImport("libgobject-2.0-0.dll")]
static extern IntPtr g_type_class_peek (IntPtr gtype);
[DllImport("libgobject-2.0-0.dll")]
static extern IntPtr g_type_class_ref (IntPtr gtype);
[DllImport("libgobject-2.0-0.dll")]
static extern IntPtr g_type_parent (IntPtr type);
[DllImport("libgobject-2.0-0.dll")]
static extern void g_type_query (IntPtr type, out GTypeQuery query);
}
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