mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 08:17:01 +00:00
696 lines
21 KiB
C#
696 lines
21 KiB
C#
// Object.cs - GObject class wrapper implementation
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//
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// Authors: Mike Kestner <mkestner@speakeasy.net>
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//
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// Copyright (c) 2001-2003 Mike Kestner
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// Copyright (c) 2004-2005 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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namespace Gst.GLib {
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Text;
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public class Object : IWrapper, IDisposable {
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IntPtr handle;
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ToggleRef tref;
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bool disposed = false;
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Hashtable data;
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static Hashtable Objects = new Hashtable();
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static ArrayList PendingDestroys = new ArrayList ();
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static bool idle_queued;
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~Object ()
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{
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lock (PendingDestroys) {
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lock (Objects) {
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if (Objects[Handle] is ToggleRef)
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PendingDestroys.Add (Objects [Handle]);
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Objects.Remove (Handle);
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}
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if (!idle_queued){
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Timeout.Add (50, new TimeoutHandler (PerformQueuedUnrefs));
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idle_queued = true;
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}
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}
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}
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern void g_object_unref (IntPtr raw);
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static bool PerformQueuedUnrefs ()
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{
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object [] references;
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lock (PendingDestroys){
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references = new object [PendingDestroys.Count];
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PendingDestroys.CopyTo (references, 0);
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PendingDestroys.Clear ();
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idle_queued = false;
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}
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foreach (ToggleRef r in references)
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r.Free ();
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return false;
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}
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public virtual void Dispose ()
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{
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if (disposed)
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return;
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disposed = true;
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ToggleRef toggle_ref = Objects [Handle] as ToggleRef;
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Objects.Remove (Handle);
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try {
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if (toggle_ref != null)
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toggle_ref.Free ();
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} catch (Exception e) {
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Console.WriteLine ("Exception while disposing a " + this + " in Gtk#");
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throw e;
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}
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handle = IntPtr.Zero;
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GC.SuppressFinalize (this);
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}
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_object_ref (IntPtr raw);
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public static Object GetObject(IntPtr o, bool owned_ref)
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{
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if (o == IntPtr.Zero)
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return null;
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Object obj = null;
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if (Objects.Contains (o)) {
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ToggleRef toggle_ref = Objects [o] as ToggleRef;
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if (toggle_ref != null && toggle_ref.IsAlive)
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obj = toggle_ref.Target;
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}
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if (obj != null && obj.Handle == o) {
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if (owned_ref)
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g_object_unref (obj.Handle);
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return obj;
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}
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if (!owned_ref)
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g_object_ref (o);
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obj = Gst.GLib.ObjectManager.CreateObject(o);
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if (obj == null) {
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g_object_unref (o);
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return null;
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}
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return obj;
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}
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public static Object GetObject(IntPtr o)
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{
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return GetObject (o, false);
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}
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private static void ConnectDefaultHandlers (GType gtype, System.Type t)
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{
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foreach (MethodInfo minfo in t.GetMethods(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.DeclaredOnly)) {
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MethodInfo baseinfo = minfo.GetBaseDefinition ();
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if (baseinfo == minfo)
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continue;
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foreach (object attr in baseinfo.GetCustomAttributes (typeof (DefaultSignalHandlerAttribute), false)) {
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DefaultSignalHandlerAttribute sigattr = attr as DefaultSignalHandlerAttribute;
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MethodInfo connector = sigattr.Type.GetMethod (sigattr.ConnectionMethod, BindingFlags.Static | BindingFlags.NonPublic, null, new Type[] { typeof (GType) }, new ParameterModifier [0]);
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object[] parms = new object [1];
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parms [0] = gtype;
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connector.Invoke (null, parms);
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break;
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}
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}
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}
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private static void InvokeClassInitializers (GType gtype, System.Type t)
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{
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object[] parms = {gtype, t};
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BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
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foreach (TypeInitializerAttribute tia in t.GetCustomAttributes (typeof (TypeInitializerAttribute), true)) {
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MethodInfo m = tia.Type.GetMethod (tia.MethodName, flags);
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if (m != null)
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m.Invoke (null, parms);
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}
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for (Type curr = t; curr != typeof(Gst.GLib.Object); curr = curr.BaseType) {
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if (curr.Assembly.IsDefined (typeof (IgnoreClassInitializersAttribute), false))
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continue;
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foreach (MethodInfo minfo in curr.GetMethods(flags))
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if (minfo.IsDefined (typeof (ClassInitializerAttribute), true))
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minfo.Invoke (null, parms);
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}
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}
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// Key: The pointer to the ParamSpec of the property
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// Value: The corresponding PropertyInfo object
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static Hashtable properties;
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static Hashtable Properties {
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get {
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if (properties == null)
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properties = new Hashtable ();
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return properties;
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}
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}
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struct GTypeClass {
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public IntPtr gtype;
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}
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struct GObjectClass {
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GTypeClass type_class;
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IntPtr construct_props;
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public ConstructorDelegate constructor_cb;
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public SetPropertyDelegate set_prop_cb;
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public GetPropertyDelegate get_prop_cb;
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IntPtr dispose;
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IntPtr finalize;
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IntPtr dispatch_properties_changed;
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IntPtr notify;
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IntPtr constructed;
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IntPtr dummy1;
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IntPtr dummy2;
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IntPtr dummy3;
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IntPtr dummy4;
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IntPtr dummy5;
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IntPtr dummy6;
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IntPtr dummy7;
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}
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[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
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delegate IntPtr ConstructorDelegate (IntPtr gtype, uint n_construct_properties, IntPtr construct_properties);
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static ConstructorDelegate constructor_handler;
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static ConstructorDelegate ConstructorHandler {
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get {
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if (constructor_handler == null)
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constructor_handler = new ConstructorDelegate (ConstructorCallback);
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return constructor_handler;
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}
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}
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_param_spec_get_name (IntPtr pspec);
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static IntPtr ConstructorCallback (IntPtr gtypeval, uint n_construct_properties, IntPtr construct_properties)
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{
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GType gtype = new Gst.GLib.GType (gtypeval);
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GObjectClass threshold_class = (GObjectClass) Marshal.PtrToStructure (gtype.GetThresholdType ().GetClassPtr (), typeof (GObjectClass));
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IntPtr raw = threshold_class.constructor_cb (gtypeval, n_construct_properties, construct_properties);
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bool construct_needed = true;
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for (int i = 0; i < n_construct_properties; i++) {
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IntPtr p = new IntPtr (construct_properties.ToInt64 () + i * 2 * IntPtr.Size);
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string prop_name = Marshaller.Utf8PtrToString (g_param_spec_get_name (Marshal.ReadIntPtr (p)));
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if (prop_name != "gtk-sharp-managed-instance")
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continue;
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Value val = (Value) Marshal.PtrToStructure (Marshal.ReadIntPtr (p, IntPtr.Size), typeof (Value));
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if ((IntPtr) val.Val != IntPtr.Zero) {
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GCHandle gch = (GCHandle) (IntPtr) val.Val;
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Object o = (Gst.GLib.Object) gch.Target;
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o.Raw = raw;
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construct_needed = false;
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break;
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}
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}
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if (construct_needed)
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GetObject (raw, false);
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return raw;
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}
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern void g_object_class_install_property (IntPtr klass, uint prop_id, IntPtr param_spec);
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static IntPtr RegisterProperty (GType type, string name, string nick, string blurb, uint property_id, GType property_type, bool can_read, bool can_write)
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{
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IntPtr declaring_class = type.GetClassPtr ();
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ParamSpec pspec = new ParamSpec (name, nick, blurb, property_type, can_read, can_write);
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g_object_class_install_property (declaring_class, property_id, pspec.Handle);
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return pspec.Handle;
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}
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static void AddProperties (GType gtype, System.Type t, bool register_instance_prop)
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{
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uint idx = 1;
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if (register_instance_prop) {
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IntPtr declaring_class = gtype.GetClassPtr ();
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ParamSpec pspec = new ParamSpec ("gtk-sharp-managed-instance", "", "", GType.Pointer, ParamFlags.Writable | ParamFlags.ConstructOnly);
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g_object_class_install_property (declaring_class, idx, pspec.Handle);
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idx++;
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}
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bool handlers_overridden = register_instance_prop;
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foreach (PropertyInfo pinfo in t.GetProperties (BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly)) {
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foreach (object attr in pinfo.GetCustomAttributes (typeof (PropertyAttribute), false)) {
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if(pinfo.GetIndexParameters().Length > 0)
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throw(new InvalidOperationException(String.Format("Gst.GLib.RegisterPropertyAttribute cannot be applied to property {0} of type {1} because the property expects one or more indexed parameters", pinfo.Name, t.FullName)));
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if (!handlers_overridden) {
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IntPtr class_ptr = gtype.GetClassPtr ();
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GObjectClass gobject_class = (GObjectClass) Marshal.PtrToStructure (class_ptr, typeof (GObjectClass));
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gobject_class.get_prop_cb = GetPropertyHandler;
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gobject_class.set_prop_cb = SetPropertyHandler;
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Marshal.StructureToPtr (gobject_class, class_ptr, false);
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handlers_overridden = true;
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}
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PropertyAttribute property_attr = attr as PropertyAttribute;
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try {
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IntPtr param_spec = RegisterProperty (gtype, property_attr.Name, property_attr.Nickname, property_attr.Blurb, idx, (GType) pinfo.PropertyType, pinfo.CanRead, pinfo.CanWrite);
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Properties.Add (param_spec, pinfo);
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idx++;
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} catch (ArgumentException) {
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throw new InvalidOperationException (String.Format ("Gst.GLib.PropertyAttribute cannot be applied to property {0} of type {1} because the return type of the property is not supported", pinfo.Name, t.FullName));
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}
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}
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}
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}
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[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
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delegate void GetPropertyDelegate (IntPtr GObject, uint property_id, ref Gst.GLib.Value value, IntPtr pspec);
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static void GetPropertyCallback (IntPtr handle, uint property_id, ref Gst.GLib.Value value, IntPtr param_spec)
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{
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if (!Properties.Contains (param_spec))
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return;
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Gst.GLib.Object obj = Gst.GLib.Object.GetObject (handle, false);
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value.Val = (Properties [param_spec] as PropertyInfo).GetValue (obj, new object [0]);
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}
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static GetPropertyDelegate get_property_handler;
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static GetPropertyDelegate GetPropertyHandler {
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get {
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if (get_property_handler == null)
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get_property_handler = new GetPropertyDelegate (GetPropertyCallback);
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return get_property_handler;
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}
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}
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[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
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delegate void SetPropertyDelegate (IntPtr GObject, uint property_id, ref Gst.GLib.Value value, IntPtr pspec);
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static void SetPropertyCallback(IntPtr handle, uint property_id, ref Gst.GLib.Value value, IntPtr param_spec)
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{
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if (!Properties.Contains (param_spec))
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return;
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Gst.GLib.Object obj = Gst.GLib.Object.GetObject (handle, false);
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(Properties [param_spec] as PropertyInfo).SetValue (obj, value.Val, new object [0]);
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}
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static SetPropertyDelegate set_property_handler;
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static SetPropertyDelegate SetPropertyHandler {
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get {
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if (set_property_handler == null)
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set_property_handler = new SetPropertyDelegate (SetPropertyCallback);
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return set_property_handler;
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}
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}
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern void g_type_add_interface_static (IntPtr gtype, IntPtr iface_type, ref GInterfaceInfo info);
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static void AddInterfaces (GType gtype, Type t)
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{
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foreach (Type iface in t.GetInterfaces ()) {
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if (!iface.IsDefined (typeof (GInterfaceAttribute), true) || iface.IsAssignableFrom (t.BaseType))
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continue;
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GInterfaceAttribute attr = iface.GetCustomAttributes (typeof (GInterfaceAttribute), false) [0] as GInterfaceAttribute;
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GInterfaceAdapter adapter = Activator.CreateInstance (attr.AdapterType, null) as GInterfaceAdapter;
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GInterfaceInfo info = adapter.Info;
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g_type_add_interface_static (gtype.Val, adapter.GType.Val, ref info);
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}
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}
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protected internal static GType RegisterGType (System.Type t)
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{
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GType gtype = GType.RegisterGObjectType (t);
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bool is_first_subclass = gtype.GetBaseType () == gtype.GetThresholdType ();
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if (is_first_subclass) {
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IntPtr class_ptr = gtype.GetClassPtr ();
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GObjectClass gobject_class = (GObjectClass) Marshal.PtrToStructure (class_ptr, typeof (GObjectClass));
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gobject_class.constructor_cb = ConstructorHandler;
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gobject_class.get_prop_cb = GetPropertyHandler;
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gobject_class.set_prop_cb = SetPropertyHandler;
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Marshal.StructureToPtr (gobject_class, class_ptr, false);
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}
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AddProperties (gtype, t, is_first_subclass);
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ConnectDefaultHandlers (gtype, t);
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InvokeClassInitializers (gtype, t);
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AddInterfaces (gtype, t);
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return gtype;
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}
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protected GType LookupGType ()
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{
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if (Handle != IntPtr.Zero) {
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GTypeInstance obj = (GTypeInstance) Marshal.PtrToStructure (Handle, typeof (GTypeInstance));
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GTypeClass klass = (GTypeClass) Marshal.PtrToStructure (obj.g_class, typeof (GTypeClass));
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return new Gst.GLib.GType (klass.gtype);
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} else {
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return LookupGType (GetType ());
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}
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}
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protected internal static GType LookupGType (System.Type t)
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{
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return GType.LookupGObjectType (t);
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}
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protected Object (IntPtr raw)
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{
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Raw = raw;
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}
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protected Object ()
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{
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CreateNativeObject (new string [0], new Gst.GLib.Value [0]);
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}
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_object_new (IntPtr gtype, IntPtr dummy);
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struct GParameter {
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public IntPtr name;
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public Gst.GLib.Value val;
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}
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_object_newv (IntPtr gtype, int n_params, GParameter[] parms);
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protected virtual void CreateNativeObject (string[] names, Gst.GLib.Value[] vals)
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{
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GType gtype = LookupGType ();
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bool is_managed_subclass = gtype.ToString ().StartsWith ("__gst_gtksharp");
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GParameter[] parms = new GParameter [is_managed_subclass ? names.Length + 1 : names.Length];
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for (int i = 0; i < names.Length; i++) {
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parms [i].name = Gst.GLib.Marshaller.StringToPtrGStrdup (names [i]);
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parms [i].val = vals [i];
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}
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if (is_managed_subclass) {
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GCHandle gch = GCHandle.Alloc (this);
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parms[names.Length].name = Gst.GLib.Marshaller.StringToPtrGStrdup ("gtk-sharp-managed-instance");
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parms[names.Length].val = new Gst.GLib.Value ((IntPtr) gch);
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Raw = g_object_newv (gtype.Val, parms.Length, parms);
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gch.Free ();
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} else {
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Raw = g_object_newv (gtype.Val, parms.Length, parms);
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}
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foreach (GParameter p in parms)
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Gst.GLib.Marshaller.Free (p.name);
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}
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protected virtual IntPtr Raw {
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get {
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return handle;
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}
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set {
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if (handle == value)
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return;
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if (handle != IntPtr.Zero) {
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Objects.Remove (handle);
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if (tref != null) {
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tref.Free ();
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tref = null;
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}
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}
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handle = value;
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if (value != IntPtr.Zero) {
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tref = new ToggleRef (this);
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Objects [value] = tref;
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}
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}
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}
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public static Gst.GLib.GType GType {
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get {
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return GType.Object;
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}
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}
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protected string TypeName {
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get {
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return NativeType.ToString ();
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}
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}
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internal Gst.GLib.GType NativeType {
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get {
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return LookupGType ();
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}
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}
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internal ToggleRef ToggleRef {
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get {
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return tref;
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}
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}
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public IntPtr Handle {
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get {
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return handle;
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}
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}
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public IntPtr OwnedHandle {
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get {
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return g_object_ref (handle);
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}
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}
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Hashtable before_signals;
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[Obsolete ("Replaced by Gst.GLib.Signal marshaling mechanism.")]
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protected internal Hashtable BeforeSignals {
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get {
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if (before_signals == null)
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before_signals = new Hashtable ();
|
|
return before_signals;
|
|
}
|
|
}
|
|
|
|
Hashtable after_signals;
|
|
[Obsolete ("Replaced by Gst.GLib.Signal marshaling mechanism.")]
|
|
protected internal Hashtable AfterSignals {
|
|
get {
|
|
if (after_signals == null)
|
|
after_signals = new Hashtable ();
|
|
return after_signals;
|
|
}
|
|
}
|
|
|
|
EventHandlerList before_handlers;
|
|
[Obsolete ("Replaced by Gst.GLib.Signal marshaling mechanism.")]
|
|
protected EventHandlerList BeforeHandlers {
|
|
get {
|
|
if (before_handlers == null)
|
|
before_handlers = new EventHandlerList ();
|
|
return before_handlers;
|
|
}
|
|
}
|
|
|
|
EventHandlerList after_handlers;
|
|
[Obsolete ("Replaced by Gst.GLib.Signal marshaling mechanism.")]
|
|
protected EventHandlerList AfterHandlers {
|
|
get {
|
|
if (after_handlers == null)
|
|
after_handlers = new EventHandlerList ();
|
|
return after_handlers;
|
|
}
|
|
}
|
|
|
|
[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
|
|
delegate void NotifyDelegate (IntPtr handle, IntPtr pspec, IntPtr gch);
|
|
|
|
void NotifyCallback (IntPtr handle, IntPtr pspec, IntPtr gch)
|
|
{
|
|
try {
|
|
Gst.GLib.Signal sig = ((GCHandle) gch).Target as Gst.GLib.Signal;
|
|
if (sig == null)
|
|
throw new Exception("Unknown signal GC handle received " + gch);
|
|
|
|
NotifyArgs args = new NotifyArgs ();
|
|
args.Args = new object[1];
|
|
args.Args[0] = pspec;
|
|
NotifyHandler handler = (NotifyHandler) sig.Handler;
|
|
handler (Gst.GLib.Object.GetObject (handle), args);
|
|
} catch (Exception e) {
|
|
ExceptionManager.RaiseUnhandledException (e, false);
|
|
}
|
|
}
|
|
|
|
void ConnectNotification (string signal, NotifyHandler handler)
|
|
{
|
|
Signal sig = Signal.Lookup (this, signal, new NotifyDelegate (NotifyCallback));
|
|
sig.AddDelegate (handler);
|
|
}
|
|
|
|
public void AddNotification (string property, NotifyHandler handler)
|
|
{
|
|
ConnectNotification ("notify::" + property, handler);
|
|
}
|
|
|
|
public void AddNotification (NotifyHandler handler)
|
|
{
|
|
ConnectNotification ("notify", handler);
|
|
}
|
|
|
|
void DisconnectNotification (string signal, NotifyHandler handler)
|
|
{
|
|
Signal sig = Signal.Lookup (this, signal, new NotifyDelegate (NotifyCallback));
|
|
sig.RemoveDelegate (handler);
|
|
}
|
|
|
|
public void RemoveNotification (string property, NotifyHandler handler)
|
|
{
|
|
DisconnectNotification ("notify::" + property, handler);
|
|
}
|
|
|
|
public void RemoveNotification (NotifyHandler handler)
|
|
{
|
|
DisconnectNotification ("notify", handler);
|
|
}
|
|
|
|
public override int GetHashCode ()
|
|
{
|
|
return Handle.GetHashCode ();
|
|
}
|
|
|
|
public Hashtable Data {
|
|
get {
|
|
if (data == null)
|
|
data = new Hashtable ();
|
|
|
|
return data;
|
|
}
|
|
}
|
|
|
|
Hashtable persistent_data;
|
|
protected Hashtable PersistentData {
|
|
get {
|
|
if (persistent_data == null)
|
|
persistent_data = new Hashtable ();
|
|
|
|
return persistent_data;
|
|
}
|
|
}
|
|
|
|
[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
|
|
static extern void g_object_get_property (IntPtr obj, IntPtr name, ref Gst.GLib.Value val);
|
|
|
|
protected Gst.GLib.Value GetProperty (string name)
|
|
{
|
|
Value val = new Value (this, name);
|
|
IntPtr native_name = Gst.GLib.Marshaller.StringToPtrGStrdup (name);
|
|
g_object_get_property (Raw, native_name, ref val);
|
|
Gst.GLib.Marshaller.Free (native_name);
|
|
return val;
|
|
}
|
|
|
|
[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
|
|
static extern void g_object_set_property (IntPtr obj, IntPtr name, ref Gst.GLib.Value val);
|
|
|
|
protected void SetProperty (string name, Gst.GLib.Value val)
|
|
{
|
|
IntPtr native_name = Gst.GLib.Marshaller.StringToPtrGStrdup (name);
|
|
g_object_set_property (Raw, native_name, ref val);
|
|
Gst.GLib.Marshaller.Free (native_name);
|
|
}
|
|
|
|
[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
|
|
static extern void g_object_notify (IntPtr obj, IntPtr property_name);
|
|
|
|
protected void Notify (string property_name)
|
|
{
|
|
IntPtr native_name = Gst.GLib.Marshaller.StringToPtrGStrdup (property_name);
|
|
g_object_notify (Handle, native_name);
|
|
Gst.GLib.Marshaller.Free (native_name);
|
|
}
|
|
|
|
protected static void OverrideVirtualMethod (GType gtype, string name, Delegate cb)
|
|
{
|
|
Signal.OverrideDefaultHandler (gtype, name, cb);
|
|
}
|
|
|
|
[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
|
|
protected static extern void g_signal_chain_from_overridden (IntPtr args, ref Gst.GLib.Value retval);
|
|
|
|
[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
|
|
static extern bool g_type_check_instance_is_a (IntPtr obj, IntPtr gtype);
|
|
|
|
internal static bool IsObject (IntPtr obj)
|
|
{
|
|
return g_type_check_instance_is_a (obj, GType.Object.Val);
|
|
}
|
|
|
|
struct GTypeInstance {
|
|
public IntPtr g_class;
|
|
}
|
|
|
|
struct GObject {
|
|
public GTypeInstance type_instance;
|
|
public uint ref_count;
|
|
public IntPtr qdata;
|
|
}
|
|
|
|
protected int RefCount {
|
|
get {
|
|
GObject native = (GObject) Marshal.PtrToStructure (Handle, typeof (GObject));
|
|
return (int) native.ref_count;
|
|
}
|
|
}
|
|
|
|
internal void Harden ()
|
|
{
|
|
tref.Harden ();
|
|
}
|
|
|
|
static Object ()
|
|
{
|
|
if (Environment.GetEnvironmentVariable ("GTK_SHARP_DEBUG") != null)
|
|
Gst.GLib.Log.SetLogHandler ("Gst.GLib-GObject", Gst.GLib.LogLevelFlags.All, new Gst.GLib.LogFunc (Gst.GLib.Log.PrintTraceLogFunction));
|
|
}
|
|
}
|
|
}
|