gstreamer/subprojects/gstreamer-sharp/sources/custom/Object.cs

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//
// Authors:
// Andrés G. Aragoneses <knocte@gmail.com>
// Sebastian Dröge <slomo@circular-chaos.org>
// Stephan Sundermann <stephansundermann@gmail.com>
//
// Copyright (c) 2009 Sebastian Dröge
// Copyright (c) 2013 Andrés G. Aragoneses
// Copyright (C) 2013 Stephan Sundermann
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301 USA
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace Gst {
public class PropertyNotFoundException : Exception { }
[StructLayout(LayoutKind.Sequential)]
struct GstObject {
IntPtr _lock;
public string name;
public Object parent;
public uint flags;
IntPtr controlBindings;
public int control_rate;
public int last_sync;
private IntPtr[] _gstGstReserved;
}
partial class Object {
private Dictionary<string, bool> PropertyNameCache = new Dictionary<string, bool>();
[DllImport("gobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
static extern IntPtr g_object_class_find_property(IntPtr klass, IntPtr name);
bool PropertyExists(string name) {
if (PropertyNameCache.ContainsKey(name))
return PropertyNameCache[name];
IntPtr native_name = GLib.Marshaller.StringToPtrGStrdup(name);
var ptr = g_object_class_find_property(Marshal.ReadIntPtr(Handle), native_name);
var result = ptr != IntPtr.Zero;
// just cache the positive results because there might
// actually be new properties getting installed
if (result)
PropertyNameCache[name] = result;
GLib.Marshaller.Free(native_name);
return result;
}
public object this[string property] {
get {
if (PropertyExists(property)) {
using (GLib.Value v = GetProperty(property)) {
return v.Val;
}
}
else
throw new PropertyNotFoundException();
}
set {
if (PropertyExists(property)) {
if (value == null) {
throw new ArgumentNullException();
}
var type = value.GetType();
var gtype = (GLib.GType)type;
if (gtype == null) {
throw new Exception("Could not find a GType for type " + type.FullName);
}
GLib.Value v = new GLib.Value((GLib.GType)value.GetType());
v.Val = value;
SetProperty(property, v);
v.Dispose();
}
else
throw new PropertyNotFoundException();
}
}
public void Connect(string signal, SignalHandler handler) {
DynamicSignal.Connect(this, signal, handler);
}
public void Disconnect(string signal, SignalHandler handler) {
DynamicSignal.Disconnect(this, signal, handler);
}
public void Connect(string signal, Delegate handler) {
DynamicSignal.Connect(this, signal, handler);
}
public void Disconnect(string signal, Delegate handler) {
DynamicSignal.Disconnect(this, signal, handler);
}
public object Emit(string signal, params object[] parameters) {
return DynamicSignal.Emit(this, signal, parameters);
}
}
}