GtkSharp/glib/ListBase.cs

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// SList.cs - GSList class wrapper implementation
//
// Authors: Mike Kestner <mkestner@speakeasy.net>
//
// (c) 2002 Mike Kestner
namespace GLib {
using System;
using System.Collections;
using System.Runtime.InteropServices;
/// <summary>
/// ListBase Class
/// </summary>
///
/// <remarks>
/// Base class for GList and GSList.
/// </remarks>
public abstract class ListBase : IDisposable, ICollection, GLib.IWrapper, ICloneable {
private IntPtr list_ptr = IntPtr.Zero;
private int length = -1;
private bool managed = false;
protected System.Type element_type = null;
abstract internal IntPtr GetData (IntPtr current);
abstract internal IntPtr Next (IntPtr current);
abstract internal int Length (IntPtr list);
abstract internal void Free (IntPtr list);
abstract internal IntPtr Append (IntPtr current, IntPtr raw);
abstract internal IntPtr Prepend (IntPtr current, IntPtr raw);
private ListBase ()
{
}
internal ListBase (IntPtr list, System.Type element_type)
{
list_ptr = list;
this.element_type = element_type;
}
internal ListBase (IntPtr list)
{
list_ptr = list;
}
~ListBase ()
{
Dispose (false);
}
public bool Managed {
set { managed = value; }
}
/// <summary>
/// Handle Property
/// </summary>
///
/// <remarks>
/// A raw list reference for marshaling situations.
/// </remarks>
public IntPtr Handle {
get {
return list_ptr;
}
}
internal IntPtr Raw {
get {
return list_ptr;
}
set {
if (managed && list_ptr != IntPtr.Zero)
FreeList ();
list_ptr = value;
}
}
public void Append (IntPtr raw)
{
list_ptr = Append (list_ptr, raw);
}
public void Append (string item)
{
this.Append (Marshal.StringToHGlobalAnsi (item));
}
public void Prepend (IntPtr raw)
{
list_ptr = Prepend (list_ptr, raw);
}
// ICollection
public int Count {
get {
if (length == -1)
length = Length (list_ptr);
return length;
}
}
// Synchronization could be tricky here. Hmm.
public bool IsSynchronized {
get { return false; }
}
public object SyncRoot {
get { return null; }
}
public void CopyTo (Array array, int index)
{
object[] orig = new object[Count];
int i = 0;
foreach (object o in this)
orig[i] = o;
orig.CopyTo (array, index);
}
private class ListEnumerator : IEnumerator
{
private IntPtr current = IntPtr.Zero;
private ListBase list;
public ListEnumerator (ListBase list)
{
this.list = list;
}
public object Current {
get {
IntPtr data = list.GetData (current);
object ret = null;
if (list.element_type != null)
{
if (list.element_type == typeof (string))
ret = Marshal.PtrToStringAnsi (data);
else if (list.element_type == typeof (int))
ret = (int) data;
else if (list.element_type.IsValueType)
ret = Marshal.PtrToStructure (data, list.element_type);
else
ret = Activator.CreateInstance (list.element_type, new object[] {data});
}
else if (Object.IsObject (data))
ret = GLib.Object.GetObject (data, false);
return ret;
}
}
public bool MoveNext ()
{
if (current == IntPtr.Zero)
current = list.list_ptr;
else
current = list.Next (current);
return (current != IntPtr.Zero);
}
public void Reset ()
{
current = IntPtr.Zero;
}
}
// IEnumerable
public IEnumerator GetEnumerator ()
{
return new ListEnumerator (this);
}
// IDisposable
public void Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
protected virtual void Dispose (bool disposing)
{
if (!managed)
return;
FreeList ();
}
void FreeList ()
{
if (list_ptr != IntPtr.Zero)
Free (list_ptr);
list_ptr = IntPtr.Zero;
length = -1;
}
// ICloneable
abstract public object Clone ();
}
}