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/**
* Namespace: System.Web.UI.WebControls
* Class: DataGridColumnCollection
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
* Implementation: yes
* Status: ??%
*
* (C) Gaurav Vaish (2002)
*/
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
public sealed class DataGridColumnCollection : ICollection, IEnumerable, IStateManager
{
private DataGrid owner;
private ArrayList columns;
private bool trackViewState = false;
public DataGridColumnCollection(DataGrid owner, ArrayList columns)
{
this.owner = owner;
this.columns = columns;
}
public int Count
{
get
{
return columns.Count;
}
}
public bool IsReadOnly
{
get
{
return false;
}
}
public bool IsSynchronized
{
get
{
return false;
}
}
public DataGridColumn this[int index]
{
get
{
return (DataGridColumn)(columns[index]);
}
}
public object SyncRoot
{
get
{
return this;
}
}
public void Add(DataGridColumn column)
{
AddAt(-1, column);
}
public void AddAt(int index, DataGridColumn column)
{
if(index == -1)
{
columns.Add(column);
} else
{
columns.Insert(index, column);
}
//TODO: To put. DataGridColumn class not created!
//column->owner = owner;
if(trackViewState)
{
((IStateManager)column).TrackViewState();
}
OnColumnsChanged();
}
internal void OnColumnsChanged()
{
if(owner != null)
{
owner.OnColumnsChanged();
}
}
public void Clear()
{
columns.Clear();
OnColumnsChanged();
}
public void CopyTo(Array array, int index)
{
foreach(DataGridColumn current in this)
{
array.SetValue(current, index++);
}
}
public IEnumerator GetEnumerator()
{
return columns.GetEnumerator();
}
public int IndexOf(DataGridColumn column)
{
if(column != null)
{
return columns.IndexOf(column);
}
return -1;
}
public void Remove(DataGridColumn column)
{
if(column != null)
{
RemoveAt(IndexOf(column));
}
}
public void RemoveAt(int index)
{
if(index >= 0 && index < columns.Count)
{
columns.RemoveAt(index);
OnColumnsChanged();
}
//This exception is not documented, but thrown
throw new ArgumentOutOfRangeException("string");
}
object IStateManager.SaveViewState()
{
ArrayList retVal = new ArrayList(columns.Count);
foreach(DataGridColumn current in this)
{
retVal.Add(((IStateManager)current).SaveViewState());
}
return retVal;
}
void IStateManager.LoadViewState(object savedState)
{
if(savedState != null && savedState is ArrayList)
{
int currentIndex = 0;
foreach(DataGridColumn current in (ArrayList)savedState)
{
((IStateManager)columns[currentIndex ++]).LoadViewState(current);
}
}
}
void IStateManager.TrackViewState()
{
trackViewState = true;
}
bool IStateManager.IsTrackingViewState
{
get
{
return trackViewState;
}
}
}
}
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