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//------------------------------------------------------------------------------
// <copyright file="ColumnCollection.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.ComponentModel;
using System.Web.UI;
/// <devdoc>
/// <para>Represents the collection of columns to be displayed in
/// a <see cref='System.Web.UI.WebControls.DataGrid'/>
/// control.</para>
/// </devdoc>
public sealed class DataGridColumnCollection : ICollection, IStateManager {
private DataGrid owner;
private ArrayList columns;
private bool marked;
/// <devdoc>
/// <para>Initializes a new instance of <see cref='System.Web.UI.WebControls.DataGridColumnCollection'/> class.</para>
/// </devdoc>
public DataGridColumnCollection(DataGrid owner, ArrayList columns) {
this.owner = owner;
this.columns = columns;
}
/// <devdoc>
/// <para>Gets the number of columns in the collection. This property is read-only.</para>
/// </devdoc>
[
Browsable(false)
]
public int Count {
get {
return columns.Count;
}
}
/// <devdoc>
/// <para>Gets a value that specifies whether items in the <see cref='System.Web.UI.WebControls.DataGridColumnCollection'/> can be
/// modified. This property is read-only.</para>
/// </devdoc>
[
Browsable(false)
]
public bool IsReadOnly {
get {
return false;
}
}
/// <devdoc>
/// <para>Gets a value that indicates whether the <see cref='System.Web.UI.WebControls.DataGridColumnCollection'/> is thread-safe. This property is read-only.</para>
/// </devdoc>
[
Browsable(false)
]
public bool IsSynchronized {
get {
return false;
}
}
/// <devdoc>
/// <para>Gets the object used to synchronize access to the collection. This property is read-only. </para>
/// </devdoc>
[
Browsable(false)
]
public Object SyncRoot {
get {
return this;
}
}
/// <devdoc>
/// <para>Gets a <see cref='System.Web.UI.WebControls.DataGridColumn'/> at the specified index in the
/// collection.</para>
/// </devdoc>
[
Browsable(false)
]
public DataGridColumn this[int index] {
get {
return (DataGridColumn)columns[index];
}
}
/// <devdoc>
/// <para>Appends a <see cref='System.Web.UI.WebControls.DataGridColumn'/> to the collection.</para>
/// </devdoc>
public void Add(DataGridColumn column) {
AddAt(-1, column);
}
/// <devdoc>
/// <para>Inserts a <see cref='System.Web.UI.WebControls.DataGridColumn'/> to the collection
/// at the specified index.</para>
/// </devdoc>
public void AddAt(int index, DataGridColumn column) {
if (column == null) {
throw new ArgumentNullException("column");
}
if (index == -1) {
columns.Add(column);
}
else {
columns.Insert(index, column);
}
column.SetOwner(owner);
if (marked)
((IStateManager)column).TrackViewState();
OnColumnsChanged();
}
/// <devdoc>
/// <para>Empties the collection of all <see cref='System.Web.UI.WebControls.DataGridColumn'/> objects.</para>
/// </devdoc>
public void Clear() {
columns.Clear();
OnColumnsChanged();
}
/// <devdoc>
/// <para>Copies the contents of the entire collection into an <see cref='System.Array' qualify='true'/> appending at
/// the specified index of the <see cref='System.Array' qualify='true'/>.</para>
/// </devdoc>
public void CopyTo(Array array, int index) {
if (array == null) {
throw new ArgumentNullException("array");
}
for (IEnumerator e = this.GetEnumerator(); e.MoveNext();)
array.SetValue(e.Current, index++);
}
/// <devdoc>
/// <para>Creates an enumerator for the <see cref='System.Web.UI.WebControls.DataGridColumnCollection'/> used to iterate through the collection.</para>
/// </devdoc>
public IEnumerator GetEnumerator() {
return columns.GetEnumerator();
}
/// <devdoc>
/// <para>Returns the index of the first occurrence of a value in a <see cref='System.Web.UI.WebControls.DataGridColumn'/>.</para>
/// </devdoc>
public int IndexOf(DataGridColumn column) {
if (column != null) {
return columns.IndexOf(column);
}
return -1;
}
/// <devdoc>
/// </devdoc>
private void OnColumnsChanged() {
if (owner != null) {
owner.OnColumnsChanged();
}
}
/// <devdoc>
/// <para>Removes a <see cref='System.Web.UI.WebControls.DataGridColumn'/> from the collection at the specified
/// index.</para>
/// </devdoc>
public void RemoveAt(int index) {
if ((index >= 0) && (index < Count)) {
columns.RemoveAt(index);
OnColumnsChanged();
}
else {
throw new ArgumentOutOfRangeException("index");
}
}
/// <devdoc>
/// <para>Removes the specified <see cref='System.Web.UI.WebControls.DataGridColumn'/> from the collection.</para>
/// </devdoc>
public void Remove(DataGridColumn column) {
int index = IndexOf(column);
if (index >= 0) {
RemoveAt(index);
}
}
/// <internalonly/>
/// <devdoc>
/// Return true if tracking state changes.
/// </devdoc>
bool IStateManager.IsTrackingViewState {
get {
return marked;
}
}
/// <internalonly/>
/// <devdoc>
/// Load previously saved state.
/// </devdoc>
void IStateManager.LoadViewState(object savedState) {
if (savedState != null) {
object[] columnsState = (object[])savedState;
if (columnsState.Length == columns.Count) {
for (int i = 0; i < columnsState.Length; i++) {
if (columnsState[i] != null) {
((IStateManager)columns[i]).LoadViewState(columnsState[i]);
}
}
}
}
}
/// <internalonly/>
/// <devdoc>
/// Start tracking state changes.
/// </devdoc>
void IStateManager.TrackViewState() {
marked = true;
int columnCount = columns.Count;
for (int i = 0; i < columnCount; i++) {
((IStateManager)columns[i]).TrackViewState();
}
}
/// <internalonly/>
/// <devdoc>
/// Return object containing state changes.
/// </devdoc>
object IStateManager.SaveViewState() {
int columnCount = columns.Count;
object[] columnsState = new object[columnCount];
bool savedState = false;
for (int i = 0; i < columnCount; i++) {
columnsState[i] = ((IStateManager)columns[i]).SaveViewState();
if (columnsState[i] != null)
savedState = true;
}
return savedState ? columnsState : null;
}
}
}
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