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/**
* Namespace: System.Web.UI.WebControls
* Class: CheckBoxList
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <gvaish@iitk.ac.in>
* Implementation: yes
* Status: 100%
*
* (C) Gaurav Vaish (2001)
*/
using System;
using System.Collections.Specialized;
using System.Globalization;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
public class CheckBoxList: ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler
{
CheckBox checkBoxRepeater;
bool isChangeNotified;
public CheckBoxList()
{
checkBoxRepeater = new CheckBox();
checkBoxRepeater.ID = "0";
checkBoxRepeater.EnableViewState = false;
checkBoxRepeater.Controls.Add(this);
isChangeNotified = false;
}
public virtual int CellPadding
{
get
{
return (ControlStyleCreated ? ((TableStyle)ControlStyle).CellPadding : -1);
}
set
{
((TableStyle)ControlStyle).CellPadding = value;
}
}
public virtual int CellSpacing
{
get
{
return (ControlStyleCreated ? ((TableStyle)ControlStyle).CellSpacing : -1);
}
set
{
((TableStyle)ControlStyle).CellSpacing = value;
}
}
public virtual int RepeatColumns
{
get
{
object o = ViewState["RepeatColumns"];
if(o!=null)
return (int)o;
return 0;
}
set
{
if(value < 0)
throw new ArgumentOutOfRangeException();
ViewState["RepeatColumns"] = value;
}
}
public virtual RepeatDirection RepeatDirection
{
get
{
object o = ViewState["RepeatDirection"];
if(o!=null)
return (RepeatDirection)o;
return RepeatDirection.Vertical;
}
set
{
if(!System.Enum.IsDefined(typeof(RepeatDirection),value))
throw new ArgumentException();
ViewState["RepeatDirection"] = value;
}
}
public virtual RepeatLayout RepeatLayout
{
get
{
object o = ViewState["RepeatLayout"];
if(o!=null)
return (RepeatLayout)o;
return RepeatLayout.Table;
}
set
{
if(!System.Enum.IsDefined(typeof(RepeatLayout), value))
throw new ArgumentException();
ViewState["RepeatLayout"] = value;
}
}
public virtual TextAlign TextAlign
{
get
{
object o = ViewState["TextAlign"];
if(o!=null)
return (TextAlign)o;
return TextAlign.Right;
}
set
{
if(!Enum.IsDefined(typeof(TextAlign), value))
throw new ArgumentException();
ViewState["TextAlign"] = value;
}
}
protected override Style CreateControlStyle()
{
return new TableStyle(ViewState);
}
protected override Control FindControl(string id, int pathOffset)
{
return this;
}
protected override void OnPreRender(EventArgs e)
{
checkBoxRepeater.AutoPostBack = AutoPostBack;
if(Page!=null)
{
for(int i=0; i < Items.Count; i++)
{
if(Items[i].Selected)
{
checkBoxRepeater.ID = i.ToString(NumberFormatInfo.InvariantInfo);
Page.RegisterRequiresPostBack(checkBoxRepeater);
}
}
}
}
protected override void Render(HtmlTextWriter writer)
{
RepeatInfo ri = new RepeatInfo();
checkBoxRepeater.TabIndex = TabIndex;
bool dirtyFlag = false;
short tTabIndex = TabIndex;
Style s = (ControlStyleCreated ? ControlStyle : null);
if(TabIndex > 0)
{
if(!ViewState.IsItemDirty("TabIndex"))
dirtyFlag = true;
TabIndex = 0;
}
ri.RepeatColumns = RepeatColumns;
ri.RepeatLayout = RepeatLayout;
ri.RepeatDirection = RepeatDirection;
ri.RenderRepeater(writer, this, s, this);
if(tTabIndex > 0)
{
TabIndex = tTabIndex;
}
if(dirtyFlag)
{
ViewState.SetItemDirty("TabIndex", false);
}
}
bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
{
int index = Int32.Parse(postDataKey.Substring(UniqueID.Length + 1));
if(index >= 0 && index < Items.Count)
{
bool exists = (postCollection[postDataKey]!=null);
if(Items[index].Selected != exists)
{
Items[index].Selected = exists;
if(!isChangeNotified)
{
isChangeNotified = true;
return true;
}
}
}
return false;
}
void IPostBackDataHandler.RaisePostDataChangedEvent()
{
OnSelectedIndexChanged(EventArgs.Empty);
}
bool IRepeatInfoUser.HasFooter
{
get
{
return false;
}
}
bool IRepeatInfoUser.HasHeader
{
get
{
return false;
}
}
bool IRepeatInfoUser.HasSeparators
{
get
{
return false;
}
}
int IRepeatInfoUser.RepeatedItemCount
{
get
{
return Items.Count;
}
}
Style IRepeatInfoUser.GetItemStyle(ListItemType itemType, int repeatIndex)
{
return null;
}
void IRepeatInfoUser.RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer)
{
checkBoxRepeater.ID = repeatIndex.ToString(NumberFormatInfo.InvariantInfo);
checkBoxRepeater.Text = Items[repeatIndex].Text;
checkBoxRepeater.TextAlign = TextAlign;
checkBoxRepeater.Checked = Items[repeatIndex].Selected;
checkBoxRepeater.RenderControl(writer);
}
}
}
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