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//
// System.Web.UI.WebControls.BaseDataBoundControl.cs
//
// Authors:
// Lluis Sanchez Gual (lluis@novell.com)
//
// Copyright (C) 2004-2010 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections;
using System.ComponentModel;
using System.Security.Permissions;
namespace System.Web.UI.WebControls
{
// CAS
[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
// attributes
[DefaultProperty ("DataSourceID")]
[DesignerAttribute ("System.Web.UI.Design.WebControls.BaseDataBoundControlDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
public abstract class BaseDataBoundControl: WebControl
{
static readonly object dataBoundEvent = new object ();
EventHandlerList events = new EventHandlerList ();
object dataSource;
bool initialized;
bool preRendered;
bool requiresDataBinding;
public event EventHandler DataBound {
add { events.AddHandler (dataBoundEvent, value); }
remove { events.RemoveHandler (dataBoundEvent, value); }
}
protected BaseDataBoundControl ()
{
}
/* Used for controls that used to inherit from
* WebControl, so the tag can propagate upwards
*/
internal BaseDataBoundControl (HtmlTextWriterTag tag) : base (tag)
{
}
[BindableAttribute (true)]
[ThemeableAttribute (false)]
[DefaultValueAttribute (null)]
[DesignerSerializationVisibilityAttribute (DesignerSerializationVisibility.Hidden)]
public virtual object DataSource {
get { return dataSource; }
set {
if(value!=null)
ValidateDataSource (value);
dataSource = value;
OnDataPropertyChanged ();
}
}
[DefaultValueAttribute ("")]
[ThemeableAttribute (false)]
public virtual string DataSourceID {
get { return ViewState.GetString ("DataSourceID", String.Empty); }
set {
ViewState["DataSourceID"] = value;
OnDataPropertyChanged ();
}
}
protected bool Initialized {
get { return initialized; }
}
protected bool IsBoundUsingDataSourceID {
get { return DataSourceID.Length > 0; }
}
protected bool RequiresDataBinding {
get { return requiresDataBinding; }
set {
// MSDN: If you set the RequiresDataBinding
// property to true when the data-bound control
// has already begun to render its output to the
// page, the current HTTP request is not a
// callback, and you are using the DataSourceID
// property to identify the data source control
// to bind to, the DataBind method is called
// immediately. In this case, the
// RequiresDataBinding property is _not_ actually
// set to true.
//
// LAMESPEC, the docs quoted above mention that
// DataBind is called in the described
// case. This is wrong since that way we don't
// break recursion when the property is set from
// within the OnSelect handler in user's
// code. EnsureDataBound makes sure that no
// recursive binding is performed. Also the
// property DOES get set in this case (according
// to tests)
if (value && preRendered && IsBoundUsingDataSourceID && Page != null && !Page.IsCallback) {
requiresDataBinding = true;
EnsureDataBound ();
} else
requiresDataBinding = value;
}
}
public override bool SupportsDisabledAttribute {
get { return RenderingCompatibilityLessThan40; }
}
protected void ConfirmInitState ()
{
initialized = true;
}
public override void DataBind ()
{
PerformSelect ();
}
protected virtual void EnsureDataBound ()
{
if (RequiresDataBinding && IsBoundUsingDataSourceID)
DataBind ();
}
protected virtual void OnDataBound (EventArgs e)
{
EventHandler eh = events [dataBoundEvent] as EventHandler;
if (eh != null)
eh (this, e);
}
protected virtual void OnDataPropertyChanged ()
{
if (Initialized)
RequiresDataBinding = true;
}
protected internal override void OnInit (EventArgs e)
{
base.OnInit (e);
Page.PreLoad += new EventHandler (OnPagePreLoad);
if (!IsViewStateEnabled && Page != null && Page.IsPostBack)
RequiresDataBinding = true;
}
protected virtual void OnPagePreLoad (object sender, EventArgs e)
{
ConfirmInitState ();
}
protected internal override void OnPreRender (EventArgs e)
{
preRendered = true;
EnsureDataBound ();
base.OnPreRender (e);
}
internal Control FindDataSource ()
{
Control ctrl;
Control namingContainer = NamingContainer;
string dataSourceID = DataSourceID;
while (namingContainer != null) {
ctrl = namingContainer.FindControl (dataSourceID);
if (ctrl != null)
return ctrl;
namingContainer = namingContainer.NamingContainer;
}
return null;
}
protected abstract void PerformSelect ();
protected abstract void ValidateDataSource (object dataSource);
}
}
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