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//------------------------------------------------------------------------------
// <copyright file="WebPartZone.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls.WebParts {
using System;
using System.Collections;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;
/// <devdoc>
/// Zone that hosts WebPart controls, and contains a template to specify the contained WebParts.
/// </devdoc>
[
Designer("System.Web.UI.Design.WebControls.WebParts.WebPartZoneDesigner, " + AssemblyRef.SystemDesign),
SupportsEventValidation,
]
public class WebPartZone : WebPartZoneBase {
private ITemplate _zoneTemplate;
private bool _registrationComplete;
[
Browsable(false),
DefaultValue(null),
PersistenceMode(PersistenceMode.InnerProperty),
TemplateInstance(TemplateInstance.Single)
]
public virtual ITemplate ZoneTemplate {
get {
return _zoneTemplate;
}
set {
if (!DesignMode) {
if (_registrationComplete) {
throw new InvalidOperationException(SR.GetString(SR.WebPart_SetZoneTemplateTooLate));
}
}
_zoneTemplate = value;
}
}
private void AddWebPartToList(WebPartCollection webParts, Control control) {
WebPart part = control as WebPart;
// We used to throw an exception if the template contained a non-whitespace literal.
// However, sometimes Venus would insert <br /> tags between the server controls
// in the template. So, we now just ignore all literals.
if ((part == null) && !(control is LiteralControl)) {
WebPartManager manager = WebPartManager;
if (manager != null) {
part = manager.CreateWebPart(control);
}
else {
part = WebPartManager.CreateWebPartStatic(control);
}
}
if (part != null) {
webParts.Add(part);
}
}
protected internal override WebPartCollection GetInitialWebParts() {
WebPartCollection webParts = new WebPartCollection();
if (ZoneTemplate != null) {
// PERF: Instantiate the template into a special control, that does nothing when a child control
// is added. This is more performant because the child control is never parented to the temporary
// control, it's ID is never generated, etc.
Control container = new NonParentingControl();
ZoneTemplate.InstantiateIn(container);
if (container.HasControls()) {
ControlCollection controls = container.Controls;
foreach (Control control in controls) {
if (control is ContentPlaceHolder) {
if (control.HasControls()) {
Control[] children = new Control[control.Controls.Count];
control.Controls.CopyTo(children, 0);
foreach (Control child in children) {
AddWebPartToList(webParts, child);
}
}
}
else {
AddWebPartToList(webParts, control);
}
}
}
}
return webParts;
}
protected internal override void OnInit(EventArgs e) {
base.OnInit(e);
_registrationComplete = true;
}
}
}
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