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//------------------------------------------------------------------------------
// <copyright file="ExtenderControl.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI {
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Web;
using System.Web.UI;
using System.Web.Resources;
using System.Web.Util;
[
DefaultProperty("TargetControlID"),
Designer("System.Web.UI.Design.ExtenderControlDesigner, " + AssemblyRef.SystemWebExtensionsDesign),
NonVisualControl(),
ParseChildren(true),
PersistChildren(false),
ToolboxItem("System.Web.UI.Design.ExtenderControlToolboxItem, " + AssemblyRef.SystemWebExtensionsDesign),
]
public abstract class ExtenderControl : Control, IExtenderControl {
private string _targetControlID;
private IScriptManagerInternal _scriptManager;
private new IPage _page;
protected ExtenderControl() {
}
internal ExtenderControl(IScriptManagerInternal scriptManager, IPage page) {
_scriptManager = scriptManager;
_page = page;
}
private IPage IPage {
get {
if (_page != null) {
return _page;
}
else {
Page page = Page;
if (page == null) {
throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull);
}
return new PageWrapper(page);
}
}
}
private IScriptManagerInternal ScriptManager {
get {
if (_scriptManager == null) {
Page page = Page;
if (page == null) {
throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull);
}
_scriptManager = System.Web.UI.ScriptManager.GetCurrent(page);
if (_scriptManager == null) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.Common_ScriptManagerRequired, ID));
}
}
return _scriptManager;
}
}
[
Category("Behavior"),
DefaultValue(""),
IDReferenceProperty,
ResourceDescription("ExtenderControl_TargetControlID"),
SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "ID"),
]
public string TargetControlID {
get {
return (_targetControlID == null) ? String.Empty : _targetControlID;
}
set {
_targetControlID = value;
}
}
[
Browsable(false),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
EditorBrowsable(EditorBrowsableState.Never)
]
public override bool Visible {
get {
return base.Visible;
}
set {
throw new NotImplementedException();
}
}
/// <summary>
/// Finds the closest UpdatePanel in the parent controls of the specified control.
/// </summary>
/// <param name="control">The control for which we want the closest UpdatePanel.</param>
/// <returns>An UpdatePanel or null if none was found.</returns>
private static UpdatePanel FindUpdatePanel(Control control) {
Control parent = control.Parent;
while (parent != null) {
UpdatePanel parentPanel = parent as UpdatePanel;
if (parentPanel != null) {
return parentPanel;
}
parent = parent.Parent;
}
return null;
}
[SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")]
protected internal override void OnPreRender(EventArgs e) {
base.OnPreRender(e);
RegisterWithScriptManager();
}
private void RegisterWithScriptManager() {
if (String.IsNullOrEmpty(TargetControlID)) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.ExtenderControl_TargetControlIDEmpty, ID));
}
Control targetControl = FindControl(TargetControlID);
if (targetControl == null) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.ExtenderControl_TargetControlIDInvalid, ID, TargetControlID));
}
// Check if the target control and its extender are in the same UpdatePanel if any:
if (FindUpdatePanel(this) != FindUpdatePanel(targetControl)) {
throw new InvalidOperationException(AtlasWeb.ExtenderControl_TargetControlDifferentUpdatePanel);
}
ScriptManager.RegisterExtenderControl(this, targetControl);
}
protected internal override void Render(HtmlTextWriter writer) {
base.Render(writer);
// DevDiv 97460: ScriptDescriptors only render if in server form, verify to avoid silently failing.
IPage.VerifyRenderingInServerForm(this);
// ScriptManager cannot be found in DesignMode, so do not attempt to register scripts.
if (!DesignMode) {
ScriptManager.RegisterScriptDescriptors(this);
}
}
protected abstract IEnumerable<ScriptDescriptor> GetScriptDescriptors(Control targetControl);
[SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate",
Justification = "Implementation will likely return a new collection, which is too slow for a property")]
protected abstract IEnumerable<ScriptReference> GetScriptReferences();
#region IExtenderControl Members
IEnumerable<ScriptDescriptor> IExtenderControl.GetScriptDescriptors(Control targetControl) {
return GetScriptDescriptors(targetControl);
}
IEnumerable<ScriptReference> IExtenderControl.GetScriptReferences() {
return GetScriptReferences();
}
#endregion
}
}
|
