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//------------------------------------------------------------------------------
// <copyright file="HyperLinkColumn.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.Globalization;
using System.Web;
using System.Web.UI;
using System.Web.Util;
/// <devdoc>
/// <para>Creates a column within the <see cref='System.Web.UI.WebControls.DataGrid'/> containing hyperlinks that
/// navigate to specified URLs.</para>
/// </devdoc>
public class HyperLinkColumn : DataGridColumn {
private PropertyDescriptor textFieldDesc;
private PropertyDescriptor urlFieldDesc;
/// <devdoc>
/// <para>Initializes a new instance of the <see cref='System.Web.UI.WebControls.HyperLinkColumn'/> class.</para>
/// </devdoc>
public HyperLinkColumn() {
}
/// <devdoc>
/// <para>Gets or sets the field in the DataSource that provides the URL of the page to navigate to.</para>
/// </devdoc>
[
WebCategory("Data"),
DefaultValue(""),
WebSysDescription(SR.HyperLinkColumn_DataNavigateUrlField)
]
public virtual string DataNavigateUrlField {
get {
object o = ViewState["DataNavigateUrlField"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
ViewState["DataNavigateUrlField"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the formatting applied to the <see cref='System.Web.UI.WebControls.HyperLinkColumn.NavigateUrl'/>
/// property.</para>
/// </devdoc>
[
WebCategory("Data"),
DefaultValue(""),
DescriptionAttribute("The formatting applied to the value bound to the NavigateUrl property.")
]
public virtual string DataNavigateUrlFormatString {
get {
object o = ViewState["DataNavigateUrlFormatString"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
ViewState["DataNavigateUrlFormatString"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the field in the DataSource that will be used as the source of
/// data for the <see cref='System.Web.UI.WebControls.HyperLinkColumn.Text'/> property.</para>
/// </devdoc>
[
WebCategory("Data"),
DefaultValue(""),
WebSysDescription(SR.HyperLinkColumn_DataTextField)
]
public virtual string DataTextField {
get {
object o = ViewState["DataTextField"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
ViewState["DataTextField"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the formatting applied to the <see cref='System.Web.UI.WebControls.HyperLinkColumn.Text'/>
/// property.</para>
/// </devdoc>
[
WebCategory("Data"),
DefaultValue(""),
DescriptionAttribute("The formatting applied to the value bound to the Text property.")
]
public virtual string DataTextFormatString {
get {
object o = ViewState["DataTextFormatString"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
ViewState["DataTextFormatString"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the URL to navigate to when the hyperlink is clicked.</para>
/// </devdoc>
[
WebCategory("Behavior"),
DefaultValue(""),
UrlProperty(),
WebSysDescription(SR.HyperLinkColumn_NavigateUrl)
]
public virtual string NavigateUrl {
get {
object o = ViewState["NavigateUrl"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
ViewState["NavigateUrl"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the window or target frame that is
/// used to display the contents resulting from the hyperlink.</para>
/// </devdoc>
[
WebCategory("Behavior"),
DefaultValue(""),
TypeConverter(typeof(TargetConverter)),
WebSysDescription(SR.HyperLink_Target)
]
public virtual string Target {
get {
object o = ViewState["Target"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
ViewState["Target"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// <para>Gets or sets the text to display for the hyperlink.</para>
/// </devdoc>
[
Localizable(true),
WebCategory("Appearance"),
DefaultValue(""),
WebSysDescription(SR.HyperLinkColumn_Text)
]
public virtual string Text {
get {
object o = ViewState["Text"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
ViewState["Text"] = value;
OnColumnChanged();
}
}
/// <devdoc>
/// </devdoc>
protected virtual string FormatDataNavigateUrlValue(object dataUrlValue) {
string formattedUrlValue = String.Empty;
if (!DataBinder.IsNull(dataUrlValue)) {
string formatting = DataNavigateUrlFormatString;
if (formatting.Length == 0) {
formattedUrlValue = dataUrlValue.ToString();
}
else {
formattedUrlValue = String.Format(CultureInfo.CurrentCulture, formatting, dataUrlValue);
}
}
return formattedUrlValue;
}
/// <devdoc>
/// </devdoc>
protected virtual string FormatDataTextValue(object dataTextValue) {
string formattedTextValue = String.Empty;
if (!DataBinder.IsNull(dataTextValue)) {
string formatting = DataTextFormatString;
if (formatting.Length == 0) {
formattedTextValue = dataTextValue.ToString();
}
else {
formattedTextValue = String.Format(CultureInfo.CurrentCulture, formatting, dataTextValue);
}
}
return formattedTextValue;
}
/// <devdoc>
/// </devdoc>
public override void Initialize() {
base.Initialize();
textFieldDesc = null;
urlFieldDesc = null;
}
/// <devdoc>
/// <para>
/// Initializes the cell representing this column with the
/// contained hyperlink.</para>
/// </devdoc>
public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) {
base.InitializeCell(cell, columnIndex, itemType);
if ((itemType != ListItemType.Header) &&
(itemType != ListItemType.Footer)) {
HyperLink hyperLink = new HyperLink();
hyperLink.Text = Text;
hyperLink.NavigateUrl = NavigateUrl;
hyperLink.Target = Target;
if ((DataNavigateUrlField.Length != 0) ||
(DataTextField.Length != 0)) {
hyperLink.DataBinding += new EventHandler(this.OnDataBindColumn);
}
cell.Controls.Add(hyperLink);
}
}
/// <devdoc>
/// </devdoc>
private void OnDataBindColumn(object sender, EventArgs e) {
Debug.Assert((DataTextField.Length != 0) || (DataNavigateUrlField.Length != 0),
"Shouldn't be DataBinding without a DataTextField and DataNavigateUrlField");
HyperLink boundControl = (HyperLink)sender;
DataGridItem item = (DataGridItem)boundControl.NamingContainer;
object dataItem = item.DataItem;
if ((textFieldDesc == null) && (urlFieldDesc == null)) {
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(dataItem);
string fieldName;
fieldName = DataTextField;
if (fieldName.Length != 0) {
textFieldDesc = props.Find(fieldName, true);
if ((textFieldDesc == null) && !DesignMode) {
throw new HttpException(SR.GetString(SR.Field_Not_Found, fieldName));
}
}
fieldName = DataNavigateUrlField;
if (fieldName.Length != 0) {
urlFieldDesc = props.Find(fieldName, true);
if ((urlFieldDesc == null) && !DesignMode) {
throw new HttpException(SR.GetString(SR.Field_Not_Found, fieldName));
}
}
}
if (textFieldDesc != null) {
object data = textFieldDesc.GetValue(dataItem);
string dataValue = FormatDataTextValue(data);
boundControl.Text = dataValue;
}
else if (DesignMode && (DataTextField.Length != 0)) {
boundControl.Text = SR.GetString(SR.Sample_Databound_Text);
}
if (urlFieldDesc != null) {
object data = urlFieldDesc.GetValue(dataItem);
string dataValue = FormatDataNavigateUrlValue(data);
boundControl.NavigateUrl = dataValue;
}
else if (DesignMode && (DataNavigateUrlField.Length != 0)) {
boundControl.NavigateUrl = "url";
}
}
}
}
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