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//
// System.Web.UI.WebControls.HyperLinkColumn.cs
//
// Authors:
// Gaurav Vaish (gvaish@iitk.ac.in)
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//
// (c) 2002 Ximian, Inc. (http://www.ximian.com)
// (C) Gaurav Vaish (2002)
// (C) 2003 Andreas Nahr
//
using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
public class HyperLinkColumn: DataGridColumn
{
PropertyDescriptor textFieldDescriptor;
PropertyDescriptor urlFieldDescriptor;
public HyperLinkColumn ()
{
}
[DefaultValue (""), WebCategory ("Misc")]
[WebSysDescription ("The field that gets data-bound to the NavigateUrl.")]
public virtual string DataNavigateUrlField {
get {
object o = ViewState ["DataNavigateUrlField"];
if (o != null)
return (string) o;
return String.Empty;
}
set {
ViewState ["DataNavigateUrlField"] = value;
OnColumnChanged ();
}
}
// LAMESPEC should use WebSysDescription as all others do, but MS uses Description here
[DefaultValue (""), WebCategory ("Misc")]
[Description ("The formatting rule for the text content that gets data-bound to the NavigateUrl.")]
public virtual string DataNavigateUrlFormatString {
get {
object o = ViewState ["DataNavigateUrlFormatString"];
if (o != null)
return (string) o;
return String.Empty;
}
set {
ViewState ["DataNavigateUrlFormatString"] = value;
OnColumnChanged ();
}
}
[DefaultValue (""), WebCategory ("Misc")]
[WebSysDescription ("The field that gets data-bound to the Text property.")]
public virtual string DataTextField {
get {
object o = ViewState ["DataTextField"];
if (o != null)
return (string) o;
return String.Empty;
}
set {
ViewState ["DataTextField"] = value;
OnColumnChanged ();
}
}
// LAMESPEC should use WebSysDescription as all others do, but MS uses Description here
[DefaultValue (""), WebCategory ("Misc")]
[Description ("The formatting rule for the text content that gets data-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 ();
}
}
[DefaultValue (""), WebCategory ("Misc")]
[WebSysDescription ("The URL that this hyperlink links to.")]
public virtual string NavigateUrl {
get {
object o = ViewState ["NavigateUrl"];
if (o != null)
return (string) o;
return String.Empty;
}
set {
ViewState ["NavigateUrl"] = value;
OnColumnChanged ();
}
}
[DefaultValue (""), WebCategory ("Misc")]
[WebSysDescription ("The target frame in which the NavigateUrl property should be opened.")]
public virtual string Target {
get {
object o = ViewState ["Target"];
if (o != null)
return (string) o;
return String.Empty;
}
set {
ViewState ["Target"] = value;
OnColumnChanged ();
}
}
[DefaultValue (""), WebCategory ("Misc")]
[WebSysDescription ("The Text for the hyperlink.")]
public virtual string Text {
get {
object o = ViewState ["Text"];
if (o != null)
return (string) o;
return String.Empty;
}
set {
ViewState ["Text"] = value;
OnColumnChanged ();
}
}
public override void Initialize ()
{
textFieldDescriptor = null;
urlFieldDescriptor = null;
base.Initialize ();
}
public override void InitializeCell (TableCell cell, int columnIndex, ListItemType itemType)
{
base.InitializeCell (cell, columnIndex, itemType);
if (itemType != ListItemType.Header && itemType != ListItemType.Footer) {
HyperLink toDisplay = new HyperLink ();
toDisplay.Text = Text;
toDisplay.NavigateUrl = NavigateUrl;
toDisplay.Target = Target;
if (DataTextField.Length > 0 || DataNavigateUrlField.Length > 0)
toDisplay.DataBinding += new EventHandler (OnDataBindHyperLinkColumn);
cell.Controls.Add (toDisplay);
}
}
private void OnDataBindHyperLinkColumn (object sender, EventArgs e)
{
HyperLink link = (HyperLink) sender;
object item = ((DataGridItem) link.NamingContainer).DataItem;
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties (item);
if (textFieldDescriptor == null)
textFieldDescriptor = properties.Find (DataTextField, true);
if (urlFieldDescriptor == null)
urlFieldDescriptor = properties.Find (DataNavigateUrlField, true);
if (DataTextField.Length > 0 && textFieldDescriptor == null && !DesignMode)
throw new HttpException (HttpRuntime.FormatResourceString (
"Field_Not_Found", DataTextField));
if (DataNavigateUrlField.Length > 0 && urlFieldDescriptor == null && !DesignMode)
throw new HttpException (HttpRuntime.FormatResourceString (
"Field_Not_Found", DataNavigateUrlField));
if (textFieldDescriptor != null) {
link.Text = FormatDataTextValue (textFieldDescriptor.GetValue (item));
} else {
link.Text = Text;
}
if (urlFieldDescriptor != null) {
link.NavigateUrl = FormatDataNavigateUrlValue (urlFieldDescriptor.GetValue (item));
return;
}
if (DataNavigateUrlField.Length != 0 && DesignMode)
link.NavigateUrl = "url";
}
protected virtual string FormatDataNavigateUrlValue (object dataUrlValue)
{
if (dataUrlValue == null)
return String.Empty;
string retVal;
if (DataNavigateUrlFormatString.Length > 0) {
retVal = String.Format (DataNavigateUrlFormatString, dataUrlValue);
} else {
retVal = dataUrlValue.ToString ();
}
return retVal;
}
protected virtual string FormatDataTextValue (object dataTextValue)
{
if (dataTextValue == null)
return String.Empty;
string retVal;
if (DataTextFormatString.Length > 0) {
retVal = String.Format (DataTextFormatString, dataTextValue);
} else {
retVal = dataTextValue.ToString ();
}
return retVal;
}
}
}
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