//
// System.Web.UI.WebControls.ImageField.cs
//
// Authors:
// Lluis Sanchez Gual (lluis@novell.com)
//
// (C) 2005 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.
//
#if NET_2_0
using System.Collections;
using System.Collections.Specialized;
using System.Web.UI;
using System.ComponentModel;
using System.Security.Permissions;
using System.Reflection;
namespace System.Web.UI.WebControls{
[AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class ImageField : DataControlField
{
public static readonly string ThisExpression = "!";
PropertyDescriptor imageProperty;
PropertyDescriptor textProperty;
public override bool Initialize (bool sortingEnabled, Control control)
{
return base.Initialize (sortingEnabled, control);
}
[DefaultValueAttribute ("")]
[LocalizableAttribute (true)]
[WebSysDescription ("")]
[WebCategoryAttribute ("Appearance")]
public virtual string AlternateText {
get {
object ob = ViewState ["AlternateText"];
if (ob != null) return (string) ob;
return string.Empty;
}
set {
ViewState ["AlternateText"] = value;
OnFieldChanged ();
}
}
[DefaultValueAttribute (true)]
[WebSysDescription ("")]
[WebCategoryAttribute ("Behavior")]
public virtual bool ConvertEmptyStringToNull {
get {
object ob = ViewState ["ConvertEmptyStringToNull"];
if (ob != null) return (bool) ob;
return true;
}
set {
ViewState ["ConvertEmptyStringToNull"] = value;
OnFieldChanged ();
}
}
[TypeConverterAttribute ("System.Web.UI.Design.DataSourceViewSchemaConverter, " + Consts.AssemblySystem_Design)]
[DefaultValueAttribute ("")]
[WebSysDescription ("")]
[WebCategoryAttribute ("Data")]
public virtual string DataAlternateTextField {
get {
object ob = ViewState ["DataAlternateTextField"];
if (ob != null) return (string) ob;
return "";
}
set {
ViewState ["DataAlternateTextField"] = value;
OnFieldChanged ();
}
}
[DefaultValueAttribute ("")]
[WebSysDescription ("")]
[WebCategoryAttribute ("Data")]
public virtual string DataAlternateTextFormatString {
get {
object ob = ViewState ["DataAlternateTextFormatString"];
if (ob != null) return (string) ob;
return "";
}
set {
ViewState ["DataAlternateTextFormatString"] = value;
OnFieldChanged ();
}
}
[TypeConverterAttribute ("System.Web.UI.Design.DataSourceViewSchemaConverter, " + Consts.AssemblySystem_Design)]
[DefaultValueAttribute ("")]
[WebSysDescription ("")]
[WebCategoryAttribute ("Data")]
public virtual string DataImageUrlField {
get {
object ob = ViewState ["DataImageUrlField"];
if (ob != null) return (string) ob;
return "";
}
set {
ViewState ["DataImageUrlField"] = value;
OnFieldChanged ();
}
}
[DefaultValueAttribute ("")]
[WebSysDescription ("")]
[WebCategoryAttribute ("Data")]
public virtual string DataImageUrlFormatString {
get {
object ob = ViewState ["DataImageUrlFormatString"];
if (ob != null) return (string) ob;
return "";
}
set {
ViewState ["DataImageUrlFormatString"] = value;
OnFieldChanged ();
}
}
[DefaultValueAttribute ("")]
[LocalizableAttribute (true)]
[WebSysDescription ("")]
[WebCategoryAttribute ("Behavior")]
public virtual string NullDisplayText {
get {
object ob = ViewState ["NullDisplayText"];
if (ob != null) return (string) ob;
return "";
}
set {
ViewState ["NullDisplayText"] = value;
OnFieldChanged ();
}
}
[DefaultValueAttribute ("")]
[EditorAttribute ("System.Web.UI.Design.ImageUrlEditor, " + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
[UrlPropertyAttribute]
[WebSysDescription ("")]
[WebCategoryAttribute ("Behavior")]
public virtual string NullImageUrl {
get {
object ob = ViewState ["NullImageUrl"];
if (ob != null) return (string) ob;
return "";
}
set {
ViewState ["NullImageUrl"] = value;
OnFieldChanged ();
}
}
[DefaultValueAttribute (false)]
[WebSysDescription ("")]
[WebCategoryAttribute ("Behavior")]
public virtual bool ReadOnly {
get {
object val = ViewState ["ReadOnly"];
return val != null ? (bool) val : false;
}
set {
ViewState ["ReadOnly"] = value;
OnFieldChanged ();
}
}
public override void ExtractValuesFromCell (IOrderedDictionary dictionary,
DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly)
{
if ((ReadOnly && !includeReadOnly) || cell.Controls.Count == 0) return;
bool editable = (rowState & (DataControlRowState.Edit | DataControlRowState.Insert)) != 0;
if (includeReadOnly || editable) {
Control control = cell.Controls [0];
//TODO: other controls?
if (control is Image)
dictionary [DataImageUrlField] = ((Image)control).ImageUrl;
else
if (control is TextBox)
dictionary [DataImageUrlField] = ((TextBox) control).Text;
}
}
public override void InitializeCell (DataControlFieldCell cell,
DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
{
base.InitializeCell (cell, cellType, rowState, rowIndex);
if (cellType == DataControlCellType.DataCell) {
InitializeDataCell (cell, rowState);
if ((rowState & DataControlRowState.Insert) == 0)
cell.DataBinding += new EventHandler (OnDataBindField);
}
}
protected virtual void InitializeDataCell (DataControlFieldCell cell, DataControlRowState rowState)
{
bool editable = (rowState & (DataControlRowState.Edit | DataControlRowState.Insert)) != 0;
if (editable && !ReadOnly) {
TextBox box = new TextBox ();
cell.Controls.Add (box);
}
else if (DataImageUrlField.Length > 0) {
Image img = new Image ();
img.ControlStyle.CopyFrom (ControlStyle);
cell.Controls.Add (img);
}
}
protected virtual string FormatImageUrlValue (object value)
{
if (value == null)
return null;
else if (DataImageUrlFormatString.Length > 0)
return string.Format (DataImageUrlFormatString, value);
else
return value.ToString ();
}
protected virtual string GetFormattedAlternateText (Control controlContainer)
{
if (DataAlternateTextField.Length > 0)
{
if (textProperty == null)
textProperty = GetProperty (controlContainer, DataAlternateTextField);
object value = GetValue (controlContainer, DataAlternateTextField, ref textProperty);
if (value == null || (value.ToString().Length == 0 && ConvertEmptyStringToNull))
return NullDisplayText;
else if (DataAlternateTextFormatString.Length > 0)
return string.Format (DataAlternateTextFormatString, value);
else
return value.ToString ();
}
else
return AlternateText;
}
protected virtual object GetValue (Control controlContainer, string fieldName, ref PropertyDescriptor cachedDescriptor)
{
if (DesignMode)
return GetDesignTimeValue ();
else {
object dataItem = DataBinder.GetDataItem (controlContainer);
if (dataItem == null)
throw new HttpException ("A data item was not found in the container. The container must either implement IDataItemContainer, or have a property named DataItem.");
if (fieldName == ThisExpression)
return dataItem;
else {
if (cachedDescriptor != null) return cachedDescriptor.GetValue (dataItem);
PropertyDescriptor prop = GetProperty (controlContainer, fieldName);
return prop.GetValue (dataItem);
}
}
}
PropertyDescriptor GetProperty (Control controlContainer, string fieldName)
{
if (fieldName == ThisExpression)
return null;
IDataItemContainer dic = (IDataItemContainer) controlContainer;
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties (dic.DataItem);
PropertyDescriptor prop = properties != null ? properties [fieldName] : null;
if (prop == null)
throw new InvalidOperationException ("Property '" + fieldName + "' not found in object of type " + dic.DataItem.GetType());
return prop;
}
protected virtual string GetDesignTimeValue ()
{
return "Databound";
}
protected virtual void OnDataBindField (object sender, EventArgs e)
{
Control control = (Control) sender;
ControlCollection controls = control != null ? control.Controls : null;
Control namingContainer = control.NamingContainer;
Control c;
if (sender is DataControlFieldCell) {
if (controls.Count == 0)
return;
c = controls [0];
} else if (sender is Image || sender is TextBox)
c = control;
else
return;
if (imageProperty == null)
imageProperty = GetProperty (namingContainer, DataImageUrlField);
if (c is TextBox) {
object val = GetValue (namingContainer, DataImageUrlField, ref imageProperty);
((TextBox)c).Text = val != null ? val.ToString() : String.Empty;
}
else if (c is Image) {
Image img = (Image)c;
string value = FormatImageUrlValue (GetValue (namingContainer, DataImageUrlField, ref imageProperty));
if (value == null || (ConvertEmptyStringToNull && value.Length == 0)) {
if (NullImageUrl == null || NullImageUrl.Length == 0) {
c.Visible = false;
Label label = new Label ();
label.Text = NullDisplayText;
controls.Add (label);
}
else
value = NullImageUrl;
}
img.ImageUrl = value;
img.AlternateText = GetFormattedAlternateText (namingContainer);
}
}
public override void ValidateSupportsCallback ()
{
}
protected override DataControlField CreateField ()
{
return new ImageField ();
}
protected override void CopyProperties (DataControlField newField)
{
base.CopyProperties (newField);
ImageField field = (ImageField) newField;
field.AlternateText = AlternateText;
field.ConvertEmptyStringToNull = ConvertEmptyStringToNull;
field.DataAlternateTextField = DataAlternateTextField;
field.DataAlternateTextFormatString = DataAlternateTextFormatString;
field.DataImageUrlField = DataImageUrlField;
field.DataImageUrlFormatString = DataImageUrlFormatString;
field.NullDisplayText = NullDisplayText;
field.NullImageUrl = NullImageUrl;
field.ReadOnly = ReadOnly;
}
}
}
#endif
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