ImageField.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » UI » WebControls » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Web 
System.Web » System » Web » UI » WebControls » ImageField.cs
//
// 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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