ImageButton.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 » ImageButton.cs
//
// System.Web.UI.WebControls.ImageButton.cs
//
// Authors:
//  Jordi Mas i Hernandez (jordi@ximian.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.
//

using System.Collections.Specialized;
using System.ComponentModel;
using System.Security.Permissions;

namespace System.Web.UI.WebControls{

  // CAS
  [AspNetHostingPermissionAttribute (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermissionAttribute (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  // attributes
  [DefaultEvent("Click")]
#if NET_2_0
  [Designer ("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
  [SupportsEventValidation]
  public class ImageButton : Image, IPostBackDataHandler, IPostBackEventHandler, IButtonControl {
#else
  public class ImageButton : Image, IPostBackDataHandler, IPostBackEventHandler {
#endif
    static readonly object ClickEvent = new object ();
    static readonly object CommandEvent = new object ();
    int pos_x, pos_y;

    public ImageButton ()
    {

    }

#if ONLY_1_1
    [Bindable(false)]
#endif    
    [DefaultValue(true)]
    [WebSysDescription ("")]
    [WebCategory ("Behavior")]
#if NET_2_0
    [Themeable (false)]
    public virtual
#else    
    public
#endif    
    bool CausesValidation {
      get {
        return ViewState.GetBool ("CausesValidation", true);
      }

      set {
        ViewState ["CausesValidation"] = value;
      }
    }

    [Bindable(true)]
    [DefaultValue("")]
    [WebSysDescription ("")]
    [WebCategory ("Behavior")]
#if NET_2_0
    [Themeable (false)]
#endif    
    public string CommandArgument {
      get {
        return ViewState.GetString ("CommandArgument", "");
      }
      set {
        ViewState ["CommandArgument"] = value;
      }
    }

    [DefaultValue("")]
    [WebSysDescription ("")]
    [WebCategory ("Behavior")]
#if NET_2_0
    [Themeable (false)]
#endif    
    public string CommandName {
      get {
        return ViewState.GetString ("CommandName", "");
      }
      set {
        ViewState ["CommandName"] = value;
      }
    }

#if NET_2_0
    [EditorBrowsable (EditorBrowsableState.Always)]
    [Browsable (true)]
    [DefaultValue (true)]
    [Bindable (true)]
    public virtual new bool Enabled
    {
      // Should there be any special code below? Doesn't look so...
      get { return base.Enabled; }
      set { base.Enabled = value; }
    }

    [Browsable (false)]
    [EditorBrowsable (EditorBrowsableState.Never)]
    [Themeable (false)]
    [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
    public override bool GenerateEmptyAlternateText
    {
      get { return false; }
      set { throw new NotSupportedException (); }
    }

    [DefaultValue ("")]
    [Themeable (false)]
    public virtual string OnClientClick 
    {
      get {
        return ViewState.GetString ("OnClientClick", String.Empty);
      }
      set {
        ViewState ["OnClientClick"] = value;
      }
    }

    [Themeable (false)]
#if NET_2_0
    [UrlProperty ("*.aspx")]
#else
    [UrlProperty]
#endif
    [DefaultValue ("")]
    [Editor ("System.Web.UI.Design.UrlEditor, "  + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
    public virtual string PostBackUrl {
      get {
        return ViewState.GetString ("PostBackUrl", String.Empty);
      }
      set {
        ViewState["PostBackUrl"] = value;
      }
    }

    [Themeable (false)]
    [DefaultValue ("")]
    [WebSysDescription ("")]
    [WebCategory ("Behavior")]
    public virtual string ValidationGroup
    {
      get {
        return ViewState.GetString ("ValidationGroup", "");
      }
      set {
        ViewState ["ValidationGroup"] = value;
      }
    }
#endif    

    [Browsable(false)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
#if NET_2_0 && HAVE_CONTROL_ADAPTERS
    protected virtual new
#else    
    protected override
#endif
    HtmlTextWriterTag TagKey {
      get { return HtmlTextWriterTag.Input; }
    }

#if NET_2_0
    // Gets or sets the value of the ImageButton control's AlternateText property. (MSDN)
    protected virtual string Text 
    {
      get {
        return AlternateText;
      }
      set {
        AlternateText = value;
      }
    }
#endif    

    protected override void AddAttributesToRender (HtmlTextWriter writer)
    {      
      Page page = Page;
      if (page != null)
        page.VerifyRenderingInServerForm (this);
      
      writer.AddAttribute (HtmlTextWriterAttribute.Type, "image", false);
      writer.AddAttribute (HtmlTextWriterAttribute.Name, UniqueID);

      base.AddAttributesToRender (writer);
#if NET_2_0
      string onclick = OnClientClick;
      if (!String.IsNullOrEmpty (onclick))
        onclick = ClientScriptManager.EnsureEndsWithSemicolon (onclick);
      else
        onclick = String.Empty;
      
      if (HasAttributes && Attributes ["onclick"] != null) {
        onclick = ClientScriptManager.EnsureEndsWithSemicolon (onclick + Attributes ["onclick"]);
        Attributes.Remove ("onclick");
      }
      
      if (page != null)
        onclick += GetClientScriptEventReference ();
      
      if (onclick.Length > 0)
        writer.AddAttribute (HtmlTextWriterAttribute.Onclick, onclick);
#else
      if (CausesValidation && page != null && page.AreValidatorsUplevel ()) {
        ClientScriptManager csm = new ClientScriptManager (page);
        writer.AddAttribute (HtmlTextWriterAttribute.Onclick, csm.GetClientValidationEvent ());
        writer.AddAttribute ("language", "javascript");
      }
#endif
    }

#if NET_2_0
    internal virtual string GetClientScriptEventReference ()
    {
      PostBackOptions options = GetPostBackOptions ();
      Page page = Page;
      
      if (options.PerformValidation || !String.IsNullOrEmpty (options.ActionUrl)) {
        return page != null ? page.ClientScript.GetPostBackEventReference (options, true) : String.Empty;
      } else {
        if (page != null)
          page.ClientScript.RegisterForEventValidation (options);
        return String.Empty;
      }
    }

    protected virtual PostBackOptions GetPostBackOptions ()
    {
      PostBackOptions options = new PostBackOptions (this);
      Page page = Page;
      
      options.ActionUrl = (PostBackUrl.Length > 0 ?
#if TARGET_J2EE
               CreateActionUrl (PostBackUrl)
#else
               (page != null ? page.ResolveClientUrl (PostBackUrl) : null)
#endif
               : null);

      options.Argument = String.Empty;
      options.ClientSubmit = true;
      options.RequiresJavaScriptProtocol = true;
      options.PerformValidation = CausesValidation && page != null && page.AreValidatorsUplevel (ValidationGroup);
      if (options.PerformValidation)
        options.ValidationGroup = ValidationGroup;
      else
        options.ValidationGroup = null;
      
      return options;
    }
#endif    


#if NET_2_0
    protected virtual
#endif
    bool LoadPostData (string postDataKey, NameValueCollection postCollection) 
    {
      string x, y;
      string unique = UniqueID;
      x = postCollection [unique + ".x"];
      y = postCollection [unique + ".y"];
      if (x != null && x != "" && y != null && y != "") {
        pos_x = Int32.Parse(x);
        pos_y = Int32.Parse(y);
        Page.RegisterRequiresRaiseEvent (this);
        return true;
      } else {
        x = postCollection [unique];
        if (x != null && x != "") {
          pos_x = Int32.Parse (x);
          pos_y = 0;
          Page.RegisterRequiresRaiseEvent (this);
          return true;
        }
      }

      return false;
    }
#if NET_2_0
    protected virtual
#endif
    void RaisePostDataChangedEvent ()
    {
    }
    
#if NET_2_0
    protected virtual
#endif
    void RaisePostBackEvent (string eventArgument)
    {
#if NET_2_0
      ValidateEvent (UniqueID, String.Empty);
#endif
      if (CausesValidation)
#if NET_2_0
        Page.Validate (ValidationGroup);
#else
        Page.Validate ();
#endif

      OnClick (new ImageClickEventArgs (pos_x, pos_y));
      OnCommand (new CommandEventArgs (CommandName, CommandArgument));
    }

    bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
    {
      return LoadPostData (postDataKey, postCollection);
    }


    void IPostBackDataHandler.RaisePostDataChangedEvent ()
    {
      RaisePostDataChangedEvent ();
    }

    void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)
    {
      RaisePostBackEvent (eventArgument);
    }

    protected virtual void OnClick (ImageClickEventArgs e)
    {
      if (Events != null) {
        ImageClickEventHandler eh = (ImageClickEventHandler) (Events [ClickEvent]);
        if (eh != null)
          eh (this, e);
      }
    }

    protected virtual void OnCommand (CommandEventArgs e)
    {
      if (Events != null) {
        CommandEventHandler eh = (CommandEventHandler) (Events [CommandEvent]);
        if (eh != null)
          eh (this, e);
      }

      RaiseBubbleEvent (this, e);
    }

#if NET_2_0
    protected internal
#else    
    protected
#endif    
    override void OnPreRender (EventArgs e)
    {
      if (Page != null && Enabled)
        Page.RegisterRequiresPostBack (this);
    }

    [WebSysDescription ("")]
    [WebCategory ("Action")]
    public event ImageClickEventHandler Click
    {
      add {
        Events.AddHandler (ClickEvent, value);
      }
      remove {
        Events.RemoveHandler (ClickEvent, value);
      }
    }

    [WebSysDescription ("")]
    [WebCategory ("Action")]
    public event CommandEventHandler Command
    {
      add {
        Events.AddHandler (CommandEvent, value);
      }
      remove {
        Events.RemoveHandler (CommandEvent, value);
      }
    }

#if NET_2_0
    string IButtonControl.Text 
    {
      get {
        return Text;
      }
      set {
        Text = value;
      }
    }

    event EventHandler IButtonControl.Click
    {
      add {
        Events.AddHandler (ClickEvent, value);
      }
      remove {
        Events.RemoveHandler (ClickEvent, value);
      }
    }
    
#endif
  }
}


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