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

//
// 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.
//
//
// System.Web.UI.HtmlControls.HtmlInputImage.cs
//
// Authors:
//  Jackson Harper (jackson@ximian.com)
//
// (C) 2005-2010 Novell, Inc.


//
// TODO: getting the .x and .y in LoadData doesn't work with mozilla
//

using System.Globalization;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Security.Permissions;
using System.Web.Util;

namespace System.Web.UI.HtmlControls{
  // CAS
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  // attributes
  [DefaultEvent("ServerClick")]
  [SupportsEventValidation]
  public class HtmlInputImage : HtmlInputControl, IPostBackDataHandler, IPostBackEventHandler 
  {
    static readonly object ServerClickEvent = new object ();

    int clicked_x;
    int clicked_y;

    public HtmlInputImage () : base ("image")
    {
    }

    [DefaultValue(true)]
    [WebSysDescription("")]
    [WebCategory("Behavior")]
    public virtual bool CausesValidation {
      get {
        return ViewState.GetBool ("CausesValidation", true);
      }
      set {
        ViewState ["CausesValidation"] = value;
      }
    }

    [DefaultValue("")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    [WebSysDescription("")]
    [WebCategory("Appearance")]
    public string Align {
      get { return GetAtt ("align"); }
      set { SetAtt ("align", value); }
    }

    [DefaultValue("")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    [Localizable (true)]
    [WebSysDescription("")]
    [WebCategory("Appearance")]
    public string Alt {
      get { return GetAtt ("alt"); }
      set { SetAtt ("alt", value); }
    }

    [DefaultValue("")]
    [WebSysDescription("")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    [WebCategory("Appearance")]
    [UrlProperty]
    public string Src {
      get { return GetAtt ("src"); }
      set { SetAtt ("src", value); }
    }

    [DefaultValue("-1")]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    [WebSysDescription("")]
    [WebCategory("Appearance")]
    public int Border {
      get {
        string border = Attributes ["border"];
        if (border == null)
          return -1;
        return Int32.Parse (border, Helpers.InvariantCulture);
      }
      set {
        if (value == -1) {
          Attributes.Remove ("border");
          return;
        }
        Attributes ["border"] = value.ToString (Helpers.InvariantCulture);
      }
    }

    bool LoadPostDataInternal (string postDataKey, NameValueCollection postCollection)
    {
      string x = postCollection [UniqueID + ".x"];
      string y = postCollection [UniqueID + ".y"];

      if (x != null && x.Length != 0 &&
          y != null && y.Length != 0) {
        clicked_x = Int32.Parse (x, Helpers.InvariantCulture);
        clicked_y = Int32.Parse (y, Helpers.InvariantCulture);
        Page.RegisterRequiresRaiseEvent (this);
        return true;
      }

      return false;
    }

    
    void RaisePostBackEventInternal (string eventArgument)
    {
      if (CausesValidation)
        Page.Validate (ValidationGroup);

      OnServerClick (new ImageClickEventArgs (clicked_x, clicked_y));
    }

    void RaisePostDataChangedEventInternal ()
    {
      /* no events to raise */
    }

    [DefaultValue ("")]
    public virtual string ValidationGroup
    {
      get {
        return ViewState.GetString ("ValidationGroup", "");
      }
      set {
        ViewState ["ValidationGroup"] = value;
      }
    }

    protected virtual bool LoadPostData (string postDataKey, NameValueCollection postCollection)
    {
      return LoadPostDataInternal (postDataKey, postCollection);
    }

    protected virtual void RaisePostBackEvent (string eventArgument)
    {
      RaisePostBackEventInternal (eventArgument);
    }

    protected virtual void RaisePostDataChangedEvent ()
    {
      ValidateEvent (UniqueID, String.Empty);
      RaisePostDataChangedEventInternal ();
    }

    bool IPostBackDataHandler.LoadPostData (string postDataKey, NameValueCollection postCollection)
    {
      return LoadPostData (postDataKey, postCollection);
    }
    
    void IPostBackDataHandler.RaisePostDataChangedEvent ()
    {
      RaisePostDataChangedEvent();
    }
        
    void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)
    {
      RaisePostBackEvent (eventArgument);
    }

    protected internal override void OnPreRender (EventArgs e)
    {
      base.OnPreRender (e);

      Page page = Page;
      if (page != null && !Disabled) {
        page.RegisterRequiresPostBack (this);
        page.RegisterEnabledControl (this);
      }
    }

    protected virtual void OnServerClick (ImageClickEventArgs e)
    {
      ImageClickEventHandler handler = Events [ServerClickEvent] as ImageClickEventHandler;
      if (handler != null)
        handler (this, e);
    }

    protected override void RenderAttributes (HtmlTextWriter writer)
    {
      Page page = Page;
      if (page != null)
        page.ClientScript.RegisterForEventValidation (UniqueID);
      
      if (CausesValidation && page != null && page.AreValidatorsUplevel (ValidationGroup)) {
        ClientScriptManager csm = page.ClientScript;
        Attributes ["onclick"] += csm.GetClientValidationEvent (ValidationGroup);
      }

      PreProcessRelativeReference (writer,"src");
      base.RenderAttributes (writer);
    }

    void SetAtt (string name, string value)
    {
      if ((value == null) || (value.Length == 0))
        Attributes.Remove (name);
      else
        Attributes [name] = value;
    }

    string GetAtt (string name)
    {
      string res = Attributes [name];
      if (res == null)
        return String.Empty;
      return res;
    }

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