ImageButton.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / ImageButton.cs / 1305376 / ImageButton.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 

namespace System.Web.UI.WebControls { 

    using System;
    using System.Collections;
    using System.Collections.Specialized; 
    using System.ComponentModel;
    using System.Drawing.Design; 
    using System.Globalization; 
    using System.Web;
    using System.Web.UI; 
    using System.Web.Util;


    ///  
    ///    Creates a control that displays an image, responds to mouse clicks,
    ///       and records the mouse pointer position. 
    ///  
    [
    DefaultEvent("Click"), 
    Designer("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + AssemblyRef.SystemDesign),
    SupportsEventValidation,
    ]
    public class ImageButton : Image, IPostBackDataHandler, IPostBackEventHandler, IButtonControl { 

        private static readonly object EventClick = new object(); 
        private static readonly object EventButtonClick = new object(); 
        private static readonly object EventCommand = new object();
 
        private int x = 0;
        private int y = 0;

 
        /// 
        /// Initializes a new instance of the  class. 
        ///  
        public ImageButton() {
        } 


        /// 
        /// Gets or sets the command associated with the  that is propogated in the  event along with the  
        /// property.
        ///  
        [ 
        DefaultValue(""),
        WebCategory("Behavior"), 
        WebSysDescription(SR.WebControl_CommandName),
        Themeable(false),
        ]
        public string CommandName { 
            get {
                string s = (string)ViewState["CommandName"]; 
                return((s == null) ? String.Empty : s); 
            }
            set { 
                ViewState["CommandName"] = value;
            }
        }
 

        ///  
        ///    Gets or sets an optional argument that is propogated in 
        ///       the  event with the associated
        ///     
        ///    property.
        /// 
        [
        Bindable(true), 
        DefaultValue(""),
        Themeable(false), 
        WebCategory("Behavior"), 
        WebSysDescription(SR.WebControl_CommandArgument),
        ] 
        public string CommandArgument {
            get {
                string s = (string)ViewState["CommandArgument"];
                return((s == null) ? String.Empty : s); 
            }
            set { 
                ViewState["CommandArgument"] = value; 
            }
        } 


        /// 
        ///    Gets or sets whether pressing the button causes page validation to fire. This defaults to True so that when 
        ///          using validation controls, the validation state of all controls are updated when the button is clicked, both
        ///          on the client and the server. Setting this to False is useful when defining a cancel or reset button on a page 
        ///          that has validators. 
        /// 
        [ 
        Themeable(false),
        DefaultValue(true),
        WebCategory("Behavior"),
        WebSysDescription(SR.Button_CausesValidation) 
        ]
        public virtual bool CausesValidation { 
            get { 
                object b = ViewState["CausesValidation"];
                return((b == null) ? true : (bool)b); 
            }
            set {
                ViewState["CausesValidation"] = value;
            } 
        }
 
 
        [
        Browsable(true), 
        EditorBrowsableAttribute(EditorBrowsableState.Always),
        Bindable(true),
        WebCategory("Behavior"),
        DefaultValue(true), 
        WebSysDescription(SR.WebControl_Enabled)
        ] 
        public override bool Enabled { 
            get {
                return base.Enabled; 
            }
            set {
                base.Enabled = value;
            } 
        }
 
        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        EditorBrowsable(EditorBrowsableState.Never),
        Themeable(false),
        ]
        public override bool GenerateEmptyAlternateText { 
            get {
                return base.GenerateEmptyAlternateText; 
            } 
            set {
                throw new NotSupportedException(SR.GetString( 
                    SR.Property_Set_Not_Supported, "GenerateEmptyAlternateText", this.GetType().ToString()));
            }
        }
 

        ///  
        ///    The script that is executed on a client-side click. 
        /// 
        [ 
        DefaultValue(""),
        WebCategory("Behavior"),
        WebSysDescription(SR.Button_OnClientClick),
        Themeable(false), 
        ]
        public virtual string OnClientClick { 
            get { 
                string s = (string)ViewState["OnClientClick"];
                if (s == null) { 
                    return String.Empty;
                }
                return s;
            } 
            set {
                ViewState["OnClientClick"] = value; 
            } 
        }
 

        [
        DefaultValue(""),
        Editor("System.Web.UI.Design.UrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), 
        Themeable(false),
        UrlProperty("*.aspx"), 
        WebCategory("Behavior"), 
        WebSysDescription(SR.Button_PostBackUrl),
        ] 
        public virtual string PostBackUrl {
            get {
                string s = (string)ViewState["PostBackUrl"];
                return s == null? String.Empty : s; 
            }
            set { 
                ViewState["PostBackUrl"] = value; 
            }
        } 

        public override bool SupportsDisabledAttribute {
            get {
                return true; 
            }
        } 
 
        /// 
        ///     Gets a value that represents the tag HtmlTextWriterTag.Input. This property is read-only. 
        /// 
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        protected override HtmlTextWriterTag TagKey { 
            get { 
                return HtmlTextWriterTag.Input;
            } 
        }


        [ 
        WebCategory("Behavior"),
        Themeable(false), 
        DefaultValue(""), 
        WebSysDescription(SR.PostBackControl_ValidationGroup)
        ] 
        public virtual string ValidationGroup {
            get {
                string s = (string)ViewState["ValidationGroup"];
                return((s == null) ? String.Empty : s); 
            }
            set { 
                ViewState["ValidationGroup"] = value; 
            }
        } 


        /// 
        /// Represents the method that will handle the  event of an . 
        /// 
        [ 
        WebCategory("Action"), 
        WebSysDescription(SR.ImageButton_OnClick)
        ] 
        public event ImageClickEventHandler Click {
            add {
                Events.AddHandler(EventClick, value);
            } 
            remove {
                Events.RemoveHandler(EventClick, value); 
            } 
        }
 

        /// 
        /// Represents the method that will handle the  event of an .
        ///  
        event EventHandler IButtonControl.Click {
            add { 
                Events.AddHandler(EventButtonClick, value); 
            }
            remove { 
                Events.RemoveHandler(EventButtonClick, value);
            }
        }
 

        ///  
        /// Represents the method that will handle the  event of an . 
        /// 
        [ 
        WebCategory("Action"),
        WebSysDescription(SR.ImageButton_OnCommand)
        ]
        public event CommandEventHandler Command { 
            add {
                Events.AddHandler(EventCommand, value); 
            } 
            remove {
                Events.RemoveHandler(EventCommand, value); 
            }
        }

 
        /// 
        ///  
        /// Adds the attributes of an  to the output 
        ///    stream for rendering on the client.
        ///  
        protected override void AddAttributesToRender(HtmlTextWriter writer) {
            Page page = Page;

            // Make sure we are in a form tag with runat=server. 
            if (page != null) {
                page.VerifyRenderingInServerForm(this); 
            } 

            writer.AddAttribute(HtmlTextWriterAttribute.Type,"image"); 

            string uniqueID = UniqueID;
            PostBackOptions options = GetPostBackOptions();
 
            // Don't render Name on a button if __doPostBack is posting back to a different control
            // because Page will register this control as requiring post back notification even though 
            // it's not the target of the postback.  If the TargetControl isn't this control, this control's 
            // RaisePostBackEvent should never get called.  See VSWhidbey 477095.
            if (uniqueID != null && (options == null || options.TargetControl == this)) { 
                writer.AddAttribute(HtmlTextWriterAttribute.Name, uniqueID);
            }

            // 

            bool effectiveEnabled = IsEnabled; 
 

            string onClick = String.Empty; 

            if (effectiveEnabled) {
                // Need to merge the onclick attribute with the OnClientClick
                onClick = Util.EnsureEndWithSemiColon(OnClientClick); 
                if (HasAttributes) {
                    string userOnClick = Attributes["onclick"]; 
                    if (userOnClick != null) { 
                        onClick += Util.EnsureEndWithSemiColon(userOnClick);
                        Attributes.Remove("onclick"); 
                    }
                }
            }
 
            if (Enabled && !effectiveEnabled && SupportsDisabledAttribute) {
                // We need to do the cascade effect on the server, because the browser 
                // only renders as disabled, but doesn't disable the functionality. 
                writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
            } 

            base.AddAttributesToRender(writer);

            if (page != null && options != null) { 
                page.ClientScript.RegisterForEventValidation(options);
 
                if (effectiveEnabled) { 
                    string postBackEventReference = page.ClientScript.GetPostBackEventReference(options, false);
                    if (!String.IsNullOrEmpty(postBackEventReference)) { 
                        onClick = Util.MergeScript(onClick, postBackEventReference);
                        if (options.ClientSubmit) {
                            // Dev10 Bugs 584471
                            // a derived control may return PostBackOptions with ClientSubmit=true, 
                            // such as DataControlImageButton. Without a return false, there would be
                            // a double submit. 
                            onClick = Util.EnsureEndWithSemiColon(onClick) + "return false;"; 
                        }
                    } 
                }
            }

            if (onClick.Length > 0) { 
                writer.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
 
                if (EnableLegacyRendering) { 
                    writer.AddAttribute("language", "javascript", false);
                } 
            }
        }

        // Returns the client post back options. 
        protected virtual PostBackOptions GetPostBackOptions() {
            PostBackOptions options = new PostBackOptions(this, String.Empty); 
            // The postback script ends up in onclick, not href, 
            // so we shouldn't force the javascript protocol like we do in LinkButton.
            options.ClientSubmit = false; 

            if (!String.IsNullOrEmpty(PostBackUrl)) {
                options.ActionUrl = HttpUtility.UrlPathEncode(ResolveClientUrl(PostBackUrl));
            } 

            if (CausesValidation && Page != null && Page.GetValidators(ValidationGroup).Count > 0) { 
                options.PerformValidation = true; 
                options.ValidationGroup = ValidationGroup;
            } 

            return options;
        }
 

        ///  
        ///  
        /// Processes posted data for the  control.
        ///  
        bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) {
            return LoadPostData(postDataKey, postCollection);
        }
 

        ///  
        ///  
        /// Processes posted data for the  control.
        ///  
        protected virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) {
            string name = UniqueID;
            string postX = postCollection[name + ".x"];
            string postY = postCollection[name + ".y"]; 
            if (postX != null && postY != null && postX.Length > 0 && postY.Length > 0) {
                x = Int32.Parse(postX, CultureInfo.InvariantCulture); 
                y = Int32.Parse(postY, CultureInfo.InvariantCulture); 
                if (Page != null) {
                    Page.RegisterRequiresRaiseEvent(this); 
                }
            }
            return false;
        } 

 
        ///  
        /// Raises the  event.
        ///  
        protected virtual void OnClick(ImageClickEventArgs e) {
            ImageClickEventHandler onClickHandler = (ImageClickEventHandler)Events[EventClick];
            if (onClickHandler != null) onClickHandler(this,e);
 
            EventHandler onButtonClickHandler = (EventHandler)Events[EventButtonClick];
            if (onButtonClickHandler != null) onButtonClickHandler(this,(EventArgs)e); 
        } 

 
        /// 
        /// Raises the  event.
        /// 
        protected virtual void OnCommand(CommandEventArgs e) { 
            CommandEventHandler onCommandHandler = (CommandEventHandler)Events[EventCommand];
            if (onCommandHandler != null) 
                onCommandHandler(this,e); 

            // Command events are bubbled up the control heirarchy 
            RaiseBubbleEvent(this, e);
        }

 
        /// 
        ///  
        ///     
        ///       Determine
        ///       if the image has been clicked prior to rendering on the client.  
        /// 
        protected internal override void OnPreRender(EventArgs e) {
            base.OnPreRender(e);
            if (Page != null) { 
                Page.RegisterRequiresPostBack(this);
 
                if (IsEnabled && 
                    ((CausesValidation && Page.GetValidators(ValidationGroup).Count > 0) ||
                     !String.IsNullOrEmpty(PostBackUrl))) { 
                    Page.RegisterWebFormsScript();  // VSWhidbey 489577
                }
            }
        } 

 
        ///  
        /// 
        /// Raises events on post back for the  
        /// control.
        /// 
        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) {
            RaisePostBackEvent(eventArgument); 
        }
 
 
        /// 
        ///  
        /// Raises events on post back for the 
        /// control.
        /// 
        protected virtual void RaisePostBackEvent(string eventArgument) { 
            ValidateEvent(this.UniqueID, eventArgument);
 
            if (CausesValidation) { 
                Page.Validate(ValidationGroup);
            } 
            OnClick(new ImageClickEventArgs(x,y));
            OnCommand(new CommandEventArgs(CommandName, CommandArgument));

        } 

 
        ///  
        /// 
        /// Raised when posted data for a control has changed. 
        /// 
        void IPostBackDataHandler.RaisePostDataChangedEvent() {
            RaisePostDataChangedEvent();
        } 

 
        ///  
        /// 
        /// Raised when posted data for a control has changed. 
        /// 
        protected virtual void RaisePostDataChangedEvent() {
        }
 

        ///  
        ///  
        /// IButtonControl.Text implementation.  IButtonControl is used internally for adaptive rendering, but
        /// property is explicitly implemented because the developer should use AlternateText, as in V1. 
        /// 
        string IButtonControl.Text {
            get {
                return Text; 
            }
            set { 
                Text = value; 
            }
        } 


        /// 
        ///  
        /// IButtonControl.Text implementation.  IButtonControl is used internally for adaptive rendering, but
        /// property is explicitly implemented because the developer should use AlternateText, as in V1. 
        ///  
        protected virtual string Text {
            get { 
                return AlternateText;
            }
            set {
                AlternateText = value; 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 

namespace System.Web.UI.WebControls { 

    using System;
    using System.Collections;
    using System.Collections.Specialized; 
    using System.ComponentModel;
    using System.Drawing.Design; 
    using System.Globalization; 
    using System.Web;
    using System.Web.UI; 
    using System.Web.Util;


    ///  
    ///    Creates a control that displays an image, responds to mouse clicks,
    ///       and records the mouse pointer position. 
    ///  
    [
    DefaultEvent("Click"), 
    Designer("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + AssemblyRef.SystemDesign),
    SupportsEventValidation,
    ]
    public class ImageButton : Image, IPostBackDataHandler, IPostBackEventHandler, IButtonControl { 

        private static readonly object EventClick = new object(); 
        private static readonly object EventButtonClick = new object(); 
        private static readonly object EventCommand = new object();
 
        private int x = 0;
        private int y = 0;

 
        /// 
        /// Initializes a new instance of the  class. 
        ///  
        public ImageButton() {
        } 


        /// 
        /// Gets or sets the command associated with the  that is propogated in the  event along with the  
        /// property.
        ///  
        [ 
        DefaultValue(""),
        WebCategory("Behavior"), 
        WebSysDescription(SR.WebControl_CommandName),
        Themeable(false),
        ]
        public string CommandName { 
            get {
                string s = (string)ViewState["CommandName"]; 
                return((s == null) ? String.Empty : s); 
            }
            set { 
                ViewState["CommandName"] = value;
            }
        }
 

        ///  
        ///    Gets or sets an optional argument that is propogated in 
        ///       the  event with the associated
        ///     
        ///    property.
        /// 
        [
        Bindable(true), 
        DefaultValue(""),
        Themeable(false), 
        WebCategory("Behavior"), 
        WebSysDescription(SR.WebControl_CommandArgument),
        ] 
        public string CommandArgument {
            get {
                string s = (string)ViewState["CommandArgument"];
                return((s == null) ? String.Empty : s); 
            }
            set { 
                ViewState["CommandArgument"] = value; 
            }
        } 


        /// 
        ///    Gets or sets whether pressing the button causes page validation to fire. This defaults to True so that when 
        ///          using validation controls, the validation state of all controls are updated when the button is clicked, both
        ///          on the client and the server. Setting this to False is useful when defining a cancel or reset button on a page 
        ///          that has validators. 
        /// 
        [ 
        Themeable(false),
        DefaultValue(true),
        WebCategory("Behavior"),
        WebSysDescription(SR.Button_CausesValidation) 
        ]
        public virtual bool CausesValidation { 
            get { 
                object b = ViewState["CausesValidation"];
                return((b == null) ? true : (bool)b); 
            }
            set {
                ViewState["CausesValidation"] = value;
            } 
        }
 
 
        [
        Browsable(true), 
        EditorBrowsableAttribute(EditorBrowsableState.Always),
        Bindable(true),
        WebCategory("Behavior"),
        DefaultValue(true), 
        WebSysDescription(SR.WebControl_Enabled)
        ] 
        public override bool Enabled { 
            get {
                return base.Enabled; 
            }
            set {
                base.Enabled = value;
            } 
        }
 
        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        EditorBrowsable(EditorBrowsableState.Never),
        Themeable(false),
        ]
        public override bool GenerateEmptyAlternateText { 
            get {
                return base.GenerateEmptyAlternateText; 
            } 
            set {
                throw new NotSupportedException(SR.GetString( 
                    SR.Property_Set_Not_Supported, "GenerateEmptyAlternateText", this.GetType().ToString()));
            }
        }
 

        ///  
        ///    The script that is executed on a client-side click. 
        /// 
        [ 
        DefaultValue(""),
        WebCategory("Behavior"),
        WebSysDescription(SR.Button_OnClientClick),
        Themeable(false), 
        ]
        public virtual string OnClientClick { 
            get { 
                string s = (string)ViewState["OnClientClick"];
                if (s == null) { 
                    return String.Empty;
                }
                return s;
            } 
            set {
                ViewState["OnClientClick"] = value; 
            } 
        }
 

        [
        DefaultValue(""),
        Editor("System.Web.UI.Design.UrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), 
        Themeable(false),
        UrlProperty("*.aspx"), 
        WebCategory("Behavior"), 
        WebSysDescription(SR.Button_PostBackUrl),
        ] 
        public virtual string PostBackUrl {
            get {
                string s = (string)ViewState["PostBackUrl"];
                return s == null? String.Empty : s; 
            }
            set { 
                ViewState["PostBackUrl"] = value; 
            }
        } 

        public override bool SupportsDisabledAttribute {
            get {
                return true; 
            }
        } 
 
        /// 
        ///     Gets a value that represents the tag HtmlTextWriterTag.Input. This property is read-only. 
        /// 
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        protected override HtmlTextWriterTag TagKey { 
            get { 
                return HtmlTextWriterTag.Input;
            } 
        }


        [ 
        WebCategory("Behavior"),
        Themeable(false), 
        DefaultValue(""), 
        WebSysDescription(SR.PostBackControl_ValidationGroup)
        ] 
        public virtual string ValidationGroup {
            get {
                string s = (string)ViewState["ValidationGroup"];
                return((s == null) ? String.Empty : s); 
            }
            set { 
                ViewState["ValidationGroup"] = value; 
            }
        } 


        /// 
        /// Represents the method that will handle the  event of an . 
        /// 
        [ 
        WebCategory("Action"), 
        WebSysDescription(SR.ImageButton_OnClick)
        ] 
        public event ImageClickEventHandler Click {
            add {
                Events.AddHandler(EventClick, value);
            } 
            remove {
                Events.RemoveHandler(EventClick, value); 
            } 
        }
 

        /// 
        /// Represents the method that will handle the  event of an .
        ///  
        event EventHandler IButtonControl.Click {
            add { 
                Events.AddHandler(EventButtonClick, value); 
            }
            remove { 
                Events.RemoveHandler(EventButtonClick, value);
            }
        }
 

        ///  
        /// Represents the method that will handle the  event of an . 
        /// 
        [ 
        WebCategory("Action"),
        WebSysDescription(SR.ImageButton_OnCommand)
        ]
        public event CommandEventHandler Command { 
            add {
                Events.AddHandler(EventCommand, value); 
            } 
            remove {
                Events.RemoveHandler(EventCommand, value); 
            }
        }

 
        /// 
        ///  
        /// Adds the attributes of an  to the output 
        ///    stream for rendering on the client.
        ///  
        protected override void AddAttributesToRender(HtmlTextWriter writer) {
            Page page = Page;

            // Make sure we are in a form tag with runat=server. 
            if (page != null) {
                page.VerifyRenderingInServerForm(this); 
            } 

            writer.AddAttribute(HtmlTextWriterAttribute.Type,"image"); 

            string uniqueID = UniqueID;
            PostBackOptions options = GetPostBackOptions();
 
            // Don't render Name on a button if __doPostBack is posting back to a different control
            // because Page will register this control as requiring post back notification even though 
            // it's not the target of the postback.  If the TargetControl isn't this control, this control's 
            // RaisePostBackEvent should never get called.  See VSWhidbey 477095.
            if (uniqueID != null && (options == null || options.TargetControl == this)) { 
                writer.AddAttribute(HtmlTextWriterAttribute.Name, uniqueID);
            }

            // 

            bool effectiveEnabled = IsEnabled; 
 

            string onClick = String.Empty; 

            if (effectiveEnabled) {
                // Need to merge the onclick attribute with the OnClientClick
                onClick = Util.EnsureEndWithSemiColon(OnClientClick); 
                if (HasAttributes) {
                    string userOnClick = Attributes["onclick"]; 
                    if (userOnClick != null) { 
                        onClick += Util.EnsureEndWithSemiColon(userOnClick);
                        Attributes.Remove("onclick"); 
                    }
                }
            }
 
            if (Enabled && !effectiveEnabled && SupportsDisabledAttribute) {
                // We need to do the cascade effect on the server, because the browser 
                // only renders as disabled, but doesn't disable the functionality. 
                writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
            } 

            base.AddAttributesToRender(writer);

            if (page != null && options != null) { 
                page.ClientScript.RegisterForEventValidation(options);
 
                if (effectiveEnabled) { 
                    string postBackEventReference = page.ClientScript.GetPostBackEventReference(options, false);
                    if (!String.IsNullOrEmpty(postBackEventReference)) { 
                        onClick = Util.MergeScript(onClick, postBackEventReference);
                        if (options.ClientSubmit) {
                            // Dev10 Bugs 584471
                            // a derived control may return PostBackOptions with ClientSubmit=true, 
                            // such as DataControlImageButton. Without a return false, there would be
                            // a double submit. 
                            onClick = Util.EnsureEndWithSemiColon(onClick) + "return false;"; 
                        }
                    } 
                }
            }

            if (onClick.Length > 0) { 
                writer.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
 
                if (EnableLegacyRendering) { 
                    writer.AddAttribute("language", "javascript", false);
                } 
            }
        }

        // Returns the client post back options. 
        protected virtual PostBackOptions GetPostBackOptions() {
            PostBackOptions options = new PostBackOptions(this, String.Empty); 
            // The postback script ends up in onclick, not href, 
            // so we shouldn't force the javascript protocol like we do in LinkButton.
            options.ClientSubmit = false; 

            if (!String.IsNullOrEmpty(PostBackUrl)) {
                options.ActionUrl = HttpUtility.UrlPathEncode(ResolveClientUrl(PostBackUrl));
            } 

            if (CausesValidation && Page != null && Page.GetValidators(ValidationGroup).Count > 0) { 
                options.PerformValidation = true; 
                options.ValidationGroup = ValidationGroup;
            } 

            return options;
        }
 

        ///  
        ///  
        /// Processes posted data for the  control.
        ///  
        bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) {
            return LoadPostData(postDataKey, postCollection);
        }
 

        ///  
        ///  
        /// Processes posted data for the  control.
        ///  
        protected virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) {
            string name = UniqueID;
            string postX = postCollection[name + ".x"];
            string postY = postCollection[name + ".y"]; 
            if (postX != null && postY != null && postX.Length > 0 && postY.Length > 0) {
                x = Int32.Parse(postX, CultureInfo.InvariantCulture); 
                y = Int32.Parse(postY, CultureInfo.InvariantCulture); 
                if (Page != null) {
                    Page.RegisterRequiresRaiseEvent(this); 
                }
            }
            return false;
        } 

 
        ///  
        /// Raises the  event.
        ///  
        protected virtual void OnClick(ImageClickEventArgs e) {
            ImageClickEventHandler onClickHandler = (ImageClickEventHandler)Events[EventClick];
            if (onClickHandler != null) onClickHandler(this,e);
 
            EventHandler onButtonClickHandler = (EventHandler)Events[EventButtonClick];
            if (onButtonClickHandler != null) onButtonClickHandler(this,(EventArgs)e); 
        } 

 
        /// 
        /// Raises the  event.
        /// 
        protected virtual void OnCommand(CommandEventArgs e) { 
            CommandEventHandler onCommandHandler = (CommandEventHandler)Events[EventCommand];
            if (onCommandHandler != null) 
                onCommandHandler(this,e); 

            // Command events are bubbled up the control heirarchy 
            RaiseBubbleEvent(this, e);
        }

 
        /// 
        ///  
        ///     
        ///       Determine
        ///       if the image has been clicked prior to rendering on the client.  
        /// 
        protected internal override void OnPreRender(EventArgs e) {
            base.OnPreRender(e);
            if (Page != null) { 
                Page.RegisterRequiresPostBack(this);
 
                if (IsEnabled && 
                    ((CausesValidation && Page.GetValidators(ValidationGroup).Count > 0) ||
                     !String.IsNullOrEmpty(PostBackUrl))) { 
                    Page.RegisterWebFormsScript();  // VSWhidbey 489577
                }
            }
        } 

 
        ///  
        /// 
        /// Raises events on post back for the  
        /// control.
        /// 
        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) {
            RaisePostBackEvent(eventArgument); 
        }
 
 
        /// 
        ///  
        /// Raises events on post back for the 
        /// control.
        /// 
        protected virtual void RaisePostBackEvent(string eventArgument) { 
            ValidateEvent(this.UniqueID, eventArgument);
 
            if (CausesValidation) { 
                Page.Validate(ValidationGroup);
            } 
            OnClick(new ImageClickEventArgs(x,y));
            OnCommand(new CommandEventArgs(CommandName, CommandArgument));

        } 

 
        ///  
        /// 
        /// Raised when posted data for a control has changed. 
        /// 
        void IPostBackDataHandler.RaisePostDataChangedEvent() {
            RaisePostDataChangedEvent();
        } 

 
        ///  
        /// 
        /// Raised when posted data for a control has changed. 
        /// 
        protected virtual void RaisePostDataChangedEvent() {
        }
 

        ///  
        ///  
        /// IButtonControl.Text implementation.  IButtonControl is used internally for adaptive rendering, but
        /// property is explicitly implemented because the developer should use AlternateText, as in V1. 
        /// 
        string IButtonControl.Text {
            get {
                return Text; 
            }
            set { 
                Text = value; 
            }
        } 


        /// 
        ///  
        /// IButtonControl.Text implementation.  IButtonControl is used internally for adaptive rendering, but
        /// property is explicitly implemented because the developer should use AlternateText, as in V1. 
        ///  
        protected virtual string Text {
            get { 
                return AlternateText;
            }
            set {
                AlternateText = value; 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK