//------------------------------------------------------------------------------
// <copyright file="DataControlImageButton.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>                                                                
//------------------------------------------------------------------------------

namespace System.Web.UI.WebControls {

    using System;
    using System.Drawing;
    using System.Web.Util;


    /// <devdoc>
    ///  Derived version of ImageButton used within a DataControl.
    /// </devdoc>
    [SupportsEventValidation]
    internal sealed class DataControlImageButton : ImageButton {
        
        IPostBackContainer _container;
        string _callbackArgument;
        bool _enableCallback;

        internal DataControlImageButton(IPostBackContainer container) {
            _container = container;
        }

        public override bool CausesValidation {
            get {
                return false;
            }
            set {
                throw new NotSupportedException(SR.GetString(SR.CannotSetValidationOnDataControlButtons));
            }
        }
        
        internal void EnableCallback(string argument) {
            _enableCallback = true;
            _callbackArgument = argument;
        }

        protected sealed override PostBackOptions GetPostBackOptions() {
            if (_container != null) {
                return _container.GetPostBackOptions(this);
            }

            return base.GetPostBackOptions();
        }

        protected internal override void Render(HtmlTextWriter writer) {
            SetCallbackProperties();
            base.Render(writer);
        }

        private void SetCallbackProperties() {
            if (_enableCallback) {
                ICallbackContainer _callbackContainer = _container as ICallbackContainer;
                if (_callbackContainer != null) {
                    string callbackScript = _callbackContainer.GetCallbackScript(this, _callbackArgument);
                    if (!String.IsNullOrEmpty(callbackScript)) {
                        this.OnClientClick = callbackScript;
                    }
                }
            }
        }
    }
}