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

namespace System.Web.UI.WebControls {

    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Web.UI;

    /// <devdoc>
    /// <para>Creates a special column with buttons for <see langword='Edit'/>,
    /// <see langword='Update'/>, and <see langword='Cancel'/> commands to edit items
    ///    within the selected row.</para>
    /// </devdoc>
    public class EditCommandColumn : DataGridColumn {


        /// <devdoc>
        /// <para>Initializes a new instance of an <see cref='System.Web.UI.WebControls.EditCommandColumn'/> class.</para>
        /// </devdoc>
        public EditCommandColumn() {
        }



        /// <devdoc>
        ///    <para>Indicates the button type for the column.</para>
        /// </devdoc>
        [
        DefaultValue(ButtonColumnType.LinkButton)
        ]
        public virtual ButtonColumnType ButtonType {
            get {
                object o = ViewState["ButtonType"];
                if (o != null)
                    return(ButtonColumnType)o;
                return ButtonColumnType.LinkButton;
            }
            set {
                if (value < ButtonColumnType.LinkButton || value > ButtonColumnType.PushButton) {
                    throw new ArgumentOutOfRangeException("value");
                }
                ViewState["ButtonType"] = value;
                OnColumnChanged();
            }
        }


        /// <devdoc>
        /// <para>Indicates the text to display for the <see langword='Cancel'/> command button
        ///    in the column.</para>
        /// </devdoc>
        [
        Localizable(true),
        DefaultValue("")
        ]
        public virtual string CancelText {
            get {
                object o = ViewState["CancelText"];
                if (o != null)
                    return(string)o;
                return String.Empty;
            }
            set {
                ViewState["CancelText"] = value;
                OnColumnChanged();
            }
        }


        [
        DefaultValue(true),
        ]
        public virtual bool CausesValidation {
            get {
                object o = ViewState["CausesValidation"];
                if (o != null) {
                    return (bool)o;
                }
                return true;
            }
            set {
                ViewState["CausesValidation"] = value;
                OnColumnChanged();
            }
        }


        /// <devdoc>
        /// <para>Indicates the text to display for the <see langword='Edit'/> command button in
        ///    the column.</para>
        /// </devdoc>
        [
        Localizable(true),
        DefaultValue("")
        ]
        public virtual string EditText {
            get {
                object o = ViewState["EditText"];
                if (o != null)
                    return(string)o;
                return String.Empty;
            }
            set {
                ViewState["EditText"] = value;
                OnColumnChanged();
            }
        }


        /// <devdoc>
        /// <para>Indicates the text to display for the <see langword='Update'/> command button
        ///    in the column.</para>
        /// </devdoc>
        [
        Localizable(true),
        DefaultValue("")
        ]
        public virtual string UpdateText {
            get {
                object o = ViewState["UpdateText"];
                if (o != null)
                    return(string)o;
                return String.Empty;
            }
            set {
                ViewState["UpdateText"] = value;
                OnColumnChanged();
            }
        }


        [
        DefaultValue(""),
        ]
        public virtual string ValidationGroup {
            get {
                object o = ViewState["ValidationGroup"];
                if (o != null) {
                    return (string)o;
                }
                return String.Empty;
            }
            set {
                ViewState["ValidationGroup"] = value;
                OnColumnChanged();
            }
        }

        private void AddButtonToCell(TableCell cell,  string commandName, string buttonText, bool causesValidation, string validationGroup) {
            WebControl buttonControl = null;
            ControlCollection controls = cell.Controls;
            ButtonColumnType buttonType = ButtonType;

            if (buttonType == ButtonColumnType.LinkButton) {
                LinkButton button = new DataGridLinkButton();

                buttonControl = button;
                button.CommandName = commandName;
                button.Text = buttonText;
                button.CausesValidation = causesValidation;
                button.ValidationGroup = validationGroup;
            }
            else {
                Button button = new Button();

                buttonControl = button;
                button.CommandName = commandName;
                button.Text = buttonText;
                button.CausesValidation = causesValidation;
                button.ValidationGroup = validationGroup;
            }

            controls.Add(buttonControl);
        }


        /// <devdoc>
        ///    <para>Initializes a cell within the column.</para>
        /// </devdoc>
        public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) {
            base.InitializeCell(cell, columnIndex, itemType);
            bool causesValidation = CausesValidation;

            if ((itemType != ListItemType.Header) &&
                (itemType != ListItemType.Footer)) {
                if (itemType == ListItemType.EditItem) {
                    ControlCollection controls = cell.Controls;
                    AddButtonToCell(cell, DataGrid.UpdateCommandName, UpdateText, causesValidation, ValidationGroup);

                    LiteralControl spaceControl = new LiteralControl("&nbsp;");
                    controls.Add(spaceControl);

                    AddButtonToCell(cell, DataGrid.CancelCommandName, CancelText, false, String.Empty);
                }
                else {
                    AddButtonToCell(cell, DataGrid.EditCommandName, EditText, false, String.Empty);
                }
            }
        }
    }
}