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



using System;

using System.Diagnostics;



namespace Microsoft.WindowsAPICodePack.Dialogs.Controls

{

    /// <summary>

    ///  Defines the text box controls in the Common File Dialog.

    /// </summary>

    public class CommonFileDialogTextBox : CommonFileDialogControl

    {

        /// <summary>

        /// Creates a new instance of this class.

        /// </summary>

        public CommonFileDialogTextBox() : base(string.Empty) { }



        /// <summary>

        /// Creates a new instance of this class with the specified text.

        /// </summary>

        /// <param name="text">The text to display for this control.</param>

        public CommonFileDialogTextBox(string text) : base(text) { }



        /// <summary>

        /// Creates a new instance of this class with the specified name and text.

        /// </summary>

        /// <param name="name">The name of this control.</param>

        /// <param name="text">The text to display for this control.</param>

        public CommonFileDialogTextBox(string name, string text) : base(name, text) { }



        internal bool Closed { get; set; }



        /// <summary>

        /// Gets or sets a value for the text string contained in the CommonFileDialogTextBox.

        /// </summary>

        public override string Text

        {

            get

            {

                if (!Closed)

                {

                    SyncValue();

                }



                return base.Text;

            }



            set

            {

                if (customizedDialog != null)

                {

                    customizedDialog.SetEditBoxText(this.Id, value);

                }



                base.Text = value;

            }

        }



        /// <summary>

        /// Holds an instance of the customized (/native) dialog and should

        /// be null until after the Attach() call is made.

        /// </summary>

        private IFileDialogCustomize customizedDialog;



        /// <summary>

        /// Attach the TextBox control to the dialog object

        /// </summary>

        /// <param name="dialog">Target dialog</param>

        internal override void Attach(IFileDialogCustomize dialog)

        {

            Debug.Assert(dialog != null, "CommonFileDialogTextBox.Attach: dialog parameter can not be null");



            // Add a text entry control

            dialog.AddEditBox(this.Id, this.Text);



            // Set to local instance in order to gate access to same.

            customizedDialog = dialog;



            // Sync unmanaged properties with managed properties

            SyncUnmanagedProperties();



            Closed = false;

        }



        internal void SyncValue()

        {

            // Make sure that the local native dialog instance is NOT 

            // null. If it's null, just return the "textValue" var,

            // otherwise, use the native call to get the text value, 

            // setting the textValue member variable then return it.



            if (customizedDialog != null)

            {

                string textValue;

                customizedDialog.GetEditBoxText(this.Id, out textValue);



                base.Text = textValue;

            }

        }

    }

}