/*************************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2007-2013 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   For more features, controls, and fast professional support,
   pick up the Plus Edition at http://xceed.com/wpf_toolkit

   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids

  ***********************************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Xceed.Wpf.AvalonDock.Layout;

namespace Xceed.Wpf.AvalonDock.Controls
{
    public class LayoutDocumentControl : Control
    {
        static LayoutDocumentControl()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(LayoutDocumentControl), new FrameworkPropertyMetadata(typeof(LayoutDocumentControl)));
            FocusableProperty.OverrideMetadata(typeof(LayoutDocumentControl), new FrameworkPropertyMetadata(false));
        }

        public LayoutDocumentControl()
        {
            //SetBinding(FlowDirectionProperty, new Binding("Model.Root.Manager.FlowDirection") { Source = this });
        }


        #region Model

        /// <summary>
        /// Model Dependency Property
        /// </summary>
        public static readonly DependencyProperty ModelProperty =
            DependencyProperty.Register("Model", typeof(LayoutContent), typeof(LayoutDocumentControl),
                new FrameworkPropertyMetadata((LayoutContent)null,
                    new PropertyChangedCallback(OnModelChanged)));

        /// <summary>
        /// Gets or sets the Model property.  This dependency property 
        /// indicates the model attached to this view.
        /// </summary>
        public LayoutContent Model
        {
            get { return (LayoutContent)GetValue(ModelProperty); }
            set { SetValue(ModelProperty, value); }
        }

        /// <summary>
        /// Handles changes to the Model property.
        /// </summary>
        private static void OnModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ((LayoutDocumentControl)d).OnModelChanged(e);
        }

        /// <summary>
        /// Provides derived classes an opportunity to handle changes to the Model property.
        /// </summary>
        protected virtual void OnModelChanged(DependencyPropertyChangedEventArgs e)
        {
          if( e.OldValue != null )
          {
            ((LayoutContent)e.OldValue).PropertyChanged -= Model_PropertyChanged;
          }

          if( Model != null )
          {
            Model.PropertyChanged += Model_PropertyChanged;
            SetLayoutItem( Model.Root.Manager.GetLayoutItemFromModel( Model ) );
          }
          else
            SetLayoutItem( null );
        }

        private void Model_PropertyChanged( object sender, System.ComponentModel.PropertyChangedEventArgs e )
        {
          if( e.PropertyName == "IsEnabled" )
          {
            if( Model != null )
            {
              IsEnabled = Model.IsEnabled;
              if( !IsEnabled && Model.IsActive )
              {
                if( (Model.Parent != null) && (Model.Parent is LayoutDocumentPane) )
                {
                  ((LayoutDocumentPane)Model.Parent).SetNextSelectedIndex();
                }
              }
            }
          }
        }
        #endregion

        #region LayoutItem

        /// <summary>
        /// LayoutItem Read-Only Dependency Property
        /// </summary>
        private static readonly DependencyPropertyKey LayoutItemPropertyKey
            = DependencyProperty.RegisterReadOnly("LayoutItem", typeof(LayoutItem), typeof(LayoutDocumentControl),
                new FrameworkPropertyMetadata((LayoutItem)null));

        public static readonly DependencyProperty LayoutItemProperty
            = LayoutItemPropertyKey.DependencyProperty;

        /// <summary>
        /// Gets the LayoutItem property.  This dependency property 
        /// indicates the LayoutItem attached to this tag item.
        /// </summary>
        public LayoutItem LayoutItem
        {
            get { return (LayoutItem)GetValue(LayoutItemProperty); }
        }

        /// <summary>
        /// Provides a secure method for setting the LayoutItem property.  
        /// This dependency property indicates the LayoutItem attached to this tag item.
        /// </summary>
        /// <param name="value">The new value for the property.</param>
        protected void SetLayoutItem(LayoutItem value)
        {
            SetValue(LayoutItemPropertyKey, value);
        }

        #endregion

        protected override void OnPreviewGotKeyboardFocus(System.Windows.Input.KeyboardFocusChangedEventArgs e)
        {
            if (Model != null)
                Model.IsActive = true;
            base.OnPreviewGotKeyboardFocus(e);
        }


    }
}