Signum Framework Principles

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 Signum.Entities;
using System.Collections;
using Signum.Utilities;
using Signum.Entities.Basics;

namespace Signum.Windows
{
    /// <summary>
    /// Interaction logic for ListaNavegacion.xaml
    /// </summary>
    public partial class LeftNavigationPanel : UserControl
    {


        public IHaveQuickLinks IHasQuickLinks { get; set; }

        public LeftNavigationPanel()
        {
            InitializeComponent();

            this.DataContextChanged += new DependencyPropertyChangedEventHandler(LeftNavigationPanel_DataContextChanged);

            lvQuickLinks.AddHandler(Button.ClickEvent, new RoutedEventHandler(QuickLink_MouseDown));

            lvNotas.AddHandler(Button.ClickEvent, new RoutedEventHandler(Note_MouseDown));
        }

        void LeftNavigationPanel_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
        {

            if (IHasQuickLinks!= null)
            {
                lvQuickLinks.ItemsSource = IHasQuickLinks.QuickLinks();
                borderQuickLinks.Visibility = Visibility.Visible;
            }
            else
            {
                borderQuickLinks.Visibility = Visibility.Collapsed;
            }

            ReloadNotes();


            if (borderQuickLinks.Visibility == Visibility.Collapsed &&
               borderNotas.Visibility == Visibility.Collapsed)
            {
                Visibility = Visibility.Collapsed;
            }
            else
            {
                Visibility = Visibility.Visible;
            }

            if (borderQuickLinks.Visibility == Visibility.Collapsed && ((IList)lvNotas.ItemsSource).Map(a=>a == null || a.Count == 0))
            {
                expander.IsExpanded = false;
            }
        }

        private void ReloadNotes()
        {
            if (NotesProvider.Manager != null && DataContext is IdentifiableEntity)
            {
                List<Lazy<INoteDN>> notes = NotesProvider.Manager.RetrieveNotes((IdentifiableEntity)DataContext);

                if (notes == null)
                    borderNotas.Visibility = Visibility.Collapsed;
                else
                {
                    borderNotas.Visibility = Visibility.Visible;
                    tbNotas.FontWeight = notes.Count == 0 ? FontWeights.Normal : FontWeights.Bold;
                }

                lvNotas.ItemsSource = notes;
            }
            else
            {
                borderNotas.Visibility = Visibility.Collapsed;
            }
        }

        private void QuickLink_MouseDown(object sender, RoutedEventArgs e)
        {
            if (e.OriginalSource is Button) //Not to capture the mouseDown of the scrollbar buttons
            {
                Button b = (Button)e.OriginalSource;
                ((Action)b.Tag).Invoke();
            }
        }
        private void Note_MouseDown(object sender, RoutedEventArgs e)
        {
            if (e.OriginalSource is Button) //Not to capture the mouseDown of the scrollbar buttons
            {
                Button b = (Button)e.OriginalSource;
                Lazy<INoteDN> nota = (Lazy<INoteDN>)b.Tag;
                ViewNote(Server.RetrieveFromLazyAndForget(nota));
            }
        }

        private void btnNewNote_Click(object sender, RoutedEventArgs e)
        {
            INoteDN nota = NotesProvider.Manager.CreateNote((IdentifiableEntity)DataContext);

            ViewNote(nota); 
        }

        void ViewNote(INoteDN note)
        {
            INoteDN result = (INoteDN)Navigator.View(new ViewOptions { Buttons = ViewButtons.SaveClose, Modal = true }, note);

            ReloadNotes();
        }

    }

    /// <summary>
    /// Controls must implement this interface to have the left navigation panel
    /// </summary>
    public interface IHaveQuickLinks
    {
        List<QuickLink> QuickLinks();
    }

    /// <summary>
    /// Represents an item of the left navigation panel
    /// </summary>
    public class QuickLink
    {
        public QuickLink(string label)
        {
            this.Label = label;
        }

        /// <summary>
        /// Display name of the item
        /// </summary>
        public string Label { get; set; }

        /// <summary>
        /// Action to be executed on the mouseDoubleClick of the item
        /// </summary>
        public Action Action { get; set; }
    }

}