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using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Input;
using System.Linq;
using System.Windows.Media;
using System.Windows.Threading;
namespace Tango.SharedUI.Controls
{
[TemplatePart(Name = SearchComboBox.PartEditor, Type = typeof(System.Windows.Controls.TextBox))]
public class SearchComboBox : ComboBox
{
public const string PartEditor = "Search";
private TextBox _textBox;
private ListBox _listBox;
private ICollectionView _view;
#region Properties
public bool IsOpened
{
get { return (bool)GetValue(IsOpenedProperty); }
set { SetValue(IsOpenedProperty, value); }
}
public static readonly DependencyProperty IsOpenedProperty =
DependencyProperty.Register("IsOpened", typeof(bool), typeof(SearchComboBox), new PropertyMetadata(false, (d, e) => (d as SearchComboBox).OnIsOpenedChanged()));
public String SearchProperty
{
get { return (String)GetValue(SearchPropertyProperty); }
set { SetValue(SearchPropertyProperty, value); }
}
public static readonly DependencyProperty SearchPropertyProperty =
DependencyProperty.Register("SearchProperty", typeof(String), typeof(SearchComboBox), new PropertyMetadata(null));
public String SearchFilter
{
get { return (String)GetValue(SearchFilterProperty); }
set { SetValue(SearchFilterProperty, value); }
}
public static readonly DependencyProperty SearchFilterProperty =
DependencyProperty.Register("SearchFilter", typeof(String), typeof(SearchComboBox), new PropertyMetadata(null, (d, e) => (d as SearchComboBox).OnFilterChanged()));
public IEnumerable ListItemsSource
{
get { return (IEnumerable)GetValue(ListItemsSourceProperty); }
set { SetValue(ListItemsSourceProperty, value); }
}
public static readonly DependencyProperty ListItemsSourceProperty =
DependencyProperty.Register("ListItemsSource", typeof(IEnumerable), typeof(SearchComboBox), new PropertyMetadata(null));
#endregion
#region Constructors
static SearchComboBox()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(SearchComboBox), new FrameworkPropertyMetadata(typeof(SearchComboBox)));
}
#endregion //Constructors
#region Initialization
/// <summary>
/// When overridden in a derived class, is invoked whenever application code or internal processes call <see cref="M:System.Windows.FrameworkElement.ApplyTemplate" />.
/// </summary>
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_textBox = GetTemplateChild(PartEditor) as TextBox;
if(_textBox != null)
{
_textBox.PreviewKeyDown += _textBox_KeyDown;
}
_listBox = GetTemplateChild("list") as ListBox;
if(_listBox != null)
{
_listBox.PreviewKeyDown += _listBox_PreviewKeyDown;
_listBox.PreviewMouseLeftButtonUp += _listBox_PreviewMouseLeftButtonUp;
}
}
#endregion
#region Event Handlers
private void _listBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Return)
{
IsOpened = false;
SelectedItem = _listBox.SelectedItem;
}
}
private void _textBox_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Down)
{
_listBox.SelectedIndex = 0;
_listBox.Focus();
Keyboard.Focus(_listBox);
}
}
private void _listBox_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (!(e.OriginalSource is Thumb))
{
IsOpened = false;
SelectedItem = _listBox.SelectedItem;
}
}
private async void OnIsOpenedChanged()
{
if (IsOpened)
{
_listBox.SelectedItem = SelectedItem;
SearchFilter = "";
await Task.Delay(100);
_textBox.Focus();
Keyboard.Focus(_textBox);
}
}
private void OnFilterChanged()
{
_view?.Refresh();
}
#endregion
#region Override
protected override void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
{
base.OnItemsSourceChanged(oldValue, newValue);
if (ItemsSource != null)
{
ListItemsSource = ItemsSource.Cast<Object>().ToList();
_view = CollectionViewSource.GetDefaultView(ListItemsSource);
_view.Filter = (x) =>
{
if (String.IsNullOrWhiteSpace(SearchFilter) || SearchFilter == null) return true;
if (x != null)
{
var prop = x.GetType().GetProperty(SearchProperty);
// var prop = x.GetType().GetProperty(SearchProperty, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.DeclaredOnly);
if (prop != null)
{
String propValue = prop.GetValue(x).ToString();
return propValue.ToLower().Contains(SearchFilter.ToLower());
}
}
return false;
};
}
}
protected override void OnSelectionChanged(SelectionChangedEventArgs e)
{
base.OnSelectionChanged(e);
}
#endregion
}
}
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