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using System;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
namespace Xamarin.PropertyEditing.Windows
{
[TemplatePart (Name = "List", Type = typeof(ItemsControl))]
[TemplatePart (Name = "EditorPresenter", Type = typeof(Selector))]
internal class GroupEditorControl
: Selector
{
static GroupEditorControl ()
{
FocusableProperty.OverrideMetadata (typeof(GroupEditorControl), new FrameworkPropertyMetadata (false));
}
public GroupEditorControl ()
{
ItemContainerGenerator.StatusChanged += OnItemContainerGeneratorStatusChanged;
}
public static readonly DependencyProperty ContentTemplateProperty = DependencyProperty.Register (
"ContentTemplate", typeof(DataTemplate), typeof(GroupEditorControl), new PropertyMetadata (default(DataTemplate)));
public DataTemplate ContentTemplate
{
get { return (DataTemplate) GetValue (ContentTemplateProperty); }
set { SetValue (ContentTemplateProperty, value); }
}
public static readonly DependencyProperty ContentTemplateSelectorProperty = DependencyProperty.Register (
"ContentTemplateSelector", typeof(DataTemplateSelector), typeof(GroupEditorControl), new PropertyMetadata (default(DataTemplateSelector)));
public DataTemplateSelector ContentTemplateSelector
{
get { return (DataTemplateSelector) GetValue (ContentTemplateSelectorProperty); }
set { SetValue (ContentTemplateSelectorProperty, value); }
}
public static readonly DependencyProperty SelectorStyleProperty = DependencyProperty.Register (
"SelectorStyle", typeof(Style), typeof(GroupEditorControl), new PropertyMetadata (default(Style)));
public Style SelectorStyle
{
get { return (Style) GetValue (SelectorStyleProperty); }
set { SetValue (SelectorStyleProperty, value); }
}
protected override void OnSelectionChanged (SelectionChangedEventArgs e)
{
if (e.AddedItems.Count == 0)
return;
DependencyObject container = ItemContainerGenerator.ContainerFromItem (e.AddedItems[0]);
if (container == null || VisualTreeHelper.GetChildrenCount (container) == 0)
return;
var presenter = container as ContentPresenter;
if (presenter == null)
throw new InvalidOperationException ("Unexpected visual tree");
var toggle = VisualTreeHelper.GetChild (presenter, 0) as ToggleButton;
if (toggle == null)
throw new InvalidOperationException ("Children must be ToggleButton's");
toggle.IsChecked = true;
}
protected override void OnItemsChanged (NotifyCollectionChangedEventArgs e)
{
base.OnItemsChanged (e);
if (SelectedItem == null && Items.Count > 0)
SelectedIndex = 0;
}
protected override void OnKeyDown (KeyEventArgs e)
{
base.OnKeyDown (e);
if (e.Key == Key.Down && SelectedIndex < Items.Count - 1)
SetCurrentValue (SelectedIndexProperty, SelectedIndex + 1);
else if (e.Key == Key.Up && SelectedIndex >= 1)
SetCurrentValue (SelectedIndexProperty, SelectedIndex - 1);
}
private void OnItemContainerGeneratorStatusChanged (object sender, EventArgs args)
{
if (ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)
return;
if (SelectedItem == null && Items.Count > 0)
SetCurrentValue (SelectedItemProperty, Items[0]);
for (int i = 0; i < Items.Count; i++) {
var container = ItemContainerGenerator.ContainerFromIndex (i) as ContentPresenter;
if (container == null)
throw new InvalidOperationException ("Unexpected visual tree");
container.ApplyTemplate ();
var child = VisualTreeHelper.GetChild (container, 0);
var toggle = child as ToggleButton;
if (toggle == null)
throw new InvalidOperationException ("Children must be of ToggleButton");
if (Equals (SelectedItem, container.DataContext))
toggle.IsChecked = true;
toggle.Checked -= OnChoiceSelected;
toggle.Checked += OnChoiceSelected;
}
}
private void OnChoiceSelected (object sender, RoutedEventArgs e)
{
object selected = ((FrameworkElement) sender).DataContext;
SetCurrentValue (SelectedItemProperty, selected);
}
}
}
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