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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;
namespace Xamarin.PropertyEditing.Windows
{
internal class ChoiceItem
: NotifyingObject
{
public string Name
{
get { return this.name; }
set
{
if (this.name == value)
return;
this.name = value;
OnPropertyChanged();
}
}
public string Tooltip
{
get { return this.tooltip; }
set
{
if (this.tooltip == value)
return;
this.tooltip = value;
OnPropertyChanged();
}
}
public object Value
{
get { return this.value; }
set
{
if (this.value == value)
return;
this.value = value;
OnPropertyChanged();
}
}
private object value;
private string tooltip;
private string name;
}
[TemplatePart (Name = "list", Type = typeof(ListBox))]
internal class ChoiceControl
: Selector
{
public ChoiceControl ()
{
ItemContainerGenerator.StatusChanged += OnItemContainerGeneratorOnStatusChanged;
}
public event EventHandler SelectedItemChanged;
protected override void OnSelectionChanged (SelectionChangedEventArgs e)
{
if (e.RemovedItems.Count > 0) {
var removedToggle = GetToggle (e.RemovedItems[0]);
if (removedToggle != null)
removedToggle.IsChecked = false;
}
if (e.AddedItems.Count > 0) {
var addedToggle = GetToggle (e.AddedItems[0]);
if (addedToggle != null)
addedToggle.IsChecked = true;
}
}
internal void FocusSelectedItem ()
{
var container = ItemContainerGenerator.ContainerFromIndex (SelectedIndex) as ContentPresenter;
if (container == null)
throw new InvalidOperationException ("Unexpected visual tree");
var toggle = VisualTreeHelper.GetChild (container, 0) as ToggleButton;
if (toggle == null)
throw new InvalidOperationException ("Children must be of ToggleButton");
toggle.Focus ();
}
private ToggleButton GetToggle (object item)
{
var presenter = (ContentPresenter) ItemContainerGenerator.ContainerFromItem (item);
if (presenter == null)
return null;
return VisualTreeHelper.GetChild (presenter, 0) as ToggleButton;
}
private void OnItemContainerGeneratorOnStatusChanged (object sender, EventArgs args)
{
if (ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated || (ItemTemplate == null && ItemTemplateSelector == null))
return;
// Note: this does not handle a changing items ItemsSource. It's not something that's currently required and unlikely to be.
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. This exception may be caused by an error in the template, an uninitialized template, or a disposed template.");
if (Equals (SelectedItem, container.DataContext))
toggle.IsChecked = true;
toggle.Checked += OnChoiceSelected;
}
}
private void OnChoiceSelected (object sender, RoutedEventArgs e)
{
object selected = ((FrameworkElement) sender).DataContext;
SetCurrentValue (SelectedItemProperty, selected);
SelectedItemChanged?.Invoke (sender, EventArgs.Empty);
}
}
}
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