// Handles selected color changed
private static void OnSelectedColorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ColorGallery gallery = d as ColorGallery;
// Raise event
gallery.RaiseEvent(new RoutedEventArgs(ColorGallery.SelectedColorChangedEvent));
// Set color in gallery
Color?color = (Color?)e.NewValue;
gallery.UpdateSelectedColor(color);
}
private static void OnThemeColorsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ColorGallery gal = d as ColorGallery;
gal.ThemeColors.Clear();
if (e.NewValue != null)
{
foreach (Color color in (e.NewValue as IEnumerable <Color>))
{
gal.ThemeColors.Add(color);
}
}
}
/// <summary>
/// When overridden in a derived class, returns a <see cref="T:System.Windows.DataTemplate"/> based on custom logic.
/// </summary>
/// <returns>
/// Returns a <see cref="T:System.Windows.DataTemplate"/> or null. The default value is null.
/// </returns>
/// <param name="item">The data object for which to select the template.</param><param name="container">The data-bound object.</param>
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
ListBox listBox = null;
DependencyObject parent = container;
while (parent != null)
{
parent = VisualTreeHelper.GetParent(parent);
listBox = parent as ListBox;
if (listBox != null)
{
break;
}
}
if (listBox != null)
{
ColorGallery colorGallery = null;
while (parent != null)
{
parent = VisualTreeHelper.GetParent(parent);
colorGallery = parent as ColorGallery;
if (colorGallery != null)
{
break;
}
}
if (colorGallery != null)
{
int index = listBox.Items.IndexOf(item);
if (index < colorGallery.Columns)
{
return(listBox.TryFindResource("GradientColorTopDataTemplate") as DataTemplate);
}
else if (index >= listBox.Items.Count - colorGallery.Columns)
{
return(listBox.TryFindResource("GradientColorBottomDataTemplate") as DataTemplate);
}
else
{
return(listBox.TryFindResource("GradientColorCenterDataTemplate") as DataTemplate);
}
}
}
return(null);
}