public override void OnApplyTemplate()
{
base.OnApplyTemplate();
buttonExpand = (ToggleButton)GetTemplateChild("buttonExpand");
button = (Button)GetTemplateChild("button");
menu = (ContextMenu)GetTemplateChild("menu");
if (menu != null)
{
menu.DataContext = DataContext;
menu.Opened += menu_Opened;
BreadcrumbItem templatedParent = TemplatedParent as BreadcrumbItem;
if (templatedParent != null && templatedParent.Items.Count > 0)
{
DataTemplateSelector selector = VisualTreHelperEx.GetDefaultSelector();
DataTemplate template = selector.SelectTemplate(templatedParent.Items[0], this);
menu.ItemTemplate = template;
}
menu.CommandBindings.Add(new CommandBinding(InvokeMenuCommand, CommandBindingToMenuItem_Executed));
}
DependencyPropertyDescriptor isPressedProperty = DependencyPropertyDescriptor.FromProperty(IsPressedProperty, typeof(Button));
isPressedProperty.AddValueChanged(button, OnIsPressedChangedIntern);
}
private void CommandBindingToButton_Executed(object sender, ExecutedRoutedEventArgs e)
{
FrameworkElement itemsControl = DataContext as FrameworkElement;
if (itemsControl != null)
{
Breadcrumb parent = VisualTreHelperEx.FindVisualParent <Breadcrumb>(this);
object target = itemsControl.DataContext;
if (target == null)
{
target = itemsControl;
}
parent.GoTo(target);
}
}
private void CommandBindingToMenuItem_Executed(object sender, ExecutedRoutedEventArgs e)
{
var breadcrumb = VisualTreHelperEx.FindVisualParent <Breadcrumb>(this);
breadcrumb.AddTrail(ParentItem, e.Parameter);
}
void menu_Opened(object sender, RoutedEventArgs e)
{
BreadcrumbView view = View;
BreadcrumbItem templatedParent = TemplatedParent as BreadcrumbItem;
menu.Placement = PlacementMode.Relative;
menu.PlacementTarget = buttonExpand;
menu.VerticalOffset = buttonExpand.ActualHeight;
menu.HorizontalOffset = buttonExpand.ActualWidth + menu.BorderThickness.Left;
if ((templatedParent != null) && templatedParent.IsFirst)
{
Image image = VisualTreHelperEx.FindVisualChild <Image>(templatedParent);
if (image != null)
{
menu.HorizontalOffset -= image.ActualWidth;
}
}
if (view != null)
{
int index = view.ItemContainerGenerator.IndexFromContainer(TemplatedParent);
if (index >= 0)
{
menu.UpdateLayout();
TextBlock menuText = VisualTreHelperEx.FindVisualChild <TextBlock>(menu);
if (menuText != null)
{
double menuTextOffset = menuText.TransformToVisual(menu).Transform(new Point(0, 0)).X;
TextBlock buttonText = VisualTreHelperEx.FindVisualChild <TextBlock>(button);
if (buttonText != null)
{
double buttonTextOffset = buttonText.TransformToVisual((Visual)TemplatedParent).Transform(new Point(0, 0)).X;
menu.HorizontalOffset -= (menuTextOffset - buttonTextOffset);
}
}
}
}
for (var index = 0; index < menu.Items.Count; index++)
{
object o = menu.Items[index];
MenuItem menuItem = menu.ItemContainerGenerator.ContainerFromIndex(index) as MenuItem;
if (menuItem != null)
{
FieldInfo rolePropertyKeyField = typeof(MenuItem).GetField("RolePropertyKey",
BindingFlags.NonPublic | BindingFlags.Static);
DependencyPropertyKey rolePropertyKey = (DependencyPropertyKey)rolePropertyKeyField.GetValue(menuItem);
menuItem.SetValue(rolePropertyKey, MenuItemRole.SubmenuItem);
BreadcrumbItem container = view.ItemContainerGenerator.ContainerFromIndex(index) as BreadcrumbItem;
if (container != null /*&& container.IsSelected*/)
{
menuItem.FontWeight = FontWeights.Bold;
}
else
{
menuItem.FontWeight = FontWeights.Normal;
}
}
}
}