/// <summary>
/// Retrieves the mapping collection
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static InputBinderCollection GetMappings(DependencyObject obj)
{
var map = obj.GetValue(MappingsProperty) as InputBinderCollection;
if (map == null)
{
map = new InputBinderCollection();
SetMappings(obj, map);
}
return(map);
}
/// <summary>
/// This changes the event mapping
/// </summary>
/// <param name="target"></param>
/// <param name="e"></param>
private static void OnMappingsChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
{
if (Designer.InDesignMode)
{
return;
}
var sender = target as Page;
if (sender != null)
{
_activePage = sender;
_activePage.Unloaded += SenderOnUnloaded;
if (e.NewValue != null)
{
Window.Current.Dispatcher.AcceleratorKeyActivated += DispatcherOnAcceleratorKeyActivated;
Window.Current.CoreWindow.Activated += CoreWindowOnActivated;
InputBinderCollection bindingCollection = (InputBinderCollection)e.NewValue;
// Forward the data context so bindings work properly.
foreach (var entry in bindingCollection)
{
entry.SetBinding(FrameworkElement.DataContextProperty,
new Binding {
Source = _activePage, Path = new PropertyPath("DataContext")
});
}
bindingCollection.CollectionChanged += OnForwardDataContext;
}
else
{
Window.Current.Dispatcher.AcceleratorKeyActivated -= DispatcherOnAcceleratorKeyActivated;
Window.Current.CoreWindow.Activated -= CoreWindowOnActivated;
ActiveKeys.Clear();
}
if (e.OldValue != null)
{
InputBinderCollection bindingCollection = (InputBinderCollection)e.OldValue;
bindingCollection.CollectionChanged -= OnForwardDataContext;
}
}
}
/// <summary>
/// Checks for any input binding match in the current keyboard state.
/// If we find one, run the associated command.
/// </summary>
private static void CheckForActiveKey()
{
if (_activePage == null || ActiveKeys.Count == 0)
{
return;
}
InputBinderCollection bindingCollection = GetMappings(_activePage);
if (bindingCollection == null || bindingCollection.Count == 0)
{
return;
}
foreach (var binding in bindingCollection)
{
if (binding.CheckKey(ActiveKeys))
{
// If the currently active element is some form of TextBox, then
// shift focus so that any data bound information is transferred properly
Control currentFocusedControl = FocusManager.GetFocusedElement() as Control;
if (currentFocusedControl is TextBox ||
currentFocusedControl is RichEditBox ||
currentFocusedControl is PasswordBox)
{
Frame frameOwner = Window.Current.Content as Frame;
if (frameOwner != null)
{
if (frameOwner.Focus(FocusState.Programmatic))
{
currentFocusedControl.Focus(FocusState.Programmatic);
}
}
}
ICommand command = binding.Command;
if (command != null && command.CanExecute(binding.CommandParameter))
{
command.Execute(binding.CommandParameter);
}
}
}
}
/// <summary>
/// This sets the mapping collection.
/// </summary>
/// <param name="obj">Dependency Object</param>
/// <param name="value">Mapping collection</param>
public static void SetMappings(DependencyObject obj, InputBinderCollection value)
{
obj.SetValue(MappingsProperty, value);
}
