트리에서 상속 된 첨부 된 읽기 전용 속성을 유지 관리하는 일부 '범위'요소 (예 : UserControl
)에 첨부 할 수있는 첨부 된 동작을 만들 수 있습니다. 그런 다음 첨부 된 속성에 Trigger
을 간단하게 추가 할 수 있습니다.
public sealed class AltShiftHotKeyBehavior : Behavior<FrameworkElement>
{
private const ModifierKeys AltShift = ModifierKeys.Alt | ModifierKeys.Shift;
private static readonly DependencyPropertyKey IsAltShiftPressedPropertyKey =
DependencyProperty.RegisterAttachedReadOnly(
"IsAltShiftPressed",
typeof(bool),
typeof(AltShiftHotKeyBehavior),
new FrameworkPropertyMetadata(
false,
FrameworkPropertyMetadataOptions.Inherits));
public static readonly DependencyProperty IsAltShiftPressedProperty =
IsAltShiftPressedPropertyKey.DependencyProperty;
public static bool GetIsAltShiftPressed(DependencyObject element)
{
return (bool)element.GetValue(IsAltShiftPressedProperty);
}
protected override void OnAttached()
{
base.OnAttached();
var element = this.AssociatedObject;
element.AddHandler(
FrameworkElement.LoadedEvent,
(RoutedEventHandler)OnLoaded,
handledEventsToo: true);
element.AddHandler(
FrameworkElement.UnloadedEvent,
(RoutedEventHandler)OnUnloaded,
handledEventsToo: true);
element.AddHandler(
UIElement.PreviewKeyDownEvent,
(KeyEventHandler)OnKey,
handledEventsToo: true);
element.AddHandler(
UIElement.PreviewKeyUpEvent,
(KeyEventHandler)OnKey,
handledEventsToo: true);
element.AddHandler(
UIElement.LostKeyboardFocusEvent,
(KeyboardFocusChangedEventHandler)OnLostKeyboardFocus,
handledEventsToo: true);
var window = element as Window;
if (window != null)
{
window.Activated += OnWindowActivated;
window.Deactivated += OnWindowDeactivated;
}
CheckToggledState();
}
protected override void OnDetaching()
{
ClearToggledState();
base.OnDetaching();
var element = this.AssociatedObject;
element.RemoveHandler(
FrameworkElement.LoadedEvent,
(RoutedEventHandler)OnLoaded);
element.RemoveHandler(
FrameworkElement.UnloadedEvent,
(RoutedEventHandler)OnUnloaded);
element.RemoveHandler(
UIElement.PreviewKeyDownEvent,
(KeyEventHandler)OnKey);
element.RemoveHandler(
UIElement.PreviewKeyUpEvent,
(KeyEventHandler)OnKey);
element.RemoveHandler(
UIElement.LostKeyboardFocusEvent,
(KeyboardFocusChangedEventHandler)OnLostKeyboardFocus);
var window = element as Window;
if (window != null)
{
window.Activated -= OnWindowActivated;
window.Deactivated -= OnWindowDeactivated;
}
}
private void CheckToggledState()
{
var element = this.AssociatedObject;
if (element.IsLoaded &&
element.IsKeyboardFocusWithin &&
Keyboard.PrimaryDevice.Modifiers == AltShift)
{
element.SetValue(IsAltShiftPressedPropertyKey, true);
}
else
{
element.ClearValue(IsAltShiftPressedPropertyKey);
}
}
private void ClearToggledState()
{
this.AssociatedObject.ClearValue(IsAltShiftPressedPropertyKey);
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
CheckToggledState();
}
private void OnUnloaded(object sender, RoutedEventArgs e)
{
ClearToggledState();
}
private void OnWindowActivated(object sender, EventArgs e)
{
CheckToggledState();
}
private void OnWindowDeactivated(object sender, EventArgs e)
{
ClearToggledState();
}
private void OnLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
CheckToggledState();
}
private void OnKey(object sender, KeyEventArgs e)
{
CheckToggledState();
}
}
해당 키를 캡처하려는 범위는 무엇입니까? 부모 창 전체에서, 키보드 포커스가'UserControl' 내에있을 때, 또는 무엇을해야합니까? –
두 번째 경우로 충분합니다. – elnigno