private static void DetachFrameEvents(NavButtonBehavior behavior, Frame frame)
{
if (behavior == null || frame == null)
{
return;
}
if (!behavior._eventRegistrationInfo.TryGetValue(frame, out var eventReg))
{
// events already detached
return;
}
behavior._eventRegistrationInfo.Remove(frame);
frame.UnregisterPropertyChangedCallback(Frame.CanGoBackProperty, eventReg.GoBackReg);
frame.UnregisterPropertyChangedCallback(Frame.CanGoForwardProperty, eventReg.GoForwardReg);
frame.Navigated -= behavior.OnNavigated;
frame.Loaded -= behavior.FrameOnLoaded;
}
private static void AttachFrameEvents(NavButtonBehavior behavior, Frame frame)
{
if (behavior == null || frame == null)
{
return;
}
if (behavior._eventRegistrationInfo.TryGetValue(frame, out var eventReg))
{
// events already attached
return;
}
eventReg = new FrameEventRegistration();
behavior._eventRegistrationInfo.Add(frame, eventReg);
eventReg.GoBackReg = frame.RegisterPropertyChangedCallback(Frame.CanGoBackProperty, (s, e) => behavior.CalculateThrottled());
eventReg.GoForwardReg = frame.RegisterPropertyChangedCallback(Frame.CanGoForwardProperty, (s, e) => behavior.CalculateThrottled());
frame.Navigated += behavior.OnNavigated;
frame.Loaded += behavior.FrameOnLoaded;
}
private static void DetachFrameEvents(NavButtonBehavior behavior, Frame frame)
{
if (behavior == null || frame == null)
{
return;
}
FrameEventRegistration eventReg;
if (!behavior._eventRegistrationInfo.TryGetValue(frame, out eventReg))
{
// events already detached
return;
}
behavior._eventRegistrationInfo.Remove(frame);
frame.UnregisterPropertyChangedCallback(Frame.CanGoBackProperty, eventReg.GoBackReg);
frame.UnregisterPropertyChangedCallback(Frame.CanGoForwardProperty, eventReg.GoForwardReg);
frame.Navigated -= behavior.OnNavigated;
frame.Loaded -= behavior.FrameOnLoaded;
}
private static void AttachFrameEvents(NavButtonBehavior behavior, Frame frame)
{
if (behavior == null || frame == null)
{
return;
}
FrameEventRegistration eventReg;
if (behavior._eventRegistrationInfo.TryGetValue(frame, out eventReg))
{
// events already attached
return;
}
eventReg = new FrameEventRegistration();
behavior._eventRegistrationInfo.Add(frame, eventReg);
eventReg.GoBackReg = frame.RegisterPropertyChangedCallback(Frame.CanGoBackProperty, (s, e) => behavior.CalculateThrottled());
eventReg.GoForwardReg = frame.RegisterPropertyChangedCallback(Frame.CanGoForwardProperty, (s, e) => behavior.CalculateThrottled());
frame.Navigated += behavior.OnNavigated;
frame.Loaded += behavior.FrameOnLoaded;
}
