/// <summary>
/// Adds a handler for the specific visibility event
/// </summary>
/// <param name="visibilityEvent">The event to add a handler for</param>
/// <param name="window">The window to add the handler for</param>
/// <param name="handler">The handler</param>
/// <returns>The WinRT handler</returns>
private static WinRTVisibilityHandler AddVisibilityHandler(EventInfo visibilityEvent, Window window, TouchKeyboardVisibilityHandler handler)
{
IInputPane2 inputPane = GetInputPane(window);
// This adds the event handler to the visibility event
Func <WinRTVisibilityHandler, EventRegistrationToken> add =
(addHandler) =>
{
return((EventRegistrationToken)visibilityEvent.AddMethod.Invoke(inputPane, new object[] { addHandler }));
};
// This removes the handler from the visibility event
Action <EventRegistrationToken> remove =
(removeHandler) =>
{
visibilityEvent.RemoveMethod.Invoke(inputPane, new object[] { removeHandler });
};
// This is the WinRT called handler to translate to the local WPF delegate
WinRTVisibilityHandler localHandler =
(inputPaneInstance, visArgs) =>
{
// We cannot reference System.Runtime.WindowsRuntime directly, so only access the Rect type via
// reflection to ensure the proper assembly loads with no issues.
var rect = visArgs.GetType().GetProperty("OccludedRect").GetValue(visArgs);
// Invoke the WPF specific handler to pass the occluded rectangle information
handler?.Invoke(
window,
new System.Windows.Rect(
(double)rect.GetType().GetRuntimeProperty("X").GetValue(rect),
(double)rect.GetType().GetRuntimeProperty("Y").GetValue(rect),
(double)rect.GetType().GetRuntimeProperty("Width").GetValue(rect),
(double)rect.GetType().GetRuntimeProperty("Height").GetValue(rect)));
};
// Add the event handlers
WindowsRuntimeMarshal.AddEventHandler <WinRTVisibilityHandler>(add, remove, localHandler);
// Return the WinRT handler in order to use it to un-register later
return(localHandler);
}
/// <summary>
/// Removes a handler for the specific visibility event
/// </summary>
/// <param name="visibilityEvent">The event to remove the handler for</param>
/// <param name="window">The window to remove the handler for</param>
/// <param name="winRtHandler">The WinRT handler</param>
private static void RemoveVisibilityHandler(EventInfo visibilityEvent, Window window, WinRTVisibilityHandler winRtHandler)
{
IInputPane2 inputPane = GetInputPane(window);
Action<EventRegistrationToken> remove =
(removeHandler) =>
{
visibilityEvent.RemoveMethod.Invoke(inputPane, new object[] { removeHandler });
};
WindowsRuntimeMarshal.RemoveEventHandler<WinRTVisibilityHandler>(remove, winRtHandler);
}
/// <summary>
/// Removes a handler for the specific visibility event
/// </summary>
/// <param name="visibilityEvent">The event to remove the handler for</param>
/// <param name="window">The window to remove the handler for</param>
/// <param name="winRtHandler">The WinRT handler</param>
private static void RemoveVisibilityHandler(EventInfo visibilityEvent, Window window, WinRTVisibilityHandler winRtHandler)
{
IInputPane2 inputPane = GetInputPane(window);
Action <EventRegistrationToken> remove =
(removeHandler) =>
{
visibilityEvent.RemoveMethod.Invoke(inputPane, new object[] { removeHandler });
};
WindowsRuntimeMarshal.RemoveEventHandler <WinRTVisibilityHandler>(remove, winRtHandler);
}
