监听软键盘的显示/隐藏事件（Windows 8.1 RT，XAML）

Question

我如何知道我的应用程序或页面中的软键盘何时 shown/dismissed？

在 THIS 文章中找到了这个片段。但对 WP 8.1 RT 无效。我如何翻译它或获得类似的行为？

public class MyApplication
{
    public MyApplication()
    {
        // Grab the input pane for the main application window and attach
        // touch keyboard event handlers.
        Windows.Foundation.Application.InputPane.GetForCurrentView().Showing
            += new EventHandler(_OnInputPaneShowing);
        Windows.Foundation.Application.InputPane.GetForCurrentView().Hiding
            += new EventHandler(_OnInputPaneHiding);
    }

    private void _OnInputPaneShowing(object sender, IInputPaneVisibilityEventArgs eventArgs)
    {
        // If the size of this window is going to be too small, the app uses 
        // the Showing event to begin some element removal animations.
        if (eventArgs.OccludedRect.Top < 400)
        {
            _StartElementRemovalAnimations();

            // Don't use framework scroll- or visibility-related 
            // animations that might conflict with the app's logic.
            eventArgs.EnsuredFocusedElementInView = true;
        }
    }

    private void _OnInputPaneHiding(object sender, IInputPaneVisibilityEventArgs eventArgs)
    {
        if (_ResetToDefaultElements())
        {
            eventArgs.EnsuredFocusedElementInView = true;
        }
    }

    private void _StartElementRemovalAnimations()
    {
        // This function starts the process of removing elements 
        // and starting the animation.
    }

    private void _ResetToDefaultElements()
    {
        // This function resets the window's elements to their default state.
    }
}

Answer 1

您引用的文章适用于 Windows 运行时应用程序，但它有一个小错误。 InputPane is in Windows.UI.ViewManagement 不在 Windows.Foundation.Application。更改它，其余的应该可以正常工作。

我已经报告了文档错误，因此可以修复它。

Answer 2

找到答案，报名那些活动就够了：

protected override void OnNavigatedTo(NavigationEventArgs e)
{
        InputPane.GetForCurrentView().Showing += onKeyboardShowing;
        InputPane.GetForCurrentView().Hiding += onKeyboardHidding;
}

private void onKeyboardShowing(InputPane sender, InputPaneVisibilityEventArgs args)
{
    KeyboardVisible = true;
}

private void onKeyboardHidding(InputPane sender, InputPaneVisibilityEventArgs args)
{

    KeyboardVisible = false;
}