如何在Windows应用商店应用中创建键盘快捷键（如Ctrl + C）

debugcn 发表于 Dev

非常

我想在我的应用程序中创建键盘快捷键，例如用于复制的Ctrl+ C。另外，如果TextBox具有焦点，我也想忽略该快捷方式。

非常

首先，您需要一种方法来检查是否按下了控制键。CoreWindow.GetKeyState可以完成这项工作，但使用起来可能有些棘手，所以我创建了一个帮助器类：

public class ModifierKeys
{
    #region ShiftIsDown property

    public static bool ShiftIsDown 
    { 
        get
        {
            return (Window.Current.CoreWindow.GetKeyState(VirtualKey.Shift) & CoreVirtualKeyStates.Down) != 0;
        }
    }

    public static bool OnlyShiftIsDown 
    { 
        get
        {
            return ShiftIsDown && !AltIsDown && !ControlIsDown;
        }
    }

    #endregion

    #region AltIsDown property

    public static bool AltIsDown
    {
        get
        {
            return (Window.Current.CoreWindow.GetKeyState(VirtualKey.Menu) & CoreVirtualKeyStates.Down) != 0;
        }
    }

    public static bool OnlyAltIsDown
    {
        get
        {
            return !ShiftIsDown && AltIsDown && !ControlIsDown;
        }
    }

    #endregion

    #region ControlIsDown property

    public static bool ControlIsDown
    {
        get
        {
            return (Window.Current.CoreWindow.GetKeyState(VirtualKey.Control) & CoreVirtualKeyStates.Down) != 0;
        }

    }

    public static bool OnlyControlIsDown
    {
        get
        {
            return !ShiftIsDown && !AltIsDown && ControlIsDown;
        }
    }

    #endregion

    #region NoModifierKeyIsDown property

    public static bool NoModifierKeyIsDown
    {
        get
        {
            return !ShiftIsDown && !AltIsDown && !ControlIsDown;
        }
    }

    #endregion
}

现在，OnNavigateTo/From在页面中，订阅/取消订阅按键事件：

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        /*...*/
        Window.Current.CoreWindow.KeyDown += CoreWindow_KeyDown;
    }

    protected override void OnNavigatedFrom(NavigationEventArgs e)
    {
        /*...*/
        Window.Current.CoreWindow.KeyDown -= CoreWindow_KeyDown;
    }

该CoreWindow_KeyDown项目就会看起来是这样的：

void CoreWindow_KeyDown(CoreWindow sender, KeyEventArgs args)
{
    var focusedElement = FocusManager.GetFocusedElement();

    if (args.KeyStatus.WasKeyDown == false && ModifierKeys.OnlyControlIsDown &&
        !(focusedElement is TextBox)
        )
    {
            if (args.VirtualKey == VirtualKey.X)
            {
                /*...cut...*/
            }
            else if (args.VirtualKey == VirtualKey.V)
            {
                /*...paste...*/
            }
            else if (args.VirtualKey == VirtualKey.C)
            {
                /*...copy...*/
            }
    }
}