按住按钮时执行操作，释放按钮时执行另一个操作

Question

我正在使用 visual studio 创建一个 Windows IoT 应用程序。在应用程序的 GUI 上有一个按钮，当通过单击鼠标或按下某个键来按住该按钮时，它会执行一个操作，在这种情况下，文本框会更改其文本，而电机是 运行。释放按钮时，文本框会更改其文本并且电机会停止。

我在 .xml 文件中创建了一个按钮，并在 .cs 中创建了 button_holding 事件，但这并没有执行任何操作。

Answer 1

你可以使用Holding事件来获得类似传统WinForms中的MouseUp和MouseDown，像这样

private void Button_Holding(object sender, HoldingRoutedEventArgs e)
        {
            if (e.HoldingState == Windows.UI.Input.HoldingState.Started)
            {
                //do things when button on hold
            }
            else if (e.HoldingState == Windows.UI.Input.HoldingState.Completed ||
                e.HoldingState == Windows.UI.Input.HoldingState.Canceled)
            {
                //do things when button release
            }
        }

Answer 2

On the GUI of the app there is a button that when held down with a mouse click or a key being pressed it performs an action, in this case a text box changes its text and a motor is run. When the button is released the text box changes its text and the motor is stopped.

可以使用PointerPressedEvent和PointerReleasedEvent来实现。这是适合我的代码：

public MainPage()
{
    this.InitializeComponent();
    myButton.AddHandler(PointerPressedEvent, new PointerEventHandler(myButton_PointerPressed), true);
    myButton.AddHandler(PointerReleasedEvent, new PointerEventHandler(myButton_PointerReleased), true);
}

private void myButton_PointerPressed(object sender, PointerRoutedEventArgs e)
{
    myText.Text = "Running...";
}

private void myButton_PointerReleased(object sender, PointerRoutedEventArgs e)
{
    myText.Text = "Stopped";
}