问题
i have button in my windows phone silverlight 8.1 app i created two event one click event and second hold event, i want when user hold such button then click event should not fire, but currently when i hold button and then leave that button click button also fires, so how to handle that.
private void ExtraButton_Click(object sender, RoutedEventArgs e)
{
}
private void ExtraButton_Hold(object sender, GestureEventArgs e)
{
}
so how to cancel click event when hold event performed.
回答1:
I suggest you can replace the Button Click event with Button Tap event, because when you hold this button, the Button Hold event will be triggered firstly.
private void button1_Hold(object sender, System.Windows.Input.GestureEventArgs e)
{
e.Handled = true;
MessageBox.Show("button have been holded");
}
private void button1_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
MessageBox.Show("button have been tapped");
//your code goes here
}
After you set Handled property as true, then the Button Click event will not handle your gesture.
回答2:
You can achieve your requirement by unwire the button click event while holding and again wire the click event in PointerExited event. Refer the below code snippet.
Button btn = new Button();
btn.Holding += Btn_Holding;
btn.Click += Btn_Click;
btn.PointerExited += Btn_PointerExited;
private void Btn_PointerExited(object sender, PointerRoutedEventArgs e)
{
btn.Click += Btn_Click;
}
private void Btn_Click(object sender, RoutedEventArgs e)
{
}
private void Btn_Holding(object sender, HoldingRoutedEventArgs e)
{
btn.Click -= Btn_Click;
}
In PointerExited event, you can hook the click event only if it is not already hooked using some conditions. It will improve the performance.
回答3:
Use Button_Hold and Button_Tap events to achieve your requirement.
来源：https://stackoverflow.com/questions/41074596/click-event-should-not-trigger-when-hold-event-perform