CODEWITHSUNDEEP
c#xamluwpdispatchertimer
luddep
luddep

Reputation: 249

DispatcherTimer stacking - UWP

I'm currently working on a project in UWP and I have a CommandBar that I want to go from Hidden to Compact if the mouse moves. After five seconds (If the mouse dont move) the CommandBar should go back to Hidden again.

I dont get any errors, but when I move the mouse the CommandBar is going crazy and it's just flashing from Hidden to Compact when I move the mouse again. I think the problem is that the OnMouseMovement event is stacking upon itself.

This is my code for the mouse movement event: 

public async void OnPointerMoved(object Sender, PointerRoutedEventArgs e)
{
    CmdBar.ClosedDisplayMode = AppBarClosedDisplayMode.Compact;
    DispatcherTimer ButtonTimer = new DispatcherTimer();
    ButtonTimer.Interval = TimeSpan.FromSeconds(5);
    ButtonTimer.Tick += (sender, args) =>
    {
        CmdBar.ClosedDisplayMode = AppBarClosedDisplayMode.Hidden;
    };
    ButtonTimer.Start();
}

Upvotes: 2

Views: 267

Answers (1)

Antoine Thiry
Antoine Thiry

Reputation: 2442

I made a little test project to try it out and get you an answer, this is what I did : 

private DispatcherTimer Timer { get; set; }
public MainPage()
{
    this.InitializeComponent();
    CmdBar.ClosedDisplayMode = AppBarClosedDisplayMode.Hidden;            
    Timer = new DispatcherTimer(){Interval = TimeSpan.FromSeconds(5) };
    Timer.Tick += (sender, args) => { 
        CmdBar.ClosedDisplayMode = AppBarClosedDisplayMode.Hidden; 
        Timer.Stop();
    };

}

public async void OnPointerMoved(object Sender, PointerRoutedEventArgs e)
{
    Timer.Stop();
    CmdBar.ClosedDisplayMode = AppBarClosedDisplayMode.Compact;
    Timer.Start();            
}

Basically as @Evk said, you are creating a new timer every move of your mouse. So I declared a property for the timer and stop it then restart it when your mouse move.

Upvotes: 3

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