CODEWITHSUNDEEP
xamarinxamarin.forms
Jessica S
Jessica S

Reputation: 165

How to detect Y position of StackLayout

I am using mechanism to move Stacklayout with gestures. Is there another event that detects StackLayout's Y position change? Meaning that I would like to catch when the StackLayout position is being panned up or down.

   <StackLayout x:Name="bottomDrawer" BackgroundColor="Olive" AbsoluteLayout.LayoutBounds="0.5,1.00,0.9,0.04" AbsoluteLayout.LayoutFlags="All">
        <StackLayout.GestureRecognizers>
            <PanGestureRecognizer PanUpdated="PanGestureHandler" />
        </StackLayout.GestureRecognizers>
</StackLayout>

Upvotes: 1

Views: 208

Answers (1)

SushiHangover
SushiHangover

Reputation: 74209

There are PropertyChanging and PropertyChanged events on the BindableObject (which is a class within the StackLayout hierarchy).

So you could bind to change(s) on the Y, Height and/or LayoutBounds properties.

Example using events:

aStackLayoutObject.PropertyChanging += (sender, e) =>
{
    switch (e.PropertyName)
    {
        case "Y":
            Log.WriteLine($"{e.PropertyName} : {(sender as StackLayout).Y}");
            break;
        case "Height":
            Log.WriteLine($"{e.PropertyName} : {(sender as StackLayout).Height}");
            break;
        case "LayoutBounds":
            Log.WriteLine($"{e.PropertyName}";
            break;
};

aStackLayoutObject.PropertyChanged += (sender, e) =>
{
    switch (e.PropertyName)
    {
        case "Y":
            Log.WriteLine($"{e.PropertyName} : {(sender as StackLayout).Y}");
            break;
        case "Height":
            Log.WriteLine($"{e.PropertyName} : {(sender as StackLayout).Height}");
            break;
        case "LayoutBounds":
            Log.WriteLine($"{e.PropertyName}";
            break;
};

Upvotes: 1

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