Define custom page types to be ignored about sentry-xamarin

[lucas-zimerman]

Hi, Thanks for opening this issue.
In your case, would you prefer to have an option that allows the SDK to disable the navigation breadcrumbs and you implement it on your side, or that we give you a callback where you decide what to ignore on the Appearing event?

[Hackmodford]

Disabling would be good too. I thought about having the ignore list, but I have some other custom navigation stuff that would be neat to add.

[bruno-garcia]

You could also use BeforeBreadcrumb to remove those programatically

[bruno-garcia]

So we agreed to resolve this we can add an extension method RemoveNavigationPageIntegration.

[Hackmodford]

I'm going to experiment with BeforeBreadcrumb

[Hackmodford]

Here's my workaround using BeforeBreadcrumb

options.BeforeBreadcrumb = breadcrumb =>
{
    var output = AlwaysIgnorePage(breadcrumb, "LoadingOverlayPage");
    output = IgnoreNavigationPage(output, "CustomNavigationPage");
    return output;
};

private static Breadcrumb? AlwaysIgnorePage(Breadcrumb? breadcrumb, string pageName)
{
    // not the breadcrumb we're interested in
    if (breadcrumb is null) return breadcrumb;
    if (breadcrumb.Type is null) return breadcrumb;
    if (breadcrumb.Type != "navigation") return breadcrumb;
    if (breadcrumb.Data is null) return breadcrumb;

    return breadcrumb.Data["to"].Contains(pageName) ? null : breadcrumb;
}

private static string? _lastPageName;

private static Breadcrumb? IgnoreNavigationPage(Breadcrumb? breadcrumb, string pageName)
{
    // not the breadcrumb we're interested in
    if (breadcrumb is null) return breadcrumb;
    if (breadcrumb.Type is null) return breadcrumb;
    if (breadcrumb.Type != "navigation") return breadcrumb;
    if (breadcrumb.Data is null) return breadcrumb;

    if (breadcrumb.Data["to"].Contains(pageName))
    {
        _lastPageName = breadcrumb.Data["from"];
        return null;
    }

    if (_lastPageName is null) return null;

    var data = new Dictionary<string, string>()
    {
        { "from", _lastPageName },
        { "to", breadcrumb.Data["to"] }
    };

    var replacementBreadcrumb = new Breadcrumb(
        breadcrumb.Message!,
        breadcrumb.Type, data,
        breadcrumb.Category,
        breadcrumb.Level);

    _lastPageName = breadcrumb.Data["to"];

    return replacementBreadcrumb;
}