public async Task TestPop(bool useMaui)
{
NavigationPage nav = new TestNavigationPage(useMaui);
Label child = new Label();
Page childRoot = new ContentPage {
Content = child
};
Label child2 = new Label();
Page childRoot2 = new ContentPage {
Content = child2
};
await nav.PushAsync(childRoot);
await nav.PushAsync(childRoot2);
bool fired = false;
nav.Popped += (sender, e) => fired = true;
var popped = await nav.PopAsync();
Assert.True(fired);
Assert.AreSame(childRoot, nav.CurrentPage);
Assert.AreEqual(childRoot2, popped);
await nav.PopAsync();
var last = await nav.PopAsync();
Assert.IsNull(last);
}
public async Task PopLifeCycle(bool useMaui)
{
ContentPage initialPage = new ContentPage();
ContentPage pushedPage = new ContentPage();
ContentPage rootPageFiresAppearingAfterPop = null;
ContentPage pageDisappeared = null;
NavigationPage nav = new TestNavigationPage(useMaui, initialPage);
_ = new Window(nav);
nav.SendAppearing();
initialPage.Appearing += (sender, _)
=> rootPageFiresAppearingAfterPop = (ContentPage)sender;
pushedPage.Disappearing += (sender, _)
=> pageDisappeared = (ContentPage)sender;
await nav.PushAsync(pushedPage);
Assert.IsNull(rootPageFiresAppearingAfterPop);
Assert.IsNull(pageDisappeared);
await nav.PopAsync();
Assert.AreEqual(initialPage, rootPageFiresAppearingAfterPop);
Assert.AreEqual(pushedPage, pageDisappeared);
}
public async Task CurrentPageNotNullPoppingRoot(bool useMaui)
{
var root = new ContentPage {
Title = "Root"
};
var navPage = new TestNavigationPage(useMaui, root);
var popped = await navPage.PopAsync();
Assert.That(popped, Is.Null);
Assert.That(navPage.CurrentPage, Is.SameAs(root));
}
public async Task NavigationPagePopPage(bool useMaui)
{
var firstPage = new LCPage();
var poppedPage = new LCPage();
NavigationPage navigationPage = new TestNavigationPage(useMaui, firstPage);
await navigationPage.PushAsync(poppedPage);
await navigationPage.PopAsync();
Assert.IsNotNull(poppedPage.NavigatingFromArgs);
Assert.AreEqual(poppedPage, firstPage.NavigatedToArgs.PreviousPage);
Assert.AreEqual(firstPage, poppedPage.NavigatedFromArgs.DestinationPage);
}
public async Task CurrentPageUpdatesOnPopBeforeAsyncCompletes()
{
var root = new ContentPage {
Title = "Root"
};
var navPage = new TestNavigationPage(true, root);
await navPage.PushAsync(new ContentPage());
var popped = navPage.PopAsync();
Assert.AreEqual(navPage.CurrentPage, root);
await popped;
Assert.AreEqual(navPage.CurrentPage, root);
}
public async Task ReleasesPoppedPage(bool useMaui)
{
var root = new ContentPage {
Title = "Root"
};
var navPage = new TestNavigationPage(useMaui, root);
var isFinalized = false;
await navPage.PushAsync(new PageWithFinalizer(() => isFinalized = true));
await navPage.PopAsync();
await Task.Delay(100);
GC.Collect();
GC.WaitForPendingFinalizers();
Assert.IsTrue(isFinalized);
}
