protected virtual void UpdateFlyoutHeader()
{
_ = Element ?? throw new InvalidOperationException($"{nameof(Element)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
if (_headerView != null)
{
_headerView.MeasureInvalidated -= OnHeaderSizeChanged;
_headerView = null;
}
_headerView = (Element as IShellController).FlyoutHeader;
_headerBehavior = Element.FlyoutHeaderBehavior;
BuildMenu();
if (_headerView != null)
{
if (HeaderOnMenu)
{
_navigationView.Header = null;
}
else
{
_navigationView.Header = _headerView.ToPlatform(MauiContext);
_headerView.MeasureInvalidated += OnHeaderSizeChanged;
}
}
else
{
_navigationView.Header = null;
}
}
public static Shell FlyoutHeader(this Shell shell, object header, DataTemplate template,
FlyoutHeaderBehavior behavior = Xamarin.Forms.FlyoutHeaderBehavior.Default)
{
shell.FlyoutHeader = header;
shell.FlyoutHeaderTemplate = template;
shell.FlyoutHeaderBehavior = behavior;
return(shell);
}
internal void SetFlyoutHeaderBehavior(FlyoutHeaderBehavior flyoutHeaderBehavior)
{
if (_flyoutHeaderBehavior == flyoutHeaderBehavior)
{
return;
}
_flyoutHeaderBehavior = flyoutHeaderBehavior;
UpdateMinimumHeight();
}
public async Task FlyoutHeaderContentAndFooterAllMeasureCorrectly(FlyoutHeaderBehavior behavior)
{
await RunShellTest(shell =>
{
shell.FlyoutHeader = new Label()
{
Text = "Flyout Header"
};
shell.FlyoutFooter = new Label()
{
Text = "Flyout Footer"
};
shell.FlyoutContent = new VerticalStackLayout()
{
new Label()
{
Text = "Flyout Content"
}
};
shell.FlyoutHeaderBehavior = behavior;
},
async (shell, handler) =>
{
await OpenFlyout(handler);
var flyoutFrame = GetFlyoutFrame(handler);
var headerFrame = GetFrameRelativeToFlyout(handler, (IView)shell.FlyoutHeader);
var contentFrame = GetFrameRelativeToFlyout(handler, (IView)shell.FlyoutContent);
var footerFrame = GetFrameRelativeToFlyout(handler, (IView)shell.FlyoutFooter);
// validate header position
AssertionExtensions.CloseEnough(0, headerFrame.X, message: "Header X");
AssertionExtensions.CloseEnough(0, headerFrame.Y, message: "Header Y");
AssertionExtensions.CloseEnough(flyoutFrame.Width, headerFrame.Width, message: "Header Width");
// validate content position
AssertionExtensions.CloseEnough(0, contentFrame.X, message: "Content X");
AssertionExtensions.CloseEnough(headerFrame.Height, contentFrame.Y, epsilon: 0.5, message: "Content Y");
AssertionExtensions.CloseEnough(flyoutFrame.Width, contentFrame.Width, message: "Content Width");
// validate footer position
AssertionExtensions.CloseEnough(0, footerFrame.X, message: "Footer X");
AssertionExtensions.CloseEnough(headerFrame.Height + contentFrame.Height, footerFrame.Y, epsilon: 0.5, message: "Footer Y");
AssertionExtensions.CloseEnough(flyoutFrame.Width, footerFrame.Width, message: "Footer Width");
//All three views should measure to the height of the flyout
AssertionExtensions.CloseEnough(headerFrame.Height + contentFrame.Height + footerFrame.Height, flyoutFrame.Height, epsilon: 0.5, message: "Total Height");
});
}
public async Task FlyoutHeaderMinimumHeight(FlyoutHeaderBehavior behavior)
{
await RunShellTest(shell =>
{
var layout = new VerticalStackLayout()
{
new Label()
{
Text = "Flyout Header"
}
};
shell.FlyoutHeader = layout;
shell.FlyoutHeaderBehavior = behavior;
},
async (shell, handler) =>
{
await OpenFlyout(handler);
var flyoutFrame = GetFrameRelativeToFlyout(handler, shell.FlyoutHeader as IView);
if (behavior == FlyoutHeaderBehavior.CollapseOnScroll)
{
// 56 was pulled from the ActionBar height on Android
// and then just used across all three platforms for
// the min height when using collapse on scroll
AssertionExtensions.CloseEnough(56, flyoutFrame.Height);
}
else
{
AssertionExtensions.AssertWithMessage(() =>
Assert.True(flyoutFrame.Height < 56),
$"Expected < 56 Actual: {flyoutFrame.Height}"
);
}
});
}
public static T FlyoutHeaderBehavior <T>(this T shell, FlyoutHeaderBehavior flyoutHeaderBehavior) where T : IRxShell
{
shell.FlyoutHeaderBehavior = flyoutHeaderBehavior;
return(shell);
}
public static Shell FlyoutHeaderBehavior(this Shell shell, FlyoutHeaderBehavior behavior)
{
shell.FlyoutHeaderBehavior = behavior;
return(shell);
}
