Notice (2018-05-24): bugzilla.xamarin.com is now in
Please join us on
Visual Studio Developer Community and in the
Mono organizations on
GitHub to continue tracking issues. Bugzilla will remain
available for reference in read-only mode. We will continue to work
on open Bugzilla bugs, copy them to the new locations
as needed for follow-up, and add the new items under Related
Our sincere thanks to everyone who has contributed on this bug
tracker over the years. Thanks also for your understanding as we
make these adjustments and improvements for the future.
Please create a new report on
Developer Community or GitHub with
your current version information, steps to reproduce, and relevant error
messages or log files if you are hitting an issue that looks similar to
this resolved bug and you do not yet see a matching new report.
With a template used for a ListView's header and footer, if the template defines a MinimumHeightRequest on the content (in the example below, this is a Label), the MinimumHeightRequest is ignored. In the code below, MinimumHeightRequest is set to 144, but this is ignored and the actual Height is much less than 144.
Even if the Label is wrapped in a ContentView, StackLayout or Grid, with the wrapper having MinimumHeightRequest set to 144 and AndExpands on the VerticalOptions, the ListView's header or footer still does not use the minimum height specified.
public class MyAppMenuHeaderFooterTemplate : DataTemplate
object commandParameter) : base(() =>
Label label = new Label
HorizontalOptions = LayoutOptions.Center,
VerticalOptions = LayoutOptions.StartAndExpand,
VerticalTextAlignment = TextAlignment.Center,
MinimumHeightRequest = 144,
LineBreakMode = LineBreakMode.WordWrap,
FontSize = Device.GetNamedSize(NamedSize.Small, typeof(Label))
} // public class MyAppMenuHeaderFooterTemplate : DataTemplate
} // namespace ViewsUsingXamarinForms
Minimum height/width request seems to be ignored by all elements. I was working on it last night. Found a fix but it broke many unit tests. They need to fix this at the level of VisualElement & Layout.
Should have mentioned, I am using XF 18.104.22.168
While we wish Minimum Width/Height worked differently, such a change now would be a large breaking change to many users and as such will not be fixed.
If MinimumHeightRequest and MinimumWidthRequest are going to be intentionally ignored, can they both be marked as Obsolete please, with an appropriate message to explain that they simply don't do what any developer would expect?
I would honestly prefer a breaking change that results in properly-working software over leaving bugs in the system forever. It's a great relief for maintenance programmers to finally be able to delete all the yucky work-around code that compensates for bugs like this.
One way or another something has to change - either obsoleting the broken properties, creating new ones that work, or fixing the bugs.
The least disruptive path is to create new working properties, but the broken ones have already captured the best names for them. So my vote (probably doesn't count for much, but here goes anyway) is for fixing the bugs.
David/Jason - I agree completely. For this particular bug, I would not have an issue with it being a breaking change. The properties are well named, so if people have written code that would break by them suddenly working the way their names suggest, then those developers should (a) be in a minority, and (b) be prepared to fix their own code that uses these properties.
However, if Xamarin are not going to fix this, the next best thing (ok, the least worst thing as it's still not good) is to mark these properties obsolete.