Xamarin.Forms 1.4.0.6336-pre1

Build native UIs for iOS, Android, and Windows Phone from a single, shared C# codebase

This is a prerelease version of Xamarin.Forms.
There is a newer version of this package available.
See the version list below for details.
Install-Package Xamarin.Forms -Version 1.4.0.6336-pre1
dotnet add package Xamarin.Forms --version 1.4.0.6336-pre1
paket add Xamarin.Forms --version 1.4.0.6336-pre1
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

## Important Notes ##

This is a feature release. As such unlike a patch version bump, the minor version bump indicates the inclusion of new APIs. There should be no breaking changes; however with all feature work, there is the potential for the inclusion of instability. Please help us beta test this release and let us know of any issues you run across.

## New API ##

### ScrollView ###

It is now possible to detect the current scroll offset of the ScrollView. These are readonly bindable properties.
```csharp
public double ScrollX { get; }
public double ScrollY { get; }
```

There are also methods which can be used to perform scrolling in the ScrollView.
```csharp
public Task ScrollToAsync (double x, double y, bool animated);
public Task ScrollToAsync (Element element, bool animated);
```
The `Element` passed to `ScrollToAsync` must be a descendant of the `ScrollView` but does not have to be a direct child.

Finally for those who do not wish to use bindings to observe scrolling, there is a `Scrolled` event that fires when `ScrollX` or `ScrollY` are updated.
```csharp
public event EventHandler<ScrolledEventArgs> Scrolled;

public class ScrolledEventArgs : EventArgs
{
   public double ScrollX { get; } = 0;
   public double ScrollY { get; } = 0;
}
```
Lastly ScrollView no longer uses any internal API to communicate between the frontend and the renderer. `IScrollViewController`, which is implemented explicitly on ScrollView can be used to trigger these and other events.

### ListView ###

**Separator Enhancements**
It is now possible to enable/disable separators for the ListView. This can be configured via the `SeparatorVisibility` property, which is bindable.
```csharp
public SeparatorVisibility SeparatorVisibility { get; set; } = SeparatorVisibility.Default;

public enum SeparatorVisibility {
   Default = 0,
   None = 1,
}
```
Currently there is no option for `Always` as not all platforms have separators as part of their UX. We are considering adding this in the future, however it would be an invented paradigm for Windows platforms.

It is now possible to apply a `Color` to the separator in ListView.
```csharp
public Color SeparatorColor { get; set; } = Color.Default;
```
The default value is `Color.Default` and will function unchanged from the 1.3.0 implementation if left untouched. RGBA values are supported. This function does nothing in `SeparatorVisibility` is set to `None`. Please note that setting either of these properties on Android after loading the `ListView` incurs a large performance penalty.

**Header/Footer**
`ListView` has also grown both a Header and a Footer. These are managed through a series of properties which enable everything from simple usage to more complex MVVM style usage. With Header/Footer the primary reason developers have in the past been forced to put ListViews inside of ScrollViews is finally dead! If you are still placing a ListView inside a ScrollView we strongly suggest you consider porting.
```csharp
public object Header { get; set; } = null;
public DataTemplate HeaderTemplate { get; set; } = null;
public object Footer { get; set; } = null;
public DataTemplate FooterTemplate { get; set; } = null;
```
It is important to note that Header or Footer may be set directly to a View and the Template properties left null. This will cause the Header/Footer to be directly consumed by the renderer. All of these properties are bindable.

**Pull To Refresh**
PullToRefresh has been enabled on all current target platforms for ListView. To enable PullToRefresh in your app simple set `IsPullToRefreshEnabled` to true and make sure you respond to the correct events. It is important to note that this is the "easy" version of this API, in the future a more complete API with a standalone View may be added.
```csharp
public event EventHandler Refreshing;

public bool IsPullToRefreshEnabled { get; set; } = false;
public bool IsRefreshing { get; set; } = false;
public ICommand RefreshCommand { get; set; } = null;

public void BeginRefresh ();
public void EndRefresh ();
```
When the user triggers a `PullToRefresh` the Command will be invoked and the `Refreshed` event emitted. `IsRefreshing` will be set to true. The `ICommand.CanExecute` property is respected. The user must either call `EndRefresh` or assign `IsRefreshing` to false in order to end the refresh state.

All control parameters for these features and more are exposed through the IListViewController interface, which is explicitly implemented on ListView. This will assist those wishing to modify how these features work in custom renderers.

The Windows Phone implementation of PullToRefresh is a custom implementation as there is no platform idiom for doing this. In the future if the Windows platform decided to add a method of doing PullToRefresh by default, we intend to port.

### Forms.Application ###

The `Application` class now exposes 4 new events for dealing with Modal navigation.
```csharp
public event EventHandler<ModalPushedEventArgs> ModalPushed;
public event EventHandler<ModalPoppedEventArgs> ModalPopped;
public event EventHandler<ModalPushingEventArgs> ModalPushing;
public event EventHandler<ModalPoppingEventArgs> ModalPopping;
```
The `ModalPoppingEventArgs` contains a `Cancel` property which if set to true will cancel the Pop event and cause the application to enter the background (the operating system is informed of the unhandled back event).

In order to implement this feature, all pre-Application methods of creating a Forms app have been updated to create a default `Application` which is set as the root pages `Parent`. It is possible this may cause issues in some edge cases, if you have any issues please file a bug report. It is suggested you update your app to the new LoadApplication initialization methodology if possible.

Application now has a method of manually forcing the `Properties` dictionary to be saved to the IsolatedFileStore. This is to allow users to save their properties when it makes sense for them rather than risk them not getting serialized out due to a crash/being killed by the OS.
```csharp
public Task SavePropertiesAsync ()
```

### OpenGLRenderer ###

On Android `OpenGLRenderer` has been renamed `OpenGLViewRenderer` for consistency.

### Layout ###
Layout now contains a `ILayoutController` class which has an `IReadOnlyList<Element>` which can be used to enumerate the children of a Layout regardless of the type of the Layout.

## Other Features ##

- WebView now correctly supports javascript out of the box on Windows Phone 8.0

## Bug Fixes ##

- [Bug 27063](https://bugzilla.xamarin.com/show_bug.cgi?id=27063) - Navigation not always returning to the proper page.
- [Bug 27225](https://bugzilla.xamarin.com/show_bug.cgi?id=27225) - Secondary ToolbarItems cause app to hang during PushAsync
- [Bug 27437](https://bugzilla.xamarin.com/show_bug.cgi?id=27437) - [iOS] Context menu error after deleting an item from a ListView using ContextActions
- [Bug 27096](https://bugzilla.xamarin.com/show_bug.cgi?id=27096) - EntryCell has different fontsize on Android
- [Bug 21317](https://bugzilla.xamarin.com/show_bug.cgi?id=21317) - Stepper control .IsEnabled doesn't work on Android
- [Bug 26338](https://bugzilla.xamarin.com/show_bug.cgi?id=26338) - Unable to change page BackgroundImage from code
- [Bug 26588](https://bugzilla.xamarin.com/show_bug.cgi?id=26588) - [WinPhone] Entry does not trigger numeric keyboard when password masking is enabled


## Other Fixes ##

- Stepper default values now can be correctly inherited through a style.
- x:Static now correctly reports position on error in XAML.
- XAML now throws a more user friendly error on duplicate x:Name
- XAML will now use implicit operators when assigning values to properties
- XAML now supports baseclass indication for collection properties
- XAML string literals are now supported with `{}foo`
- iOS6 Modal pages should no longer sometimes have a 20px offset for no reason

Version History

Version Downloads Last updated
4.0.0.250467-pre7 866 3/20/2019
4.0.0.232914-pre6 2,251 3/14/2019
4.0.0.169046-pre5 4,535 2/21/2019
4.0.0.135214-pre4 3,480 2/6/2019
4.0.0.94569-pre3 3,563 1/24/2019
4.0.0.62955-pre2 10,572 1/10/2019
4.0.0.8055-pre1 10,736 12/4/2018
3.6.0.264807 11,785 3/19/2019
3.6.0.220655 35,392 3/6/2019
3.6.0.169048-pre2 346 2/21/2019
3.6.0.135200-pre1 3,239 2/6/2019
3.5.0.169047 39,377 2/20/2019
3.5.0.129452 52,946 2/6/2019
3.5.0.94564-pre3 675 1/24/2019
3.5.0.62956-pre2 699 1/10/2019
3.4.0.1029999 51,829 1/24/2019
3.4.0.1009999 65,062 1/4/2019
3.4.0.1008975 266,653 11/15/2018
3.4.0.987044-pre2 2,117 11/8/2018
3.4.0.925479-pre1 7,831 10/18/2018
3.3.0.967583 129,055 11/1/2018
3.3.0.912540 88,889 10/18/2018
3.3.0.893527-pre3 5,033 10/11/2018
3.3.0.871608-pre2 8,059 10/1/2018
3.3.0.840541-pre1 4,093 9/20/2018
3.2.0.871581 78,266 10/3/2018
3.2.0.839982 97,961 9/17/2018
3.2.0.809874-pre3 3,227 9/10/2018
3.2.0.729530-pre2 9,721 8/14/2018
3.2.0.637442-pre1 8,094 7/17/2018
3.1.0.697729 280,981 8/1/2018
3.1.0.637273 88,103 7/11/2018
3.1.0.583944 120,815 6/20/2018
3.1.0.561732-pre4 5,691 6/11/2018
3.1.0.550168-pre3 2,732 6/6/2018
3.1.0.530888-pre2 1,631 6/4/2018
3.1.0.469394-pre1 10,755 5/9/2018
3.0.0.561731 133,051 6/11/2018
3.0.0.550146 24,773 6/6/2018
3.0.0.530893 18,921 6/4/2018
3.0.0.482510 201,409 5/14/2018
3.0.0.446417 111,621 5/1/2018
3.0.0.427558-pre4 8,381 4/25/2018
3.0.0.354232-pre3 13,132 4/5/2018
3.0.0.296286-pre2 7,914 3/20/2018
2.5.1.527436 72,635 5/4/2018
2.5.1.444934 149,809 4/4/2018
2.5.1.392594-pre3 3,995 3/21/2018
2.5.1.340284-pre2 5,711 3/9/2018
2.5.1.317207-pre1 5,466 3/1/2018
2.5.0.280555 294,825 2/16/2018
2.5.0.122203 299,461 12/18/2017
2.5.0.121934 191,079 11/28/2017
2.5.0.91635 122,939 11/16/2017
2.5.0.77107 27,581 11/13/2017
2.5.0.75255-pre3 5,240 11/10/2017
2.5.0.19271-pre2 8,865 10/20/2017
2.4.0.91020 42,895 11/16/2017
2.4.0.74863 33,507 11/10/2017
2.4.0.38779 57,877 10/30/2017
2.4.0.18342 53,574 10/20/2017
2.4.0.282 154,675 9/29/2017
2.4.0.280 179,096 9/27/2017
2.4.0.275-pre3 7,878 9/19/2017
2.4.0.269-pre2 13,324 8/29/2017
2.4.0.266-pre1 18,566 8/16/2017
2.3.5.256-pre6 34,016 6/29/2017
2.3.5.255-pre5 4,703 6/26/2017
2.3.5.239-pre3 27,325 5/11/2017
2.3.5.235-pre2 11,043 4/26/2017
2.3.5.233-pre1 8,886 4/13/2017
2.3.4.270 130,402 8/29/2017
2.3.4.267 63,785 8/16/2017
2.3.4.247 382,454 5/16/2017
2.3.4.231 201,873 4/12/2017
2.3.4.224 241,872 3/29/2017
2.3.4.221-pre6 7,186 3/27/2017
2.3.4.214-pre5 10,086 3/14/2017
2.3.4.212-pre4 6,054 3/10/2017
2.3.4.211-pre3 3,900 3/9/2017
2.3.4.192-pre2 18,996 2/3/2017
2.3.4.184-pre1 12,410 1/13/2017
2.3.3.193 235,150 2/1/2017
2.3.3.180 204,913 1/5/2017
2.3.3.175 116,369 12/6/2016
2.3.3.168 65,173 11/23/2016
2.3.3.166-pre4 7,732 11/3/2016
2.3.3.163-pre3 6,282 10/17/2016
2.3.3.152-pre2 15,578 9/15/2016
2.3.2.127 260,513 9/14/2016
2.3.2.118-pre1 6,719 8/3/2016
2.3.1.114 153,834 8/3/2016
2.3.1.113-pre3 3,735 7/19/2016
2.3.1.111-pre2 4,688 7/4/2016
2.3.1.110-pre1 2,375 6/29/2016
2.3.0.107 195,145 6/29/2016
2.3.0.49 84,852 6/16/2016
2.3.0.46-pre3 15,742 5/30/2016
2.3.0.38-pre2 12,918 4/27/2016
2.3.0.34-pre1 8,578 4/27/2016
2.2.0.45 117,073 5/30/2016
2.2.0.31 126,127 4/27/2016
2.2.0.23-pre4 3,015 4/20/2016
2.2.0.18-pre3 2,230 4/20/2016
2.2.0.5-pre2 15,901 4/8/2016
2.2.0.4-pre1 18,438 4/5/2016
2.1.0.6529 96,785 3/13/2016
2.1.0.6526 17,229 3/9/2016
2.1.0.6524 33,818 3/2/2016
2.1.0.6521 11,806 3/1/2016
2.1.0.6517-pre5 2,015 2/18/2016
2.1.0.6513-pre4 1,994 2/9/2016
2.1.0.6508-pre3 2,317 1/28/2016
2.1.0.6503-pre2 6,903 1/22/2016
2.1.0.6501-pre1 1,463 1/21/2016
2.1.0.6500-pre1 1,285 1/20/2016
2.0.1.6505 91,939 1/28/2016
2.0.1.6495 74,367 1/20/2016
2.0.1.6492-pre1 3,747 12/3/2015
2.0.0.6490 95,647 12/1/2015
2.0.0.6484 17,625 11/21/2015
2.0.0.6482 234,736 11/17/2015
1.5.2.6478-pre3 1,178 11/17/2015
1.5.2.6477-pre2 3,760 11/10/2015
1.5.2.6469-pre1 2,080 10/20/2015
1.5.1.6471 75,408 10/20/2015
1.5.1.6468 3,789 10/20/2015
1.5.1.6460-pre2 1,551 10/13/2015
1.5.1.6455-pre1 2,903 10/2/2015
1.5.0.6447 52,562 9/25/2015
1.5.0.6446 21,299 9/16/2015
1.5.0.6404-pre3 3,201 8/25/2015
1.5.0.6401-pre2 1,407 8/21/2015
1.5.0.6396-pre1 1,859 8/5/2015
1.4.4.6449 2,595 9/25/2015
1.4.4.6443 1,554 9/16/2015
1.4.4.6392 75,690 7/29/2015
1.4.4.6391 1,919 7/28/2015
1.4.4.6387 2,857 7/27/2015
1.4.4.6379-pre3 1,444 7/20/2015
1.4.4.6378-pre2 1,269 7/16/2015
1.4.4.6377-pre1 1,262 7/14/2015
1.4.3.6376 40,940 7/9/2015
1.4.3.6374 16,407 7/1/2015
1.4.3.6372 1,976 6/30/2015
1.4.3.6364-pre3 2,238 6/16/2015
1.4.3.6358-pre2 5,657 4/24/2015
1.4.3.6356-pre1 1,370 4/21/2015
1.4.2.6359 60,528 4/30/2015
1.4.2.6355 14,089 4/21/2015
1.4.2.6353-pre2 2,409 3/31/2015
1.4.2.6350-pre1 1,472 3/30/2015
1.4.1.6349 44,084 3/30/2015
1.4.1.6347-pre2 3,150 3/19/2015
1.4.1.6342-pre1 1,612 3/10/2015
1.4.0.6341 28,537 3/9/2015
1.4.0.6340-pre2 2,426 3/6/2015
1.4.0.6336-pre1 1,440 3/3/2015
1.3.5.6337 5,003 3/5/2015
1.3.5.6335 23,874 3/2/2015
1.3.5.6333-pre1 2,001 2/17/2015
1.3.4.6332 18,526 2/17/2015
1.3.4.6331-pre4 1,460 2/13/2015
1.3.4.6329-pre3 1,198 2/12/2015
1.3.4.6328-pre2 1,204 2/11/2015
1.3.4.6325-pre1 1,167 2/9/2015
1.3.3.6323 51,970 2/9/2015
1.3.3.6322-pre3 1,161 2/6/2015
1.3.3.6321-pre2 1,320 2/4/2015
1.3.3.6318-pre1 1,325 2/2/2015
1.3.2.6316 7,587 2/3/2015
1.3.2.6313-pre3 1,305 1/30/2015
1.3.2.6309-pre2 1,350 1/28/2015
1.3.2.6299-pre1 2,063 1/20/2015
1.3.1.6296 54,584 1/4/2015
1.3.1.6294-pre1 4,341 12/24/2014
1.3.0.6292 9,466 12/24/2014
1.3.0.6286-pre4 2,063 12/19/2014
1.3.0.6284-pre3 1,567 12/12/2014
1.3.0.6280-pre2 1,516 12/9/2014
1.3.0.6275-pre1 7,790 11/12/2014
1.2.3.6257 38,433 10/2/2014
1.2.3.6256-pre4 2,207 9/26/2014
1.2.3.6255-pre3 2,604 9/20/2014
1.2.3.6249-pre2 1,779 9/9/2014
1.2.3.6246-pre1 4,312 8/15/2014
1.2.2.6243 28,323 7/30/2014
1.2.2.6241-pre3 2,708 7/28/2014
1.2.2.6240-pre2 4,550 7/22/2014
1.2.2.6238-pre1 3,676 7/17/2014
1.2.1.6229 8,379 7/14/2014
1.1.1.6206 14,130 6/19/2014
1.1.0.6201 13,285 6/12/2014
1.0.6197 4,117 6/4/2014
1.0.6188 11,565 5/28/2014
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