Xamarin.Forms 1.4.0.6341

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

There is a newer prerelease version of this package available.
See the version list below for details.
Install-Package Xamarin.Forms -Version 1.4.0.6341
dotnet add package Xamarin.Forms --version 1.4.0.6341
paket add Xamarin.Forms --version 1.4.0.6341
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.

## 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
- [Bug 27072](https://bugzilla.xamarin.com/show_bug.cgi?id=27072) - Listview Context Actions not removed if a different item is tapped in Android

## 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
2.5.0.122203 26,839 12/18/2017
2.5.0.121934 78,337 11/28/2017
2.5.0.91635 60,256 11/16/2017
2.5.0.77107 11,042 11/13/2017
2.5.0.75255-pre3 1,831 11/10/2017
2.5.0.19271-pre2 4,892 10/20/2017
2.4.0.91020 9,407 11/16/2017
2.4.0.74863 19,763 11/10/2017
2.4.0.38779 38,276 10/30/2017
2.4.0.18342 33,954 10/20/2017
2.4.0.282 98,444 9/29/2017
2.4.0.280 67,229 9/27/2017
2.4.0.275-pre3 4,330 9/19/2017
2.4.0.269-pre2 9,411 8/29/2017
2.4.0.266-pre1 8,451 8/16/2017
2.3.5.256-pre6 22,559 6/29/2017
2.3.5.255-pre5 1,866 6/26/2017
2.3.5.239-pre3 21,392 5/11/2017
2.3.5.235-pre2 7,719 4/26/2017
2.3.5.233-pre1 5,529 4/13/2017
2.3.4.270 79,584 8/29/2017
2.3.4.267 46,562 8/16/2017
2.3.4.247 283,279 5/16/2017
2.3.4.231 159,571 4/12/2017
2.3.4.224 202,842 3/29/2017
2.3.4.221-pre6 4,515 3/27/2017
2.3.4.214-pre5 7,372 3/14/2017
2.3.4.212-pre4 3,350 3/10/2017
2.3.4.211-pre3 1,161 3/9/2017
2.3.4.192-pre2 15,078 2/3/2017
2.3.4.184-pre1 8,069 1/13/2017
2.3.3.193 185,966 2/1/2017
2.3.3.180 180,114 1/5/2017
2.3.3.175 106,878 12/6/2016
2.3.3.168 58,375 11/23/2016
2.3.3.166-pre4 5,975 11/3/2016
2.3.3.163-pre3 5,393 10/17/2016
2.3.3.152-pre2 12,564 9/15/2016
2.3.2.127 227,485 9/14/2016
2.3.2.118-pre1 5,933 8/3/2016
2.3.1.114 138,613 8/3/2016
2.3.1.113-pre3 2,861 7/19/2016
2.3.1.111-pre2 3,910 7/4/2016
2.3.1.110-pre1 1,584 6/29/2016
2.3.0.107 177,362 6/29/2016
2.3.0.49 66,744 6/16/2016
2.3.0.46-pre3 12,898 5/30/2016
2.3.0.38-pre2 11,143 4/27/2016
2.3.0.34-pre1 7,215 4/27/2016
2.2.0.45 98,323 5/30/2016
2.2.0.31 115,555 4/27/2016
2.2.0.23-pre4 2,267 4/20/2016
2.2.0.18-pre3 1,469 4/20/2016
2.2.0.5-pre2 15,113 4/8/2016
2.2.0.4-pre1 17,623 4/5/2016
2.1.0.6529 87,342 3/13/2016
2.1.0.6526 15,487 3/9/2016
2.1.0.6524 25,037 3/2/2016
2.1.0.6521 9,367 3/1/2016
2.1.0.6517-pre5 1,189 2/18/2016
2.1.0.6513-pre4 1,134 2/9/2016
2.1.0.6508-pre3 1,427 1/28/2016
2.1.0.6503-pre2 6,013 1/22/2016
2.1.0.6501-pre1 579 1/21/2016
2.1.0.6500-pre1 420 1/20/2016
2.0.1.6505 84,341 1/28/2016
2.0.1.6495 68,215 1/20/2016
2.0.1.6492-pre1 2,913 12/3/2015
2.0.0.6490 85,728 12/1/2015
2.0.0.6484 16,310 11/21/2015
2.0.0.6482 210,734 11/17/2015
1.5.2.6478-pre3 378 11/17/2015
1.5.2.6477-pre2 2,670 11/10/2015
1.5.2.6469-pre1 1,160 10/20/2015
1.5.1.6471 69,164 10/20/2015
1.5.1.6468 2,758 10/20/2015
1.5.1.6460-pre2 637 10/13/2015
1.5.1.6455-pre1 1,816 10/2/2015
1.5.0.6447 42,985 9/25/2015
1.5.0.6446 19,099 9/16/2015
1.5.0.6404-pre3 2,290 8/25/2015
1.5.0.6401-pre2 469 8/21/2015
1.5.0.6396-pre1 1,063 8/5/2015
1.4.4.6449 1,571 9/25/2015
1.4.4.6443 664 9/16/2015
1.4.4.6392 65,265 7/29/2015
1.4.4.6391 1,112 7/28/2015
1.4.4.6387 2,024 7/27/2015
1.4.4.6379-pre3 636 7/20/2015
1.4.4.6378-pre2 473 7/16/2015
1.4.4.6377-pre1 436 7/14/2015
1.4.3.6376 33,308 7/9/2015
1.4.3.6374 14,437 7/1/2015
1.4.3.6372 1,167 6/30/2015
1.4.3.6364-pre3 1,372 6/16/2015
1.4.3.6358-pre2 4,642 4/24/2015
1.4.3.6356-pre1 517 4/21/2015
1.4.2.6359 49,728 4/30/2015
1.4.2.6355 11,994 4/21/2015
1.4.2.6353-pre2 1,561 3/31/2015
1.4.2.6350-pre1 649 3/30/2015
1.4.1.6349 40,502 3/30/2015
1.4.1.6347-pre2 2,365 3/19/2015
1.4.1.6342-pre1 802 3/10/2015
1.4.0.6341 (current version) 26,394 3/9/2015
1.4.0.6340-pre2 1,376 3/6/2015
1.4.0.6336-pre1 681 3/3/2015
1.3.5.6337 4,125 3/5/2015
1.3.5.6335 18,699 3/2/2015
1.3.5.6333-pre1 1,050 2/17/2015
1.3.4.6332 15,472 2/17/2015
1.3.4.6331-pre4 618 2/13/2015
1.3.4.6329-pre3 402 2/12/2015
1.3.4.6328-pre2 440 2/11/2015
1.3.4.6325-pre1 412 2/9/2015
1.3.3.6323 45,058 2/9/2015
1.3.3.6322-pre3 373 2/6/2015
1.3.3.6321-pre2 537 2/4/2015
1.3.3.6318-pre1 496 2/2/2015
1.3.2.6316 6,370 2/3/2015
1.3.2.6313-pre3 470 1/30/2015
1.3.2.6309-pre2 527 1/28/2015
1.3.2.6299-pre1 1,237 1/20/2015
1.3.1.6296 47,495 1/4/2015
1.3.1.6294-pre1 3,350 12/24/2014
1.3.0.6292 8,208 12/24/2014
1.3.0.6286-pre4 1,279 12/19/2014
1.3.0.6284-pre3 806 12/12/2014
1.3.0.6280-pre2 713 12/9/2014
1.3.0.6275-pre1 6,956 11/12/2014
1.2.3.6257 34,887 10/2/2014
1.2.3.6256-pre4 1,404 9/26/2014
1.2.3.6255-pre3 1,770 9/20/2014
1.2.3.6249-pre2 1,002 9/9/2014
1.2.3.6246-pre1 3,355 8/15/2014
1.2.2.6243 25,439 7/30/2014
1.2.2.6241-pre3 1,900 7/28/2014
1.2.2.6240-pre2 3,680 7/22/2014
1.2.2.6238-pre1 2,721 7/17/2014
1.2.1.6229 7,037 7/14/2014
1.1.1.6206 13,241 6/19/2014
1.1.0.6201 11,455 6/12/2014
1.0.6197 3,100 6/4/2014
1.0.6188 10,173 5/28/2014
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