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There is a newer version of this package available.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
<PackageReference Include="Xamarin.Forms" Version="1.4.0.6336-pre1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
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

Showing the top 10 GitHub repositories that depend on Xamarin.Forms:

Repository Stars
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microsoft/ailab
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PrismLibrary/Prism
Prism is a framework for building loosely coupled, maintainable, and testable XAML applications in WPF, Windows 10 UWP, and Xamarin Forms.
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The .NET MVVM framework for cross-platform solutions, including Xamarin.iOS, Xamarin.Android, Windows and Mac.
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Sample apps built using the Xamarin.Forms framework
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Plugins for Xamarin

Version History

Version Downloads Last updated
4.3.0.819712-pre2 125 9/19/2019
4.3.0.778476-pre1 2,906 9/11/2019
4.2.0.815419 1,005 9/19/2019
4.2.0.778463 21,127 9/11/2019
4.2.0.709249 64,848 8/21/2019
4.2.0.673161-pre3 6,105 8/7/2019
4.2.0.618605-pre2 7,134 7/24/2019
4.2.0.608146-pre1 3,363 7/16/2019
4.1.0.778454 1,182 9/11/2019
4.1.0.709244 8,611 8/21/2019
4.1.0.673156 60,394 8/7/2019
4.1.0.618606 63,317 7/24/2019
4.1.0.581479 77,758 7/9/2019
4.1.0.555618 127,481 6/28/2019
4.1.0.496342-pre2 6,694 6/13/2019
4.1.0.483098-pre1 4,586 6/5/2019
4.0.0.709238 852 8/21/2019
4.0.0.618610 1,688 7/24/2019
4.0.0.540366 28,453 6/27/2019
4.0.0.497661 60,261 6/13/2019
4.0.0.482894 47,042 6/3/2019
4.0.0.425677 167,305 5/14/2019
4.0.0.394984-pre10 9,282 5/3/2019
4.0.0.346134-pre9 15,157 4/18/2019
4.0.0.304370-pre8 10,351 4/3/2019
4.0.0.250467-pre7 7,459 3/20/2019
4.0.0.232914-pre6 7,688 3/14/2019
4.0.0.169046-pre5 5,923 2/21/2019
4.0.0.135214-pre4 4,676 2/6/2019
4.0.0.94569-pre3 4,281 1/24/2019
4.0.0.62955-pre2 13,301 1/10/2019
4.0.0.8055-pre1 13,672 12/4/2018
3.6.0.709228 2,530 8/21/2019
3.6.0.539721 19,022 6/27/2019
3.6.0.344457 151,263 4/18/2019
3.6.0.293080 91,934 4/3/2019
3.6.0.264807 158,555 3/19/2019
3.6.0.220655 102,565 3/6/2019
3.6.0.169048-pre2 535 2/21/2019
3.6.0.135200-pre1 4,781 2/6/2019
3.5.0.274416 14,839 3/26/2019
3.5.0.169047 88,597 2/20/2019
3.5.0.129452 126,138 2/6/2019
3.5.0.94564-pre3 1,115 1/24/2019
3.5.0.62956-pre2 1,030 1/10/2019
3.4.0.1039999 11,568 3/26/2019
3.4.0.1029999 89,083 1/24/2019
3.4.0.1009999 104,837 1/4/2019
3.4.0.1008975 445,302 11/15/2018
3.4.0.987044-pre2 2,346 11/8/2018
3.4.0.925479-pre1 10,846 10/18/2018
3.3.0.967583 166,565 11/1/2018
3.3.0.912540 119,924 10/18/2018
3.3.0.893527-pre3 7,727 10/11/2018
3.3.0.871608-pre2 11,991 10/1/2018
3.3.0.840541-pre1 6,070 9/20/2018
3.2.0.871581 113,287 10/3/2018
3.2.0.839982 158,483 9/17/2018
3.2.0.809874-pre3 3,785 9/10/2018
3.2.0.729530-pre2 12,793 8/14/2018
3.2.0.637442-pre1 10,547 7/17/2018
3.1.0.697729 350,938 8/1/2018
3.1.0.637273 106,524 7/11/2018
3.1.0.583944 145,749 6/20/2018
3.1.0.561732-pre4 6,341 6/11/2018
3.1.0.550168-pre3 3,095 6/6/2018
3.1.0.530888-pre2 1,918 6/4/2018
3.1.0.469394-pre1 11,430 5/9/2018
3.0.0.561731 145,924 6/11/2018
3.0.0.550146 27,893 6/6/2018
3.0.0.530893 21,432 6/4/2018
3.0.0.482510 247,873 5/14/2018
3.0.0.446417 134,949 5/1/2018
3.0.0.427558-pre4 9,253 4/25/2018
3.0.0.354232-pre3 14,193 4/5/2018
3.0.0.296286-pre2 8,391 3/20/2018
2.5.1.527436 92,351 5/4/2018
2.5.1.444934 170,290 4/4/2018
2.5.1.392594-pre3 4,286 3/21/2018
2.5.1.340284-pre2 6,468 3/9/2018
2.5.1.317207-pre1 5,784 3/1/2018
2.5.0.280555 325,226 2/16/2018
2.5.0.122203 335,926 12/18/2017
2.5.0.121934 218,559 11/28/2017
2.5.0.91635 161,064 11/16/2017
2.5.0.77107 30,510 11/13/2017
2.5.0.75255-pre3 5,549 11/10/2017
2.5.0.19271-pre2 9,528 10/20/2017
2.4.0.91020 49,514 11/16/2017
2.4.0.74863 35,105 11/10/2017
2.4.0.38779 61,833 10/30/2017
2.4.0.18342 56,034 10/20/2017
2.4.0.282 163,962 9/29/2017
2.4.0.280 203,787 9/27/2017
2.4.0.275-pre3 8,228 9/19/2017
2.4.0.269-pre2 13,831 8/29/2017
2.4.0.266-pre1 19,847 8/16/2017
2.3.5.256-pre6 36,090 6/29/2017
2.3.5.255-pre5 5,035 6/26/2017
2.3.5.239-pre3 28,250 5/11/2017
2.3.5.235-pre2 11,419 4/26/2017
2.3.5.233-pre1 9,287 4/13/2017
2.3.4.270 148,699 8/29/2017
2.3.4.267 68,228 8/16/2017
2.3.4.247 421,899 5/16/2017
2.3.4.231 211,565 4/12/2017
2.3.4.224 251,009 3/29/2017
2.3.4.221-pre6 7,559 3/27/2017
2.3.4.214-pre5 10,450 3/14/2017
2.3.4.212-pre4 6,390 3/10/2017
2.3.4.211-pre3 4,212 3/9/2017
2.3.4.192-pre2 19,578 2/3/2017
2.3.4.184-pre1 13,110 1/13/2017
2.3.3.193 247,610 2/1/2017
2.3.3.180 211,524 1/5/2017
2.3.3.175 118,578 12/6/2016
2.3.3.168 67,013 11/23/2016
2.3.3.166-pre4 8,181 11/3/2016
2.3.3.163-pre3 6,523 10/17/2016
2.3.3.152-pre2 16,217 9/15/2016
2.3.2.127 287,458 9/14/2016
2.3.2.118-pre1 6,947 8/3/2016
2.3.1.114 156,623 8/3/2016
2.3.1.113-pre3 3,950 7/19/2016
2.3.1.111-pre2 4,886 7/4/2016
2.3.1.110-pre1 2,598 6/29/2016
2.3.0.107 207,539 6/29/2016
2.3.0.49 88,582 6/16/2016
2.3.0.46-pre3 16,275 5/30/2016
2.3.0.38-pre2 13,333 4/27/2016
2.3.0.34-pre1 8,916 4/27/2016
2.2.0.45 137,707 5/30/2016
2.2.0.31 128,320 4/27/2016
2.2.0.23-pre4 3,230 4/20/2016
2.2.0.18-pre3 2,442 4/20/2016
2.2.0.5-pre2 16,136 4/8/2016
2.2.0.4-pre1 18,646 4/5/2016
2.1.0.6529 98,884 3/13/2016
2.1.0.6526 17,723 3/9/2016
2.1.0.6524 36,762 3/2/2016
2.1.0.6521 12,261 3/1/2016
2.1.0.6517-pre5 2,318 2/18/2016
2.1.0.6513-pre4 2,299 2/9/2016
2.1.0.6508-pre3 2,614 1/28/2016
2.1.0.6503-pre2 7,204 1/22/2016
2.1.0.6501-pre1 1,759 1/21/2016
2.1.0.6500-pre1 1,584 1/20/2016
2.0.1.6505 93,642 1/28/2016
2.0.1.6495 75,357 1/20/2016
2.0.1.6492-pre1 4,041 12/3/2015
2.0.0.6490 98,132 12/1/2015
2.0.0.6484 17,998 11/21/2015
2.0.0.6482 241,748 11/17/2015
1.5.2.6478-pre3 1,462 11/17/2015
1.5.2.6477-pre2 4,098 11/10/2015
1.5.2.6469-pre1 2,383 10/20/2015
1.5.1.6471 77,140 10/20/2015
1.5.1.6468 4,105 10/20/2015
1.5.1.6460-pre2 1,852 10/13/2015
1.5.1.6455-pre1 3,211 10/2/2015
1.5.0.6447 55,813 9/25/2015
1.5.0.6446 21,925 9/16/2015
1.5.0.6404-pre3 3,502 8/25/2015
1.5.0.6401-pre2 1,704 8/21/2015
1.5.0.6396-pre1 2,145 8/5/2015
1.4.4.6449 2,946 9/25/2015
1.4.4.6443 1,845 9/16/2015
1.4.4.6392 77,524 7/29/2015
1.4.4.6391 2,199 7/28/2015
1.4.4.6387 3,137 7/27/2015
1.4.4.6379-pre3 1,725 7/20/2015
1.4.4.6378-pre2 1,549 7/16/2015
1.4.4.6377-pre1 1,551 7/14/2015
1.4.3.6376 42,905 7/9/2015
1.4.3.6374 16,842 7/1/2015
1.4.3.6372 2,276 6/30/2015
1.4.3.6364-pre3 2,526 6/16/2015
1.4.3.6358-pre2 5,965 4/24/2015
1.4.3.6356-pre1 1,635 4/21/2015
1.4.2.6359 63,119 4/30/2015
1.4.2.6355 14,629 4/21/2015
1.4.2.6353-pre2 2,687 3/31/2015
1.4.2.6350-pre1 1,744 3/30/2015
1.4.1.6349 44,776 3/30/2015
1.4.1.6347-pre2 3,425 3/19/2015
1.4.1.6342-pre1 1,879 3/10/2015
1.4.0.6341 29,205 3/9/2015
1.4.0.6340-pre2 2,725 3/6/2015
1.4.0.6336-pre1 1,711 3/3/2015
1.3.5.6337 5,308 3/5/2015
1.3.5.6335 25,493 3/2/2015
1.3.5.6333-pre1 2,288 2/17/2015
1.3.4.6332 19,459 2/17/2015
1.3.4.6331-pre4 1,743 2/13/2015
1.3.4.6329-pre3 1,468 2/12/2015
1.3.4.6328-pre2 1,476 2/11/2015
1.3.4.6325-pre1 1,443 2/9/2015
1.3.3.6323 53,409 2/9/2015
1.3.3.6322-pre3 1,437 2/6/2015
1.3.3.6321-pre2 1,600 2/4/2015
1.3.3.6318-pre1 1,600 2/2/2015
1.3.2.6316 7,947 2/3/2015
1.3.2.6313-pre3 1,584 1/30/2015
1.3.2.6309-pre2 1,629 1/28/2015
1.3.2.6299-pre1 2,343 1/20/2015
1.3.1.6296 57,210 1/4/2015
1.3.1.6294-pre1 4,664 12/24/2014
1.3.0.6292 9,816 12/24/2014
1.3.0.6286-pre4 2,345 12/19/2014
1.3.0.6284-pre3 1,846 12/12/2014
1.3.0.6280-pre2 1,794 12/9/2014
1.3.0.6275-pre1 8,073 11/12/2014
1.2.3.6257 39,406 10/2/2014
1.2.3.6256-pre4 2,481 9/26/2014
1.2.3.6255-pre3 2,891 9/20/2014
1.2.3.6249-pre2 2,068 9/9/2014
1.2.3.6246-pre1 4,636 8/15/2014
1.2.2.6243 28,980 7/30/2014
1.2.2.6241-pre3 2,995 7/28/2014
1.2.2.6240-pre2 4,835 7/22/2014
1.2.2.6238-pre1 3,996 7/17/2014
1.2.1.6229 8,797 7/14/2014
1.1.1.6206 14,451 6/19/2014
1.1.0.6201 13,845 6/12/2014
1.0.6197 4,421 6/4/2014
1.0.6188 12,003 5/28/2014
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