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There is a newer version of this package available.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
4.0.0.135214-pre4 2,152 2/6/2019
4.0.0.94569-pre3 3,187 1/24/2019
4.0.0.62955-pre2 7,023 1/10/2019
4.0.0.8055-pre1 9,322 12/4/2018
3.6.0.135200-pre1 291 2/6/2019
3.5.0.129452 26,106 2/6/2019
3.5.0.94564-pre3 458 1/24/2019
3.5.0.62956-pre2 571 1/10/2019
3.4.0.1029999 36,174 1/24/2019
3.4.0.1009999 51,842 1/4/2019
3.4.0.1008975 199,300 11/15/2018
3.4.0.987044-pre2 2,037 11/8/2018
3.4.0.925479-pre1 7,171 10/18/2018
3.3.0.967583 115,319 11/1/2018
3.3.0.912540 81,494 10/18/2018
3.3.0.893527-pre3 4,545 10/11/2018
3.3.0.871608-pre2 7,470 10/1/2018
3.3.0.840541-pre1 3,658 9/20/2018
3.2.0.871581 71,767 10/3/2018
3.2.0.839982 88,927 9/17/2018
3.2.0.809874-pre3 3,089 9/10/2018
3.2.0.729530-pre2 8,980 8/14/2018
3.2.0.637442-pre1 7,559 7/17/2018
3.1.0.697729 270,354 8/1/2018
3.1.0.637273 82,900 7/11/2018
3.1.0.583944 117,692 6/20/2018
3.1.0.561732-pre4 5,534 6/11/2018
3.1.0.550168-pre3 2,651 6/6/2018
3.1.0.530888-pre2 1,568 6/4/2018
3.1.0.469394-pre1 10,609 5/9/2018
3.0.0.561731 129,578 6/11/2018
3.0.0.550146 24,196 6/6/2018
3.0.0.530893 18,289 6/4/2018
3.0.0.482510 193,512 5/14/2018
3.0.0.446417 107,510 5/1/2018
3.0.0.427558-pre4 8,181 4/25/2018
3.0.0.354232-pre3 12,878 4/5/2018
3.0.0.296286-pre2 7,796 3/20/2018
2.5.1.527436 66,970 5/4/2018
2.5.1.444934 142,277 4/4/2018
2.5.1.392594-pre3 3,933 3/21/2018
2.5.1.340284-pre2 5,621 3/9/2018
2.5.1.317207-pre1 5,391 3/1/2018
2.5.0.280555 287,620 2/16/2018
2.5.0.122203 292,096 12/18/2017
2.5.0.121934 185,697 11/28/2017
2.5.0.91635 121,438 11/16/2017
2.5.0.77107 27,068 11/13/2017
2.5.0.75255-pre3 5,159 11/10/2017
2.5.0.19271-pre2 8,733 10/20/2017
2.4.0.91020 41,566 11/16/2017
2.4.0.74863 33,159 11/10/2017
2.4.0.38779 57,334 10/30/2017
2.4.0.18342 52,940 10/20/2017
2.4.0.282 152,764 9/29/2017
2.4.0.280 173,271 9/27/2017
2.4.0.275-pre3 7,789 9/19/2017
2.4.0.269-pre2 13,217 8/29/2017
2.4.0.266-pre1 18,296 8/16/2017
2.3.5.256-pre6 33,414 6/29/2017
2.3.5.255-pre5 4,635 6/26/2017
2.3.5.239-pre3 27,120 5/11/2017
2.3.5.235-pre2 10,952 4/26/2017
2.3.5.233-pre1 8,787 4/13/2017
2.3.4.270 127,833 8/29/2017
2.3.4.267 62,683 8/16/2017
2.3.4.247 377,908 5/16/2017
2.3.4.231 200,069 4/12/2017
2.3.4.224 239,821 3/29/2017
2.3.4.221-pre6 7,113 3/27/2017
2.3.4.214-pre5 9,993 3/14/2017
2.3.4.212-pre4 5,983 3/10/2017
2.3.4.211-pre3 3,827 3/9/2017
2.3.4.192-pre2 18,880 2/3/2017
2.3.4.184-pre1 12,214 1/13/2017
2.3.3.193 231,698 2/1/2017
2.3.3.180 203,616 1/5/2017
2.3.3.175 115,842 12/6/2016
2.3.3.168 64,559 11/23/2016
2.3.3.166-pre4 7,592 11/3/2016
2.3.3.163-pre3 6,201 10/17/2016
2.3.3.152-pre2 15,391 9/15/2016
2.3.2.127 259,281 9/14/2016
2.3.2.118-pre1 6,645 8/3/2016
2.3.1.114 153,096 8/3/2016
2.3.1.113-pre3 3,662 7/19/2016
2.3.1.111-pre2 4,616 7/4/2016
2.3.1.110-pre1 2,300 6/29/2016
2.3.0.107 194,460 6/29/2016
2.3.0.49 83,623 6/16/2016
2.3.0.46-pre3 15,571 5/30/2016
2.3.0.38-pre2 12,787 4/27/2016
2.3.0.34-pre1 8,469 4/27/2016
2.2.0.45 116,318 5/30/2016
2.2.0.31 125,581 4/27/2016
2.2.0.23-pre4 2,945 4/20/2016
2.2.0.18-pre3 2,159 4/20/2016
2.2.0.5-pre2 15,827 4/8/2016
2.2.0.4-pre1 18,367 4/5/2016
2.1.0.6529 96,256 3/13/2016
2.1.0.6526 17,106 3/9/2016
2.1.0.6524 32,379 3/2/2016
2.1.0.6521 11,680 3/1/2016
2.1.0.6517-pre5 1,942 2/18/2016
2.1.0.6513-pre4 1,922 2/9/2016
2.1.0.6508-pre3 2,243 1/28/2016
2.1.0.6503-pre2 6,828 1/22/2016
2.1.0.6501-pre1 1,389 1/21/2016
2.1.0.6500-pre1 1,211 1/20/2016
2.0.1.6505 91,548 1/28/2016
2.0.1.6495 74,113 1/20/2016
2.0.1.6492-pre1 3,675 12/3/2015
2.0.0.6490 95,146 12/1/2015
2.0.0.6484 17,529 11/21/2015
2.0.0.6482 233,196 11/17/2015
1.5.2.6478-pre3 1,103 11/17/2015
1.5.2.6477-pre2 3,686 11/10/2015
1.5.2.6469-pre1 2,006 10/20/2015
1.5.1.6471 75,012 10/20/2015
1.5.1.6468 3,706 10/20/2015
1.5.1.6460-pre2 1,484 10/13/2015
1.5.1.6455-pre1 2,823 10/2/2015
1.5.0.6447 51,802 9/25/2015
1.5.0.6446 21,146 9/16/2015
1.5.0.6404-pre3 3,125 8/25/2015
1.5.0.6401-pre2 1,335 8/21/2015
1.5.0.6396-pre1 1,792 8/5/2015
1.4.4.6449 2,510 9/25/2015
1.4.4.6443 1,476 9/16/2015
1.4.4.6392 75,263 7/29/2015
1.4.4.6391 1,845 7/28/2015
1.4.4.6387 2,784 7/27/2015
1.4.4.6379-pre3 1,373 7/20/2015
1.4.4.6378-pre2 1,200 7/16/2015
1.4.4.6377-pre1 1,190 7/14/2015
1.4.3.6376 40,571 7/9/2015
1.4.3.6374 16,293 7/1/2015
1.4.3.6372 1,901 6/30/2015
1.4.3.6364-pre3 2,155 6/16/2015
1.4.3.6358-pre2 5,581 4/24/2015
1.4.3.6356-pre1 1,298 4/21/2015
1.4.2.6359 59,961 4/30/2015
1.4.2.6355 13,964 4/21/2015
1.4.2.6353-pre2 2,331 3/31/2015
1.4.2.6350-pre1 1,401 3/30/2015
1.4.1.6349 43,947 3/30/2015
1.4.1.6347-pre2 3,080 3/19/2015
1.4.1.6342-pre1 1,539 3/10/2015
1.4.0.6341 28,386 3/9/2015
1.4.0.6340-pre2 2,346 3/6/2015
1.4.0.6336-pre1 1,371 3/3/2015
1.3.5.6337 4,933 3/5/2015
1.3.5.6335 23,407 3/2/2015
1.3.5.6333-pre1 1,932 2/17/2015
1.3.4.6332 18,141 2/17/2015
1.3.4.6331-pre4 1,383 2/13/2015
1.3.4.6329-pre3 1,126 2/12/2015
1.3.4.6328-pre2 1,130 2/11/2015
1.3.4.6325-pre1 1,096 2/9/2015
1.3.3.6323 51,630 2/9/2015
1.3.3.6322-pre3 1,086 2/6/2015
1.3.3.6321-pre2 1,242 2/4/2015
1.3.3.6318-pre1 1,248 2/2/2015
1.3.2.6316 7,491 2/3/2015
1.3.2.6313-pre3 1,225 1/30/2015
1.3.2.6309-pre2 1,274 1/28/2015
1.3.2.6299-pre1 1,983 1/20/2015
1.3.1.6296 54,131 1/4/2015
1.3.1.6294-pre1 4,254 12/24/2014
1.3.0.6292 9,361 12/24/2014
1.3.0.6286-pre4 1,986 12/19/2014
1.3.0.6284-pre3 1,489 12/12/2014
1.3.0.6280-pre2 1,438 12/9/2014
1.3.0.6275-pre1 7,715 11/12/2014
1.2.3.6257 38,155 10/2/2014
1.2.3.6256-pre4 2,131 9/26/2014
1.2.3.6255-pre3 2,524 9/20/2014
1.2.3.6249-pre2 1,700 9/9/2014
1.2.3.6246-pre1 4,225 8/15/2014
1.2.2.6243 28,134 7/30/2014
1.2.2.6241-pre3 2,633 7/28/2014
1.2.2.6240-pre2 4,469 7/22/2014
1.2.2.6238-pre1 3,590 7/17/2014
1.2.1.6229 8,271 7/14/2014
1.1.1.6206 14,048 6/19/2014
1.1.0.6201 13,149 6/12/2014
1.0.6197 4,022 6/4/2014
1.0.6188 11,465 5/28/2014
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