Xamarin.Forms: sharing resources in XAML using Styles

Previously, I’ve blogged about creating a custom Behavior in Xamarin.Forms. The sample published on GitHub initially used the default template available in Visual Studio which instantiates the Application singleton from C# using the following App class:

This is a great approach, however very often it is useful to define common resources in XAML and reuse them across the application using Styles.

To achieve this, It’s possible to transform the App class in a partial one and add a new App.xaml source file containing a resource dictionary to be shared:

In this code, I’ve defined a new resource with a specific Padding to be applied only on iOS via the OnPlatform class, and an explicit style named PageStyle targeting ContentPage types.

The modified code behind is now taking care of parsing/loading the XAML (via the InitializeComponent() call) and then creates an instance of SamplePage:

The page can now consume the new style specifying Style=”{StaticResource PageStyle}” (dynamic resources are also supported):

This is a basic example of using styles in Xamarin.Forms: a complete coverage of the various options is available on the Xamarin official documentation.

The source code is available for download here.

Cordova Windows Store apps and certificate expired error

I was updating TypedMVVM to the latest Visual Studio 2013 Update 4 and Cordova tools (using the new free Community Edition) and trying to deploy the sample to the Windows 8 emulator when I received the following

error APPX0108: The certificate specified has expired

As pointed here by Microsoft Open Technologies, the certificate available in the Visual Studio template has just expired and is not possible to deploy Windows Store apps using the old one.

To solve this problem I’ve then downloaded from here the updated certificate and copied to the following location inside the Visual Studio project:

res/native/windows/CordovaApp_TemporaryKey.pfx

The updated code is available for download on CodePlex.

MultiTouch Behaviors available on NuGet

I’ve received several requests for publishing the MultiTouch Behaviors on the NuGet gallery so I created a simple package containing support for the Windows Phone and Silverlight platforms.

To enable your project for MultiTouch, just run the following command in the Package Manager Console and all the libraries and dependencies will be added to the Visual Studio project:

PM> Install-Package MultiTouchBehaviors

Alternatively just search for the package selecting Tools->Library Package Manager->Manage NuGet Packages for Solution from Visual Studio 2012.

If you are interested in creating a NuGet package for your open-source project, register an account here in the gallery and follow the instructions described in the section “Creating and Publishing a Package“: they are very clear and contain detailed information about the process.

The package definition for MultiTouch is also available in the Source Code section on CodePlex.

Happy Coding!

Multi-Touch Behaviors updated: Windows Phone “Mango” support, Manipulation / Inertia Processors and more

I’ve just published on CodePlex and the Expression gallery a new release of the Multi-Touch behaviors including these new features:

  • support for Windows Phone 7.1 Beta 2 (refresh) “Mango”;
  • added new property “IgnoredTypes” for excluding particular control types from the manipulations (thanks to Richie for the suggestions, feedback and code samples);
  • the “Manipulation Processor” and “Inertia Processor” are now exposed by the behavior in order to enable personalized manipulations and gestures;
  • new properties: CenterX, CenterY, Rotation, Scale permit to support custom gestures like “DoupleTap” zoom;
  • Silverlight 4 and Windows Phone 7.1 samples updated with a simple “DoubleTap” zoom example using the new exposed properties.

The source code and samples are available for download here.

Happy Silverlighting!

Silverlight 4, MEF and MVVM: loading different “MEF Modules” in the same Container

Today I’ve finally found some time to make modifications in the “MEF MVVM” project on Codeplex in order to:

  • create a new module using WCF RIA Services and dynamically load this it inside the “MEF module container” described in the previous post;
  • use the INavigationContentLoader interface and MEF Metadata to share the same container for the various “MEF Modules”;
  • use the new Cosmopolitan theme available for Silverlight Navigation applications;
  • refactor the code of the ViewModel base class using the one available in the latest Prism drops;
  • refactor unit tests inserting an apposite Mock service.

MEFMVVMRIA
The source code is available for download on Codeplex.

Happy Silverlighting!

Windows Phone 7 Multi-Touch Behavior videos #wp7dev

Some time ago I’ve started a Codeplex project dedicated to multi-touch, available on Codeplex at http://multitouch.codeplex.com.

The goal of this project is to provide an unified interface for Silverlight, WPF and Windows Phone 7 in order to provide multi-touch support using a visual approach via the concept of Behavior available in Expression Blend.

Recently I had the honor to welcome in the project a pillar of the Silverlight community, Laurent Bugnion, who is working on the Windows Phone 7 version of the Behavior:

Laurent has just published on his blog two awesome videos to get started with this new Behavior, and has created a specific section on his site http://www.galasoft.ch/touch to announce updates and publish content.

A special thanks to Pete Blois of the Expression Blend team for his help and contributions.

Stay tuned as we’ll be posting updates very soon 🙂

Happy Silverlighting!

The Apache Software Foundation welcomes Microsoft as a Platinum Sponsor

From the apache.org website: 

“At OSCON, Microsoft announced their Sponsorship of The Apache Software Foundation, joining Google and Yahoo! at Platinum level. The generous contributions by Sponsoring organizations and individuals help offset the day-to-day operating expenses to advance the work of The ASF.”

More information by Sam Ramji can be found here.