Wednesday, December 7, 2016

Xamarin Forms: Customizing the Synfusion Kanban Control is as simple as 1-2-3

Following on from my previous post on getting started with the Kanban Control from Syncfusion, we’re going to have a look at customizing the kanban card template, binding the tap event on the card to execute a command and binding the card to a custom model.

As always, you can find all the source code here

image       image  image

Disclaimer: As of this writing, there are rendering issues with the Windows UWP implementation. A support ticket has be lodged with Syncfusion and it should be resolved with the next iterative release.

1) Providing a Custom Model

In the previous post, we used a KanbanModel to bind against. But you’re free to bind against any object, so long as the properties fire a NotifyPropertyChange event (class must implement the INotifyPropertyChange interface).

In the custom example, I’m using the CustomModel class, which inherits from the BindableBase class that comes out the box with the Prism.Core nuget package.

Properties look something like:


Remember that the columns in the Kanban control map by default to a ‘Category’ property. If you want the columns to map to a different property on the model, then set the ColumnMappingPath property on the SfKanban control


2) Customizing the Kanban Card

If you’re accustomed to any XAML technology, then customizing the kanban card should be familiar. The idea is that you supply a custom user control to act as a template when rendering the items for the bound collection. For a sample of a custom user control, check out the CustomCard.xaml user control in the source code. The only significant thing to note is the root element is a ContentView.

Once you have a template defined, then the only thing left to do, is to add it as the DataTemplate to the SfKanban control:


3) Binding the Tap Event to a Command on the ViewModel

It’s a common scenario that you want to perform a certain action when the user taps in a card. Currently there is no TapItemCommand property on the SfKanban control, but you can achieve the same thing by implementing a behavior.

The KanbanItemTappedToCommandBehavior can be found here.

Basically it takes the ItemTapped event from the card, and executes the command when the event fires.

You then bind the behavior to the SfKanban control like so:


The command on the ViewModel would look something like:


… and that’s it.

Happy Coding.

Daily Links 7 Dec 2016

7 Tips for Designing a Better REST API

Ten ways to minimize Azure costs

Free local development using the DocumentDB Emulator plus .NET Core support

.NET Standard 2.0 - Making Sense of .NET Again

Hacking the Xamarin.Forms Layout System for Fun and Profit

Resource Files in Xamarin Forms

Continuous Integration and Continuous Delivery for Xamarin.iOS With VSTS

Azure App Services Continuous Delivery

Introducing Xamarin.Forms 2.3.3: Native View Declaration and Platform Specifics

How Passwordless Authentication Works

Xamarin.Forms: Java.Lang.IllegalStateException

Setting Up Android x86 HAXM Emulators

Thursday, December 1, 2016

Xamarin Forms and the Syncfusion Kanban Control: Getting Started



Xamarin Forms and Syncfusion Xamarin Controls are a great combination to get great looking cross platform native mobile apps while using a mostly shared code base.

In this blog post we’re going to look at getting started with one of the newer controls to the syncfusion xamarin family: The Kanban Control

First and foremost, all the source code for the examples below can be found here

If you’re not familiar with getting a Xamarin Forms app up and running – have a look at the quick start outlines here

Nuget packages for syncfusion controls can be found here – keep in mind you need a license to be able to use them. Luckily if you’re a hobbyist developer or a company with less than five people, you can get a community license which is FREE!

Okay – time to get started.
I’m going to assume you already set up a Xamarin Forms wireframe app – check out the quick start above for details on how to get that up and running.
Usually a new Xamarin Forms project adds Windows Phone variant projects. I tend to stick with UWP only for windows, since this is generally more actively supported by control suites.

To get access to the syncfusion nugets, setup a new nuget package source that points to the syncfusion nuget location.
Add nuget packages for the syncfusion kanban control:


be sure to set the source to the syncfusion xamarin nuget location:


Every project needs to have a reference to the Syncfusion.Xamarin.SfKanban nuget package. You’ll notice there are Android and iOS variants for the package too – these are for the specific Xamarin native platforms (would have been helpful if they actually postfixed the package with “.Forms” – can get a bit confusing as to which package to pick)

Now for some code:

In the portable library, create a ViewModel class to contain all the items that the cards on the kanban control are going to bind to. A sample of the ViewModel class can be found here
The important bits:

You need a class that is the model that each kanban card will represent. Syncfusion provides a default called KanbanModel. We’ll use this for now, but you can use your own model classes too (which I’ll cover in another post). Place an ObservableCollection of this model as a property on the ViewModel class:


…. and then add some items to the collection:


Take note of the Category property, as this is going to be used by the control to know in which swim lane to place the kanban card.

Next, create a page that will host the kanban control – sample can be found here


… and then wire up the BindingContext of the Page to your ViewModel:


.. and then attach categories to each column, so the kanban control knows where to place each item template:


This is done in code behind, but you could just as easily bind these to ViewModel properties in XAML.

Be sure to set the Page to the startup page in the Forms App class:


… and that should be it. Download the source code and give it a test drive.

In my next post I’ll cover:

  • Bind cards to custom models
  • Creating a custom card template
  • Opening up another page when a card gets tapped using a command.

Happy Coding.