Book Image

Xamarin Blueprints

By : Michael Williams
Book Image

Xamarin Blueprints

By: Michael Williams

Overview of this book

Do you want to create powerful, efficient, and independent apps from scratch that will leverage the Xamarin framework and code with C#? Well, look no further; you’ve come to the right place! This is a learn-as-you-build practical guide to building eight full-fledged applications using Xamarin.Forms, Xamarin Android, and Xamarin iOS. Each chapter includes a project, takes you through the process of building applications (such as a gallery Application, a text-to-speech service app, a GPS locator app, and a stock market app), and will show you how to deploy the application’s source code to a Google Cloud Source Repository. Other practical projects include a chat and a media-editing app, as well as other examples fit to adorn any developer’s utility belt. In the course of building applications, this book will teach you how to design and prototype professional-grade applications implementing performance and security considerations.
Table of Contents (14 chapters)
Xamarin Blueprints
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

Triggers


The first page will consist of two buttons, an image, a label, and extra additional UI functionality known as triggers. Triggers are declarative objects used in XAML, which contain actions executed when certain conditions or events occur. The main advantage of triggers is we can box up these handle actions for as many UI elements that need to perform the same actions. We have the option of the following four different types of triggers:

  • Property trigger: This is executed when a property on a control is set to a particular value.

  • Data trigger: This is same as the property trigger but uses data binding.

  • Event trigger: This is occurs when an event occurs on the control.

  • Multi trigger: This is allows multiple trigger conditions to be set before an action occurs.

In our solution, we are going to add two event triggers for button click events.

Let's start with adding a new folder called Triggers into the Camera project, add a new file called ButtonClickTrigger.cs, and implement the following...