Xamarin Monkeys: Xamarin.Forms - Style Inheritance
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Xamarin.Forms - Style Inheritance
In this blog post, you will learn how to implement Style Inheritance in Xamarin.Forms app.
Introduction
Style Inheritance
Style inheritance is performed by setting the Style.BasedOn property to an existing Style. In XAML, this is achieved by setting the BasedOn property to a StaticResource markup extension that references a previously created Style.
Prerequisites
- Visual Studio 2017 or later (Windows or Mac)
Setting up a Xamarin.Forms Project
Start by creating a new Xamarin.Forms project. You wíll learn more by going through the steps yourself.
Create a new or existing Xamarin forms(.Net standard) Project. With Android and iOS Platform.
BaseStyle
Now, I'm going to create the base style for buttons in App.Xaml
App.Xaml
<?xml version="1.0" encoding="utf-8"?> <Application xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:d="http://xamarin.com/schemas/2014/forms/design" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="XamarinApp.App"> <Application.Resources>
<Style x:Key="BaseButtonStyle" TargetType="Button"> <Setter Property="TextColor" Value="White" /> <Setter Property="BorderWidth" Value="1" /> <Setter Property="BorderColor" Value="Blue" /> <Setter Property="FontSize" Value="20" />
</Style>
</Application.Resources> </Application>
Style Inheritance
RedButtonStyle
Here, I'm going to inhert base style into the RedbuttonStyle in App.Xaml. See below example
RedButtonStyle.xaml
<?xml version="1.0" encoding="utf-8"?> <Application xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:d="http://xamarin.com/schemas/2014/forms/design" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="XamarinApp.App"> <Application.Resources>
<Style x:Key="BaseButtonStyle" TargetType="Button"> <Setter Property="TextColor" Value="White" /> <Setter Property="BorderWidth" Value="1" /> <Setter Property="BorderColor" Value="Blue" /> <Setter Property="FontSize" Value="20" />
</Style>
<Style x:Key="RedButtonStyle" TargetType="Button" BasedOn="{StaticResource BaseButtonStyle}"> <Setter Property="BackgroundColor" Value="Red" /> </Style>
</Application.Resources> </Application>
GreenButtonStyle
Here, I'm going to inhert base style into the RedbuttonStyle in App.Xaml. See below example
GreenButtonStyle.xaml
<?xml version="1.0" encoding="utf-8"?> <Application xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:d="http://xamarin.com/schemas/2014/forms/design" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="XamarinApp.App"> <Application.Resources>
<Style x:Key="BaseButtonStyle" TargetType="Button"> <Setter Property="TextColor" Value="White" /> <Setter Property="BorderWidth" Value="1" /> <Setter Property="BorderColor" Value="Blue" /> <Setter Property="FontSize" Value="20" />
</Style>
<Style x:Key="GreenButtonStyle" TargetType="Button" BasedOn="{StaticResource BaseButtonStyle}"> <Setter Property="BackgroundColor" Value="Green" /> </Style>
<Style x:Key="RedButtonStyle" TargetType="Button" BasedOn="{StaticResource BaseButtonStyle}"> <Setter Property="BackgroundColor" Value="Red" /> </Style>
</Application.Resources> </Application>
Consume Style
Now, I'm going to consume the style into my button.
MainPage.Xaml
<?xml version="1.0" encoding="UTF-8"?> <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:xct="http://xamarin.com/schemas/2020/toolkit" x:Class="XamarinApp.LoginPage"> <ContentPage.Resources> </ContentPage.Resources> <ContentPage.Content> <StackLayout HorizontalOptions="Fill" Margin="50,100" VerticalOptions="Start"> <Label Text="Style Inheritance" FontSize="Large"/> <Button Style="{StaticResource RedButtonStyle}" Text="Red Button"/> <Button Style="{StaticResource GreenButtonStyle}" Text="Green Button"/>
</StackLayout> </ContentPage.Content> </ContentPage>
Run
I hope you have understood you will learn how to implement Style Inheritance in Xamarin.Forms.
Thanks for reading. Please share your comments and feedback.
Happy Coding :)
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