Industrious.Forms

Make working with Xamarin.Forms just a little bit easier.

See Industrious.ToDo for usage examples in something resembling a real application.

Contents

• AutoFocusBehavior
• BooleanBindingExtension
• BooleanConverter
• BooleanInverseConverter

AutoFocusBehavior

Automatically set the input focus to a particular view when a condition becomes true.

<?xml version="1.0" encoding="UTF-8"?>
<ContentView
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:forms="clr-namespace:Industrious.Forms;assembly=Industrious.Forms"
    x:Class="SampleClass">
    <StackLayout>
        <Entry
            Text="{Binding Title}"
            forms:AutoFocusBehavior.FocusWhen="{Binding ShouldFocusTitle}" />
    </StackLayout>
</ContentView>

A constant can also be used to always set the input focus when the form is loaded.

<Entry
	Text="{Binding Title}"
	forms:AutoFocusBehavior.FocusWhen="True" />

BooleanBindingExtension

A shortcut for binding boolean properties on a Xamarin.Forms view to a non-boolean value on the view model. See BooleanConverter for info on how values are interpreted. Supports the use of "!" to negate the value.

<?xml version="1.0" encoding="UTF-8"?>
<ContentView
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:forms="clr-namespace:Industrious.Forms;assembly=Industrious.Forms"
    x:Class="SampleClass">
    <StackLayout>
        <StackLayout
            x:Name="MainLayout"
            IsVisible="{forms:BooleanBinding ItemCount}">
            <!-- main content goes here -->
        </StackLayout>
        <StackLayout
            x:Name="EmptyCollectionLayout"
            IsVisible="{forms:BooleanBinding !ItemCount}">
            <!-- show this view when there are no items in the collection -->
        </StackLayout>
    </StackLayout>
</ContentView>

BooleanConverter

Converts most types into a boolean value using C-style rules: null and zero values are interpreted as false; anything else evaluates as true. Convenient for those times you'd like to bind an object's visibility to the existence of an object.

public class MyViewModel
{
    public Object SomeObjectProperty { get; set; }
}

<?xml version="1.0" encoding="UTF-8"?>
<ContentView
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:forms="clr-namespace:Industrious.Forms;assembly=Industrious.Forms"
    x:Class="SampleClass">
    <StackLayout>
        <Label
            Text="The object exists"
            IsVisible="{Binding SomeObjectProperty, Converter={forms:BooleanConverter}}" />
    </StackLayout>
</ContentView>

BooleanInverseConverter

Converts most types into a boolean value following the same logic as BooleanConverter, but inverts the results: null and zero values are interpreted as true, anything else evaluates as false.

<?xml version="1.0" encoding="UTF-8"?>
<ContentView
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:forms="clr-namespace:Industrious.Forms;assembly=Industrious.Forms"
    x:Class="SampleClass">
    <StackLayout>
        <Label
            Text="The object does not exists"
            IsVisible="{Binding SomeObjectProperty, Converter={forms:BooleanInverseConverter}}" />
    </StackLayout>
</ContentView>

Stay in touch

• Website - https://industriousone.com
• Twitter - @industrious

License

MIT