Global styles for FontImageSource property

Question

I have following button in my Xamarin Forms application

    <Button
        Grid.Column="1"
        Grid.Row="0">
        <Button.ImageSource>
            <FontImageSource Glyph="&#xF072;" FontFamily="{StaticResource IconFont}" Color="{StaticResource BaseColor}"/>
        </Button.ImageSource>
    </Button>   

where IconFont is:

    <OnPlatform x:TypeArguments="x:String" x:Key="IconFont">
        <On Platform="Android" Value="materialdesignicons-webfont.ttf#Material design" />
        <On Platform="iOS" Value="Material Design Icons" />
    </OnPlatform>

Everything is working fine. Now, because all of my icons are in materialdesignicons-webfont and I will never use different icons I decided to move entire styling to App.xaml. I would like to set default properties like that:

    <Style TargetType="FontImageSource">
        <Setter Property="FontFamily" Value="{StaticResource IconFont}" />
        <Setter Property="Color" Value="{StaticResource BaseColor}" />
    </Style>

And use button by passing glyph only.

    <Button
        Grid.Column="1"
        Grid.Row="0">
        <Button.ImageSource>
            <FontImageSource Glyph="&#xF072;"/>
        </Button.ImageSource>
    </Button>   

1. For some reasons Icon is not rendered without specifying FontFamily and Color directly in FontImageSource. Am I missing something?

2. Is there some way to call my button in simpler way? F.e.

    <Button
        Grid.Column="1"
        Grid.Row="0"
        MDGlyph="&#xF072;" />

Answer 1

Unfortunately it is not possible to style a FontImageSource currently. However, there is a github issue requesting this capability.

Answer 2

have you tried this:

    <Style x:Key="ButtonWithFontImageSource" TargetType="Button">
       <Setter Property="ImageSource">
            <FontImageSource 
                FontFamily="{StaticResource FontIcons}"
                Glyph="{DynamicResource IconText}">
            </FontImageSource>
        <Setter>
    </Style>