Change Icons from Path to IconPack value

Is your feature request related to a problem? Please describe.

Consider the following:

<Setter Property="HamburgerButtonTemplate">
    <Setter.Value>
        <DataTemplate>
            <!--  PackIconMaterial - Menu  -->
            <ContentControl Content="M3,6H21V8H3V6M3,11H21V13H3V11M3,16H21V18H3V16Z"
                            Height="22"
                            Width="22"
                            Style="{DynamicResource MahApps.Styles.ContentControl.PathIcon}" />
        </DataTemplate>
    </Setter.Value>
</Setter>

Using this implementation, users have to completely reimplement the template in order to override the Content value (and it's corresponding PathIcon style. This is same approach is used throughout the library:

<ControlTemplate x:Key="MahApps.Templates.WindowButtonCommands" TargetType="{x:Type Controls:WindowButtonCommands}">
    <StackPanel Orientation="Horizontal">
        <Button x:Name="PART_Min" ... >
            <Path Data="F1M0,6L0,9 9,9 9,6 0,6z" ... />
        </Button>
        ...
    </StackPanel>
    ...
</ControlTemplate>

Using hard-coded paths as icon values makes them impossible to override without recreating the template.

Describe the solution you'd like

I suggest implementing a new approach with a new dependency property (or series of dependency properties, as needed) (ControlHelper.Content or ControlHelper.Content.WindowCloseButton, ControlHelper.Content.WindowMaximizeButton) and a subset of the MahApps.Metro.IconPacks library that contains only the icons required for the styles provided in MahApps.Metro (this will keep the size of the library small):


<!-- HamburgerMenu -->
<Setter Property="HamburgerButtonTemplate">
    <Setter.Value>
        <DataTemplate>
            <ContentControl Content="{Binding Path=Controls:ControlsHelper.Content.HamburgerMenuButton, RelativeSource={...}}" />
        </DataTemplate>
    </Setter.Value>
</Setter>

<Style x:Key="MahApps.Styles.ListBox.HamburgerMenu"
           BasedOn="{StaticResource MahApps.Styles.ListBox}"
           TargetType="{x:Type ListBox}">
    <Setter "Property=Controls:ControlsHelper.Content.HamburgerMenuButton" Value="{EmbeddedIcons:PackIcon[NAME] Kind=[KIND]}" />
    ...
</Style>

<!-- WindowButtonCommands -->
<ControlTemplate x:Key="MahApps.Templates.WindowButtonCommands" TargetType="{x:Type Controls:WindowButtonCommands}">
    <StackPanel Orientation="Horizontal">
        <Button x:Name="PART_Min" Content="{Binding Path=Controls:ControlsHelper.Content.WindowMinimizeButton, RelativeSource={...}}"... >
        </Button>
        ...
    </StackPanel>
    ...
</ControlTemplate>

<Style x:Key="MahApps.Styles.WindowButtonCommands" TargetType="{x:Type Controls:WindowButtonCommands}">
    <Setter Property="Controls:ControlsHelper.Content.WindowMinimizeButton" Value="{EmbeddedIcons:PackIcon[NAME] Kind=[KIND]}" />
    ...
</Style>

This gives users a quick, easy way to override individual icons on an as-needed basis without having to recreate the templates on their own.

Additional context

N/A

MahApps / MahApps.Metro