Use the Glow to enable drop shadow (EnableDWMDropShadow)

[punker76]

after this pr it's possible to have

• border
  • BorderBrush="{DynamicResource AccentColorBrush}"
• glow with border
  • GlowBrush="{DynamicResource AccentColorBrush}"
• glow without border
  • BorderThickness="0"
  • GlowBrush="{DynamicResource AccentColorBrush}"
• drop shadow
  • BorderThickness="0"
  • GlowBrush="Black"
• or drop shadow with
  • EnableDWMDropShadow="True"

Closes Window loses shadow [EnableDWMDropShadow] #1791

[punker76]

@flagbug agreed with this?
/CC @thoemmi @AdditionalPylons

[thoemmi]

Looks ok to me. However, this is a breaking change for applications using EnableDWMDropShadow. Maybe you should add a change handler to EnableDWMDropShadowProperty which, when the property is set to true, sets BorderThickness="0" and GlowBrush="Black".

[punker76]

@thoemmi thx, i also thought about the change handler after did the PR ;-)

[flagbug]

Works for me 👍

[thoemmi]

I would have kept the ObsoleteAttribute on MetroWindow.EnableDWMDropShadow. It's still working under the hood so it's not broken, but users of MahApps.Metro should update their code to set BorderThickness="0" and GlowBrush="Black" directly.

[punker76]

@thoemmi agreed 9ded780