Universal C++ GUI Framework.
This is a fully featured and usable GUI framework on a D2D1 Renderer. All you need to do is change the drawing functions to your desired renderer.
For an Xbox Gamebar Implementation

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• Input Management
  • Character Input
  • Keyboard Press Up, Keyboard Press Down
  • Mouse Press Up, Mouse Press Down
  • Relative Window Mouse Position
• Drawing System
  • Circles
  • Rectangles
  • Gradient Rectangles
  • Triangles
  • Text
  • Clipped Text
  • Rounded Rectangle
  • Lines
  • Bitmap Rendering
• Font System
  • Create Fonts
  • Retrieve Fonts From Dictionary
  • Measure Text Width
  • Measure Text Height
• GUI Framework
  • Toggle
  • Slider(Templated)
    • Int
    • Float
    • Double
  • Button
  • TextBox
    • Select Text(Select Regions Of Text)
    • Copy Text (Copy A Region Of Text)
    • Paste Text (Paste At Point)
    • Delete Text (Delete Character Or Region Of Text)
  • Label
  • Tabs
  • List Box Tabs
    • Scroll Bar To Navigate Many Tabs
    • Text Culling / Revealing
  • Group Box
    • Scroll Bar to Navigate Many Elements
    • Dynamic Size To Fit Text
    • Text Culling
  • Combo Box
    • Scroll Bar To Navigate
    • Dynamic Size To Fit Text
    • Text Culling
  • Event Handler
    • Value Changed Event