Source code: https://github.com/MrSmith33/voxelman/blob/master/source/voxelman/gui

Core widget components (https://github.com/MrSmith33/voxelman/blob/master/source/voxelman/gui/components.d):

• WidgetTransform - main component of any widget. Stores parent reference, relative position, absolute position, size, min size, measured size, and extra flags
• WidgetStyle - color and border color
• WidgetName - string of widget name
• WidgetType - string of widget type (for debugging)
• WidgetContainer - children widgets
• WidgetIsFocusable - if set becomes focusedWidget on pointer press. focusedWidget will receive key and char events.
• WidgetEvents - stores handlers for any event for the widget. Typical events: