• AbstractButton - Shared state for clickable buttons.
• Brush - Fill configuration that can be applied to a `Painter`.
• Button - Push button widget.
• CheckBox - Check box widget.
• Color - RGBA color used by `Painter`, `Pen` and `Brush`.
• ComboBox - Themed drop-down selection field.
• ComboxBox - Legacy compatibility alias kept for the historical filename typo.
• Container - A container stores child widgets and optionally owns a layout.
• Dialog - Base dialog window.
• Gradient - Base class for paint gradients.
• GradientStop - Single color stop used by gradients.
• Graphics - Backward-compatible alias for `Painter`.
• Icon - Minimal icon descriptor.
• ImagePattern - Repeated image paint, similar to `CanvasPattern`.
• Label - Static text label.
• LinearGradient - Linear gradient compatible with a canvas-style API.
• MainWindow - Main application window.
• Menu - A drop-down menu.
• MenuBar - Menu bar of a window.
• MenuItem - Single menu entry.
• Painter - Immediate-mode drawing context for widgets.
• Pen - Stroke configuration that can be applied to a `Painter`.
• RadialGradient - Radial gradient compatible with a canvas-style API.
• RadioButton - Radio button widget.
• SpinBox - Numeric spin box widget.
• TextBox - Editable text field.
• TextMetrics - Result of `Painter.
• ToggleButton - Toggle button widget.
• WebComponent - Placeholder for an embeddable web component.
• Widget - Base class for the window widgets.
• Window - Base class for graphical windows.