See: Description
| Interface | Description | 
|---|---|
| Dimension | Represents a dimension constraint for a widget. | 
| Class | Description | 
|---|---|
| DimensionHelper | Helps the dimensions to lay out a widget with a specific size. | 
| FixedDimension | Dimension with fixed width and/or height. | 
| NoDimension | Dimension without constraint. | 
| OptimalDimension | Dimension which fits the optimal size of the widget. | 
| RelativeDimension | Dimension with constraint relative to the parent. | 
The dimension allows to control the size of a widget.