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.