Guidelines provide additional elements to which constraints may be anchored. Guidelines are added by right-clicking on the layout and selecting either the Vertical Guideline or Horizontal Guideline menu option or using the toolbar menu options as shown in Figure 19-29:
Alternatively, horizontal and vertical Guidelines may be dragged from the Helpers section of the Palette and dropped either onto the layout canvas or Component Tree panel:
Figure 19-30
Once added, a guideline will appear as a dashed line in the layout and may be moved simply by clicking and dragging the line. To establish a constraint connection to a guideline, click in the constraint handler of a widget and drag to the guideline before releasing. In Figure 19-31, the left sides of two Buttons are connected by constraints to a vertical guideline.
The position of a vertical guideline can be specified as an absolute distance from either the left or the right...
