Volume 6A: Motif Programming Manual

Output of paned_win1.c

9.7.1 Pane Constraints

One problem with setting the maximum and minimum resources for a widget involves determining exactly what those

extents should be. The maximum size of 45 for the Label widgets in the source code is an arbitrary value that was

selected for demonstration purposes only. If other resources had been set on one of the Labels such that the widget

needed to be larger, the application would definitely look unbalanced. For example, an extremely high resolution

monitor might require the use of unusually large fonts in order for text to appear normal. There are two choices

available at this point. One is to specify the maximum and minimum values in a resolution−independent way and the

other is to ask the Label widget itself what height it wants to be.

Specifying resolution−independent dimensions requires you to carefully consider the type of application you are

creating. When you specify resolution−independent values, you must specify the values in either millimeters, inches,

points, or font units. The value of the XmN-unit-Type Manager resource controls the type of units that are used.

the source code demonstrates the use of resolution−independent dimensions. XtSetLanguageProc() is only

available in X11R5; there is no corresponding function in X11R4.

/* unit_types.c −−the same as paned_win1.c except that the

* Labels' minimum and maximum sizes are set to 1/4 inch and

* 1/2 inch respectively. These measurements are retained

* regardless of the pixels−per−inch ...