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Table of Contents
XtAllocateGC - obtain a sharable GC
with modifiable fields
- GC XtAllocateGC(Widget w, Cardinal depth,
XtGCMask
- value_mask, XGCValues *values, XtGCMask dynamic_mask, XtGCMask
unused_mask);
- values
- Specifies the actual values for this GC.
- value_mask
- Specifies
which
m.
- w
- Specifies the widget.
- depth
- Specifies the depth for which the returned
GC is valid, or 0.
- dynamic_mask
- Specifies the fields of the GC that will
be modified by the caller.
- unused_mask
- Specifies the fields of the GC that
will not be needed by the caller.
The XtAllocateGC function
returns a sharable GC that may be modified by the client. The screen field
of the specified widget or of the nearest widget ancestor of the specified
object and the specified depth argument supply the root and drawable depths
for which the GC is to be valid. If depth is zero the depth is taken from
the depth field of the specified widget or of the nearest widget ancestor
of the specified object.
The value_mask argument specifies the fields of
the GC that will be initialized with the respective members of the values
structure. The dynamic_mask argument specifies fields that the caller intends
to modify during program execution. The caller must ensure that the corresponding
GC field is sdet prior to each use of the GC. The unused_mask argument specifies
fields of the GC that are of no interest to the caller. The caller may make
no assumptions about the contents of any fields specified in unused_mask.
The caller may assume that at all times all fields not specified in either
dynamic_mask or unused_mask have their default value if not specified in
value_mask or the value specified by values. If a field is specified in
both value_mask and dynamic_mask, the effect is as if it were specified
only in dynamic_mask and then immediately set to the value in values. If
a field is set in unused_mask and also in either value_mask or dynamic_mask,
the specification in unused_mask is ignored.
XtAllocateGC tries to minimize
the number of unique GCs created by comparing the arguments with those
of previous calls and returning an existing GC when there are no conflicts.
XtAllocateGC may modify and return an existing GC if it was allocated
with a nonzero unused_mask.
XtGetGC
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
Table of Contents
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