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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #!F-adobe-helvetica-medium-r-normal--18*
#!N
#!N #!Rdxccvs DXChangedComponentValues, DXChangedComponentStructure #!N #!N
Function #!N #!N Delete components of a Field. #!N #!N Syntax
#!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* #!N #include <dx/dx.h> #!N #!N Field
DXChangedComponentValues(Field f, char *component) #!N Field DXChangedComponentStructure(Field f, char *component) #!EF
#!EF #!N #!N #!EC #!N #!N Functional Details #!N #!N #!F-adobe-times-bold-r-normal--18*
DXChangedComponentValues #!EF deletes all the components of #!F-adobe-times-bold-r-normal--18* f #!EF that
have a "der" attribute naming the specified component #!F-adobe-times-bold-r-normal--18* component #!EF
. This routine is typically used when the values of the
items of an Array change (e.g., the values of the "data"
component) but not the number of items. #!N #!N #!F-adobe-times-bold-r-normal--18* DXChangedComponentStructure
#!EF deletes all the components of #!F-adobe-times-bold-r-normal--18* f #!EF that have
a "dep," "der," or "ref" attribute naming the specified component #!F-adobe-times-bold-r-normal--18*
component #!EF . This routine is typically used when the number
of items in an Array (e.g., the number of items in
the "positions" component) has been changed. #!N #!N Both of these
routines recursively apply #!F-adobe-times-bold-r-normal--18* DXChangedComponentStructure #!EF to the components they delete.
They ensure that Fields remain internally consistent when they are altered.
#!N #!N By deleting components derived from a changed component, a
call to #!F-adobe-times-bold-r-normal--18* DXChangedComponentValues #!EF ensures that the derived component will
be recalculated when necessary and will remain up-to-date. For example, the
"data statistics" component is derived from the "data" component. If the
"data" component is changed, the current contents of data statistics become
invalid. A call to #!F-adobe-times-bold-r-normal--18* DXChangedComponentValues(field, "data") #!EF will delete data
statistics, and the values will be recomputed on the next call
to #!F-adobe-times-bold-r-normal--18* DXStatistics #!EF . #!N #!N Similarly, #!F-adobe-times-bold-r-normal--18* DXChangedComponentStructure #!EF
ensures that components that depend on, refer to, or are derived
from another component will be as up-to-date as possible. For example,
the "connections" component refers to the "positions" component. If the structure
of the "positions" component is changed, perhaps by deleting a position,
the references in the "connections" component that are indices into the
"positions" component cease to apply. Rather than leave an invalid "connections"
component in the Field, it is better to remove it by
calling #!F-adobe-times-bold-r-normal--18* DXChangedComponentStructure #!EF . #!N Note: Most components depend on,
refer to, or are derived from others. These routines may cause
important information to be discarded. It is often better to correct
the component that has a "dep," "der," or "ref" attribute than
to delete it. In the example just described, you can avoid
deleting the "connections" component when a point is deleted from the
"positions" component by deleting all connections elements that refer to the
discarded position and remapping the remaining references to reflect the moved
points in the "positions" component. #!N #!N #!N Return Value #!N
#!N Returns #!F-adobe-times-bold-r-normal--18* f #!EF or returns #!F-adobe-times-bold-r-normal--18* NULL #!EF and
sets an error code. #!N #!N See Also #!N #!N #!F-adobe-times-bold-r-normal--18*
#!Ldxendf,dxall1201 h DXEndField #!EL , #!Ldxgcv,dxall1228 h DXGetComponentValue #!EL , #!Ldxscv,dxall1372 h DXSetComponentValue #!EL #!EF #!N #!N #!Lstdcs,dxall1086 h Standard Components #!EL . #!N
#!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Ldxcrih,dxall1179 h DXCheckRIH #!EL #!N #!F-adobe-times-medium-i-normal--18*
#!N
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