checkPreconditions method
dynamic
checkPreconditions()
Implementation
checkPreconditions() {
assert(!multipleSelection || doneButton != null);
assert(menuConstraints == null || !dialogBox);
assert(itemsPerPage == null || currentPage != null,
"currentPage must be given if itemsPerPage is given");
assert(
dropDownDialogPadding == null || buildDropDownDialog == null,
"buildDropDownDialog and dropDownDialogPadding cannot be set at" +
" the same time");
assert(dialogBox || dropDownDialogPadding == null,
"dropDownDialogPadding must be null if dialogBox == false");
assert(
futureSearchOrderOptions == null || futureSearchFn != null,
"futureSearchOrderOptions is of no use if futureSearchFn is not " +
"set");
assert(
futureSearchFilterOptions == null || futureSearchFn != null,
"futureSearchFilterOptions is of no use if futureSearchFn is not " +
"set");
assert(futureSearchFn == null || searchFn == null,
"futureSearchFn and searchFn cannot work together");
assert((futureSearchFn == null) != (items == null),
"must either have futureSearchFn or items but not both");
assert(
futureSearchFn == null ||
(multipleSelection
? (futureSelectedValues != null && value == null)
: (true && futureSelectedValues == null)),
"${multipleSelection ? "futureSelectedValues" : "value"} must be " +
"set if futureSearchFn is set in " +
"${multipleSelection ? "multiple" : "single"} selection mode " +
"while " +
"${multipleSelection ? "value" : "futureSelectedValues"} " +
"must not be set");
assert(fieldDecoration == null || underline == null,
"use either underline or fieldDecoration");
assert(fieldPresentationFn == null || underline == null,
"use either underline or fieldPresentationFn");
assert(fieldDecoration == null || padding == null,
"use either padding or fieldDecoration");
assert(fieldPresentationFn == null || padding == null,
"use either padding or fieldPresentationFn");
assert(dialogBox || showDialogFn == null,
"use showDialogFn only with dialogBox");
}