|
|
| (2 intermediate revisions by 2 users not shown) |
| Line 1: |
Line 1: |
| <span style="font-size:120%; color:black"><b><section begin=dpl_desc/>Return num<section end=dpl_desc/></b></span>
| | #REDIRECT [[FindPreviousItemNumber (GenericNamedArraylist function)]] |
| [[Category:FloatNamedArraylist methods|FindPreviousItemNumber function]]
| |
| <!--DPL?? Category:FloatNamedArraylist methods|FindPreviousItemNumber function: Return num-->
| |
| <p>
| |
| FindPreviousItemNumber is a member of the [[FloatNamedArraylist class]].
| |
| </p>
| |
| | |
| This function searches “backward” in the FloatNamedArraylist to find and
| |
| return the item number of the next item that matches a specified criterion.
| |
| The criterion is supplied by the [[SelectionCriterion class|SelectionCriterion]] object
| |
| that is a required FindPreviousItemNumber parameter.
| |
| If no item satisfies the criterion,
| |
| the method returns a zero.
| |
| | |
| FindPreviousItemNumber is available in ''Sirius Mods'' version 7.6 and later.
| |
| ==Syntax==
| |
| %itemnum = %fnamrayl:FindPreviousItemNumber(criterion -
| |
| [, Start=itemnum])
| |
| ===Syntax Terms===
| |
| <dl>
| |
| <dt><i>%itemnum</i>
| |
| <dd>A numeric variable to contain the item number of the
| |
| item that is located by the search.
| |
| <dt><i>%fnamrayl</i>
| |
| <dd>A FloatNamedArraylist object.
| |
| <dt><i>criterion</i>
| |
| <dd>A SelectionCriterion object, which is a relational expression that is
| |
| applied to a ''%fnamrayl'' item value to determine
| |
| whether the value satisfies the expression.
| |
| The expression consists of a function, an operator, and a numeric or string value.
| |
| | |
| For example, <tt>LT(this, 1)</tt> is the
| |
| criterion <tt>this</tt> <tt><</tt> <tt>1</tt>, where
| |
| <tt>this</tt> is an identity function that simply returns the item's value.
| |
| The item number of the first item tested by FindPreviousItemNumber that satisfies
| |
| this expression is the method's return value.
| |
| | |
| The function in the criterion is
| |
| a method value (a method or class member name literal, or a method variable)
| |
| for a method
| |
| that operates on items of the type specified on the ''%fnamrayl''
| |
| declaration and that returns a numeric or string value.
| |
| This is described further in "[[SelectionCriterion class#Specifying a SelectionCriterion's parameters|Specifying a SelectionCriterion's parameters]]".
| |
| <dt><b>Start=</b><i> itemnum</i>
| |
| <dd>The number of the item ''before'' which to begin the search.
| |
| If the ''itemnum'' value of Start is 4, item 3 is the first item considered.
| |
| The value of Start may be 1 through one plus the number of items in
| |
| the FloatNamedArraylist.
| |
| For a collection of three items, ''itemnum'' may be 1, 2, 3, or 4.
| |
| | |
| This is an optional argument, and it defaults to one plus the number of items in
| |
| the FloatNamedArraylist.
| |
| If you specify a value, the parameter name <tt>Start</tt> is required.
| |
| | |
| </dl>
| |
| ==Usage Notes==
| |
| <ul>
| |
| <li>If the value of Start is not in the range of 2 through one plus the number
| |
| of items in the FloatNamedArraylist, the request is cancelled.
| |
| If the value of Start is 1, no item can be found and
| |
| the method returns a zero.
| |
| <li>[[FindNextItemNumber (FloatNamedArraylist function)|FindNextItemNumber]]
| |
| is identical to FindPreviousItemNumber except that it searches forward in
| |
| the FloatNamedArraylist.
| |
| </ul>
| |
| ==Examples==
| |
| | |
| See the [[FindNextItemNumber (FloatNamedArraylist function)#Examples|FindNextItemNumber example]] refid=fnxixm2. for an example with a FindPreviousItemNumber call.
| |