Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 583)

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CHAPTER 15

Filing

Using the Filing Service 15-17

perform any other actions that are appropriate, such as redrawing views affected by

the change in ﬁling ﬁlter.

The symbol passed as the sole argument to your

NewFilingFilter method

speciﬁes which of the

storesFilter or labelsFilter slots changed in value.

This argument does not specify the slot’s new value, however. Your

NewFilingFilter method must use the current value of the specified slot to

retrieve those soup entries that fall into the new ﬁling category.

The following code example shows the implementation of a typical

NewFilingFilter method, which queries the application soup for the entries

that match the current ﬁling category and then redraws views affected by the

change in ﬁling category.

NewFilingFilter: func(newFilterPath)

begin

// first figure out if query should be done on

// a union soup or on a specific store soup

// this is to make filter by store more efficient

local querySoup := GetUnionSoupAlways(kSoupName) ;

if storesFilter and storesFilter:IsValid() then

querySoup := querySoup:GetMember(storesFilter) ;

// now construct the query based on the labelsFilter

// and set my application cursor (called myCursor)

// to the new query

// the default is to show all items, i.e.,

// labelsFilter is '_all

local theQuery := nil ;

if NOT labelsFilter then

// labelsFilter is NIL, so show only those entries

// that do not have a valid tag in the labels

// slot

theQuery := {none: GetFolderList(appSymbol, nil)};

else if labelsFilter <> '_all then

// labelsFilter is some specific folder

theQuery := {all: labelsFilter} ;

myCursor := querySoup:Query(theQuery) ;

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Apple Newton Utilities Guide de l'utilisateur Page 583

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