Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 584)

100

101

CHAPTER 15

Filing

15-18 Using the Filing Service

// now redraw views affected by the change

// NOTE: You could keep track of the original

// labelsFilter and storesFilter to see

// whether you need to actually do work.

end

Using the Folder Change Notiﬁcation Service 15

You can use the RegFolderChanged global function to register callback

functions that are executed when the user adds, removes, or edits folders. Most

applications register these functions only while the application is actually open, so

the application base view’s

ViewSetupFormScript is an ideal place from which

to call the

RegFolderChanged function. For example,

myCallback1 := func(oldFolder,newFolder);

begin

// retag entries

end;

myAppBase.viewSetupFormScript := func ()begin

RegFolderChanged('|myFnId1:myApp:mySig|, myCallback1);

end;

The UnRegFolderChanged function removes a speciﬁed callback from use by

the folder change mechanism. Most applications unregister their folder change

callback functions when they close, making the application base view’s

ViewQuitScript method an appropriate place to unregister folder change

callback functions. For example,

myAppBase.viewQuitScript := func ()begin

UnRegFolderChanged('|myFnId1:myApp:mySig|);

end;

Creating the doCardRouting slot 15

If you want to move items between stores from within the Filing slip, you need to

create a

doCardRouting slot in your application’s base view. When an external

store is available and the value of this slot is non-

nil, the Filing slip displays

buttons allowing the user to route the target to a speciﬁed destination store. If this

slot has a non-

nil value but no external store is available, these “card-routing”

buttons are not displayed.

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