1999-12-08 15:04:57 +00:00
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Notes on implementation
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=======================
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The IB documentation on how object selection is managed and how editors and
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inspectors are used is unclear ... so I've gone my own way.
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1. When a document is loaded, the document object creates an editor attached
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to each top-level object in the user interface (NSMenu and NSWindow objects).
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These editors must be aware of their edited objects being clicked upon, and
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clicking on one of these should cause the corresponding editor to become the
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active editor.
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The active editor is responsible for handling selection of the edited object
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(and any objects below it in the object hierarchy). Upon change of selection,
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the editor is responsible for sending an IBSelectionChangedNotification with
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the selection owner (normally the editor itsself) as the notification owner.
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The main application watches for these notifications in order to keep track
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of who has the selection.
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1999-12-18 11:08:18 +00:00
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Connections
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===========
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The connection API is the same as that for IB, but with the extension that the
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document object must implement [-windowAndRect:forObject:] to return the
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window in which the object is being displayed, and the rectangle enclosing
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the object (in window base coordinates).
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This information is neede by Gorm so that it can mark the connection.
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The editors mananging the drag-and-drop operation for a connection must call
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[NSApp -displayConnectionBetween:and:] to tell Gorm to update its display.
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This method sets the values currently returned by
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[BSApp -connectSource] and [NSApp -connectDestination]
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