AbstractControlBar

FindSlotNumber FirstEmptySlot InstallInto InstallIntoSlot SlotContents

Attributes

ButtonCount

Fields

Define Class AbstractControlBar;
    mixes in with Object;

    attribute ButtonCount: Unsigned, noGetter, noSetter;
        // The number of buttons in the control bar.
    
    operation FindSlotNumber(item: Viewable) : Unsigned, noMethod;
        // Return the slot number of the item specified,
        // or return 0 if the item could not be found in the control bar.
        // Must override.
    operation SlotContents(slotNumber: Unsigned) : Viewable, noMethod;
        // Return the item that lives in the specified slot number.
        // Return nilObject if the slot is empty.
        // Must override.
    operation InstallIntoSlot(newItem: Viewable; slotNumber: Unsigned), noMethod;
        // Install a new item into the control bar.
        // Must override.

    operation FirstEmptySlot() : Unsigned;
        // Returns the slot number of the first unoccupied slot.
        // Sometimes override to implement more efficiently.
    overrides InstallInto;
        // Installs a new item into the control bar using
        // InstallIntoSlot.  If the new item is a control bar gadget,
        // this method asks the gadget for its preferred slot
        // number.  Otherwise, the first empty slot is chosen.
        // Rarely override.
end class;