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AddGadget.md

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NAME

AddGadget -- Add a gadget to the gadget list of a window.

SYNOPSIS

    RealPosition = AddGadget( Window, Gadget, Position )
    D0                        A0      A1      D0

    UWORD  AddGadget( struct Window *, struct Gadget *, UWORD );

Links: Window Gadget Window Gadget

FUNCTION

Adds the specified gadget to the gadget list of the given window, linked in at the position in the list specified by the position argument (that is, if Position == 0, the gadget will be inserted at the head of the list, and if Position == 1 then the gadget will be inserted after the first gadget and before the second). If the position you specify is greater than the number of gadgets in the list, your gadget will be added to the end of the list.

Calling AddGadget() does not cause your gadget to be redisplayed. The benefit of this is that you may add several gadgets without having the gadget list redrawn every time.

This procedure returns the position at which your gadget was added.

NOTE: A relatively safe way to add the gadget to the end of the list is to specify a position of -1 (i.e., (UWORD) ~0). That way, only the 65536th (and multiples of it) will be inserted at the wrong position. The return value of the procedure will tell you where it was actually inserted.

NOTE: The system window gadgets are initially added to the front of the gadget list. The reason for this is: If you position your own gadgets in some way that interferes with the graphical representation of the system gadgets, the system's ones will be "hit" first by user. If you then start adding gadgets to the front of the list, you will disturb this plan, so beware. On the other hand, if you don't violate the design rule of never overlapping your gadgets, there's no problem.

NOTE: You may not add your own gadgets to a screen. Gadgets may be added to backdrop windows, however, which can be visually similar, but also provide an IDCMP channel for gadget input messages.

INPUTS

Window = pointer to the window to get your gadget Gadget = pointer to the new gadget Position = integer position in the list for the new gadget (starting from zero as the first position in the list)

RESULT Returns the position of where the gadget was actually added.

BUGS

SEE ALSO

AddGList, RemoveGadget, RemoveGList