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scroller_gc
--datasheet--
SCROLLER_GetClass
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scroller_gc -- create scroller BOOPSI objects
gadgetclass
bevel.image, glyph.image
The scroller gadget is a propgclass wrapper class and is used
to create proportional scroller or linear slider gadgets.
To create a linear slider, SCROLLER_Visible must be set to 1, and
SCROLLER_Top will range in value from 0 to SCROLLER_Total - 1.
The IntuiMessage.Code field will contain the SCROLLER_Top
attribute, cast to a WORD.
Advantages that this class provides are:
> Supports window relativity.
> Supports OS 3.0 BOOPSI Notification/Update.
> Special signaling ability.
> Optional scroller arrow buttons.
> Supports usage in window boarders.
OM_NEW -- Create the scroller gadget. Also allocates an
instance of the bevel and glyph image classes.
Passed to superclass then calls OM_SET.
OM_SET -- Set object attributes. Passed to superclass first.
OM_DISPOSE -- Frees up the scroller gadget as well as the
bevel and glyph image instances. Passed to superclass last.
OM_UPDATE -- Set object notification attributes. Passed to
superclass first.
GM_RENDER -- Renders the gadget imagery. Overrides the superclass.
GM_GOACTIVE -- Handles activation. Overrides the superclass.
GM_HANDLEINPUT -- Handles input events once active. Overrides
the superclass.
GM_GOINACTIVE -- Overrides the superclass. Handles deactivation.
GM_HELPTEST -- Test if mouse is within gadget hit area.
GM_HITTEST -- Test if mouse is within gadget hit area.
GM_DOMAIN -- Returns GDOMAIN_MINIMUM and GDOMAIN_MAXIMUM dimensions.
All other methods are passed to the superclass.
SCROLLER_Top (LONG)
Set the current top value of the scroller within the
proportional range. (V40)
Applicability is (OM_NEW, OM_SET, OM_UPDATE, OM_GET)
SCROLLER_Visible (LONG)
Set the visible portion of the proportional range. (V40)
(OM_NEW, OM_SET, OM_UPDATE, OM_GET)
SCROLLER_Total (LONG)
Set the total range of the scroller. (V40)
Applicability is (OM_NEW, OM_SET, OM_UPDATE, OM_GET)
SCROLLER_Orientation
Define orientation of the scroller.
Accepted values as defined in <gadgets/scroller.h> are:
SORIENT_VERT
SORIENT_HORIZ
Defines are found in <gadgets/scroller.h> and are synomyms for
the propgclass FREEVERT and FREEHORIZ. (V40)
Applicability is (OM_NEW, OM_GET)
SCROLLER_Arrows (BOOL)
Enable rendering of optional scroller arrows. (V40)
Applicability is (OM_NEW, OM_GET)
SCROLLER_ArrowDelta (WORD) (V41)
Allows you to change the amount that clicking an arrow causes
the scroller to move by.
Defaults to 1.
Applicability is (OM_NEW, OM_SET, OM_UPDATE, OM_GET)
SCROLLER_SignalTask (struct Task *) (V42)
Signal the specified Task while scroller is active. This is
very useful to reduce the load on input.device because you can
render from some other task (application, or anything else)
that waits for this signal and then GetAttr() SCROLLER_Top, etc.
Defaults to NULL (no signaling).
Applicability is (OM_NEW, OM_SET)
SCROLLER_SignalTaskBit (ULONG) (V42)
Signal with this Bit. See also; SCROLLER_SignalTask.
Applicability is (OM_NEW, OM_SET)
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