Set the horizontal base added to displacement from the drag-start mouse

position.

WORD; set only in this implementation. Default zero.

Values convert to WORD without validation. Initialization is not

consumed and the header-advertised getter is absent. The base is read

afresh on each mouse move; it is not automatically advanced after

release. Set a new base before a later drag when your application needs

cumulative movement.

Return the corresponding internal pointer field, which this

implementation never assigns.

Object pointer; get only.

The normal result is NULL with TRUE getter status. No Prop object is

constructed, attached, borrowed or controlled through this field. There

is no setter or initialization handling; this declaration is not a

working scroller association API.

Return the last packed drag position: horizontal UWORD in bits 31..16

and vertical UWORD in bits 15..0.

ULONG; get and notification output.

Initial value is zero. Mouse movement while Selected updates storage

before issuing the setter that triggers notifications. Decode the two

halves explicitly; interpret them as signed WORD only if your

application uses signed coordinates. External setting does not update

the stored position because the local setter has no case for it. No

automatic range clamp or Prop update occurs.

Set the vertical base added to displacement from the drag-start mouse

position.

WORD; set only in this implementation. Default zero.

Values convert to WORD without validation. Initialization is not

consumed and the header-advertised getter is absent. The base is read

afresh on each mouse move; it is not automatically advanced after

release. Set a new base before a later drag when your application needs

cumulative movement.

Return the corresponding internal pointer field, which this

implementation never assigns.

Object pointer; get only.

The normal result is NULL with TRUE getter status. No Prop object is

constructed, attached, borrowed or controlled through this field. There

is no setter or initialization handling; this declaration is not a

working scroller association API.

Area.mui

Provide a drag-position control that reports two coordinates packed into

NewPosition. Construction prepends ButtonFrame, RelVerify InputMode and

ButtonBack background; later caller tags can override them. The class

creates or owns no Prop objects and installs no automatic scrolling

connection.

Setup first sets up Area and registers its own mouse-button handler.

SELECTDOWN inside the object enables mouse-move events, sets Selected

TRUE and records the mouse origin. Any later non-SELECTDOWN button event

removes mouse-move tracking and clears Selected. While selected, mouse

moves add displacement to the stored Horiz/Vert bases, pack the result

and issue a NewPosition setter for notifications.

Setup returns FALSE on Area failure, otherwise TRUE without checking

event registration. Cleanup removes its handler, invokes Area Cleanup

and returns zero. HandleEvent returns zero and does not delegate to

Area. AskMinMax adds two to each minimum/default and MUI_MAXMAX to each

maximum, returning zero; this addition is not a validated maximum clamp.

Pair Setup/Cleanup and normal Area Show/Hide before disposal. Use

application notifications to translate NewPosition into content or Prop

setters. HorizProp and VertProp getters return unassigned instance

pointers, normally NULL; they do not identify connected scrollers.

Horiz/Vert setters store WORD bases but no local getters exist, contrary

to the header. Initialization tags for those bases are not consumed. The

drag handler reads bases on every move, so changing them mid-drag

affects subsequent positions. There is no clamping to a content range;

each packed component wraps as UWORD.