MoveControl

Change the position of a control

#include <Controls.h> Control Manager

void MoveControl( theControl, toHoriz, toVert );

ControlHandle theControl ; handle of control to move

short toHoriz ; horizontal position, in local coordinates

short toVert ; vertical position, in local coordinates

MoveControl changes the position of a control. Call it to update the position

of scroll bars when you horizontally re-size a window.

theControl is a handle leading to a variable-length ControlRecord structure. It

specifies which control to move.

toHoriz and . . .

toVert specify the new position for the control. The control will be drawn

with its top left corner at this coordinate pair, expressed in local

coordinates.

Notes: MoveControl changes the position of theControl by erasing it, off setting

the contrlRect field of its ControlRecord, and redrawing it at the new

position.

You will use this in a sequence that sizes a window. The SizeWindow

function does not move controls; so after sizing a window, scroll bars

remain somewhere in the middle of the window or at invalid coordinates

outside of the window. A normal window-sizing function ( executed upon

getting an inGrow return value from FindWindow after a mouseDown

event from WaitNextEvent) will contain these elements:

GrowWindow drag a gray window outline

InvalRect prepare for an update event on the contents

MoveControl reposition scroll bars to match window

SizeControl make scroll bars longer or shorter

UpdtMyWndo() update contents of window

DrawControls (may be needed if controls erased by update)

Controls normally remain stationary relative to their enclosing window,

but if you should need to let the user move one or move a control indicator,

you may use DragControl.

Referenced by (13):