sbctl.c

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/**************************** Module Header ********************************\
* Module Name: sbctl.c
*
* Copyright (c) 1985 - 1999, Microsoft Corporation
*
* Scroll bar internal routines
*
* History:
*   11/21/90 JimA      Created.
*   02-04-91 IanJa     Revalidaion added
\***************************************************************************/

#include "precomp.h"
#pragma hdrstop

void CalcSBStuff(
    PWND pwnd,
    PSBCALC pSBCalc,
    BOOL fVert);

#define IsScrollBarControl(h) (GETFNID(h) == FNID_SCROLLBAR)

/*
 * Now it is possible to selectively Enable/Disable just one arrow of a Window
 * scroll bar; Various bits in the 7th word in the rgwScroll array indicates which
 * one of these arrows are disabled; The following masks indicate which bit of the
 * word indicates which arrow;
 */
#define WSB_HORZ_LF  0x0001  // Represents the Left arrow of the horizontal scroll bar.
#define WSB_HORZ_RT  0x0002  // Represents the Right arrow of the horizontal scroll bar.
#define WSB_VERT_UP  0x0004  // Represents the Up arrow of the vert scroll bar.
#define WSB_VERT_DN  0x0008  // Represents the Down arrow of the vert scroll bar.

#define WSB_VERT (WSB_VERT_UP | WSB_VERT_DN)
#define WSB_HORZ   (WSB_HORZ_LF | WSB_HORZ_RT)

void DrawCtlThumb(PSBWND);

/*
 * RETURN_IF_PSBTRACK_INVALID:
 * This macro tests whether the pSBTrack we have is invalid, which can happen
 * if it gets freed during a callback.
 * This protects agains the original pSBTrack being freed and no new one
 * being allocated or a new one being allocated at a different address.
 * This does not protect against the original pSBTrack being freed and a new
 * one being allocated at the same address.
 * If pSBTrack has changed, we assert that there is not already a new one
 * because we are really not expecting this.
 */
#define RETURN_IF_PSBTRACK_INVALID(pSBTrack, pwnd) \
    if ((pSBTrack) != PWNDTOPSBTRACK(pwnd)) {      \
        UserAssert(PWNDTOPSBTRACK(pwnd) == NULL);  \
        return;                                    \
    }

/*
 * REEVALUATE_PSBTRACK
 * This macro just refreshes the local variable pSBTrack, in case it has
 * been changed during a callback.  After performing this operation, pSBTrack
 * should be tested to make sure it is not now NULL.
 */
#if DBG
#define REEVALUATE_PSBTRACK(pSBTrack, pwnd, str)          \
    if ((pSBTrack) != PWNDTOPSBTRACK(pwnd)) {             \
        RIPMSG3(RIP_WARNING,                              \
                "%s: pSBTrack changed from %#p to %#p",   \
                (str), (pSBTrack), PWNDTOPSBTRACK(pwnd)); \
    }                                                     \
    (pSBTrack) = PWNDTOPSBTRACK(pwnd)
#else
#define REEVALUATE_PSBTRACK(pSBTrack, pwnd, str)          \
    (pSBTrack) = PWNDTOPSBTRACK(pwnd)
#endif

/***************************************************************************\
* HitTestScrollBar
*
* 11/15/96      vadimg          ported from Memphis sources
\***************************************************************************/

int HitTestScrollBar(