scrollbox.cpp File Reference

#include "precomp.h"
#include <atltypes.h>

Include dependency graph for scrollbox.cpp:

Go to the source code of this file.

Classes
struct	ScrollbarPresence

Functions
void	UpdateScrollbox ()

Variables
CONST ScrollbarPresence	sp_mx [3][3]
CONST INT	HSCROLL_WIDTH = ::GetSystemMetrics(SM_CYHSCROLL)
CONST INT	VSCROLL_WIDTH = ::GetSystemMetrics(SM_CXVSCROLL)

Function Documentation

UpdateScrollbox()

void UpdateScrollbox

(

)

Definition at line 53 of file scrollbox.cpp.

Referenced by CScrollboxWindow::OnSize(), and CImgAreaWindow::OnSize().

{
    CONST INT EXTRASIZE = 5; /* 3 px of selection markers + 2 px of border */

    CRect tempRect;
    CSize sizeImageArea;
    CSize sizeScrollBox;
    INT vmode, hmode;
    SCROLLINFO si;

    scrollboxWindow.GetWindowRect(&tempRect);
    sizeScrollBox = CSize(tempRect.Width(), tempRect.Height());

    imageArea.GetClientRect(&tempRect);
    sizeImageArea = CSize(tempRect.Width(), tempRect.Height());
    sizeImageArea += CSize(EXTRASIZE * 2, EXTRASIZE * 2);

    /* show/hide the scrollbars */
    vmode = (sizeScrollBox.cy < sizeImageArea.cy ? 0 :
                (sizeScrollBox.cy < sizeImageArea.cy + HSCROLL_WIDTH ? 1 : 2));
    hmode = (sizeScrollBox.cx < sizeImageArea.cx ? 0 :
                (sizeScrollBox.cx < sizeImageArea.cx + VSCROLL_WIDTH ? 1 : 2));
    scrollboxWindow.ShowScrollBar(SB_VERT, sp_mx[vmode][hmode].bVert);
    scrollboxWindow.ShowScrollBar(SB_HORZ, sp_mx[vmode][hmode].bHoriz);

    si.cbSize = sizeof(SCROLLINFO);
    si.fMask  = SIF_PAGE | SIF_RANGE;
    si.nMin   = 0;

    si.nMax   = sizeImageArea.cx +
                    (sp_mx[vmode][hmode].bVert == TRUE ? HSCROLL_WIDTH : 0);
    si.nPage  = sizeScrollBox.cx;
    scrollboxWindow.SetScrollInfo(SB_HORZ, &si);

    si.nMax   = sizeImageArea.cy +
                    (sp_mx[vmode][hmode].bHoriz == TRUE ? VSCROLL_WIDTH : 0);
    si.nPage  = sizeScrollBox.cy;
    scrollboxWindow.SetScrollInfo(SB_VERT, &si);

    scrlClientWindow.MoveWindow(-scrollboxWindow.GetScrollPos(SB_HORZ),
                                -scrollboxWindow.GetScrollPos(SB_VERT),
                                sizeImageArea.cx, sizeImageArea.cy, TRUE);
}

Variable Documentation

HSCROLL_WIDTH

CONST INT HSCROLL_WIDTH = ::GetSystemMetrics(SM_CYHSCROLL)

Definition at line 46 of file scrollbox.cpp.

Referenced by UpdateScrollbox().

sp_mx

CONST ScrollbarPresence sp_mx[3][3]

Initial value:

=
{
    { {  TRUE,TRUE  }, {  TRUE,TRUE  }, {  TRUE,FALSE } },
    { {  TRUE,TRUE  }, { FALSE,FALSE }, { FALSE,FALSE } },
    { { FALSE,TRUE  }, { FALSE,FALSE }, { FALSE,FALSE } }
}

Definition at line 39 of file scrollbox.cpp.

Referenced by UpdateScrollbox().

VSCROLL_WIDTH

CONST INT VSCROLL_WIDTH = ::GetSystemMetrics(SM_CXVSCROLL)

Definition at line 47 of file scrollbox.cpp.

Referenced by UpdateScrollbox().