/* Compute the scroll bar rectangle, in drawing coordinates (i.e. client coords for SB_CTL, window coords for SB_VERT and
* SB_HORZ). 'arrowSize' returns the width or height of an arrow (depending on * the orientation of the scrollbar),
* 'thumbSize' returns the size of the thumb, and 'thumbPos' returns the position of the thumb relative to the left or to
* the top. Return TRUE if the scrollbar is vertical, FALSE if horizontal.
*/
BOOL FASTCALL
IntGetScrollBarRect (PWND Wnd, INT nBar, RECTL *lprect)
{
BOOL vertical;
RECTL ClientRect = Wnd->rcClient;
RECTL WindowRect = Wnd->rcWindow;
switch (nBar)
{
case SB_HORZ:
lprect->left = ClientRect.left - WindowRect.left;
lprect->top = ClientRect.bottom - WindowRect.top;
lprect->right = ClientRect.right - WindowRect.left;
lprect->bottom = lprect->top + UserGetSystemMetrics (SM_CYHSCROLL);
vertical = FALSE;
break;
case SB_VERT:
if(Wnd->ExStyle & WS_EX_LEFTSCROLLBAR)
{
lprect->right = ClientRect.left - WindowRect.left;
lprect->left = lprect->right - UserGetSystemMetrics(SM_CXVSCROLL);
}
else
{
lprect->left = ClientRect.right - WindowRect.left;
lprect->right = lprect->left + UserGetSystemMetrics(SM_CXVSCROLL);
}
lprect->top = ClientRect.top - WindowRect.top;
lprect->bottom = ClientRect.bottom - WindowRect.top;
vertical = TRUE;
break;
case SB_CTL:
IntGetClientRect (Wnd, lprect);
vertical = ((Wnd->style & SBS_VERT) != 0);
break;
default:
return FALSE;
}
return vertical;
}
BOOL FASTCALL
IntCalculateThumb(PWND Wnd, LONG idObject, PSCROLLBARINFO psbi, PSBDATA pSBData)
{
INT Thumb, ThumbBox, ThumbPos, cxy, mx;
RECTL ClientRect;
switch(idObject)
{
case SB_HORZ:
Thumb = UserGetSystemMetrics(SM_CXHSCROLL);
cxy = psbi->rcScrollBar.right - psbi->rcScrollBar.left;
break;
case SB_VERT:
Thumb = UserGetSystemMetrics(SM_CYVSCROLL);
cxy = psbi->rcScrollBar.bottom - psbi->rcScrollBar.top;
break;
case SB_CTL:
IntGetClientRect(Wnd, &ClientRect);
if(Wnd->style & SBS_VERT)
{
Thumb = UserGetSystemMetrics(SM_CYVSCROLL);
cxy = ClientRect.bottom - ClientRect.top;
}
else
{
Thumb = UserGetSystemMetrics(SM_CXHSCROLL);
cxy = ClientRect.right - ClientRect.left;
}
break;
default:
return FALSE;
}
ThumbPos = Thumb;
/* Calculate Thumb */
if(cxy <= (2 * Thumb))
{
Thumb = cxy / 2;
psbi->xyThumbTop = 0;
psbi->xyThumbBottom = 0;
ThumbPos = Thumb;
}
else
{
ThumbBox = pSBData->page ? MINTRACKTHUMB : UserGetSystemMetrics(SM_CXHTHUMB);
cxy -= (2 * Thumb);
if(cxy >= ThumbBox)
{
if(pSBData->page)
{
ThumbBox = max(EngMulDiv(cxy, pSBData->page, pSBData->posMax - pSBData->posMin + 1), ThumbBox);
}
if(cxy > ThumbBox)
{
mx = pSBData->posMax - max(pSBData->page - 1, 0);
if(pSBData->posMin < mx)
ThumbPos = Thumb + EngMulDiv(cxy - ThumbBox, pSBData->pos - pSBData->posMin, mx - pSBData->posMin);
else
ThumbPos = Thumb + ThumbBox;
}
psbi->xyThumbTop = ThumbPos;
psbi->xyThumbBottom = ThumbPos + ThumbBox;
}
else
{
psbi->xyThumbTop = 0;
psbi->xyThumbBottom = 0;
}
}
psbi->dxyLineButton = Thumb;
return TRUE;
}
BOOL FASTCALL
IntGetScrollBarRect (PWND Wnd, INT nBar, RECTL *lprect)
{
BOOL vertical;
*lprect = Wnd->rcClient;
RECTL_vOffsetRect( lprect, -Wnd->rcWindow.left, -Wnd->rcWindow.top );
if (Wnd->ExStyle & WS_EX_LAYOUTRTL)
mirror_rect( &Wnd->rcWindow, lprect );
switch (nBar)
{
case SB_HORZ:
lprect->top = lprect->bottom;
lprect->bottom += UserGetSystemMetrics (SM_CYHSCROLL);
if (Wnd->style & WS_BORDER)
{
lprect->left--;
lprect->right++;
}
else if (Wnd->style & WS_VSCROLL)
{
lprect->right++;
}
vertical = FALSE;
break;
case SB_VERT:
if(Wnd->ExStyle & WS_EX_LEFTSCROLLBAR)
{
lprect->right = lprect->left;
lprect->left -= UserGetSystemMetrics(SM_CXVSCROLL);
}
else
{
lprect->left = lprect->right;
lprect->right += UserGetSystemMetrics(SM_CXVSCROLL);
}
if (Wnd->style & WS_BORDER)
{
lprect->top--;
lprect->bottom++;
}
else if (Wnd->style & WS_HSCROLL)
{
lprect->bottom++;
}
vertical = TRUE;
break;
case SB_CTL:
IntGetClientRect (Wnd, lprect);
vertical = !!(Wnd->style & SBS_VERT);
break;
default:
return FALSE;
}
return vertical;
}