/*********************************************************************
*
* LISTVIEW__UpdateScrollPos
*
* Purpose:
* Checks whether if we must scroll up or scroll down to ensure
* that selection is in the visible area. This function also
* makes sure that scroll positions are in valid ranges.
*
* Return value:
* Difference between old and new vertical scroll pos.
*/
int LISTVIEW__UpdateScrollPos(LISTVIEW_Handle hObj, LISTVIEW_Obj* pObj) {
int PrevScrollStateV;
PrevScrollStateV = pObj->ScrollStateV.v;
if (pObj->Sel >= 0) {
WM_CheckScrollPos(&pObj->ScrollStateV, pObj->Sel, 0, 0);
} else {
WM_CheckScrollBounds(&pObj->ScrollStateV);
}
WM_CheckScrollBounds(&pObj->ScrollStateH);
WIDGET__SetScrollState(hObj, &pObj->ScrollStateV, &pObj->ScrollStateH);
return pObj->ScrollStateV.v - PrevScrollStateV;
}
/*********************************************************************
*
* _UpdateScrollPos
*
* Purpose:
* Checks whether if we must scroll up or scroll down to ensure
* that selection is in the visible area. This function also
* makes sure that scroll positions are in valid ranges.
*
* Return value:
* Difference between old and new vertical scroll pos.
*/
static int _UpdateScrollPos(LISTBOX_Handle hObj, LISTBOX_Obj* pObj) {
int PrevScrollStateV;
PrevScrollStateV = pObj->ScrollStateV.v;
if (pObj->Sel >= 0) {
/* Check upper limit */
if (_IsPartiallyVis(hObj, pObj)) {
pObj->ScrollStateV.v = pObj->Sel - (pObj->ScrollStateV.PageSize - 1);
}
/* Check lower limit */
if (pObj->Sel < pObj->ScrollStateV.v) {
pObj->ScrollStateV.v = pObj->Sel;
}
}
WM_CheckScrollBounds(&pObj->ScrollStateV);
WM_CheckScrollBounds(&pObj->ScrollStateH);
WIDGET__SetScrollState(hObj, &pObj->ScrollStateV, &pObj->ScrollStateH);
return pObj->ScrollStateV.v - PrevScrollStateV;
}
static void _SetScrollState(WM_HWIN hWin) {
LISTBOX_Obj* pObj = LISTBOX_H2P(hWin);
WIDGET__SetScrollState(hWin, &pObj->ScrollState, NULL);
}
