BOOL CTreeOptionsCtrlEx::SetRadioButton(HTREEITEM hItem)
{
//Validate our parameters
ASSERT(IsRadioButton(hItem)); //Must be a radio item to check it
//Iterate through the sibling items and turn them all off except this one
HTREEITEM hParent = GetNextItem(hItem, TVGN_PARENT);
ASSERT(IsGroup(hParent)); //Parent item must be a group item
//Iterate through the child items and turn on the specified one and turn off all the other ones
HTREEITEM hChild = GetNextItem(hParent, TVGN_CHILD);
//Turn of redraw to Q all the changes we're going to make here
SetRedraw(FALSE);
while (hChild)
{
//if we reach a non radio button then break out of the loop
if (!IsRadioButton(hChild))
break;
if (hChild == hItem)
{
//Turn this item on
BOOL bOldState;
GetRadioButton(hChild, bOldState);
BOOL bSuccess = SetItemImage(hChild, 3, 3);
ASSERT(bSuccess);
if (!bOldState)
NotifyParent(BN_CLICKED, hChild);
}
else
{
BOOL bEnable;
VERIFY(GetRadioButtonEnable(hChild, bEnable));
//Turn this item off
if (bEnable)
VERIFY(SetItemImage(hChild, 2, 2));
else
VERIFY(SetItemImage(hChild, 6, 6));
}
//Move on to the next item
hChild = GetNextItem(hChild, TVGN_NEXT);
}
//Reset the redraw flag
SetRedraw(TRUE);
return TRUE;
}
BOOL CTreeOptionsCtrlEx::SetRadioButton(HTREEITEM hParent, int nIndex)
{
//Validate our parameters
ASSERT(IsGroup(hParent)); //Parent item must be a group item
//Iterate through the child items and turn on the specified one and turn off all the other ones
HTREEITEM hChild = GetNextItem(hParent, TVGN_CHILD);
//Turn of redraw to Q all the changes we're going to make here
SetRedraw(FALSE);
int i=0;
BOOL bCheckedSomeItem = FALSE;
while (hChild)
{
//if we reach a non radio button then break out of the loop
if (!IsRadioButton(hChild))
break;
if (i == nIndex)
{
//Turn this item on
BOOL bOldState;
GetRadioButton(hChild, bOldState);
VERIFY(SetItemImage(hChild, 3, 3));
bCheckedSomeItem = TRUE;
if (!bOldState)
NotifyParent(BN_CLICKED, hChild);
}
else
{
BOOL bEnable;
VERIFY(GetRadioButtonEnable(hChild, bEnable));
//Turn this item off
if (bEnable)
VERIFY(SetItemImage(hChild, 2, 2));
else
VERIFY(SetItemImage(hChild, 4, 4));
}
//Move on to the next item
hChild = GetNextItem(hChild, TVGN_NEXT);
++i;
}
ASSERT(bCheckedSomeItem); //You specified an index which does not exist
//Reset the redraw flag
SetRedraw(TRUE);
return TRUE;
}
