wxSize wxChoice::DoGetBestSize() const
{
// find the widest string
int wChoice = 0;
int hChoice;
const unsigned int nItems = GetCount();
for ( unsigned int i = 0; i < nItems; i++ )
{
int wLine;
GetTextExtent(GetString(i), &wLine, NULL);
if ( wLine > wChoice )
wChoice = wLine;
}
// give it some reasonable default value if there are no strings in the
// list
if ( wChoice == 0 )
wChoice = 100;
// the combobox should be slightly larger than the widest string
wChoice += 5*GetCharWidth();
if( HasFlag( wxCB_SIMPLE ) )
{
hChoice = SetHeightSimpleComboBox( nItems );
}
else
hChoice = EDIT_HEIGHT_FROM_CHAR_HEIGHT(GetCharHeight());
wxSize best(wChoice, hChoice);
CacheBestSize(best);
return best;
}
wxSize wxChoice::DoGetSizeFromTextSize(int xlen, int ylen) const
{
int cHeight = GetCharHeight();
// We are interested in the difference of sizes between the whole control
// and its child part. I.e. arrow, separators, etc.
wxSize tsize(xlen, 0);
// FIXME-VC6: Only VC6 needs this guard, see WINVER definition in
// include/wx/msw/wrapwin.h
#if defined(WINVER) && WINVER >= 0x0500
WinStruct<COMBOBOXINFO> info;
if ( MSWGetComboBoxInfo(&info) )
{
tsize.x += info.rcItem.left + info.rcButton.right - info.rcItem.right
+ info.rcItem.left + 3; // right and extra margins
}
else // Just use some rough approximation.
#endif // WINVER >= 0x0500
{
tsize.x += 4*cHeight;
}
// set height on our own
if( HasFlag( wxCB_SIMPLE ) )
tsize.y = SetHeightSimpleComboBox(GetCount());
else
tsize.y = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cHeight);
// Perhaps the user wants something different from CharHeight
if ( ylen > 0 )
tsize.IncBy(0, ylen - cHeight);
return tsize;
}
void wxChoice::DoSetSize(int x, int y,
int width, int height,
int sizeFlags)
{
const int heightBest = GetBestSize().y;
// we need the real height below so get the current one if it's not given
if ( height == wxDefaultCoord )
{
// height not specified, use the same as before
DoGetSize(NULL, &height);
}
else if ( height == heightBest )
{
// we don't need to manually manage our height, let the system use the
// default one
m_heightOwn = wxDefaultCoord;
}
else // non-default height specified
{
// set our new own height but be careful not to make it too big: the
// native control apparently stores it as a single byte and so setting
// own height to 256 pixels results in default height being used (255
// is still ok)
m_heightOwn = height;
if ( m_heightOwn > UCHAR_MAX )
m_heightOwn = UCHAR_MAX;
// nor too small: see MSWUpdateVisibleHeight()
else if ( m_heightOwn < COMBO_HEIGHT_ADJ )
m_heightOwn = COMBO_HEIGHT_ADJ;
}
// the height which we must pass to Windows should be the total height of
// the control including the drop down list while the height given to us
// is, of course, just the height of the permanently visible part of it so
// add the drop down height to it
// don't make the drop down list too tall, arbitrarily limit it to 30
// items max and also don't make it too small if it's currently empty
size_t nItems = GetCount();
if (!HasFlag(wxCB_SIMPLE))
{
if ( !nItems )
nItems = 9;
else if ( nItems > 30 )
nItems = 30;
}
const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
int heightWithItems = 0;
if (!HasFlag(wxCB_SIMPLE))
heightWithItems = height + hItem*nItems;
else
heightWithItems = SetHeightSimpleComboBox(nItems);
// do resize the native control
wxControl::DoSetSize(x, y, width, heightWithItems, sizeFlags);
// make the control itself of the requested height: notice that this
// must be done after changing its size or it has no effect (apparently
// the height is reset to default during the control layout) and that it's
// useless to to do it when using the deferred sizing -- in this case it
// will be done from MSWEndDeferWindowPos()
#if wxUSE_DEFERRED_SIZING
if ( m_pendingSize == wxDefaultSize )
{
// not using deferred sizing, update it immediately
MSWUpdateVisibleHeight();
}
else // in the middle of deferred sizing
{
// we need to report the size of the visible part of the control back
// in GetSize() and not height stored by DoSetSize() in m_pendingSize
m_pendingSize = wxSize(width, height);
}
#else // !wxUSE_DEFERRED_SIZING
// always update the visible height immediately
MSWUpdateVisibleHeight();
#endif // wxUSE_DEFERRED_SIZING
}
