void wxHeaderCtrl::DoMoveCol(unsigned int idx, unsigned int pos)
{
MoveColumnInOrderArray(m_colIndices, idx, pos);
Refresh();
}
bool wxHeaderCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
{
NMHEADER * const nmhdr = (NMHEADER *)lParam;
wxEventType evtType = wxEVT_NULL;
int width = 0;
int order = -1;
bool veto = false;
const UINT code = nmhdr->hdr.code;
// we don't have the index for all events, e.g. not for NM_RELEASEDCAPTURE
// so only access for header control events (and yes, the direction of
// comparisons with FIRST/LAST is correct even if it seems inverted)
int idx = code <= HDN_FIRST && code > HDN_LAST ? nmhdr->iItem : -1;
if ( idx != -1 )
{
// we also get bogus HDN_BEGINDRAG with -1 index so don't call
// MSWFromNativeIdx() unconditionally for nmhdr->iItem
idx = MSWFromNativeIdx(idx);
}
switch ( code )
{
// click events
// ------------
case HDN_ITEMCLICK:
case HDN_ITEMDBLCLICK:
evtType = GetClickEventType(code == HDN_ITEMDBLCLICK, nmhdr->iButton);
// We're not dragging any more.
m_colBeingDragged = -1;
break;
// although we should get the notifications about the right clicks
// via HDN_ITEM[DBL]CLICK too according to MSDN this simply doesn't
// happen in practice on any Windows system up to 2003
case NM_RCLICK:
case NM_RDBLCLK:
{
POINT pt;
idx = wxMSWGetColumnClicked(&nmhdr->hdr, &pt);
if ( idx != wxNOT_FOUND )
{
idx = MSWFromNativeIdx(idx);
// due to a bug in mingw32 headers NM_RDBLCLK is signed
// there so we need a cast to avoid warnings about signed/
// unsigned comparison
evtType = GetClickEventType(
code == static_cast<UINT>(NM_RDBLCLK), 1);
}
//else: ignore clicks outside any column
}
break;
case HDN_DIVIDERDBLCLICK:
evtType = wxEVT_COMMAND_HEADER_SEPARATOR_DCLICK;
break;
// column resizing events
// ----------------------
// see comments in wxListCtrl::MSWOnNotify() for why we catch both
// ASCII and Unicode versions of this message
case HDN_BEGINTRACKA:
case HDN_BEGINTRACKW:
// non-resizable columns can't be resized no matter what, don't
// even generate any events for them
if ( !GetColumn(idx).IsResizeable() )
{
veto = true;
break;
}
evtType = wxEVT_COMMAND_HEADER_BEGIN_RESIZE;
// fall through
case HDN_ENDTRACKA:
case HDN_ENDTRACKW:
width = nmhdr->pitem->cxy;
if ( evtType == wxEVT_NULL )
{
evtType = wxEVT_COMMAND_HEADER_END_RESIZE;
// don't generate events with invalid width
const int minWidth = GetColumn(idx).GetMinWidth();
if ( width < minWidth )
width = minWidth;
}
break;
// The control is not supposed to send HDN_TRACK when using
// HDS_FULLDRAG (which we do use) but apparently some versions of
// comctl32.dll still do it, see #13506, so catch both messages
// just in case we are dealing with one of these buggy versions.
case HDN_TRACK:
case HDN_ITEMCHANGING:
if ( nmhdr->pitem && (nmhdr->pitem->mask & HDI_WIDTH) )
{
// prevent the column from being shrunk beneath its min width
width = nmhdr->pitem->cxy;
if ( width < GetColumn(idx).GetMinWidth() )
{
// don't generate any events and prevent the change from
// happening
veto = true;
}
else // width is acceptable
{
// generate the resizing event from here as we don't seem
// to be getting HDN_TRACK events at all, at least with
// comctl32.dll v6
evtType = wxEVT_COMMAND_HEADER_RESIZING;
}
}
break;
// column reordering events
// ------------------------
case HDN_BEGINDRAG:
// Windows sometimes sends us events with invalid column indices
if ( nmhdr->iItem == -1 )
break;
// If we are dragging a column that is not draggable and the mouse
// is moved over a different column then we get the column number from
// the column under the mouse. This results in an unexpected behaviour
// if this column is draggable. To prevent this remember the column we
// are dragging for the complete drag and drop cycle.
if ( m_colBeingDragged == -1 )
{
m_colBeingDragged = idx;
}
// column must have the appropriate flag to be draggable
if ( !GetColumn(m_colBeingDragged).IsReorderable() )
{
veto = true;
break;
}
evtType = wxEVT_COMMAND_HEADER_BEGIN_REORDER;
break;
case HDN_ENDDRAG:
wxASSERT_MSG( nmhdr->pitem->mask & HDI_ORDER, "should have order" );
order = nmhdr->pitem->iOrder;
// we also get messages with invalid order when column reordering
// is cancelled (e.g. by pressing Esc)
if ( order == -1 )
break;
order = MSWFromNativeOrder(order);
evtType = wxEVT_COMMAND_HEADER_END_REORDER;
// We (successfully) ended dragging the column.
m_colBeingDragged = -1;
break;
case NM_RELEASEDCAPTURE:
evtType = wxEVT_COMMAND_HEADER_DRAGGING_CANCELLED;
// Dragging the column was cancelled.
m_colBeingDragged = -1;
break;
}
// do generate the corresponding wx event
if ( evtType != wxEVT_NULL )
{
wxHeaderCtrlEvent event(evtType, GetId());
event.SetEventObject(this);
event.SetColumn(idx);
event.SetWidth(width);
if ( order != -1 )
event.SetNewOrder(order);
const bool processed = GetEventHandler()->ProcessEvent(event);
if ( processed && !event.IsAllowed() )
veto = true;
if ( !veto )
{
// special post-processing for HDN_ENDDRAG: we need to update the
// internal column indices array if this is allowed to go ahead as
// the native control is going to reorder its columns now
if ( evtType == wxEVT_COMMAND_HEADER_END_REORDER )
MoveColumnInOrderArray(m_colIndices, idx, order);
if ( processed )
{
// skip default processing below
return true;
}
}
}
if ( veto )
{
// all of HDN_BEGIN{DRAG,TRACK}, HDN_TRACK and HDN_ITEMCHANGING
// interpret TRUE return value as meaning to stop the control
// default handling of the message
*result = TRUE;
return true;
}
return wxHeaderCtrlBase::MSWOnNotify(idCtrl, lParam, result);
}