#include "wx/settings.h"
#endif
+#include "wx/dynlib.h"
+
#include "wx/msw/private.h"
// ============================================================================
Clear();
}
+bool wxChoice::MSWGetComboBoxInfo(tagCOMBOBOXINFO* info) const
+{
+ // TODO-Win9x: Get rid of this once we officially drop support for Win9x
+ // and just call the function directly.
+#if wxUSE_DYNLIB_CLASS
+ typedef BOOL (WINAPI *GetComboBoxInfo_t)(HWND, tagCOMBOBOXINFO*);
+ static GetComboBoxInfo_t s_pfnGetComboBoxInfo = NULL;
+ static bool s_triedToLoad = false;
+ if ( !s_triedToLoad )
+ {
+ s_triedToLoad = true;
+ wxLoadedDLL dllUser32("user32.dll");
+ wxDL_INIT_FUNC(s_pfn, GetComboBoxInfo, dllUser32);
+ }
+
+ if ( s_pfnGetComboBoxInfo )
+ return (*s_pfnGetComboBoxInfo)(GetHwnd(), info) != 0;
+#endif // wxUSE_DYNLIB_CLASS
+
+ return false;
+}
+
// ----------------------------------------------------------------------------
// adding/deleting items to/from the list
// ----------------------------------------------------------------------------
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;
+ // The base version returns the size of the largest string
+ return GetSizeFromTextSize(wxChoiceBase::DoGetBestSize().x);
}
int wxChoice::SetHeightSimpleComboBox(int nItems) const
return EDIT_HEIGHT_FROM_CHAR_HEIGHT( cy ) * wxMin( wxMax( nItems, 3 ), 6 ) + hItem - 1;
}
+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;
+}
+
// ----------------------------------------------------------------------------
// Popup operations
// ----------------------------------------------------------------------------
/*
The native control provides a great variety in the events it sends in
the different selection scenarios (undoubtedly for greater amusement of
- the programmers using it). For the reference, here are the cases when
- the final selection is accepted (things are quite interesting when it
- is cancelled too):
+ the programmers using it). Here are the different cases:
A. Selecting with just the arrows without opening the dropdown:
1. CBN_SELENDOK
Admire the different order of messages in all of those cases, it must
surely have taken a lot of effort to Microsoft developers to achieve
such originality.
+
+ Additionally, notice that CBN_SELENDCANCEL doesn't seem to actually
+ cancel anything, if we get CBN_SELCHANGE before it, as it happens in
+ the case (B), the selection is still accepted. This doesn't make much
+ sense and directly contradicts MSDN documentation but is how the native
+ comboboxes behave and so we do the same thing.
*/
switch ( param )
{
break;
case CBN_CLOSEUP:
- // if the selection was accepted by the user, it should have been
- // reset to wxID_NONE by CBN_SELENDOK, otherwise the selection was
- // cancelled and we must restore the old one
- if ( m_lastAcceptedSelection != wxID_NONE )
+ if ( m_pendingSelection != wxID_NONE )
{
- SetSelection(m_lastAcceptedSelection);
- m_lastAcceptedSelection = wxID_NONE;
+ // This can only happen in the case (B), so set the item
+ // selected in the drop down as our real selection.
+ SendSelectionChangedEvent(wxEVT_COMMAND_CHOICE_SELECTED);
+ m_pendingSelection = wxID_NONE;
}
break;
case CBN_SELENDOK:
- // reset it to prevent CBN_CLOSEUP from undoing the selection (it's
- // ok to reset it now as GetCurrentSelection() will now return the
- // same thing anyhow)
- m_lastAcceptedSelection = wxID_NONE;
-
- {
- const int n = GetSelection();
-
- wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
- event.SetInt(n);
- event.SetEventObject(this);
-
- if ( n > -1 )
- {
- event.SetString(GetStringSelection());
- InitCommandEventWithItems(event, n);
- }
+ // Reset the variables to prevent CBN_CLOSEUP from doing anything,
+ // it's not needed if we do get CBN_SELENDOK.
+ m_lastAcceptedSelection =
+ m_pendingSelection = wxID_NONE;
- ProcessCommand(event);
- }
+ SendSelectionChangedEvent(wxEVT_COMMAND_CHOICE_SELECTED);
break;
- // don't handle CBN_SELENDCANCEL: just leave m_lastAcceptedSelection
- // valid and the selection will be undone in CBN_CLOSEUP above
+ case CBN_SELCHANGE:
+ // If we get this event after CBN_SELENDOK, i.e. cases (A) or (C)
+ // above, we don't have anything to do. But in the case (B) we need
+ // to remember that the selection should really change once the
+ // drop down is closed.
+ if ( m_lastAcceptedSelection != wxID_NONE )
+ m_pendingSelection = GetCurrentSelection();
+ break;
- // don't handle CBN_SELCHANGE neither, we don't want to generate events
- // while the dropdown is opened -- but do add it if we ever need this
+ case CBN_SELENDCANCEL:
+ // Do not reset m_pendingSelection here -- it would make sense but,
+ // as described above, native controls keep the selection even when
+ // closing the drop down by pressing Escape or TAB, so conform to
+ // their behaviour.
+ m_lastAcceptedSelection = wxID_NONE;
+ break;
default:
return false;
projects / wxWidgets.git / blobdiff