X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/cd747e1598205eddde96768b61cc7f0b324ba870..cdbd62d6ff290fd58acd1bc5574dfc79db3a6f70:/src/msw/choice.cpp diff --git a/src/msw/choice.cpp b/src/msw/choice.cpp index ee5f46167e..26e4a8e135 100644 --- a/src/msw/choice.cpp +++ b/src/msw/choice.cpp @@ -4,7 +4,6 @@ // Author: Julian Smart // Modified by: Vadim Zeitlin to derive from wxChoiceBase // Created: 04/01/98 -// RCS-ID: $Id$ // Copyright: (c) Julian Smart // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// @@ -36,6 +35,8 @@ #include "wx/settings.h" #endif +#include "wx/dynlib.h" + #include "wx/msw/private.h" // ============================================================================ @@ -198,6 +199,28 @@ wxChoice::~wxChoice() 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 // ---------------------------------------------------------------------------- @@ -333,7 +356,7 @@ int wxChoice::FindString(const wxString& s, bool bCase) const else { int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT, - (WPARAM)-1, (LPARAM)s.wx_str()); + (WPARAM)-1, wxMSW_CONV_LPARAM(s)); return pos == LB_ERR ? wxNOT_FOUND : pos; } @@ -360,7 +383,7 @@ void wxChoice::SetString(unsigned int n, const wxString& s) const bool wasSelected = static_cast(n) == GetSelection(); ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0); - ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.wx_str() ); + ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, wxMSW_CONV_LPARAM(s) ); // restore the client data if ( oldData ) @@ -587,43 +610,85 @@ void wxChoice::DoSetSize(int x, int y, 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; - } + // The base version returns the size of the largest string + return GetSizeFromTextSize(wxChoiceBase::DoGetBestSize().x); +} - // give it some reasonable default value if there are no strings in the - // list - if ( wChoice == 0 ) - wChoice = 100; +int wxChoice::SetHeightSimpleComboBox(int nItems) const +{ + int cx, cy; + wxGetCharSize( GetHWND(), &cx, &cy, GetFont() ); + int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, (WPARAM)-1, 0); + return EDIT_HEIGHT_FROM_CHAR_HEIGHT( cy ) * wxMin( wxMax( nItems, 3 ), 6 ) + hItem - 1; +} - // the combobox should be slightly larger than the widest string - wChoice += 5*GetCharWidth(); - if( HasFlag( wxCB_SIMPLE ) ) +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 info; + if ( MSWGetComboBoxInfo(&info) ) { - hChoice = SetHeightSimpleComboBox( nItems ); + 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 - hChoice = EDIT_HEIGHT_FROM_CHAR_HEIGHT(GetCharHeight()); + tsize.y = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cHeight); - wxSize best(wChoice, hChoice); - CacheBestSize(best); - return best; + // Perhaps the user wants something different from CharHeight + if ( ylen > 0 ) + tsize.IncBy(0, ylen - cHeight); + + return tsize; } -int wxChoice::SetHeightSimpleComboBox(int nItems) const +// ---------------------------------------------------------------------------- +// Popup operations +// ---------------------------------------------------------------------------- + +void wxChoice::MSWDoPopupOrDismiss(bool show) { - int cx, cy; - wxGetCharSize( GetHWND(), &cx, &cy, GetFont() ); - int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, (WPARAM)-1, 0); - return EDIT_HEIGHT_FROM_CHAR_HEIGHT( cy ) * wxMin( wxMax( nItems, 3 ), 6 ) + hItem - 1; + wxASSERT_MSG( !HasFlag(wxCB_SIMPLE), + wxT("can't popup/dismiss the list for simple combo box") ); + + // we *must* set focus to the combobox before showing or hiding the drop + // down as without this we get WM_LBUTTONDOWN messages with invalid HWND + // when hiding it (whether programmatically or manually) resulting in a + // crash when we pass them to IsDialogMessage() + // + // this can be seen in the combo page of the widgets sample under Windows 7 + SetFocus(); + + ::SendMessage(GetHwnd(), CB_SHOWDROPDOWN, show, 0); +} + +bool wxChoice::Show(bool show) +{ + if ( !wxChoiceBase::Show(show) ) + return false; + + // When hiding the combobox, we also need to hide its popup part as it + // doesn't happen automatically. + if ( !show && ::SendMessage(GetHwnd(), CB_GETDROPPEDSTATE, 0, 0) ) + MSWDoPopupOrDismiss(false); + + return true; } // ---------------------------------------------------------------------------- @@ -674,9 +739,7 @@ bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)) /* 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 @@ -698,6 +761,12 @@ bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)) 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 ) { @@ -710,44 +779,40 @@ bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)) 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_CHOICE); + 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(); + // 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; - wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId); - event.SetInt(n); - event.SetEventObject(this); - - if ( n > -1 ) - { - event.SetString(GetStringSelection()); - InitCommandEventWithItems(event, n); - } - - ProcessCommand(event); - } + SendSelectionChangedEvent(wxEVT_CHOICE); 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; @@ -758,7 +823,7 @@ bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)) WXHBRUSH wxChoice::MSWControlColor(WXHDC hDC, WXHWND hWnd) { - if ( !IsEnabled() ) + if ( !IsThisEnabled() ) return MSWControlColorDisabled(hDC); return wxChoiceBase::MSWControlColor(hDC, hWnd);