X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/2432b92dd7a837db13d3938a56c1959decd03203..eea4d01c65f9b29baa1193db762b4c6b8144af24:/src/msw/choice.cpp diff --git a/src/msw/choice.cpp b/src/msw/choice.cpp index d36ce7fe08..03d3b3fb50 100644 --- a/src/msw/choice.cpp +++ b/src/msw/choice.cpp @@ -1,351 +1,758 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: choice.cpp +// Name: src/msw/choice.cpp // Purpose: wxChoice // Author: Julian Smart -// Modified by: +// Modified by: Vadim Zeitlin to derive from wxChoiceBase // Created: 04/01/98 // RCS-ID: $Id$ -// Copyright: (c) Julian Smart and Markus Holzem -// Licence: wxWindows license +// Copyright: (c) Julian Smart +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -#ifdef __GNUG__ -#pragma implementation "choice.h" -#endif +// ============================================================================ +// declarations +// ============================================================================ + +// ---------------------------------------------------------------------------- +// headers +// ---------------------------------------------------------------------------- // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" #ifdef __BORLANDC__ -#pragma hdrstop + #pragma hdrstop #endif -#ifndef WX_PRECOMP +#if wxUSE_CHOICE && !(defined(__SMARTPHONE__) && defined(__WXWINCE__)) + #include "wx/choice.h" -#include "wx/utils.h" + +#ifndef WX_PRECOMP + #include "wx/utils.h" + #include "wx/app.h" + #include "wx/log.h" + #include "wx/brush.h" + #include "wx/settings.h" #endif #include "wx/msw/private.h" -#if !USE_SHARED_LIBRARY -IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl) -#endif +// ============================================================================ +// implementation +// ============================================================================ + +// ---------------------------------------------------------------------------- +// creation +// ---------------------------------------------------------------------------- + +bool wxChoice::Create(wxWindow *parent, + wxWindowID id, + const wxPoint& pos, + const wxSize& size, + int n, const wxString choices[], + long style, + const wxValidator& validator, + const wxString& name) +{ + // Experience shows that wxChoice vs. wxComboBox distinction confuses + // quite a few people - try to help them + wxASSERT_MSG( !(style & wxCB_DROPDOWN) && + !(style & wxCB_READONLY) && + !(style & wxCB_SIMPLE), + wxT("this style flag is ignored by wxChoice, you ") + wxT("probably want to use a wxComboBox") ); + + return CreateAndInit(parent, id, pos, size, n, choices, style, + validator, name); +} -bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)) +bool wxChoice::CreateAndInit(wxWindow *parent, + wxWindowID id, + const wxPoint& pos, + const wxSize& size, + int n, const wxString choices[], + long style, + const wxValidator& validator, + const wxString& name) +{ + // initialize wxControl + if ( !CreateControl(parent, id, pos, size, style, validator, name) ) + return false; + + // now create the real HWND + if ( !MSWCreateControl(wxT("COMBOBOX"), wxEmptyString, pos, size) ) + return false; + + + // initialize the controls contents + for ( int i = 0; i < n; i++ ) + { + Append(choices[i]); + } + + // and now we may finally size the control properly (if needed) + SetInitialSize(size); + + return true; +} + +void wxChoice::SetLabel(const wxString& label) +{ + if ( FindString(label) == wxNOT_FOUND ) + { + // unless we explicitly do this here, CB_GETCURSEL will continue to + // return the index of the previously selected item which will result + // in wrongly replacing the value being set now with the previously + // value if the user simply opens and closes (without selecting + // anything) the combobox popup + SetSelection(-1); + } + + wxChoiceBase::SetLabel(label); +} + +bool wxChoice::Create(wxWindow *parent, + wxWindowID id, + const wxPoint& pos, + const wxSize& size, + const wxArrayString& choices, + long style, + const wxValidator& validator, + const wxString& name) +{ + wxCArrayString chs(choices); + return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(), + style, validator, name); +} + +bool wxChoice::MSWShouldPreProcessMessage(WXMSG *pMsg) { - if (param == CBN_SELCHANGE) - { - wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId); - event.SetInt(GetSelection()); - event.SetEventObject(this); - event.SetString(copystring(GetStringSelection())); - ProcessCommand(event); - delete[] event.GetString(); - return TRUE; - } - else return FALSE; + MSG *msg = (MSG *) pMsg; + + // if the dropdown list is visible, don't preprocess certain keys + if ( msg->message == WM_KEYDOWN + && (msg->wParam == VK_ESCAPE || msg->wParam == VK_RETURN) ) + { + if (::SendMessage(GetHwndOf(this), CB_GETDROPPEDSTATE, 0, 0)) + { + return false; + } + } + + return wxControl::MSWShouldPreProcessMessage(pMsg); } -bool wxChoice::Create(wxWindow *parent, wxWindowID id, - const wxPoint& pos, - const wxSize& size, - int n, const wxString choices[], - long style, - const wxValidator& validator, - const wxString& name) -{ - SetName(name); - SetValidator(validator); - if (parent) parent->AddChild(this); - SetBackgroundColour(parent->GetBackgroundColour()) ; - SetForegroundColour(parent->GetForegroundColour()) ; - m_noStrings = n; - - m_windowStyle = style; - - if ( id == -1 ) - m_windowId = (int)NewControlId(); - else - m_windowId = id; - - int x = pos.x; - int y = pos.y; - int width = size.x; - int height = size.y; - - long msStyle = WS_CHILD | CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL - | WS_TABSTOP | WS_VISIBLE; - if (m_windowStyle & wxCB_SORT) - msStyle |= CBS_SORT; - - bool want3D; - WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ; - - // Even with extended styles, need to combine with WS_BORDER - // for them to look right. - if ( want3D || wxStyleHasBorder(m_windowStyle) ) - msStyle |= WS_BORDER; - - m_hWnd = (WXHWND)::CreateWindowEx(exStyle, "COMBOBOX", NULL, - msStyle, - 0, 0, 0, 0, (HWND) parent->GetHWND(), (HMENU)m_windowId, - wxGetInstance(), NULL); - - wxCHECK_MSG( m_hWnd, FALSE, "Failed to create combobox" ); - -/* -#if CTL3D - if (want3D) - { - m_useCtl3D = TRUE; - Ctl3dSubclassCtl(wx_combo); // Does CTL3D affect the combobox? I think not. - } +WXDWORD wxChoice::MSWGetStyle(long style, WXDWORD *exstyle) const +{ + // we never have an external border + WXDWORD msStyle = wxControl::MSWGetStyle + ( + (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle + ); + + // WS_CLIPSIBLINGS is useful with wxChoice and doesn't seem to result in + // any problems + msStyle |= WS_CLIPSIBLINGS; + + // wxChoice-specific styles + msStyle |= CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL; + if ( style & wxCB_SORT ) + msStyle |= CBS_SORT; + + return msStyle; +} + +#ifndef EP_EDITTEXT + #define EP_EDITTEXT 1 + #define ETS_NORMAL 1 #endif -*/ - // Subclass again for purposes of dialog editing mode - SubclassWin(m_hWnd); +wxVisualAttributes +wxChoice::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant)) +{ + // it is important to return valid values for all attributes from here, + // GetXXX() below rely on this + wxVisualAttributes attrs; - SetFont(parent->GetFont()); + // FIXME: Use better dummy window? + wxWindow* wnd = wxTheApp->GetTopWindow(); + if (!wnd) + return attrs; - int i; - for (i = 0; i < n; i++) - { - Append(choices[i]); - } - SetSelection(n); + attrs.font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT); - SetSize(x, y, width, height); + // there doesn't seem to be any way to get the text colour using themes + // API: TMT_TEXTCOLOR doesn't work neither for EDIT nor COMBOBOX + attrs.colFg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT); - return TRUE; + // NB: use EDIT, not COMBOBOX (the latter works in XP but not Vista) + attrs.colBg = wnd->MSWGetThemeColour(L"EDIT", + EP_EDITTEXT, + ETS_NORMAL, + ThemeColourBackground, + wxSYS_COLOUR_WINDOW); + + return attrs; } -void wxChoice::Append(const wxString& item) +wxChoice::~wxChoice() { - SendMessage((HWND) GetHWND(), CB_ADDSTRING, 0, (LONG)(const char *)item); + Clear(); +} + +// ---------------------------------------------------------------------------- +// adding/deleting items to/from the list +// ---------------------------------------------------------------------------- + +int wxChoice::DoInsertItems(const wxArrayStringsAdapter& items, + unsigned int pos, + void **clientData, wxClientDataType type) +{ + MSWAllocStorage(items, CB_INITSTORAGE); + + const bool append = pos == GetCount(); + + // use CB_ADDSTRING when appending at the end to make sure the control is + // resorted if it has wxCB_SORT style + const unsigned msg = append ? CB_ADDSTRING : CB_INSERTSTRING; + + if ( append ) + pos = 0; + + int n = wxNOT_FOUND; + const unsigned numItems = items.GetCount(); + for ( unsigned i = 0; i < numItems; ++i ) + { + n = MSWInsertOrAppendItem(pos, items[i], msg); + if ( n == wxNOT_FOUND ) + return n; + + if ( !append ) + pos++; + + AssignNewItemClientData(n, clientData, i, type); + } + + // we need to refresh our size in order to have enough space for the + // newly added items + if ( !IsFrozen() ) + MSWUpdateDropDownHeight(); + + InvalidateBestSize(); - m_noStrings ++; + return n; } -void wxChoice::Delete(int n) +void wxChoice::DoDeleteOneItem(unsigned int n) { - m_noStrings = (int)SendMessage((HWND) GetHWND(), CB_DELETESTRING, n, 0); + wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") ); + + SendMessage(GetHwnd(), CB_DELETESTRING, n, 0); + + if ( !IsFrozen() ) + MSWUpdateDropDownHeight(); + + InvalidateBestSize(); } -void wxChoice::Clear(void) +void wxChoice::DoClear() { - SendMessage((HWND) GetHWND(), CB_RESETCONTENT, 0, 0); + SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0); - m_noStrings = 0; + if ( !IsFrozen() ) + MSWUpdateDropDownHeight(); + + InvalidateBestSize(); } +// ---------------------------------------------------------------------------- +// selection +// ---------------------------------------------------------------------------- -int wxChoice::GetSelection(void) const +int wxChoice::GetSelection() const { - return (int)SendMessage((HWND) GetHWND(), CB_GETCURSEL, 0, 0); + // if m_lastAcceptedSelection is set, it means that the dropdown is + // currently shown and that we want to use the last "permanent" selection + // instead of whatever is under the mouse pointer currently + // + // otherwise, get the selection from the control + return m_lastAcceptedSelection == wxID_NONE ? GetCurrentSelection() + : m_lastAcceptedSelection; +} + +int wxChoice::GetCurrentSelection() const +{ + return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0); } void wxChoice::SetSelection(int n) { - SendMessage((HWND) GetHWND(), CB_SETCURSEL, n, 0); + SendMessage(GetHwnd(), CB_SETCURSEL, n, 0); } -int wxChoice::FindString(const wxString& s) const +// ---------------------------------------------------------------------------- +// string list functions +// ---------------------------------------------------------------------------- + +unsigned int wxChoice::GetCount() const { -#if defined(__WATCOMC__) && defined(__WIN386__) - // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message. - // Do it the long way instead. - char buf[512]; - for (int i = 0; i < Number(); i++) - { - int len = (int)SendMessage((HWND) GetHWND(), CB_GETLBTEXT, i, (LPARAM)(LPSTR)buf); - buf[len] = 0; - if (strcmp(buf, (const char *)s) == 0) - return i; - } - return -1; -#else - int pos = (int)SendMessage((HWND) GetHWND(), CB_FINDSTRINGEXACT, (WPARAM)-1, (LPARAM)(LPSTR)(const char *)s); - if (pos == LB_ERR) - return -1; - else - return pos; -#endif + return (unsigned int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0); } -wxString wxChoice::GetString(int n) const +int wxChoice::FindString(const wxString& s, bool bCase) const { - int len = (int)SendMessage((HWND) GetHWND(), CB_GETLBTEXT, n, (long)wxBuffer); - wxBuffer[len] = 0; - return wxString(wxBuffer); +#if defined(__WATCOMC__) && defined(__WIN386__) + // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message. + // wxChoice::Do it the long way instead. + unsigned int count = GetCount(); + for ( unsigned int i = 0; i < count; i++ ) + { + // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too + if (GetString(i).IsSameAs(s, bCase)) + return i; + } + + return wxNOT_FOUND; +#else // !Watcom + //TODO: Evidently some MSW versions (all?) don't like empty strings + //passed to SendMessage, so we have to do it ourselves in that case + if ( s.empty() ) + { + unsigned int count = GetCount(); + for ( unsigned int i = 0; i < count; i++ ) + { + if (GetString(i).empty()) + return i; + } + + return wxNOT_FOUND; + } + else if (bCase) + { + // back to base class search for not native search type + return wxItemContainerImmutable::FindString( s, bCase ); + } + else + { + int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT, + (WPARAM)-1, (LPARAM)s.wx_str()); + + return pos == LB_ERR ? wxNOT_FOUND : pos; + } +#endif // Watcom/!Watcom } -void wxChoice::SetSize(int x, int y, int width, int height, int sizeFlags) +void wxChoice::SetString(unsigned int n, const wxString& s) { - int currentX, currentY; - GetPosition(¤tX, ¤tY); + wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::SetString") ); - int x1 = x; - int y1 = y; - int w1 = width; - int h1 = height; + // we have to delete and add back the string as there is no way to change a + // string in place - if (x == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE)) - x1 = currentX; - if (y == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE)) - y1 = currentY; + // we need to preserve the client data manually + void *oldData = NULL; + wxClientData *oldObjData = NULL; + if ( HasClientUntypedData() ) + oldData = GetClientData(n); + else if ( HasClientObjectData() ) + oldObjData = GetClientObject(n); - AdjustForParentClientOrigin(x1, y1, sizeFlags); + ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0); + ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.wx_str() ); - // If we're prepared to use the existing size, then... - if (width == -1 && height == -1 && ((sizeFlags & wxSIZE_AUTO) != wxSIZE_AUTO)) - { - GetSize(&w1, &h1); - } + // restore the client data + if ( oldData ) + SetClientData(n, oldData); + else if ( oldObjData ) + SetClientObject(n, oldObjData); - int cx; // button font dimensions - int cy; - wxGetCharSize(GetHWND(), &cx, &cy, & GetFont()); + InvalidateBestSize(); +} - int control_width, control_height; +wxString wxChoice::GetString(unsigned int n) const +{ + int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0); - // Ignore height parameter because height doesn't - // mean 'initially displayed' height, it refers to the - // drop-down menu as well. The wxWindows interpretation - // is different; also, getting the size returns the - // _displayed_ size (NOT the drop down menu size) - // so setting-getting-setting size would not work. - h1 = -1; + wxString str; + if ( len != CB_ERR && len > 0 ) + { + if ( ::SendMessage + ( + GetHwnd(), + CB_GETLBTEXT, + n, + (LPARAM)(wxChar *)wxStringBuffer(str, len) + ) == CB_ERR ) + { + wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)")); + } + } + + return str; +} - // Deal with default size (using -1 values) - if (width <= 0) - { - // Find the longest string - if (m_noStrings == 0) +// ---------------------------------------------------------------------------- +// client data +// ---------------------------------------------------------------------------- + +void wxChoice::DoSetItemClientData(unsigned int n, void* clientData) +{ + if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA, + n, (LPARAM)clientData) == CB_ERR ) { - control_width = 100; + wxLogLastError(wxT("CB_SETITEMDATA")); } - else +} + +void* wxChoice::DoGetItemClientData(unsigned int n) const +{ + LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0); + if ( rc == CB_ERR ) { - int len, ht; - int longest = 0; - int i; - for (i = 0; i < m_noStrings; i++) - { - wxString str(GetString(i)); - GetTextExtent(str, &len, &ht, NULL, NULL, & GetFont()); - if ( len > longest) - longest = len; - } - - control_width = longest + cx*5; + wxLogLastError(wxT("CB_GETITEMDATA")); + + // unfortunately, there is no way to return an error code to the user + rc = (LPARAM) NULL; } - } - else - { - // If non-default width... - control_width = w1; - } - - - // Choice drop-down list depends on number of items (limited to 10) - if (h1 <= 0) - { - if (m_noStrings == 0) - h1 = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*10; - else - h1 = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMin(10, m_noStrings) + 1); - } - control_height = h1; + return (void *)rc; +} - // Calculations may have made text size too small - if (control_height <= 0) - control_height = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy); +// ---------------------------------------------------------------------------- +// wxMSW-specific geometry management +// ---------------------------------------------------------------------------- - if (control_width <= 0) - control_width = 100; +namespace +{ + +// there is a difference between the height passed to CB_SETITEMHEIGHT and the +// real height of the combobox; it is probably not constant for all Windows +// versions/settings but right now I don't know how to find what it is so it is +// temporarily hardcoded to its value under XP systems with normal fonts sizes +const int COMBO_HEIGHT_ADJ = 6; - MoveWindow((HWND)GetHWND(), x1, y1, - control_width, control_height, TRUE); +} // anonymous namespace + +void wxChoice::MSWUpdateVisibleHeight() +{ + if ( m_heightOwn != wxDefaultCoord ) + { + ::SendMessage(GetHwnd(), CB_SETITEMHEIGHT, + (WPARAM)-1, m_heightOwn - COMBO_HEIGHT_ADJ); + } +} + +#if wxUSE_DEFERRED_SIZING +void wxChoice::MSWEndDeferWindowPos() +{ + // we can only set the height of the choice itself now as it is reset to + // default every time the control is resized + MSWUpdateVisibleHeight(); + + wxChoiceBase::MSWEndDeferWindowPos(); +} +#endif // wxUSE_DEFERRED_SIZING + +void wxChoice::MSWUpdateDropDownHeight() +{ + // be careful to not change the width here + DoSetSize(wxDefaultCoord, wxDefaultCoord, wxDefaultCoord, GetSize().y, + wxSIZE_USE_EXISTING); } -WXHBRUSH wxChoice::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor, - WXUINT message, WXWPARAM wParam, WXLPARAM lParam) +void wxChoice::DoMoveWindow(int x, int y, int width, int height) { - return 0; + // here is why this is necessary: if the width is negative, the combobox + // window proc makes the window of the size width*height instead of + // interpreting height in the usual manner (meaning the height of the drop + // down list - usually the height specified in the call to MoveWindow() + // will not change the height of combo box per se) + // + // this behaviour is not documented anywhere, but this is just how it is + // here (NT 4.4) and, anyhow, the check shouldn't hurt - however without + // the check, constraints/sizers using combos may break the height + // constraint will have not at all the same value as expected + if ( width < 0 ) + return; + + wxControl::DoMoveWindow(x, y, width, height); } -long wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam) +void wxChoice::DoGetSize(int *w, int *h) const { - switch (nMsg) + wxControl::DoGetSize(w, h); + + // this is weird: sometimes, the height returned by Windows is clearly the + // total height of the control including the drop down list -- but only + // sometimes, and sometimes it isn't so work around this here by using our + // own stored value if we have it + if ( h && m_heightOwn != wxDefaultCoord ) + *h = m_heightOwn; +} + +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 ) { -/* - case WM_GETDLGCODE: - { - if (GetWindowStyleFlag() & wxPROCESS_ENTER) - return DLGC_WANTALLKEYS; - break; - } -*/ -/* - case WM_CHAR: // Always an ASCII character - { - if (wParam == VK_RETURN) - { - wxCommandEvent event(wxEVENT_TYPE_TEXT_ENTER_COMMAND); - event.commandString = ((wxTextCtrl *)item)->GetValue(); - event.eventObject = item; - item->ProcessCommand(event); - return FALSE; - } - break; - } -*/ - case WM_LBUTTONUP: - { - int x = (int)LOWORD(lParam); - int y = (int)HIWORD(lParam); - - // Ok, this is truly weird, but if a panel with a wxChoice loses the - // focus, then you get a *fake* WM_LBUTTONUP message - // with x = 65535 and y = 65535. - // Filter out this nonsense. - if (x == 65535 && y == 65535) - return Default(); - break; - } + // 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); - return wxWindow::MSWWindowProc(nMsg, wParam, lParam); + + // 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 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 } -wxString wxChoice::GetStringSelection (void) const +wxSize wxChoice::DoGetBestSize() const { - int sel = GetSelection (); - if (sel > -1) - return wxString(this->GetString (sel)); - else - return wxString(""); + // 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; } -bool wxChoice::SetStringSelection (const wxString& s) +int wxChoice::SetHeightSimpleComboBox(int nItems) const { - int sel = FindString (s); - if (sel > -1) + 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; +} + +// ---------------------------------------------------------------------------- +// MSW message handlers +// ---------------------------------------------------------------------------- + +WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam) +{ + switch ( nMsg ) { - SetSelection (sel); - return TRUE; + case WM_LBUTTONUP: + { + int x = (int)LOWORD(lParam); + int y = (int)HIWORD(lParam); + + // Ok, this is truly weird, but if a panel with a wxChoice + // loses the focus, then you get a *fake* WM_LBUTTONUP message + // with x = 65535 and y = 65535. Filter out this nonsense. + // + // VZ: I'd like to know how to reproduce this please... + if ( x == 65535 && y == 65535 ) + return 0; + } + break; + + // we have to handle both: one for the normal case and the other + // for readonly + case WM_CTLCOLOREDIT: + case WM_CTLCOLORLISTBOX: + case WM_CTLCOLORSTATIC: + { + WXHDC hdc; + WXHWND hwnd; + UnpackCtlColor(wParam, lParam, &hdc, &hwnd); + + WXHBRUSH hbr = MSWControlColor((WXHDC)hdc, hwnd); + if ( hbr ) + return (WXLRESULT)hbr; + //else: fall through to default window proc + } } - else - return FALSE; + + return wxWindow::MSWWindowProc(nMsg, wParam, lParam); } -void wxChoice::Command(wxCommandEvent & event) +bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)) { - SetSelection (event.GetInt()); - ProcessCommand (event); + /* + 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): + + A. Selecting with just the arrows without opening the dropdown: + 1. CBN_SELENDOK + 2. CBN_SELCHANGE + + B. Opening dropdown with F4 and selecting with arrows: + 1. CBN_DROPDOWN + 2. many CBN_SELCHANGE while changing selection in the list + 3. CBN_SELENDOK + 4. CBN_CLOSEUP + + C. Selecting with the mouse: + 1. CBN_DROPDOWN + -- no intermediate CBN_SELCHANGEs -- + 2. CBN_SELENDOK + 3. CBN_CLOSEUP + 4. CBN_SELCHANGE + + 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. + */ + switch ( param ) + { + case CBN_DROPDOWN: + // we use this value both because we don't want to track selection + // using CB_GETCURSEL while the dropdown is opened and because we + // need to reset the selection back to it if it's eventually + // cancelled by user + m_lastAcceptedSelection = GetCurrentSelection(); + 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 ) + { + SetSelection(m_lastAcceptedSelection); + m_lastAcceptedSelection = 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); + } + + ProcessCommand(event); + } + break; + + // don't handle CBN_SELENDCANCEL: just leave m_lastAcceptedSelection + // valid and the selection will be undone in CBN_CLOSEUP above + + // 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 + + default: + return false; + } + + return true; } +WXHBRUSH wxChoice::MSWControlColor(WXHDC hDC, WXHWND hWnd) +{ + if ( !IsEnabled() ) + return MSWControlColorDisabled(hDC); + return wxChoiceBase::MSWControlColor(hDC, hWnd); +} +#endif // wxUSE_CHOICE && !(__SMARTPHONE__ && __WXWINCE__)