/////////////////////////////////////////////////////////////////////////////
-// Name: choice.cpp
+// Name: src/msw/choice.cpp
// Purpose: wxChoice
// Author: Julian Smart
// Modified by: Vadim Zeitlin to derive from wxChoiceBase
// headers
// ----------------------------------------------------------------------------
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
- #pragma implementation "choice.h"
-#endif
-
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#if wxUSE_CHOICE && !(defined(__SMARTPHONE__) && defined(__WXWINCE__))
+#include "wx/choice.h"
+
#ifndef WX_PRECOMP
- #include "wx/choice.h"
#include "wx/utils.h"
+ #include "wx/app.h"
#include "wx/log.h"
#include "wx/brush.h"
#include "wx/settings.h"
#include "wx/msw/private.h"
-#if wxUSE_EXTENDED_RTTI
-WX_DEFINE_FLAGS( wxChoiceStyle )
-
-wxBEGIN_FLAGS( wxChoiceStyle )
- // new style border flags, we put them first to
- // use them for streaming out
- wxFLAGS_MEMBER(wxBORDER_SIMPLE)
- wxFLAGS_MEMBER(wxBORDER_SUNKEN)
- wxFLAGS_MEMBER(wxBORDER_DOUBLE)
- wxFLAGS_MEMBER(wxBORDER_RAISED)
- wxFLAGS_MEMBER(wxBORDER_STATIC)
- wxFLAGS_MEMBER(wxBORDER_NONE)
-
- // old style border flags
- wxFLAGS_MEMBER(wxSIMPLE_BORDER)
- wxFLAGS_MEMBER(wxSUNKEN_BORDER)
- wxFLAGS_MEMBER(wxDOUBLE_BORDER)
- wxFLAGS_MEMBER(wxRAISED_BORDER)
- wxFLAGS_MEMBER(wxSTATIC_BORDER)
- wxFLAGS_MEMBER(wxBORDER)
-
- // standard window styles
- wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
- wxFLAGS_MEMBER(wxCLIP_CHILDREN)
- wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
- wxFLAGS_MEMBER(wxWANTS_CHARS)
- wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
- wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
- wxFLAGS_MEMBER(wxVSCROLL)
- wxFLAGS_MEMBER(wxHSCROLL)
-
-wxEND_FLAGS( wxChoiceStyle )
-
-IMPLEMENT_DYNAMIC_CLASS_XTI(wxChoice, wxControl,"wx/choice.h")
-
-wxBEGIN_PROPERTIES_TABLE(wxChoice)
- wxEVENT_PROPERTY( Select , wxEVT_COMMAND_CHOICE_SELECTED , wxCommandEvent )
-
- wxPROPERTY( Font , wxFont , SetFont , GetFont , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
- wxPROPERTY_COLLECTION( Choices , wxArrayString , wxString , AppendString , GetStrings , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
- wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
- wxPROPERTY_FLAGS( WindowStyle , wxChoiceStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
-wxEND_PROPERTIES_TABLE()
-
-wxBEGIN_HANDLERS_TABLE(wxChoice)
-wxEND_HANDLERS_TABLE()
-
-wxCONSTRUCTOR_4( wxChoice , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size )
-#else
-IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl)
-#endif
-/*
- TODO PROPERTIES
- selection (long)
- content (list)
- item
-*/
-
// ============================================================================
// implementation
// ============================================================================
wxASSERT_MSG( !(style & wxCB_DROPDOWN) &&
!(style & wxCB_READONLY) &&
!(style & wxCB_SIMPLE),
- _T("this style flag is ignored by wxChoice, you ")
- _T("probably want to use a wxComboBox") );
+ 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);
return false;
- // choice/combobox normally has "white" (depends on colour scheme, of
- // course) background rather than inheriting the parent's background
- SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
-
// initialize the controls contents
for ( int i = 0; i < n; i++ )
{
}
// and now we may finally size the control properly (if needed)
- SetBestSize(size);
+ 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,
return msStyle;
}
+#ifndef EP_EDITTEXT
+ #define EP_EDITTEXT 1
+ #define ETS_NORMAL 1
+#endif
+
+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;
+
+ // FIXME: Use better dummy window?
+ wxWindow* wnd = wxTheApp->GetTopWindow();
+ if (!wnd)
+ return attrs;
+
+ attrs.font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
+
+ // 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);
+
+ // 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;
+}
+
wxChoice::~wxChoice()
{
- Free();
+ Clear();
}
// ----------------------------------------------------------------------------
// adding/deleting items to/from the list
// ----------------------------------------------------------------------------
-int wxChoice::DoAppend(const wxString& item)
+int wxChoice::DoInsertItems(const wxArrayStringsAdapter& items,
+ unsigned int pos,
+ void **clientData, wxClientDataType type)
{
- int n = (int)SendMessage(GetHwnd(), CB_ADDSTRING, 0, (LPARAM)item.c_str());
- if ( n == CB_ERR )
- {
- wxLogLastError(wxT("SendMessage(CB_ADDSTRING)"));
- }
- else // ok
- {
- // we need to refresh our size in order to have enough space for the
- // newly added items
- if ( !IsFrozen() )
- UpdateVisibleHeight();
- }
+ MSWAllocStorage(items, CB_INITSTORAGE);
- return n;
-}
+ const bool append = pos == GetCount();
-int wxChoice::DoInsert(const wxString& item, int pos)
-{
- wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into sorted list"));
- wxCHECK_MSG((pos>=0) && (pos<=GetCount()), -1, wxT("invalid index"));
+ // 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;
- int n = (int)SendMessage(GetHwnd(), CB_INSERTSTRING, pos, (LPARAM)item.c_str());
- if ( n == CB_ERR )
- {
- wxLogLastError(wxT("SendMessage(CB_INSERTSTRING)"));
- }
- else // ok
+ if ( append )
+ pos = 0;
+
+ int n = wxNOT_FOUND;
+ const unsigned numItems = items.GetCount();
+ for ( unsigned i = 0; i < numItems; ++i )
{
- if ( !IsFrozen() )
- UpdateVisibleHeight();
+ 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();
+
return n;
}
-void wxChoice::Delete(int n)
+void wxChoice::DoDeleteOneItem(unsigned int n)
{
- wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );
-
- if ( HasClientObjectData() )
- {
- delete GetClientObject(n);
- }
+ wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") );
SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
if ( !IsFrozen() )
- UpdateVisibleHeight();
+ MSWUpdateDropDownHeight();
+
+ InvalidateBestSize();
}
-void wxChoice::Clear()
+void wxChoice::DoClear()
{
- Free();
-
SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
if ( !IsFrozen() )
- UpdateVisibleHeight();
-}
+ MSWUpdateDropDownHeight();
-void wxChoice::Free()
-{
- if ( HasClientObjectData() )
- {
- size_t count = GetCount();
- for ( size_t n = 0; n < count; n++ )
- {
- delete GetClientObject(n);
- }
- }
+ InvalidateBestSize();
}
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
int wxChoice::GetSelection() const
+{
+ // 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);
}
// string list functions
// ----------------------------------------------------------------------------
-int wxChoice::GetCount() const
+unsigned int wxChoice::GetCount() const
{
- return (int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
+ return (unsigned int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
}
-int wxChoice::FindString(const wxString& s) const
+int wxChoice::FindString(const wxString& s, bool bCase) const
{
#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.
- int count = GetCount();
- for ( int i = 0; i < count; i++ )
+ 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, false) )
+ if (GetString(i).IsSameAs(s, bCase))
return i;
}
//passed to SendMessage, so we have to do it ourselves in that case
if ( s.empty() )
{
- int count = GetCount();
- for ( int i = 0; i < count; i++ )
- {
- if ( GetString(i).empty() )
- return i;
- }
-
- return wxNOT_FOUND;
+ 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.c_str());
+ int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
+ (WPARAM)-1, (LPARAM)s.wx_str());
- return pos == LB_ERR ? wxNOT_FOUND : pos;
+ return pos == LB_ERR ? wxNOT_FOUND : pos;
}
#endif // Watcom/!Watcom
}
-void wxChoice::SetString(int n, const wxString& s)
+void wxChoice::SetString(unsigned int n, const wxString& s)
{
- wxCHECK_RET( n >= 0 && n < GetCount(),
- wxT("invalid item index in wxChoice::SetString") );
+ wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::SetString") );
// we have to delete and add back the string as there is no way to change a
// string in place
- // we need to preserve the client data
- void *data;
- if ( m_clientDataItemsType != wxClientData_None )
- {
- data = DoGetItemClientData(n);
- }
- else // no client data
- {
- data = NULL;
- }
+ // 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);
+
+ // and also the selection if we're going to delete the item that was
+ // selected
+ const bool wasSelected = static_cast<int>(n) == GetSelection();
::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
- ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.c_str() );
+ ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.wx_str() );
- if ( data )
- {
- DoSetItemClientData(n, data);
- }
- //else: it's already NULL by default
+ // restore the client data
+ if ( oldData )
+ SetClientData(n, oldData);
+ else if ( oldObjData )
+ SetClientObject(n, oldObjData);
+
+ // and the selection
+ if ( wasSelected )
+ SetSelection(n);
+
+ // the width could have changed so the best size needs to be recomputed
+ InvalidateBestSize();
}
-wxString wxChoice::GetString(int n) const
+wxString wxChoice::GetString(unsigned int n) const
{
int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);
// client data
// ----------------------------------------------------------------------------
-void wxChoice::DoSetItemClientData( int n, void* clientData )
+void wxChoice::DoSetItemClientData(unsigned int n, void* clientData)
{
if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA,
n, (LPARAM)clientData) == CB_ERR )
}
}
-void* wxChoice::DoGetItemClientData( int n ) const
+void* wxChoice::DoGetItemClientData(unsigned int n) const
{
LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0);
if ( rc == CB_ERR )
return (void *)rc;
}
-void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
+// ----------------------------------------------------------------------------
+// wxMSW-specific geometry management
+// ----------------------------------------------------------------------------
+
+namespace
{
- DoSetItemClientData(n, clientData);
-}
-wxClientData* wxChoice::DoGetItemClientObject( int n ) const
+// 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;
+
+} // anonymous namespace
+
+void wxChoice::MSWUpdateVisibleHeight()
{
- return (wxClientData *)DoGetItemClientData(n);
+ if ( m_heightOwn != wxDefaultCoord )
+ {
+ ::SendMessage(GetHwnd(), CB_SETITEMHEIGHT,
+ (WPARAM)-1, m_heightOwn - COMBO_HEIGHT_ADJ);
+ }
}
-// ----------------------------------------------------------------------------
-// wxMSW specific helpers
-// ----------------------------------------------------------------------------
+#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::UpdateVisibleHeight()
+void wxChoice::MSWUpdateDropDownHeight()
{
// be careful to not change the width here
- DoSetSize(wxDefaultCoord, wxDefaultCoord, wxDefaultCoord, GetSize().y, wxSIZE_USE_EXISTING);
+ DoSetSize(wxDefaultCoord, wxDefaultCoord, wxDefaultCoord, GetSize().y,
+ wxSIZE_USE_EXISTING);
}
void wxChoice::DoMoveWindow(int x, int y, int width, int height)
void wxChoice::DoGetSize(int *w, int *h) const
{
+ 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 normally it isn't... I have no idea about what to do with
- // this
- wxControl::DoGetSize(w, h);
+ // 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)
{
- int heightOrig = height;
+ 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
- if ( height != wxDefaultCoord )
+ // 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))
{
- // don't make the drop down list too tall, arbitrarily limit it to 40
- // items max and also don't leave it empty
- size_t nItems = GetCount();
if ( !nItems )
nItems = 9;
- else if ( nItems > 24 )
- nItems = 24;
-
- // add space for the drop down list
- const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
- height += hItem*(nItems + 1);
+ else if ( nItems > 30 )
+ nItems = 30;
}
+
+ const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
+ int heightWithItems = 0;
+ if (!HasFlag(wxCB_SIMPLE))
+ // The extra item (" + 1") is required to prevent a vertical
+ // scrollbar from appearing with comctl32.dll versions earlier
+ // than 6.0 (such as found in Win2k).
+ heightWithItems = height + hItem*(nItems + 1);
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 do it when using the deferred sizing -- in this case it
+ // will be done from MSWEndDeferWindowPos()
+#if wxUSE_DEFERRED_SIZING
+ if ( m_pendingSize == wxDefaultSize )
{
- // We cannot pass wxDefaultCoord as height to wxControl. wxControl uses
- // wxGetWindowRect() to determine the current height of the combobox,
- // and then again sets the combobox's height to that value. Unfortunately,
- // wxGetWindowRect doesn't include the dropdown list's height (at least
- // on Win2K), so this would result in a combobox with dropdown height of
- // 1 pixel. We have to determine the default height ourselves and call
- // wxControl with that value instead.
- int w, h;
- RECT r;
- DoGetSize(&w, &h);
- if (::SendMessage(GetHwnd(), CB_GETDROPPEDCONTROLRECT, 0, (LPARAM) &r) != 0)
- {
- height = h + r.bottom - r.top;
- }
+ // not using deferred sizing, update it immediately
+ MSWUpdateVisibleHeight();
}
-
- wxControl::DoSetSize(x, y, width, height, sizeFlags);
-
- // I'm commenting this out since the code appears to make choices
- // and comboxes too high when they have associated sizers. I'm sure this
- // is not the end of the story, which is why I'm leaving it #if'ed out for
- // now. JACS.
-#if 0
- // if the height specified for the visible part of the control is
- // different from the current one, we need to change it separately
- // as it is not affected by normal WM_SETSIZE
- if ( height != wxDefaultCoord )
+ else // in the middle of deferred sizing
{
- const int delta = heightOrig - GetSize().y;
- if ( delta )
- {
- int h = ::SendMessage(GetHwnd(), CB_GETITEMHEIGHT, (WPARAM)-1, 0);
- SendMessage(GetHwnd(), CB_SETITEMHEIGHT, (WPARAM)-1, h + delta);
- }
+ // 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
- wxUnusedVar(heightOrig);
-#endif
+#else // !wxUSE_DEFERRED_SIZING
+ // always update the visible height immediately
+ MSWUpdateVisibleHeight();
+#endif // wxUSE_DEFERRED_SIZING
}
wxSize wxChoice::DoGetBestSize() const
{
// find the widest string
int wChoice = 0;
- const size_t nItems = GetCount();
- for ( size_t i = 0; i < nItems; i++ )
+ int hChoice;
+ const unsigned int nItems = GetCount();
+ for ( unsigned int i = 0; i < nItems; i++ )
{
int wLine;
GetTextExtent(GetString(i), &wLine, NULL);
// 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;
+}
- return wxSize(wChoice, EDIT_HEIGHT_FROM_CHAR_HEIGHT(GetCharHeight()));
+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;
}
+// ----------------------------------------------------------------------------
+// MSW message handlers
+// ----------------------------------------------------------------------------
+
WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
{
switch ( nMsg )
bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
{
- if ( param != CBN_SELCHANGE)
+ /*
+ 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 )
{
- // "selection changed" is the only event we're after
- return false;
- }
+ 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;
- int n = GetSelection();
- if (n > -1)
- {
- wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
- event.SetInt(n);
- event.SetEventObject(this);
- event.SetString(GetStringSelection());
- if ( HasClientObjectData() )
- event.SetClientObject( GetClientObject(n) );
- else if ( HasClientUntypedData() )
- event.SetClientData( GetClientData(n) );
- ProcessCommand(event);
+ 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;
}
#endif // wxUSE_CHOICE && !(__SMARTPHONE__ && __WXWINCE__)
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projects / wxWidgets.git / blobdiff