choice.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        choice.cpp
// Purpose:     wxChoice
// Author:      Julian Smart
// Modified by: Vadim Zeitlin to derive from wxChoiceBase
// Created:     04/01/98
// RCS-ID:      $Id: choice.cpp,v 1.107.2.3 2006/03/30 09:19:04 JS Exp $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// 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"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#if wxUSE_CHOICE && !(defined(__SMARTPHONE__) && defined(__WXWINCE__))

#ifndef WX_PRECOMP
    #include "wx/choice.h"
    #include "wx/utils.h"
    #include "wx/log.h"
    #include "wx/brush.h"
    #include "wx/settings.h"
#endif

#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
// ============================================================================

// ----------------------------------------------------------------------------
// 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),
                  _T("this style flag is ignored by wxChoice, you ")
                  _T("probably want to use a wxComboBox") );

    return CreateAndInit(parent, id, pos, size, n, choices, style,
                         validator, name);
}

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;


    // 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++ )
    {
        Append(choices[i]);
    }

    // and now we may finally size the control properly (if needed)
    SetBestSize(size);

    return true;
}

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)
{
    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);
}

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;
}

wxChoice::~wxChoice()
{
    Free();
}

// ----------------------------------------------------------------------------
// adding/deleting items to/from the list
// ----------------------------------------------------------------------------

int wxChoice::DoAppend(const wxString& item)
{
    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();
    }

    InvalidateBestSize();
    return n;
}

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"));

    int n = (int)SendMessage(GetHwnd(), CB_INSERTSTRING, pos, (LPARAM)item.c_str());
    if ( n == CB_ERR )
    {
        wxLogLastError(wxT("SendMessage(CB_INSERTSTRING)"));
    }
    else // ok
    {
        if ( !IsFrozen() )
            UpdateVisibleHeight();
    }

    InvalidateBestSize();
    return n;
}

void wxChoice::Delete(int n)
{
    wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );

    if ( HasClientObjectData() )
    {
        delete GetClientObject(n);
    }

    SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);

    if ( !IsFrozen() )
        UpdateVisibleHeight();

    InvalidateBestSize();
}

void wxChoice::Clear()
{
    Free();

    SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);

    if ( !IsFrozen() )
        UpdateVisibleHeight();

    InvalidateBestSize();
}

void wxChoice::Free()
{
    if ( HasClientObjectData() )
    {
        size_t count = GetCount();
        for ( size_t n = 0; n < count; n++ )
        {
            delete GetClientObject(n);
        }
    }
}

// ----------------------------------------------------------------------------
// selection
// ----------------------------------------------------------------------------

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);
}

void wxChoice::SetSelection(int n)
{
    SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);
}

// ----------------------------------------------------------------------------
// string list functions
// ----------------------------------------------------------------------------

int wxChoice::GetCount() const
{
    return (int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
}

int wxChoice::FindString(const wxString& s) 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++ )
    {
        // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
        if ( GetString(i).IsSameAs(s, false) )
            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() )
   {
     int count = GetCount();
     for ( int i = 0; i < count; i++ )
     {
       if ( GetString(i).empty() )
           return i;
     }

     return wxNOT_FOUND;