combobox.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        msw/combobox.cpp
// Purpose:     wxComboBox class
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id: combobox.cpp,v 1.112.2.1 2006/01/28 00:44:27 VZ Exp $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "combobox.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#if wxUSE_COMBOBOX

#ifndef WX_PRECOMP
    #include "wx/settings.h"
    #include "wx/log.h"
    // for wxEVT_COMMAND_TEXT_ENTER
    #include "wx/textctrl.h"
#endif

#include "wx/app.h"
#include "wx/combobox.h"
#include "wx/brush.h"
#include "wx/clipbrd.h"
#include "wx/msw/private.h"

#if wxUSE_TOOLTIPS
    #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
        #include <commctrl.h>
    #endif
    #include "wx/tooltip.h"
#endif // wxUSE_TOOLTIPS

// ----------------------------------------------------------------------------
// wxWin macros
// ----------------------------------------------------------------------------

#if wxUSE_EXTENDED_RTTI
WX_DEFINE_FLAGS( wxComboBoxStyle )

wxBEGIN_FLAGS( wxComboBoxStyle )
    // 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)

    wxFLAGS_MEMBER(wxCB_SIMPLE)
    wxFLAGS_MEMBER(wxCB_SORT)
    wxFLAGS_MEMBER(wxCB_READONLY)
    wxFLAGS_MEMBER(wxCB_DROPDOWN)

wxEND_FLAGS( wxComboBoxStyle )

IMPLEMENT_DYNAMIC_CLASS_XTI(wxComboBox, wxControl,"wx/combobox.h")

wxBEGIN_PROPERTIES_TABLE(wxComboBox)
    wxEVENT_PROPERTY( Select , wxEVT_COMMAND_COMBOBOX_SELECTED , wxCommandEvent )
    wxEVENT_PROPERTY( TextEnter , wxEVT_COMMAND_TEXT_ENTER , wxCommandEvent )

    // TODO DELEGATES
    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( Value ,wxString, SetValue, GetValue, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
    wxPROPERTY( Selection ,int, SetSelection, GetSelection, EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
    wxPROPERTY_FLAGS( WindowStyle , wxComboBoxStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
wxEND_PROPERTIES_TABLE()

wxBEGIN_HANDLERS_TABLE(wxComboBox)
wxEND_HANDLERS_TABLE()

wxCONSTRUCTOR_5( wxComboBox , wxWindow* , Parent , wxWindowID , Id , wxString , Value , wxPoint , Position , wxSize , Size )

#else

IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)

#endif

BEGIN_EVENT_TABLE(wxComboBox, wxControl)
    EVT_MENU(wxID_CUT, wxComboBox::OnCut)
    EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
    EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
    EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
    EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
    EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
    EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)

    EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
    EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
    EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
    EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
    EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
    EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
    EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
END_EVENT_TABLE()

// ----------------------------------------------------------------------------
// function prototypes
// ----------------------------------------------------------------------------

LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
                                            UINT message,
                                            WPARAM wParam,
                                            LPARAM lParam);

// ---------------------------------------------------------------------------
// global vars
// ---------------------------------------------------------------------------

// the pointer to standard radio button wnd proc
static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wnd proc for subclassed edit control
// ----------------------------------------------------------------------------

LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
                                            UINT message,
                                            WPARAM wParam,
                                            LPARAM lParam)
{
    HWND hwndCombo = ::GetParent(hWnd);
    wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);

    switch ( message )
    {
        // forward some messages to the combobox to generate the appropriate
        // wxEvents from them
        case WM_KEYUP:
        case WM_KEYDOWN:
        case WM_CHAR:
        case WM_SYSCHAR:
        case WM_SYSKEYDOWN:
        case WM_SYSKEYUP:
        case WM_SETFOCUS:
        case WM_KILLFOCUS:
            {
                wxComboBox *combo = wxDynamicCast(win, wxComboBox);
                if ( !combo )
                {
                    // we can get WM_KILLFOCUS while our parent is already half
                    // destroyed and hence doesn't look like a combobx any
                    // longer, check for it to avoid bogus assert failures
                    if ( !win->IsBeingDeleted() )
                    {
                        wxFAIL_MSG( _T("should have combo as parent") );
                    }
                }
                else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
                {
                    // handled by parent
                    return 0;
                }
            }
            break;

        case WM_GETDLGCODE:
            {
                wxCHECK_MSG( win, 0, _T("should have a parent") );

                if ( win->GetWindowStyle() & wxPROCESS_ENTER )
                {
                    // need to return a custom dlg code or we'll never get it
                    return DLGC_WANTMESSAGE;
                }
            }
            break;

        // deal with tooltips here
#if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
        case WM_NOTIFY:
            {
                wxCHECK_MSG( win, 0, _T("should have a parent") );

                NMHDR* hdr = (NMHDR *)lParam;
                if ( hdr->code == TTN_NEEDTEXT )
                {
                    wxToolTip *tooltip = win->GetToolTip();
                    if ( tooltip )
                    {
                        TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
                        ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
                    }

                    // processed
                    return 0;
                }
            }
            break;
#endif // wxUSE_TOOLTIPS
    }

    return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
}

// ----------------------------------------------------------------------------
// wxComboBox callbacks
// ----------------------------------------------------------------------------

WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
{
    // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
    //       set its colour correctly (to be the same as our own one)

    switch ( nMsg )
    {
        case CB_SETCURSEL:
            // Selection was set with SetSelection.  Update the value too.
            if ((int)wParam > GetCount())
                m_value.clear();
            else
                m_value = GetString(wParam);
            m_selectionOld = -1;
            break;

        case WM_SIZE:
        // wxStaticBox can generate this message, when modifying the control's style.
        // This causes the content of the combobox to be selected, for some reason.
        case WM_STYLECHANGED:
            {
                // combobox selection sometimes spontaneously changes when its
                // size changes, restore it to the old value if necessary
                long fromOld, toOld;
                GetSelection(&fromOld, &toOld);
                WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);

                long fromNew, toNew;
                GetSelection(&fromNew, &toNew);

                if ( fromOld != fromNew || toOld != toNew )
                {
                    SetSelection(fromOld, toOld);
                }

                return result;
            }
    }

    return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
}

bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
{
    switch ( msg )
    {
        case WM_CHAR:
            // for compatibility with wxTextCtrl, generate a special message
            // when Enter is pressed
            if ( wParam == VK_RETURN )
            {
                wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
                InitCommandEvent(event);
                event.SetString(GetValue());
                event.SetInt(GetSelection());
                if ( ProcessCommand(event) )
                {
                    // don't let the event through to the native control
                    // because it doesn't need it and may generate an annoying
                    // beep if it gets it
                    return true;
                }
            }
            // fall through

        case WM_SYSCHAR:
            return HandleChar(wParam, lParam, true /* isASCII */);

        case WM_SYSKEYDOWN:
        case WM_KEYDOWN:
            return HandleKeyDown(wParam, lParam);

        case WM_SYSKEYUP:
        case WM_KEYUP:
            return HandleKeyUp(wParam, lParam);

        case WM_SETFOCUS:
            return HandleSetFocus((WXHWND)wParam);

        case WM_KILLFOCUS:
            return HandleKillFocus((WXHWND)wParam);
    }

    return false;
}

bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
{
    wxString value;
    int sel = -1;
    switch ( param )
    {
        case CBN_SELENDOK:
        case CBN_SELCHANGE:
            sel = GetSelection();

            // we may sometimes get 2 CBN_SELCHANGE events or a CBN_SELENDOK
            // before CBN_SELCHANGE with the same index when the user selects
            // an item in the combobox -- ignore duplicates
            if ( sel > -1 && sel != m_selectionOld )
            {
                m_selectionOld = sel;

                // GetValue() would still return the old value from here but
                // according to the docs we should return the new value if the
                // user calls it in his event handler, so update internal
                // m_value
                m_value = GetString(sel);

                wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
                event.SetInt(sel);
                event.SetEventObject(this);
                event.SetString(m_value);
                ProcessCommand(event);
            }
            else // no valid selection
            {
                m_selectionOld = sel;

                // hence no EVT_TEXT neither
                break;
            }

            // fall through: for compability with wxGTK, also send the text
            // update event when the selection changes (this also seems more
            // logical as the text does change)

        case CBN_EDITCHANGE:
            {
                wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());

                // if sel != -1, value was initialized above (and we can't use
                // GetValue() here as it would return the old selection and we
                // want the new one)
                if ( sel == -1 )
                {
                    m_value = wxGetWindowText(GetHwnd());
                    m_selectionOld = -1;
                }
                else // we're synthesizing text updated event from sel change
                {
                    // We need to retrieve the current selection because the
                    // user may have changed it in the previous handler (for
                    // CBN_SELCHANGE above).
                    sel = GetSelection();
                    if ( sel > -1 )
                    {
                        m_value = GetString(sel);
                    }
                }

                event.SetString(m_value);
                event.SetEventObject(this);
                ProcessCommand(event);
            }
            break;

        default:
            return wxChoice::MSWCommand(param, id);
    }

    // let the def window proc have it by returning false, but do not pass the
    // message we've already handled here (notably CBN_SELCHANGE) to the base
    // class as it would generate another event for them
    return false;
}

WXHWND wxComboBox::GetEditHWND() const
{
    // this function should not be called for wxCB_READONLY controls, it is
    // the callers responsability to check this
    wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
                  _T("read-only combobox doesn't have any edit control") );

    POINT pt;
    pt.x = pt.y = 4;
    HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
    if ( !hwndEdit || hwndEdit == GetHwnd() )