textctrlce.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

        {
            len--;
        }

        buf[len] = 0;
        tmp.SetLength(len);
    }

    return str;
}

void wxTextCtrl::SetMaxLength(unsigned long len)
{
    ::SendMessage(GetBuddyHwnd(), EM_LIMITTEXT, len, 0);
}

// ----------------------------------------------------------------------------
// Undo/redo
// ----------------------------------------------------------------------------

void wxTextCtrl::Undo()
{
    if (CanUndo())
    {
        ::SendMessage(GetBuddyHwnd(), EM_UNDO, 0, 0);
    }
}

void wxTextCtrl::Redo()
{
    if (CanRedo())
    {
        ::SendMessage(GetBuddyHwnd(), EM_UNDO, 0, 0);
    }
}

bool wxTextCtrl::CanUndo() const
{
    return ::SendMessage(GetBuddyHwnd(), EM_CANUNDO, 0, 0) != 0;
}

bool wxTextCtrl::CanRedo() const
{
    return ::SendMessage(GetBuddyHwnd(), EM_CANUNDO, 0, 0) != 0;
}

// ----------------------------------------------------------------------------
// caret handling
// ----------------------------------------------------------------------------

// ----------------------------------------------------------------------------
// implemenation details
// ----------------------------------------------------------------------------

void wxTextCtrl::Command(wxCommandEvent & event)
{
    SetValue(event.GetString());
    ProcessCommand (event);
}

// ----------------------------------------------------------------------------
// kbd input processing
// ----------------------------------------------------------------------------

void wxTextCtrl::OnChar(wxKeyEvent& event)
{
    switch ( event.GetKeyCode() )
    {
        case WXK_RETURN:
            if ( !HasFlag(wxTE_MULTILINE) )
            {
                wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
                InitCommandEvent(event);
                event.SetString(GetValue());
                if ( GetEventHandler()->ProcessEvent(event) )
                    return;
            }
            //else: multiline controls need Enter for themselves

            break;

        case WXK_TAB:
            // ok, so this is getting absolutely ridiculous but I don't see
            // any other way to fix this bug: when a multiline text control is
            // inside a wxFrame, we need to generate the navigation event as
            // otherwise nothing happens at all, but when the same control is
            // created inside a dialog, IsDialogMessage() *does* switch focus
            // all by itself and so if we do it here as well, it is advanced
            // twice and goes to the next control... to prevent this from
            // happening we're doing this ugly check, the logic being that if
            // we don't have focus then it had been already changed to the next
            // control
            //
            // the right thing to do would, of course, be to understand what
            // the hell is IsDialogMessage() doing but this is beyond my feeble
            // forces at the moment unfortunately
            if ( !(m_windowStyle & wxTE_PROCESS_TAB))
            {
                if ( FindFocus() == this )
                {
                    int flags = 0;
                    if (!event.ShiftDown())
                        flags |= wxNavigationKeyEvent::IsForward ;
                    if (event.ControlDown())
                        flags |= wxNavigationKeyEvent::WinChange ;
                    if (Navigate(flags))
                        return;
                }
            }
            else
            {
                // Insert tab since calling the default Windows handler
                // doesn't seem to do it
                WriteText(wxT("\t"));
            }
            break;
    }

    // no, we didn't process it
    event.Skip();
}

WXLRESULT wxTextCtrl::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
{
    WXLRESULT lRc = wxTextCtrlBase::MSWWindowProc(nMsg, wParam, lParam);

    if ( nMsg == WM_GETDLGCODE )
    {
        // we always want the chars and the arrows: the arrows for navigation
        // and the chars because we want Ctrl-C to work even in a read only
        // control
        long lDlgCode = DLGC_WANTCHARS | DLGC_WANTARROWS;

        if ( IsEditable() )
        {
            // we may have several different cases:
            // 1. normal case: both TAB and ENTER are used for dlg navigation
            // 2. ctrl which wants TAB for itself: ENTER is used to pass to the
            //    next control in the dialog
            // 3. ctrl which wants ENTER for itself: TAB is used for dialog
            //    navigation
            // 4. ctrl which wants both TAB and ENTER: Ctrl-ENTER is used to go
            //    to the next control

            // the multiline edit control should always get <Return> for itself
            if ( HasFlag(wxTE_PROCESS_ENTER) || HasFlag(wxTE_MULTILINE) )
                lDlgCode |= DLGC_WANTMESSAGE;

            if ( HasFlag(wxTE_PROCESS_TAB) )
                lDlgCode |= DLGC_WANTTAB;

            lRc |= lDlgCode;
        }
        else // !editable
        {
            // NB: use "=", not "|=" as the base class version returns the
            //     same flags is this state as usual (i.e. including
            //     DLGC_WANTMESSAGE). This is strange (how does it work in the
            //     native Win32 apps?) but for now live with it.
            lRc = lDlgCode;
        }
    }

    return lRc;
}

// ----------------------------------------------------------------------------
// text control event processing
// ----------------------------------------------------------------------------

bool wxTextCtrl::SendUpdateEvent()
{
    // is event reporting suspended?
    if ( m_suppressNextUpdate )
    {
        // do process the next one
        m_suppressNextUpdate = false;

        return false;
    }

    wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
    InitCommandEvent(event);
    event.SetString(GetValue());

    return ProcessCommand(event);
}

bool wxTextCtrl::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
{
    switch ( param )
    {
        case EN_SETFOCUS:
        case EN_KILLFOCUS:
            {
                wxFocusEvent event(param == EN_KILLFOCUS ? wxEVT_KILL_FOCUS
                                                         : wxEVT_SET_FOCUS,
                                   m_windowId);
                event.SetEventObject(this);
                GetEventHandler()->ProcessEvent(event);
            }
            break;

        case EN_CHANGE:
            SendUpdateEvent();
            break;

        case EN_MAXTEXT:
            // the text size limit has been hit -- try to increase it
            if ( !AdjustSpaceLimit() )
            {
                wxCommandEvent event(wxEVT_COMMAND_TEXT_MAXLEN, m_windowId);
                InitCommandEvent(event);
                event.SetString(GetValue());
                ProcessCommand(event);
            }
            break;

            // the other edit notification messages are not processed
        default:
            return false;
    }

    // processed
    return true;
}

bool wxTextCtrl::AdjustSpaceLimit()
{
    unsigned int limit = ::SendMessage(GetBuddyHwnd(), EM_GETLIMITTEXT, 0, 0);

    // HACK: we try to automatically extend the limit for the amount of text
    //       to allow (interactively) entering more than 64Kb of text under
    //       Win9x but we shouldn't reset the text limit which was previously
    //       set explicitly with SetMaxLength()
    //
    //       we could solve this by storing the limit we set in wxTextCtrl but
    //       to save space we prefer to simply test here the actual limit
    //       value: we consider that SetMaxLength() can only be called for
    //       values < 32Kb
    if ( limit < 0x8000 )
    {
        // we've got more text than limit set by SetMaxLength()
        return false;
    }

    unsigned int len = ::GetWindowTextLength(GetBuddyHwnd());
    if ( len >= limit )
    {
        limit = len + 0x8000;    // 32Kb

        if ( limit > 0xffff )
        {
            // this will set it to a platform-dependent maximum (much more
            // than 64Kb under NT)
            limit = 0;
        }

        ::SendMessage(GetBuddyHwnd(), EM_LIMITTEXT, limit, 0L);
    }

    // we changed the limit
    return true;
}

bool wxTextCtrl::AcceptsFocus() const
{
    // we don't want focus if we can't be edited unless we're a multiline
    // control because then it might be still nice to get focus from keyboard
    // to be able to scroll it without mouse
    return (IsEditable() || IsMultiLine()) && wxControl::AcceptsFocus();
}

void wxTextCtrl::DoMoveWindow(int x, int y, int width, int height)
{
    int widthBtn = GetBestSpinnerSize(IsVertical(GetWindowStyle())).x / 2;
    int widthText = width - widthBtn - MARGIN_BETWEEN;
    if ( widthText <= 0 )
    {
        wxLogDebug(_T("not enough space for wxSpinCtrl!"));
    }

    if ( !::MoveWindow(GetBuddyHwnd(), x, y, widthText, height, TRUE) )
    {
        wxLogLastError(wxT("MoveWindow(buddy)"));
    }

    x += widthText + MARGIN_BETWEEN;
    if ( !::MoveWindow(GetHwnd(), x, y, widthBtn, height, TRUE) )
    {
        wxLogLastError(wxT("MoveWindow"));
    }
}

wxSize wxTextCtrl::DoGetBestSize() const
{
    int cx, cy;
    wxGetCharSize(GetBuddyHwnd(), &cx, &cy, GetFont());

    int wText = DEFAULT_ITEM_WIDTH;

    int hText = cy;
    if ( m_windowStyle & wxTE_MULTILINE )
    {
        hText *= wxMax(GetNumberOfLines(), 5);
    }
    //else: for single line control everything is ok

    // we have to add the adjustments for the control height only once, not
    // once per line, so do it after multiplication above
    hText += EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy) - cy;

    return wxSize(wText, hText);
}

// ----------------------------------------------------------------------------
// standard handlers for standard edit menu events
// ----------------------------------------------------------------------------

void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
{
    Cut();
}

void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
{
    Copy();
}

void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
{
    Paste();
}

void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
{
    Undo();
}

void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
{
    Redo();
}

void wxTextCtrl::OnDelete(wxCommandEvent& WXUNUSED(event))
{
    long from, to;
    GetSelection(& from, & to);
    if (from != -1 && to != -1)
        Remove(from, to);
}

void wxTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
{
    SetSelection(-1, -1);
}

void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
{
    event.Enable( CanCut() );
}

void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
{
    event.Enable( CanCopy() );
}

void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
{
    event.Enable( CanPaste() );
}

void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
{
    event.Enable( CanUndo() );
}

void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
{
    event.Enable( CanRedo() );
}

void wxTextCtrl::OnUpdateDelete(wxUpdateUIEvent& event)
{
    long from, to;
    GetSelection(& from, & to);
    event.Enable(from != -1 && to != -1 && from != to && IsEditable()) ;
}

void wxTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
{
    event.Enable(GetLastPosition() > 0);
}

void wxTextCtrl::OnSetFocus(wxFocusEvent& WXUNUSED(event))
{
    // be sure the caret remains invisible if the user had hidden it
    if ( !m_isNativeCaretShown )
    {
        ::HideCaret(GetBuddyHwnd());
    }
}

#endif // wxUSE_TEXTCTRL && __SMARTPHONE__ && __WXWINCE__