自学教程：C++ HandleWindowEvent函数代码示例

bool wxSpinButton::OS2OnScroll( int    WXUNUSED(nOrientation),                                WXWORD WXUNUSED(wParam),                                WXWORD wPos,                                WXHWND hControl ){    wxCHECK_MSG(hControl, false, wxT("scrolling what?") );    wxSpinEvent vEvent( wxEVT_SCROLL_THUMBTRACK, m_windowId );    int nVal = (int)wPos;    // cast is important for negative values!    vEvent.SetPosition(nVal);    vEvent.SetEventObject(this);    return(HandleWindowEvent(vEvent));} // end of wxSpinButton::OS2OnScroll

void wxScrollBar::TriggerScrollEvent( wxEventType scrollEvent ){    int position = GetPeer()->GetValue();    int minPos = 0 ;    int maxPos = GetPeer()->GetMaximum();    int nScrollInc = 0;    if ( scrollEvent == wxEVT_SCROLL_LINEUP )    {        nScrollInc = -1;    }    else if ( scrollEvent == wxEVT_SCROLL_LINEDOWN )    {        nScrollInc = 1;    }    else if ( scrollEvent == wxEVT_SCROLL_PAGEUP )    {        nScrollInc = -m_pageSize;    }    else if ( scrollEvent == wxEVT_SCROLL_PAGEDOWN )    {        nScrollInc = m_pageSize;    }    int new_pos = position + nScrollInc;    if (new_pos < minPos)        new_pos = minPos;    else if (new_pos > maxPos)        new_pos = maxPos;    if ( nScrollInc )        SetThumbPosition( new_pos );    wxScrollEvent event( scrollEvent, m_windowId );    if ( m_windowStyle & wxHORIZONTAL )        event.SetOrientation( wxHORIZONTAL );    else        event.SetOrientation( wxVERTICAL );    event.SetPosition( new_pos );    event.SetEventObject( this );    wxWindow* window = GetParent();    if (window && window->MacIsWindowScrollbar( this ))        // this is hardcoded        window->MacOnScroll( event );    else        HandleWindowEvent( event );}

void wxGLCanvas::OnInternalIdle(){    if (m_exposed)    {        wxPaintEvent event( GetId() );        event.SetEventObject( this );        HandleWindowEvent( event );        m_exposed = false;        GetUpdateRegion().Clear();    }    wxWindow::OnInternalIdle();}

void wxFileButton::OnDialogOK(wxCommandEvent& ev){    // the wxFileDialog associated with the GtkFileChooserButton has been closed    // using the OK button, thus the selected file has changed...    if (ev.GetId() == wxID_OK)    {        // ...update our path        UpdatePathFromDialog(m_dialog);        // ...and fire an event        wxFileDirPickerEvent event(wxEVT_FILEPICKER_CHANGED, this, GetId(), m_path);        HandleWindowEvent(event);    }}

void wxControlWithItemsBase::SendSelectionChangedEvent(wxEventType eventType){    const int n = GetSelection();    if ( n == wxNOT_FOUND )        return;    wxCommandEvent event(eventType, m_windowId);    event.SetInt(n);    event.SetEventObject(this);    event.SetString(GetStringSelection());    InitCommandEventWithItems(event, n);    HandleWindowEvent(event);}

void wxTopLevelWindowGTK::DoSetSize( int x, int y, int width, int height, int sizeFlags ){    wxCHECK_RET( m_widget, wxT("invalid frame") );    // deal with the position first    int old_x = m_x;    int old_y = m_y;    if ( !(sizeFlags & wxSIZE_ALLOW_MINUS_ONE) )    {        // -1 means "use existing" unless the flag above is specified        if ( x != -1 )            m_x = x;        if ( y != -1 )            m_y = y;    }    else // wxSIZE_ALLOW_MINUS_ONE    {        m_x = x;        m_y = y;    }    if ( m_x != old_x || m_y != old_y )    {        gtk_window_move( GTK_WINDOW(m_widget), m_x, m_y );    }    const wxSize oldSize(m_width, m_height);    if (width >= 0)        m_width = width;    if (height >= 0)        m_height = height;    ConstrainSize();    if (m_width < 1) m_width = 1;    if (m_height < 1) m_height = 1;    if (m_width != oldSize.x || m_height != oldSize.y)    {        m_deferShowAllowed = true;        m_useCachedClientSize = false;        int w, h;        GTKDoGetSize(&w, &h);        gtk_window_resize(GTK_WINDOW(m_widget), w, h);        DoGetClientSize(&m_clientWidth, &m_clientHeight);        wxSizeEvent event(GetSize(), GetId());        event.SetEventObject(this);        HandleWindowEvent(event);    }}

// process a WM_COMMAND generated by the buddy text controlbool wxSpinCtrl::ProcessTextCommand(WXWORD cmd, WXWORD WXUNUSED(id)){    if ( (cmd == EN_CHANGE) && (!m_blockEvent ))    {        wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());        event.SetEventObject(this);        wxString val = wxGetWindowText(m_hwndBuddy);        event.SetString(val);        event.SetInt(GetValue());        return HandleWindowEvent(event);    }    // not processed    return false;}

bool wxSpinCtrl::ProcessTextCommand( WXWORD wCmd,                                     WXWORD WXUNUSED(wId) ){    switch (wCmd)    {        case SPBN_CHANGE:        {            wxCommandEvent vEvent( wxEVT_COMMAND_TEXT_UPDATED, GetId() );            vEvent.SetEventObject(this);            wxString sVal = wxGetWindowText(m_hWndBuddy);            vEvent.SetString(sVal);            vEvent.SetInt(GetValue());            return (HandleWindowEvent(vEvent));        }        case SPBN_SETFOCUS:        case SPBN_KILLFOCUS:        {            wxFocusEvent vEvent( wCmd == EN_KILLFOCUS ? wxEVT_KILL_FOCUS : wxEVT_SET_FOCUS                                ,m_windowId                               );            vEvent.SetEventObject(this);            return(HandleWindowEvent(vEvent));        }        default:            break;    }    //    // Not processed    //    return false;} // end of wxSpinCtrl::ProcessTextCommand

// Only allow toggle if returns truebool wxToolBarBase::OnLeftClick(int toolid, bool toggleDown){    wxCommandEvent event(wxEVT_TOOL, toolid);    event.SetEventObject(this);    // we use SetInt() to make wxCommandEvent::IsChecked() return toggleDown    event.SetInt((int)toggleDown);    // and SetExtraLong() for backwards compatibility    event.SetExtraLong((long)toggleDown);    // Send events to this toolbar instead (and thence up the window hierarchy)    HandleWindowEvent(event);    return true;}

void wxSpinCtrl::OnSpinChange(  wxSpinEvent&                      rEventSpin){    wxCommandEvent                  vEvent( wxEVT_COMMAND_SPINCTRL_UPDATED                                           ,GetId()                                          );    vEvent.SetEventObject(this);    vEvent.SetInt(rEventSpin.GetPosition());    (void)HandleWindowEvent(vEvent);    if (rEventSpin.GetSkipped())    {        vEvent.Skip();    }} // end of wxSpinCtrl::OnSpinChange

bool wxTopLevelWindowX11::Show(bool show){    if (show)    {        wxSizeEvent event(GetSize(), GetId());        event.SetEventObject(this);        HandleWindowEvent(event);        m_needResizeInIdle = false;    }    bool ret = wxWindowX11::Show(show);    return ret;}

bool wxListBoxBase::SendEvent(wxEventType evtType, int item, bool selected){    wxCommandEvent event(evtType, GetId());    event.SetEventObject(this);    event.SetInt(item);    event.SetString(GetString(item));    event.SetExtraLong(selected);    if ( HasClientObjectData() )        event.SetClientObject(GetClientObject(item));    else if ( HasClientUntypedData() )        event.SetClientData(GetClientData(item));    return HandleWindowEvent(event);}

bool wxDatePickerCtrl::MSWOnDateTimeChange(const NMDATETIMECHANGE& dtch){    wxDateTime dt;    if ( dtch.dwFlags == GDT_VALID )        dt.SetFromMSWSysDate(dtch.st);    // filter out duplicate DTN_DATETIMECHANGE events which the native    // control sends us when using wxDP_DROPDOWN style    if ( (m_date.IsValid() == dt.IsValid()) &&            (!m_date.IsValid() || dt == m_date) )        return false;    m_date = dt;    wxDateEvent event(this, dt, wxEVT_DATE_CHANGED);    return HandleWindowEvent(event);}

bool wxControl::MSWOnNotify(int idCtrl,                            WXLPARAM lParam,                            WXLPARAM* result){    wxEventType eventType wxDUMMY_INITIALIZE(wxEVT_NULL);    NMHDR *hdr = (NMHDR*) lParam;    switch ( hdr->code )    {        case NM_CLICK:            eventType = wxEVT_COMMAND_LEFT_CLICK;            break;        case NM_DBLCLK:            eventType = wxEVT_COMMAND_LEFT_DCLICK;            break;        case NM_RCLICK:            eventType = wxEVT_COMMAND_RIGHT_CLICK;            break;        case NM_RDBLCLK:            eventType = wxEVT_COMMAND_RIGHT_DCLICK;            break;        case NM_SETFOCUS:            eventType = wxEVT_COMMAND_SET_FOCUS;            break;        case NM_KILLFOCUS:            eventType = wxEVT_COMMAND_KILL_FOCUS;            break;        case NM_RETURN:            eventType = wxEVT_COMMAND_ENTER;            break;        default:            return wxWindow::MSWOnNotify(idCtrl, lParam, result);    }    wxCommandEvent event(wxEVT_NULL, m_windowId);    event.SetEventType(eventType);    event.SetEventObject(this);    return HandleWindowEvent(event);}

bool wxListBox::OS2Command(  WXUINT                            uParam, WXWORD                            WXUNUSED(wId)){    wxEventType                     eEvtType;    if (uParam == LN_SELECT)    {        eEvtType = wxEVT_LISTBOX;    }    else if (uParam == LN_ENTER)    {        eEvtType = wxEVT_LISTBOX_DCLICK;    }    else    {        //        // Some event we're not interested in        //        return false;    }    wxCommandEvent                  vEvent( eEvtType                                           ,m_windowId                                          );    vEvent.SetEventObject(this);    wxArrayInt aSelections;    int        n;    int        nCount = GetSelections(aSelections);    if (nCount > 0)    {        n = aSelections[0];        if (HasClientObjectData())            vEvent.SetClientObject(GetClientObject(n));        else if ( HasClientUntypedData() )            vEvent.SetClientData(GetClientData(n));        vEvent.SetString(GetString(n));    }    else    {        n = -1;    }    vEvent.SetInt(n);    return HandleWindowEvent(vEvent);} // end of wxListBox::OS2Command

bool wxSpinButton::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,                               WXWORD pos, WXHWND control){    wxCHECK_MSG( control, false, wxT("scrolling what?") );    if ( wParam != SB_THUMBPOSITION )    {        // probable SB_ENDSCROLL - we don't react to it        return false;    }    wxSpinEvent event(wxEVT_SCROLL_THUMBTRACK, m_windowId);    event.SetPosition((short)pos);    // cast is important for negative values!    event.SetEventObject(this);    return HandleWindowEvent(event);}

void wxSpinCtrl::OnChar (  wxKeyEvent&                       rEvent){    switch (rEvent.GetKeyCode())    {        case WXK_RETURN:            {                wxCommandEvent              vEvent( wxEVT_COMMAND_TEXT_ENTER                                                   ,m_windowId                                                  );                wxString                    sVal = wxGetWindowText(m_hWndBuddy);                InitCommandEvent(vEvent);                vEvent.SetString(sVal);                vEvent.SetInt(GetValue());                if (HandleWindowEvent(vEvent))                    return;                break;            }        case WXK_TAB:            //            // Always produce navigation event - even if we process TAB            // ourselves the fact that we got here means that the user code            // decided to skip processing of this TAB - probably to let it            // do its default job.            //            {                wxNavigationKeyEvent        vEventNav;                vEventNav.SetDirection(!rEvent.ShiftDown());                vEventNav.SetWindowChange(rEvent.ControlDown());                vEventNav.SetEventObject(this);                if (GetParent()->HandleWindowEvent(vEventNav))                    return;            }            break;    }    //    // No, we didn't process it    //    rEvent.Skip();} // end of wxSpinCtrl::OnChar

bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)){    if ((param == LBN_SELCHANGE) && HasMultipleSelection())    {        CalcAndSendEvent();        return true;    }    wxEventType evtType;    int n;    if ( param == LBN_SELCHANGE )    {        evtType = wxEVT_COMMAND_LISTBOX_SELECTED;        n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);        // NB: conveniently enough, LB_ERR is the same as wxNOT_FOUND    }    else if ( param == LBN_DBLCLK )    {        evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;        n = HitTest(ScreenToClient(wxGetMousePosition()));    }    else    {        // some event we're not interested in        return false;    }    // retrieve the affected item    if ( n == wxNOT_FOUND )        return false;    wxCommandEvent event(evtType, m_windowId);    event.SetEventObject(this);    if ( HasClientObjectData() )        event.SetClientObject( GetClientObject(n) );    else if ( HasClientUntypedData() )        event.SetClientData( GetClientData(n) );    event.SetString(GetString(n));    event.SetInt(n);    return HandleWindowEvent(event);}

bool wxNonOwnedWindow::Show(bool show){    if ( !wxWindow::Show(show) )        return false;    if ( m_nowpeer )        m_nowpeer->Show(show);    if ( show )    {        // because apps expect a size event to occur at this moment        wxSizeEvent event(GetSize() , m_windowId);        event.SetEventObject(this);        HandleWindowEvent(event);    }    return true ;}

void wxChoice::SendSelectionChangedEvent(wxEventType evt_type){    if (!m_hasVMT)        return;    if (GetSelection() == -1)        return;    wxCommandEvent event( evt_type, GetId() );    int n = GetSelection();    event.SetInt( n );    event.SetString( GetStringSelection() );    event.SetEventObject( this );    InitCommandEventWithItems( event, n );    HandleWindowEvent( event );}

bool wxFrame::HandleMenuSelect(WXEVENTPTR event){    const EventType *palmEvent = (EventType *)event;    const int ItemID = palmEvent->data.menu.itemID;    if (!m_frameMenuBar)        return false;    const int item = m_frameMenuBar->ProcessCommand(ItemID);    if (item==-1)        return false;    wxCommandEvent commandEvent(wxEVT_COMMAND_MENU_SELECTED, item);    commandEvent.SetEventObject(this);    HandleWindowEvent(commandEvent);    return true;}

bool wxSlider::SendScrollEvent(WXEVENTPTR event){    const EventType* palmEvent = (EventType*)event;    int newPos = ValueInvertOrNot(palmEvent->data.ctlRepeat.value);    if ( newPos == m_oldPos )    {        // nothing changed since last event        return false;    }    m_oldPos = newPos;    // first track event    wxScrollEvent eventWx(wxEVT_SCROLL_THUMBTRACK, GetId());    eventWx.SetPosition(newPos);    eventWx.SetEventObject(this);    return HandleWindowEvent(eventWx);}

void wxComboBox::OnChar( wxKeyEvent &event ){    if ( event.GetKeyCode() == WXK_RETURN )    {        // GTK automatically selects an item if its in the list        wxCommandEvent eventEnter(wxEVT_TEXT_ENTER, GetId());        eventEnter.SetString( GetValue() );        eventEnter.SetInt( GetSelection() );        eventEnter.SetEventObject( this );        if (!HandleWindowEvent( eventEnter ))        {            // This will invoke the dialog default action, such            // as the clicking the default button.            wxWindow *top_frame = m_parent;#if defined(__INTEL_COMPILER) && 1 /* VDM auto patch */#   pragma ivdep#   pragma swp#   pragma unroll#   pragma prefetch#   if 0#       pragma simd noassert#   endif#endif /* VDM auto patch */            while (top_frame->GetParent() && !(top_frame->IsTopLevel()))                top_frame = top_frame->GetParent();            if (top_frame && GTK_IS_WINDOW(top_frame->m_widget))            {                GtkWindow *window = GTK_WINDOW(top_frame->m_widget);                if (window->default_widget)                        gtk_widget_activate (window->default_widget);            }        }        // Catch GTK event so that GTK doesn't open the drop        // down list upon RETURN.        return;    }    event.Skip();}

bool wxNonOwnedWindow::Show(bool show){    // NB: this calls wxWindow::Show() and so ensures DoRefreshWindow() is    //     called on the window -- we'll need that below    if ( !wxWindow::Show(show) )        return false;    // If this is the first time Show was called, send size event,    // so that the frame can adjust itself (think auto layout or single child)    if ( !m_sizeSet )    {        m_sizeSet = true;        wxSizeEvent event(GetSize(), GetId());        event.SetEventObject(this);        HandleWindowEvent(event);    }    // make sure the window is fully painted, with all pending updates, before    // DFB WM shows it, otherwise it would attempt to show either empty (=    // black) window surface (if shown for the first time) or it would show    // window with outdated content; note that the window was already refreshed    // in the wxWindow::Show() call above:    if ( show )        Update();    // hide/show the window by setting its opacity to 0/full:    m_dfbwin->SetOpacity(show ? m_opacity : 0);    if ( show )    {        wxWindow *focused = FindFocus();        if ( focused && focused->GetTLW() == this )        {            // focus is on this frame or its children, apply it to DirectFB            SetDfbFocus();        }        // else: don't do anything, if this is wxFrame or wxDialog that should        //       get focus when it's shown,        //       wxTopLevelWindowDFB::HandleFocusEvent() will do it as soon as        //       the event loop starts    }    return true;}

void TimeEdit::PasteTime() {    if (byFrame) {        Paste();        return;    }    std::string text(GetClipboard());    if (text.empty()) return;    AssTime tempTime(text);    if (tempTime.GetAssFormated() == text) {        SetTime(tempTime);        SetSelection(0, GetValue().size());        wxCommandEvent evt(wxEVT_TEXT, GetId());        evt.SetEventObject(this);        HandleWindowEvent(evt);    }}

void wxGLCanvas::OnInternalIdle(){    if (m_exposed)    {#ifdef __WXGTK3__        GTKSendPaintEvents(m_cairoPaintContext);        cairo_destroy(m_cairoPaintContext);        m_cairoPaintContext = NULL;#else        wxPaintEvent event( GetId() );        event.SetEventObject( this );        HandleWindowEvent( event );#endif        m_exposed = false;        GetUpdateRegion().Clear();    }    wxWindow::OnInternalIdle();}

bool wxPopupWindow::Show(bool show){    if ( !wxWindow::Show(show) )        return false;    if ( m_nowpeer && show)        m_nowpeer->ShowWithoutActivating();    else if ( m_nowpeer )        m_nowpeer->Show(false);    if ( show )    {        // because apps expect a size event to occur at this moment        wxSizeEvent event(GetSize() , m_windowId);        event.SetEventObject(this);        HandleWindowEvent(event);    }    return true;}