taskbar.cpp

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

    // NB:  Here we have to perform a deep copy of the menu,
    // copying each and every menu item from menu to m_pMenu.
    // Other implementations use wxWindow::PopupMenu here,
    // which idle execution until the user selects something,
    // but since the Mac handles this internally, we can't -
    // and have no way at all to idle it while the dock menu
    // is being shown before menu goes out of scope (it may
    // not be on the heap, and may expire right after this function
    // is done - we need it to last until the carbon event is triggered -
    // that's when the user right clicks).
    //
    // Also, since there is no equal (assignment) operator
    // on either wxMenu or wxMenuItem, we have to do all the
    // dirty work ourselves.

    // perform a deep copy of the menu
    wxMenuItemList& theList = menu->GetMenuItems();
    wxMenuItemList::compatibility_iterator theNode = theList.GetFirst();

    // create the main menu
    wxMenu *m_pMenu = new wxMenu(menu->GetTitle());

    while (theNode != NULL)
    {
        wxMenuItem* theItem = theNode->GetData();
        m_pMenu->Append(
            new wxMenuItem(
                m_pMenu, // parent menu
                theItem->GetId(), // id
                theItem->GetText(), // text label
                theItem->GetHelp(), // status bar help string
                theItem->GetKind(), // menu flags - checkable, separator, etc.
                wxDeepCopyMenu(theItem->GetSubMenu()) )); // submenu

        theNode = theNode->GetNext();
    }

    return m_pMenu;
}

//-----------------------------------------------------------------------------
// wxDockTaskBarIcon ctor
//
// Initializes the dock implementation of wxTaskBarIcon.
//
// Here we create some Mac-specific event handlers and UPPs.
//-----------------------------------------------------------------------------
wxDockTaskBarIcon::wxDockTaskBarIcon(wxTaskBarIcon* parent)
    :   wxTaskBarIconImpl(parent),
        m_eventHandlerRef(NULL), m_pMenu(NULL),
        m_theLastMenu(GetApplicationDockTileMenu()), m_iconAdded(false)
{
    // register the events that will return the dock menu
    EventTypeSpec tbEventList[] =
    {
        { kEventClassCommand, kEventProcessCommand },
        { kEventClassApplication, kEventAppGetDockTileMenu }
    };

    m_eventupp = NewEventHandlerUPP(wxDockEventHandler);
    wxASSERT(m_eventupp != NULL);

    OSStatus err = InstallApplicationEventHandler(
            m_eventupp,
            GetEventTypeCount(tbEventList), tbEventList,
            this, &m_eventHandlerRef);
    verify_noerr( err );
}

//-----------------------------------------------------------------------------
// wxDockTaskBarIcon Destructor
//
// Cleans up mac events and restores the old icon to the dock
//-----------------------------------------------------------------------------
wxDockTaskBarIcon::~wxDockTaskBarIcon()
{
    // clean up event handler and event UPP
    RemoveEventHandler(m_eventHandlerRef);
    DisposeEventHandlerUPP(m_eventupp);

    // restore old icon and menu to the dock
    RemoveIcon();
}

//-----------------------------------------------------------------------------
// wxDockTaskBarIcon::DoCreatePopupMenu
//
// Helper function that handles a request from the dock event handler
// to get the menu for the dock
//-----------------------------------------------------------------------------
wxMenu * wxDockTaskBarIcon::DoCreatePopupMenu()
{
    // get the menu from the parent
    wxMenu* theNewMenu = CreatePopupMenu();

    if (theNewMenu)
    {
        if (m_pMenu)
            delete m_pMenu;
        m_pMenu = theNewMenu;
        m_pMenu->SetInvokingWindow(m_menuEventWindow);
    }

    // the return here can be one of three things
    // (in order of priority):
    // 1) User passed a menu from CreatePopupMenu override
    // 2) menu sent to and copied from PopupMenu
    // 3) If neither (1) or (2), then NULL
    //
    return m_pMenu;
}

//-----------------------------------------------------------------------------
// wxDockTaskBarIcon::IsIconInstalled
//
// Returns whether or not the dock is not using the default image
//-----------------------------------------------------------------------------
bool wxDockTaskBarIcon::IsIconInstalled() const
{
    return m_iconAdded;
}

//-----------------------------------------------------------------------------
// wxDockTaskBarIcon::SetIcon
//
// Sets the icon for the dock CGImage functions and SetApplicationDockTileImage
//-----------------------------------------------------------------------------
bool wxDockTaskBarIcon::SetIcon(const wxIcon& icon, const wxString& tooltip)
{
    // convert the wxIcon into a wxBitmap so we can perform some
    // wxBitmap operations with it
    wxBitmap bmp( icon );
    wxASSERT( bmp.Ok() );

    // get the CGImageRef for the wxBitmap:
    // OSX builds only, but then the dock only exists in OSX
    CGImageRef pImage = (CGImageRef) bmp.CGImageCreate();
    wxASSERT( pImage != NULL );

    // actually set the dock image
    OSStatus err = SetApplicationDockTileImage( pImage );
    verify_noerr( err );

    // free the CGImage, now that it's referenced by the dock
    if (pImage != NULL)
        CGImageRelease( pImage );

    bool success = (err == noErr);
    m_iconAdded = success;

    return success;
}

//-----------------------------------------------------------------------------
// wxDockTaskBarIcon::RemoveIcon
//
// Restores the old image for the dock via RestoreApplicationDockTileImage
//-----------------------------------------------------------------------------
bool wxDockTaskBarIcon::RemoveIcon()
{
    if (m_pMenu)
    {
        delete m_pMenu;
        m_pMenu = NULL;
    }

    // restore old icon to the dock
    OSStatus err = RestoreApplicationDockTileImage();
    verify_noerr( err );

    // restore the old menu to the dock
    SetApplicationDockTileMenu( m_theLastMenu );

    bool success = (err == noErr);
    m_iconAdded = !success;

    return success;
}

//-----------------------------------------------------------------------------
// wxDockTaskBarIcon::PopupMenu
//
// 2.4 and wxPython method that "pops of the menu in the taskbar".
//
// In reality because of the way the dock menu works in carbon
// we just save the menu, and if the user didn't override CreatePopupMenu
// return the menu passed here, thus sort of getting the same effect.
//-----------------------------------------------------------------------------
bool wxDockTaskBarIcon::PopupMenu(wxMenu *menu)
{
    wxASSERT(menu != NULL);

    if (m_pMenu)
        delete m_pMenu;

    // start copy of menu
    m_pMenu = wxDeepCopyMenu(menu);

    // finish up
    m_pMenu->SetInvokingWindow(m_menuEventWindow);

    return true;
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
//  wxTaskBarIcon
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

IMPLEMENT_DYNAMIC_CLASS(wxTaskBarIcon, wxEvtHandler)

//-----------------------------------------------------------------------------
// wxTaskBarIcon Constructor
//
// Creates the backend
//
// Note that we only support DOCK currently as others require cocoa and
// also some require hacks and other such things. (MenuExtras are
// actually seperate programs that also require a special undocumented id
// hack and other such fun stuff).
//-----------------------------------------------------------------------------
wxTaskBarIcon::wxTaskBarIcon(wxTaskBarIconType nType)
{
    wxASSERT_MSG(
        nType == DOCK,
        wxT("Only the DOCK implementation of wxTaskBarIcon on Mac-Carbon is currently supported!") );

    m_impl = new wxDockTaskBarIcon(this);
}

//-----------------------------------------------------------------------------
// wxTaskBarIcon Destructor
//
// Destroys the backend
//-----------------------------------------------------------------------------
wxTaskBarIcon::~wxTaskBarIcon()
{
    delete m_impl;
}

//-----------------------------------------------------------------------------
// wxTaskBarIcon::SetIcon
// wxTaskBarIcon::RemoveIcon
// wxTaskBarIcon::PopupMenu
//
// Just calls the backend version of the said function.
//-----------------------------------------------------------------------------
bool wxTaskBarIcon::IsIconInstalled() const
{ return m_impl->IsIconInstalled(); }

bool wxTaskBarIcon::SetIcon(const wxIcon& icon, const wxString& tooltip)
{ return m_impl->SetIcon(icon, tooltip); }

bool wxTaskBarIcon::RemoveIcon()
{ return m_impl->RemoveIcon(); }

bool wxTaskBarIcon::PopupMenu(wxMenu *menu)
{ return m_impl->PopupMenu(menu); }

#endif // wxHAS_TASK_BAR_ICON