containr.cpp

来自「A*算法 A*算法 A*算法 A*算法A*算法A*算法」· C++ 代码 · 共 658 行 · 第 1/2 页

        // the event emitter might have done this for us
        wxWindow *winFocus = event.GetCurrentFocus();

        // but if not, we might know where the focus was ourselves
        if (!winFocus)
            winFocus = m_winLastFocused;

        // if still no luck, do it the hard way
        if (!winFocus)
            winFocus = wxWindow::FindFocus();

        if ( winFocus )
        {
#ifdef __WXMSW__
            // If we are in a radio button group, start from the first item in the
            // group
            if ( event.IsFromTab() && wxIsKindOf(winFocus, wxRadioButton ) )
                winFocus = wxGetFirstButtonInGroup((wxRadioButton*)winFocus);
#endif
            // ok, we found the focus - now is it our child?
            start_node = children.Find( winFocus );
        }
        else
        {
            start_node = wxWindowList::compatibility_iterator();
        }

        if ( !start_node && m_winLastFocused )
        {
            // window which has focus isn't our child, fall back to the one
            // which had the focus the last time
            start_node = children.Find( m_winLastFocused );
        }

        // if we still didn't find anything, we should start with the first one
        if ( !start_node )
        {
            start_node = children.GetFirst();
        }

        // and the first child which we can try setting focus to is the next or
        // the previous one
        node = forward ? start_node->GetNext() : start_node->GetPrevious();
    }

    // we want to cycle over all elements passing by NULL
    for( ;; )
    {
        // if it is the starting node then break
        if( node && start_node && node == start_node )
            break;

        // Have we come to the last or first item on the panel?
        if ( !node )
        {
            if ( !start_node )
            {
                // exit now as otherwise we'd loop forever
                break;
            }

            if ( !goingDown )
            {
                // Check if our (may be grand) parent is another panel: if this
                // is the case, they will know what to do with this navigation
                // key and so give them the chance to process it instead of
                // looping inside this panel (normally, the focus will go to
                // the next/previous item after this panel in the parent
                // panel).
                wxWindow *focussed_child_of_parent = m_winParent;
                while ( parent )
                {
                    // we don't want to tab into a different dialog or frame
                    if ( focussed_child_of_parent->IsTopLevel() )
                        break;

                    event.SetCurrentFocus( focussed_child_of_parent );
                    if ( parent->GetEventHandler()->ProcessEvent( event ) )
                        return;

                    focussed_child_of_parent = parent;

                    parent = parent->GetParent();
                }
            }
            //else: as the focus came from our parent, we definitely don't want
            //      to send it back to it!

            // no, we are not inside another panel so process this ourself
            node = forward ? children.GetFirst() : children.GetLast();

            continue;
        }

        wxWindow *child = node->GetData();

#ifdef __WXMSW__
        if ( event.IsFromTab() )
        {
            if ( wxIsKindOf(child, wxRadioButton) )
            {
                // only radio buttons with either wxRB_GROUP or wxRB_SINGLE
                // can be tabbed to
                if ( child->HasFlag(wxRB_GROUP) )
                {
                    // need to tab into the active button within a group
                    wxRadioButton *rb = wxGetSelectedButtonInGroup((wxRadioButton*)child);
                    if ( rb )
                        child = rb;
                }
                else if ( !child->HasFlag(wxRB_SINGLE) )
                {
                    node = forward ? node->GetNext() : node->GetPrevious();
                    continue;
                }
            }
        }
        else if ( m_winLastFocused &&
                  wxIsKindOf(m_winLastFocused, wxRadioButton) &&
                  !m_winLastFocused->HasFlag(wxRB_SINGLE) )
        {
            // cursor keys don't navigate out of a radio button group so
            // find the correct radio button to focus
            if ( forward )
            {
                child = wxGetNextButtonInGroup((wxRadioButton*)m_winLastFocused);
                if ( !child )
                {
                    // no next button in group, set it to the first button
                    child = wxGetFirstButtonInGroup((wxRadioButton*)m_winLastFocused);
                }
            }
            else
            {
                child = wxGetPreviousButtonInGroup((wxRadioButton*)m_winLastFocused);
                if ( !child )
                {
                    // no previous button in group, set it to the last button
                    child = wxGetLastButtonInGroup((wxRadioButton*)m_winLastFocused);
                }
            }

            if ( child == m_winLastFocused )
            {
                // must be a group consisting of only one button therefore
                // no need to send a navigation event
                event.Skip(false);
                return;
            }
        }
#endif // __WXMSW__

        if ( child->AcceptsFocusFromKeyboard() )
        {
            // if we're setting the focus to a child panel we should prevent it
            // from giving it to the child which had the focus the last time
            // and instead give it to the first/last child depending from which
            // direction we're coming
            event.SetEventObject(m_winParent);

            // disable propagation for this call as otherwise the event might
            // bounce back to us.
            wxPropagationDisabler disableProp(event);
            if ( !child->GetEventHandler()->ProcessEvent(event) )
            {
                // set it first in case SetFocusFromKbd() results in focus
                // change too
                m_winLastFocused = child;

                // everything is simple: just give focus to it
                child->SetFocusFromKbd();
            }
            //else: the child manages its focus itself

            event.Skip( false );

            return;
        }

        node = forward ? node->GetNext() : node->GetPrevious();
    }

    // we cycled through all of our children and none of them wanted to accept
    // focus
    event.Skip();
}

void wxControlContainer::HandleOnWindowDestroy(wxWindowBase *child)
{
    if ( child == m_winLastFocused )
        m_winLastFocused = NULL;

    if ( child == m_winDefault )
        m_winDefault = NULL;

    if ( child == m_winTmpDefault )
        m_winTmpDefault = NULL;
}

// ----------------------------------------------------------------------------
// focus handling
// ----------------------------------------------------------------------------

bool wxControlContainer::DoSetFocus()
{
    wxLogTrace(_T("focus"), _T("SetFocus on wxPanel 0x%08lx."),
               (unsigned long)m_winParent->GetHandle());

    if (m_inSetFocus)
        return true;

    // when the panel gets the focus we move the focus to either the last
    // window that had the focus or the first one that can get it unless the
    // focus had been already set to some other child

    wxWindow *win = wxWindow::FindFocus();
    while ( win )
    {
        if ( win == m_winParent )
        {
            // our child already has focus, don't take it away from it
            return true;
        }

        if ( win->IsTopLevel() )
        {
            // don't look beyond the first top level parent - useless and
            // unnecessary
            break;
        }

        win = win->GetParent();
    }

    // protect against infinite recursion:
    m_inSetFocus = true;

    bool ret = SetFocusToChild();

    m_inSetFocus = false;

    return ret;
}

void wxControlContainer::HandleOnFocus(wxFocusEvent& event)
{
    wxLogTrace(_T("focus"), _T("OnFocus on wxPanel 0x%08lx, name: %s"),
               (unsigned long)m_winParent->GetHandle(),
               m_winParent->GetName().c_str() );

    DoSetFocus();

    event.Skip();
}

bool wxControlContainer::SetFocusToChild()
{
    return wxSetFocusToChild(m_winParent, &m_winLastFocused);
}

// ----------------------------------------------------------------------------
// SetFocusToChild(): this function is used by wxPanel but also by wxFrame in
// wxMSW, this is why it is outside of wxControlContainer class
// ----------------------------------------------------------------------------

bool wxSetFocusToChild(wxWindow *win, wxWindow **childLastFocused)
{
    wxCHECK_MSG( win, false, _T("wxSetFocusToChild(): invalid window") );
    wxCHECK_MSG( childLastFocused, false,
                 _T("wxSetFocusToChild(): NULL child poonter") );

    if ( *childLastFocused )
    {
        // It might happen that the window got reparented
        if ( (*childLastFocused)->GetParent() == win )
        {
            wxLogTrace(_T("focus"),
                       _T("SetFocusToChild() => last child (0x%08lx)."),
                       (unsigned long)(*childLastFocused)->GetHandle());

            // not SetFocusFromKbd(): we're restoring focus back to the old
            // window and not setting it as the result of a kbd action
            (*childLastFocused)->SetFocus();
            return true;
        }
        else
        {
            // it doesn't count as such any more
            *childLastFocused = (wxWindow *)NULL;
        }
    }

    // set the focus to the first child who wants it
    wxWindowList::compatibility_iterator node = win->GetChildren().GetFirst();
    while ( node )
    {
        wxWindow *child = node->GetData();

        if ( child->AcceptsFocusFromKeyboard() && !child->IsTopLevel() )
        {
#ifdef __WXMSW__
            // If a radiobutton is the first focusable child, search for the
            // selected radiobutton in the same group
            wxRadioButton* btn = wxDynamicCast(child, wxRadioButton);
            if (btn)
            {
                wxRadioButton* selected = wxGetSelectedButtonInGroup(btn);
                if (selected)
                    child = selected;
            }
#endif

            wxLogTrace(_T("focus"),
                       _T("SetFocusToChild() => first child (0x%08lx)."),
                       (unsigned long)child->GetHandle());

            *childLastFocused = child;
            child->SetFocusFromKbd();
            return true;
        }

        node = node->GetNext();
    }

    return false;
}