containr.cpp

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///////////////////////////////////////////////////////////////////////////////
// Name:        src/common/containr.cpp
// Purpose:     implementation of wxControlContainer
// Author:      Vadim Zeitlin
// Modified by:
// Created:     06.08.01
// RCS-ID:      $Id: containr.cpp,v 1.37.2.2 2006/03/25 02:56:53 VZ Exp $
// Copyright:   (c) 2001 Vadim Zeitlin <[e-mail]>
// License:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

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

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

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

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

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/log.h"
    #include "wx/event.h"
    #include "wx/window.h"
#endif //WX_PRECOMP

#include "wx/containr.h"

#ifdef __WXMAC__
    #include "wx/scrolbar.h"
#endif

#ifdef __WXMSW__
    #include "wx/radiobut.h"
#endif

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

wxControlContainer::wxControlContainer(wxWindow *winParent)
{
    m_winParent = winParent;

    m_winLastFocused =
    m_winTmpDefault =
    m_winDefault = NULL;
    m_inSetFocus = false;
}

bool wxControlContainer::AcceptsFocus() const
{
    // if we're not shown or disabled, we can't accept focus
    if ( m_winParent->IsShown() && m_winParent->IsEnabled() )
    {
        // otherwise we can accept focus either if we have no children at all
        // (in this case we're probably not used as a container) or only when
        // at least one child will accept focus
        wxWindowList::compatibility_iterator node = m_winParent->GetChildren().GetFirst();
        if ( !node )
            return true;

#ifdef __WXMAC__
        // wxMac has eventually the two scrollbars as children, they don't count
        // as real children in the algorithm mentioned above
        bool hasRealChildren = false ;
#endif

        while ( node )
        {
            wxWindow *child = node->GetData();

            if ( child->AcceptsFocus() )
            {
                return true;
            }

#ifdef __WXMAC__
            wxScrollBar *sb = wxDynamicCast( child , wxScrollBar ) ;
            if ( sb == NULL || !m_winParent->MacIsWindowScrollbar( sb ) )
                hasRealChildren = true ;
#endif
            node = node->GetNext();
        }

#ifdef __WXMAC__
        if ( !hasRealChildren )
            return true ;
#endif
    }

    return false;
}

void wxControlContainer::SetLastFocus(wxWindow *win)
{
    // the panel itself should never get the focus at all but if it does happen
    // temporarily (as it seems to do under wxGTK), at the very least don't
    // forget our previous m_winLastFocused
    if ( win != m_winParent )
    {
        // if we're setting the focus
        if ( win )
        {
            // find the last _immediate_ child which got focus
            wxWindow *winParent = win;
            while ( winParent != m_winParent )
            {
                win = winParent;
                winParent = win->GetParent();

                // Yes, this can happen, though in a totally pathological case.
                // like when detaching a menubar from a frame with a child
                // which has pushed itself as an event handler for the menubar.
                // (under wxGTK)

                wxASSERT_MSG( winParent,
                              _T("Setting last focus for a window that is not our child?") );
            }
        }

        m_winLastFocused = win;

        if ( win )
        {
            wxLogTrace(_T("focus"), _T("Set last focus to %s(%s)"),
                       win->GetClassInfo()->GetClassName(),
                       win->GetLabel().c_str());
        }
        else
        {
            wxLogTrace(_T("focus"), _T("No more last focus"));
        }
    }

    // propagate the last focus upwards so that our parent can set focus back
    // to us if it loses it now and regains later
    wxWindow *parent = m_winParent->GetParent();
    if ( parent )
    {
        wxChildFocusEvent eventFocus(m_winParent);
        parent->GetEventHandler()->ProcessEvent(eventFocus);
    }
}

// --------------------------------------------------------------------
// The following four functions are used to find other radio buttons
// within the same group. Used by wxSetFocusToChild on wxMSW
// --------------------------------------------------------------------

#ifdef __WXMSW__

wxRadioButton* wxGetPreviousButtonInGroup(wxRadioButton *btn)
{
    if ( btn->HasFlag(wxRB_GROUP) || btn->HasFlag(wxRB_SINGLE) )
        return NULL;

    const wxWindowList& siblings = btn->GetParent()->GetChildren();
    wxWindowList::compatibility_iterator nodeThis = siblings.Find(btn);
    wxCHECK_MSG( nodeThis, NULL, _T("radio button not a child of its parent?") );

    // Iterate over all previous siblings until we find the next radio button
    wxWindowList::compatibility_iterator nodeBefore = nodeThis->GetPrevious();
    wxRadioButton *prevBtn = 0;
    while (nodeBefore)
    {
        prevBtn = wxDynamicCast(nodeBefore->GetData(), wxRadioButton);
        if (prevBtn)
            break;

        nodeBefore = nodeBefore->GetPrevious();
    }

    if (!prevBtn || prevBtn->HasFlag(wxRB_SINGLE))
    {
        // no more buttons in group
        return NULL;
    }

    return prevBtn;
}

wxRadioButton* wxGetNextButtonInGroup(wxRadioButton *btn)
{
    if (btn->HasFlag(wxRB_SINGLE))
        return NULL;

    const wxWindowList& siblings = btn->GetParent()->GetChildren();
    wxWindowList::compatibility_iterator nodeThis = siblings.Find(btn);
    wxCHECK_MSG( nodeThis, NULL, _T("radio button not a child of its parent?") );

    // Iterate over all previous siblings until we find the next radio button
    wxWindowList::compatibility_iterator nodeNext = nodeThis->GetNext();
    wxRadioButton *nextBtn = 0;
    while (nodeNext)
    {
        nextBtn = wxDynamicCast(nodeNext->GetData(), wxRadioButton);
        if (nextBtn)
            break;

        nodeNext = nodeNext->GetNext();
    }

    if ( !nextBtn || nextBtn->HasFlag(wxRB_GROUP) || nextBtn->HasFlag(wxRB_SINGLE) )
    {
        // no more buttons or the first button of the next group
        return NULL;
    }

    return nextBtn;
}

wxRadioButton* wxGetFirstButtonInGroup(wxRadioButton *btn)
{
    while (true)
    {
        wxRadioButton* prevBtn = wxGetPreviousButtonInGroup(btn);
        if (!prevBtn)
            return btn;

        btn = prevBtn;
    }
}

wxRadioButton* wxGetLastButtonInGroup(wxRadioButton *btn)
{
    while (true)
    {
        wxRadioButton* nextBtn = wxGetNextButtonInGroup(btn);
        if (!nextBtn)
            return btn;

        btn = nextBtn;
    }
}

wxRadioButton* wxGetSelectedButtonInGroup(wxRadioButton *btn)
{
    // Find currently selected button
    if (btn->GetValue())
        return btn;

    if (btn->HasFlag(wxRB_SINGLE))
        return NULL;

    wxRadioButton *selBtn;

    // First check all previous buttons
    for (selBtn = wxGetPreviousButtonInGroup(btn); selBtn; selBtn = wxGetPreviousButtonInGroup(selBtn))
        if (selBtn->GetValue())
            return selBtn;

    // Now all following buttons
    for (selBtn = wxGetNextButtonInGroup(btn); selBtn; selBtn = wxGetNextButtonInGroup(selBtn))
        if (selBtn->GetValue())
            return selBtn;

    return NULL;
}

#endif // __WXMSW__

// ----------------------------------------------------------------------------
// Keyboard handling - this is the place where the TAB traversal logic is
// implemented. As this code is common to all ports, this ensures consistent
// behaviour even if we don't specify how exactly the wxNavigationKeyEvent are
// generated and this is done in platform specific code which also ensures that
// we can follow the given platform standards.
// ----------------------------------------------------------------------------

void wxControlContainer::HandleOnNavigationKey( wxNavigationKeyEvent& event )
{
    wxWindow *parent = m_winParent->GetParent();

    // the event is propagated downwards if the event emitter was our parent
    bool goingDown = event.GetEventObject() == parent;

    const wxWindowList& children = m_winParent->GetChildren();

    // there is not much to do if we don't have children and we're not
    // interested in "notebook page change" events here
    if ( !children.GetCount() || event.IsWindowChange() )
    {
        // let the parent process it unless it already comes from our parent
        // of we don't have any
        if ( goingDown ||
             !parent || !parent->GetEventHandler()->ProcessEvent(event) )
        {
            event.Skip();
        }

        return;
    }

    // where are we going?
    bool forward = event.GetDirection();

    // the node of the children list from which we should start looking for the
    // next acceptable child
    wxWindowList::compatibility_iterator node, start_node;

    // we should start from the first/last control and not from the one which
    // had focus the last time if we're propagating the event downwards because
    // for our parent we look like a single control
    if ( goingDown )
    {
        // just to be sure it's not used (normally this is not necessary, but
        // doesn't hurt neither)
        m_winLastFocused = (wxWindow *)NULL;

        // start from first or last depending on where we're going
        node = forward ? children.GetFirst() : children.GetLast();

        // we want to cycle over all nodes
        start_node = wxWindowList::compatibility_iterator();
    }
    else
    {
        // try to find the child which has the focus currently