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wxWindows-2.4.0
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common
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containr.cpp
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2002-11-04
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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 1.14.2.2 2002/10/29 00:34:15 VZ Exp $
// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// License: wxWindows license
///////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#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"
// ============================================================================
// implementation
// ============================================================================
wxControlContainer::wxControlContainer(wxWindow *winParent)
{
m_winParent = winParent;
m_winLastFocused =
m_winTmpDefault =
m_winDefault = NULL;
}
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);
}
}
// ----------------------------------------------------------------------------
// 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::Node *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::Node *)NULL;
}
else
{
// try to find the child which has the focus currently
// 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 )
{
// ok, we found the focus - now is it our child?
start_node = children.Find( winFocus );
}
else
{
start_node = (wxWindowList::Node *)NULL;
}
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
while ( node != start_node )
{
// Have we come to the last or first item on the panel?
if ( !node )
{
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();
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);
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());
// 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();
}
return SetFocusToChild();
}
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::Node *node = win->GetChildren().GetFirst();
while ( node )
{
wxWindow *child = node->GetData();
if ( child->AcceptsFocusFromKeyboard() && !child->IsTopLevel() )
{
wxLogTrace(_T("focus"),
_T("SetFocusToChild() => first child (0x%08lx)."),
(unsigned long)child->GetHandle());
*childLastFocused = child; // should be redundant, but it is not
child->SetFocusFromKbd();
return TRUE;
}
node = node->GetNext();
}
return FALSE;
}