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/** \file
* \brief Keyboard Focus navigation
*
* See Copyright Notice in "iup.h"
*/
#include <stdio.h>
#include "iup.h"
#include "iupcbs.h"
#include "iup_object.h"
#include "iup_focus.h"
#include "iup_class.h"
#include "iup_assert.h"
#include "iup_attrib.h"
#include "iup_str.h"
#include "iup_drv.h"
Ihandle* iupFocusNextInteractive(Ihandle *ih)
{
Ihandle *c;
if (!ih)
return NULL;
for (c = ih->brother; c; c = c->brother)
{
if (c->iclass->is_interactive)
return c;
}
return NULL;
}
int iupFocusCanAccept(Ihandle *ih)
{
if (ih->iclass->is_interactive && /* interactive */
iupAttribGetBoolean(ih, "CANFOCUS") && /* can receive focus */
ih->handle && /* mapped */
IupGetInt(ih, "ACTIVE") && /* active */
IupGetInt(ih, "VISIBLE")) /* visible */
return 1;
else
return 0;
}
static int iFocusCheckActiveRadio(Ihandle *ih)
{
if (iupStrEqual(ih->iclass->name, "toggle") &&
IupGetInt(ih, "RADIO") &&
!IupGetInt(ih, "VALUE"))
return 0;
else
return 1;
}
static Ihandle* iFocusFindAtBrothers(Ihandle *start, int checkradio)
{
Ihandle *c;
Ihandle *nf;
for (c = start; c; c = c->brother)
{
/* check itself */
if (iupFocusCanAccept(c) && (!checkradio || iFocusCheckActiveRadio(c)))
return c;
/* then check its children */
nf = iFocusFindAtBrothers(c->firstchild, checkradio);
if (nf)
return nf;
}
return NULL;
}
static Ihandle* iFocusFindNext(Ihandle *ih, int checkradio)
{
Ihandle *nf, *p;
if (!ih)
return NULL;
/* look down in the child tree */
if (ih->firstchild)
{
nf = iFocusFindAtBrothers(ih->firstchild, checkradio);
if (nf) return nf;
}
/* look in the same level */
if (ih->brother)
{
nf = iFocusFindAtBrothers(ih->brother, checkradio);
if (nf) return nf;
}
/* look up in the brothers of the parent level */
if (ih->parent)
{
for (p = ih->parent; p; p = p->parent)
{
if (p->brother)
{
nf = iFocusFindAtBrothers(p->brother, checkradio);
if (nf) return nf;
}
}
}
return NULL;
}
Ihandle* IupNextField(Ihandle *ih)
{
Ihandle *ih_next;
iupASSERT(iupObjectCheck(ih));
if (!iupObjectCheck(ih))
return NULL;
ih_next = iFocusFindNext(ih, 1);
if (!ih_next)
{
/* not found after the element, then start over from the begining,
at the dialog. */
ih_next = iFocusFindNext(IupGetDialog(ih), 1);
if (ih_next == ih)
return NULL;
}
if (ih_next)
{
iupdrvSetFocus(ih_next);
return ih_next;
}
return NULL;
}
void iupFocusNext(Ihandle *ih)
{
Ihandle *ih_next = iFocusFindNext(ih, 0);
if (!ih_next)
{
/* not found after the element, then start over from the begining,
at the dialog. */
ih_next = iFocusFindNext(IupGetDialog(ih), 0);
if (ih_next == ih)
return;
}
if (ih_next)
iupdrvSetFocus(ih_next);
}
static int iFocusFindPrevious(Ihandle *parent, Ihandle **previous, Ihandle *ih, int checkradio)
{
Ihandle *c;
if (!parent)
return 0;
for (c = parent->firstchild; c; c = c->brother)
{
if (c == ih)
{
/* if found child, returns the current previous.
but if previous is NULL, then keep searching until the last element. */
if (*previous)
return 1;
}
else
{
/* save the possible previous */
if (iupFocusCanAccept(c) && (!checkradio || iFocusCheckActiveRadio(c)))
*previous = c;
}
/* then check its children */
if (iFocusFindPrevious(c, previous, ih, checkradio))
return 1;
}
return 0;
}
Ihandle* IupPreviousField(Ihandle *ih)
{
Ihandle *previous = NULL;
iupASSERT(iupObjectCheck(ih));
if (!iupObjectCheck(ih))
return NULL;
/* search from the dialog down to the element */
iFocusFindPrevious(IupGetDialog(ih), &previous, ih, 1);
if (previous)
{
iupdrvSetFocus(previous);
return previous;
}
return NULL;
}
void iupFocusPrevious(Ihandle *ih)
{
Ihandle *previous = NULL;
/* search from the dialog down to the element */
iFocusFindPrevious(IupGetDialog(ih), &previous, ih, 0);
if (previous)
iupdrvSetFocus(previous);
}
/* local variables */
static Ihandle* iup_current_focus = NULL;
Ihandle* IupGetFocus(void)
{
return iup_current_focus;
}
void iupSetCurrentFocus(Ihandle *ih)
{
iup_current_focus = ih;
}
Ihandle *IupSetFocus(Ihandle *ih)
{
Ihandle* old_focus = IupGetFocus();
iupASSERT(iupObjectCheck(ih));
if (!iupObjectCheck(ih))
return old_focus;
/* Current focus is NOT set here,
only in the iupCallGetFocusCb */
if (iupFocusCanAccept(ih))
iupdrvSetFocus(ih);
return old_focus;
}
void iupCallGetFocusCb(Ihandle *ih)
{
Icallback cb;
if (ih == IupGetFocus()) /* avoid duplicate messages */
return;
cb = (Icallback)IupGetCallback(ih, "GETFOCUS_CB");
if (cb) cb(ih);
if (ih->iclass->nativetype == IUP_TYPECANVAS)
{
IFni cb2 = (IFni)IupGetCallback(ih, "FOCUS_CB");
if (cb2) cb2(ih, 1);
}
iupSetCurrentFocus(ih);
}
void iupCallKillFocusCb(Ihandle *ih)
{
Icallback cb;
if (ih != IupGetFocus()) /* avoid duplicate messages */
return;
cb = IupGetCallback(ih, "KILLFOCUS_CB");
if (cb) cb(ih);
if (ih->iclass->nativetype == IUP_TYPECANVAS)
{
IFni cb2 = (IFni)IupGetCallback(ih, "FOCUS_CB");
if (cb2) cb2(ih, 0);
}
iupSetCurrentFocus(NULL);
}
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