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/*
* tkMacOSXCarbonEvents.c --
*
* This file implements functions that register for and handle
* various Carbon Events. The reason a separate set of handlers
* is necessary is that not all interesting events get delivered
* directly to the event queue through ReceiveNextEvent. Some only
* get delivered if you register a Carbon Event Handler for the event.
*
* Copyright 2001, Apple Computer, Inc.
*
* The following terms apply to all files originating from Apple
* Computer, Inc. ("Apple") and associated with the software
* unless explicitly disclaimed in individual files.
*
*
* Apple hereby grants permission to use, copy, modify,
* distribute, and license this software and its documentation
* for any purpose, provided that existing copyright notices are
* retained in all copies and that this notice is included
* verbatim in any distributions. No written agreement, license,
* or royalty fee is required for any of the authorized
* uses. Modifications to this software may be copyrighted by
* their authors and need not follow the licensing terms
* described here, provided that the new terms are clearly
* indicated on the first page of each file where they apply.
*
*
* IN NO EVENT SHALL APPLE, THE AUTHORS OR DISTRIBUTORS OF THE
* SOFTWARE BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL,
* INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
* THIS SOFTWARE, ITS DOCUMENTATION, OR ANY DERIVATIVES THEREOF,
* EVEN IF APPLE OR THE AUTHORS HAVE BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. APPLE, THE AUTHORS AND
* DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS
* SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND APPLE,THE
* AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* GOVERNMENT USE: If you are acquiring this software on behalf
* of the U.S. government, the Government shall have only
* "Restricted Rights" in the software and related documentation
* as defined in the Federal Acquisition Regulations (FARs) in
* Clause 52.227.19 (c) (2). If you are acquiring the software
* on behalf of the Department of Defense, the software shall be
* classified as "Commercial Computer Software" and the
* Government shall have only "Restricted Rights" as defined in
* Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
* foregoing, the authors grant the U.S. Government and others
* acting in its behalf permission to use and distribute the
* software in accordance with the terms specified in this
* license.
*/
#include "tkInt.h"
#include "tkMacOSXInt.h"
static EventHandlerRef ApplicationCarbonEventHandler;
/* Definitions of functions used only in this file */
static OSStatus AppEventHandlerProc (
EventHandlerCallRef callRef,
EventRef inEvent,
void *userData);
/*
*----------------------------------------------------------------------
*
* AppEventHandlerProc --
*
* This procedure is the Application CarbonEvent
* handler. Currently, it handles the Hide & Show
* events.
*
* Results:
* None.
*
* Side effects:
* Dispatches CarbonEvents.
*
*----------------------------------------------------------------------
*/
static OSStatus
AppEventHandlerProc (
EventHandlerCallRef callRef,
EventRef inEvent,
void *inUserData)
{
Tcl_CmdInfo dummy;
Tcl_Interp *interp = (Tcl_Interp *) inUserData;
/*
* This is a bit of a hack. We get "show" events both when we come back
* from being hidden, and whenever we are activated. I only want to run the
* "show" proc when we have been hidden already, not as a substitute for
* <Activate>. So I use this toggle...
*/
static int toggleHide = 0;
switch(GetEventKind (inEvent))
{
case kEventAppHidden:
/*
* Don't bother if we don't have an interp or
* the show preferences procedure doesn't exist.
*/
toggleHide = 1;
if ((interp == NULL) ||
(Tcl_GetCommandInfo(interp,
"::tk::mac::OnHide", &dummy)) == 0) {
return eventNotHandledErr;
}
Tcl_GlobalEval(interp, "::tk::mac::OnHide");
break;
case kEventAppShown:
if (toggleHide == 1) {
toggleHide = 0;
if ((interp == NULL) ||
(Tcl_GetCommandInfo(interp,
"::tk::mac::OnShow", &dummy)) == 0) {
return eventNotHandledErr;
}
Tcl_GlobalEval(interp, "::tk::mac::OnShow");
}
break;
default:
break;
}
return eventNotHandledErr;
}
/*
*----------------------------------------------------------------------
*
* TkMacOSXInitCarbonEvents --
*
* This procedure initializes the Application CarbonEvent
* handler.
*
* Results:
* None.
*
* Side effects:
* A handler for Application targeted Carbon Events is registered.
*
*----------------------------------------------------------------------
*/
void
TkMacOSXInitCarbonEvents (
Tcl_Interp *interp)
{
const EventTypeSpec inAppEventTypes[] = {
{kEventClassApplication, kEventAppHidden},
{kEventClassApplication, kEventAppShown}};
int inNumTypes = sizeof (inAppEventTypes) / sizeof (EventTypeSpec);
InstallEventHandler(GetApplicationEventTarget(),
NewEventHandlerUPP(AppEventHandlerProc),
inNumTypes, inAppEventTypes, (void *) interp,
&ApplicationCarbonEventHandler);
}
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