/* * tkMacOSXCarbonEvents.c -- * * This file implements functions that register for and handle * various Carbon Events and Timers. Most carbon events of interest * to TkAqua are processed in a handler registered on the dispatcher * event target so that we get first crack at them before HIToolbox * dispatchers/processes them further. * As some events are sent directly to the focus or app event target * and not dispatched normally, we also register a handler on the * application event target. * * Copyright 2001, Apple Computer, Inc. * Copyright (c) 2005 Daniel A. Steffen * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * * 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. * * RCS: @(#) $Id: tkMacOSXCarbonEvents.c,v 1.3.2.14 2006/08/21 01:09:32 das Exp $ */ #include "tkMacOSXInt.h" #include "tkMacOSXEvent.h" #include "tkMacOSXDebug.h" /* #ifdef TK_MAC_DEBUG #define TK_MAC_DEBUG_CARBON_EVENTS #endif */ /* Declarations of functions used only in this file */ static OSStatus CarbonEventHandlerProc(EventHandlerCallRef callRef, EventRef event, void *userData); static OSStatus InstallStandardApplicationEventHandler(); static void ExitRaelEventHandlerProc (EventHandlerCallRef, EventRef, void*) __attribute__ ((__noreturn__)); static void CarbonTimerProc(EventLoopTimerRef timer, void *userData); /* Static data used by several functions in this file */ static jmp_buf exitRaelJmpBuf; static EventLoopTimerRef carbonTimer = NULL; static int carbonTimerEnabled = 0; /* *---------------------------------------------------------------------- * * CarbonEventHandlerProc -- * * This procedure is the handler for all registered CarbonEvents. * * Results: * OS status code. * * Side effects: * Dispatches CarbonEvents. * *---------------------------------------------------------------------- */ static OSStatus CarbonEventHandlerProc ( EventHandlerCallRef callRef, EventRef event, void *userData) { OSStatus result = eventNotHandledErr; TkMacOSXEvent macEvent; MacEventStatus eventStatus; macEvent.eventRef = event; macEvent.eClass = GetEventClass(macEvent.eventRef); macEvent.eKind = GetEventKind(macEvent.eventRef); macEvent.interp = (Tcl_Interp *) userData; bzero(&eventStatus, sizeof(eventStatus)); #if defined(TK_MAC_DEBUG) && defined(TK_MAC_DEBUG_CARBON_EVENTS) char buf [256]; if (macEvent.eKind != kEventMouseMoved && macEvent.eKind != kEventMouseDragged) { CarbonEventToAscii(event, buf); fprintf(stderr, "CarbonEventHandlerProc started handling %s\n", buf); TkMacOSXInitNamedDebugSymbol(HIToolbox, void, _DebugPrintEvent, EventRef inEvent); if (_DebugPrintEvent) { /* Carbon-internal event debugging (c.f. Technote 2124) */ _DebugPrintEvent(event); } } #endif /* TK_MAC_DEBUG_CARBON_EVENTS */ TkMacOSXProcessEvent(&macEvent,&eventStatus); if (eventStatus.stopProcessing) { result = noErr; } #if defined(TK_MAC_DEBUG) && defined(TK_MAC_DEBUG_CARBON_EVENTS) if (macEvent.eKind != kEventMouseMoved && macEvent.eKind != kEventMouseDragged) { fprintf(stderr, "CarbonEventHandlerProc finished handling %s: %s handled\n", buf, eventStatus.stopProcessing ? " " : "not"); } #endif /* TK_MAC_DEBUG_CARBON_EVENTS */ return result; } /* *---------------------------------------------------------------------- * * TkMacOSXInitCarbonEvents -- * * This procedure initializes all CarbonEvent handlers. * * Results: * None. * * Side effects: * Handlers for Carbon Events are registered. * *---------------------------------------------------------------------- */ MODULE_SCOPE void TkMacOSXInitCarbonEvents ( Tcl_Interp *interp) { OSStatus err; const EventTypeSpec dispatcherEventTypes[] = { {kEventClassMouse, kEventMouseDown}, {kEventClassMouse, kEventMouseUp}, {kEventClassMouse, kEventMouseMoved}, {kEventClassMouse, kEventMouseDragged}, {kEventClassMouse, kEventMouseWheelMoved}, {kEventClassWindow, kEventWindowUpdate}, {kEventClassWindow, kEventWindowActivated}, {kEventClassWindow, kEventWindowDeactivated}, {kEventClassKeyboard, kEventRawKeyDown}, {kEventClassKeyboard, kEventRawKeyRepeat}, {kEventClassKeyboard, kEventRawKeyUp}, {kEventClassKeyboard, kEventRawKeyModifiersChanged}, {kEventClassKeyboard, kEventRawKeyRepeat}, {kEventClassApplication, kEventAppActivated}, {kEventClassApplication, kEventAppDeactivated}, {kEventClassApplication, kEventAppQuit}, }; const EventTypeSpec applicationEventTypes[] = { {kEventClassMenu, kEventMenuBeginTracking}, {kEventClassMenu, kEventMenuEndTracking}, {kEventClassCommand, kEventCommandProcess}, {kEventClassCommand, kEventCommandUpdateStatus}, {kEventClassMouse, kEventMouseWheelMoved}, {kEventClassWindow, kEventWindowExpanded}, {kEventClassApplication, kEventAppHidden}, {kEventClassApplication, kEventAppShown}, {kEventClassApplication, kEventAppAvailableWindowBoundsChanged}, }; EventHandlerUPP handler = NewEventHandlerUPP(CarbonEventHandlerProc); err = InstallStandardApplicationEventHandler(); if (err != noErr) { #ifdef TK_MAC_DEBUG fprintf(stderr, "InstallStandardApplicationEventHandler failed, %d\n", (int) err); #endif } err = InstallEventHandler(GetEventDispatcherTarget(), handler, GetEventTypeCount(dispatcherEventTypes), dispatcherEventTypes, (void *) interp, NULL); if (err != noErr) { #ifdef TK_MAC_DEBUG fprintf(stderr, "InstallEventHandler failed, %d\n", (int) err); #endif } err = InstallEventHandler(GetApplicationEventTarget(), handler, GetEventTypeCount(applicationEventTypes), applicationEventTypes, (void *) interp, NULL); if (err != noErr) { #ifdef TK_MAC_DEBUG fprintf(stderr, "InstallEventHandler failed, %d\n", (int) err); #endif } #if defined(TK_MAC_DEBUG) && defined(TK_MAC_DEBUG_CARBON_EVENTS) TkMacOSXInitNamedDebugSymbol(HIToolbox, void, TraceEventByName, char*); if (TraceEventByName) { /* Carbon-internal event debugging (c.f. Technote 2124) */ TraceEventByName("kEventMouseDown"); TraceEventByName("kEventMouseUp"); TraceEventByName("kEventMouseWheelMoved"); TraceEventByName("kEventMouseScroll"); TraceEventByName("kEventWindowUpdate"); TraceEventByName("kEventWindowActivated"); TraceEventByName("kEventWindowDeactivated"); TraceEventByName("kEventRawKeyDown"); TraceEventByName("kEventRawKeyRepeat"); TraceEventByName("kEventRawKeyUp"); TraceEventByName("kEventRawKeyModifiersChanged"); TraceEventByName("kEventRawKeyRepeat"); TraceEventByName("kEventAppActivated"); TraceEventByName("kEventAppDeactivated"); TraceEventByName("kEventAppQuit"); TraceEventByName("kEventMenuBeginTracking"); TraceEventByName("kEventMenuEndTracking"); TraceEventByName("kEventCommandProcess"); TraceEventByName("kEventCommandUpdateStatus"); TraceEventByName("kEventWindowExpanded"); TraceEventByName("kEventAppHidden"); TraceEventByName("kEventAppShown"); TraceEventByName("kEventAppAvailableWindowBoundsChanged"); } #endif /* TK_MAC_DEBUG_CARBON_EVENTS */ } /* *---------------------------------------------------------------------- * * InstallStandardApplicationEventHandler -- * * This procedure installs the carbon standard application event * handler. * * Results: * OS status code. * * Side effects: * Standard handlers for application Carbon Events are registered. * *---------------------------------------------------------------------- */ static OSStatus InstallStandardApplicationEventHandler() { /* * This is a hack to workaround missing Carbon API to install the standard * application event handler (InstallStandardEventHandler() does not work * on the application target). The only way to install the standard app * handler is to call RunApplicationEventLoop(), but since we are running * our own event loop, we'll immediately need to break out of RAEL again: * we do this via longjmp out of the ExitRaelEventHandlerProc event handler * called first off from RAEL by posting a high priority dummy event. * This workaround is derived from a similar approach in Technical Q&A 1061. */ enum { kExitRaelEvent = 'ExiT' }; const EventTypeSpec exitRaelEventType = { kExitRaelEvent, kExitRaelEvent}; EventHandlerUPP exitRaelEventHandler; EventHandlerRef exitRaelEventHandlerRef = NULL; EventRef exitRaelEvent = NULL; OSStatus err = memFullErr; exitRaelEventHandler = NewEventHandlerUPP( (EventHandlerProcPtr) ExitRaelEventHandlerProc); if (exitRaelEventHandler) { err = InstallEventHandler(GetEventDispatcherTarget(), exitRaelEventHandler, 1, &exitRaelEventType, NULL, &exitRaelEventHandlerRef); } if (err == noErr) { err = CreateEvent(NULL, kExitRaelEvent, kExitRaelEvent, GetCurrentEventTime(), kEventAttributeNone, &exitRaelEvent); } if (err == noErr) { err = PostEventToQueue(GetMainEventQueue(), exitRaelEvent, kEventPriorityHigh); } if (err == noErr) { if (!setjmp(exitRaelJmpBuf)) { RunApplicationEventLoop(); /* This point should never be reached ! */ Tcl_Panic("RunApplicationEventLoop exited !"); } } if (exitRaelEvent) { ReleaseEvent(exitRaelEvent); } if (exitRaelEventHandlerRef) { RemoveEventHandler(exitRaelEventHandlerRef); } if (exitRaelEventHandler) { DisposeEventHandlerUPP(exitRaelEventHandler); } return err; } /* *---------------------------------------------------------------------- * * ExitRaelEventHandlerProc -- * * This procedure is the dummy event handler used to break out of * RAEL via longjmp, it is called as the first ever event handler * in RAEL by posting a high priority dummy event. * * Results: * None. Never returns ! * * Side effects: * longjmp back to InstallStandardApplicationEventHandler(). * *---------------------------------------------------------------------- */ static void ExitRaelEventHandlerProc ( EventHandlerCallRef callRef, EventRef event, void *userData) { longjmp(exitRaelJmpBuf, 1); } /* *---------------------------------------------------------------------- * * CarbonTimerProc -- * * This procedure is the carbon timer handler that runs the tcl * event loop periodically. It does not process TCL_WINDOW_EVENTS * to avoid reentry issues with Carbon, nor TCL_IDLE_EVENTS since * it is only intended to be called during short periods of busy * time such as during menu tracking. * * Results: * None. * * Side effects: * Runs the Tcl event loop. * *---------------------------------------------------------------------- */ static void CarbonTimerProc ( EventLoopTimerRef timer, void *userData) { if(carbonTimerEnabled) { /* Avoid starving main event loop: process at most 4 events. */ int i = 4; while(--i && Tcl_DoOneEvent( TCL_FILE_EVENTS|TCL_TIMER_EVENTS|TCL_DONT_WAIT)) { #if defined(TK_MAC_DEBUG) && defined(TK_MAC_DEBUG_CARBON_EVENTS) fprintf(stderr, "Processed tcl event from carbon timer\n"); #endif /* TK_MAC_DEBUG_CARBON_EVENTS */ } } } /* *---------------------------------------------------------------------- * * TkMacOSXStartTclEventLoopCarbonTimer -- * * This procedure installs (if necessary) and starts a carbon * event timer that runs the tcl event loop periodically. * It should be called whenever a nested carbon event loop is * run by HIToolbox (e.g. during menutracking) to ensure that * non-window non-idle tcl events are processed. * * Results: * OS status code. * * Side effects: * Carbon event timer is installed and started. * *---------------------------------------------------------------------- */ MODULE_SCOPE OSStatus TkMacOSXStartTclEventLoopCarbonTimer() { OSStatus err; if(!carbonTimer) { EventLoopTimerUPP timerUPP = NewEventLoopTimerUPP(CarbonTimerProc); err = InstallEventLoopTimer(GetMainEventLoop(), kEventDurationNoWait, 5 * kEventDurationMillisecond, timerUPP, NULL, &carbonTimer); if (err != noErr) { #ifdef TK_MAC_DEBUG fprintf(stderr, "InstallEventLoopTimer failed, %d\n", (int) err); #endif } } else { err = SetEventLoopTimerNextFireTime(carbonTimer, kEventDurationNoWait); if (err != noErr) { #ifdef TK_MAC_DEBUG fprintf(stderr, "SetEventLoopTimerNextFireTime failed, %d\n", (int) err); #endif } } carbonTimerEnabled = 1; return err; } /* *---------------------------------------------------------------------- * * TkMacOSXStopTclEventLoopCarbonTimer -- * * This procedure stops the carbon event timer started by * TkMacOSXStartTclEventLoopCarbonTimer(). * * Results: * OS status code. * * Side effects: * Carbon event timer is stopped. * *---------------------------------------------------------------------- */ MODULE_SCOPE OSStatus TkMacOSXStopTclEventLoopCarbonTimer() { OSStatus err = noErr; if(carbonTimer) { err = SetEventLoopTimerNextFireTime(carbonTimer, kEventDurationForever); if (err != noErr) { #ifdef TK_MAC_DEBUG fprintf(stderr, "SetEventLoopTimerNextFireTime failed, %d\n", (int) err); #endif } } carbonTimerEnabled = 0; return err; }