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Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.

main.c

/*

    File:       main.c

    Abstract:   A skeleton of modern nib-based and Carbon Events-based Carbon application.

                ComboBoxPrefs maintains a list of recently accessed pictures within its combo box.

                It is a chronological list (CFArray) stored via CFPreferences.  We also override

                the standard behavior of the combo box to make it more like an address bar seen in

                web browsers.  When an item from the ComboBox list is double-clicked that item is

                loaded. ComboBoxPrefs also demonstrates how to create a CGImageRef from a URL pointing

                to a picture.  We use QuickTime Graphics Importers, QTNewDataReferenceFromCFURL,

                for automatic support of a wide variety of image types.

    Version:    1.0

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

                use, installation, modification or redistribution of this Apple software

                constitutes acceptance of these terms.  If you do not agree with these terms,

                please do not use, install, modify or redistribute this Apple software.

                In consideration of your agreement to abide by the following terms, and subject

                to these terms, Apple grants you a personal, non-exclusive license, under Apple's

                copyrights in this original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or without

                modifications, in source and/or binary forms; provided that if you redistribute

                the Apple Software in its entirety and without modifications, you must retain

                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

                GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

                ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

                OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

                (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    Copyright © 2005 Apple Computer, Inc., All Rights Reserved

*/

#include    <Carbon/Carbon.h>

#include    <Quicktime/Quicktime.h>

#include    <sys/param.h>

struct  GlobalAppInfo                           //  Application globals

    IBNibRef                mainNibRef;

    SInt32                  maxHistory;

};

typedef struct GlobalAppInfo GlobalAppInfo;

void    SendCommandProcessEvent( UInt32 commandID );

void    SendWindowCloseEvent( WindowRef window );

static  OSStatus    GetControlBySigAndID( WindowRef window, OSType  signature, SInt32 id, ControlRef *control );

static  void        InstallAppleEventHandlers( void );

static  void        DisplayPreferencesWindow( void );

static  pascal  OSStatus    CommandProcessEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *userData );    //  Added kHICommandRevert, kHICommandPageSetup, and kHICommandPrint

static  pascal  OSStatus    MainWindowEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *userData );

static  OSStatus    DoNewWindow( WindowRef *window );       //  Install Event Handler for Text view

static  pascal  OSStatus    PreferencesWindowEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData );

SInt16  GetControlValueByID( WindowRef window, OSType signature, SInt32 id );

void    SetControlValueByID( WindowRef window, OSType signature, SInt32 id, SInt32 value );

static  OSStatus    DisplayImageInWindow( WindowRef window, CFURLRef cfURL );

static  pascal  void    LiveAlphaSliderActionProc( ControlRef control, ControlPartCode partCode );

static  OSStatus    HIViewFindBySigAndID( HIViewRef inStartView, OSType signature, SInt32 id, HIViewRef *outControl );

static  pascal  OSStatus    ComboBoxEventHandler( EventHandlerCallRef inCallRef, EventRef inEvent, void *inUserData );

void    SaveComboBoxValues( HIViewRef comboBoxView );

void    RestoreComboBoxValues( HIViewRef comboBoxView );

GlobalAppInfo       g;

#pragma mark -

#pragma mark ¥ Main ¥

int main( int argc, char *argv[] )

    OSStatus                status;

    long                    response;

    CFNumberRef             cfNumber                    = NULL;

    const   EventTypeSpec   commandProcessEvents[]      = { { kEventClassCommand, kEventCommandProcess } };

    BlockZero( &g, sizeof(g) );

    status  = Gestalt( gestaltSystemVersion, &response );

    if ( ! ((status == noErr) && (response >= 0x00001030)) )            //  We require Mac OS X 10.3 or greater to run

        DialogRef   alertDialod;

        CreateStandardAlert( kAlertStopAlert, CFSTR("Mac OS X 10.3 (minimum) is required for this application"), NULL, NULL, &alertDialod );

        RunStandardAlert( alertDialod, NULL, NULL );

        ExitToShell();

    EnterMovies();                                                      //  Needed for use with QuickTimes Graphics Importers

    //  Create a Nib reference passing the name of the nib file (without the .nib extension) CreateNibReference only searches into the application bundle.

    status  = CreateNibReference( CFSTR("main"), &g.mainNibRef );

    require_noerr( status, CantGetNibRef );

    //  Read in our preferences, maximum urls to display in our combo box

    cfNumber    = (CFNumberRef) CFPreferencesCopyAppValue( CFSTR("MaxHistory"), kCFPreferencesCurrentApplication );

    if ( cfNumber != NULL )

        (void) CFNumberGetValue( cfNumber, kCFNumberSInt32Type, &g.maxHistory );

        CFRelease( cfNumber );

    else

        g.maxHistory    = 10;

    //  Once the nib reference is created, set the menu bar. "MainMenu" is the name of the menu bar object. This name is set in InterfaceBuilder when the nib is created.

    status  = SetMenuBarFromNib( g.mainNibRef, CFSTR("MenuBar") );

    require_noerr( status, CantSetMenuBar );

    EnableMenuCommand( NULL, kHICommandPreferences );                   //  Enable Preferences menu item

    InstallAppleEventHandlers();

    InstallApplicationEventHandler( NewEventHandlerUPP(CommandProcessEventHandler), GetEventTypeCount(commandProcessEvents), commandProcessEvents, NULL, NULL );

    RunApplicationEventLoop();                                          //  Call the event loop

CantSetMenuBar:

CantGetNibRef:

    return( status );

#pragma mark -

#pragma mark ¥ AppleEvent Handlers ¥

static  pascal  OSErr   HandleAppleEventOapp( const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon )

    SendCommandProcessEvent( kHICommandNew );                           // Instantiate an empty window at the beginning so the User sees something

    return( noErr );

static  pascal  OSErr   HandleAppleEventRapp( const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon )

    WindowRef   window  = GetFrontWindowOfClass( kDocumentWindowClass, true );

    if ( window == NULL )

        SendCommandProcessEvent( kHICommandNew );                       //  We were already running but with no windows so we create an empty one.

    return( noErr );

static  pascal  OSErr   HandleAppleEventOdoc( const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon )

    return( errAEEventNotHandled );

static  pascal  OSErr   HandleAppleEventPdoc( const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon )

    return( errAEEventNotHandled );

static  void    InstallAppleEventHandlers( void )

    OSErr       status;

    status  = AEInstallEventHandler( kCoreEventClass, kAEOpenApplication, NewAEEventHandlerUPP(HandleAppleEventOapp), 0, false );   require_noerr( status, CantInstallAppleEventHandler );

    status  = AEInstallEventHandler( kCoreEventClass, kAEReopenApplication, NewAEEventHandlerUPP(HandleAppleEventRapp), 0, false ); require_noerr( status, CantInstallAppleEventHandler );

    status  = AEInstallEventHandler( kCoreEventClass, kAEOpenDocuments, NewAEEventHandlerUPP(HandleAppleEventOdoc), 0, false );     require_noerr( status, CantInstallAppleEventHandler );

    status  = AEInstallEventHandler( kCoreEventClass, kAEPrintDocuments, NewAEEventHandlerUPP(HandleAppleEventPdoc), 0, false );    require_noerr( status, CantInstallAppleEventHandler );

    //  Note: Since RunApplicationEventLoop installs a Quit AE Handler, there is no need to do it here.

CantInstallAppleEventHandler:

    return;

#pragma mark -

#pragma mark ¥ CarbonEvent Handlers ¥

static  pascal  OSStatus    CommandProcessEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *userData )

    HICommand       command;

    OSStatus        status          = eventNotHandledErr;

    GetEventParameter( inEvent, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &command );

    switch ( command.commandID )

        case kHICommandNew:

            status  = DoNewWindow( NULL );

            break;

        case kHICommandPreferences:

            DisplayPreferencesWindow();

            break;

    return( status );

static  pascal  OSStatus    MainWindowEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *inUserData )

    #pragma unused ( inCallRef )

    HICommand       command;

    OSStatus        status          = eventNotHandledErr;

    UInt32          eventKind       = GetEventKind( inEvent );

    UInt32          eventClass      = GetEventClass( inEvent );

    WindowRef       window          = (WindowRef) inUserData;

    switch ( eventClass )

        case kEventClassWindow:

            //if ( eventKind == kEventWindowClose )                             //  Dispose extra window storage here

            break;

        case kEventClassCommand:

            if ( eventKind == kEventCommandProcess )

                GetEventParameter( inEvent, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &command );

                if ( command.commandID == kHICommandOK )                        //  OK (Execute) Button was clicked in window

                    HIViewRef       comboBoxView;

                    CFURLRef        urlRef          = NULL;

                    CFStringRef     urlString       = NULL;

                    status  = HIViewFindBySigAndID( HIViewGetRoot(window), 'Cmbo', 0, &comboBoxView );

                    status  = GetControlData( comboBoxView, kControlEditTextPart, kControlEditTextCFStringTag, sizeof( CFStringRef ), &urlString, NULL );   //  Get the current text as a CFURL from the Combo Box

                    urlRef  = CFURLCreateWithString( kCFAllocatorDefault, urlString, NULL );                    //  Create a CFURL from the CFString

                    SaveComboBoxValues( comboBoxView );

                    status  = DisplayImageInWindow( window, urlRef );

                    if ( urlString != NULL )    CFRelease( urlString );

                    if ( urlRef != NULL )       CFRelease( urlRef );

            break;

    return( status );

#pragma mark -

#pragma mark ¥ Windows ¥

static  void    DisplayPreferencesWindow( void )

{                                                                               //  Entry point for a preferences window

    WindowRef                   window;

    OSErr                       err;

    static  EventHandlerUPP     preferencesWindowEventHandlerUPP;

    const EventTypeSpec         windowEvents[]      =   {   { kEventClassCommand, kEventCommandProcess }, { kEventClassWindow, kEventWindowClose }  };

    err = CreateWindowFromNib( g.mainNibRef, CFSTR("PreferencesWindow"), &window );

    if ( err != noErr ) goto Bail;

    SetControlValueByID( window, 'PopM', 0, (g.maxHistory / 5) + 1 );           //  We use a 5X algorithm.  0, 5, 10, 15, ...

    if ( preferencesWindowEventHandlerUPP == NULL ) preferencesWindowEventHandlerUPP    = NewEventHandlerUPP( PreferencesWindowEventHandlerProc );

    err = InstallWindowEventHandler( window, preferencesWindowEventHandlerUPP, GetEventTypeCount(windowEvents), windowEvents, window, NULL );

    if ( err == noErr )

        ShowWindow( window );

        (void) RunAppModalLoopForWindow( window );                              //  Run the preferences window as application modal

Bail:

    return;

static  pascal  OSStatus    PreferencesWindowEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData )

#pragma unused ( inCallRef )

    HICommand               command;

    CFNumberRef             cfNumber        = NULL;

    WindowRef               window          = (WindowRef) inUserData;

    UInt32                  eventClass      = GetEventClass( inEvent );

    UInt32                  eventKind       = GetEventKind( inEvent );

    switch ( eventClass )

        case kEventClassWindow:

            if ( eventKind == kEventWindowClose )

                (void) QuitAppModalLoopForWindow( window );

            break;

        case kEventClassCommand:

            if ( eventKind == kEventCommandProcess )

                GetEventParameter( inEvent, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &command );

                if ( command.commandID == kHICommandOK )

                    g.maxHistory    = ( (GetControlValueByID( window, 'PopM', 0 ) - 1) * 5 );           //  We use a 5X algorithm.  0, 5, 10, 15, ...

                    cfNumber    = CFNumberCreate( NULL, kCFNumberSInt32Type, &g.maxHistory );

                    CFPreferencesSetAppValue( CFSTR("MaxHistory"), cfNumber, kCFPreferencesCurrentApplication );

                    if ( cfNumber != NULL ) CFRelease( cfNumber );

                    (void) CFPreferencesAppSynchronize( kCFPreferencesCurrentApplication );             //  Write prefs to disk!

                if ( (command.commandID == kHICommandOK) || (command.commandID == kHICommandCancel) )

                    SendWindowCloseEvent( window );                                                     //  Send ourselves a kEventWindowClose event

            break;

    return( eventNotHandledErr );

static  OSStatus    DoNewWindow( WindowRef *outWindow )

    OSStatus                    status;

    HIViewRef                   comboBoxView;

    static  EventHandlerUPP     windowEventHandlerUPP;

    static  EventHandlerUPP     comboBoxEventHandlerUPP;

    WindowRef                   window              = NULL;

    const   EventTypeSpec       windowEvents[]      =   {   { kEventClassCommand, kEventCommandProcess }, { kEventClassWindow, kEventWindowClose }  };

    const   EventTypeSpec       comboBoxEvents[]    =   {   { kEventClassControl, kEventControlHiliteChanged } };

    //  Create a window. "MainWindow" is the name of the window object. This name is set in InterfaceBuilder when the nib is created.

    status  = CreateWindowFromNib( g.mainNibRef, CFSTR("MainWindow"), &window );

    require_noerr( status, CantCreateWindow );

    if ( windowEventHandlerUPP == NULL ) windowEventHandlerUPP  = NewEventHandlerUPP( MainWindowEventHandler );

    status  = InstallWindowEventHandler( window, windowEventHandlerUPP, GetEventTypeCount(windowEvents), windowEvents, window, NULL );

    require_noerr( status, CantInstallWindowEventHandler );

    status  = HIViewFindBySigAndID( HIViewGetRoot(window), 'Cmbo', 0, &comboBoxView );

    if ( comboBoxEventHandlerUPP == NULL ) comboBoxEventHandlerUPP  = NewEventHandlerUPP( ComboBoxEventHandler );

    status  = InstallControlEventHandler( comboBoxView, comboBoxEventHandlerUPP, GetEventTypeCount(comboBoxEvents), comboBoxEvents, comboBoxView, NULL );

    require_noerr( status, CantInstallWindowEventHandler );

    RestoreComboBoxValues( comboBoxView );              //  Load the saved locations into our ComboBox control list

    //  The window was created hidden so show it if the window parameter is NULL, if it's not, it will be the responsibility of the caller to show it.

    if ( outWindow == NULL )    ShowWindow( window );

    SetWindowModified( window, false );

CantInstallWindowEventHandler:

CantCreateWindow:

    if ( outWindow != NULL )    *outWindow  = window;

    return( status );

//  We modify the behavior of the combo box by making it more interactive, similar to the way the Safari address bar behaves.

//  When an item is double clicked from the combo box list it is automatically loaded.

static  pascal  OSStatus    ComboBoxEventHandler( EventHandlerCallRef inCallRef, EventRef inEvent, void *inUserData )

    ControlPartCode             previousPartCode;

    HIViewRef                   comboBoxView        = (HIViewRef) inUserData;

    UInt32                      eventClass          = GetEventClass( inEvent );

    UInt32                      eventKind           = GetEventKind( inEvent );

    OSStatus                    status              = eventNotHandledErr;

    switch ( eventClass )

        case kEventClassControl:

            if ( eventKind == kEventControlHiliteChanged )

                CFURLRef            urlRef          = NULL;

                CFStringRef         currentCFString = NULL;

                CFStringRef         urlCFString     = NULL;

                (void) GetControlProperty( comboBoxView, 'Crnt', 'URL_', sizeof(CFStringRef), NULL, &currentCFString ); //  We store the most recent url as a control property

                (void) GetControlData( comboBoxView, kControlEditTextPart, kControlEditTextCFStringTag, sizeof( CFStringRef ), &urlCFString, NULL );

                if ( (currentCFString == NULL) || (CFStringCompare( currentCFString, urlCFString, 0 ) != kCFCompareEqualTo) )   //  Has the url changed?

                    (void) GetEventParameter( inEvent, kEventParamControlPreviousPart, typeControlPartCode, NULL, sizeof(ControlPartCode), NULL, &previousPartCode );

                    if ( previousPartCode == kHIComboBoxDisclosurePart )                                                //  Tells us an item has been selected from the list

                        CFRetain( urlCFString );

                        SetControlProperty( comboBoxView, 'Crnt', 'URL_', sizeof(CFStringRef), &urlCFString );          //  Save the url as a control property for checking later

                        SaveComboBoxValues( comboBoxView );

                        urlRef  = CFURLCreateWithString( kCFAllocatorDefault, urlCFString, NULL );

                        (void) DisplayImageInWindow( GetControlOwner(comboBoxView), urlRef );                           //  Display the image pointed to by the url in the window

                        if ( urlRef != NULL )           CFRelease( urlRef );

                        if ( urlCFString != NULL )      CFRelease( urlCFString );

            break;

    return( status );

#pragma mark -

#pragma mark ¥ Save/Open Document ¥

#pragma mark -

#pragma mark ¥ Utilities ¥

//  Utility routine to synchronously send a basic "kEventClassCommand / kEventCommandProcess" CarbonEvent to the application target

void    SendCommandProcessEvent( UInt32 commandID )

    HICommand               command;

    EventRef                event;

    BlockZero( &command, sizeof(command) );

    command.commandID   = commandID;

    (void) CreateEvent( NULL,  kEventClassCommand, kEventCommandProcess, GetCurrentEventTime(), kEventAttributeUserEvent, &event );

    (void) SetEventParameter( event, kEventParamDirectObject, typeHICommand, sizeof(command), &command );

    (void) SendEventToApplication( event );

    (void) ReleaseEvent( event );

//  Utility routine to synchronously send a basic "kEventClassWindow / kEventWindowClose" CarbonEvent to the window target

void    SendWindowCloseEvent( WindowRef window )

    EventRef                event;

    (void) CreateEvent( NULL,  kEventClassWindow, kEventWindowClose, GetCurrentEventTime(), kEventAttributeUserEvent, &event );

    (void) SetEventParameter( event, kEventParamDirectObject, typeWindowRef, sizeof(window), &window );

    (void) SendEventToWindow( event, window );

    (void) ReleaseEvent( event );

static  OSStatus    HIViewFindBySigAndID( HIViewRef inStartView, OSType signature, SInt32 id, HIViewRef *outControl )

    HIViewID    hiViewID = { signature, id };

    return( HIViewFindByID( inStartView, hiViewID, outControl ) );

static  OSStatus    GetControlBySigAndID( WindowRef window, OSType  signature, SInt32 id, ControlRef *control )

    ControlID   controlID   = { signature, id };

    return( GetControlByID( window, &controlID, control ) );

void    SetControlValueByID( WindowRef window, OSType signature, SInt32 id, SInt32 value )

    ControlRef      control;

    GetControlBySigAndID( window, signature, id, &control );

    if ( control == NULL ) goto Bail;

    SetControlValue( control, value );

    Draw1Control( control );

Bail:

    return;

SInt16  GetControlValueByID( WindowRef window, OSType signature, SInt32 id )

    ControlRef      control;

    GetControlBySigAndID( window, signature, id, &control );

    if ( control == NULL ) return( 0 );

    return( GetControlValue(control) );

#pragma mark -

#pragma mark ¥ Specialized Routines ¥

//  Given a URL to an image, display it in our HIImageView which is embeded in an HIScrollView.

static  OSStatus    DisplayImageInWindow( WindowRef window, CFURLRef cfURL )

    OSStatus                    status;

    HIViewRef                   hiImageView;

    ControlRef                  control;

    OSType                      dataRefType;

    static  ControlActionUPP    sliderControlActionUPP;

    GraphicsImportComponent     ci                  = NULL;

    CGImageRef                  cgImageRef          = NULL;

    Handle                      dataRef             = NULL;

    require( (cfURL != NULL) && (window != NULL), Bail );

    //  Install a slider action proc to modify the image alpha live

    status  = GetControlBySigAndID( window, 'Sldr', 1, &control );  require_noerr( status, Bail );

    if ( sliderControlActionUPP == NULL )       sliderControlActionUPP  = NewControlActionUPP( LiveAlphaSliderActionProc );

    SetControlAction( control, sliderControlActionUPP );

    //  We use the powerful combination of QTNewDataReferenceFromCFURL, GetGraphicsImporterForDataRef, and GraphicsImportCreateCGImage to create a CGImage

    //  From a url which points to any media type supported by QuickTime Graphics Importers.

    status  = QTNewDataReferenceFromCFURL( cfURL, 0, &dataRef, &dataRefType );                                              //  Create the DataRef from a URL

    status  = GetGraphicsImporterForDataRef( dataRef, dataRefType, &ci );       require( ci != NULL, Bail );                //  Get the QT GraphicsImporter for the data ref

    status  = GraphicsImportCreateCGImage( ci, &cgImageRef, kGraphicsImportCreateCGImageUsingCurrentSettings );             //  Use the GraphicsImporter to create a CGImage

    //  Set up the image default characteristics

    status  = HIViewFindBySigAndID( HIViewGetRoot(window), 'HIiv', 1, &hiImageView );   require_noerr( status, Bail );      //  Get the HIImageView

    status  = HIImageViewSetImage( hiImageView, cgImageRef );       require_noerr( status, Bail );                          //  Set the image of the HIImageView

    status  = HIImageViewSetOpaque( hiImageView, false );           require_noerr( status, Bail );                          //  Image can have transparency

    status  = HIImageViewSetAlpha( hiImageView, GetControl32BitValue(control) / 100.0 );    require_noerr( status, Bail );  //  Set the image alpha

    status  = HIImageViewSetScaleToFit( hiImageView, false );       require_noerr( status, Bail );                          //  Don't scale the image, it's embeded in an HIScrollView so scaling doesn't make much sense

    status  = HIViewSetVisible( hiImageView, true );                require_noerr( status, Bail );                          //  Make it visible

Bail:

    if ( ci != NULL )               CloseComponent( ci );                       else    status  = -1;

    if ( dataRef != NULL )          DisposeHandle( dataRef );                   else    status  = -1;

    if ( cgImageRef != NULL )       CFRelease( cgImageRef );                    else    status  = -1;

    return( status );

//  ControlActionProc for slider to adjust image alpha live. ControlActionProc's are needed for live slider feedback.

static  pascal  void    LiveAlphaSliderActionProc( ControlRef control, ControlPartCode partCode )

    OSStatus                    status;

    HIViewRef                   hiImageView;

    float                       alpha           = GetControl32BitValue(control) / 100.0;

    status  = HIViewFindBySigAndID( HIViewGetRoot(GetControlOwner(control)), 'HIiv', 1, &hiImageView ); require_noerr( status, Bail );

    status  = HIImageViewSetAlpha( hiImageView, alpha );                                require_noerr( status, Bail );

Bail:

    return;

//  Given a combo box control, keep it sorted chronologically, and store its current list values in "HistoryEntries" appliocation preference

//  1) Moves the current combo box entry to the top of its CFArray list

//  2) Truncates array to contain no more than g.maxHistory entries

//  3) Saves a CFArray of the list in its "HistoryEntries" preference

//  4) Updates the combo box entries for display

void    SaveComboBoxValues( HIViewRef comboBoxView )

    OSStatus                status;

    CFArrayRef              cfArray;

    CFIndex                 count;

    CFStringRef             cfString;

    CFMutableArrayRef       cfMutableArray  = NULL;

    CFStringRef             urlString       = NULL;

    status  = GetControlData( comboBoxView, kHIComboBoxDisclosurePart, kHIComboBoxListTag, sizeof(cfArray), (Ptr)&cfArray, NULL );          //  Get the combo box list entries

    cfMutableArray  = CFArrayCreateMutableCopy( NULL, g.maxHistory, cfArray );                                                              //  Make a mutable copy for modification

    status  = GetControlData( comboBoxView, kControlEditTextPart, kControlEditTextCFStringTag, sizeof( CFStringRef ), &urlString, NULL );   //  Get the current entry in the text portion

    for ( count = CFArrayGetCount( cfMutableArray ) - 1 ; count >= 0 ; count-- )                        //  If the current url is in the list, delete it, to add it to the top of the list

        cfString    = (CFStringRef) CFArrayGetValueAtIndex( cfMutableArray, count );

        if ( CFStringCompare( cfString, urlString, kCFCompareCaseInsensitive ) == kCFCompareEqualTo )   //  Compare each list entry to the current text entry

            CFArrayRemoveValueAtIndex( cfMutableArray, count );                                         //  Remove any duplicates

    for ( count = CFArrayGetCount( cfMutableArray ) - 1 ; count >= g.maxHistory - 1 ; count-- )         //  Remove extra array values beyond g.maxHistory

        CFArrayRemoveValueAtIndex( cfMutableArray, count );

    CFArrayInsertValueAtIndex( cfMutableArray, 0, (const void *) urlString );                           //  Insert our new entry at the top of the list

    CFPreferencesSetAppValue( CFSTR("HistoryEntries"), cfMutableArray, kCFPreferencesCurrentApplication );

    (void) CFPreferencesAppSynchronize( kCFPreferencesCurrentApplication );                             //  Save the modified list to our application "HistoryEntries" preferences

    RestoreComboBoxValues( comboBoxView );                                                              //  Since the list now contains the text entry and modifications, refresh the combo box list

    if ( cfMutableArray != NULL )   CFRelease( cfMutableArray );

//  Read in the combo box preferences and populate the combo box with those "HistoryEntries" preferences.

void    RestoreComboBoxValues( HIViewRef comboBoxView )

    CFArrayRef              cfArray                 = NULL;

    cfArray = (CFArrayRef) CFPreferencesCopyAppValue( CFSTR("HistoryEntries"), kCFPreferencesCurrentApplication );

    if ( cfArray != NULL )

        (void) SetControlData( comboBoxView, kHIComboBoxDisclosurePart, kHIComboBoxListTag, sizeof(cfArray), &cfArray );

        CFRelease( cfArray );

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