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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<pre class="sourcecodebox">/*
File: main.c
Abstract: This source demonstrates how to use NSCursor from a Carbon based application.
We provide some wrapper functions CreateCocoaCursor, ReleaseCocoaCursor, and SetCocoaCursor
to abstract the underlying Cocoa calls to manage the cursor. NSCursor provides support for
large cursors, alpha, and hot spots.
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 © 2006 Apple Computer, Inc., All Rights Reserved
*/
#include <Carbon/Carbon.h>
#include <Cocoa/Cocoa.h>
#include "NSCursorWrappers.h"
static OSStatus DoNewWindow( WindowRef *outWindow );
static OSStatus CommandProcessEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *userData );
static OSStatus HIViewFindBySigAndID( HIViewRef inStartView, OSType signature, SInt32 id, HIViewRef *outControl );
static OSStatus CursorEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *inUserData );
static OSStatus MainWindowEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *inUserData );
CursorRef SetCursorFromCFURL( CFURLRef urlToImage );
IBNibRef gMainNibRef;
struct CustomCursorStruct {
CursorRef *cursor;
};
typedef struct CustomCursorStruct CustomCursorStruct;
int main( int argc, char *argv[] )
{
OSStatus status;
const EventTypeSpec commandProcessEvents[] = { { kEventClassCommand, kEventCommandProcess } };
status = CreateNibReference( CFSTR("main"), &gMainNibRef );
require_noerr( status, CantGetNibRef );
// 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( gMainNibRef, CFSTR("MenuBar") );
require_noerr( status, CantSetMenuBar );
InstallApplicationEventHandler( NewEventHandlerUPP(CommandProcessEventHandler), GetEventTypeCount(commandProcessEvents), commandProcessEvents, NULL, NULL );
NSApplicationLoad(); // Needed for Carbon based applications which call into Cocoa
// As of Mac OS X 10.4 RunApplicationEventLoop handles the autorelease pool for us. But since we are invoking Obj-C Cocoa code from within
// routines called by DoNewWindow, and we haven't yet called RAEL, we need to allocate and release the autorelease pool ourselves.
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
DoNewWindow( NULL );
[pool release];
RunApplicationEventLoop(); // Call the event loop
CantSetMenuBar:
CantGetNibRef:
return( 0 );
}
//------------------------------------------------------------------------------
// GetPasteboardFromDragEvent
//------------------------------------------------------------------------------
//
static PasteboardRef GetPasteboardFromDragEvent(
EventRef inEvent )
{
DragRef drag;
PasteboardRef pasteboard = NULL;
// get the drag pasteboard, if it exists
require_noerr( GetEventParameter( inEvent, kEventParamDragRef, typeDragRef, NULL, sizeof( DragRef ),
NULL, &drag ), CantGetDragRefFromEvent );
GetDragPasteboard( drag, &pasteboard );
CantGetDragRefFromEvent:
return pasteboard;
}
// Creates a CGImageRef from a URL. Caller is responsible for disposing of it.
CGImageRef CGImageCreateFromURL( CFURLRef urlToImage )
{
CGImageSourceRef imageSource = CGImageSourceCreateWithURL( urlToImage, NULL );
CGImageRef theImage = nil;
require( imageSource != nil, CantCreateImageSource );
theImage = CGImageSourceCreateImageAtIndex( imageSource, 0, NULL );
require( theImage != nil, CantGetImage );
CFRelease( imageSource );
CantCreateImageSource:
CantGetImage:
return( theImage );
}
//------------------------------------------------------------------------------
// CreateFileURLFromPasteboard
//------------------------------------------------------------------------------
//
static CFURLRef CreateFileURLFromPasteboard(
PasteboardRef inPasteboard,
CFIndex inIndex )
{
PasteboardItemID item;
CFDataRef fileURLData;
CFURLRef fileURL = NULL;
LSItemInfoRecord info;
CFStringRef uti = NULL;
bool isSupported = false;
require_noerr( PasteboardGetItemIdentifier( inPasteboard, inIndex, &item ), CantGetPasteboardIdentifier );
require_noerr_quiet( PasteboardCopyItemFlavorData( inPasteboard, item, kUTTypeFileURL, &fileURLData ),
CantCopyFileURLFromPasteboard );
// create the file URL with the dragged data
fileURL = CFURLCreateWithBytes( kCFAllocatorDefault, CFDataGetBytePtr( fileURLData ), CFDataGetLength( fileURLData ),
kCFStringEncodingMacRoman, NULL );
// get the UTI for the dragged file
require_noerr( LSCopyItemInfoForURL( fileURL, kLSRequestExtension | kLSRequestTypeCreator, &info ), CantCopyItemInfo );
if ( info.extension != NULL )
{
uti = UTTypeCreatePreferredIdentifierForTag( kUTTagClassFilenameExtension, info.extension, kUTTypeData );
CFRelease( info.extension );
}
if ( uti == NULL )
{
CFStringRef typeString = UTCreateStringForOSType( info.filetype );
if ( typeString != NULL )
{
uti = UTTypeCreatePreferredIdentifierForTag( kUTTagClassOSType, typeString, kUTTypeData );
CFRelease( typeString );
}
}
require( uti != NULL, CantCreateFileUTI );
// verify we're dealing with a file that ImageIO can understand
{
CFArrayRef supportedTypes = CGImageSourceCopyTypeIdentifiers();
CFIndex i, typeCount = CFArrayGetCount( supportedTypes );
for( i = 0; i < typeCount; i++ )
{
if ( UTTypeConformsTo( uti, (CFStringRef)CFArrayGetValueAtIndex( supportedTypes, i ) ) )
{
isSupported = true;
break;
}
}
CFRelease( supportedTypes );
}
CFRelease( uti );
CantCreateFileUTI:
CantCopyItemInfo:
if ( !isSupported )
{
CFRelease( fileURL );
fileURL = NULL;
}
CFRelease( fileURLData );
CantCopyFileURLFromPasteboard:
CantGetPasteboardIdentifier:
return fileURL;
}
//------------------------------------------------------------------------------
// CreateFirstFileURLFromDragEvent
//------------------------------------------------------------------------------
//
static CFURLRef CreateFirstFileURLFromDragEvent(
EventRef inEvent )
{
PasteboardRef pasteboard;
CFURLRef fileURL = NULL;
pasteboard = GetPasteboardFromDragEvent( inEvent );
require( pasteboard != NULL, CantGetDragPasteboard );
fileURL = CreateFileURLFromPasteboard( pasteboard, 1 );
CantGetDragPasteboard:
return fileURL;
}
//------------------------------------------------------------------------------
// ImageViewDragEnter
//------------------------------------------------------------------------------
//
static OSStatus ImageViewDragEnter(
EventRef inEvent)
{
CFURLRef fileURL = CreateFirstFileURLFromDragEvent( inEvent );
Boolean wouldAccept = (fileURL != NULL); // accept the drag if it contains an image file URL
// let the HIView drag apparatus know that we want to continue receiving drag messages
verify_noerr( SetEventParameter( inEvent, kEventParamControlWouldAcceptDrop, typeBoolean, sizeof( Boolean ), &wouldAccept ) );
if ( fileURL != NULL )
CFRelease( fileURL );
return noErr;
}
OSStatus ImageViewDragReceive( EventRef event, CustomCursorStruct *customCursor, HIViewRef imageView )
{
PasteboardRef pasteboard;
CFURLRef fileURL = NULL;
CursorRef newCursor;
pasteboard = GetPasteboardFromDragEvent( event );
require( pasteboard != NULL, CantGetDragPasteboard );
fileURL = CreateFirstFileURLFromDragEvent( event );
if ( fileURL )
{
CGImageRef theImage;
newCursor = SetCursorFromCFURL( fileURL );
if (newCursor)
{
ReleaseCocoaCursor( customCursor->cursor );
customCursor->cursor = newCursor;
SetCocoaCursor( newCursor );
theImage = CGImageCreateFromURL( fileURL );
HIImageViewSetImage( imageView, theImage );
if ( theImage )
CFRelease( theImage );
}
CFRelease( fileURL );
}
CantGetDragPasteboard:
return noErr;
}
CursorRef SetCursorFromCFURL( CFURLRef urlToImage )
{
CGImageRef cgImageRef = CGImageCreateFromURL( urlToImage );
CursorRef newCursor = NULL;
require( cgImageRef != NULL, CantCreateImage );
newCursor = CreateCocoaCursor( cgImageRef, 48, 16 );
if ( cgImageRef )
CFRelease( cgImageRef );
CantCreateImage:
return( (CursorRef)newCursor );
}
static 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;
}
return( status );
}
// The tracking handler to manage the cursor as it rolls over our HIImageView.
static OSStatus HIImageViewTrackingHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *inUserData )
{
CustomCursorStruct *customCursor;
OSStatus status = eventNotHandledErr;
UInt32 eventKind = GetEventKind( inEvent );
UInt32 eventClass = GetEventClass( inEvent );
status = GetControlProperty( (ControlRef) inUserData, 'Curs', 'Cstm', sizeof(CustomCursorStruct*), NULL, &customCursor ); // For convenience we store the pointer to the cursor
require_noerr( status, Bail );
switch ( eventClass )
{
case kEventClassControl:
switch ( eventKind )
{
case kEventControlTrackingAreaEntered:
SetCocoaCursor( customCursor->cursor );
break;
case kEventControlTrackingAreaExited:
SetThemeCursor( kThemeArrowCursor );
break;
case kEventControlDispose:
ReleaseCocoaCursor( customCursor->cursor );
DisposePtr( (Ptr) customCursor );
break;
case kEventControlDragEnter:
status = ImageViewDragEnter( inEvent );
break;
case kEventControlDragReceive:
status = ImageViewDragReceive( inEvent, customCursor, (ControlRef) inUserData );
break;
}
break;
}
Bail:
return( status );
}
static OSStatus DoNewWindow( WindowRef *outWindow )
{
OSStatus status;
CustomCursorStruct *customCursor;
static EventHandlerUPP windowEventHandlerUPP;
const EventTypeSpec windowEvents[] = { { kEventClassCommand, kEventCommandProcess } };
WindowRef window = NULL;
// Create a window. "MainWindow" is the name of the window object. This name is set in InterfaceBuilder when the nib is created.
status = CreateWindowFromNib( gMainNibRef, 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 );
{
HIViewRef hiImageView;
HIViewTrackingAreaRef dummyTrackingArea; // The tracking area is disposed automatically with the view, so we don't need to keep it in this case
CGImageRef cgImageRef = NULL;
const EventTypeSpec ourEvents[] = { { kEventClassControl, kEventControlTrackingAreaEntered },
{ kEventClassControl, kEventControlTrackingAreaExited },
{ kEventClassControl, kEventControlDispose },
{ kEventClassControl, kEventControlDragReceive },
{ kEventClassControl, kEventControlDragEnter },
};
CFURLRef cfURL = CFBundleCopyResourcesDirectoryURL( CFBundleGetMainBundle() );
CFURLRef fullUrlRef = CFURLCreateCopyAppendingPathComponent( NULL, cfURL, CFSTR("BlueArrow.png"), false );
CFRelease( cfURL );
cgImageRef = CGImageCreateFromURL( fullUrlRef );
status = HIViewFindBySigAndID( HIViewGetRoot(window), 'HIiv', 0, &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 = HIImageViewSetScaleToFit( hiImageView, true ); 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
customCursor = (CustomCursorStruct*) NewPtrClear( sizeof(CustomCursorStruct) );
SetControlProperty( hiImageView,'Curs','Cstm', sizeof(CustomCursorStruct*), &customCursor ); // For convenience we store the pointer to the cursor in the window's RefCon
status = HIViewNewTrackingArea( hiImageView, NULL, 0, &dummyTrackingArea);
customCursor->cursor = SetCursorFromCFURL( fullUrlRef );
CFRelease( fullUrlRef );
status = InstallControlEventHandler( hiImageView, HIImageViewTrackingHandler, GetEventTypeCount(ourEvents), ourEvents, hiImageView, NULL );
status = SetAutomaticControlDragTrackingEnabledForWindow( window, true );
status = SetControlDragTrackingEnabled( hiImageView, true );
Bail:
if ( cgImageRef != NULL ) CFRelease( cgImageRef ); else status = -1;
}
ShowWindow( window );
CantInstallWindowEventHandler:
CantCreateWindow:
if ( outWindow != NULL ) *outWindow = window;
return( status );
}
static OSStatus MainWindowEventHandler( EventHandlerCallRef nextHandler, EventRef inEvent, void *inUserData )
{
#pragma unused ( inCallRef )
HICommand command;
HIViewRef myButton;
Boolean isButtonDefault;
WindowRef window = (WindowRef) inUserData;
OSStatus status = eventNotHandledErr;
UInt32 eventKind = GetEventKind( inEvent );
UInt32 eventClass = GetEventClass( inEvent );
switch ( eventClass )
{
case kEventClassCommand:
if ( eventKind == kEventCommandProcess )
{
GetEventParameter( inEvent, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &command );
if ( command.commandID == 'Curs' ) // Our button was clicked
{
status = HIViewFindBySigAndID( HIViewGetRoot(window), 'Curs', 0, &myButton ); require_noerr( status, Bail );
status = GetControlData( myButton, kControlEntireControl, kControlPushButtonDefaultTag, sizeof(Boolean), &isButtonDefault, NULL ); require_noerr( status, Bail );
if ( isButtonDefault )
{
// If the button was default, show the cursor and make the button non-default
ShowCocoaCursor();
SetControlTitleWithCFString( myButton, CFSTR( "Hide Cursor" ));
SetWindowDefaultButton( window, NULL );
}
else
{
// We hit the hide cursor button. Hide the cursor and make the button default so that the user can hit return
// to show the cursor again. This is only useful as sample code, it's not good UI to hide the cursor generally.
HideCocoaCursor();
SetControlTitleWithCFString( myButton, CFSTR( "Show Cursor" ));
SetWindowDefaultButton( window, myButton );
}
}
}
break;
}
Bail:
return( status );
}
static OSStatus HIViewFindBySigAndID( HIViewRef inStartView, OSType signature, SInt32 id, HIViewRef *outControl )
{
HIViewID hiViewID = { signature, id };
return( HIViewFindByID( inStartView, hiViewID, outControl ) );
}
</pre>
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