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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<!-- BEGIN META TAG INFO -->
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="home" href="http://developer.apple.com/">
<link rel="find" href="http://developer.apple.com/search/">
<link rel="stylesheet" type="text/css" href="../../documentation/css/adcstyle.css" title="fonts">
<script language="JavaScript" src="../../documentation/js/adc.js" type="text/javascript"></script>
<!-- END META TAG INFO -->
<!-- BEGIN TITLE -->
<title>ImageBrowserView - /ImageBrowser/ImageBrowserView.c</title>
<!-- END TITLE -->
<script language="JavaScript">
function JumpToNewPage() {
window.location=document.scpopupmenu.gotop.value;
return true;
}
</script>
</head>
<!-- BEGIN BODY OPEN -->
<body>
<!--END BODY OPEN -->
<!-- START CENTER OPEN -->
<center>
<!-- END CENTER OPEN -->
<!-- BEGIN LOGO AND SEARCH -->
<!--#include virtual="/includes/adcnavbar"-->
<!-- END LOGO AND SEARCH -->
<!-- START BREADCRUMB -->
<div id="breadcrumb">
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr>
<td scope="row"><img width="340" height="10" src="images/1dot.gif" alt=""></td>
<td><img width="340" height="10" src="images/1dot.gif" alt=""></td>
</tr>
<tr valign="middle">
<td align="left" colspan="2">
<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/Carbon/index.html">Carbon</a> > <a href="../../samplecode/Carbon/idxHumanInterfaceToolbox-date.html">Human Interface Toolbox</a> > <A HREF="javascript:location.replace('index.html');">ImageBrowserView</A> >
</td>
</tr>
<tr>
<td colspan="2" scope="row"><img width="680" height="35" src="images/1dot.gif" alt=""></td>
</tr>
</table>
</div>
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<!-- START MAIN CONTENT -->
<!-- START TITLE GRAPHIC AND INTRO-->
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr align="left" valign="top">
<td><h1><div id="pagehead">ImageBrowserView</div></h1></td>
</tr>
</table>
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<td id="scdetails">
<h2>/ImageBrowser/ImageBrowserView.c</h2>
<form name="scpopupmenu" onSubmit="return false;" method=post>
<p><strong>View Source Code:</strong>
<select name="gotop" onChange="JumpToNewPage();" style="width:340px"><option selected value="ingnore">Select File</option>
<option value="listing1.html">/HIFramework/HIFramework.h</option>
<option value="listing2.html">/HIFramework/TCarbonEvent.cp</option>
<option value="listing3.html">/HIFramework/TCarbonEvent.h</option>
<option value="listing4.html">/HIFramework/TEventHandler.cp</option>
<option value="listing5.html">/HIFramework/TEventHandler.h</option>
<option value="listing6.html">/HIFramework/TObject.cp</option>
<option value="listing7.html">/HIFramework/TObject.h</option>
<option value="listing8.html">/HIFramework/TRect.cp</option>
<option value="listing9.html">/HIFramework/TRect.h</option>
<option value="listing10.html">/HIFramework/TView.cp</option>
<option value="listing11.html">/HIFramework/TView.h</option>
<option value="listing12.html">/ImageBrowser/ImageBrowserView.c</option>
<option value="listing13.html">/ImageBrowser/ImageBrowserView.h</option>
<option value="listing14.html">/ImageBrowser/main.c</option>
<option value="listing15.html">/ImageBrowser/TImageBrowserView.cp</option>
<option value="listing16.html">/ImageBrowser/TImageBrowserView.h</option></select>
</p>
</form>
<p><strong><a href="ImageBrowserView.zip">Download Sample</a></strong> (“ImageBrowserView.zip”, 104.7K)<BR>
<strong><a href="ImageBrowserView.dmg">Download Sample</a></strong> (“ImageBrowserView.dmg”, 155.9K)</p>
<!--
<p><strong><a href="#">Download Sample</a></strong> (“filename.sit”, 500K)</p>
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<img height="1" width="680" src="images/1dot_919699.gif" alt=""><br>
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<!--googleon: index -->
<pre class="sourcecodebox">/*
File: ImageBrowserView.c
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 "ImageBrowserView.h"
/*
To do:
implement copy/paste
implement kEventCommandUpdateStatus if control is focused
in ImageBrowserViewTrack, if mouse is in image, use WaitMouseMoved or TrackMouseLocation and start a drag if appropriate.
*/
//------------------------------------------------------------------------------
// types
//------------------------------------------------------------------------------
//
typedef struct
{
HIViewRef view;
CFMutableArrayRef imageURLs;
CFIndex imageIndex;
bool trackingDrag;
bool mouseInView;
HIViewTrackingAreaRef trackingArea;
HIViewPartCode currentFocusPart;
CGImageRef imageCache;
CGImageRef imageCacheDisabled;
CFIndex imageCacheIndex;
} ImageBrowserViewData;
//------------------------------------------------------------------------------
// constants
//------------------------------------------------------------------------------
//
const float kImageMargin = 2;
const float kButtonSize = 24;
const float kButtonMargin = 32;
const float kButtonPad = 4;
enum // view parts
{
kImagePart = 1,
kBrowseBackPart,
kBrowseForwardPart,
kDeleteImagePart
};
#define kImageURLsArchiveKey CFSTR("ImageURLsKey")
#define kImageIndexArchiveKey CFSTR("ImageIndexKey")
#pragma mark -
#pragma mark Helper Routines
//------------------------------------------------------------------------------
// GetPartFrame
//------------------------------------------------------------------------------
//
static HIRect GetPartFrame(
HIViewRef inView,
HIViewPartCode inPart )
{
HIRect viewBounds, partFrame;
// get the bounds for the entire view
verify_noerr( HIViewGetBounds( inView, &viewBounds ) );
// generate the frame for the requested part
switch ( inPart )
{
case kBrowseBackPart:
partFrame.origin.x = viewBounds.size.width/2 - kButtonSize;
partFrame.origin.y = viewBounds.size.height - kButtonSize - kButtonMargin;
partFrame.size.width = partFrame.size.height = kButtonSize;
break;
case kBrowseForwardPart:
partFrame.origin.x = viewBounds.size.width/2;
partFrame.origin.y = viewBounds.size.height - kButtonSize - kButtonMargin;
partFrame.size.width = partFrame.size.height = kButtonSize;
break;
case kDeleteImagePart:
partFrame.origin.x = viewBounds.size.width - kButtonSize - kButtonMargin;
partFrame.origin.y = viewBounds.size.height - kButtonSize - kButtonMargin;
partFrame.size.width = partFrame.size.height = kButtonSize;
break;
case kImagePart:
partFrame = CGRectInset( viewBounds, 1, 1 );
break;
}
return partFrame;
}
//------------------------------------------------------------------------------
// IsPartAvailable
//------------------------------------------------------------------------------
// Returns whether a particular part is currently available, based on the
// contents of the view.
//
static Boolean
IsPartAvailable(
ImageBrowserViewData* inData,
HIViewPartCode inPart )
{
Boolean enabled = true;
switch ( inPart )
{
case kImagePart:
enabled = HIViewIsEnabled( inData->view, NULL );
break;
case kBrowseBackPart:
enabled = inData->imageIndex > 0;
break;
case kBrowseForwardPart:
enabled = inData->imageIndex < ( CFArrayGetCount( inData->imageURLs ) - 1 );
break;
case kDeleteImagePart:
enabled = CFArrayGetCount( inData->imageURLs ) > 0;
break;
}
return enabled;
}
//------------------------------------------------------------------------------
// 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;
}
//------------------------------------------------------------------------------
// 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;
}
//------------------------------------------------------------------------------
// 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;
}
//------------------------------------------------------------------------------
// InvalidateImageCache
//------------------------------------------------------------------------------
//
static void
InvalidateImageCache(
ImageBrowserViewData* inData )
{
if ( inData->imageCache != NULL )
{
CFRelease( inData->imageCache );
inData->imageCache = NULL;
}
if ( inData->imageCacheDisabled != NULL )
{
CFRelease( inData->imageCacheDisabled );
inData->imageCacheDisabled = NULL;
}
}
//------------------------------------------------------------------------------
// PreviousImage
//------------------------------------------------------------------------------
//
static void PreviousImage(
ImageBrowserViewData* inData )
{
if ( inData->imageIndex > 0 )
{
inData->imageIndex--; // decrement the image index if possible
// if the focused part is no longer available, advance the focus to the next part
if ( !IsPartAvailable( inData, inData->currentFocusPart ) )
SetKeyboardFocus( HIViewGetWindow( inData->view ), inData->view, kControlFocusNextPart );
// invalidate due to index change
verify_noerr( HIViewSetNeedsDisplay( inData->view, true ) );
}
}
//------------------------------------------------------------------------------
// NextImage
//------------------------------------------------------------------------------
//
static void NextImage(
ImageBrowserViewData* inData )
{
if ( inData->imageIndex < CFArrayGetCount( inData->imageURLs ) - 1 )
{
inData->imageIndex++; // increment the image index if possible
// if the focused part is no longer available, advance the focus to the previous part
if ( !IsPartAvailable( inData, inData->currentFocusPart ) )
SetKeyboardFocus( HIViewGetWindow( inData->view ), inData->view, kControlFocusPrevPart );
// invalidate due to index change
verify_noerr( HIViewSetNeedsDisplay( inData->view, true ) );
}
}
//------------------------------------------------------------------------------
// AddImage
//------------------------------------------------------------------------------
//
static void AddImage(
CFURLRef inFileURL,
ImageBrowserViewData* inData )
{
//
// If we already have images in the array, then put our new image after the current image index.
// If we have no images in the array, then imageIndex is zero, and that's the index for the new image.
//
if ( CFArrayGetCount( inData->imageURLs ) > 0 )
inData->imageIndex++;
CFArrayInsertValueAtIndex( inData->imageURLs, inData->imageIndex, inFileURL );
// invalidate due to index change
InvalidateImageCache( inData );
verify_noerr( HIViewSetNeedsDisplay( inData->view, true ) );
}
//------------------------------------------------------------------------------
// DeleteCurrentImage
//------------------------------------------------------------------------------
//
static void DeleteCurrentImage(
ImageBrowserViewData* inData )
{
if ( CFArrayGetCount( inData->imageURLs ) > 0 )
{
CFArrayRemoveValueAtIndex( inData->imageURLs, inData->imageIndex );
if ( inData->imageIndex > 0 )
inData->imageIndex--;
// if the focused part is no longer available, set focus to the image part
if ( !IsPartAvailable( inData, inData->currentFocusPart ) )
SetKeyboardFocus( HIViewGetWindow( inData->view ), inData->view, kImagePart );
// invalidate due to index change
InvalidateImageCache( inData );
verify_noerr( HIViewSetNeedsDisplay( inData->view, true ) );
}
}
//------------------------------------------------------------------------------
// ReleaseImageBits
//------------------------------------------------------------------------------
//
static void
ReleaseImageBits( void *info, const void *data, size_t size )
{
free( (void*) data );
}
//-----------------------------------------------------------------------------
// ConvertImageToBitmapImage
//-----------------------------------------------------------------------------
// Draws an image into a bitmap context and replaces the original image with
// a new image created from the bitmap. This greatly improves performance when
// the original image potentially needs to be decoded from source data in order
// to be drawn.
//
static void
ConvertImageToBitmapImage( CGImageRef* ioImage )
{
HIRect bounds;
CGImageRef image = NULL;
size_t bytesPerRow;
size_t size;
size_t height, width;
void * ptr;
CGContextRef context;
CGColorSpaceRef colorSpace;
CGDataProviderRef provider;
bounds.origin.x = bounds.origin.y = 0;
bounds.size.width = CGImageGetWidth( *ioImage );
bounds.size.height = CGImageGetHeight( *ioImage );
height = (size_t)ceil( bounds.size.height );
width = (size_t)ceil( bounds.size.width );
bytesPerRow = ( ( width * 8 * 4 + 7 ) / 8 );
size = bytesPerRow * height;
ptr = calloc( 1, size );
require( ptr != NULL, CantAllocateImageTemp );
colorSpace = CGColorSpaceCreateDeviceRGB();
context = CGBitmapContextCreate( ptr, width, height, 8, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedFirst );
require( context != NULL, CouldntCreateContext );
CGContextDrawImage( context, bounds, *ioImage );
CGContextRelease( context );
// Create a CGImage from our offscreen.
provider = CGDataProviderCreateWithData( 0, ptr, size, ReleaseImageBits );
image = CGImageCreate( width, height, 8, 32, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedFirst,
provider, NULL, false, kCGRenderingIntentDefault );
CGColorSpaceRelease( colorSpace );
CGDataProviderRelease( provider );
CFRelease( *ioImage );
*ioImage = image;
CantAllocateImageTemp:
CouldntCreateContext:
return;
}
//------------------------------------------------------------------------------
// ConvertGlobalToLocalPoint
//------------------------------------------------------------------------------
//
static HIPoint* ConvertGlobalToLocalPoint(
ImageBrowserViewData* inData,
const HIPoint* inPoint,
HIPoint* outPoint )
{
HIPoint hiPoint = *inPoint;
Rect bounds;
check( inData != NULL );
check( inData->view != NULL );
check( inPoint != NULL );
check( outPoint != NULL );
// use HIPointConvert if available
if ( HIPointConvert != NULL )
{
*outPoint = *inPoint;
HIPointConvert( outPoint, kHICoordSpace72DPIGlobal, NULL, kHICoordSpaceView, inData->view );
}
else
{
// default
outPoint->x = outPoint->y = 0;
// convert global to local window coordinates
GetWindowBounds( HIViewGetWindow( inData->view ), kWindowStructureRgn, &bounds );
hiPoint.x -= bounds.left;
hiPoint.y -= bounds.top;
// convert from window to view
if ( HIViewConvertPoint( &hiPoint, NULL, inData->view ) == noErr )
*outPoint = hiPoint;
}
return outPoint;
}
//------------------------------------------------------------------------------
// ConvertLocalToGlobalPoint
//------------------------------------------------------------------------------
//
static HIPoint* ConvertLocalToGlobalPoint(
ImageBrowserViewData* inData,
const HIPoint* inPoint,
HIPoint* outPoint )
{
HIPoint hiPoint = *inPoint;
check( inData != NULL );
check( inData->view != NULL );
check( inPoint != NULL );
check( outPoint != NULL );
// use HIPointConvert if available
if ( HIPointConvert != NULL )
{
*outPoint = *inPoint;
HIPointConvert( outPoint, kHICoordSpaceView, inData->view, kHICoordSpace72DPIGlobal, NULL );
}
else
{
// default
outPoint->x = outPoint->y = 0;
// convert view to window
if ( HIViewConvertPoint( &hiPoint, inData->view, NULL ) == noErr )
{
Rect bounds;
GetWindowBounds( HIViewGetWindow( inData->view ), kWindowStructureRgn, &bounds );
// convert to global
outPoint->x = hiPoint.x + bounds.left;
outPoint->y = hiPoint.y + bounds.top;
}
}
return outPoint;
}
//------------------------------------------------------------------------------
// GetViewPart
//------------------------------------------------------------------------------
// Returns the part corresponding to the given point in local coordinates
//
static HIViewPartCode GetViewPart(
ImageBrowserViewData* inData,
HIPoint* inPoint )
{
HIViewPartCode part = kDeleteImagePart;
do // test which part the mouse is within cycling backwards from smallest to largest
{
if ( CGRectContainsPoint( GetPartFrame( inData->view, part ), *inPoint ) )
break;
}
while ( part-- > kImagePart );
return part;
}
#pragma mark -
#pragma mark Event Handlers
//------------------------------------------------------------------------------
// ImageBrowserViewConstruct
//------------------------------------------------------------------------------
//
static OSStatus ImageBrowserViewConstruct(
EventRef inEvent )
{
OSStatus err = noErr;
ImageBrowserViewData* data;
// don't CallNextEventHandler!
data = (ImageBrowserViewData*)malloc( sizeof( ImageBrowserViewData ) );
require_action( data != NULL, CantMalloc, err = memFullErr );
verify_noerr( GetEventParameter( inEvent, kEventParamHIObjectInstance, typeHIObjectRef, NULL, sizeof( HIObjectRef ),
NULL, (HIObjectRef*)&data->view ) );
// set the userData that will be used with all subsequent eventHandler calls
verify_noerr( SetEventParameter( inEvent, kEventParamHIObjectInstance, typeVoidPtr, sizeof( ImageBrowserViewData* ), &data ) );
CantMalloc:
return err;
}
//------------------------------------------------------------------------------
// ImageBrowserViewDestruct
//------------------------------------------------------------------------------
//
static OSStatus ImageBrowserViewDestruct(
EventRef inEvent,
ImageBrowserViewData* inData )
{
// free the instance data
if ( inData != NULL )
{
if ( inData->imageURLs != NULL )
CFRelease( inData->imageURLs );
if ( inData->trackingArea != NULL )
verify_noerr( HIViewDisposeTrackingArea( inData->trackingArea ) );
InvalidateImageCache( inData );
free( inData );
}
return noErr;
}
//------------------------------------------------------------------------------
// ImageBrowserViewInitialize
//------------------------------------------------------------------------------
//
static OSStatus ImageBrowserViewInitialize(
EventHandlerCallRef inCallRef,
EventRef inEvent,
ImageBrowserViewData* inData )
{
OSStatus err = noErr;
HIArchiveRef decoder = NULL;
CFArrayRef imageURLs = NULL;
CFStringRef imagePath;
// allow the superclass to initialize itself
err = CallNextEventHandler( inCallRef, inEvent );
require_noerr( err, CantInitializeSuperclass );
// look for the optional HIArchive decoder in the event
GetEventParameter( inEvent, kEventParamHIArchive, typeCFTypeRef, NULL, sizeof( HIArchiveRef ), NULL, &decoder );
// defult to the first image
inData->imageIndex = 0;
if ( decoder != NULL ) // if we're unarchiving, initialize from the decoder ...
{
// decode our persistant state
err = HIArchiveCopyDecodedCFType( decoder, kImageURLsArchiveKey, (CFTypeRef*)&imageURLs );
require_noerr( err, CantDecodeImageURLs );
err = HIArchiveDecodeNumber( decoder, kImageIndexArchiveKey, kCFNumberCFIndexType, &(inData->imageIndex) );
require_noerr( err, CantDecodeImageIndex );
}
else // ... otherwise initialize as normal
{
// extract the optional image URLs from the initialization event
GetEventParameter( inEvent, kEventParamImageURLArray, typeCFTypeRef, NULL, sizeof( CFArrayRef ), NULL, &imageURLs );
}
// create a mutable version of the image URLs array for later modification
if ( imageURLs != NULL )
inData->imageURLs = CFArrayCreateMutableCopy( kCFAllocatorDefault, 0, imageURLs );
else
inData->imageURLs = CFArrayCreateMutable( kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks );
require_action( inData->imageURLs != NULL, CantCreateImageURLArray, err = coreFoundationUnknownErr );
// extract the optional image path from the initialization event
if ( GetEventParameter( inEvent, kEventParamImageURL, typeCFStringRef, NULL, sizeof( CFStringRef ), NULL, &imagePath ) == noErr )
{
CFURLRef imageURL = CFURLCreateWithFileSystemPath( kCFAllocatorDefault, imagePath, kCFURLPOSIXPathStyle, false );
require_action( imageURL != NULL, CantCreateImageURL, err = coreFoundationUnknownErr );
CFArrayAppendValue( inData->imageURLs, imageURL );
CFRelease( imageURL );
}
// we're not tracking any drags by default
inData->trackingDrag = false;
// install a tracking area on the entire view to implement a mouse over effect
verify_noerr( HIViewNewTrackingArea( inData->view, NULL, 0, &(inData->trackingArea) ) );
// the mouse is not in the view by default
inData->mouseInView = false;
// default to a non-focused state
inData->currentFocusPart = kHIViewFocusNoPart;
// we have no cached image
inData->imageCache = NULL;
inData->imageCacheDisabled = NULL;
inData->imageCacheIndex = -1;
// allow the view to be archived
verify_noerr( HIObjectSetArchivingIgnored( (HIObjectRef)inData->view, false ) );
// let HIToolbox know that we're an opaque view for performance
verify_noerr( HIViewChangeFeatures( inData->view, kHIViewFeatureIsOpaque, 0 ) );
CantCreateImageURL:
CantCreateImageURLArray:
CantDecodeImageIndex:
CantDecodeImageURLs:
InitBoundsParameterMissing:
CantInitializeSuperclass:
return err;
}
//------------------------------------------------------------------------------
// ImageBrowserViewEncode
//------------------------------------------------------------------------------
//
static OSStatus ImageBrowserViewEncode(
EventHandlerCallRef inCallRef,
EventRef inEvent,
ImageBrowserViewData* inData )
{
OSStatus err;
HIArchiveRef encoder;
// allow the superclass to encode itself
err = CallNextEventHandler( inCallRef, inEvent );
require_noerr( err, CantEncodeSuperclass );
// get the HIArchive encoder from the event
verify_noerr( GetEventParameter( inEvent, kEventParamHIArchive, typeCFTypeRef, NULL, sizeof( HIArchiveRef ), NULL, &encoder ) );
// encode our persistant state
err = HIArchiveEncodeCFType( encoder, kImageURLsArchiveKey, inData->imageURLs );
require_noerr( err, CantEncodeImageURLs );
err = HIArchiveEncodeNumber( encoder, kImageIndexArchiveKey, kCFNumberCFIndexType, &(inData->imageIndex) );
require_noerr( err, CantEncodeImageIndex );
CantEncodeImageIndex:
CantEncodeImageURLs:
CantEncodeSuperclass:
return err;
}
//------------------------------------------------------------------------------
// ImageBrowserViewDraw
//------------------------------------------------------------------------------
//
static OSStatus ImageBrowserViewDraw(
EventRef inEvent,
ImageBrowserViewData* inData )
{
OSStatus err = noErr;
HIRect bounds;
CGContextRef context;
CFIndex imageURLCount = CFArrayGetCount( inData->imageURLs );
verify_noerr( GetEventParameter( inEvent, kEventParamCGContextRef, typeCGContextRef, NULL, sizeof( CGContextRef ),
NULL, &context ) );
verify_noerr( HIViewGetBounds( inData->view, &bounds ) );
// draw a black background/frame
CGContextSetRGBFillColor( context, 0, 0, 0, 1 );
CGContextFillRect( context, bounds );
// draw the current image if it exists
if ( imageURLCount > 0 )
{
CGImageSourceRef imageSource;
HIRect insetBounds = CGRectInset( bounds, kImageMargin, kImageMargin );
HIRect imageBounds = insetBounds;
float scale;
CGImageRef image;
if ( inData->imageCacheIndex != inData->imageIndex )
InvalidateImageCache( inData );
// don't rerender the image if the cache is still valid
if ( inData->imageCache == NULL )
{
CFURLRef imageURL = (CFURLRef)CFArrayGetValueAtIndex( inData->imageURLs, inData->imageIndex );
// dynamically load and cache the image from the URL with ImageIO as necessary
imageSource = CGImageSourceCreateWithURL( imageURL, NULL );
require_action( imageSource != NULL, CantCreateImageSource, err = coreFoundationUnknownErr );
inData->imageCache = CGImageSourceCreateImageAtIndex( imageSource, 0, NULL );
CFRelease( imageSource );
require_action( inData->imageCache != NULL, CantCreateImage, err = coreFoundationUnknownErr );
// cache the image data in a bitmap context to improve drawing performance
ConvertImageToBitmapImage( &inData->imageCache );
// create a disabled version of the image
HICreateTransformedCGImage( inData->imageCache, kHITransformDisabled, &inData->imageCacheDisabled );
inData->imageCacheIndex = inData->imageIndex;
}
imageBounds.size.width = CGImageGetWidth( inData->imageCache );
imageBounds.size.height = CGImageGetHeight( inData->imageCache );
// determine image scale factor based on relative sizes of view and image bounds
if ( imageBounds.size.width/insetBounds.size.width > imageBounds.size.height/insetBounds.size.height )
scale = insetBounds.size.width/imageBounds.size.width;
else
scale = insetBounds.size.height/imageBounds.size.height;
// scale and center the image
imageBounds.size.width *= scale;
imageBounds.size.height *= scale;
imageBounds.origin.x += (insetBounds.size.width - imageBounds.size.width )/2;
imageBounds.origin.y += (insetBounds.size.height - imageBounds.size.height )/2;
// determine whether to use the regular or disabled image
if ( !(HIViewIsEnabled( inData->view, NULL ) && HIViewIsActive( inData->view, NULL )) &&
inData->imageCacheDisabled != NULL )
image = inData->imageCacheDisabled;
else
image = inData->imageCache;
// draw the image
verify_noerr( HIViewDrawCGImage( context, &imageBounds, image ) );
CantCreateImageSource:
CantCreateImage:
;
}
// draw a drag hilight if necessary
if ( inData->trackingDrag )
{
RGBColor dragColor;
// draw with the appropriate theme brush
verify_noerr( GetThemeBrushAsColor( kThemeBrushDragHilite, 32, true, &dragColor ) );
CGContextSetRGBStrokeColor( context, (float)dragColor.red/65535, (float)dragColor.green/65535,
(float)dragColor.blue/65535, 1 );
CGContextSetLineWidth( context, 5 );
CGContextStrokeRect( context, GetPartFrame( inData->view, kImagePart ) );
}
// draw the currently focused area if necessary
if ( inData->currentFocusPart != kHIViewFocusNoPart && HIViewIsEnabled( inData->view, NULL ) &&
HIViewIsActive( inData->view, NULL ) )
{
RGBColor hiliteColor;
HIRect focusFrame = GetPartFrame( inData->view, inData->currentFocusPart );
// draw with the appropriate theme brush
verify_noerr( GetThemeBrushAsColor( kThemeBrushFocusHighlight, 32, true, &hiliteColor ) );
CGContextSetRGBStrokeColor( context, (float)hiliteColor.red/65535, (float)hiliteColor.green/65535,
(float)hiliteColor.blue/65535, 1 );
CGContextSetLineWidth( context, (inData->currentFocusPart == kImagePart) ? 5 : 3 ); // thicker for the image part
CGContextStrokeRect( context, focusFrame );
}
// only draw the browse buttons when we're enablde, active and the mouse button is inside the view or they're focused
if ( HIViewIsEnabled( inData->view, NULL ) && HIViewIsActive( inData->view, NULL ) &&
(inData->mouseInView || inData->currentFocusPart == kBrowseBackPart ||
inData->currentFocusPart == kBrowseForwardPart || inData->currentFocusPart == kDeleteImagePart) )
{
HISize shadowOffset = { 0, -2 };
HIRect frame;
HIViewPartCode hilite = GetControlHilite( inData->view );
// add a little shadow to the buttons for effect
CGContextSetShadow( context, shadowOffset, 2 );
// draw the browse back button
frame = GetPartFrame( inData->view, kBrowseBackPart );
CGContextBeginPath( context );
CGContextMoveToPoint( context, frame.origin.x + frame.size.width - kButtonPad, frame.origin.y );
CGContextAddLineToPoint( context, frame.origin.x, frame.origin.y + kButtonSize/2 );
CGContextAddLineToPoint( context, frame.origin.x + frame.size.width - kButtonPad, frame.origin.y + kButtonSize );
CGContextAddLineToPoint( context, frame.origin.x + frame.size.width - kButtonPad, frame.origin.y );
CGContextClosePath( context );