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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>
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<title>MouseTracking - /MouseTrackingView-2.c</title>
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<td scope="row"><img width="340" height="10" src="images/1dot.gif" alt=""></td>
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</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/idxGraphicsImaging-date.html">Graphics & Imaging</a> > <A HREF="javascript:location.replace('index.html');">MouseTracking</A> >
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<table width="680" border="0" cellpadding="0" cellspacing="0">
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<td><h1><div id="pagehead">MouseTracking</div></h1></td>
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<h2>/MouseTrackingView-2.c</h2>
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<p><strong>View Source Code:</strong>
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<option value="listing1.html">/main.c</option>
<option value="listing2.html">/MouseTrackingView-2.c</option>
<option value="listing3.html">/MouseTrackingView-CG.c</option>
<option value="listing4.html">/MouseTrackingView-QD.c</option>
<option value="listing5.html">/MouseTrackingView.h</option></select>
</p>
</form>
<p><strong><a href="MouseTracking.zip">Download Sample</a></strong> (“MouseTracking.zip”, 119.8K)<BR>
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<!--googleon: index -->
<pre class="sourcecodebox">/*
File: MouseTrackingView-2.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
*/
/****************************************************************************************************
* And this is the version with the "bells and whistles", to illustrate the following points:
* - Use the sketched path as clip path (vs. the QD clipRgn)
* - Use a 1x1 bitmap context for hit testing on the clipped portion (vs. PtInRgn)
* - Drag the clipped image portion around, with transparency (vs. GWorlds, CopyBits, CopyDeepMask etc.)
* - Use a maskedImage to remove the white background (vs. CopyBits, SearchProcs, BitmapToRegion etc.)
****************************************************************************************************/
#include "MouseTrackingView.h"
extern CGImageRef LoadImageFromMainBundle(CFStringRef imageName);
// A pointer to this per-view storage gets passed to the EventHandler as "userData".
struct MTViewData {
HIViewRef theView;
CGImageRef theImage;
CGImageRef maskedImage;
CGMutablePathRef thePath;
HIPoint selectionOffset;
Boolean pathBuildingDone;
Boolean hitSelection;
Boolean selectionMoveDone;
};
typedef struct MTViewData MTViewData;
//-----------------------------------------------------------------------------------
// Two alternatives for "CreateMaskedImage", both available in 10.4 and later only:
// a) Use CGImageCreateWithMaskingColors
// b) Draw image into grayLevel bitmap context to be used as imageMask
// and use CGImageCreateWithMask.
// Prior to 10.4, the mask would have to be worked into the alpha channel of the image.
#if 0
static CGImageRef CreateMaskedImage(CGImageRef image)
{
const float maskingMinMax[] = { 220, 255, 220, 255, 220, 255 };
CGImageRef maskedImage = CGImageCreateWithMaskingColors(image, maskingMinMax);
return maskedImage;
}
#else
static void FreePixelData(void *info, const void *data, size_t size)
{
free((void*)data);
}
static void FixOpaqueness(uint8_t* p, size_t n)
{
const uint8_t kCutOff = 220;
while (n-- > 0)
{
uint8_t v = *p;
if (v < kCutOff)
v = 0;
*p++ = v;
}
}
static CGImageRef CreateMaskedImage(CGImageRef image)
{
// Draw the image into a grayLevel bitmap context to produce a mask
size_t width = CGImageGetWidth(image);
size_t height = CGImageGetHeight(image);
size_t dataSize = width * height; // 1 byte per pixel
void* data = malloc(dataSize);
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceGray();
// Ironically, due to a bug in CGImageCreateWithMask, you cannot use
// CGColorSpaceCreateWithName(kCGColorSpaceGenericGray) at this point!
CGContextRef ctx = CGBitmapContextCreate(data, width, height, 8, width, colorspace, kCGImageAlphaNone);
CGContextDrawImage(ctx, CGRectMake(0, 0, width, height), image);
CGContextRelease(ctx);
FixOpaqueness(data, dataSize);
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, data, dataSize, FreePixelData);
const float decode[] = { 1.0, 0.0 }; // need to inverse gray levels
CGImageRef imageMask = CGImageCreate(width, height, 8, 8, width, colorspace, kCGImageAlphaNone, provider, decode, false, kCGRenderingIntentDefault);
CGColorSpaceRelease(colorspace);
CGDataProviderRelease(provider);
CGImageRef maskedImage = CGImageCreateWithMask(image, imageMask);
CGImageRelease(imageMask);
return maskedImage;
}
#endif
//-----------------------------------------------------------------------------------
// Called for each CGPathElement when scanning the CGPath in CGPathApply()
static void MyCGPathApplier(void* info, const CGPathElement* element)
{
CGContextRef ctx = (CGContextRef)info;
switch (element->type)
{
case kCGPathElementMoveToPoint:
CGContextMoveToPoint(ctx, element->points[0].x, element->points[0].y);
break;
case kCGPathElementAddLineToPoint:
CGContextAddLineToPoint(ctx, element->points[0].x, element->points[0].y);
break;
default: // we know our path only contains line segments
break;
}
}
//-----------------------------------------------------------------------------------
static void DrawTheMTView(CGContextRef ctx, MTViewData* data)
{
CGRect dstRect;
if ((data->theImage == NULL) || (data->maskedImage == NULL))
return;
// Fill background
#if 1
HIViewGetBounds(data->theView, &dstRect);
CGContextSetRGBFillColor(ctx, 0.5, 1, 0.5, 1);
CGContextFillRect(ctx, dstRect);
#endif
// Draw the image first, before stroking the path; otherwise the path gets overwritten
dstRect = CGRectMake(0, 0, CGImageGetWidth(data->theImage), CGImageGetHeight(data->theImage));
HIViewDrawCGImage(ctx, &dstRect, data->maskedImage);
// If we already hit the selection, remove the selection from the original image.
// Because we apply a clip, save and restore the GState.
CGContextSaveGState(ctx);
if (data->hitSelection)
{
CGPathApply(data->thePath, ctx, MyCGPathApplier);
CGContextClip(ctx);
CGContextSetRGBFillColor(ctx, 1, 1, 1, 1);
CGContextFillRect(ctx, dstRect);
}
CGContextRestoreGState(ctx);
// Draw our selection path only as long as we have not hit the selection
if (!data->hitSelection && (data->thePath != NULL))
{
CGPathApply(data->thePath, ctx, MyCGPathApplier);
CGContextStrokePath(ctx);
}
if (data->pathBuildingDone)
{
// CGContextSaveGState(ctx); -- not necessary here: the HIView system saves and restores the GState from the outside
CGContextTranslateCTM(ctx, data->selectionOffset.x, data->selectionOffset.y);
CGPathApply(data->thePath, ctx, MyCGPathApplier);
CGContextClip(ctx);
if (!data->selectionMoveDone) // while we are dragging, use some transparency for the image drawing
CGContextSetAlpha(ctx, 0.5);
HIViewDrawCGImage(ctx, &dstRect, data->maskedImage);
// CGContextRestoreGState(ctx);
}
} // DrawTheMTView
// -----------------------------------------------------------------------------
static HIPoint QDGlobalToHIViewLocal( const Point inGlobalPoint, const HIViewRef inTheView)
{
HIPoint viewPoint = CGPointMake(inGlobalPoint.h, inGlobalPoint.v);
HIPointConvert(&viewPoint, kHICoordSpace72DPIGlobal, NULL, kHICoordSpaceView, inTheView);
return viewPoint;
}
// -----------------------------------------------------------------------------
static OSStatus DoTheHitTest(EventRef inEvent, MTViewData* data)
{
HIPoint where;
ControlPartCode part = kControlContentMetaPart;
GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(HIPoint), NULL, &where);
SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(ControlPartCode), &part);
// If we hit a previously clipped image portion described by data->thePath, indicate it so we can start
// dragging it around inside "DoTheTracking"
if (data->pathBuildingDone) // i.e. we have finished data->thePath to use it as grab selection
{
// Create 1x1 BitmapContext
CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
CGBitmapInfo bitmapInfo = kCGImageAlphaNoneSkipFirst;
UInt32 thePixel = 0;
CGContextRef bmpCtx = CGBitmapContextCreate(&thePixel, 1, 1, 8, 4, colorspace, bitmapInfo);
// Move it to "where"
CGContextTranslateCTM(bmpCtx, -where.x, -where.y);
// Fill the path and ...
CGPathApply(data->thePath, bmpCtx, MyCGPathApplier);
CGContextFillPath(bmpCtx);
// ... check whether we have touched thePixel
data->hitSelection = (thePixel != 0);
CGColorSpaceRelease(colorspace);
CGContextRelease(bmpCtx);
}
return noErr;
} // DoTheHitTest
// -----------------------------------------------------------------------------
static void DragImageSelectionAround(EventRef inEvent, MTViewData* data)
{
HIPoint startPt;
// Extract the mouse location (local coordinates!)
GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(HIPoint), NULL, &startPt);
data->selectionMoveDone = false;
while (true)
{
MouseTrackingResult mouseResult;
Point qdPt;
// Watch the mouse for change: qdPt comes back in global coordinates!
TrackMouseLocation((GrafPtr)(-1), &qdPt, &mouseResult);
// Bail out when the mouse is released
if ( mouseResult == kMouseTrackingMouseReleased )
{
data->selectionMoveDone = true;
break;
}
// Need to convert from global
HIPoint where = QDGlobalToHIViewLocal(qdPt, data->theView);
data->selectionOffset.x = where.x - startPt.x;
data->selectionOffset.y = where.y - startPt.y;
ControlPartCode part = 0;
SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(ControlPartCode), &part);
HIViewSetNeedsDisplay(data->theView, true);
}
} // DragImageSelectionAround
// -----------------------------------------------------------------------------
static void BuildPolygonPath(EventRef inEvent, MTViewData* data)
{
MouseTrackingResult mouseResult;
Point qdPt;
HIPoint where;
CGAffineTransform m = CGAffineTransformIdentity;
// Reset the path
if (data->thePath != NULL)
CGPathRelease(data->thePath);
data->thePath = CGPathCreateMutable();
data->pathBuildingDone = false;
data->hitSelection = false;
data->selectionOffset.x = data->selectionOffset.y = 0;
// Extract the mouse location (local coordinates!)
GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(HIPoint), NULL, &where);
CGPathMoveToPoint(data->thePath, &m, where.x, where.y);
while (true)
{
// Watch the mouse for change: qdPt comes back in global coordinates!
TrackMouseLocation((GrafPtr)(-1), &qdPt, &mouseResult);
// Bail out when the mouse is released
if ( mouseResult == kMouseTrackingMouseReleased )
{
data->pathBuildingDone = true;
break;
}
// Need to convert from global
where = QDGlobalToHIViewLocal(qdPt, data->theView);
CGPathAddLineToPoint(data->thePath, &m, where.x, where.y);
ControlPartCode part = 0;
SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(ControlPartCode), &part);
HIViewSetNeedsDisplay(data->theView, true);
}
} // BuildPolygonPath
//-----------------------------------------------------------------------------------
static OSStatus DoTheTracking(EventRef inEvent, MTViewData* data)
{
// If we hit an image selection, drag it around, else build a path
if (data->hitSelection)
DragImageSelectionAround(inEvent, data);
else
BuildPolygonPath(inEvent, data);
// One final redisplay
HIViewSetNeedsDisplay(data->theView, true);
// Send back the part upon which the mouse was released
ControlPartCode part = kControlEntireControl;
SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(ControlPartCode), &part);
return noErr;
}
//-----------------------------------------------------------------------------------
static OSStatus DoHIObjectBusiness(EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData)
{
MTViewData* data;
OSStatus err = eventNotHandledErr;
switch ( GetEventKind(inEvent) )
{
case kEventHIObjectConstruct:
{
data = (MTViewData*)malloc(sizeof(MTViewData));
// Follow the usual mechanism of setting our data as EventParameter, after recovering data->theView.
err = GetEventParameter( inEvent, kEventParamHIObjectInstance, typeHIObjectRef, NULL, sizeof(HIObjectRef*), NULL, &data->theView );
require_noerr( err, ParameterMissing );
SetEventParameter( inEvent, kEventParamHIObjectInstance, typeVoidPtr, sizeof(MTViewData), &data );
}
break;
case kEventHIObjectInitialize:
err = CallNextEventHandler( inCallRef, inEvent );
if ( err == noErr )
{
data = (MTViewData*)inUserData;
Rect bounds;
// Extract the bounds from the initialization event that we set up in CreateMouseTrackingView
err = GetEventParameter(inEvent, kCanvasBoundsParam, typeQDRectangle, NULL, sizeof(Rect), NULL, &bounds);
require_noerr(err, ParameterMissing);
SetControlBounds(data->theView, &bounds);
// Also initialize our MTViewData
data->theImage = LoadImageFromMainBundle(CFSTR("Peter.png"));
data->maskedImage = CreateMaskedImage(data->theImage);
data->thePath = NULL;
data->selectionOffset.x = data->selectionOffset.y = 0;
data->pathBuildingDone = false;
data->hitSelection = false;
data->selectionMoveDone = false;
}
break;
case kEventHIObjectDestruct:
{
CGImageRelease(data->theImage);
CGImageRelease(data->maskedImage);
CGPathRelease(data->thePath);
free(inUserData);
}
break;
}
ParameterMissing:
return err;
} // DoHIObjectBusiness
//-----------------------------------------------------------------------------------
static OSStatus
MTViewHandler( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData )
{
OSStatus err = eventNotHandledErr;
switch ( GetEventClass(inEvent) )
{
case kEventClassHIObject:
err = DoHIObjectBusiness(inCallRef, inEvent, inUserData);
break;
case kEventClassControl:
{
MTViewData* data = (MTViewData*)inUserData;
switch ( GetEventKind(inEvent) )
{
case kEventControlDraw:
{
CGContextRef ctx;
GetEventParameter( inEvent, kEventParamCGContextRef, typeCGContextRef, NULL, sizeof(CGContextRef), NULL, &ctx );
CallNextEventHandler(inCallRef, inEvent); // not really needed, here
DrawTheMTView(ctx, data);
err = noErr;
}
break;
case kEventControlHitTest:
err = DoTheHitTest(inEvent, data);
break;
case kEventControlTrack:
err = DoTheTracking(inEvent, data);
break;
} // switch
}
break; // kEventClassControl
} // switch
return err;
} // MTViewHandler
//----------------------------------------------------------------------------------- the usual boilerplate stuff
static OSStatus MyMTViewRegister(CFStringRef myClassID)
{
OSStatus err = noErr;
static HIObjectClassRef sMyViewClassRef = NULL;
if ( sMyViewClassRef == NULL )
{
EventTypeSpec eventList[] = {
{ kEventClassHIObject, kEventHIObjectConstruct },
{ kEventClassHIObject, kEventHIObjectInitialize },
{ kEventClassHIObject, kEventHIObjectDestruct },
{ kEventClassControl, kEventControlDraw },
{ kEventClassControl, kEventControlHitTest },
{ kEventClassControl, kEventControlTrack },
};
err = HIObjectRegisterSubclass( myClassID,
kHIViewClassID, // base class ID
0, // option bits
MTViewHandler, // construct proc
GetEventTypeCount( eventList ),
eventList,
NULL, // construct data
&sMyViewClassRef );
}
return err;
}
//-----------------------------------------------------------------------------------
OSStatus
CreateMouseTrackingView(HIViewRef parentView, const Rect* inBounds, HIViewID* inViewID)
{
#define kCanvasClassID CFSTR( "com.apple.sample.canvasview" )
OSStatus err;
EventRef event;
HIViewRef theView;
// Register this class
err = MyMTViewRegister(kCanvasClassID);
require_noerr( err, CantRegister );
// Make an initialization event
err = CreateEvent( NULL, kEventClassHIObject, kEventHIObjectInitialize, GetCurrentEventTime(), 0, &event );
require_noerr( err, CantCreateEvent );
// If bounds were specified, push them into the initialization event
// so that they can be used in the initialization handler.
if ( inBounds != NULL )
{
err = SetEventParameter(event, kCanvasBoundsParam, typeQDRectangle, sizeof(Rect), inBounds);
require_noerr( err, CantSetParameter );
}
err = HIObjectCreate(kCanvasClassID, event, (HIObjectRef*)&theView);
require_noerr(err, CantCreate);
if (parentView != NULL)
{
err = HIViewAddSubview(parentView, theView);
}
SetControlID(theView, inViewID); // useful if a handler needs to call GetControlByID()
HIViewSetVisible(theView, true);
CantCreate:
CantSetParameter:
CantCreateEvent:
ReleaseEvent( event );
CantRegister:
return err;
} // CreateMouseTrackingView
</pre>
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