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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>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="home" href="http://developer.apple.com/">
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<title>MouseTracking - /MouseTrackingView-QD.c</title>
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<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">
<tr align="left" valign="top">
<td><h1><div id="pagehead">MouseTracking</div></h1></td>
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<h2>/MouseTrackingView-QD.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>
<strong><a href="MouseTracking.dmg">Download Sample</a></strong> (“MouseTracking.dmg”, 175.0K)</p>
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<!--googleon: index -->
<pre class="sourcecodebox">/*
File: MouseTrackingView-QD.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
*/
/****************************************************************************************************
* The starting point of our MouseTrackingDemo: use a QD polygon structure to demo freehand sketching.
****************************************************************************************************/
#include "MouseTrackingView.h"
// A pointer to this per-view storage gets passed to the EventHandler as "userData".
struct MTViewData {
HIViewRef theView;
PolyHandle thePoly;
};
typedef struct MTViewData MTViewData;
//-----------------------------------------------------------------------------------
static void DrawTheMTView(CGContextRef ctx, MTViewData* data)
{
if (data->thePoly != NULL)
FramePoly(data->thePoly);
}
// -----------------------------------------------------------------------------
static HIPoint ConvertGlobalQDPointToViewHIPoint( const Point inGlobalPoint, const HIViewRef inDestView )
{
Point localPoint = inGlobalPoint;
HIPoint viewPoint;
HIViewRef contentView;
QDGlobalToLocalPoint( GetWindowPort(GetControlOwner(inDestView)), &localPoint );
// convert the QD point to an HIPoint
viewPoint = CGPointMake(localPoint.h, localPoint.v);
// get the content view (which is what the local point is relative to)
HIViewFindByID(HIViewGetRoot(GetControlOwner(inDestView)), kHIViewWindowContentID, &contentView);
// convert to view coordinates
HIViewConvertPoint( &viewPoint, contentView, inDestView );
return viewPoint;
}
//-----------------------------------------------------------------------------------
static OSStatus
MTViewHandler( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData )
{
OSStatus err = eventNotHandledErr;
HIPoint where;
ControlPartCode part;
UInt32 eventClass = GetEventClass( inEvent );
UInt32 eventKind = GetEventKind( inEvent );
MTViewData* data = (MTViewData*)inUserData; // pointless for the kEventHIObjectConstruct event
switch ( eventClass )
{
//--------------------------- some boilerplate HIObject business
case kEventClassHIObject:
switch ( eventKind )
{
case kEventHIObjectConstruct:
{
data = (MTViewData*)malloc(sizeof(MTViewData));
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 )
{
Rect bounds;
// Extract the bounds from the initialization event that we set up
err = GetEventParameter(inEvent, kCanvasBoundsParam, typeQDRectangle, NULL, sizeof(Rect), NULL, &bounds);
require_noerr(err, ParameterMissing);
SetControlBounds(data->theView, &bounds);
// Also initialize our MTViewData
data->thePoly = NULL;
}
break;
case kEventHIObjectDestruct:
free(inUserData);
break;
}
break; // kEventClassHIObject
//--------------------------- kEventControlDraw, kEventControlHitTest and kEventControlTrack:
case kEventClassControl:
switch ( eventKind )
{
case kEventControlDraw:
{
CGContextRef ctx;
GetEventParameter( inEvent, kEventParamCGContextRef, typeCGContextRef, NULL, sizeof(CGContextRef), NULL, &ctx );
CallNextEventHandler(inCallRef, inEvent); // Erase old content
DrawTheMTView(ctx, data);
err = noErr;
}
break;
case kEventControlHitTest:
{
GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(HIPoint), NULL, &where);
part = kControlContentMetaPart;
SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(ControlPartCode), &part);
err = noErr;
}
break;
case kEventControlTrack:
{
MouseTrackingResult mouseResult;
Point qdPt;
// Extract the mouse location (local coordinates!)
GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(HIPoint), NULL, &where);
// Reset the polygon
if (data->thePoly != NULL)
KillPoly(data->thePoly);
data->thePoly = OpenPoly();
MoveTo(where.x, where.y);
// also need to call ShowPen, or we don't see our line drawing
ShowPen();
while (true)
{
// Watch the mouse for change: qdPt comes back in global coordinates!
err = TrackMouseLocation((GrafPtr)(-1), &qdPt, &mouseResult);
// Bail out when the mouse is released
if ( mouseResult == kMouseTrackingMouseReleased )
{
// Time to close the polygon, and balance or extra ShowPen call
HidePen();
ClosePoly();
break;
}
// Need to convert from global
where = ConvertGlobalQDPointToViewHIPoint(qdPt, data->theView);
LineTo(where.x, where.y);
part = 0;
SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(ControlPartCode), &part);
HIViewSetNeedsDisplay(data->theView, true);
}
// Send back the part upon which the mouse was released
part = kControlEntireControl;
SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(ControlPartCode), &part);
}
break;
}
break; // kEventClassControl
}
ParameterMissing:
return err;
}
//----------------------------------------------------------------------------------- (more 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;
}
</pre>
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