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<pre class="sourcecodebox">/*
* File: HICustomView.c of HICustomView_Tester (4_Custom_Tracking)
*
* Contains: A custom HIView to test
*
* Version: 1.0
*
* Created: 2/14/05
*
* 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 AppleÕs
* 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: Copyright © 2005 Apple Computer, Inc, All Rights Reserved
*/
//****************************************************
#pragma mark * compilation directives *
//****************************************************
#pragma mark -
#pragma mark * includes & imports *
#include "HICustomView.h"
//****************************************************
#pragma mark -
#pragma mark * typedef's, struct's, enums, defines, etc. *
typedef struct
{
HIViewRef view; // our view
Boolean trackOn; // tracking information
HIPoint trackSpot;
}
HICustomViewData;
//****************************************************
#pragma mark -
#pragma mark * local (static) function prototypes *
static pascal OSStatus Internal_HICustomViewHandler(EventHandlerCallRef inHandlerCallRef, EventRef inEvent, void *inUserData);
static OSStatus Internal_HICustomViewTrack(HICustomViewData * myData, EventRef inEvent);
//****************************************************
#pragma mark -
#pragma mark * exported globals *
//****************************************************
#pragma mark -
#pragma mark * local (static) globals *
//****************************************************
#pragma mark -
#pragma mark * exported function implementations *
/*****************************************************
*
* HICreateCustomView(boundsRect, outHICustomView)
*
* Purpose: Create a HICustomView with minimum parameter list,
* the HICustomView can be set up later using other APIs
*
* Inputs: boundsRect - the HIRect for our view
* outHICustomView - returning the created HIView
*
* Returns: OSStatus - error code (0 == no error)
*/
OSStatus HICreateCustomView(
const HIRect * boundsRect, // can be NULL
HIViewRef * outHICustomView) // cannot be NULL
{
OSStatus status;
HIObjectRef hiObject;
require_action(outHICustomView != NULL, exitCreation, status = paramErr);
*outHICustomView = NULL;
// create the view
status = HIObjectCreate(GetHICustomViewClass(), 0, &hiObject);
require_noerr(status, exitCreation);
// position the view
if (boundsRect != NULL)
{
status = HIViewSetFrame((HIViewRef)hiObject, boundsRect);
require_noerr(status, exitCreation);
}
// return the view
*outHICustomView = (HIViewRef)hiObject;
exitCreation:
return status;
} // HICreateCustomView
/*****************************************************
*
* GetHICustomViewClass()
*
* Purpose: Registers our custom HICustomView view class and installs the appropriate handlers
*
* Inputs: none
*
* Returns: our class ID as a CFStringRef
*/
CFStringRef GetHICustomViewClass(void)
{
// following code is pretty much boiler plate.
static HIObjectClassRef theClass;
if (theClass == NULL)
{
static EventTypeSpec kFactoryEvents[] =
{
{ kEventClassHIObject, kEventHIObjectConstruct },
{ kEventClassHIObject, kEventHIObjectInitialize },
{ kEventClassHIObject, kEventHIObjectDestruct },
{ kEventClassControl, kEventControlDraw },
{ kEventClassControl, kEventControlValueFieldChanged },
{ kEventClassControl, kEventControlHiliteChanged },
{ kEventClassControl, kEventControlHitTest },
{ kEventClassControl, kEventControlTrack }
};
OSStatus status = HIObjectRegisterSubclass(kHICustomViewClass, kHIViewClassID, 0, Internal_HICustomViewHandler,
GetEventTypeCount(kFactoryEvents), kFactoryEvents, 0, &theClass);
verify_noerr(status);
}
return kHICustomViewClass;
} // GetHICustomViewClass
//****************************************************
#pragma mark -
#pragma mark * local (static) function implementations *
/*****************************************************
*
* Internal_HICustomViewHandler(inHandlerCallRef, inEvent, inUserData)
*
* Purpose: Event handler that implements our HICustomView custom view
*
* Inputs: inHandlerCallRef - reference to the current handler call chain
* inEvent - the event
* inUserData - app-specified data you passed in the call to InstallEventHandler
*
* Returns: OSStatus - error code (0 == no error)
*/
static pascal OSStatus Internal_HICustomViewHandler(EventHandlerCallRef inHandlerCallRef, EventRef inEvent, void * inUserData)
{
OSStatus status = eventNotHandledErr;
HICustomViewData * myData = (HICustomViewData *)inUserData;
switch (GetEventClass(inEvent))
{
case kEventClassHIObject:
switch (GetEventKind(inEvent))
{
case kEventHIObjectConstruct:
{
// allocate some instance data
myData = (HICustomViewData *) calloc(1, sizeof(HICustomViewData));
require_action(myData != NULL, ConstructExit, status = memFullErr);
// get our superclass instance
HIViewRef epView;
status = GetEventParameter(inEvent, kEventParamHIObjectInstance, typeHIObjectRef, NULL, sizeof(epView), NULL, &epView);
require_noerr(status, ConstructExit);
// remember our superclass in our instance data
myData->view = epView;
// calloc fills our structure with all zeroes which is what we want a default value for all our fields
// so we don't need to set them to NULL or 0 one by one
// store our instance data into the event
status = SetEventParameter(inEvent, kEventParamHIObjectInstance, typeVoidPtr, sizeof(myData), &myData);
require_noerr(status, ConstructExit);
ConstructExit:
break;
}
#pragma mark * kEventHIObjectInitialize
case kEventHIObjectInitialize:
{
// always begin kEventHIObjectInitialize by calling through to the previous handler
status = CallNextEventHandler(inHandlerCallRef, inEvent);
require_noerr(status, InitializeExit);
// if that succeeded, do our own initialization
// in this sample code, there is nothing to do
InitializeExit:
break;
}
case kEventHIObjectDestruct:
{
// freeing our storage
if (myData != NULL) free(myData);
status = noErr;
break;
}
default:
break;
}
break;
case kEventClassControl:
switch (GetEventKind(inEvent))
{
#pragma mark * kEventControlDraw
case kEventControlDraw:
{
CGContextRef context;
status = GetEventParameter(inEvent, kEventParamCGContextRef, typeCGContextRef, NULL, sizeof(context), NULL, &context);
require_noerr(status, ControlDrawExit);
HIRect bounds, viewBounds;
HIViewGetBounds(myData->view, &viewBounds);
// setting our colors according to state: IsControlEnabled, IsControlActive, IsControlHilited
if (!IsControlEnabled(myData->view))
{
CGContextSetRGBFillColor(context, 0.3, 0.3, 0.3, 0.8);
CGContextSetRGBStrokeColor(context, 0.5, 0.5, 0.5, 0.8);
}
else if (!IsControlActive(myData->view))
{
CGContextSetRGBFillColor(context, 0.7, 0.7, 0.7, 0.8);
CGContextSetRGBStrokeColor(context, 0.8, 0.8, 0.8, 0.8);
}
else if (!IsControlHilited(myData->view))
{
CGContextSetRGBFillColor(context, 1, 0, 0, 0.8);
CGContextSetRGBStrokeColor(context, 0, 0, 1, 0.8);
}
else
{
CGContextSetRGBFillColor(context, 0.7, 0, 0, 0.8);
CGContextSetRGBStrokeColor(context, 0, 0, 0.7, 0.8);
}
// using a line thickness of 3
CGContextSetLineWidth(context, 3);
bounds = CGRectInset(viewBounds, 3, 3);
float minDim = (bounds.size.height < bounds.size.width) ? bounds.size.height / 2 : bounds.size.width / 2;
float cx = bounds.origin.x + minDim, cy = bounds.origin.y + minDim;
UInt32 i, n = GetControl32BitValue(myData->view);
// having some fun with geometric shapes based on the value of the custom view
CGContextBeginPath(context);
switch (n)
{
case 0: CGContextAddArc(context, cx, cy, minDim, 0, 2 * pi, true); break;
case 1: CGContextAddEllipseInRect(context, CGRectInset(bounds, bounds.size.width * 0.4, 0)); break;
default:
{
float deltangle = pi / n, angle = 0, r = minDim / 2;
CGContextMoveToPoint(context, cx + minDim, cy);
for (i = 0; i < n; i++)
{
angle += deltangle;
CGContextAddLineToPoint(context, cx + r * cos(angle), cy + r * sin(angle));
angle += deltangle;
CGContextAddLineToPoint(context, cx + minDim * cos(angle), cy + minDim * sin(angle));
}
CGContextAddLineToPoint(context, cx + minDim, cy);
}
}
CGContextClosePath(context);
CGContextDrawPath(context, kCGPathFillStroke);
// if we're tracking then we also draw the track spot
if (myData->trackOn)
{
CGContextBeginPath(context);
CGContextAddArc(context, myData->trackSpot.x, myData->trackSpot.y, 10, 0, 2 * pi, 1);
CGContextClosePath(context);
CGContextSetRGBFillColor(context, 0.7, 0, 0.7, 0.8);
CGContextSetRGBStrokeColor(context, 0, 0.7, 0.7, 0.8);
CGContextDrawPath(context, kCGPathFillStroke);
}
status = noErr;
ControlDrawExit:
break;
}
#pragma mark * kEventControl___Changed
case kEventControlValueFieldChanged:
case kEventControlHiliteChanged:
{
// just asking for a refresh
HIViewSetNeedsDisplay(myData->view, true);
break;
}
#pragma mark * kEventControlHitTest
case kEventControlHitTest:
{
// we need to implement the kEventControlHitTest handler so that either our kEventControlTrack handler
// or our kEventControlHiliteChanged handler will be called
HIPoint mouseLoc;
status = GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(mouseLoc), NULL, &mouseLoc);
require_noerr(status, ControlHitTestExit);
HIRect hiBounds;
status = HIViewGetBounds(myData->view, &hiBounds);
require_noerr(status, ControlHitTestExit);
ControlPartCode partCode = ( CGRectContainsPoint(hiBounds, mouseLoc) ) ? kControlButtonPart : kControlNoPart;
status = SetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, sizeof(partCode), &partCode);
require_noerr(status, ControlHitTestExit);
ControlHitTestExit:
break;
}
#pragma mark * kEventControlTrack
case kEventControlTrack:
{
// handling the mouse tracking
status = Internal_HICustomViewTrack(myData, inEvent);
break;
}
default:
break;
}
break;
default:
break;
}
return status;
} // Internal_HICustomViewHandler
/*****************************************************
*
* Internal_HICustomViewTrack(myData, inEvent)
*
* Purpose: Track Event handler
*
* Inputs: myData - our custom view data
* inEvent - the event
*
* Returns: OSStatus - error code (0 == no error)
*/
static OSStatus Internal_HICustomViewTrack(HICustomViewData * myData, EventRef inEvent)
{
// Here we are having some fun with a time-controlled value setting
// The value is going to be incremented each time we move within our bounds
// or incremented every 1/3 second if we don't move but are within our bounds
// If we reach the maximum, we go back to the minimum
OSStatus status;
// Getting our bounds and locations
HIRect hiViewBounds;
status = HIViewGetBounds(myData->view, &hiViewBounds);
require_noerr(status, HIViewGetBounds);
Rect qdWindowBounds;
status = GetWindowBounds(GetControlOwner(myData->view), kWindowStructureRgn, &qdWindowBounds);
require_noerr(status, GetWindowBounds);
HIPoint hiPoint;
status = GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(hiPoint), NULL, &hiPoint);
require_noerr(status, GetEventParameter);
// handle the first mouseDown before moving
MouseTrackingResult mouseStatus = kMouseTrackingMouseDown;
while (mouseStatus != kMouseTrackingMouseUp)
{
if (CGRectContainsPoint(hiViewBounds, hiPoint))
{
if (hiPoint.x < hiViewBounds.origin.x+4) hiPoint.x = hiViewBounds.origin.x+4;
if (hiPoint.x > hiViewBounds.origin.x+hiViewBounds.size.width-4) hiPoint.x = hiViewBounds.origin.x+hiViewBounds.size.width-4;
if (hiPoint.y < hiViewBounds.origin.y+4) hiPoint.y = hiViewBounds.origin.y+4;
if (hiPoint.y > hiViewBounds.origin.y+hiViewBounds.size.height-4) hiPoint.y = hiViewBounds.origin.y+hiViewBounds.size.height-4;
myData->trackSpot = hiPoint;
// setting the new value
SInt32 currentValue = GetControl32BitValue(myData->view);
UInt32 newValue = currentValue + 1;
newValue %= (GetControl32BitMaximum(myData->view) + 1);
SetControl32BitValue(myData->view, newValue);
myData->trackOn = true;
HiliteControl(myData->view, 1);
}
else if (myData->trackOn)
{
myData->trackOn = false;
HiliteControl(myData->view, 0);
}
// a -1 GrafPtr to TrackMouseLocationWithOptions yields global coordinates
Point qdPoint;
status = TrackMouseLocationWithOptions((GrafPtr)-1L, 0, kEventDurationSecond / 3, &qdPoint, NULL, &mouseStatus);
require_noerr(status, TrackMouseLocation);
// convert to window-relative coordinates
hiPoint.x = qdPoint.h - qdWindowBounds.left;
hiPoint.y = qdPoint.v - qdWindowBounds.top;
// convert to view-relative coordinates
HIViewConvertPoint(&hiPoint, NULL, myData->view);
}
SendEventToEventTarget:
GetWindowEventTarget:
SetEventParameter:
CreateEvent:
TrackMouseLocation:
GetEventParameter:
GetWindowBounds:
HIViewGetBounds:
myData->trackOn = false;
HiliteControl(myData->view, 0);
return status;
}
</pre>
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