/*

    File:       HISimpleList.cp

    Contains:   Demonstrates creating a simple list using the HIView APIs.

    Version:    1.0.2

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    Copyright © 2002 Apple Computer, Inc., All Rights Reserved

*/

#include <Carbon/Carbon.h>

#include "HISimpleList.h"

// structure in which we hold our custom push button's data

typedef struct

    {

    HIViewRef   view;                           // the HIViewRef for our list

    HIPoint     originPoint;

    HISize      lineSize;

    UInt32      nbLines;

    }

SimpleListData;

pascal OSStatus ViewHandler(EventHandlerCallRef inCaller, EventRef inEvent, void* inRefcon);

CFStringRef GetSimpleListClass();

/*

 *  HICreateSimpleList()

 *  

 *  Summary:

 *    Creates a simple list control.

 *  

 *  Parameters:

 *    

 *    outSimpleList:

 *      On exit, contains the new control.

 *  

 *  Availability:

 *    Mac OS X:         in version 10.2 and later since it needs the HIView APIs

 *    CarbonLib:        not available

 *    Non-Carbon CFM:   not available

 */

extern OSStatus 

HICreateSimpleList(HIViewRef * outSimpleList)

    {

    HIViewRef scrollView;

    *outSimpleList = NULL;

    OSStatus status = HIScrollViewCreate(kHIScrollViewOptionsVertScroll | kHIScrollViewOptionsAllowGrow, &scrollView);

    if (status != noErr) goto exitCreate;

    HIObjectRef hiObject;

    status = HIObjectCreate(GetSimpleListClass(), 0, &hiObject);

    if (status != noErr) goto exitCreate;

    status = HIViewAddSubview(scrollView, (HIViewRef)hiObject);

    if (status != noErr) goto exitCreate;

    HIViewSetVisible(scrollView, true);

    HIViewSetVisible((HIViewRef)hiObject, true);

//  HIScrollViewSetScrollBarAutoHide(scrollView, true);

    *outSimpleList = scrollView;

exitCreate:

    return status;

    }

// background colors for alternate lines

#define kWhitish 57536

RGBColor gBackGrounds[] =

    {

        {65535, kWhitish, kWhitish},

        {kWhitish, 65535, kWhitish},

        {kWhitish, kWhitish, 65535},

        {65535, 65535, kWhitish},

        {65535, kWhitish, 65535},

        {kWhitish, 65535, 65535},

        {3060, 3060, 30600}

    };

OSStatus SimpleListViewDrawing(CGContextRef context, const HIRect * bounds, const SimpleListData * myData)

    {

    UInt32 start, end, i;

    start = (int) (myData->originPoint.y / myData->lineSize.height);

    end = (int) ((myData->originPoint.y + bounds->size.height) / myData->lineSize.height + 1);

    CGContextSelectFont(context, "Helvetica", myData->lineSize.height * 0.75, kCGEncodingMacRoman);

    char p[20];

    HIRect lineBounds = *bounds;

    lineBounds.size.height = myData->lineSize.height;

    float y = start * myData->lineSize.height - myData->originPoint.y;

    lineBounds.origin.y = y;

    for (i = start; (i<= end) && (i < myData->nbLines); i++, y += myData->lineSize.height)

        {

        CGContextSetRGBFillColor(context, RGBToFloatRed(i % 6), RGBToFloatGreen(i % 6), RGBToFloatBlue(i % 6), 1.0);

        CGContextFillRect(context, lineBounds);

        CGContextSetRGBFillColor(context, 0.0, 0.0, 0.0, 1.0);

        CGContextSetTextPosition(context, 10.0, y + 0.75 * myData->lineSize.height);

        sprintf(p, "Line %ld", i+1);

        CGContextShowText(context, p, strlen(p));

        lineBounds.origin.y += myData->lineSize.height;

        }

    return noErr;

    }

/*----------------------------------------------------------------------------------------------------------*/

//  ¥ GetSimpleListClass

//  Registers and returns an HIObject class for a simple list control.

/*----------------------------------------------------------------------------------------------------------*/

CFStringRef GetSimpleListClass()

    {

    // following code is pretty much boiler plate.

    static HIObjectClassRef theClass;

    if (theClass == NULL)

        {

        static EventTypeSpec kFactoryEvents[] =

            {

                // the next 3 messages are boiler plate

                { kEventClassHIObject, kEventHIObjectConstruct },

                { kEventClassHIObject, kEventHIObjectInitialize },

                { kEventClassHIObject, kEventHIObjectDestruct },

                // the next 2 messages are Scroll specific

                { kEventClassScrollable, kEventScrollableGetInfo },

                { kEventClassScrollable, kEventScrollableScrollTo },

                // the next 2 messages are Control specific

                { kEventClassControl, kEventControlSetData },

                { kEventClassControl, kEventControlDraw }

            };

        HIObjectRegisterSubclass(kSimpleListClassID, kHIViewClassID, 0, ViewHandler,

                                  GetEventTypeCount(kFactoryEvents), kFactoryEvents, 0, &theClass);

        }

    return kSimpleListClassID;

    }

/*----------------------------------------------------------------------------------------------------------*/

//  ¥ ViewHandler

//  Event handler that implements our simple list control.

/*----------------------------------------------------------------------------------------------------------*/

pascal OSStatus ViewHandler(EventHandlerCallRef inCaller, EventRef inEvent, void* inRefcon)

    {

    OSStatus result = eventNotHandledErr;

    SimpleListData* myData = (SimpleListData*)inRefcon;

    switch (GetEventClass(inEvent))

        {

        case kEventClassHIObject:

            switch (GetEventKind(inEvent))

                {

                case kEventHIObjectConstruct:

                    {

                    // allocate some instance data

                    SimpleListData* myData = (SimpleListData*) calloc(1, sizeof(SimpleListData));

                    // get our superclass instance

                    HIViewRef epView;

                    GetEventParameter(inEvent, kEventParamHIObjectInstance, typeHIObjectRef, NULL, sizeof(epView), NULL, &epView);

                    // remember our superclass in our instance data and initialize other fields

                    myData->view = epView;

                    myData->originPoint.x = 0;

                    myData->originPoint.y = 0;

                    myData->lineSize.width = 0;

                    myData->lineSize.height = 24;

                    myData->nbLines = 100;

                    // set the control ID so that we can find it later with HIViewFindByID

                    result = SetControlID(myData->view, &kSimpleListViewID);

                    if (result != noErr) DebugStr("\pSetControlID failed!");

                    // store our instance data into the event

                    result = SetEventParameter(inEvent, kEventParamHIObjectInstance, typeVoidPtr, sizeof(myData), &myData);

                    break;

                    }

                case kEventHIObjectDestruct:

                    {

                    free(myData);

                    result = noErr;

                    break;

                    }

                case kEventHIObjectInitialize:

                    {

                    // always begin kEventHIObjectInitialize by calling through to the previous handler

                    result = CallNextEventHandler(inCaller, inEvent);

                    // if that succeeded, do our own initialization

                    if (result == noErr)

                        {

                        // nothing to do here

                        }

                    break;

                    }

                default:

                    break;

                }

            break;

        case kEventClassScrollable:

            switch (GetEventKind(inEvent))

                {

                case kEventScrollableGetInfo:

                    {

                    // we're being asked to return information about the scrolled view that we set as Event Parameters

                    HISize imageSize = myData->lineSize;

                    imageSize.height *= myData->nbLines;

                    SetEventParameter(inEvent, kEventParamImageSize, typeHISize, sizeof(imageSize), &imageSize);

                    HIRect bounds;

                    HIViewGetBounds(myData->view, &bounds);

                    SetEventParameter(inEvent, kEventParamViewSize, typeHISize, sizeof(bounds.size), &bounds.size);

                    SetEventParameter(inEvent, kEventParamLineSize, typeHISize, sizeof(myData->lineSize), &myData->lineSize);

                    SetEventParameter(inEvent, kEventParamOrigin, typeHIPoint, sizeof(myData->originPoint), &myData->originPoint);

                    result = noErr;

                    break;

                    }

                case kEventScrollableScrollTo:

                    {

                    // we're being asked to scroll, we just do a sanity check and ask for a redraw

                    HIPoint where;

                    GetEventParameter(inEvent, kEventParamOrigin, typeHIPoint, NULL, sizeof(where), NULL, &where);

                    myData->originPoint.y = (where.y < 0.0)?0.0:where.y;

                    HIViewSetNeedsDisplay(myData->view, true);

                    break;

                    }

                default:

                    break;

                }

            break;

        case kEventClassControl:

            switch (GetEventKind(inEvent))

                {

                //  Draw the view.

                case kEventControlDraw:

                    {

                    CGContextRef context;

                    result = GetEventParameter(inEvent, kEventParamCGContextRef, typeCGContextRef, NULL, sizeof(context), NULL, &context);

                    if (result != noErr) {DebugStr("\pGetEventParameter failed for kEventControlDraw"); break;}

                    HIRect bounds;

                    HIViewGetBounds(myData->view, &bounds);

                    CGContextSaveGState(context);

                    CGAffineTransform transform = CGAffineTransformIdentity;

                    // adjust the transform so the text doesn't draw upside down

                    transform = CGAffineTransformScale(transform, 1, -1);

                    CGContextSetTextMatrix(context, transform);

                    // now that the proper parameters and configurations have been dealt with, let's draw

                    SimpleListViewDrawing(context, &bounds, myData);

                    CGContextRestoreGState(context);

                    result = noErr;

                    break;

                    }

                case kEventControlSetData:

                    {

                    // we override this event, being only interested in the kSetNumberOfLinesCommand tag

                    // if that's the case, we then get the value, and send a kEventClassScrollable + kEventScrollableInfoChanged

                    // to the scrollview so that it will then ask us for a kEventClassScrollable + kEventScrollableGetInfo and change

                    // its internal state, we also ask for a later redraw.

                    UInt32 theCommand, theData, theNewValue;

                    Boolean changed = false;

                    GetEventParameter(inEvent, kEventParamControlDataTag, typeEnumeration, NULL, sizeof(theCommand), NULL, &theCommand);

                    GetEventParameter(inEvent, kEventParamControlDataBuffer, typePtr, NULL, sizeof(theData), NULL, &theData);

                    switch (theCommand)

                        {

                        case kSetNumberOfLinesCommand:

                            {

                            theNewValue = *((UInt32 *)theData);

                            if (theNewValue != myData->nbLines) {changed = true; myData->nbLines = theNewValue;}

                            }

                            break;

                        default:

                            break;

                        }

                    if (changed)

                        {

                        HISize imageSize = myData->lineSize;

                        imageSize.height *= myData->nbLines;

                        HIRect bounds;

                        HIViewGetBounds(myData->view, &bounds);

                        if (myData->originPoint.y + bounds.size.height > imageSize.height) 

                            myData->originPoint.y = imageSize.height - bounds.size.height;

                        if (myData->originPoint.y < 0) myData->originPoint.y = 0;

                        EventRef theEvent;

                        CreateEvent(NULL, kEventClassScrollable, kEventScrollableInfoChanged, GetCurrentEventTime(), kEventAttributeUserEvent, &theEvent);

                        SendEventToEventTarget(theEvent, GetControlEventTarget(myData->view));

                        ReleaseEvent(theEvent);

                        HIViewSetNeedsDisplay(myData->view, true);

                        HIViewSetNeedsDisplay(HIViewGetSuperview(myData->view), true);

                        }

                    break;

                    }

                default:

                    break;

                }

            break;

        default:

            break;

        }

    return result;

    }