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

#

#   Apple Macintosh Developer Technical Support

#

#   MultiFinder-Aware Simple TextEdit Sample Application

#

#   TESample

#

#   This file: TESample.c   -   C Source

#

#   Copyright © 1989 Apple Computer, Inc.

#   All rights reserved.

#

#   Versions:   

#               1.00                08/88

#               1.01                11/88

#               1.02                04/89

#               1.03                06/89

#

#   Components:

#               TESample.p          June 1, 1989

#               TESample.c          June 1, 1989

#               TESampleGlue.a      June 1, 1989    -MPW only-

#               TESample.r          June 1, 1989

#               TESample.h          June 1, 1989

#               PTESample.make      June 1, 1989    -MPW only-

#               CTESample.make      June 1, 1989    -MPW only-

#               TESampleGlue.s      June 1, 1989    -A/UX only-

#               TESampleAUX.r       June 1, 1989    -A/UX only-

#               Makefile            June 1, 1989    -A/UX only-

#

#   TESample is an example application that demonstrates how 

#   to initialize the commonly used toolbox managers, operate 

#   successfully under MultiFinder, handle desk accessories and 

#   create, grow, and zoom windows. The fundamental TextEdit 

#   toolbox calls and TextEdit autoscroll are demonstrated. It 

#   also shows how to create and maintain scrollbar controls.

#

#   It does not by any means demonstrate all the techniques you 

#   need for a large application. In particular, Sample does not 

#   cover exception handling, multiple windows/documents, 

#   sophisticated memory management, printing, or undo. All of 

#   these are vital parts of a normal full-sized application.

#

#   This application is an example of the form of a Macintosh 

#   application; it is NOT a template. It is NOT intended to be 

#   used as a foundation for the next world-class, best-selling, 

#   600K application. A stick figure drawing of the human body may 

#   be a good example of the form for a painting, but that does not 

#   mean it should be used as the basis for the next Mona Lisa.

#

#   We recommend that you review this program or Sample before 

#   beginning a new application. Sample is a simple app. which doesnÕt 

#   use TextEdit or the Control Manager.

#

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

/* Segmentation strategy:

   This program consists of three segments. Main contains most of the code,

   including the MPW libraries, and the main program. Initialize contains

   code that is only used once, during startup, and can be unloaded after the

   program starts. %A5Init is automatically created by the Linker to initialize

   globals for the MPW libraries and is unloaded right away. */

/* SetPort strategy:

   Toolbox routines do not change the current port. In spite of this, in this

   program we use a strategy of calling SetPort whenever we want to draw or

   make calls which depend on the current port. This makes us less vulnerable

   to bugs in other software which might alter the current port (such as the

   bug (feature?) in many desk accessories which change the port on OpenDeskAcc).

   Hopefully, this also makes the routines from this program more self-contained,

   since they don't depend on the current port setting. */

/* Clipboard strategy:

   This program does not maintain a private scrap. Whenever a cut, copy, or paste

   occurs, we import/export from the public scrap to TextEdit's scrap right away,

   using the TEToScrap and TEFromScrap routines. If we did use a private scrap,

   the import/export would be in the activate/deactivate event and suspend/resume

   event routines. */

#include <Types.h>

#include <QuickDraw.h>

#include <QDOffscreen.h>

#include <Fonts.h>

#include <Events.h>

#include <Controls.h>

#include <Windows.h>

#include <Menus.h>

#include <TextEdit.h>

#include <Dialogs.h>

#include <Desk.h>

#include <Scrap.h>

#include <ToolUtils.h>

#include <Memory.h>

#include <SegLoad.h>

#include <Files.h>

#include <OSUtils.h>

#include <OSEvents.h>

#include <Packages.h>

#include <Traps.h>

#include <Printing.h>

#include <DiskInit.h>

#include <Errors.h>

#include <GestaltEqu.h>

#include <AppleEvents.h>

#include "TESample.h"       /* bring in all the #defines for TESample */

/* A DocumentRecord contains the WindowRecord for one of our document windows,

   as well as the TEHandle for the text we are editing. Other document fields

   can be added to this record as needed. For a similar example, see how the

   Window Manager and Dialog Manager add fields after the GrafPort. */

typedef struct {

    WindowRecord    docWindow;

    TEHandle        docTE;

    ControlHandle   docVScroll;

    ControlHandle   docHScroll;

    TEClickLoopUPP  docClick;

    GWorldPtr       docImage;

} DocumentRecord, *DocumentPeek;

/* The "g" prefix is used to emphasize that a variable is global. */

/* GMac is used to hold the result of a SysEnvirons call. This makes

   it convenient for any routine to check the environment. It is

   global information, anyway. */

SysEnvRec   gMac;               /* set up by Initialize */

/* GHasWaitNextEvent is set at startup, and tells whether the WaitNextEvent

   trap is available. If it is false, we know that we must call GetNextEvent. */

Boolean     gHasWaitNextEvent;  /* set up by Initialize */

/* GInBackground is maintained by our OSEvent handling routines. Any part of

   the program can check it to find out if it is currently in the background. */

Boolean     gInBackground;      /* maintained by Initialize and DoEvent */

/* GNumDocuments is used to keep track of how many open documents there are

   at any time. It is maintained by the routines that open and close documents. */

short       gNumDocuments;      /* maintained by Initialize, DoNew, and DoCloseWindow */

#if powerc

TEClickLoopUPP gClickLoopUPP;

#endif

ControlActionUPP gHActionUPP;

ControlActionUPP gVActionUPP;

QDRectUPP        gQDRectUPP;

QDRgnUPP         gQDRgnUPP;

/* Here are declarations for all of the C routines. In MPW 3.0 we can use

   actual prototypes for parameter type checking. A/UX C does not grok

   prototypes, so eliminate them under A/UX */

    void AlertUser( short error );

    void EventLoop( void );

    void DoEvent( EventRecord *event );

    void AdjustCursor( Point mouse, RgnHandle region );

    void GetGlobalMouse( Point *mouse );

    void DoGrowWindow( WindowPtr window, EventRecord *event );

    void DoZoomWindow( WindowPtr window, short part );

    void ResizeWindow( WindowPtr window );

    void GetLocalUpdateRgn( WindowPtr window, RgnHandle localRgn );

    void DoUpdate( WindowPtr window );

    void PaintImage( void );

    void DoDeactivate( WindowPtr window );

    void DoActivate( WindowPtr window, Boolean becomingActive );

    void DoContentClick( WindowPtr window, EventRecord *event );

    void DoKeyDown( EventRecord *event );

    unsigned long GetSleep( void );

    void CommonAction( ControlHandle control, short *amount );

    pascal void VActionProc( ControlHandle control, short part );

    pascal void HActionProc( ControlHandle control, short part );

    void DoIdle( void );

    void DrawWindow( WindowPtr window );

    void AdjustMenus( void );

    void DoMenuCommand( long menuResult );

pascal void CustomRect(

    GrafVerb verb,

    Rect     *destRect);

pascal void CustomRgn(

    GrafVerb  verb,

    RgnHandle destRgn);

    void DoNew( void );

    Boolean DoCloseWindow( WindowPtr window );

    void Terminate( void );

    void Initialize( void );

    void BigBadError( short error );

    void GetTERect( WindowPtr window, Rect *teRect );

    void AdjustViewRect( TEHandle docTE );

    void AdjustTE( WindowPtr window );

    void AdjustHV( Boolean isVert, ControlHandle control, TEHandle docTE,

                    Boolean canRedraw );

    void AdjustScrollValues( WindowPtr window, Boolean canRedraw );

    void AdjustScrollSizes( WindowPtr window );

    void AdjustScrollbars( WindowPtr window, Boolean needsResize );

    #if powerc

    pascal Boolean ClickLoopProc(TEPtr pTE);

    #else

    extern pascal void AsmClickLoopProc(void);

    #endif

    pascal void ClickLoopAddOn(void);

    pascal TEClickLoopUPP GetOldClickLoop(void);

    Boolean IsAppWindow( WindowPtr window );

    Boolean IsDAWindow( WindowPtr window );

    Boolean TrapAvailable( short tNumber);

/* Define HiWrd and LoWrd macros for efficiency. */

#define HiWrd(aLong)    (((aLong) >> 16) & 0xFFFF)

#define LoWrd(aLong)    ((aLong) & 0xFFFF)

/* Define TopLeft and BotRight macros for convenience. Notice the implicit

   dependency on the ordering of fields within a Rect */

#define TopLeft(aRect)  (* (Point *) &(aRect).top)

#define BotRight(aRect) (* (Point *) &(aRect).bottom)

/* This routine is part of the MPW runtime library. This external

   reference to it is done so that we can unload its segment, %A5Init. */

#ifndef THINK_C

  extern void _DataInit();

#endif

/* A reference to our assembly language routine that gets attached to the clikLoop

field of our TE record. */

extern pascal void AsmClikLoop();

#ifdef powerc

   QDGlobals    qd;

#endif

#pragma segment Main

main()

{

#ifndef THINK_C

    UnloadSeg((Ptr) _DataInit);     /* note that _DataInit must not be in Main! */

#endif

    /* 1.01 - call to ForceEnvirons removed */

    /*  If you have stack requirements that differ from the default,

        then you could use SetApplLimit to increase StackSpace at 

        this point, before calling MaxApplZone. */

    MaxApplZone();                  /* expand the heap so code segments load at the top */

    Initialize();                   /* initialize the program */

#ifndef THINK_C

    UnloadSeg((Ptr) Initialize);    /* note that Initialize must not be in Main! */

#endif

    EventLoop();                    /* call the main event loop */

}

/* Get events forever, and handle them by calling DoEvent.

   Also call AdjustCursor each time through the loop. */

#pragma segment Main

void EventLoop()

{

    RgnHandle   cursorRgn;

    Boolean     gotEvent;

    EventRecord event;

    Point       mouse;

    cursorRgn = NewRgn();           /* weÕll pass WNE an empty region the 1st time thru */

    do {

        /* use WNE if it is available */

        if ( gHasWaitNextEvent ) {

            GetGlobalMouse(&mouse);

            AdjustCursor(mouse, cursorRgn);

            gotEvent = WaitNextEvent(everyEvent, &event, GetSleep(), cursorRgn);

        }

        else {

            SystemTask();

            gotEvent = GetNextEvent(everyEvent, &event);

        }

        if ( gotEvent ) {

            /* make sure we have the right cursor before handling the event */

            AdjustCursor(event.where, cursorRgn);

            DoEvent(&event);

        }

        else

            DoIdle();               /* perform idle tasks when itÕs not our event */

        /*  If you are using modeless dialogs that have editText items,

            you will want to call IsDialogEvent to give the caret a chance

            to blink, even if WNE/GNE returned FALSE. However, check FrontWindow

            for a non-NIL value before calling IsDialogEvent. */

    } while ( true );   /* loop forever; we quit via ExitToShell */

} /*EventLoop*/

/* Do the right thing for an event. Determine what kind of event it is, and call

 the appropriate routines. */

#pragma segment Main

void DoEvent(event)

    EventRecord *event;

{

    short       part, err;

    WindowPtr   window;

    char        key;

    Point       aPoint;

    switch ( event->what ) {

        case nullEvent:

            /* we idle for null/mouse moved events ands for events which arenÕt

                ours (see EventLoop) */

            DoIdle();

            break;

        case mouseDown:

            part = FindWindow(event->where, &window);

            switch ( part ) {

                case inMenuBar:             /* process a mouse menu command (if any) */

                    AdjustMenus();  /* bring Õem up-to-date */

                    DoMenuCommand(MenuSelect(event->where));

                    break;

                case inSysWindow:           /* let the system handle the mouseDown */

                    SystemClick(event, window);

                    break;

                case inContent:

                    if ( window != FrontWindow() ) {

                        SelectWindow(window);

                        /*DoEvent(event);*/ /* use this line for "do first click" */

                    } else

                        DoContentClick(window, event);

                    break;

                case inDrag:                /* pass screenBits.bounds to get all gDevices */

                    DragWindow(window, event->where, &qd.screenBits.bounds);

                    break;

                case inGoAway:

                    if ( TrackGoAway(window, event->where) )

                        DoCloseWindow(window); /* we donÕt care if the user cancelled */

                    break;

                case inGrow:

                    DoGrowWindow(window, event);

                    break;

                case inZoomIn:

                case inZoomOut:

                if ( TrackBox(window, event->where, part) )

                        DoZoomWindow(window, part);

                    break;

            }

            break;

        case keyDown:

        case autoKey:                       /* check for menukey equivalents */

            key = event->message & charCodeMask;

            if ( event->modifiers & cmdKey ) {  /* Command key down */

                if ( event->what == keyDown ) {

                    AdjustMenus();          /* enable/disable/check menu items properly */

                    DoMenuCommand(MenuKey(key));

                }

            } else

                DoKeyDown(event);

            break;

        case activateEvt:

            DoActivate((WindowPtr) event->message, (event->modifiers & activeFlag) != 0);

            break;

        case updateEvt:

            DoUpdate((WindowPtr) event->message);

            break;

        /*  1.01 - It is not a bad idea to at least call DIBadMount in response

            to a diskEvt, so that the user can format a floppy. */

        case diskEvt:

            if ( HiWord(event->message) != noErr ) {

                SetPt(&aPoint, kDILeft, kDITop);

                err = DIBadMount(aPoint, event->message);

            }

            break;

        case kOSEvent:

        /*  1.02 - must BitAND with 0x0FF to get only low byte */

            switch ((event->message >> 24) & 0x0FF) {       /* high byte of message */

                case kMouseMovedMessage:

                    DoIdle();                   /* mouse-moved is also an idle event */

                    break;

                case kSuspendResumeMessage:     /* suspend/resume is also an activate/deactivate */

                    gInBackground = (event->message & kResumeMask) == 0;

                    DoActivate(FrontWindow(), !gInBackground);

                    break;

            }

            break;

    }

} /*DoEvent*/

/*  Change the cursor's shape, depending on its position. This also calculates the region

    where the current cursor resides (for WaitNextEvent). When the mouse moves outside of

    this region, an event is generated. If there is more to the event than just

    Òthe mouse movedÓ, we get called before the event is processed to make sure

    the cursor is the right one. In any (ahem) event, this is called again before we

    fall back into WNE. */

#pragma segment Main

void AdjustCursor(mouse,region)

    Point       mouse;

    RgnHandle   region;

{

    WindowPtr   window;

    RgnHandle   arrowRgn;

    RgnHandle   iBeamRgn;

    Rect        iBeamRect;

    window = FrontWindow(); /* we only adjust the cursor when we are in front */

    if ( (! gInBackground) && (! IsDAWindow(window)) ) {

        /* calculate regions for different cursor shapes */

        arrowRgn = NewRgn();

        iBeamRgn = NewRgn();

        /* start arrowRgn wide open */

        SetRectRgn(arrowRgn, kExtremeNeg, kExtremeNeg, kExtremePos, kExtremePos);

        /* calculate iBeamRgn */

        if ( IsAppWindow(window) ) {

            iBeamRect = (*((DocumentPeek) window)->docTE)->viewRect;

            SetPort(window);    /* make a global version of the viewRect */

            LocalToGlobal(&TopLeft(iBeamRect));

            LocalToGlobal(&BotRight(iBeamRect));

            RectRgn(iBeamRgn, &iBeamRect);

            /* we temporarily change the portÕs origin to ÒglobalfyÓ the visRgn */

            SetOrigin(-window->portBits.bounds.left, -window->portBits.bounds.top);

            SectRgn(iBeamRgn, window->visRgn, iBeamRgn);

            SetOrigin(0, 0);

        }

        /* subtract other regions from arrowRgn */

        DiffRgn(arrowRgn, iBeamRgn, arrowRgn);

        /* change the cursor and the region parameter */

        if ( PtInRgn(mouse, iBeamRgn) ) {

            SetCursor(*GetCursor(iBeamCursor));

            CopyRgn(iBeamRgn, region);

        } else {

            SetCursor(&qd.arrow);

            CopyRgn(arrowRgn, region);

        }

        DisposeRgn(arrowRgn);

        DisposeRgn(iBeamRgn);

    }

} /*AdjustCursor*/

/*  Get the global coordinates of the mouse. When you call OSEventAvail

    it will return either a pending event or a null event. In either case,

    the where field of the event record will contain the current position

    of the mouse in global coordinates and the modifiers field will reflect

    the current state of the modifiers. Another way to get the global

    coordinates is to call GetMouse and LocalToGlobal, but that requires

    being sure that thePort is set to a valid port. */

#pragma segment Main

void GetGlobalMouse(mouse)

    Point   *mouse;

{

    EventRecord event;

    OSEventAvail(kNoEvents, &event);    /* we aren't interested in any events */

    *mouse = event.where;               /* just the mouse position */

} /*GetGlobalMouse*/

/*  Called when a mouseDown occurs in the grow box of an active window. In

    order to eliminate any 'flicker', we want to invalidate only what is

    necessary. Since ResizeWindow invalidates the whole portRect, we save

    the old TE viewRect, intersect it with the new TE viewRect, and

    remove the result from the update region. However, we must make sure

    that any old update region that might have been around gets put back. */

#pragma segment Main

void DoGrowWindow(window,event)

    WindowPtr   window;

    EventRecord *event;

{

    long        growResult;

    Rect        tempRect;

    RgnHandle   tempRgn;

    DocumentPeek doc;

    tempRect = qd.screenBits.bounds;                    /* set up limiting values */

    tempRect.left = kMinDocDim;

    tempRect.top = kMinDocDim;

    growResult = GrowWindow(window, event->where, &tempRect);

    /* see if it really changed size */

    if ( growResult != 0 ) {

        doc = (DocumentPeek) window;

        tempRect = (*doc->docTE)->viewRect;             /* save old text box */

        tempRgn = NewRgn();

        GetLocalUpdateRgn(window, tempRgn);             /* get localized update region */

        SizeWindow(window, LoWrd(growResult), HiWrd(growResult), true);

        ResizeWindow(window);

        /* calculate & validate the region that hasnÕt changed so it wonÕt get redrawn */

        SectRect(&tempRect, &(*doc->docTE)->viewRect, &tempRect);

        ValidRect(&tempRect);                           /* take it out of update */

        InvalRgn(tempRgn);                              /* put back any prior update */

        DisposeRgn(tempRgn);

    }

} /* DoGrowWindow */

/*  Called when a mouseClick occurs in the zoom box of an active window.

    Everything has to get re-drawn here, so we don't mind that

    ResizeWindow invalidates the whole portRect. */

#pragma segment Main

void DoZoomWindow(window,part)

    WindowPtr   window;

    short       part;

{

    EraseRect(&window->portRect);

    ZoomWindow(window, part, window == FrontWindow());

    ResizeWindow(window);

} /*  DoZoomWindow */

/* Called when the window has been resized to fix up the controls and content. */

#pragma segment Main

void ResizeWindow(window)

    WindowPtr   window;

{

    CGrafPtr savedPort;   /* Saves the current port for later restoring */

    GDHandle savedDevice; /* Saves the current GDevice for later restoring */

    AdjustScrollbars(window, true);

    AdjustTE(window);

    InvalRect(&window->portRect);

    /* Resize the background image to the new size of the window */

    GetGWorld( /*<*/&savedPort, /*<*/&savedDevice );

    UpdateGWorld( &((DocumentPeek)window)->docImage, 0, &window->portRect, nil, nil, 0 );

    SetGWorld( ((DocumentPeek)window)->docImage, nil );

    PaintImage();

    SetGWorld( savedPort, savedDevice );

} /* ResizeWindow */

/* Returns the update region in local coordinates */

#pragma segment Main

void GetLocalUpdateRgn(window,localRgn)

    WindowPtr   window;

    RgnHandle   localRgn;

{

    CopyRgn(((WindowPeek) window)->updateRgn, localRgn);    /* save old update region */

    OffsetRgn(localRgn, window->portBits.bounds.left, window->portBits.bounds.top);

} /* GetLocalUpdateRgn */

/*  This is called when an update event is received for a window.

    It calls DrawWindow to draw the contents of an application window.

    As an efficiency measure that does not have to be followed, it

    calls the drawing routine only if the visRgn is non-empty. This

    will handle situations where calculations for drawing or drawing

    itself is very time-consuming. */

#pragma segment Main

void DoUpdate(window)

    WindowPtr   window;

{

    if ( IsAppWindow(window) ) {

        BeginUpdate(window);                /* this sets up the visRgn */

        if ( ! EmptyRgn(window->visRgn) )   /* draw if updating needs to be done */

            DrawWindow(window);

        EndUpdate(window);

    }

} /*DoUpdate*/

static void PaintImage()

{

    CGrafPtr  savedPort;    /* Pointer to saved CGrafPort for later restoring */

    GDHandle  savedGDevice; /* Handle to saved GDevice for later restoring */

    RGBColor  rampColor;    /* Color to use when drawing a step of the ramp */

    short     maxRampCount; /* Number of pixels in a ramp */

    short     rampWidth;    /* Width of each ramp in pixels */

    short     rampFactor;   /* Value to set a color component to in a ramp */

    short     pinFactor;    /* Value to pin a color component to in a ramp */

    short     x;            /* Horizontal coordinate to draw ramp step */

    short     y;            /* Vertical coordinate to draw ramp step */

    GetGWorld( /*<*/&savedPort, /*<*/&savedGDevice );

    /* Pin component values at $0000 first, then at $FFFF */

    maxRampCount = savedPort->portRect.bottom - savedPort->portRect.top;

    rampWidth = (savedPort->portRect.right - savedPort->portRect.left) / 16;

    for (pinFactor = 0; pinFactor >= -1; pinFactor--)

    {

        /* Loop on y coordinate over entire GrafPort */

        for (y = 0; y < maxRampCount; y++)

        {

            /* Calculate value of components that are dynamic in a ramp */

            rampFactor = y * 65535 / maxRampCount;

            if (pinFactor == -1)

            {

                /* If pinning at $FFFF, then use oneÕs comp of rampFactor */

                rampFactor ^= 0xFFFF;

                x = rampWidth;

            }

            else

                x = 0;

            rampColor.red = rampFactor;

            rampColor.green = rampFactor;

            rampColor.blue = rampFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

            x += rampWidth * 2;

            rampColor.blue = pinFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

            x += rampWidth * 2;

            rampColor.green = pinFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

            x += rampWidth * 2;

            rampColor.blue = rampFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

            x += rampWidth * 2;

            rampColor.red = pinFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

            x += rampWidth * 2;

            rampColor.green = rampFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

            x += rampWidth * 2;

            rampColor.blue = pinFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

            x += rampWidth * 2;

            rampColor.green = pinFactor;

            RGBForeColor( &rampColor );

            MoveTo( x, y );

            Line( rampWidth, 0 );

        }

    }

}

/*  This is called when a window is activated or deactivated.

    It calls TextEdit to deal with the selection. */

#pragma segment Main

void DoActivate(window, becomingActive)

    WindowPtr   window;

    Boolean     becomingActive;

{

    RgnHandle   tempRgn, clipRgn;

    Rect        growRect;

    DocumentPeek doc;

    if ( IsAppWindow(window) ) {

        doc = (DocumentPeek) window;

        if ( becomingActive ) {

            /*  since we donÕt want TEActivate to draw a selection in an area where

                weÕre going to erase and redraw, weÕll clip out the update region

                before calling it. */

            tempRgn = NewRgn();

            clipRgn = NewRgn();

            GetLocalUpdateRgn(window, tempRgn);         /* get localized update region */

            GetClip(clipRgn);

            DiffRgn(clipRgn, tempRgn, tempRgn);         /* subtract updateRgn from clipRgn */

            SetClip(tempRgn);

            TEActivate(doc->docTE);

            SetClip(clipRgn);                           /* restore the full-blown clipRgn */

            DisposeRgn(tempRgn);

            DisposeRgn(clipRgn);

            /* the controls must be redrawn on activation: */

            (*doc->docVScroll)->contrlVis = kControlVisible;

            (*doc->docHScroll)->contrlVis = kControlVisible;

            InvalRect(&(*doc->docVScroll)->contrlRect);

            InvalRect(&(*doc->docHScroll)->contrlRect);

            /* the growbox needs to be redrawn on activation: */

            growRect = window->portRect;

            /* adjust for the scrollbars */

            growRect.top = growRect.bottom - kScrollbarAdjust;

            growRect.left = growRect.right - kScrollbarAdjust;

            InvalRect(&growRect);

        }

        else {      

            TEDeactivate(doc->docTE);

            /* the controls must be hidden on deactivation: */

            HideControl(doc->docVScroll);

            HideControl(doc->docHScroll);

            /* the growbox should be changed immediately on deactivation: */

            DrawGrowIcon(window);

        }

    }

} /*DoActivate*/

/*  This is called when a mouseDown occurs in the content of a window. */

#pragma segment Main

void DoContentClick(window,event)

    WindowPtr   window;

    EventRecord *event;

{

    Point       mouse;

    ControlHandle control;

    short       part, value;

    Boolean     shiftDown;

    DocumentPeek doc;

    Rect        teRect;

    if ( IsAppWindow(window) ) {

        SetPort(window);

        mouse = event->where;                           /* get the click position */

        GlobalToLocal(&mouse);

        doc = (DocumentPeek) window;

        /* see if we are in the viewRect. if so, we wonÕt check the controls */

        GetTERect(window, &teRect);

        if ( PtInRect(mouse, &teRect) ) {

            /* see if we need to extend the selection */

            shiftDown = (event->modifiers & shiftKey) != 0; /* extend if Shift is down */

            TEClick(mouse, shiftDown, doc->docTE);

        } else {

            part = FindControl(mouse, window, &control);

            switch ( part ) {

                case 0:                         /* do nothing for viewRect case */

                    break;

                case inThumb:

                    value = GetCtlValue(control);

                    part = TrackControl(control, mouse, nil);

                    if ( part != 0 ) {

                        value -= GetCtlValue(control);

                        /* value now has CHANGE in value; if value changed, scroll */

                        if ( value != 0 )

                            if ( control == doc->docVScroll )

                                TEScroll(0, value * (*doc->docTE)->lineHeight, doc->docTE);

                            else

                                TEScroll(value, 0, doc->docTE);

                    }

                    break;

                default:                        /* they clicked in an arrow, so track & scroll */

                    if ( control == doc->docVScroll )

                        value = TrackControl(control, mouse, gVActionUPP);

                    else

                        value = TrackControl(control, mouse, gHActionUPP);

                    break;

            }

        }

    }

} /*DoContentClick*/

/* This is called for any keyDown or autoKey events, except when the

 Command key is held down. It looks at the frontmost window to decide what

 to do with the key typed. */

#pragma segment Main

void DoKeyDown(event)

    EventRecord *event;

{

    WindowPtr   window;

    char        key;

    TEHandle    te;

    window = FrontWindow();

    if ( IsAppWindow(window) ) {

        te = ((DocumentPeek) window)->docTE;

        key = event->message & charCodeMask;

        /* we have a char. for our window; see if we are still below TextEditÕs

            limit for the number of characters (but deletes are always rad) */

        if ( key == kDelChar ||

                (*te)->teLength - ((*te)->selEnd - (*te)->selStart) + 1 <

                kMaxTELength ) {

            TEKey(key, te);

            AdjustScrollbars(window, false);

            AdjustTE(window);

        } else

            AlertUser(eExceedChar);

    }

} /*DoKeyDown*/

/*  Calculate a sleep value for WaitNextEvent. This takes into account the things

    that DoIdle does with idle time. */

#pragma segment Main

unsigned long GetSleep()

{

    long        sleep;

    WindowPtr   window;

    TEHandle    te;

    sleep = 60;                     /* default value for sleep */

    if ( !gInBackground ) {

        window = FrontWindow();         /* and the front window is ours... */

        if ( IsAppWindow(window) ) {

            te = ((DocumentPeek) (window))->docTE;  /* and the selection is an insertion point... */

            if ( (*te)->selStart == (*te)->selEnd )

                sleep = GetCaretTime();     /* blink time for the insertion point */

        }

    }

    return sleep;

} /*GetSleep*/

/*  Common algorithm for pinning the value of a control. It returns the actual amount

    the value of the control changed. Note the pinning is done for the sake of returning

    the amount the control value changed. */

#pragma segment Main

void CommonAction(control,amount)

    ControlHandle control;

    short       *amount;

{

    short       value, max;

    value = GetCtlValue(control);   /* get current value */

    max = GetCtlMax(control);       /* and maximum value */

    *amount = value - *amount;

    if ( *amount < 0 )

        *amount = 0;

    else if ( *amount > max )

        *amount = max;

    SetCtlValue(control, *amount);

    *amount = value - *amount;      /* calculate the real change */

} /* CommonAction */

/* Determines how much to change the value of the vertical scrollbar by and how

    much to scroll the TE record. */

#pragma segment Main

pascal void VActionProc(control,part)

    ControlHandle control;

    short       part;

{

    short       amount;

    WindowPtr   window;

    TEPtr       te;

    if ( part != 0 ) {              /* if it was actually in the control */

        window = (*control)->contrlOwner;

        te = *((DocumentPeek) window)->docTE;

        switch ( part ) {

            case inUpButton:

            case inDownButton:      /* one line */

                amount = 1;

                break;

            case inPageUp:          /* one page */

            case inPageDown:

                amount = (te->viewRect.bottom - te->viewRect.top) / te->lineHeight;

                break;

        }

        if ( (part == inDownButton) || (part == inPageDown) )

            amount = -amount;       /* reverse direction for a downer */

        CommonAction(control, &amount);

        if ( amount != 0 )

            TEScroll(0, amount * te->lineHeight, ((DocumentPeek) window)->docTE);

    }

} /* VActionProc */

/* Determines how much to change the value of the horizontal scrollbar by and how

much to scroll the TE record. */

#pragma segment Main

pascal void HActionProc(control,part)

    ControlHandle control;

    short       part;

{

    short       amount;

    WindowPtr   window;

    TEPtr       te;

    if ( part != 0 ) {

        window = (*control)->contrlOwner;

        te = *((DocumentPeek) window)->docTE;

        switch ( part ) {

            case inUpButton:

            case inDownButton:      /* a few pixels */

                amount = kButtonScroll;

                break;

            case inPageUp:          /* a page */

            case inPageDown:

                amount = te->viewRect.right - te->viewRect.left;

                break;

        }

        if ( (part == inDownButton) || (part == inPageDown) )

            amount = -amount;       /* reverse direction */

        CommonAction(control, &amount);

        if ( amount != 0 )

            TEScroll(amount, 0, ((DocumentPeek) window)->docTE);

    }

} /* VActionProc */

/* This is called whenever we get a null event et al.

 It takes care of necessary periodic actions. For this program, it calls TEIdle. */

#pragma segment Main

void DoIdle()

{

    WindowPtr   window;

    window = FrontWindow();

    if ( IsAppWindow(window) )

        TEIdle(((DocumentPeek) window)->docTE);

} /*DoIdle*/

/* Draw the contents of an application window. */

#pragma segment Main

void DrawWindow(window)

    WindowPtr   window;

{

    SetPort(window);

    EraseRect( &window->portRect );

    DrawControls(window);

    DrawGrowIcon(window);

    TEUpdate(&window->portRect, ((DocumentPeek) window)->docTE);

} /*DrawWindow*/

/*  Enable and disable menus based on the current state.

    The user can only select enabled menu items. We set up all the menu items

    before calling MenuSelect or MenuKey, since these are the only times that

    a menu item can be selected. Note that MenuSelect is also the only time

    the user will see menu items. This approach to deciding what enable/

    disable state a menu item has the advantage of concentrating all

    the decision-making in one routine, as opposed to being spread throughout

    the application. Other application designs may take a different approach

    that may or may not be as valid. */

#pragma segment Main

void AdjustMenus()

{

    WindowPtr   window;

    MenuHandle  menu;

    long        offset;

    Boolean     undo;

    Boolean     cutCopyClear;

    Boolean     paste;

    TEHandle    te;

    window = FrontWindow();

    menu = GetMHandle(mFile);

    if ( gNumDocuments < kMaxOpenDocuments )

        EnableItem(menu, iNew);     /* New is enabled when we can open more documents */

    else

        DisableItem(menu, iNew);

    if ( window != nil )            /* Close is enabled when there is a window to close */

        EnableItem(menu, iClose);

    else

        DisableItem(menu, iClose);

    menu = GetMHandle(mEdit);

    undo = false;

    cutCopyClear = false;

    paste = false;

    if ( IsDAWindow(window) ) {

        undo = true;                /* all editing is enabled for DA windows */

        cutCopyClear = true;

        paste = true;

    } else if ( IsAppWindow(window) ) {

        te = ((DocumentPeek) window)->docTE;

        if ( (*te)->selStart < (*te)->selEnd )

            cutCopyClear = true;

            /* Cut, Copy, and Clear is enabled for app. windows with selections */

        if ( GetScrap(nil, 'TEXT', &offset)  > 0)

            paste = true;           /* if thereÕs any text in the clipboard, paste is enabled */

    }

    if ( undo )

        EnableItem(menu, iUndo);

    else

        DisableItem(menu, iUndo);

    if ( cutCopyClear ) {

        EnableItem(menu, iCut);

        EnableItem(menu, iCopy);

        EnableItem(menu, iClear);

    } else {

        DisableItem(menu, iCut);

        DisableItem(menu, iCopy);

        DisableItem(menu, iClear);

    }

    if ( paste )

        EnableItem(menu, iPaste);

    else

        DisableItem(menu, iPaste);

} /*AdjustMenus*/

/*  This is called when an item is chosen from the menu bar (after calling

    MenuSelect or MenuKey). It does the right thing for each command. */

#pragma segment Main

void DoMenuCommand(menuResult)

    long        menuResult;

{

    short       menuID, menuItem;

    short       itemHit, daRefNum;

    Str255      daName;

    OSErr       saveErr;

    TEHandle    te;

    WindowPtr   window;

    Handle      aHandle;

    long        oldSize, newSize;

    long        total, contig;

    window = FrontWindow();

    menuID = HiWord(menuResult);    /* use macros for efficiency to... */

    menuItem = LoWord(menuResult);  /* get menu item number and menu number */

    switch ( menuID ) {

        case mApple:

            switch ( menuItem ) {

                case iAbout:        /* bring up alert for About */

                    itemHit = Alert(rAboutAlert, nil);

                    break;

                default:            /* all non-About items in this menu are DAs et al */

                    /* type Str255 is an array in MPW 3 */

                    GetItem(GetMHandle(mApple), menuItem, daName);

                    daRefNum = OpenDeskAcc(daName);

                    break;

            }

            break;

        case mFile:

            switch ( menuItem ) {

                case iNew:

                    DoNew();

                    break;

                case iClose:

                    DoCloseWindow(FrontWindow());           /* ignore the result */

                    break;

                case iQuit:

                    Terminate();

                    break;

            }

            break;

        case mEdit:                 /* call SystemEdit for DA editing & MultiFinder */

            if ( !SystemEdit(menuItem-1) ) {

                te = ((DocumentPeek) FrontWindow())->docTE;

                switch ( menuItem ) {

                    case iCut:

                        if ( ZeroScrap() == noErr ) {

                            PurgeSpace(&total, &contig);

                            if ((*te)->selEnd - (*te)->selStart + kTESlop > contig)

                                AlertUser(eNoSpaceCut);

                            else 

                                {

                                TECut(te);

                                if ( TEToScrap() != noErr ) {

                                    AlertUser(eNoCut);

                                    ZeroScrap();

                                }

                            }

                        }

                        break;

                    case iCopy:

                        if ( ZeroScrap() == noErr ) {

                            TECopy(te); /* after copying, export the TE scrap */

                            if ( TEToScrap() != noErr ) {

                                AlertUser(eNoCopy);

                                ZeroScrap();

                            }

                        }

                        break;

                    case iPaste:    /* import the TE scrap before pasting */

                        if ( TEFromScrap() == noErr ) {

                            if ( TEGetScrapLen() + ((*te)->teLength -

                                ((*te)->selEnd - (*te)->selStart)) > kMaxTELength )

                                AlertUser(eExceedPaste);

                            else {

                                aHandle = (Handle) TEGetText(te);

                                oldSize = GetHandleSize(aHandle);

                                newSize = oldSize + TEGetScrapLen() + kTESlop;

                                SetHandleSize(aHandle, newSize);

                                saveErr = MemError();

                                SetHandleSize(aHandle, oldSize);

                                if (saveErr != noErr)

                                    AlertUser(eNoSpacePaste);

                                else

                                    TEPaste(te);

                            }

                        }

                        else

                            AlertUser(eNoPaste);

                        break;

                    case iClear:

                        TEDelete(te);

                        break;

                }

            AdjustScrollbars(window, false);

            AdjustTE(window);

            }

            break;

    }

    HiliteMenu(0);                  /* unhighlight what MenuSelect (or MenuKey) hilited */

} /*DoMenuCommand*/

pascal void CustomRect(

    GrafVerb verb,      /* Operation to perform */

    Rect     *destRect) /* Rectangle to be drawn */

{

    GrafPtr   currPort;          /* Port that this bottleneck is attached to */

    GWorldPtr backImage;         /* The windowÕs background image */

    TEHandle  docText;           /* DocumentÕs TextEdit record */

    RgnHandle clippedDestRgn;    /* Region that covers clippedDestRect area */

    RgnHandle destRectRgn;       /* Region that covers destRect */

    Rect      textRect;          /* Copy of the TextEdit recordÕs viewRect */

    Rect      clippedDestRect;   /* Rectangle to copy GWorld into */

    Rect      clippedSourceRect; /* Rectangle to copy GWorld image from */

    short     horzOffset;        /* Horizontal offset of destRect from viewRect */

    short     vertOffset;        /* Vertical offset of destRect from viewRect */

    if (verb == erase)

    {

        /* Get the documentÕs background image and TextEdit record */

        GetPort( /*<*/&currPort );

        backImage = ((DocumentPeek)currPort)->docImage;

        docText = ((DocumentPeek)currPort)->docTE;

        textRect = (**docText).viewRect;

        /* Get the amount that the TextEdit record is scrolled */

        horzOffset = textRect.left - (**docText).destRect.left;

        vertOffset = textRect.top - (**docText).destRect.top;

        /* Source rect is dest rect scrolled, clipped to viewRect and off-screen port */

        clippedSourceRect = *destRect;

        SectRect( &clippedSourceRect, &textRect, /*<*/&clippedSourceRect );

        OffsetRect( /*×*/&clippedSourceRect, horzOffset, vertOffset );

        SectRect( &clippedSourceRect, &backImage->portRect, /*<*/&clippedSourceRect );

        /* Dest rect is clipped to viewRect and same size and source rect */

        clippedDestRect = *destRect;

        SectRect( &clippedDestRect, &textRect, /*<*/&clippedDestRect );

        clippedDestRect.right = clippedDestRect.left + (clippedSourceRect.right -

                clippedSourceRect.left);

        clippedDestRect.bottom = clippedDestRect.top + (clippedSourceRect.bottom -

                clippedSourceRect.top);

        /* Draw the background instead of erasing */

        CopyBits( &((GrafPtr)backImage)->portBits, &currPort->portBits,

                &clippedSourceRect, &clippedDestRect,

                srcCopy, nil );

        /* Erase the area outside of the area of the background */

        clippedDestRgn = NewRgn();

        destRectRgn = NewRgn();

        RectRgn( clippedDestRgn, &clippedDestRect );

        RectRgn( destRectRgn, destRect );

        DiffRgn( destRectRgn, clippedDestRgn, clippedDestRgn );

        StdRgn( erase, clippedDestRgn );

        DisposeRgn( clippedDestRgn );

        DisposeRgn( destRectRgn );

    }

    else if (verb == invert)

    {

        /* Turn off colored hilighting so that we can see something */

        *((char *)0x0938) |= 0x80;

        StdRect( verb, destRect );

    }

    else

        /* Nothing special; just call original bottleneck */

        StdRect( verb, destRect );

}

pascal void CustomRgn(

    GrafVerb  verb,    /* Operation to perform */

    RgnHandle destRgn) /* Region to be drawn */

{

    GrafPtr   currPort;          /* Port that this bottleneck is attached to */

    GWorldPtr backImage;         /* The windowÕs background image */

    TEHandle  docText;           /* DocumentÕs TextEdit record */

    Rect      textRect;          /* Copy of the TextEdit recordÕs viewRect */

    Rect      clippedDestRect;   /* Rectangle to copy GWorld into */

    Rect      clippedSourceRect; /* Rectangle to copy GWorld image from */

    Rect      destRect;          /* Rectangle that circumscribes destRgn */

    short     horzOffset;        /* Horizontal offset of destRect from viewRect */

    short     vertOffset;        /* Vertical offset of destRect from viewRect */

    if (verb == erase)

    {

        /* Get the documentÕs background image and TextEdit record */

        GetPort( /*<*/&currPort );

        backImage = ((DocumentPeek)currPort)->docImage;

        docText = ((DocumentPeek)currPort)->docTE;

        textRect = (**docText).viewRect;

        destRect = (**destRgn).rgnBBox;

        /* Get the amount that the TextEdit record is scrolled */

        horzOffset = textRect.left - (**docText).destRect.left;

        vertOffset = textRect.top - (**docText).destRect.top;

        /* Source rect is dest rect scrolled, clipped to viewRect and off-screen port */

        clippedSourceRect = destRect;

        SectRect( &clippedSourceRect, &textRect, /*<*/&clippedSourceRect );

        OffsetRect( /*×*/&clippedSourceRect, horzOffset, vertOffset );

        SectRect( &clippedSourceRect, &backImage->portRect, /*<*/&clippedSourceRect );

        /* Dest rect is clipped to viewRect and same size and source rect */

        clippedDestRect = destRect;

        SectRect( &clippedDestRect, &textRect, /*<*/&clippedDestRect );

        clippedDestRect.right = clippedDestRect.left + (clippedSourceRect.right -

                clippedSourceRect.left);

        clippedDestRect.bottom = clippedDestRect.top + (clippedSourceRect.bottom -

                clippedSourceRect.top);

        /* Draw the background instead of erasing */

        CopyBits( &((GrafPtr)backImage)->portBits, &currPort->portBits,

                &clippedSourceRect, &clippedDestRect,

                srcCopy, destRgn );

    }

    else

        StdRgn( verb, destRgn );

}

/* Create a new document and window. */

#pragma segment Main

void DoNew()

{

    Boolean     good;

    Ptr         storage;

    WindowPtr   window;

    Rect        destRect, viewRect;

    DocumentPeek doc;

    CGrafPtr    savedPort;

    GDHandle    savedDevice;

    QDErr       error;

    QDProcsPtr  customProcs;

    storage = NewPtr(sizeof(DocumentRecord));

    if ( storage != nil ) {

        window = GetNewWindow(rDocWindow, storage, (WindowPtr) -1);

        if ( window != nil ) {

            gNumDocuments += 1;         /* this will be decremented when we call DoCloseWindow */

            good = false;

            SetPort(window);

            doc =  (DocumentPeek) window;

            GetTERect(window, &viewRect);

            destRect = viewRect;

            destRect.right = destRect.left + kMaxDocWidth;

            doc->docTE = TENew(&destRect, &viewRect);

            good = doc->docTE != nil;   /* if TENew succeeded, we have a good document */

            if ( good ) {               /* 1.02 - good document? Ñ proceed */

                AdjustViewRect(doc->docTE);

                TEAutoView(true, doc->docTE);

                doc->docClick = (ProcPtr) (*doc->docTE)->clickLoop;

                #if powerc

                TESetClickLoop(gClickLoopUPP, doc->docTE);

                #else

                (*doc->docTE)->clickLoop = (TEClickLoopUPP) AsmClickLoopProc;

                #endif

            }

            /* Create the GWorld to use as the background image */

            GetGWorld( &savedPort, &savedDevice );

            error = NewGWorld( &doc->docImage, 0, &window->portRect, nil, nil, 0 );

            good = error == noErr;

            if (good)

            {

                /* Draw the image of ramps into the GWorld */

                SetGWorld( doc->docImage, nil );

                PaintImage();

                SetGWorld( savedPort, savedDevice );

                /* Allocate and initialize bottleneck routines */

                customProcs = (QDProcsPtr)NewPtr( sizeof (QDProcs) );

                SetStdProcs(customProcs );

                customProcs->rectProc = gQDRectUPP;

                customProcs->rgnProc = gQDRgnUPP;

                /* Install our bottlenecks into the window */

                window->grafProcs = customProcs;

            }

            if ( good ) {               /* good document? Ñ get scrollbars */

                doc->docVScroll = GetNewControl(rVScroll, window);

                good = (doc->docVScroll != nil);

            }

            if ( good) {

                doc->docHScroll = GetNewControl(rHScroll, window);

                good = (doc->docHScroll != nil);

            }

            if ( good ) {               /* good? Ñ adjust & draw the controls, draw the window */

                /* false to AdjustScrollValues means musnÕt redraw; technically, of course,

                the window is hidden so it wouldnÕt matter whether we called ShowControl or not. */

                AdjustScrollValues(window, false);

                ShowWindow(window);

            } else {

                DoCloseWindow(window);  /* otherwise regret we ever created it... */

                AlertUser(eNoWindow);           /* and tell user */

            }

        } else

            DisposPtr(storage);         /* get rid of the storage if it is never used */

    }

} /*DoNew*/

/* Close a window. This handles desk accessory and application windows. */

/*  1.01 - At this point, if there was a document associated with a

    window, you could do any document saving processing if it is 'dirty'.

    DoCloseWindow would return true if the window actually closed, i.e.,

    the user didnÕt cancel from a save dialog. This result is handy when

    the user quits an application, but then cancels the save of a document

    associated with a window. */

#pragma segment Main

Boolean DoCloseWindow(window)

    WindowPtr   window;

{

    TEHandle    te;

    if ( IsDAWindow(window) )

        CloseDeskAcc(((WindowPeek) window)->windowKind);

    else if ( IsAppWindow(window) ) {

        te = ((DocumentPeek) window)->docTE;

        if ( te != nil )

            TEDispose(te);          /* dispose the TEHandle if we got far enough to make one */

        /*  1.01 - We used to call DisposeWindow, but that was technically

            incorrect, even though we allocated storage for the window on

            the heap. We should instead call CloseWindow to have the structures

            taken care of and then dispose of the storage ourselves. */

        CloseWindow(window);

        DisposPtr((Ptr) window);

        gNumDocuments -= 1;

    }

    return true;

} /*DoCloseWindow*/

/**************************************************************************************

*** 1.01 DoCloseBehind(window) was removed ***

    1.01 - DoCloseBehind was a good idea for closing windows when quitting

    and not having to worry about updating the windows, but it suffered

    from a fatal flaw. If a desk accessory owned two windows, it would

    close both those windows when CloseDeskAcc was called. When DoCloseBehind

    got around to calling DoCloseWindow for that other window that was already

    closed, things would go very poorly. Another option would be to have a

    procedure, GetRearWindow, that would go through the window list and return

    the last window. Instead, we decided to present the standard approach

    of getting and closing FrontWindow until FrontWindow returns NIL. This

    has a potential benefit in that the window whose document needs to be saved

    may be visible since it is the front window, therefore decreasing the

    chance of user confusion. For aesthetic reasons, the windows in the

    application should be checked for updates periodically and have the

    updates serviced.

**************************************************************************************/

/* Clean up the application and exit. We close all of the windows so that

 they can update their documents, if any. */

/*  1.01 - If we find out that a cancel has occurred, we won't exit to the

    shell, but will return instead. */

#pragma segment Main

void Terminate()

{

    WindowPtr   aWindow;

    Boolean     closed;

    closed = true;

    do {

        aWindow = FrontWindow();                /* get the current front window */

        if (aWindow != nil)

            closed = DoCloseWindow(aWindow);    /* close this window */ 

    }

    while (closed && (aWindow != nil));

    if (closed)

        ExitToShell();                          /* exit if no cancellation */

} /*Terminate*/

/*  Set up the whole world, including global variables, Toolbox managers,

    menus, and a single blank document. */

/*  1.01 - The code that used to be part of ForceEnvirons has been moved into

    this module. If an error is detected, instead of merely doing an ExitToShell,

    which leaves the user without much to go on, we call AlertUser, which puts

    up a simple alert that just says an error occurred and then calls ExitToShell.

    Since there is no other cleanup needed at this point if an error is detected,

    this form of error- handling is acceptable. If more sophisticated error recovery

    is needed, an exception mechanism, such as is provided by Signals, can be used. */

#pragma segment Initialize

void Initialize()

{

    Handle  menuBar;

    long    total, contig;

    EventRecord event;

    short   count;

    gInBackground = false;

    InitGraf((Ptr) &qd.thePort);

    InitFonts();

    InitWindows();

    InitMenus();

    TEInit();

    InitDialogs(nil);

    InitCursor();

    /*  Call MPPOpen and ATPLoad at this point to initialize AppleTalk,

        if you are using it. */

    /*  NOTE -- It is no longer necessary, and actually unhealthy, to check

        PortBUse and SPConfig before opening AppleTalk. The drivers are capable

        of checking for port availability themselves. */

    /*  This next bit of code is necessary to allow the default button of our

        alert be outlined.

        1.02 - Changed to call EventAvail so that we don't lose some important

        events. */

    for (count = 1; count <= 3; count++)

        EventAvail(everyEvent, &event);

    /*  Ignore the error returned from SysEnvirons; even if an error occurred,

        the SysEnvirons glue will fill in the SysEnvRec. You can save a redundant

        call to SysEnvirons by calling it after initializing AppleTalk. */

    SysEnvirons(kSysEnvironsVersion, &gMac);

    /* Make sure that the machine has at least 128K ROMs. If it doesn't, exit. */

    if (gMac.machineType < 0) BigBadError(eWrongMachine);

    /*  1.02 - Move TrapAvailable call to after SysEnvirons so that we can tell

        in TrapAvailable if a tool trap value is out of range. */

    gHasWaitNextEvent = TrapAvailable(_WaitNextEvent);

    /*  1.01 - We used to make a check for memory at this point by examining ApplLimit,

        ApplicZone, and StackSpace and comparing that to the minimum size we told

        MultiFinder we needed. This did not work well because it assumed too much about

        the relationship between what we asked MultiFinder for and what we would actually

        get back, as well as how to measure it. Instead, we will use an alternate

        method comprised of two steps. */

    /*  It is better to first check the size of the application heap against a value

        that you have determined is the smallest heap the application can reasonably

        work in. This number should be derived by examining the size of the heap that

        is actually provided by MultiFinder when the minimum size requested is used.

        The derivation of the minimum size requested from MultiFinder is described

        in Sample.h. The check should be made because the preferred size can end up

        being set smaller than the minimum size by the user. This extra check acts to

        insure that your application is starting from a solid memory foundation. */

    if ((long) GetApplLimit() - (long) ApplicZone() < kMinHeap) BigBadError(eSmallSize);

    /*  Next, make sure that enough memory is free for your application to run. It

        is possible for a situation to arise where the heap may have been of required

        size, but a large scrap was loaded which left too little memory. To check for

        this, call PurgeSpace and compare the result with a value that you have determined

        is the minimum amount of free memory your application needs at initialization.

        This number can be derived several different ways. One way that is fairly

        straightforward is to run the application in the minimum size configuration

        as described previously. Call PurgeSpace at initialization and examine the value

        returned. However, you should make sure that this result is not being modified

        by the scrap's presence. You can do that by calling ZeroScrap before calling

        PurgeSpace. Make sure to remove that call before shipping, though. */

    /* ZeroScrap(); */

    PurgeSpace(&total, &contig);

    if (total < kMinSpace)

        if (UnloadScrap() != noErr)

            BigBadError(eNoMemory);

        else {

            PurgeSpace(&total, &contig);

            if (total < kMinSpace)

                BigBadError(eNoMemory);

        }

    /*  The extra benefit to waiting until after the Toolbox Managers have been initialized

        to check memory is that we can now give the user an alert to tell them what

        happened. Although it is possible that the memory situation could be worsened by

        displaying an alert, MultiFinder would gracefully exit the application with

        an informative alert if memory became critical. Here we are acting more

        in a preventative manner to avoid future disaster from low-memory problems. */

    menuBar = GetNewMBar(rMenuBar);         /* read menus into menu bar */

    if ( menuBar == nil )

                BigBadError(eNoMemory);

    SetMenuBar(menuBar);                    /* install menus */

    DisposHandle(menuBar);

    AddResMenu(GetMHandle(mApple), 'DRVR'); /* add DA names to Apple menu */

    DrawMenuBar();

    gNumDocuments = 0;

    /* set up the UPP for our ClikLoop if we are compiling for PowerPC */

    #if powerc

    gClickLoopUPP = NewTEClickLoopProc(ClickLoopProc);

    #endif

    /* set up the UPPs for our scroll bar tracking */

    gHActionUPP = NewControlActionProc(HActionProc);

    gVActionUPP = NewControlActionProc(VActionProc);

    /* finally the UPPs for the QD routines */

    gQDRectUPP   =  NewQDRectProc(CustomRect);

    gQDRgnUPP    =  NewQDRgnProc(CustomRgn);

    /* do other initialization here */

    DoNew();                                /* create a single empty document */

} /*Initialize*/

/* Used whenever a, like, fully fatal error happens */

#pragma segment Initialize

void BigBadError(error)

    short error;

{

    AlertUser(error);

    ExitToShell();

}

/* Return a rectangle that is inset from the portRect by the size of

    the scrollbars and a little extra margin. */

#pragma segment Main

void GetTERect(window,teRect)

    WindowPtr   window;

    Rect        *teRect;

{

    *teRect = window->portRect;

    InsetRect(teRect, kTextMargin, kTextMargin);    /* adjust for margin */

    teRect->bottom = teRect->bottom - 15;       /* and for the scrollbars */

    teRect->right = teRect->right - 15;

} /*GetTERect*/

/* Update the TERec's view rect so that it is the greatest multiple of

    the lineHeight that still fits in the old viewRect. */

#pragma segment Main

void AdjustViewRect(docTE)

    TEHandle    docTE;

{

    TEPtr       te;

    te = *docTE;

    /* te->viewRect.bottom = (((te->viewRect.bottom - te->viewRect.top) / te->lineHeight)

                            * te->lineHeight) + te->viewRect.top; */

} /*AdjustViewRect*/

/* Scroll the TERec around to match up to the potentially updated scrollbar

    values. This is really useful when the window has been resized such that the

    scrollbars became inactive but the TERec was already scrolled. */

#pragma segment Main

void AdjustTE(window)

    WindowPtr   window;

{

    TEPtr       te;

    te = *((DocumentPeek)window)->docTE;

    TEScroll((te->viewRect.left - te->destRect.left) -

            GetCtlValue(((DocumentPeek)window)->docHScroll),

            (te->viewRect.top - te->destRect.top) -

                (GetCtlValue(((DocumentPeek)window)->docVScroll) *

                te->lineHeight),

            ((DocumentPeek)window)->docTE);

} /*AdjustTE*/

/* Calculate the new control maximum value and current value, whether it is the horizontal or

    vertical scrollbar. The vertical max is calculated by comparing the number of lines to the

    vertical size of the viewRect. The horizontal max is calculated by comparing the maximum document

    width to the width of the viewRect. The current values are set by comparing the offset between

    the view and destination rects. If necessary and we canRedraw, have the control be re-drawn by

    calling ShowControl. */

#pragma segment Main

void AdjustHV(isVert,control,docTE,canRedraw)

    Boolean     isVert;

    ControlHandle control;

    TEHandle    docTE;

    Boolean     canRedraw;

{

    short       value, lines, max;

    short       oldValue, oldMax;

    TEPtr       te;

    oldValue = GetCtlValue(control);

    oldMax = GetCtlMax(control);

    te = *docTE;                            /* point to TERec for convenience */

    if ( isVert ) {

        lines = te->nLines;

        /* since nLines isnÕt right if the last character is a return, check for that case */

        if ( *(*te->hText + te->teLength - 1) == kCrChar )

            lines += 1;

        max = lines - ((te->viewRect.bottom - te->viewRect.top) /

                te->lineHeight);

    } else

        max = kMaxDocWidth - (te->viewRect.right - te->viewRect.left);

    if ( max < 0 ) max = 0;

    SetCtlMax(control, max);

    /* Must deref. after SetCtlMax since, technically, it could draw and therefore move

        memory. This is why we donÕt just do it once at the beginning. */

    te = *docTE;

    if ( isVert )

        value = (te->viewRect.top - te->destRect.top) / te->lineHeight;

    else

        value = te->viewRect.left - te->destRect.left;

    if ( value < 0 ) value = 0;

    else if ( value >  max ) value = max;

    SetCtlValue(control, value);

    /* now redraw the control if it needs to be and can be */

    if ( canRedraw || (max != oldMax) || (value != oldValue) )

        ShowControl(control);

} /*AdjustHV*/

/* Simply call the common adjust routine for the vertical and horizontal scrollbars. */

#pragma segment Main

void AdjustScrollValues(window,canRedraw)

    WindowPtr   window;

    Boolean     canRedraw;

{

    DocumentPeek doc;

    doc = (DocumentPeek)window;

    AdjustHV(true, doc->docVScroll, doc->docTE, canRedraw);

    AdjustHV(false, doc->docHScroll, doc->docTE, canRedraw);

} /*AdjustScrollValues*/

/*  Re-calculate the position and size of the viewRect and the scrollbars.

    kScrollTweek compensates for off-by-one requirements of the scrollbars

    to have borders coincide with the growbox. */

#pragma segment Main

void AdjustScrollSizes(window)

    WindowPtr   window;

{

    Rect        teRect;

    DocumentPeek doc;

    doc = (DocumentPeek) window;

    GetTERect(window, &teRect);                         /* start with TERect */

    (*doc->docTE)->viewRect = teRect;

    AdjustViewRect(doc->docTE);                         /* snap to nearest line */

    MoveControl(doc->docVScroll, window->portRect.right - kScrollbarAdjust, -1);

    SizeControl(doc->docVScroll, kScrollbarWidth, (window->portRect.bottom - 

                window->portRect.top) - (kScrollbarAdjust - kScrollTweek));

    MoveControl(doc->docHScroll, -1, window->portRect.bottom - kScrollbarAdjust);

    SizeControl(doc->docHScroll, (window->portRect.right - 

                window->portRect.left) - (kScrollbarAdjust - kScrollTweek),

                kScrollbarWidth);

} /*AdjustScrollSizes*/

/* Turn off the controls by jamming a zero into their contrlVis fields (HideControl erases them

    and we don't want that). If the controls are to be resized as well, call the procedure to do that,

    then call the procedure to adjust the maximum and current values. Finally re-enable the controls

    by jamming a $FF in their contrlVis fields. */

#pragma segment Main

void AdjustScrollbars(window,needsResize)

    WindowPtr   window;

    Boolean     needsResize;

{

    DocumentPeek doc;

    doc = (DocumentPeek) window;

    /* First, turn visibility of scrollbars off so we wonÕt get unwanted redrawing */

    (*doc->docVScroll)->contrlVis = kControlInvisible;  /* turn them off */

    (*doc->docHScroll)->contrlVis = kControlInvisible;

    if ( needsResize )                                  /* move & size as needed */

        AdjustScrollSizes(window);

    AdjustScrollValues(window, needsResize);            /* fool with max and current value */

    /* Now, restore visibility in case we never had to ShowControl during adjustment */

    (*doc->docVScroll)->contrlVis = kControlVisible;    /* turn them on */

    (*doc->docHScroll)->contrlVis = kControlVisible;

} /* AdjustScrollbars */

// When the user selects text by dragging, TextEdit repeatedly calls a click loop routine which

// it gets from the TERecord's clikLoop field. TextEdit's default routine does some useful things,

// such as scrolling the text being selected, but it doesn't know about our scroll bars.

// Therefore, we replace the routine with one that calls both the old routine and an add-on routine

// which handles the scroll bars. Unfortunately, the way this works is very different for 68K and

// PowerPC. On 68K, we have to be aware that the original click loop routine has a register-based

// interface, so our replacement is easier to write in assembly. For PowerPC, we can let routine

// descriptors handle the argument conversions, and do everything in the C routine ClickLoopProc.

#if powerc

pascal Boolean ClickLoopProc(TEPtr pTE)

{

    CallTEClickLoopProc(GetOldClickLoop(), pTE);

    ClickLoopAddOn();

    return true;

}

#endif

// The ClickLoopAddOn routine handles the scroll bars during drag-scrolling.

pascal void ClickLoopAddOn(void)

{

    WindowPtr   window;

    RgnHandle   region;

    window = FrontWindow();

    region = NewRgn();

    GetClip(region);                    /* save clip */

    ClipRect(&window->portRect);

    AdjustScrollValues(window, true);   /* pass true for canRedraw */

    SetClip(region);                    /* restore clip */

    DisposeRgn(region);

}

// GetOldClickLoop returns the address of the default click loop routine that we put into the

// TERec when creating it.

pascal TEClickLoopUPP GetOldClickLoop(void)

{

    return ((DocumentPeek)FrontWindow())->docClick;

}

/*  Check to see if a window belongs to the application. If the window pointer

    passed was NIL, then it could not be an application window. WindowKinds

    that are negative belong to the system and windowKinds less than userKind

    are reserved by Apple except for windowKinds equal to dialogKind, which

    mean it is a dialog.

    1.02 - In order to reduce the chance of accidentally treating some window

    as an AppWindow that shouldn't be, we'll only return true if the windowkind

    is userKind. If you add different kinds of windows to Sample you'll need

    to change how this all works. */

#pragma segment Main

Boolean IsAppWindow(window)

    WindowPtr   window;

{

    short       windowKind;

    if ( window == nil )

        return false;

    else {  /* application windows have windowKinds = userKind (8) */

        windowKind = ((WindowPeek) window)->windowKind;

        return (windowKind == userKind);

    }

} /*IsAppWindow*/

/* Check to see if a window belongs to a desk accessory. */

#pragma segment Main

Boolean IsDAWindow(window)

    WindowPtr   window;

{

    if ( window == nil )

        return false;

    else    /* DA windows have negative windowKinds */

        return ((WindowPeek) window)->windowKind < 0;

} /*IsDAWindow*/

// check to see if a given trap is implemented. We follow IM VI-3-8.

Boolean TrapAvailable(short theTrap)

{

    TrapType theTrapType;

    short numToolboxTraps;

    if ((theTrap & 0x0800) > 0)

        theTrapType = ToolTrap;

    else

        theTrapType = OSTrap;

    if (theTrapType == ToolTrap)

    {

        theTrap = theTrap & 0x07ff;

        if (NGetTrapAddress(_InitGraf, ToolTrap) == NGetTrapAddress(0xaa6e, ToolTrap))

            numToolboxTraps = 0x0200;

        else

            numToolboxTraps = 0x0400;

        if (theTrap >= numToolboxTraps)

            theTrap = _Unimplemented;

    };

    return (NGetTrapAddress(theTrap, theTrapType) != NGetTrapAddress(_Unimplemented, ToolTrap));

}

/*  Display an alert that tells the user an error occurred, then exit the program.

    This routine is used as an ultimate bail-out for serious errors that prohibit

    the continuation of the application. Errors that do not require the termination

    of the application should be handled in a different manner. Error checking and

    reporting has a place even in the simplest application. The error number is used

    to index an 'STR#' resource so that a relevant message can be displayed. */

#pragma segment Main

void AlertUser(error)

    short       error;

{

    short       itemHit;

    Str255      message;

    SetCursor(&qd.arrow);

    /* type Str255 is an array in MPW 3 */

    GetIndString(message, kErrStrings, error);

    ParamText(message, "", "", "");

    itemHit = Alert(rUserAlert, nil);

} /* AlertUser */