/*

    File:       MyDeviceLoop.c

    Contains:   This snippet shows how to write a device loop that          

                works under System 7 and pre-7.0 systems.  As               

                described on pages 21-23 and 21-24 of Inside Mac            

                volume VI, a device loop procedure searches all             

                active screen devices, calling a drawing procedure          

                whenever it encounters a screen that intersects         

                the drawing region.  In this app the drawing                

                region is the app's window bounds and the chosen            

                drawing procedure simply displays the screen's              

                colors for every device the window bounds intersect.        

    Written by: EL  

    Copyright:  Copyright © 1992-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                08/2000     JM              Carbonized, non-Carbon code is commented out

                                            for demonstration purposes.

                7/12/1999   KG              Updated for Metrowerks Codewarror Pro 2.1

*/

#include "CarbonPrefix.h"

#include <Dialogs.h>

#include <Fonts.h>

/* Constant Declarations */

#define WWIDTH      400

#define WHEIGHT     256

//#define WLEFT     (((qd.screenBits.bounds.right - qd.screenBits.bounds.left) - WWIDTH) / 2)

//#define WTOP      (((qd.screenBits.bounds.bottom - qd.screenBits.bounds.top) - WHEIGHT) / 2)

enum PointSelector {topLeft,

            botRight};

/* Global Variable Definitions */

WindowPtr   gWindow;

void initMac();

void createWindow();

void doMyDeviceLoop();

void doDraw();

void doEventLoop();

void main(void)

{

    initMac();

    createWindow();

    doEventLoop();

}

void initMac()

{

    /*MaxApplZone();

    InitGraf( &qd.thePort );

    InitFonts();

    InitWindows();

    InitMenus();

    TEInit();

    InitDialogs( nil );*/

    InitCursor();

    FlushEvents( 0, everyEvent );

}

void createWindow()

{

    Rect rect;

    BitMap  bitMap;

    int top, left;

    GetQDGlobalsScreenBits(&bitMap);

    top = (((bitMap.bounds.bottom - bitMap.bounds.top) - WHEIGHT) / 2);

    left = (((bitMap.bounds.right - bitMap.bounds.left) - WWIDTH) / 2);

    //SetRect( &rect, WLEFT, WTOP, WLEFT + WWIDTH, WTOP + WHEIGHT );

    SetRect( &rect, left, top, left + WWIDTH, top + WHEIGHT );

    gWindow = NewCWindow( 0L, &rect, "\pMyDeviceLoop", true, documentProc,

                            (WindowPtr)-1L, true, 0L );                     

    //SetPort( gWindow );

    SetPortWindowPort( gWindow );

    TextFont( kFontIDTimes );

    TextSize( 48 );

    TextMode( srcCopy );

}

// Old version of doMyDeviceLoop, new version capable of supporting multiple monitors

/*

void doMyDeviceLoop()

{

    int         depth;

    Rect        gDeviceRect;

    Rect        intersectingRect;

    GDHandle    gDevice;

    //Point     point;

    Rect        tempRect1;

    // Get the handle to the first device in the list. 

    gDevice = GetDeviceList();

    // Loop through all the devices in the list. 

    while (gDevice != nil)

    {

        // Get the device's gdRect and convert it to local coordinates. 

        gDeviceRect = (**gDevice).gdRect;

        depth = (**(**gDevice).gdPMap).pixelSize;

        GlobalToLocal( topLeft );

        GlobalToLocal( (Point *)botRight );

        // Check if the app's window rect intersects the device's, and if it 

        //  does, set the clip region's rect to the intersection, then DRAW! 

        //if (SectRect( &gWindow->portRect, &gDeviceRect, &intersectingRect ))

        if (SectRect( GetPortBounds(GetWindowPort(gWindow), &tempRect1), &gDeviceRect, &intersectingRect ))

        {

            ClipRect( &intersectingRect );

            doDraw( depth, &intersectingRect );

        }

        // Get the next device in the list. 

        gDevice = GetNextDevice( gDevice );

    }

}

*/

// New doMyDeviceLoop, now works with multiple monitors

void doMyDeviceLoop()

{

    int             depth;

    Rect            gDeviceRect;

    Rect            intersectingRect;

    GDHandle        gDevice;

    //WindowRecord  *windowRec = (WindowRecord *)gWindow;

    WindowPtr       windowRec = gWindow;

    Rect            windowRect; //= (**windowRec->contRgn).rgnBBox;

    RgnHandle       rgnHandle = NewRgn();

    GetWindowRegion(windowRec, kWindowContentRgn, rgnHandle);

    GetRegionBounds(rgnHandle, &windowRect);

    // Get the handle to the first device in the list. 

    gDevice = GetDeviceList();

    // Loop through all the devices in the list. 

    while (gDevice != nil)

    {

        // Get the device's gdRect  */

        gDeviceRect = (**gDevice).gdRect;

        depth = (**(**gDevice).gdPMap).pixelSize;

        // Check if the app's window rect intersects the device's, and if it 

        // does, set the clip region's rect to the intersection, then DRAW! 

        if (SectRect( &windowRect, &gDeviceRect, &intersectingRect ))

        {

            // The intersectingRect is in global coords. Convert to local 

            GlobalToLocal((Point *)&intersectingRect.top);

            GlobalToLocal((Point *)&intersectingRect.bottom);

            ClipRect( &intersectingRect );

            doDraw( depth, &intersectingRect );

        }

        // Get the next device in the list. 

        gDevice = GetNextDevice( gDevice );

    }

    DisposeRgn(rgnHandle);

}

void doDraw( depth)

int     depth;

{

    int             i;

    int             totalColors;

    int             penThickness;

    //RGBColor      color;

    CTabHandle      ctable;

    Str255          string = "\pDirect Colors";

    Rect            tempRect1;

    if (depth > 8)

    {

        BackColor( blackColor );

        ForeColor( blueColor );

        /* Draw text for direct colors mode. */

        //EraseRect( &gWindow->portRect );

        EraseRect( GetPortBounds(GetWindowPort(gWindow), &tempRect1));

        //MoveTo( (gWindow->portRect.right - StringWidth( string )) / 2, 130 );

        MoveTo((GetPortBounds(GetWindowPort(gWindow), &tempRect1)->right - StringWidth(string)) / 2, 130);

        DrawString( string );

    }

    else

    {

        /* Get the colortable at this depth. */

        ctable = GetCTable( depth );

        /* Set the line thickness to a fraction of the window height. */

        totalColors = (2 << depth) / 2;

        //penThickness = gWindow->portRect.bottom / totalColors;

        penThickness = GetPortBounds(GetWindowPort(gWindow), &tempRect1)->bottom / totalColors;

        PenSize( 1, penThickness );

        /* Now draw the colors at this depth. */

        for (i = 0; i < totalColors; i++)

        {

            RGBForeColor( &(**ctable).ctTable[i].rgb );

            MoveTo( 0, i * penThickness );

            //LineTo( gWindow->portRect.right, i * penThickness );

            LineTo(GetPortBounds(GetWindowPort(gWindow), &tempRect1)->right, i * penThickness);

        }

        /* Release the colortable memory. */

        DisposeCTable( ctable );

    }

}

void doEventLoop()

{

    EventRecord event;

    WindowPtr   window;

    short       clickArea;

    Rect        screenRect;

    for (;;)

    {

        if (WaitNextEvent( everyEvent, &event, 0, nil ))

        {

            if (event.what == mouseDown)

            {

                clickArea = FindWindow( event.where, &window );

                if (clickArea == inDrag)

                {

                    //screenRect = (**GetGrayRgn()).rgnBBox;

                    GetRegionBounds(GetGrayRgn(), &screenRect);

                    DragWindow( window, event.where, &screenRect );

                }

                else if (clickArea == inContent)

                {

                    if (window != FrontWindow())

                        SelectWindow( window );

                }

                else if (clickArea == inGoAway)

                    if (TrackGoAway( window, event.where ))

                        return;

            }

            else if (event.what == updateEvt)

            {

                window = (WindowPtr)event.message;  

                //SetPort( window );

                SetPortWindowPort( window );

                BeginUpdate( window );

                doMyDeviceLoop();

                EndUpdate( window );

            }

        }

    }

}