/*

    File:       DragCode.c

    Description:Code that works with the Drag Manager to support drag and drop of pictures.

                Incoming drags only at this point.

    Author:     MC

    Copyright:  © Copyright 1999-2000 Apple Computer, Inc. All rights reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

                use, installation, modification or redistribution of this Apple software

                constitutes acceptance of these terms.  If you do not agree with these terms,

                please do not use, install, modify or redistribute this Apple software.

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                to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs

                copyrights in this original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or without

                modifications, in source and/or binary forms; provided that if you redistribute

                the Apple Software in its entirety and without modifications, you must retain

                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

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    Change History (most recent first):

*/

#define TARGET_API_MAC_CARBON 1

#include <Drag.h>

#include <QuickTimeComponents.h>

#include <Windows.h>

#include "DragCode.h"

#include "GraphicImportDrawCode.h"

#include "Structs.h"

#include "Defines.h"

#include "WindowCode.h"

// Globals

        Boolean         canAcceptDrag;

extern  OSErr           gErr;

extern  OSType *        gAcceptedFlavorTypes;

extern  long            gNumGIComponents;

static Boolean CanWeAcceptThis (DragReference theDrag) {

    unsigned short          items,

                            index;

    FlavorFlags             theFlags;

    ItemReference           theItem;

    OSErr                   err;

    short                   i;

    err = CountDragItems (theDrag, &items);

    if (err == noErr) {

        for (index = 1; index <= items; index++) {

            err = GetDragItemReferenceNumber (theDrag, index, &theItem);

            if (err == noErr) {

                i = 0;

                while (i <= gNumGIComponents) {

                    err = GetFlavorFlags (theDrag, theItem, gAcceptedFlavorTypes[i++], &theFlags);

                    if (err == noErr) {

                        return (true);

                    }

                }

            }

        }

    }

    return (false);

}

static Boolean GoodType (OSType theType) {

    Boolean                 isGood;

    short                   i;

    isGood = false;

    i = 0;

    do {

        if (theType == gAcceptedFlavorTypes[i++])

            isGood = true;

    } while (isGood == false && i <= gNumGIComponents);

    return isGood;

}

pascal OSErr MyDefaultTrackingHandler (DragTrackingMessage theMessage, WindowPtr theWindow, void* handlerRefCon, DragReference theDrag) {

#pragma unused (handlerRefCon)

    OSErr                       err;

    Rect                        winRect;

    err = noErr;

    switch (theMessage) {

        case kDragTrackingEnterHandler:

            break;

        case kDragTrackingEnterWindow:

            canAcceptDrag = CanWeAcceptThis (theDrag);

            if (canAcceptDrag == true) {

                RgnHandle   winRgn = NewRgn (),

                            insetWinRgn = NewRgn (),

                            borderRgn = NewRgn ();

                GetWindowPortBounds (theWindow, &winRect);

                RectRgn (winRgn, &winRect);

                RectRgn (insetWinRgn, &winRect);

                InsetRgn (insetWinRgn, 2, 2);

                DiffRgn (winRgn, insetWinRgn, borderRgn);

                EraseRgn (borderRgn);

                InvalWindowRgn (theWindow, borderRgn);

                ShowDragHilite (theDrag, winRgn, true);

                DisposeRgn (winRgn);

                DisposeRgn (insetWinRgn);

                DisposeRgn (borderRgn);             

            }

            break;

        case kDragTrackingInWindow:

            if (canAcceptDrag == false) {

                break;

            } else {

                // do whatever inside the window (like move an insertion point)

            }

            break;

        case kDragTrackingLeaveWindow:

            if (canAcceptDrag == true) {

                HideDragHilite (theDrag);

            }

            canAcceptDrag = false;

            break;

        case kDragTrackingLeaveHandler:

            break;

    }

    return err;

}

pascal OSErr MyDefaultReceiveHandler (WindowPtr theWindow, void* handlerRefCon, DragReference theDrag) {

#pragma unused (handlerRefCon)

    unsigned short              items,

                                index;

    ItemReference               theItem;

    OSType                      theType;

    unsigned short              flavorNum;

    Size                        dataSize;

    WindowInfoHandle            winInfo;

    SInt8                       handleState;                        

    if (theWindow != nil) {

        winInfo = (WindowInfoHandle)GetWRefCon (theWindow);

    }

    if (winInfo != nil && (**winInfo).sig == kMySig) {

        if (canAcceptDrag == true) {

            gErr = CountDragItems (theDrag, &items);

            for (index = 1; index <= items; index++) {

                gErr = GetDragItemReferenceNumber (theDrag, index, &theItem);

                flavorNum = 1;

                do {

                    gErr = GetFlavorType (theDrag, theItem, flavorNum++, &theType);

                } while (gErr == noErr && GoodType (theType) == false);

                if (gErr == noErr) {

                    GetFlavorDataSize (theDrag, theItem, theType, &dataSize);

                    if (dataSize > 0) {

                        handleState = HGetState ((Handle)winInfo);

                        HLock ((Handle)winInfo);

                        ReleaseMemory (winInfo, false);

                        (**winInfo).winGraphicType = theType;

                        if (theType == 'PICT') {

                            (**winInfo).winDataHandle = TempNewHandle (dataSize + 512, &gErr);

                        } else {

                            (**winInfo).winDataHandle = TempNewHandle (dataSize, &gErr);

                        }

                        if ((**winInfo).winDataHandle != nil) {

                            if (theType == 'PICT') {

                                gErr = GetFlavorData (theDrag, theItem, theType, *(**winInfo).winDataHandle + 512, &dataSize, 0);

                            } else {

                                gErr = GetFlavorData (theDrag, theItem, theType, *(**winInfo).winDataHandle, &dataSize, 0);

                            }

                        } else {

                            gErr = cantGetFlavorErr;

                        }

                        if (gErr == noErr) {

                            gErr = DrawHandle (theWindow);

                        }

                        HSetState ((Handle)winInfo, handleState);

                    }

                }

            }

        }

    }

    return gErr;

}

OSErr InitDragManager (void) {

    OSErr                       err;

    DragTrackingHandlerUPP      MyDefaultTrackingHandlerUPP;

    DragReceiveHandlerUPP       MyDefaultReceiveHandlerUPP;

    MyDefaultTrackingHandlerUPP = NewDragTrackingHandlerProc (MyDefaultTrackingHandler);

    err = InstallTrackingHandler (MyDefaultTrackingHandlerUPP, 0L, nil);

    if (err == noErr) {

        MyDefaultReceiveHandlerUPP = NewDragReceiveHandlerProc (MyDefaultReceiveHandler);

        err = InstallReceiveHandler (MyDefaultReceiveHandlerUPP, 0L, nil);

    }

    return (err);

}