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- /*
- 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.
-
- In consideration of your agreement to abide by the following terms, and subject
- to these terms, Apple grants you a personal, non-exclusive license, under Apple’s
- copyrights in this original Apple software (the "Apple Software"), to use,
- reproduce, modify and redistribute the Apple Software, with or without
- modifications, in source and/or binary forms; provided that if you redistribute
- the Apple Software in its entirety and without modifications, you must retain
- this notice and the following text and disclaimers in all such redistributions of
- the Apple Software. Neither the name, trademarks, service marks or logos of
- Apple Computer, Inc. may be used to endorse or promote products derived from the
- Apple Software without specific prior written permission from Apple. Except as
- expressly stated in this notice, no other rights or licenses, express or implied,
- are granted by Apple herein, including but not limited to any patent rights that
- may be infringed by your derivative works or by other works in which the Apple
- Software may be incorporated.
-
- The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
- WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
- WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
- COMBINATION WITH YOUR PRODUCTS.
-
- IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
- OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
- (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- 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);
- }
-
-