1 /* 2 * Copyright 2004-2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef DATA_EDITOR_H 6 #define DATA_EDITOR_H 7 8 9 #include <File.h> 10 #include <Entry.h> 11 #include <Locker.h> 12 #include <ObjectList.h> 13 14 class BHandler; 15 class BLooper; 16 class BMessenger; 17 18 class DataChange; 19 class StateWatcher; 20 21 22 class DataEditor : public BLocker { 23 public: 24 DataEditor(); 25 DataEditor(entry_ref &ref, const char *attribute = NULL); 26 DataEditor(BEntry &entry, const char *attribute = NULL); 27 DataEditor(const DataEditor &editor); 28 ~DataEditor(); 29 30 status_t SetTo(const char *path, const char *attribute = NULL); 31 status_t SetTo(entry_ref &ref, const char *attribute = NULL); 32 status_t SetTo(BEntry &entry, const char *attribute = NULL); 33 34 status_t Save(); 35 36 bool IsReadOnly() const { return fIsReadOnly; } 37 bool IsDevice() const { return fIsDevice; } 38 bool IsAttribute() const { return fAttribute != NULL; } 39 bool IsModified() const { return fLastChange != fFirstChange; } 40 41 const char *Attribute() const { return fAttribute; } 42 type_code Type() const { return fType; } 43 44 status_t InitCheck(); 45 46 status_t Replace(off_t offset, const uint8 *data, size_t length); 47 status_t Remove(off_t offset, off_t length); 48 status_t Insert(off_t offset, const uint8 *data, size_t length); 49 50 status_t MoveBy(int32 bytes); 51 status_t MoveTo(off_t offset); 52 53 status_t Undo(); 54 status_t Redo(); 55 56 bool CanUndo() const; 57 bool CanRedo() const; 58 59 status_t SetFileSize(off_t size); 60 off_t FileSize() const { return fSize; } 61 62 status_t SetViewOffset(off_t offset); 63 off_t ViewOffset() const { return fViewOffset; } 64 65 status_t SetViewSize(size_t size); 66 size_t ViewSize() const { return fViewSize; } 67 68 status_t SetBlockSize(size_t size); 69 size_t BlockSize() const { return fBlockSize; } 70 71 status_t UpdateIfNeeded(bool *_updated = NULL); 72 status_t ForceUpdate(); 73 status_t GetViewBuffer(const uint8 **_buffer); 74 75 status_t StartWatching(BMessenger target); 76 status_t StartWatching(BHandler *handler, BLooper *looper = NULL); 77 void StopWatching(BMessenger target); 78 void StopWatching(BHandler *handler, BLooper *looper = NULL); 79 80 off_t Find(off_t startPosition, const uint8 *data, size_t dataSize, 81 bool caseInsensitive, bool cyclic, 82 BMessenger progressMessenger, volatile bool *stop = NULL); 83 84 BFile &File() { return fFile; } 85 const entry_ref &AttributeRef() const { return fAttributeRef; } 86 const entry_ref &Ref() const { return fRef; } 87 88 private: 89 friend class StateWatcher; 90 91 status_t SetViewOffset(off_t offset, bool sendNotices); 92 status_t SetViewSize(size_t size, bool sendNotices); 93 void SendNotices(uint32 what, BMessage *message = NULL); 94 void SendNotices(DataChange *change); 95 status_t Update(); 96 void AddChange(DataChange *change); 97 void ApplyChanges(); 98 void RemoveRedos(); 99 100 BObjectList<BMessenger> fObservers; 101 102 entry_ref fRef, fAttributeRef; 103 BFile fFile; 104 const char *fAttribute; 105 type_code fType; 106 bool fIsDevice, fIsReadOnly; 107 off_t fRealSize, fSize; 108 109 BObjectList<DataChange> fChanges; 110 DataChange *fFirstChange; 111 DataChange *fLastChange; 112 int32 fChangesFromSaved; 113 114 uint8 *fView; 115 off_t fRealViewOffset, fViewOffset; 116 size_t fRealViewSize, fViewSize; 117 bool fNeedsUpdate; 118 119 size_t fBlockSize; 120 }; 121 122 static const uint32 kMsgDataEditorStateChange = 'deSC'; 123 static const uint32 kMsgDataEditorUpdate = 'deUp'; 124 static const uint32 kMsgDataEditorParameterChange = 'dePC'; 125 126 static const uint32 kMsgDataEditorFindProgress = 'deFP'; 127 128 #endif /* DATA_EDITOR_H */ 129