1 /* 2 * Copyright 2004-2007, 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 BMessage; 17 class BMessenger; 18 19 class DataChange; 20 class StateWatcher; 21 22 23 class DataEditor : public BLocker { 24 public: 25 DataEditor(); 26 DataEditor(entry_ref &ref, const char *attribute = NULL); 27 DataEditor(BEntry &entry, const char *attribute = NULL); 28 DataEditor(const DataEditor &editor); 29 ~DataEditor(); 30 31 status_t SetTo(const char *path, const char *attribute = NULL); 32 status_t SetTo(entry_ref &ref, const char *attribute = NULL); 33 status_t SetTo(BEntry &entry, const char *attribute = NULL); 34 35 status_t Save(); 36 37 bool IsReadOnly() const { return fIsReadOnly; } 38 bool IsDevice() const { return fIsDevice; } 39 bool IsAttribute() const { return fAttribute != NULL; } 40 bool IsModified() const { return fLastChange != fFirstChange; } 41 42 const char *Attribute() const { return fAttribute; } 43 type_code Type() const { return fType; } 44 45 status_t InitCheck(); 46 47 status_t Replace(off_t offset, const uint8 *data, size_t length, 48 bool sendNotices = true); 49 status_t Remove(off_t offset, off_t length); 50 status_t Insert(off_t offset, const uint8 *data, size_t length); 51 52 status_t MoveBy(int32 bytes); 53 status_t MoveTo(off_t offset); 54 55 status_t Undo(); 56 status_t Redo(); 57 58 bool CanUndo() const; 59 bool CanRedo() const; 60 61 status_t SetFileSize(off_t size); 62 off_t FileSize() const { return fSize; } 63 64 status_t SetViewOffset(off_t offset); 65 off_t ViewOffset() const { return fViewOffset; } 66 67 status_t SetViewSize(size_t size); 68 size_t ViewSize() const { return fViewSize; } 69 70 status_t SetBlockSize(size_t size); 71 size_t BlockSize() const { return fBlockSize; } 72 73 status_t UpdateIfNeeded(bool *_updated = NULL); 74 status_t ForceUpdate(); 75 status_t GetViewBuffer(const uint8 **_buffer); 76 77 status_t StartWatching(BMessenger target); 78 status_t StartWatching(BHandler *handler, BLooper *looper = NULL); 79 void StopWatching(BMessenger target); 80 void StopWatching(BHandler *handler, BLooper *looper = NULL); 81 82 off_t Find(off_t startPosition, const uint8 *data, size_t dataSize, 83 bool caseInsensitive, bool cyclic, 84 BMessenger progressMessenger, volatile bool *stop = NULL); 85 86 BFile &File() { return fFile; } 87 const entry_ref &AttributeRef() const { return fAttributeRef; } 88 const entry_ref &Ref() const { return fRef; } 89 90 private: 91 friend class StateWatcher; 92 93 status_t SetViewOffset(off_t offset, bool sendNotices); 94 status_t SetViewSize(size_t size, bool sendNotices); 95 void SendNotices(uint32 what, BMessage *message = NULL); 96 void SendNotices(DataChange *change); 97 status_t Update(); 98 void AddChange(DataChange *change, bool sendNotices = true); 99 void ApplyChanges(); 100 void RemoveRedos(); 101 102 BObjectList<BMessenger> fObservers; 103 104 entry_ref fRef, fAttributeRef; 105 BFile fFile; 106 const char *fAttribute; 107 type_code fType; 108 bool fIsDevice, fIsReadOnly; 109 off_t fRealSize, fSize; 110 111 BObjectList<DataChange> fChanges; 112 DataChange *fFirstChange; 113 DataChange *fLastChange; 114 int32 fChangesFromSaved; 115 116 uint8 *fView; 117 off_t fRealViewOffset, fViewOffset; 118 size_t fRealViewSize, fViewSize; 119 bool fNeedsUpdate; 120 121 size_t fBlockSize; 122 }; 123 124 static const uint32 kMsgDataEditorStateChange = 'deSC'; 125 static const uint32 kMsgDataEditorUpdate = 'deUp'; 126 static const uint32 kMsgDataEditorParameterChange = 'dePC'; 127 128 static const uint32 kMsgDataEditorFindProgress = 'deFP'; 129 130 #endif /* DATA_EDITOR_H */ 131