include/wx/fswatcher.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/fswatcher.h
   3 // Purpose:     wxFileSystemWatcherBase
   4 // Author:      Bartosz Bekier
   5 // Created:     2009-05-23
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2009 Bartosz Bekier <bartosz.bekier@gmail.com>
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_FSWATCHER_BASE_H_
  12 #define _WX_FSWATCHER_BASE_H_
  13
  14 #include "wx/defs.h"
  15
  16 #if wxUSE_FSWATCHER
  17
  18 #include "wx/log.h"
  19 #include "wx/event.h"
  20 #include "wx/evtloop.h"
  21 #include "wx/filename.h"
  22 #include "wx/dir.h"
  23 #include "wx/hashmap.h"
  24
  25 #define wxTRACE_FSWATCHER "fswatcher"
  26
  27 // ----------------------------------------------------------------------------
  28 // wxFileSystemWatcherEventType & wxFileSystemWatcherEvent
  29 // ----------------------------------------------------------------------------
  30
  31 /**
  32  * Possible types of file system events.
  33  * This is a subset that will work fine an all platforms (actually, we will
  34  * see how it works on Mac).
  35  *
  36  * We got 2 types of error events:
  37  * - warning: these are not fatal and further events can still be generated
  38  * - error: indicates fatal error and causes that no more events will happen
  39  */
  40 enum
  41 {
  42     wxFSW_EVENT_CREATE = 0x01,
  43     wxFSW_EVENT_DELETE = 0x02,
  44     wxFSW_EVENT_RENAME = 0x04,
  45     wxFSW_EVENT_MODIFY = 0x08,
  46     wxFSW_EVENT_ACCESS = 0x10,
  47
  48     // error events
  49     wxFSW_EVENT_WARNING = 0x20,
  50     wxFSW_EVENT_ERROR = 0x40,
  51
  52     wxFSW_EVENT_ALL = wxFSW_EVENT_CREATE | wxFSW_EVENT_DELETE |
  53                          wxFSW_EVENT_RENAME | wxFSW_EVENT_MODIFY |
  54                          wxFSW_EVENT_ACCESS |
  55                          wxFSW_EVENT_WARNING | wxFSW_EVENT_ERROR
  56 };
  57
  58 // Type of the path watched, used only internally for now.
  59 enum wxFSWPathType
  60 {
  61     wxFSWPath_None,     // Invalid value for an initialized watch.
  62     wxFSWPath_File,     // Plain file.
  63     wxFSWPath_Dir,      // Watch a directory and the files in it.
  64     wxFSWPath_Tree      // Watch a directory and all its children recursively.
  65 };
  66
  67
  68 /**
  69  * Event containing information about file system change.
  70  */
  71 class WXDLLIMPEXP_FWD_BASE wxFileSystemWatcherEvent;
  72 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_BASE, wxEVT_FSWATCHER,
  73                          wxFileSystemWatcherEvent);
  74
  75 class WXDLLIMPEXP_BASE wxFileSystemWatcherEvent: public wxEvent
  76 {
  77 public:
  78     wxFileSystemWatcherEvent(int changeType, int watchid = wxID_ANY) :
  79         wxEvent(watchid, wxEVT_FSWATCHER),
  80         m_changeType(changeType)
  81     {
  82     }
  83
  84     wxFileSystemWatcherEvent(int changeType, const wxString& errorMsg,
  85                              int watchid = wxID_ANY) :
  86         wxEvent(watchid, wxEVT_FSWATCHER),
  87         m_changeType(changeType), m_errorMsg(errorMsg)
  88     {
  89     }
  90
  91     wxFileSystemWatcherEvent(int changeType,
  92                              const wxFileName& path, const wxFileName& newPath,
  93                              int watchid = wxID_ANY) :
  94          wxEvent(watchid, wxEVT_FSWATCHER),
  95          m_changeType(changeType), m_path(path), m_newPath(newPath)
  96     {
  97     }
  98
  99     /**
 100      * Returns the path at which the event occurred.
 101      */
 102     const wxFileName& GetPath() const
 103     {
 104         return m_path;
 105     }
 106
 107     /**
 108      * Sets the path at which the event occurred
 109      */
 110     void SetPath(const wxFileName& path)
 111     {
 112         m_path = path;
 113     }
 114
 115     /**
 116      * In case of rename(move?) events, returns the new path related to the
 117      * event. The "new" means newer in the sense of time. In case of other
 118      * events it returns the same path as GetPath().
 119      */
 120     const wxFileName& GetNewPath() const
 121     {
 122         return m_newPath;
 123     }
 124
 125     /**
 126      * Sets the new path related to the event. See above.
 127      */
 128     void SetNewPath(const wxFileName& path)
 129     {
 130         m_newPath = path;
 131     }
 132
 133     /**
 134      * Returns the type of file system event that occurred.
 135      */
 136     int GetChangeType() const
 137     {
 138         return m_changeType;
 139     }
 140
 141     virtual wxEvent* Clone() const
 142     {
 143         wxFileSystemWatcherEvent* evt = new wxFileSystemWatcherEvent(*this);
 144         evt->m_errorMsg = m_errorMsg.Clone();
 145         evt->m_path = wxFileName(m_path.GetFullPath().Clone());
 146         evt->m_newPath = wxFileName(m_newPath.GetFullPath().Clone());
 147         return evt;
 148     }
 149
 150     virtual wxEventCategory GetEventCategory() const
 151     {
 152         // TODO this has to be merged with "similiar" categories and changed
 153         return wxEVT_CATEGORY_UNKNOWN;
 154     }
 155
 156     /**
 157      * Returns if this error is an error event
 158      */
 159     bool IsError() const
 160     {
 161         return (m_changeType & (wxFSW_EVENT_ERROR | wxFSW_EVENT_WARNING)) != 0;
 162     }
 163
 164     wxString GetErrorDescription() const
 165     {
 166         return m_errorMsg;
 167     }
 168
 169     /**
 170      * Returns a wxString describing an event useful for debugging or testing
 171      */
 172     wxString ToString() const;
 173
 174 protected:
 175     int m_changeType;
 176     wxFileName m_path;
 177     wxFileName m_newPath;
 178     wxString m_errorMsg;
 179 };
 180
 181 typedef void (wxEvtHandler::*wxFileSystemWatcherEventFunction)
 182                                                 (wxFileSystemWatcherEvent&);
 183
 184 #define wxFileSystemWatcherEventHandler(func) \
 185     wxEVENT_HANDLER_CAST(wxFileSystemWatcherEventFunction, func)
 186
 187
 188 // ----------------------------------------------------------------------------
 189 // wxFileSystemWatcherBase: interface for wxFileSystemWatcher
 190 // ----------------------------------------------------------------------------
 191
 192 // Simple container to store information about one watched path.
 193 class wxFSWatchInfo
 194 {
 195 public:
 196     wxFSWatchInfo() :
 197         m_events(-1), m_type(wxFSWPath_None)
 198     {
 199     }
 200
 201     wxFSWatchInfo(const wxString& path, int events, wxFSWPathType type) :
 202         m_path(path), m_events(events), m_type(type)
 203     {
 204     }
 205
 206     const wxString& GetPath() const
 207     {
 208         return m_path;
 209     }
 210
 211     int GetFlags() const
 212     {
 213         return m_events;
 214     }
 215
 216     wxFSWPathType GetType() const
 217     {
 218         return m_type;
 219     }
 220
 221 protected:
 222     wxString m_path;
 223     int m_events;
 224     wxFSWPathType m_type;
 225 };
 226
 227 WX_DECLARE_STRING_HASH_MAP(wxFSWatchInfo, wxFSWatchInfoMap);
 228
 229 /**
 230  * Encapsulation of platform-specific file system event mechanism
 231  */
 232 class wxFSWatcherImpl;
 233
 234 /**
 235  * Main entry point for clients interested in file system events.
 236  * Defines interface that can be used to receive that kind of events.
 237  */
 238 class WXDLLIMPEXP_BASE wxFileSystemWatcherBase: public wxEvtHandler
 239 {
 240 public:
 241     wxFileSystemWatcherBase();
 242
 243     virtual ~wxFileSystemWatcherBase();
 244
 245     /**
 246      * Adds path to currently watched files. Any events concerning this
 247      * particular path will be sent to handler. Optionally a filter can be
 248      * specified to receive only events of particular type.
 249      *
 250      * Please note that when adding a dir, immediate children will be watched
 251      * as well.
 252      */
 253     virtual bool Add(const wxFileName& path, int events = wxFSW_EVENT_ALL);
 254
 255     /**
 256      * Like above, but recursively adds every file/dir in the tree rooted in
 257      * path. Additionally a file mask can be specified to include only files
 258      * of particular type.
 259      */
 260     virtual bool AddTree(const wxFileName& path, int events = wxFSW_EVENT_ALL,
 261                          const wxString& filter = wxEmptyString);
 262
 263     /**
 264      * Removes path from the list of watched paths.
 265      */
 266     virtual bool Remove(const wxFileName& path);
 267
 268     /**
 269      * Same as above, but also removes every file belonging to the tree rooted
 270      * at path.
 271      */
 272     virtual bool RemoveTree(const wxFileName& path);
 273
 274     /**
 275      * Clears the list of currently watched paths.
 276      */
 277     virtual bool RemoveAll();
 278
 279     /**
 280      * Returns the number of watched paths
 281      */
 282     int GetWatchedPathsCount() const;
 283
 284     /**
 285      * Retrevies all watched paths and places them in wxArrayString. Returns
 286      * the number of paths.
 287      *
 288      * TODO think about API here: we need to return more information (like is
 289      * the path watched recursively)
 290      */
 291     int GetWatchedPaths(wxArrayString* paths) const;
 292
 293     wxEvtHandler* GetOwner() const
 294     {
 295         return m_owner;
 296     }
 297
 298     void SetOwner(wxEvtHandler* handler)
 299     {
 300         if (!handler)
 301             m_owner = this;
 302         else
 303             m_owner = handler;
 304     }
 305
 306 protected:
 307
 308     static wxString GetCanonicalPath(const wxFileName& path)
 309     {
 310         wxFileName path_copy = wxFileName(path);
 311         if ( !path_copy.Normalize() )
 312         {
 313             wxFAIL_MSG(wxString::Format("Unable to normalize path '%s'",
 314                                          path.GetFullPath()));
 315             return wxEmptyString;
 316         }
 317
 318         return path_copy.GetFullPath();
 319     }
 320
 321     // Delegates the real work of adding the path to wxFSWatcherImpl::Add() and
 322     // updates m_watches if the new path was successfully added.
 323     bool DoAdd(const wxFileName& path, int events, wxFSWPathType type);
 324
 325
 326     wxFSWatchInfoMap m_watches;        // path=>wxFSWatchInfo map
 327     wxFSWatcherImpl* m_service;     // file system events service
 328     wxEvtHandler* m_owner;             // handler for file system events
 329
 330     friend class wxFSWatcherImpl;
 331 };
 332
 333 // include the platform specific file defining wxFileSystemWatcher
 334 // inheriting from wxFileSystemWatcherBase
 335
 336 #ifdef wxHAS_INOTIFY
 337     #include "wx/unix/fswatcher_inotify.h"
 338     #define wxFileSystemWatcher wxInotifyFileSystemWatcher
 339 #elif defined(wxHAS_KQUEUE)
 340     #include "wx/unix/fswatcher_kqueue.h"
 341     #define wxFileSystemWatcher wxKqueueFileSystemWatcher
 342 #elif defined(__WXMSW__)
 343     #include "wx/msw/fswatcher.h"
 344     #define wxFileSystemWatcher wxMSWFileSystemWatcher
 345 #else
 346     #include "wx/generic/fswatcher.h"
 347     #define wxFileSystemWatcher wxPollingFileSystemWatcher
 348 #endif
 349
 350 #endif // wxUSE_FSWATCHER
 351
 352 #endif /* _WX_FSWATCHER_BASE_H_ */