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KDirWatch Class Reference

#include <kdirwatch.h>

Inherits TQObject.

Public Types

enum  Method { FAM, DNotify, Stat, INotify }
 

Signals

void dirty (const TQString &path)
 
void dirty (const KURL &url)
 
void created (const TQString &path)
 
void deleted (const TQString &path)
 

Public Member Functions

 KDirWatch (TQObject *parent=0, const char *name=0)
 
 ~KDirWatch ()
 
void addDir (const TQString &path, bool watchFiles=false, bool recursive=false)
 
void addDir (const KURL &url, bool watchFiles=false, bool recursive=false)
 
void addFile (const TQString &file)
 
TQDateTime ctime (const TQString &path)
 
void removeDir (const TQString &path)
 
void removeDir (const KURL &path)
 
void removeFile (const TQString &file)
 
bool stopDirScan (const TQString &path)
 
bool restartDirScan (const TQString &path)
 
void startScan (bool notify=false, bool skippedToo=false)
 
void stopScan ()
 
bool isStopped ()
 
bool contains (const TQString &path) const
 
void setCreated (const TQString &path)
 
void setDirty (const TQString &path)
 
void setDirty (const KURL &url)
 
void setDeleted (const TQString &path)
 
Method internalMethod ()
 

Static Public Member Functions

static void statistics ()
 
static KDirWatch * self ()
 
static bool exists ()
 

Detailed Description

Watch directories and files for changes.

The watched directories or files don't have to exist yet.

When a watched directory is changed, i.e. when files therein are created or deleted, KDirWatch will emit the signal dirty().

When a watched, but previously not existing directory gets created, KDirWatch will emit the signal created().

When a watched directory gets deleted, KDirWatch will emit the signal deleted(). The directory is still watched for new creation.

When a watched file is changed, i.e. attributes changed or written to, KDirWatch will emit the signal dirty().

Scanning of particular directories or files can be stopped temporarily and restarted. The whole class can be stopped and restarted. Directories and files can be added/removed from the list in any state.

The implementation uses the FAM service when available; if FAM is not available, the DNOTIFY functionality is used on LINUX. As a last resort, a regular polling for change of modification times is done; the polling interval is a global config option: DirWatch/PollInterval and DirWatch/NFSPollInterval for NFS mounted directories.

See also
self() Class for watching directory and file changes.
Author
Sven Radej sven@.nosp@m.lisa.nosp@m..exp..nosp@m.univ.nosp@m.ie.ac.nosp@m..at

Definition at line 65 of file kdirwatch.h.

Constructor & Destructor Documentation

KDirWatch::KDirWatch ( TQObject *  parent = 0,
const char *  name = 0 
)

Constructor.

Scanning begins immediately when a dir/file watch is added.

Parameters
parentthe parent of the TQObject (or 0 for parent-less KDataTools)
namethe name of the TQObject, can be 0

Definition at line 1642 of file kdirwatch.cpp.

KDirWatch::~KDirWatch ( )

Destructor.

Stops scanning and cleans up.

Definition at line 1660 of file kdirwatch.cpp.

Member Function Documentation

void KDirWatch::addDir ( const TQString &  path,
bool  watchFiles = false,
bool  recursive = false 
)

Adds a directory to be watched.

The directory does not have to exist. When watchFiles is false (the default), the signals dirty(), created(), deleted() can be emitted, all for the watched directory. When watchFiles is true, all files in the watched directory are watched for changes, too. Thus, the signals dirty(), created(), deleted() can be emitted.

Parameters
paththe path to watch
watchFilesif true, the KDirWatch will also watch files - NOT IMPLEMENTED YET
recursiveif true, all sub directories are also watched - NOT IMPLEMENTED YET

Definition at line 1673 of file kdirwatch.cpp.

void KDirWatch::addFile ( const TQString &  file)

Adds a file to be watched.

Parameters
filethe file to watch

Definition at line 1690 of file kdirwatch.cpp.

bool KDirWatch::contains ( const TQString &  path) const

Check if a directory is being watched by this KDirWatch instance.

Parameters
paththe directory to check
Returns
true if the directory is being watched

Definition at line 1755 of file kdirwatch.cpp.

void KDirWatch::created ( const TQString &  path)
signal

Emitted when a file or directory is created.

Parameters
paththe path of the file or directory
TQDateTime KDirWatch::ctime ( const TQString &  path)

Returns the time the directory/file was last changed.

Parameters
paththe file to check
Returns
the date of the last modification

Definition at line 1695 of file kdirwatch.cpp.

void KDirWatch::deleted ( const TQString &  path)
signal

Emitted when a file or directory is deleted.

The object is still watched for new creation.

Parameters
paththe path of the file or directory
void KDirWatch::dirty ( const TQString &  path)
signal

Emitted when a watched object is changed.

For a directory this signal is emitted when files therein are created or deleted. For a file this signal is emitted when its size or attributes change.

When you watch a directory, changes in the size or attributes of contained files may or may not trigger this signal to be emitted depending on which backend is used by KDirWatch.

The new ctime is set before the signal is emitted.

Parameters
paththe path of the file or directory
bool KDirWatch::exists ( )
static

Returns true if there is an instance of KDirWatch.

Returns
true if there is an instance of KDirWatch.
See also
KDirWatch::self()
Since
3.1

Definition at line 1637 of file kdirwatch.cpp.

KDirWatch::Method KDirWatch::internalMethod ( )

Returns the preferred internal method to watch for changes.

Since
3.2

Definition at line 1802 of file kdirwatch.cpp.

bool KDirWatch::isStopped ( )
inline

Is scanning stopped? After creation of a KDirWatch instance, this is false.

Returns
true when scanning stopped

Definition at line 195 of file kdirwatch.h.

void KDirWatch::removeDir ( const TQString &  path)

Removes a directory from the list of scanned directories.

If specified path is not in the list this does nothing.

Parameters
paththe path of the dir to be removed from the list

Definition at line 1707 of file kdirwatch.cpp.

void KDirWatch::removeFile ( const TQString &  file)

Removes a file from the list of watched files.

If specified path is not in the list this does nothing.

Parameters
filethe file to be removed from the list

Definition at line 1717 of file kdirwatch.cpp.

bool KDirWatch::restartDirScan ( const TQString &  path)

Restarts scanning for specified path.

Resets ctime. It doesn't notify the change (by emitted a signal), since the ctime value is reset.

Call it when you are finished with big operations on that path, and when you have refreshed that path.

Parameters
paththe path to restart scanning
Returns
true if the path is being watched, otherwise false
See also
stopDirScanning()

Definition at line 1731 of file kdirwatch.cpp.

KDirWatch * KDirWatch::self ( )
static

The KDirWatch instance usually globally used in an application.

It is automatically deleted when the application exits.

However, you can create an arbitrary number of KDirWatch instances aside from this one - for those you have to take care of memory management.

This function returns an instance of KDirWatch. If there is none, it will be created.

Returns
a KDirWatch instance

Definition at line 1628 of file kdirwatch.cpp.

void KDirWatch::setCreated ( const TQString &  path)

Emits created().

Parameters
paththe path of the file or directory

Definition at line 1778 of file kdirwatch.cpp.

void KDirWatch::setDeleted ( const TQString &  path)

Emits deleted().

Parameters
paththe path of the file or directory

Definition at line 1796 of file kdirwatch.cpp.

void KDirWatch::setDirty ( const TQString &  path)

Emits dirty().

Parameters
paththe path of the file or directory

Definition at line 1784 of file kdirwatch.cpp.

void KDirWatch::startScan ( bool  notify = false,
bool  skippedToo = false 
)

Starts scanning of all dirs in list.

Parameters
notifyIf true, all changed directories (since stopScan() call) will be notified for refresh. If notify is false, all ctimes will be reset (except those who are stopped, but only if skippedToo is false) and changed dirs won't be notified. You can start scanning even if the list is empty. First call should be called with false or else all directories in list will be notified.
skippedTooif true, the skipped directoris (scanning of which was stopped with stopDirScan() ) will be reset and notified for change. Otherwise, stopped directories will continue to be unnotified.

Definition at line 1748 of file kdirwatch.cpp.

void KDirWatch::statistics ( )
static

Dump statistic information about all KDirWatch instances.

This checks for consistency, too.

Definition at line 1768 of file kdirwatch.cpp.

bool KDirWatch::stopDirScan ( const TQString &  path)

Stops scanning the specified path.

The path is not deleted from the interal just, it is just skipped. Call this function when you perform an huge operation on this directory (copy/move big files or many files). When finished, call restartDirScan(path).

Parameters
paththe path to skip
Returns
true if the path is being watched, otherwise false
See also
restartDirScanning()

Definition at line 1722 of file kdirwatch.cpp.

void KDirWatch::stopScan ( )

Stops scanning of all directories in internal list.

The timer is stopped, but the list is not cleared.

Definition at line 1742 of file kdirwatch.cpp.


The documentation for this class was generated from the following files:
  • kdirwatch.h
  • kdirwatch.cpp

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