092e08a844
This flag generates the corresponding event when the file system containing the watched directory is unmounted. Currently it is only implemented for Linux where unmounting now generates this event instead of an error. Closes #14834. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72987 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
298 lines
9.5 KiB
Objective-C
298 lines
9.5 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/fswatcher.h
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// Purpose: wxFileSystemWatcher
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// Author: Bartosz Bekier
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// Created: 2009-05-23
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// RCS-ID: $Id$
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// Copyright: (c) 2009 Bartosz Bekier <bartosz.bekier@gmail.com>
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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@class wxFileSystemWatcher
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The wxFileSystemWatcher class allows to receive notifications of file
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system changes.
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@note Implementation limitations: this class is currently implemented for
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MSW, OS X and GTK ports but doesn't detect all changes correctly
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everywhere: under MSW accessing the file is not detected (only
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modifying it is) and under OS X neither accessing nor modifying is
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detected (only creating and deleting files is). Moreover, OS X
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version doesn't currently collapse pairs of create/delete events in a
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rename event, unlike the other ones.
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For the full list of change types that are reported see wxFSWFlags.
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This class notifies the application about the file system changes by
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sending events of wxFileSystemWatcherEvent class. By default these events
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are sent to the wxFileSystemWatcher object itself so you can derive from it
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and use the event table @c EVT_FSWATCHER macro to handle these events in a
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derived class method. Alternatively, you can use
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wxFileSystemWatcher::SetOwner() to send the events to another object. Or
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you could use wxEvtHandler::Connect() with @c wxEVT_FSWATCHER to handle
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these events in any other object. See the fswatcher sample for an example
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of the latter approach.
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@library{wxbase}
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@category{file}
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@since 2.9.1
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*/
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class wxFileSystemWatcher: public wxEvtHandler
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{
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public:
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/**
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Default constructor.
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*/
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wxFileSystemWatcher();
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/**
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Destructor. Stops all paths from being watched and frees any system
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resources used by this file system watcher object.
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*/
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virtual ~wxFileSystemWatcher();
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/**
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Adds @a path to currently watched files.
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The @a path argument can currently only be a directory and any changes
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to this directory itself or its immediate children will generate the
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events. Use AddTree() to monitor the directory recursively.
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Note that on platforms that use symbolic links, you should consider the
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possibility that @a path is a symlink. To watch the symlink itself and
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not its target you may call wxFileName::DontFollowLink() on @a path.
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@param path
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The name of the path to watch.
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@param events
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An optional filter to receive only events of particular types.
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This is currently implemented only for GTK.
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*/
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virtual bool Add(const wxFileName& path, int events = wxFSW_EVENT_ALL);
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/**
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This is the same as Add(), but also recursively adds every
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file/directory in the tree rooted at @a path.
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Additionally a file mask can be specified to include only files
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matching that particular mask.
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This method is implemented efficiently on MSW, but should be used with
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care on other platforms for directories with lots of children (e.g. the
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root directory) as it calls Add() for each subdirectory, potentially
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creating a lot of watches and taking a long time to execute.
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Note that on platforms that use symbolic links, you will probably want
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to have called wxFileName::DontFollowLink on @a path. This is especially
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important if the symlink targets may themselves be watched.
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*/
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virtual bool AddTree(const wxFileName& path, int events = wxFSW_EVENT_ALL,
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const wxString& filter = wxEmptyString);
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/**
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Removes @a path from the list of watched paths.
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See the comment in Add() about symbolic links. @a path should treat
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symbolic links in the same way as in the original Add() call.
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*/
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virtual bool Remove(const wxFileName& path);
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/**
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This is the same as Remove(), but also removes every file/directory
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belonging to the tree rooted at @a path.
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See the comment in AddTree() about symbolic links. @a path should treat
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symbolic links in the same way as in the original AddTree() call.
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*/
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virtual bool RemoveTree(const wxFileName& path);
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/**
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Clears the list of currently watched paths.
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*/
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virtual bool RemoveAll();
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/**
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Returns the number of currently watched paths.
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@see GetWatchedPaths()
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*/
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int GetWatchedPathsCount() const;
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/**
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Retrieves all watched paths and places them in @a paths. Returns
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the number of watched paths, which is also the number of entries added
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to @a paths.
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*/
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int GetWatchedPaths(wxArrayString* paths) const;
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/**
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Associates the file system watcher with the given @a handler object.
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All the events generated by this object will be passed to the specified
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owner.
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*/
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void SetOwner(wxEvtHandler* handler);
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};
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/**
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@class wxFileSystemWatcherEvent
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A class of events sent when a file system event occurs. Types of events
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reported may vary depending on a platform, however all platforms report
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at least creation of new file/directory and access, modification, move
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(rename) or deletion of an existing one.
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@library{wxbase}
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@category{events}
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@see wxFileSystemWatcher
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@see @ref overview_events
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@since 2.9.1
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*/
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class wxFileSystemWatcherEvent : public wxEvent
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{
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public:
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wxFileSystemWatcherEvent(int changeType, int watchid = wxID_ANY);
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wxFileSystemWatcherEvent(int changeType, const wxString& errorMsg,
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int watchid = wxID_ANY);
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wxFileSystemWatcherEvent(int changeType,
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const wxFileName& path, const wxFileName& newPath,
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int watchid = wxID_ANY);
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/**
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Returns the path at which the event occurred.
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*/
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const wxFileName& GetPath() const;
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/**
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Returns the new path of the renamed file/directory if this is a rename
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event.
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Otherwise it returns the same path as GetPath().
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*/
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const wxFileName& GetNewPath() const;
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/**
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Returns the type of file system change that occurred. See wxFSWFlags for
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the list of possible file system change types.
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*/
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int GetChangeType() const;
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/**
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Returns @c true if this error is an error event
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Error event is an event generated when a warning or error condition
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arises.
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*/
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bool IsError() const;
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/**
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Return a description of the warning or error if this is an error event.
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*/
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wxString GetErrorDescription() const;
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/**
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Returns a wxString describing an event, useful for logging, debugging
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or testing.
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*/
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wxString ToString() const;
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};
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wxEventType wxEVT_FSWATCHER;
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/**
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These are the possible types of file system change events.
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Not all of these events are reported on all platforms currently.
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@since 2.9.1
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*/
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enum wxFSWFlags
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{
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/// File or directory was created.
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wxFSW_EVENT_CREATE = 0x01,
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/// File or directory was deleted.
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wxFSW_EVENT_DELETE = 0x02,
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/**
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File or directory was renamed.
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Notice that under MSW this event is sometimes -- although not always --
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followed by a ::wxFSW_EVENT_MODIFY for the new file.
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Under OS X this event is currently not detected and instead separate
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::wxFSW_EVENT_CREATE and ::wxFSW_EVENT_DELETE events are.
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*/
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wxFSW_EVENT_RENAME = 0x04,
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/**
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File or directory was modified.
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Depending on the program doing the file modification, multiple such
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events can be reported for a single logical file update.
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Under OS X this event is currently not detected.
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*/
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wxFSW_EVENT_MODIFY = 0x08,
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/**
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File or directory was accessed.
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This event is currently only detected under Linux.
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*/
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wxFSW_EVENT_ACCESS = 0x10,
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/**
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The item's metadata was changed, e.g.\ its permissions or timestamps.
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This event is currently only detected under Linux.
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@since 2.9.5
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*/
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wxFSW_EVENT_ATTRIB = 0x20,
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/**
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The file system containing a watched item was unmounted.
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wxFSW_EVENT_UNMOUNT cannot be set; unmount events are produced automatically. This flag
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is therefore not included in wxFSW_EVENT_ALL.
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This event is currently only detected under Linux.
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@since 2.9.5
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*/
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wxFSW_EVENT_UNMOUNT = 0x2000,
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/**
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A warning condition arose.
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This is something that probably needs to be shown to the user in an
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interactive program as it can indicate a relatively serious problem,
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e.g. some events could have been missed because of an overflow. But
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more events will still be coming in the future, unlike for the error
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condition below.
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*/
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wxFSW_EVENT_WARNING = 0x40,
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/**
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An error condition arose.
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Errors are fatal, i.e. no more events will be reported after an error
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and the program can stop watching the directories currently being
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monitored.
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*/
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wxFSW_EVENT_ERROR = 0x80,
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wxFSW_EVENT_ALL = wxFSW_EVENT_CREATE | wxFSW_EVENT_DELETE |
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wxFSW_EVENT_RENAME | wxFSW_EVENT_MODIFY |
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wxFSW_EVENT_ACCESS | wxFSW_EVENT_ATTRIB |
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wxFSW_EVENT_WARNING | wxFSW_EVENT_ERROR
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};
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