f8d3714816
The directories used to be always monitored recursively, even when this wasn't requested, in wxMSW implementation. Change this but also implement efficient support for monitoring the entire hierarchies using the native support for this. Also update the sample to allow monitoring directories recursively as well. See #12847. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67693 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
353 lines
9.5 KiB
C++
353 lines
9.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/fswatcher.h
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// Purpose: wxFileSystemWatcherBase
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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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#ifndef _WX_FSWATCHER_BASE_H_
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#define _WX_FSWATCHER_BASE_H_
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#include "wx/defs.h"
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#if wxUSE_FSWATCHER
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#include "wx/log.h"
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#include "wx/event.h"
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#include "wx/evtloop.h"
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#include "wx/filename.h"
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#include "wx/dir.h"
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#include "wx/hashmap.h"
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#define wxTRACE_FSWATCHER "fswatcher"
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// ----------------------------------------------------------------------------
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// wxFileSystemWatcherEventType & wxFileSystemWatcherEvent
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// ----------------------------------------------------------------------------
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/**
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* Possible types of file system events.
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* This is a subset that will work fine an all platforms (actually, we will
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* see how it works on Mac).
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*
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* We got 2 types of error events:
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* - warning: these are not fatal and further events can still be generated
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* - error: indicates fatal error and causes that no more events will happen
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*/
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enum
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{
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wxFSW_EVENT_CREATE = 0x01,
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wxFSW_EVENT_DELETE = 0x02,
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wxFSW_EVENT_RENAME = 0x04,
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wxFSW_EVENT_MODIFY = 0x08,
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wxFSW_EVENT_ACCESS = 0x10,
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// error events
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wxFSW_EVENT_WARNING = 0x20,
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wxFSW_EVENT_ERROR = 0x40,
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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 |
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wxFSW_EVENT_WARNING | wxFSW_EVENT_ERROR
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};
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// Type of the path watched, used only internally for now.
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enum wxFSWPathType
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{
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wxFSWPath_None, // Invalid value for an initialized watch.
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wxFSWPath_File, // Plain file.
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wxFSWPath_Dir, // Watch a directory and the files in it.
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wxFSWPath_Tree // Watch a directory and all its children recursively.
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};
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/**
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* Event containing information about file system change.
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*/
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class WXDLLIMPEXP_FWD_BASE wxFileSystemWatcherEvent;
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wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_BASE, wxEVT_FSWATCHER,
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wxFileSystemWatcherEvent);
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class WXDLLIMPEXP_BASE 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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wxEvent(watchid, wxEVT_FSWATCHER),
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m_changeType(changeType)
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{
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}
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wxFileSystemWatcherEvent(int changeType, const wxString& errorMsg,
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int watchid = wxID_ANY) :
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wxEvent(watchid, wxEVT_FSWATCHER),
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m_changeType(changeType), m_errorMsg(errorMsg)
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{
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}
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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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wxEvent(watchid, wxEVT_FSWATCHER),
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m_changeType(changeType), m_path(path), m_newPath(newPath)
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{
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}
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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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return m_path;
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}
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/**
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* Sets the path at which the event occurred
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*/
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void SetPath(const wxFileName& path)
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{
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m_path = path;
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}
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/**
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* In case of rename(move?) events, returns the new path related to the
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* event. The "new" means newer in the sense of time. In case of other
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* events 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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return m_newPath;
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}
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/**
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* Sets the new path related to the event. See above.
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*/
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void SetNewPath(const wxFileName& path)
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{
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m_newPath = path;
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}
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/**
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* Returns the type of file system event that occurred.
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*/
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int GetChangeType() const
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{
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return m_changeType;
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}
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virtual wxEvent* Clone() const
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{
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wxFileSystemWatcherEvent* evt = new wxFileSystemWatcherEvent(*this);
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evt->m_errorMsg = m_errorMsg.Clone();
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evt->m_path = wxFileName(m_path.GetFullPath().Clone());
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evt->m_newPath = wxFileName(m_newPath.GetFullPath().Clone());
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return evt;
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}
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virtual wxEventCategory GetEventCategory() const
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{
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// TODO this has to be merged with "similiar" categories and changed
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return wxEVT_CATEGORY_UNKNOWN;
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}
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/**
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* Returns if this error is an error event
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*/
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bool IsError() const
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{
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return (m_changeType & (wxFSW_EVENT_ERROR | wxFSW_EVENT_WARNING)) != 0;
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}
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wxString GetErrorDescription() const
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{
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return m_errorMsg;
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}
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/**
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* Returns a wxString describing an event useful for debugging or testing
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*/
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wxString ToString() const;
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protected:
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int m_changeType;
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wxFileName m_path;
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wxFileName m_newPath;
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wxString m_errorMsg;
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};
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typedef void (wxEvtHandler::*wxFileSystemWatcherEventFunction)
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(wxFileSystemWatcherEvent&);
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#define wxFileSystemWatcherEventHandler(func) \
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wxEVENT_HANDLER_CAST(wxFileSystemWatcherEventFunction, func)
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// ----------------------------------------------------------------------------
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// wxFileSystemWatcherBase: interface for wxFileSystemWatcher
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// ----------------------------------------------------------------------------
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// Simple container to store information about one watched path.
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class wxFSWatchInfo
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{
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public:
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wxFSWatchInfo() :
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m_events(-1), m_type(wxFSWPath_None)
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{
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}
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wxFSWatchInfo(const wxString& path, int events, wxFSWPathType type) :
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m_path(path), m_events(events), m_type(type)
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{
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}
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const wxString& GetPath() const
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{
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return m_path;
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}
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int GetFlags() const
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{
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return m_events;
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}
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wxFSWPathType GetType() const
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{
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return m_type;
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}
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protected:
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wxString m_path;
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int m_events;
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wxFSWPathType m_type;
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};
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WX_DECLARE_STRING_HASH_MAP(wxFSWatchInfo, wxFSWatchInfoMap);
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/**
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* Encapsulation of platform-specific file system event mechanism
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*/
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class wxFSWatcherImpl;
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/**
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* Main entry point for clients interested in file system events.
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* Defines interface that can be used to receive that kind of events.
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*/
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class WXDLLIMPEXP_BASE wxFileSystemWatcherBase: public wxEvtHandler
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{
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public:
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wxFileSystemWatcherBase();
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virtual ~wxFileSystemWatcherBase();
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/**
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* Adds path to currently watched files. Any events concerning this
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* particular path will be sent to handler. Optionally a filter can be
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* specified to receive only events of particular type.
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*
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* Please note that when adding a dir, immediate children will be watched
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* as well.
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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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* Like above, but recursively adds every file/dir in the tree rooted in
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* path. Additionally a file mask can be specified to include only files
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* of particular type.
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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 path from the list of watched paths.
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*/
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virtual bool Remove(const wxFileName& path);
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/**
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* Same as above, but also removes every file belonging to the tree rooted
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* at path.
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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 watched paths
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*/
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int GetWatchedPathsCount() const;
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/**
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* Retrevies all watched paths and places them in wxArrayString. Returns
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* the number of paths.
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*
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* TODO think about API here: we need to return more information (like is
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* the path watched recursively)
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*/
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int GetWatchedPaths(wxArrayString* paths) const;
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wxEvtHandler* GetOwner() const
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{
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return m_owner;
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}
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void SetOwner(wxEvtHandler* handler)
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{
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if (!handler)
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m_owner = this;
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else
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m_owner = handler;
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}
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protected:
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static wxString GetCanonicalPath(const wxFileName& path)
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{
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wxFileName path_copy = wxFileName(path);
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if ( !path_copy.Normalize() )
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{
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wxFAIL_MSG(wxString::Format("Unable to normalize path '%s'",
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path.GetFullPath()));
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return wxEmptyString;
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}
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return path_copy.GetFullPath();
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}
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// Delegates the real work of adding the path to wxFSWatcherImpl::Add() and
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// updates m_watches if the new path was successfully added.
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bool DoAdd(const wxFileName& path, int events, wxFSWPathType type);
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wxFSWatchInfoMap m_watches; // path=>wxFSWatchInfo map
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wxFSWatcherImpl* m_service; // file system events service
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wxEvtHandler* m_owner; // handler for file system events
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friend class wxFSWatcherImpl;
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};
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// include the platform specific file defining wxFileSystemWatcher
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// inheriting from wxFileSystemWatcherBase
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#ifdef wxHAS_INOTIFY
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#include "wx/unix/fswatcher_inotify.h"
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#define wxFileSystemWatcher wxInotifyFileSystemWatcher
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#elif defined(wxHAS_KQUEUE)
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#include "wx/unix/fswatcher_kqueue.h"
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#define wxFileSystemWatcher wxKqueueFileSystemWatcher
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#elif defined(__WXMSW__)
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#include "wx/msw/fswatcher.h"
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#define wxFileSystemWatcher wxMSWFileSystemWatcher
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#else
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#include "wx/generic/fswatcher.h"
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#define wxFileSystemWatcher wxPollingFileSystemWatcher
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#endif
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#endif // wxUSE_FSWATCHER
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#endif /* _WX_FSWATCHER_BASE_H_ */
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