Gio::FileMonitor Class Reference

Monitors a file or directory for changes. More...

`#include <giomm/filemonitor.h>`

Inheritance diagram for Gio::FileMonitor:
[legend]

## Public Member Functions

| FileMonitor (FileMonitor&& src) noexcept
FileMonitor& | operator= (FileMonitor&& src) noexcept
| ~FileMonitor () noexcept override
GFileMonitor* | gobj ()
| Provides access to the underlying C GObject. More...
const GFileMonitor* | gobj () const
| Provides access to the underlying C GObject. More...
GFileMonitor* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...
bool | cancel ()
| Cancels a file monitor. More...
bool | is_cancelled () const
| Returns whether the monitor is canceled. More...
void | set_rate_limit (int limit_msecs)
| Sets the rate limit to which the monitor will report consecutive change events to the same file. More...
Glib::SignalProxy< void, const Glib::RefPtr< File >&, const Glib::RefPtr< File >&, FileMonitorEvent > | signal_changed ()
Glib::PropertyProxy< int > | property_rate_limit ()
| The limit of the monitor to watch for changes, in milliseconds. More...
Glib::PropertyProxy_ReadOnly< int > | property_rate_limit () const
| The limit of the monitor to watch for changes, in milliseconds. More...
Glib::PropertyProxy_ReadOnly< bool > | property_cancelled () const
| Whether the monitor has been cancelled. More...
Public Member Functions inherited from Glib::Object
| Object (const Object&)=delete
Object& | operator= (const Object&)=delete
| Object (Object&& src) noexcept
Object& | operator= (Object&& src) noexcept
void* | get_data (const QueryQuark& key)
void | set_data (const Quark& key, void* data)
void | set_data (const Quark& key, void* data, DestroyNotify notify)
void | remove_data (const QueryQuark& quark)
void* | steal_data (const QueryQuark& quark)
Public Member Functions inherited from Glib::ObjectBase
| ObjectBase (const ObjectBase&)=delete
ObjectBase& | operator= (const ObjectBase&)=delete
void | set_property_value (const Glib::ustring& property_name, const Glib::ValueBase& value)
| You probably want to use a specific property_*() accessor method instead. More...
void | get_property_value (const Glib::ustring& property_name, Glib::ValueBase& value) const
| You probably want to use a specific property_*() accessor method instead. More...
template<class PropertyType >
void | set_property (const Glib::ustring& property_name, const PropertyType& value)
| You probably want to use a specific property_*() accessor method instead. More...
template<class PropertyType >
void | get_property (const Glib::ustring& property_name, PropertyType& value) const
| You probably want to use a specific property_*() accessor method instead. More...
void | connect_property_changed (const Glib::ustring& property_name, const sigc::slot< void >& slot)
| You can use the signal_changed() signal of the property proxy instead. More...
void | connect_property_changed (const Glib::ustring& property_name, sigc::slot< void >&& slot)
| You can use the signal_changed() signal of the property proxy instead. More...
sigc::connection | connect_property_changed_with_return (const Glib::ustring& property_name, const sigc::slot< void >& slot)
| You can use the signal_changed() signal of the property proxy instead. More...
sigc::connection | connect_property_changed_with_return (const Glib::ustring& property_name, sigc::slot< void >&& slot)
| You can use the signal_changed() signal of the property proxy instead. More...
void | freeze_notify ()
| Increases the freeze count on object. More...
void | thaw_notify ()
| Reverts the effect of a previous call to freeze_notify(). More...
virtual void | reference () const
| Increment the reference count for this object. More...
virtual void | unreference () const
| Decrement the reference count for this object. More...
GObject* | gobj ()
| Provides access to the underlying C GObject. More...
const GObject* | gobj () const
| Provides access to the underlying C GObject. More...
GObject* | gobj_copy () const
| Give a ref-ed copy to someone. Use for direct struct access. More...
Public Member Functions inherited from sigc::trackable
| trackable () noexcept
| trackable (const trackable &src) noexcept
| trackable (trackable &&src)
| ~trackable ()
void | add_destroy_notify_callback (void *data, func_destroy_notify func) const
void | notify_callbacks ()
trackable & | operator= (const trackable &src)
trackable & | operator= (trackable &&src)
void | remove_destroy_notify_callback (void *data) const

## Static Public Member Functions

static GType | get_type ()
| Get the GType for this class, for use with the underlying GObject type system. More...

## Protected Member Functions

virtual void | on_changed (const Glib::RefPtr< File >& file, const Glib::RefPtr< File >& other_file, FileMonitorEvent event_type)
| This is a default handler for the signal signal_changed(). More...
Protected Member Functions inherited from Glib::Object
| Object ()
| Object (const Glib::ConstructParams& construct_params)
| Object (GObject* castitem)
| ~Object () noexcept override
Protected Member Functions inherited from Glib::ObjectBase
| ObjectBase ()
| This default constructor is called implicitly from the constructor of user-derived classes, even if, for instance, Gtk::Button calls a different ObjectBase constructor. More...
| ObjectBase (const char* custom_type_name)
| A derived constructor always overrides this choice. More...
| ObjectBase (const std::type_info& custom_type_info)
| This constructor is a special feature to allow creation of derived types on the fly, without having to use g_object_new() manually. More...
| ObjectBase (ObjectBase&& src) noexcept
ObjectBase& | operator= (ObjectBase&& src) noexcept
virtual | ~ObjectBase () noexcept=0
void | initialize (GObject* castitem)
void | initialize_move (GObject* castitem, Glib::ObjectBase* previous_wrapper)

## Related Functions

(Note that these are not member functions.)
Glib::RefPtr< Gio::FileMonitor > | wrap (GFileMonitor* object, bool take_copy=false)
| A Glib::wrap() method for this object. More...
Related Functions inherited from Glib::Object
Glib::RefPtr< Glib::Object > | wrap (GObject* object, bool take_copy=false)

## Additional Inherited Members

Public Types inherited from Glib::Object
using | DestroyNotify = void(*)(gpointer data)
Public Types inherited from sigc::trackable
typedef internal::func_destroy_notify | func_destroy_notify

## Detailed Description

Monitors a file or directory for changes.

To obtain a FileMonitor for a file or directory, use File::monitor_file() or File::monitor_directory().

To get informed about changes to the file or directory you are monitoring, connect to signal_changed().

Since glibmm 2.16:

## Constructor & Destructor Documentation

Gio::FileMonitor::FileMonitor | ( | FileMonitor&& | src | ) |

noexcept

Gio::FileMonitor::~FileMonitor | ( |  | ) |

overridenoexcept

## Member Function Documentation

bool Gio::FileMonitor::cancel | ( |  | ) |

Cancels a file monitor.

Returns
  Always `true`.

static GType Gio::FileMonitor::get_type | ( |  | ) |

static

Get the GType for this class, for use with the underlying GObject type system.

GFileMonitor* Gio::FileMonitor::gobj | ( |  | ) |

inline

Provides access to the underlying C GObject.

const GFileMonitor* Gio::FileMonitor::gobj | ( |  | ) | const

inline

Provides access to the underlying C GObject.

GFileMonitor* Gio::FileMonitor::gobj_copy | ( |  | ) |

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

bool Gio::FileMonitor::is_cancelled | ( |  | ) | const

Returns whether the monitor is canceled.

Returns
  `true` if monitor is canceled. `false` otherwise.

virtual void Gio::FileMonitor::on_changed | ( | const Glib::RefPtr< File >& | file,
|  | const Glib::RefPtr< File >& | other_file,
|  | FileMonitorEvent | event_type
| ) |  |

protectedvirtual

This is a default handler for the signal signal_changed().

FileMonitor& Gio::FileMonitor::operator= | ( | FileMonitor&& | src | ) |

noexcept

Glib::PropertyProxy_ReadOnly< bool > Gio::FileMonitor::property_cancelled | ( |  | ) | const

Whether the monitor has been cancelled.

Default value: `false`

Returns
  A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< int > Gio::FileMonitor::property_rate_limit | ( |  | ) |

The limit of the monitor to watch for changes, in milliseconds.

Default value: 800

Returns
  A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< int > Gio::FileMonitor::property_rate_limit | ( |  | ) | const

The limit of the monitor to watch for changes, in milliseconds.

Default value: 800

Returns
  A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

void Gio::FileMonitor::set_rate_limit | ( | int | limit_msecs | ) |

Sets the rate limit to which the monitor will report consecutive change events to the same file.

Parameters

  limit_msecs | A non-negative integer with the limit in milliseconds to poll for changes.

Glib::SignalProxy< void,const Glib::RefPtr<File>&,const Glib::RefPtr<File>&,FileMonitorEvent > Gio::FileMonitor::signal_changed | ( |  | ) |

Slot Prototype:
  `void on_my_changed(const Glib::RefPtr<File>& file, const Glib::RefPtr<File>& other_file, FileMonitorEvent event_type)`

Flags: Run Last

Emitted when file has been changed.

If using FILE_MONITOR_WATCH_MOVES on a directory monitor, and the information is available (and if supported by the backend), event_type may be FILE_MONITOR_EVENT_RENAMED, FILE_MONITOR_EVENT_MOVED_IN or FILE_MONITOR_EVENT_MOVED_OUT.

In all cases file will be a child of the monitored directory. For renames, file will be the old name and other_file is the new name. For "moved in" events, file is the name of the file that appeared and other_file is the old name that it was moved from (in another directory). For "moved out" events, file is the name of the file that used to be in this directory and other_file is the name of the file at its new location.

It makes sense to treat FILE_MONITOR_EVENT_MOVED_IN as equivalent to FILE_MONITOR_EVENT_CREATED and FILE_MONITOR_EVENT_MOVED_OUT as equivalent to FILE_MONITOR_EVENT_DELETED, with extra information. FILE_MONITOR_EVENT_RENAMED is equivalent to a delete/create pair. This is exactly how the events will be reported in the case that the FILE_MONITOR_WATCH_MOVES flag is not in use.

If using the deprecated flag FILE_MONITOR_SEND_MOVED flag and event_type is FILE_MONITOR_EVENT_MOVED, file will be set to a File containing the old path, and other_file will be set to a File containing the new path.

In all the other cases, other_file will be set to #`nullptr`.

Parameters

  file | A File.
  other_file | A File or #`nullptr`.
  event_type | A FileMonitorEvent.

## Friends And Related Function Documentation

Glib::RefPtr< Gio::FileMonitor > wrap | ( | GFileMonitor * | object,
|  | bool | take_copy = `false`
| ) |  |

related

A Glib::wrap() method for this object.

Parameters

  object | The C instance.
  take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns
  A C++ instance that wraps this C instance.