gtkmm 3.22.1

Public Member Functions | Static Public Member Functions | Related Functions | List of all members
Gdk::PixbufAnimationIter Class Reference

An iterator which points to a certain position in a PixbufAnimation. More...

`#include <gdkmm/pixbufanimationiter.h>`

Inheritance diagram for Gdk::PixbufAnimationIter:
[legend]

## Public Member Functions
| PixbufAnimationIter (PixbufAnimationIter&& src) noexcept
PixbufAnimationIter& | operator= (PixbufAnimationIter&& src) noexcept
| ~PixbufAnimationIter () noexcept override
GdkPixbufAnimationIter* | gobj ()
| Provides access to the underlying C GObject. More...
const GdkPixbufAnimationIter* | gobj () const
| Provides access to the underlying C GObject. More...
GdkPixbufAnimationIter* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...
int | get_delay_time () const
| Gets the number of milliseconds the current pixbuf should be displayed, or -1 if the current pixbuf should be displayed forever. More...
Glib::RefPtr< Gdk::Pixbuf > | get_pixbuf ()
| Gets the current pixbuf which should be displayed; the pixbuf will be the same size as the animation itself (Gdk::Pixbuf::get_width(), Gdk::Pixbuf:get_height()). More...
Glib::RefPtr< const Gdk::Pixbuf > | get_pixbuf () const
| Gets the current pixbuf which should be displayed; the pixbuf will be the same size as the animation itself (Gdk::Pixbuf::get_width(), Gdk::Pixbuf:get_height()). More...
bool | on_currently_loading_frame () const
| Used to determine how to respond to the area_updated signal on Gdk::PixbufLoader when loading an animation. More...
bool | advance (const Glib::TimeVal& current_time)
| Possibly advances an animation to a new frame. More...
bool | advance ()
| Possibly advances an animation to a new frame. 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)
Glib::RefPtr< Glib::Object > | wrap (GObject *object, bool take_copy=false)
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)
void | get_property_value (const Glib::ustring &property_name, Glib::ValueBase &value) const
void | set_property (const Glib::ustring &property_name, const PropertyType &value)
void | get_property (const Glib::ustring &property_name, PropertyType &value) const
void | connect_property_changed (const Glib::ustring &property_name, const sigc::slot< void > &slot)
void | connect_property_changed (const Glib::ustring &property_name, sigc::slot< void > &&slot)
sigc::connection | connect_property_changed_with_return (const Glib::ustring &property_name, const sigc::slot< void > &slot)
sigc::connection | connect_property_changed_with_return (const Glib::ustring &property_name, sigc::slot< void > &&slot)
void | freeze_notify ()
void | thaw_notify ()
virtual void | reference () const
virtual void | unreference () const
GObject * | gobj ()
const GObject * | gobj () const
GObject * | gobj_copy () const
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...

## Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Gdk::PixbufAnimationIter > | wrap (GdkPixbufAnimationIter* object, bool take_copy=false)
| A Glib::wrap() method for this object. More...

## Additional Inherited Members
Public Types inherited from Glib::Object
typedef void(*)(gpointer data | DestroyNotify)
Public Types inherited from sigc::trackable
typedef internal::func_destroy_notify | func_destroy_notify
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 ()
| ObjectBase (const char *custom_type_name)
| ObjectBase (const std::type_info &custom_type_info)
| 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)

## Detailed Description

An iterator which points to a certain position in a PixbufAnimation.

## Constructor & Destructor Documentation

## ◆ PixbufAnimationIter()

Gdk::PixbufAnimationIter::PixbufAnimationIter | ( | PixbufAnimationIter&& | src | ) |
| noexcept

## ◆ ~PixbufAnimationIter()

Gdk::PixbufAnimationIter::~PixbufAnimationIter | ( |  | ) |
| override noexcept

## Member Function Documentation

## ◆ advance() [1/2]

bool Gdk::PixbufAnimationIter::advance | ( | const Glib::TimeVal & | current_time | ) |

Possibly advances an animation to a new frame.

Chooses the frame based on the start time passed to Gdk::PixbufAnimation::get_iter().

current_time would normally come from Glib::get_current_time(), and must be greater than or equal to the time passed to Gdk::PixbufAnimation::get_iter(), and must increase or remain unchanged each time get_pixbuf() is called. That is, you can't go backward in time; animations only play forward.

If using the method overload that takes no current_time parameter then the current time will be used. So you only need to explicitly pass current_time if you're doing something odd like playing the animation at double speed.

If this function returns `false`, there's no need to update the animation display, assuming the display had been rendered prior to advancing; if `true`, you need to call get_pixbuf() and update the display with the new pixbuf.

Since gtkmm 2.14:

Parameters

  current_time | Current time.

Returns
  `true` if the image may need updating.

## ◆ advance() [2/2]

bool Gdk::PixbufAnimationIter::advance | ( |  | ) |

Possibly advances an animation to a new frame.

Chooses the frame based on the start time passed to Gdk::PixbufAnimation::get_iter().

If this function returns false, there's no need to update the animation display, assuming the display had been rendered prior to advancing; if true, you need to call get_pixbuf() and update the display with the new pixbuf.

Since gtkmm 2.14:

Returns
  true if the image may need updating.

## ◆ get_delay_time()

int Gdk::PixbufAnimationIter::get_delay_time | ( |  | ) | const

Gets the number of milliseconds the current pixbuf should be displayed, or -1 if the current pixbuf should be displayed forever.

Glib::signal_timeout.connect() conveniently takes a timeout in milliseconds, so you can use a timeout to schedule the next update.

Since gtkmm 2.14:

Returns
  Delay time in milliseconds (thousandths of a second).

## ◆ get_pixbuf() [1/2]

Glib::RefPtr<Gdk::Pixbuf> Gdk::PixbufAnimationIter::get_pixbuf | ( |  | ) |

Gets the current pixbuf which should be displayed; the pixbuf will be the same size as the animation itself (Gdk::Pixbuf::get_width(), Gdk::Pixbuf:get_height()).

This pixbuf should be displayed for get_delay_time() milliseconds. The returned pixbuf will become invalid when the iterator advances to the next frame, which may happen anytime you call advance(). Copy the pixbuf to keep it, with Gdk::Pixbuf::copy() as it may get recycled as you advance the iterator.

Since gtkmm 2.14:

Returns
  The pixbuf to be displayed.

## ◆ get_pixbuf() [2/2]

Glib::RefPtr<const Gdk::Pixbuf> Gdk::PixbufAnimationIter::get_pixbuf | ( |  | ) | const

Gets the current pixbuf which should be displayed; the pixbuf will be the same size as the animation itself (Gdk::Pixbuf::get_width(), Gdk::Pixbuf:get_height()).

This pixbuf should be displayed for get_delay_time() milliseconds. The returned pixbuf will become invalid when the iterator advances to the next frame, which may happen anytime you call advance(). Copy the pixbuf to keep it, with Gdk::Pixbuf::copy() as it may get recycled as you advance the iterator.

Since gtkmm 2.14:

Returns
  The pixbuf to be displayed.

## ◆ get_type()

static GType Gdk::PixbufAnimationIter::get_type | ( |  | ) |
| static

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

## ◆ gobj() [1/2]

GdkPixbufAnimationIter* Gdk::PixbufAnimationIter::gobj | ( |  | ) |
| inline

Provides access to the underlying C GObject.

## ◆ gobj() [2/2]

const GdkPixbufAnimationIter* Gdk::PixbufAnimationIter::gobj | ( |  | ) | const
| inline

Provides access to the underlying C GObject.

## ◆ gobj_copy()

GdkPixbufAnimationIter* Gdk::PixbufAnimationIter::gobj_copy | ( |  | ) |

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

## ◆ on_currently_loading_frame()

bool Gdk::PixbufAnimationIter::on_currently_loading_frame | ( |  | ) | const

Used to determine how to respond to the area_updated signal on Gdk::PixbufLoader when loading an animation.

The area_updated signal is emitted for an area of the frame currently streaming in to the loader. So if you're on the currently loading frame, you need to redraw the screen for the updated area.

Since gtkmm 2.14:

Returns
  `true` if the frame we're on is partially loaded, or the last frame.

## ◆ operator=()

PixbufAnimationIter& Gdk::PixbufAnimationIter::operator= | ( | PixbufAnimationIter&& | src | ) |
| noexcept

## Friends And Related Function Documentation

## ◆ wrap()

Glib::RefPtr< Gdk::PixbufAnimationIter > wrap | ( | GdkPixbufAnimationIter * | 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.