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# Gdk::PixbufAnimation Class Reference

Inheritance diagram for Gdk::PixbufAnimation:

[legend]

List of all members.

## Detailed Description

The gdk-pixbuf library provides a simple mechanism to load and represent animations.

An animation is conceptually a series of frames to be displayed over time. Each frame is the same size. The animation may not be represented as a series of frames internally; for example, it may be stored as a sprite and instructions for moving the sprite around a background. To display an animation you don't need to understand its representation, however; you just ask gdk-pixbuf what should be displayed at a given point in time.

## Public Member Functions

int | get_height () const
| Queries the height of the bounding box of a pixbuf animation.
Glib::RefPtr<PixbufAnimationIter> | get_iter (const GTimeVal* start_time)
| Get an iterator for displaying an animation.
Glib::RefPtr<Pixbuf> | get_static_image ()
| If an animation is really just a plain image (has only one frame), this function returns that image.
int | get_width () const
| Queries the width of the bounding box of a pixbuf animation.
const GdkPixbufAnimation* | gobj () const
| Provides access to the underlying C GObject.
GdkPixbufAnimation* | gobj ()
| Provides access to the underlying C GObject.
GdkPixbufAnimation* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
bool | is_static_image () const
| If you load a file with new_from_file() and it turns out to be a plain, unanimated image, then this function will return `true`.
virtual | ~PixbufAnimation ()

## Static Public Member Functions

static Glib::RefPtr <PixbufAnimation> | create_from_file (const Glib::ustring& filename)

## Related Functions

(Note that these are not member functions.)
Glib::RefPtr <Gdk::PixbufAnimation> | wrap (GdkPixbufAnimation* object, bool take_copy=false)
| A Glib::wrap() method for this object.

## Constructor & Destructor Documentation

virtual Gdk::PixbufAnimation::~PixbufAnimation | ( |  | ) | `[virtual]`

## Member Function Documentation

static Glib::RefPtr<PixbufAnimation> Gdk::PixbufAnimation::create_from_file | ( | const Glib::ustring & | filename | ) | `[static]`

int Gdk::PixbufAnimation::get_height | ( |  | ) | const

Queries the height of the bounding box of a pixbuf animation.

Returns:
  Height of the bounding box of the animation.

Glib::RefPtr<PixbufAnimationIter> Gdk::PixbufAnimation::get_iter | ( | const GTimeVal * | start_time | ) |

Get an iterator for displaying an animation.

The iterator provides the frames that should be displayed at a given time. It should be freed after use with Glib::object_unref().

start_time would normally come from Glib::get_current_time(), and marks the beginning of animation playback. After creating an iterator, you should immediately display the pixbuf returned by Gdk::PixbufAnimationIter::get_pixbuf(). Then, you should install a timeout (with Glib::timeout_add()) or by some other mechanism ensure that you'll update the image after Gdk::PixbufAnimationIter::get_delay_time() milliseconds. Each time the image is updated, you should reinstall the timeout with the new, possibly-changed delay time.

As a shortcut, if start_time is `0`, the result of Glib::get_current_time() will be used automatically.

To update the image (i.e. possibly change the result of Gdk::PixbufAnimationIter::get_pixbuf() to a new frame of the animation), call Gdk::PixbufAnimationIter::advance().

If you're using Gdk::PixbufLoader, in addition to updating the image after the delay time, you should also update it whenever you receive the area_updated signal and Gdk::PixbufAnimationIter::on_currently_loading_frame() returns `true`. In this case, the frame currently being fed into the loader has received new data, so needs to be refreshed. The delay time for a frame may also be modified after an area_updated signal, for example if the delay time for a frame is encoded in the data after the frame itself. So your timeout should be reinstalled after any area_updated signal.

A delay time of -1 is possible, indicating "infinite."

Parameters:

  | start_time | Time when the animation starts playing.

Returns:
  An iterator to move over the animation.

Glib::RefPtr<Pixbuf> Gdk::PixbufAnimation::get_static_image | ( |  | ) |

If an animation is really just a plain image (has only one frame), this function returns that image.

If the animation is an animation, this function returns a reasonable thing to display as a static unanimated image, which might be the first frame, or something more sophisticated. If an animation hasn't loaded any frames yet, this function will return `0`.

Returns:
  Unanimated image representing the animation.

int Gdk::PixbufAnimation::get_width | ( |  | ) | const

Queries the width of the bounding box of a pixbuf animation.

Returns:
  Width of the bounding box of the animation.

const GdkPixbufAnimation* Gdk::PixbufAnimation::gobj | ( |  | ) | const`[inline]`

Provides access to the underlying C GObject.

Reimplemented from Glib::ObjectBase.

GdkPixbufAnimation* Gdk::PixbufAnimation::gobj | ( |  | ) | `[inline]`

Provides access to the underlying C GObject.

Reimplemented from Glib::ObjectBase.

GdkPixbufAnimation* Gdk::PixbufAnimation::gobj_copy | ( |  | ) |

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

bool Gdk::PixbufAnimation::is_static_image | ( |  | ) | const

If you load a file with new_from_file() and it turns out to be a plain, unanimated image, then this function will return `true`.

Use get_static_image() to retrieve the image.

Returns:
  `true` if the "animation" was really just an image.

## Friends And Related Function Documentation

Glib::RefPtr<Gdk::PixbufAnimation> wrap | ( | GdkPixbufAnimation * | 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.

The documentation for this class was generated from the following file:

- pixbufanimation.h