gtkmm
3.11.4
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The gdk-pixbuf library provides a simple mechanism to load and represent animations. More...
Public Member Functions | |
virtual | ~PixbufAnimation () |
GdkPixbufAnimation* | gobj () |
Provides access to the underlying C GObject. More... | |
const GdkPixbufAnimation* | gobj () const |
Provides access to the underlying C GObject. More... | |
GdkPixbufAnimation* | 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_width () const |
Queries the width of the bounding box of a pixbuf animation. More... | |
int | get_height () const |
Queries the height of the bounding box of a pixbuf animation. More... | |
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 . More... | |
Glib::RefPtr< Pixbuf > | get_static_image () |
If an animation is really just a plain image (has only one frame), this function returns that image. More... | |
Glib::RefPtr< PixbufAnimationIter > | get_iter (const GTimeVal* start_time) |
Get an iterator for displaying an animation. More... | |
Static Public Member Functions | |
static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. More... | |
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. More... | |
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.
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virtual |
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static |
int Gdk::PixbufAnimation::get_height | ( | ) | const |
Queries the height of the bounding box of a pixbuf 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."
start_time | Time when the animation starts playing. |
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
.
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static |
Get the GType for this class, for use with the underlying GObject type system.
int Gdk::PixbufAnimation::get_width | ( | ) | const |
Queries the width of the bounding box of a pixbuf animation.
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inline |
Provides access to the underlying C GObject.
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inline |
Provides access to the underlying C GObject.
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.
true
if the "animation" was really just an image.
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related |
A Glib::wrap() method for this object.
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. |