pub trait PixbufAnimationIterImpl: ObjectImpl {
// Provided methods
fn delay_time(&self) -> Option<Duration> { ... }
fn pixbuf(&self) -> Pixbuf { ... }
fn on_currently_loading_frame(&self) -> bool { ... }
fn advance(&self, current_time: SystemTime) -> bool { ... }
}
Provided Methods§
sourcefn delay_time(&self) -> Option<Duration>
fn delay_time(&self) -> Option<Duration>
Time in milliseconds, returning None
implies showing the same pixbuf forever.
Gets the number of milliseconds the current pixbuf should be displayed,
or -1 if the current pixbuf should be displayed forever.
The g_timeout_add()
function conveniently takes a timeout in milliseconds,
so you can use a timeout to schedule the next update.
Note that some formats, like GIF, might clamp the timeout values in the image file to avoid updates that are just too quick. The minimum timeout for GIF images is currently 20 milliseconds.
§Returns
delay time in milliseconds (thousandths of a second)
sourcefn pixbuf(&self) -> Pixbuf
fn pixbuf(&self) -> Pixbuf
Gets the current pixbuf which should be displayed.
The pixbuf might not be the same size as the animation itself (gdk_pixbuf_animation_get_width(), gdk_pixbuf_animation_get_height()).
This pixbuf should be displayed for gdk_pixbuf_animation_iter_get_delay_time() milliseconds.
The caller of this function does not own a reference to the returned pixbuf; the returned pixbuf will become invalid when the iterator advances to the next frame, which may happen anytime you call gdk_pixbuf_animation_iter_advance().
Copy the pixbuf to keep it (don’t just add a reference), as it may get recycled as you advance the iterator.
§Returns
the pixbuf to be displayed
sourcefn on_currently_loading_frame(&self) -> bool
fn on_currently_loading_frame(&self) -> bool
Used to determine how to respond to the area_updated signal on #GdkPixbufLoader 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 will need to redraw the screen for the updated area.
§Returns
TRUE
if the frame we’re on is partially loaded, or the last frame
sourcefn advance(&self, current_time: SystemTime) -> bool
fn advance(&self, current_time: SystemTime) -> bool
Possibly advances an animation to a new frame.
Chooses the frame based on the start time passed to gdk_pixbuf_animation_get_iter().
@current_time would normally come from g_get_current_time(), and must be greater than or equal to the time passed to gdk_pixbuf_animation_get_iter(), and must increase or remain unchanged each time gdk_pixbuf_animation_iter_get_pixbuf() is called. That is, you can’t go backward in time; animations only play forward.
As a shortcut, pass NULL
for the current time and g_get_current_time()
will be invoked on your behalf. 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 gdk_pixbuf_animation_iter_get_pixbuf()
and update the display with the new pixbuf.
§current_time
current time
§Returns
TRUE
if the image may need updating