qt-animation-timeline 0.1.3

Package description.

qt-animation-timeline

A blender-style timeline widget for qt to edit animations.

Controls

Action	Mouse/Key binding	Region
New Keyframe	Double click	Track
Select Keyframe	Click	Keyframe
Select multiple	Ctrl + Click	Keyframe
Select with box	Shift + Click	Tracks
Delete selected	Del	-
Move Selected Keyframes	Drag	Keyframe
Move whole track	Drag	Track Line
Change easing function	Right Click	Track Line or Keyframe
Scrub playhead	Drag	Header
Select play range	Shift + Drag	Header
Play/Pause animation	Space	-

Usage

The widget takes a mapping of track names to python objects and attribute names, allowing automatic setting of the interpolated values of such object given the current state of the animation model.

The widget is designed to work with nested dataclass/pydantic style models, but will work just fine with anything else non-nested.

from pydantic import BaseModel
from qt_animation_timeline import AnimationTimelineWidget

class Circle(BaseModel):
    color: tuple[int, int, int] = (255, 0, 0)
    size: float = 10
    filled: bool = True
    other_stuff: str = "thing"

circle = Circle()

# mapping of names of tracks to a tuple of object/attribute
# any time a change in the animation occur, the object's attribute
# will be updated with the new interpolated value.
track_options = {
    'color': (circle, 'color'),
    'size': (circle, 'size')
}

timeline = AnimationTimelineWidget(track_options=track_options)
timeline.show()

This will allow to animate the color and size, updating the model accordingly when the playhead scrubs along the animation.

When a keyframe is created manually, it will inherit the current model value for the given attribute.

Note that this also works for nested models whenever possible:

class CircleSet(BaseModel):
    circle1: Circle = Circle()
    circle2: Circle = Circle()

circleset = CircleSet()

track_options = {
    'circle 1': (circleset, 'circle1'),
    'circle 2 size': (circleset, 'circle2.size')  # or (circleset.circle2, size)
}
timeline = AnimationTimelineWidget(track_options=track_options)
timeline.show()

In this case, the whole model is considered the keyframe value, and all its elements will be interpolated.

Development

The easiest way to get started is to use the github cli and uv:

gh repo fork brisvag/qt-animation-timeline --clone
# or just
# gh repo clone brisvag/qt-animation-timeline
cd qt-animation-timeline
uv sync

Run tests:

uv run pytest

Lint files:

uv run pre-commit run --all-files