Layer Video

app.ui.qt.widgets.preview.layer_video

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Module for layer video; implements the Qt presentation components.

See Also

• PreviewContainer — embeds the video view with annotation overlays
• PlaybackHandler — supplies playback updates

Layer: Presentation. Context: Implements the qt presentation components at this architectural boundary.

VideoDisplayWidget

Bases: QWidget

Provide the video display widget presentation component.

PARAMETER	DESCRIPTION
parent	Optional Qt parent object. TYPE: QWidget | None DEFAULT: None

pixmap_rect_changed = Signal(QRect, QSize) class-attribute instance-attribute

__init__(parent: QWidget | None = None) -> None

get_pixmap_rect() -> QRect

Return the image rectangle currently used for drawing.

RETURNS	DESCRIPTION
QRect	Current image rectangle in widget coordinates.

paintEvent(event: QPaintEvent) -> None

Paint the current video frame or status message.

PARAMETER	DESCRIPTION
event	Qt event being handled. (QPaintEvent). TYPE: QPaintEvent

reset_viewport() -> None

Restore 1× zoom and zero pan, then recompute and redraw the image.

resizeEvent(event: QResizeEvent) -> None

Update the viewport after the widget is resized.

PARAMETER	DESCRIPTION
event	Qt event being handled. (QResizeEvent). TYPE: QResizeEvent

set_image(image: QImage) -> None

Display an image, recompute its fitted rectangle, and redraw.

PARAMETER	DESCRIPTION
image	Image to display. TYPE: QImage

set_message(message: str) -> None

Clear the image and display a centered placeholder message.

PARAMETER	DESCRIPTION
message	Text to show when no image is available. TYPE: str

set_pan(dx: float, dy: float) -> None

Set the display offset in widget coordinates and redraw.

PARAMETER	DESCRIPTION
dx	Horizontal offset in pixels. TYPE: float
dy	Vertical offset in pixels. TYPE: float

set_zoom(factor: float) -> None

Set the display zoom, clamped to the range 1×–10×, and redraw.

PARAMETER	DESCRIPTION
factor	Requested zoom multiplier. TYPE: float