Struct ScrollState 

pub struct ScrollState {
    pub offset: f32,
    /* private fields */
}

Scroll offset plus scrollbar-drag state of one scrolling container.

Fields

offset: f32

Offset in GUI pixels (0 = top) — set it as the widget’s scroll_y.

Implementations

impl ScrollState

pub const fn new() -> ScrollState

pub fn is_dragging(&self) -> bool

The scrollbar knob is being dragged.

pub fn reset(&mut self)

Back to the top, ending any drag.

pub fn handle( &mut self, event: &str, view: &LayoutNode, wheel_step: f32, ) -> bool

Applies one UI event; view is the container’s node from the frame the user saw (UiRoot::find_node). wheel_step: pixels per wheel notch. Returns true when the event was for the scrollbar/wheel — the caller shouldn’t treat it as a click on the content.

• scroll:DY — wheel; positive = up.
• click:X:Y on the knob grabs it; on the track jumps there (knob centred on the cursor) and keeps dragging.
• drag:X:Y moves a grabbed knob; release:X:Y lets go.

pub fn handle_event( &mut self, event: &UiEvent<'_>, view: &LayoutNode, wheel_step: f32, ) -> bool

Self::handle for a parsed event.

pub fn scroll_into_view(&mut self, top: f32, h: f32, view_h: f32)

Scrolls the least amount that shows top..top + h (content coordinates, 0 = the content’s top) in a view view_h tall.

Trait Implementations

impl Clone for ScrollState

fn clone(&self) -> ScrollState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ScrollState

impl Debug for ScrollState

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for ScrollState

fn default() -> ScrollState

Returns the “default value” for a type.

impl PartialEq for ScrollState

fn eq(&self, other: &ScrollState) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ScrollState