Struct ColorBarElement 

pub struct ColorBarElement;

The colourbar strip.

Carries no side of its own: the bar’s side lives in Config.colorbar, and a copy here would be a mirror that can disagree with what is drawn. That is also why the resize handles map to screen-side edges (Element::ColorBarEdge) and let nudge resolve which dimension each one drives.

Trait Implementations

impl Clone for ColorBarElement

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColorBarElement

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

Formats the value using the given formatter.

impl Draggable for ColorBarElement

fn nudge_element(&self) -> Element

The nudge-path element this drag target moves. This mapping is the only thing an implementation defines; movement itself happens in Self::drag_by.

fn drag_by(&self, cfg: &mut C, dx: f32, dy: f32) -> NudgeResult

Default drag pipeline: apply the pointer delta through Config::nudge. Returns NudgeResult::Rejected (and leaves cfg untouched) when the move would leave the chart area.

impl PartialEq for ColorBarElement

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

Equality operator ==.

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

Inequality operator !=.

impl Resizable for ColorBarElement

fn resize_targets( &self, handle: ResizeHandle, ) -> (Option<Element>, Option<Element>)

Each handle drives the strip edges it touches — the same compass mapping the data area uses. Which of thickness_px / length_frac an edge changes depends on the bar’s orientation, and that resolution belongs to nudge: a handle only knows screen directions.

fn resize_handles( &self, cfg: &C, measure: &dyn MeasureText, ) -> Option<[(ResizeHandle, RectF); 8]>

Default handle geometry: eight squares on the selection box (element bounds + SELECTION_PADDING).

fn hit_resize_handle( &self, cfg: &C, measure: &dyn MeasureText, x: f32, y: f32, ) -> Option<ResizeHandle>

Default handle hit test.

fn resize_by( &self, cfg: &mut C, handle: ResizeHandle, dx: f32, dy: f32, ) -> NudgeResult

Default resize pipeline: each motion component routes through Config::nudge on its target element, so resize obeys exactly the same feasibility rules as dragging those elements directly.

impl Selectable for ColorBarElement

fn bounds(&self, cfg: &Config, _measure: &dyn MeasureText) -> Option<RectF>

The strip rect — the same one the renderer paints, offsets included, so the highlight box and the eight handles sit on the bar the user sees. Ticks and labels are outside it, as they are for an axis.

fn element_id(&self) -> String

Stable element name for hosts that key on identity rather than HitId (e.g. a wasm host exposing hit-testing as strings): "data_area", "axis_bottom", "tick_labels_left", "axis_title_left", "legend", "chart_title", "colorbar_axis", "colorbar_tick_labels", "colorbar_title". Custom host elements keep the default.

fn as_draggable(&self) -> Option<&dyn Draggable>

This element’s drag capability, if any. Elements that also implement Draggable override this with Some(self). Lets hosts go from a HitMap hit straight to dragging without knowing concrete types.

fn as_resizable(&self) -> Option<&dyn Resizable>

This element’s resize capability, if any. Elements that also implement Resizable override this with Some(self) — their selection box then grows the eight resize handles automatically.

fn selection_box( &self, cfg: &C, measure: &dyn MeasureText, ) -> Option<SelectionBox>

Default selection policy: a blue box SELECTION_PADDING px outside the bounds, stroked SELECTION_STROKE_WIDTH px in SELECTION_COLOR. Resizable elements additionally carry the eight resize handle squares.

fn contains(&self, cfg: &C, measure: &dyn MeasureText, x: f32, y: f32) -> bool

Default hit test: point-in-bounds.

fn register_into(self, map: &mut HitMap<C>) -> HitId

where Self: Sized + Send + Sync + 'static,

Default registration: every Selectable can enter a HitMap the same way. Returns the id the map will report from hit_test. (Send + Sync because hosts store hit maps in cross-thread render state, e.g. egui’s CallbackResources.)

impl StructuralPartialEq for ColorBarElement