Struct DrawingInteraction 

pub struct DrawingInteraction {
    pub sel_drawing: Option<usize>,
    pub dragging_handle: Option<(usize, HandlePos)>,
    /* private fields */
}

Self-contained interaction handler for chart drawings.

Manages selection state, handle dragging, and hit testing. Unlike DrawingManager which coordinates all services, DrawingInteraction focuses purely on pointer-based interaction.

Fields

sel_drawing: Option<usize>

Currently selected drawing ID, or None.

dragging_handle: Option<(usize, HandlePos)>

Handle currently being dragged: (drawing_id, handle_position).

Implementations

impl DrawingInteraction

pub fn new() -> Self

Creates a new interaction handler with no selection and no active drag.

pub fn deselect(&mut self)

Clears the current drawing selection.

pub fn get_handles(&self, drawing: &Drawing) -> Vec<(HandlePos, Pos2)>

Returns the selection handle positions for a drawing, determined by its tool type (see HandleService::get_handles for the canonical implementation).

pub fn hit_test_handle( &self, point: Pos2, drawing: &Drawing, handle_size: f32, ) -> Option<HandlePos>

Hit-tests a screen point against the handles of a drawing.

Returns Some(HandlePos) if the point is within handle_size * 1.5 pixels of a handle center, None otherwise.

pub fn start_drag_handle(&mut self, drawing: &Drawing, handle: HandlePos)

Begins a handle drag operation, saving the drawing’s current state for undo.

pub fn take_drag_old_state(&mut self) -> Option<Drawing>

Takes the pre-drag drawing state for undo purposes. Consumes the stored snapshot, returning None on subsequent calls until a new drag begins.

pub fn end_drag_handle(&mut self) -> Option<Drawing>

Ends the handle drag operation, returning the pre-drag drawing state (for undo) and clearing the drag state.

pub fn is_dragging(&self) -> bool

Returns true if a handle drag is currently in progress.

pub fn get_drag_target(&self) -> Option<(usize, HandlePos)>

Returns the current drag target: (drawing_id, handle_position), or None if no drag is active.

pub fn render_handles( &self, painter: &Painter, drawing: &Drawing, options: &DrawingOptions, )

Renders selection handles for a drawing as filled squares with borders.

The actively dragged handle is highlighted with DrawingOptions::handle_sel_color.

pub fn hit_test( &self, point: Pos2, drawings: &[Drawing], timeframe: &str, ) -> Option<usize>

Hit-tests a screen point against all visible drawings, from the top layer down (descending z-order, and the later drawing first where the z-order is the same).

Returns the ID of the topmost drawing at point, or None if no drawing was hit. Respects visibility and per-timeframe visibility filtering. Uses tool-specific hit testing (line distance, rectangle containment, Fibonacci level proximity, etc.) with a 5-pixel tolerance.

pub fn hit_test_painted(point: Pos2, shapes: &[ClippedShape]) -> bool

Hit-tests the shapes painted for one drawing, including text extents and filled zones.

Pass the clipped shapes emitted by the renderer, excluding selection handles. The manager records them during render_all; standalone hosts can retain their own paint commands. Uses a five-pixel tolerance along strokes and respects every shape’s clip.

pub fn select_at( &mut self, point: Pos2, drawings: &[Drawing], timeframe: &str, ) -> bool

Hit-tests at point and selects the topmost drawing found.

Returns true if a drawing was selected, false if the click hit empty space (which deselects the current selection).

Trait Implementations

impl Default for DrawingInteraction

fn default() -> Self

Returns the “default value” for a type.