Struct kas_core::layout::RowPositionSolver

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pub struct RowPositionSolver<D: Directional> { /* private fields */ }

Expand description

Allows efficient implementations of draw / event handlers based on the layout representation.

This is only applicable where child widgets are contained in a slice of type W: Widget (which may be Box<dyn Widget>). In other cases, the naive implementation (test all items) must be used.

Implementations§

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impl<D: Directional> RowPositionSolver<D>

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pub fn new(direction: D) -> Self

Construct with given directionality

Examples found in repository ?

src/layout/visitor.rs (line 439)

    fn find_id(&mut self, coord: Coord) -> Option<WidgetId> {
        let solver = RowPositionSolver::new(self.direction);
        solver
            .find_child_mut(self.children, coord)
            .and_then(|child| child.find_id(coord))
    }

    fn draw(&mut self, mut draw: DrawMgr) {
        let solver = RowPositionSolver::new(self.direction);
        solver.for_children(self.children, draw.get_clip_rect(), |w| draw.recurse(w));
    }

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pub fn find_child_index<W: Widget>(
 self,
 widgets: &[W],
 coord: Coord
) -> Option<usize>

Find the child containing the given coordinates

Returns None when the coordinates lie within the margin area or outside of the parent widget.

Examples found in repository ?

src/layout/row_solver.rs (line 297)

    pub fn find_child<W: Widget>(self, widgets: &[W], coord: Coord) -> Option<&W> {
        self.find_child_index(widgets, coord).map(|i| &widgets[i])
    }

    /// Find the child containing the given coordinates
    ///
    /// Returns `None` when the coordinates lie within the margin area or
    /// outside of the parent widget.
    #[inline]
    pub fn find_child_mut<W: Widget>(self, widgets: &mut [W], coord: Coord) -> Option<&mut W> {
        self.find_child_index(widgets, coord)
            .map(|i| &mut widgets[i])
    }

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pub fn find_child<W: Widget>(self, widgets: &[W], coord: Coord) -> Option<&W>

Find the child containing the given coordinates

Returns None when the coordinates lie within the margin area or outside of the parent widget.

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pub fn find_child_mut<W: Widget>(
 self,
 widgets: &mut [W],
 coord: Coord
) -> Option<&mut W>

Find the child containing the given coordinates

Returns None when the coordinates lie within the margin area or outside of the parent widget.

Examples found in repository ?

src/layout/visitor.rs (line 441)

    fn find_id(&mut self, coord: Coord) -> Option<WidgetId> {
        let solver = RowPositionSolver::new(self.direction);
        solver
            .find_child_mut(self.children, coord)
            .and_then(|child| child.find_id(coord))
    }

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pub fn for_children<W: Widget, F: FnMut(&mut W)>(
 self,
 widgets: &mut [W],
 rect: Rect,
 f: F
)

Call f on each child intersecting the given rect

Examples found in repository ?

src/layout/visitor.rs (line 447)

    fn draw(&mut self, mut draw: DrawMgr) {
        let solver = RowPositionSolver::new(self.direction);
        solver.for_children(self.children, draw.get_clip_rect(), |w| draw.recurse(w));
    }