Enum MutationError 

pub enum MutationError {
    NoStrategy,
    NoFocusedPanel,
    FocusedNoParent,
    ParentNotContainer,
    PanelNoParent,
    OnlyChild,
    SiblingsNotPanels,
    SiblingsNotGrow,
    NoCollapsedSlots,
    SlotNoSavedConstraints,
    MoveNotSupported,
    SpanNotSupported,
    SpatialNavUnsupported,
}

A runtime mutation that cannot be applied in the current state.

Variants

NoStrategy

No strategy attached.

NoFocusedPanel

No panel is focused.

FocusedNoParent

Focused panel is the root (no parent container).

ParentNotContainer

Parent node is a leaf, not a container.

PanelNoParent

Panel’s parent not found in the tree.

OnlyChild

Panel is the sole child of its container.

SiblingsNotPanels

resize_boundary requires all siblings to be panel leaves.

SiblingsNotGrow

resize_boundary requires all siblings to use grow constraints.

NoCollapsedSlots

No panels are currently collapsed.

SlotNoSavedConstraints

Collapsed slot lost its saved constraints.

MoveNotSupported

Strategy does not support panel reordering.

SpanNotSupported

set_card_span requires a dashboard strategy.

SpatialNavUnsupported

Strategy does not support spatial focus — use focus_next/focus_prev.

Trait Implementations

impl Debug for MutationError

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

Formats the value using the given formatter.

impl Display for MutationError

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

Formats the value using the given formatter.

impl Error for MutationError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.