Struct WidgetTreeChangedArgs 

pub struct WidgetTreeChangedArgs {
    pub timestamp: DInstant,
    pub prev_tree: WeakWidgetInfoTree,
    pub tree: WidgetInfoTree,
    pub is_update: bool,
    pub propagation: EventPropagationHandle,
}

WIDGET_TREE_CHANGED_EVENT args.

Fields

timestamp: DInstant

Instant the event happened.

prev_tree: WeakWidgetInfoTree

Previous widget tree.

The strong reference if only held for the duration event update duration, after it is dropped. It will also not upgrade if this event is the first for the window.

This is equal to tree if is_update.

tree: WidgetInfoTree

New widget tree.

is_update: bool

If it is the same tree, just render info updated.

Note that these changes are applied with interior mutability, so the tree shared reference will can be modified on the next render. To compare values save a copy.

Some values updated without tree rebuild are, widget transforms, widget visibility.

propagation: EventPropagationHandle

Propagation handle associated with this event instance.

Cloned arguments share the same handle, some arguments may also share the handle of another event if they share the same cause.

Implementations

impl WidgetTreeChangedArgs

pub fn new( timestamp: impl Into<DInstant>, propagation: EventPropagationHandle, prev_tree: impl Into<WeakWidgetInfoTree>, tree: impl Into<WidgetInfoTree>, is_update: impl Into<bool>, ) -> WidgetTreeChangedArgs

New args from values that convert into the argument types.

pub fn now( prev_tree: impl Into<WeakWidgetInfoTree>, tree: impl Into<WidgetInfoTree>, is_update: impl Into<bool>, ) -> WidgetTreeChangedArgs

Arguments for event that happened now (INSTANT.now).

Trait Implementations

impl AnyEventArgs for WidgetTreeChangedArgs

fn is_in_target(&self, _id: WidgetId) -> bool

Broadcast to all widgets.

fn timestamp(&self) -> DInstant

Instant this event update happened.

fn propagation(&self) -> &EventPropagationHandle

Propagation handle associated with this event instance.

fn clone_boxed(&self) -> Box<dyn AnyEventArgs>

Clone the args to a new box.

impl Clone for WidgetTreeChangedArgs

fn clone(&self) -> WidgetTreeChangedArgs

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WidgetTreeChangedArgs

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

Formats the value using the given formatter.

impl PartialEq for WidgetTreeChangedArgs

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl EventArgs for WidgetTreeChangedArgs

impl StructuralPartialEq for WidgetTreeChangedArgs