Struct EmptyW 

pub struct EmptyW;

Empty widget placeholder.

Trait Implementations

impl<X: GXExt> GuiWidget<X> for EmptyW

fn handle_update( &mut self, _rt: &Handle, _id: ExprId, _v: &Value, ) -> Result<bool>

Process a value update from graphix. Widgets that own child refs use rt to block_on recompilation of their subtree. Returns true if the widget changed and the window should redraw.

fn view(&self) -> IcedElement<'_>

Build the iced Element tree for rendering.

fn children_mut(&mut self) -> &mut [GuiW<X>]

Child widgets that on_message and before_view should forward to. Leaf widgets return &mut [] (the default). Containers (row, column, container, scrollable, stack, …) override this so that messages flow down to nested widgets like data_table — without it the event loop delivers messages to the window’s top-level widget only.

fn children(&self) -> &[GuiW<X>]

fn on_message(&mut self, msg: &Message, shell: &mut MessageShell) -> bool

Dispatch a message to the widget. Returns true if the widget changed and a redraw is needed. Widgets that emit follow-up messages (e.g. a Call fired from a column-resize drag) publish through shell. The default implementation forwards to children — containers don’t need to override.

fn is_column_resizing(&self) -> bool

True if this widget (or any descendant) is currently tracking a column-resize drag. The event loop polls this to decide whether a cursor-moved event should be routed as a drag update.

fn before_view(&mut self) -> bool

Called immediately before view() so widgets can flush deferred state that arrived asynchronously from background tasks (e.g. data_table re-sorting after sort-column subscription data arrives outside of the graphix update cycle). Returns true if state changed and the window should redraw. The default forwards to children so containers don’t have to.