Trait VirtualizingPanelImpl

Source

pub trait VirtualizingPanelImpl: PanelImpl + Upcast<VirtualizingPanel> {
    // Provided methods
    fn scroll_into_view(this: &Self, index: i32) -> Option<Ref<Control>> { ... }
    fn container_from_index(this: &Self, index: i32) -> Option<Ref<Control>> { ... }
    fn index_from_container(this: &Self, container: &Ref<Control>) -> i32 { ... }
    fn get_realized_containers(this: &Self) -> Option<Vec<Ref<Control>>> { ... }
    fn get_control_in_direction(
        this: &Self,
        direction: NavigationDirection,
        from: Option<&Ref<InputElement>>,
        wrap: bool,
    ) -> Option<Ref<InputElement>> { ... }
    fn on_items_control_changed(
        this: &Self,
        old_value: Option<&Ref<ItemsControl>>,
    ) { ... }
    fn on_items_changed(
        this: &Self,
        items: &Rc<ItemsSourceView>,
        e: &ItemsChangedEventArgs<'_>,
    ) { ... }
}

Expand description

The overridable members introduced by the class.

Provided Methods§

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fn scroll_into_view(this: &Self, index: i32) -> Option<Ref<Control>>

Scrolls the specified item into view.

Returns the element with the specified index, or None if the element could not be brought into view.

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fn container_from_index(this: &Self, index: i32) -> Option<Ref<Control>>

Returns the container for the item at the specified index.

Returns the container for the item at the specified index within the item collection, if the item is realized; otherwise, None.

Note for implementors: if the item at the specified index is an item-is-self-container item that has previously been realized, then the item should be returned even if it currently falls outside the realized viewport.

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fn index_from_container(this: &Self, container: &Ref<Control>) -> i32

Returns the index to the item that has the specified realized container.

Returns the index to the item that corresponds to the specified realized container, or -1 if container is not found.

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fn get_realized_containers(this: &Self) -> Option<Vec<Ref<Control>>>

Gets the currently realized containers.

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fn get_control_in_direction( this: &Self, direction: NavigationDirection, from: Option<&Ref<InputElement>>, wrap: bool, ) -> Option<Ref<InputElement>>

Gets the next control in the specified direction.

from is the control from which movement begins and wrap tells whether to wrap around when the first or last item is reached.

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fn on_items_control_changed(this: &Self, old_value: Option<&Ref<ItemsControl>>)

Called when the ItemsControl that owns the panel changes.

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fn on_items_changed( this: &Self, items: &Rc<ItemsSourceView>, e: &ItemsChangedEventArgs<'_>, )

Called when the items collection of the owner ItemsControl changes.

This method is called a collection changed event is raised by the items, or when the items property of the items control is set to a new collection, in which case the action will be a reset.