Trait avalanche::renderer::Renderer

pub trait Renderer {
    fn create_component(
        &mut self, 
        native_type: &NativeType, 
        component: &View
    ) -> NativeHandle;
    fn append_child(
        &mut self, 
        parent_type: &NativeType, 
        parent_handle: &mut NativeHandle, 
        child_type: &NativeType, 
        child_handle: &NativeHandle
    );
    fn insert_child(
        &mut self, 
        parent_type: &NativeType, 
        parent_handle: &mut NativeHandle, 
        index: usize, 
        child_type: &NativeType, 
        child_handle: &NativeHandle
    );
    fn replace_child(
        &mut self, 
        parent_type: &NativeType, 
        parent_handle: &mut NativeHandle, 
        index: usize, 
        child_type: &NativeType, 
        child_handle: &NativeHandle
    );
    fn swap_children(
        &mut self, 
        parent_type: &NativeType, 
        parent_handle: &mut NativeHandle, 
        a: usize, 
        b: usize
    );
    fn move_child(
        &mut self, 
        parent_type: &NativeType, 
        parent_handle: &mut NativeHandle, 
        old: usize, 
        new: usize
    );
    fn remove_child(
        &mut self, 
        parent_type: &NativeType, 
        parent_handle: &mut NativeHandle, 
        index: usize
    );
    fn update_component(
        &mut self, 
        native_type: &NativeType, 
        native_handle: &mut NativeHandle, 
        component: &View
    );

    fn log(&self, _string: &str) { ... }
}

The interface through which avalanche updates the native UI as described by changes to components. This allows avalanche to be platform-agnostic.

Required methods

fn create_component(
    &mut self,
    native_type: &NativeType,
    component: &View
) -> NativeHandle

Given a component and its native type, generate its native representation and return an opaque NativeHandle to it.

fn append_child(
    &mut self,
    parent_type: &NativeType,
    parent_handle: &mut NativeHandle,
    child_type: &NativeType,
    child_handle: &NativeHandle
)

Appends the component with handle child_handle into the component with handle parent_handle’s children.

fn insert_child(
    &mut self,
    parent_type: &NativeType,
    parent_handle: &mut NativeHandle,
    index: usize,
    child_type: &NativeType,
    child_handle: &NativeHandle
)

Inserts the component with handle child_handle into the component with handle parent_handle’s children at the given index, shifting all children after it to the right.

Panics

Panics if index > len, where len is the number of children the parent has.

fn replace_child(
    &mut self,
    parent_type: &NativeType,
    parent_handle: &mut NativeHandle,
    index: usize,
    child_type: &NativeType,
    child_handle: &NativeHandle
)

Replaces the component at position index with the native component with handle child_handle. The implementation should implement replacing a component with itself as a noop.

Panics

Panics if index > len - 1, where len is the number of children the parent has.

fn swap_children(
    &mut self,
    parent_type: &NativeType,
    parent_handle: &mut NativeHandle,
    a: usize,
    b: usize
)

Swaps the children at indices a and b.

Panics

Panics if a or b are less than len, where len is the number of children the parent has.

fn move_child(
    &mut self,
    parent_type: &NativeType,
    parent_handle: &mut NativeHandle,
    old: usize,
    new: usize
)

Moves the child at position old to the position new.

Panics

Panics if old < len or new < len where len is the number of children

fn remove_child(
    &mut self,
    parent_type: &NativeType,
    parent_handle: &mut NativeHandle,
    index: usize
)

Removes the component with the given index from the component with handle parent_handle.

fn update_component(
    &mut self,
    native_type: &NativeType,
    native_handle: &mut NativeHandle,
    component: &View
)

Updates the component’s corresponding native handle so that the representation and result match.

Provided methods

fn log(&self, _string: &str)

Logs the given string to a platform-appropriate destination. This method is a placeholder, and may either be elaborated or replaced with the log crate

Implementors