Struct qt_widgets::q_graphics_scene::ItemIndexMethod

#[repr(transparent)]
pub struct ItemIndexMethod(_);

This enum describes the indexing algorithms QGraphicsScene provides for managing positional information about items on the scene.

C++ enum: QGraphicsScene::ItemIndexMethod.

C++ documentation:

This enum describes the indexing algorithms QGraphicsScene provides for managing positional information about items on the scene.

See also setItemIndexMethod() and bspTreeDepth.

Methods

impl ItemIndexMethod

pub fn to_int(&self) -> c_int

impl ItemIndexMethod

pub const BspTreeIndex: ItemIndexMethod

A Binary Space Partitioning tree is applied. All QGraphicsScene's item location algorithms are of an order close to logarithmic complexity, by making use of binary search. Adding, moving and removing items is logarithmic. This approach is best for static scenes (i.e., scenes where most items do not move). (C++ enum variant: BspTreeIndex = 0)

pub const NoIndex: ItemIndexMethod

No index is applied. Item location is of linear complexity, as all items on the scene are searched. Adding, moving and removing items, however, is done in constant time. This approach is ideal for dynamic scenes, where many items are added, moved or removed continuously. (C++ enum variant: NoIndex = -1)

Trait Implementations

impl Eq for ItemIndexMethod

impl Clone for ItemIndexMethod

fn clone(&self) -> ItemIndexMethod

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq<ItemIndexMethod> for ItemIndexMethod

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl From<i32> for ItemIndexMethod

fn from(value: c_int) -> Self

Performs the conversion.

impl From<ItemIndexMethod> for c_int

fn from(value: ItemIndexMethod) -> Self

Performs the conversion.

impl Copy for ItemIndexMethod

impl Debug for ItemIndexMethod

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

Formats the value using the given formatter.