Struct gtk4::TreeRowReference

pub struct TreeRowReference(_);

A GtkTreeRowReference tracks model changes so that it always refers to the same row (a TreePath refers to a position, not a fixed row). Create a new GtkTreeRowReference with new().

Implementations

impl TreeRowReference

pub fn new<P: IsA<TreeModel>>(
    model: &P,
    path: &TreePath
) -> Option<TreeRowReference>

Creates a row reference based on path.

This reference will keep pointing to the node pointed to by path, so long as it exists. Any changes that occur on model are propagated, and the path is updated appropriately. If path isn’t a valid path in model, then None is returned.

model

a TreeModel

path

a valid TreePath to monitor

Returns

a newly allocated TreeRowReference

pub fn new_proxy<P: IsA<Object>, Q: IsA<TreeModel>>(
    proxy: &P,
    model: &Q,
    path: &TreePath
) -> Option<TreeRowReference>

You do not need to use this function.

Creates a row reference based on path.

This reference will keep pointing to the node pointed to by path, so long as it exists. If path isn’t a valid path in model, then None is returned. However, unlike references created with new(), it does not listen to the model for changes. The creator of the row reference must do this explicitly using inserted(), deleted(), reordered().

These functions must be called exactly once per proxy when the corresponding signal on the model is emitted. This single call updates all row references for that proxy. Since built-in GTK objects like TreeView already use this mechanism internally, using them as the proxy object will produce unpredictable results. Further more, passing the same object as model and proxy doesn’t work for reasons of internal implementation.

This type of row reference is primarily meant by structures that need to carefully monitor exactly when a row reference updates itself, and is not generally needed by most applications.

proxy

a proxy GObject

model

a TreeModel

path

a valid TreePath to monitor

Returns

a newly allocated TreeRowReference

pub fn model(&self) -> TreeModel

Returns the model that the row reference is monitoring.

Returns

the model

pub fn path(&self) -> Option<TreePath>

Returns a path that the row reference currently points to, or None if the path pointed to is no longer valid.

Returns

a current path

pub fn valid(&self) -> bool

Returns true if the self is non-None and refers to a current valid path.

Returns

true if self points to a valid path

pub fn deleted<P: IsA<Object>>(proxy: &P, path: &TreePath)

Lets a set of row reference created by new_proxy() know that the model emitted the ::row-deleted signal.

proxy

a GObject

path

the path position that was deleted

pub fn inserted<P: IsA<Object>>(proxy: &P, path: &TreePath)

Lets a set of row reference created by new_proxy() know that the model emitted the ::row-inserted signal.

proxy

a GObject

path

the row position that was inserted

impl TreeRowReference

pub fn reordered<P: IsA<Object>>(
    &self,
    proxy: &P,
    path: &TreePath,
    iter: &TreeIter,
    new_order: &[i32]
)

Lets a set of row reference created by new_proxy() know that the model emitted the ::rows-reordered signal.

proxy

a GObject

path

the parent path of the reordered signal

iter

the iter pointing to the parent of the reordered

new_order

the new order of rows

Trait Implementations

impl Clone for TreeRowReference

fn clone(&self) -> TreeRowReference

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TreeRowReference

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

Formats the value using the given formatter.

impl Hash for TreeRowReference

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl Ord for TreeRowReference

fn cmp(&self, other: &TreeRowReference) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<TreeRowReference> for TreeRowReference

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

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

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

This method tests for !=.

impl PartialOrd<TreeRowReference> for TreeRowReference

fn partial_cmp(&self, other: &TreeRowReference) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for TreeRowReference

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for TreeRowReference

impl StructuralEq for TreeRowReference

impl StructuralPartialEq for TreeRowReference