Struct gtk4::TreeRowReference[][src]

pub struct TreeRowReference(_);
Expand description

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

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-struct to monitor

Returns

a newly allocated TreeRowReference, or None

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 glib::Object

model

a TreeModel

path

a valid TreePath-struct to monitor

Returns

a newly allocated TreeRowReference, or None

Returns the model that the row reference is monitoring.

Returns

the model

Returns a path that the row reference currently points to, or None if the path pointed to is no longer valid.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

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

Returns

true if self points to a valid path

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

proxy

a glib::Object

path

the path position that was deleted

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

proxy

a glib::Object

path

the row position that was inserted

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

proxy

a glib::Object

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

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