Struct gtk4::TextMark[][src]

pub struct TextMark(_);
Expand description

A TextMark is a position in a GtkTextbuffer that is preserved across modifications.

You may wish to begin by reading the text widget conceptual overview, which gives an overview of all the objects and data types related to the text widget and how they work together.

A TextMark is like a bookmark in a text buffer; it preserves a position in the text. You can convert the mark to an iterator using TextBufferExt::iter_at_mark(). Unlike iterators, marks remain valid across buffer mutations, because their behavior is defined when text is inserted or deleted. When text containing a mark is deleted, the mark remains in the position originally occupied by the deleted text. When text is inserted at a mark, a mark with “left gravity” will be moved to the beginning of the newly-inserted text, and a mark with “right gravity” will be moved to the end.

Note that “left” and “right” here refer to logical direction (left is the toward the start of the buffer); in some languages such as Hebrew the logically-leftmost text is not actually on the left when displayed.

Marks are reference counted, but the reference count only controls the validity of the memory; marks can be deleted from the buffer at any time with TextBufferExt::delete_mark(). Once deleted from the buffer, a mark is essentially useless.

Marks optionally have names; these can be convenient to avoid passing the TextMark object around.

Marks are typically created using the TextBufferExt::create_mark() function.

Implements

TextMarkExt, glib::ObjectExt

Implementations

Creates a text mark.

Add it to a buffer using TextBufferExt::add_mark(). If name is None, the mark is anonymous; otherwise, the mark can be retrieved by name using TextBufferExt::mark(). If a mark has left gravity, and text is inserted at the mark’s current location, the mark will be moved to the left of the newly-inserted text. If the mark has right gravity (left_gravity = false), the mark will end up on the right of newly-inserted text. The standard left-to-right cursor is a mark with right gravity (when you type, the cursor stays on the right side of the text you’re typing).

name

mark name or None

left_gravity

whether the mark should have left gravity

Returns

new TextMark

Creates a new builder-pattern struct instance to construct TextMark objects.

This method returns an instance of TextMarkBuilder which can be used to create TextMark objects.

Trait Implementations

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Returns the type identifier of Self.

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