gi-gtk-4.0.11: Gtk bindings
CopyrightWill Thompson and Iñaki García Etxebarria
LicenseLGPL-2.1
MaintainerIñaki García Etxebarria
Safe HaskellNone
LanguageHaskell2010

GI.Gtk.Objects.TextMark

Description

A GtkTextMark 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 GtkTextMark is like a bookmark in a text buffer; it preserves a position in the text. You can convert the mark to an iterator using textBufferGetIterAtMark. 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 textBufferDeleteMark. Once deleted from the buffer, a mark is essentially useless.

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

Marks are typically created using the textBufferCreateMark function.

Synopsis

Exported types

newtype TextMark Source #

Memory-managed wrapper type.

Constructors

TextMark (ManagedPtr TextMark) 

Instances

Instances details
Eq TextMark Source # 
Instance details

Defined in GI.Gtk.Objects.TextMark

GObject TextMark Source # 
Instance details

Defined in GI.Gtk.Objects.TextMark

ManagedPtrNewtype TextMark Source # 
Instance details

Defined in GI.Gtk.Objects.TextMark

TypedObject TextMark Source # 
Instance details

Defined in GI.Gtk.Objects.TextMark

Methods

glibType :: IO GType #

HasParentTypes TextMark Source # 
Instance details

Defined in GI.Gtk.Objects.TextMark

IsGValue (Maybe TextMark) Source #

Convert TextMark to and from GValue. See toGValue and fromGValue.

Instance details

Defined in GI.Gtk.Objects.TextMark

type ParentTypes TextMark Source # 
Instance details

Defined in GI.Gtk.Objects.TextMark

class (GObject o, IsDescendantOf TextMark o) => IsTextMark o Source #

Type class for types which can be safely cast to TextMark, for instance with toTextMark.

Instances

Instances details
(GObject o, IsDescendantOf TextMark o) => IsTextMark o Source # 
Instance details

Defined in GI.Gtk.Objects.TextMark

toTextMark :: (MonadIO m, IsTextMark o) => o -> m TextMark Source #

Cast to TextMark, for types for which this is known to be safe. For general casts, use castTo.

Methods

getBuffer

textMarkGetBuffer Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a) 
=> a

mark: a GtkTextMark

-> m (Maybe TextBuffer)

Returns: the mark’s GtkTextBuffer

Gets the buffer this mark is located inside.

Returns Nothing if the mark is deleted.

getDeleted

textMarkGetDeleted Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a) 
=> a

mark: a GtkTextMark

-> m Bool

Returns: whether the mark is deleted

Returns True if the mark has been removed from its buffer.

See textBufferAddMark for a way to add it to a buffer again.

getLeftGravity

textMarkGetLeftGravity Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a) 
=> a

mark: a GtkTextMark

-> m Bool

Returns: True if the mark has left gravity, False otherwise

Determines whether the mark has left gravity.

getName

textMarkGetName Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a) 
=> a

mark: a GtkTextMark

-> m (Maybe Text)

Returns: mark name

Returns the mark name.

Returns Nothing for anonymous marks.

getVisible

textMarkGetVisible Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a) 
=> a

mark: a GtkTextMark

-> m Bool

Returns: True if visible

Returns True if the mark is visible.

A cursor is displayed for visible marks.

new

textMarkNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Maybe Text

name: mark name

-> Bool

leftGravity: whether the mark should have left gravity

-> m TextMark

Returns: new GtkTextMark

Creates a text mark.

Add it to a buffer using textBufferAddMark. If name is Nothing, the mark is anonymous; otherwise, the mark can be retrieved by name using textBufferGetMark. 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 (leftGravity = 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).

setVisible

textMarkSetVisible Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a) 
=> a

mark: a GtkTextMark

-> Bool

setting: visibility of mark

-> m () 

Sets the visibility of mark.

The insertion point is normally visible, i.e. you can see it as a vertical bar. Also, the text widget uses a visible mark to indicate where a drop will occur when dragging-and-dropping text. Most other marks are not visible.

Marks are not visible by default.

Properties

leftGravity

Whether the mark has left gravity.

When text is inserted at the mark’s current location, if the mark has left gravity it will be moved to the left of the newly-inserted text, otherwise to the right.

constructTextMarkLeftGravity :: (IsTextMark o, MonadIO m) => Bool -> m (GValueConstruct o) Source #

Construct a GValueConstruct with valid value for the “left-gravity” property. This is rarely needed directly, but it is used by new.

getTextMarkLeftGravity :: (MonadIO m, IsTextMark o) => o -> m Bool Source #

Get the value of the “left-gravity” property. When overloading is enabled, this is equivalent to

get textMark #leftGravity

name

The name of the mark or Nothing if the mark is anonymous.

constructTextMarkName :: (IsTextMark o, MonadIO m) => Text -> m (GValueConstruct o) Source #

Construct a GValueConstruct with valid value for the “name” property. This is rarely needed directly, but it is used by new.

getTextMarkName :: (MonadIO m, IsTextMark o) => o -> m (Maybe Text) Source #

Get the value of the “name” property. When overloading is enabled, this is equivalent to

get textMark #name