Copyright	Will Thompson Iñaki García Etxebarria and Jonas Platte
License	LGPL-2.1
Maintainer	Iñaki García Etxebarria
Safe Haskell	None
Language	Haskell2010

GI.Gtk.Objects.TextMark

Contents

Exported types
Methods
Properties
- leftGravity
- name

Description

You may wish to begin by reading the [text widget conceptual overview][TextWidget] 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 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 TextMark object around.

Marks are typically created using the textBufferCreateMark function.

Synopsis

newtype TextMark = TextMark (ManagedPtr TextMark)
class (GObject o, IsDescendantOf TextMark o) => IsTextMark o
toTextMark :: (MonadIO m, IsTextMark o) => o -> m TextMark
noTextMark :: Maybe TextMark
textMarkGetBuffer :: (HasCallStack, MonadIO m, IsTextMark a) => a -> m TextBuffer
textMarkGetDeleted :: (HasCallStack, MonadIO m, IsTextMark a) => a -> m Bool
textMarkGetLeftGravity :: (HasCallStack, MonadIO m, IsTextMark a) => a -> m Bool
textMarkGetName :: (HasCallStack, MonadIO m, IsTextMark a) => a -> m (Maybe Text)
textMarkGetVisible :: (HasCallStack, MonadIO m, IsTextMark a) => a -> m Bool
textMarkNew :: (HasCallStack, MonadIO m) => Maybe Text -> Bool -> m TextMark
textMarkSetVisible :: (HasCallStack, MonadIO m, IsTextMark a) => a -> Bool -> m ()
constructTextMarkLeftGravity :: IsTextMark o => Bool -> IO (GValueConstruct o)
getTextMarkLeftGravity :: (MonadIO m, IsTextMark o) => o -> m Bool
constructTextMarkName :: IsTextMark o => Text -> IO (GValueConstruct o)
getTextMarkName :: (MonadIO m, IsTextMark o) => o -> m (Maybe Text)

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 Methods (==) :: TextMark -> TextMark -> Bool # (/=) :: TextMark -> TextMark -> Bool #
IsGValue TextMark Source #	Convert `TextMark` to and from `GValue` with `toGValue` and `fromGValue`.
Instance details Defined in GI.Gtk.Objects.TextMark Methods toGValue :: TextMark -> IO GValue # fromGValue :: GValue -> IO TextMark #
GObject TextMark Source #
Instance details Defined in GI.Gtk.Objects.TextMark Methods gobjectType :: IO GType #
HasParentTypes TextMark Source #
Instance details Defined in GI.Gtk.Objects.TextMark
type ParentTypes TextMark Source #
Instance details Defined in GI.Gtk.Objects.TextMark type ParentTypes TextMark = '[Object]

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.

noTextMark :: Maybe TextMark Source #

A convenience alias for Nothing :: Maybe TextMark.

Methods

Overloaded methods

getBuffer

textMarkGetBuffer Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a)
=> a	`mark`: a `TextMark`
-> m TextBuffer	Returns: the mark’s `TextBuffer`

Gets the buffer this mark is located inside, or Nothing if the mark is deleted.

getDeleted

textMarkGetDeleted Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a)
=> a	`mark`: a `TextMark`
-> m Bool	Returns: whether the mark is deleted

Returns True if the mark has been removed from its buffer with textBufferDeleteMark. See textBufferAddMark for a way to add it to a buffer again.

getLeftGravity

textMarkGetLeftGravity Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a)
=> a	`mark`: a `TextMark`
-> 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 `TextMark`
-> m (Maybe Text)	Returns: mark name

Returns the mark name; returns NULL for anonymous marks.

getVisible

textMarkGetVisible Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a)
=> a	`mark`: a `TextMark`
-> m Bool	Returns: `True` if visible

Returns True if the mark is visible (i.e. a cursor is displayed for it).

new

textMarkNew Source #

Arguments

:: (HasCallStack, MonadIO m)
=> Maybe Text	`name`: mark name or `Nothing`
-> Bool	`leftGravity`: whether the mark should have left gravity
-> m TextMark	Returns: new `TextMark`

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).

Since: 2.12

setVisible

textMarkSetVisible Source #

Arguments

:: (HasCallStack, MonadIO m, IsTextMark a)
=> a	`mark`: a `TextMark`
-> 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 => Bool -> IO (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 => Text -> IO (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