Graphics.UI.Gtk.Multiline.TextMark

gtk-0.12.4: Binding to the Gtk+ graphical user interface library.

Portability | portable (depends on GHC)
Stability | provisional
Maintainer | gtk2hs-users@lists.sourceforge.net
Safe Haskell | None

Graphics.UI.Gtk.Multiline.TextMark

Contents

- Detail
- Class Hierarchy
- Types
- Constructors
- Methods
- Attributes

Description

A position in the buffer preserved across buffer modifications

Synopsis

- data TextMark
- class GObjectClass o => TextMarkClass o
- castToTextMark :: GObjectClass obj => obj -> TextMark
- gTypeTextMark :: GType
- toTextMark :: TextMarkClass o => o -> TextMark
- type MarkName = String
- textMarkNew :: Maybe MarkName -> Bool -> IO TextMark
- textMarkSetVisible :: TextMarkClass self => self -> Bool -> IO ()
- textMarkGetVisible :: TextMarkClass self => self -> IO Bool
- textMarkGetDeleted :: TextMarkClass self => self -> IO Bool
- textMarkGetName :: TextMarkClass self => self -> IO (Maybe MarkName)
- textMarkGetBuffer :: TextMarkClass self => self -> IO (Maybe TextBuffer)
- textMarkGetLeftGravity :: TextMarkClass self => self -> IO Bool
- textMarkVisible :: TextMarkClass self => Attr self Bool

# Detail

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 `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.

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.

# Class Hierarchy

     | GObject
     | +----TextMark

# Types

data TextMark

Instances

Eq TextMark |
Ord TextMark |
GObjectClass TextMark |
TextMarkClass TextMark |

class GObjectClass o => TextMarkClass o

Instances

TextMarkClass TextMark |

castToTextMark :: GObjectClass obj => obj -> TextMark

gTypeTextMark :: GType

toTextMark :: TextMarkClass o => o -> TextMark

type MarkName = String

The name of a mark.

# Constructors

textMarkNew

Arguments

:: Maybe MarkName | `markName` - name for mark, or `Nothing`
-> Bool | `leftGravity` - whether the mark has left gravity
-> IO 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 this 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).

- Available since Gtk+ version 2.12

# Methods

textMarkSetVisible :: TextMarkClass self => self -> Bool -> IO ()

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.

textMarkGetVisible :: TextMarkClass self => self -> IO Bool

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

textMarkGetDeleted :: TextMarkClass self => self -> IO Bool

Returns `True` if the mark has been removed from its buffer with `textBufferDeleteMark`. Marks can't be used once deleted.

textMarkGetName :: TextMarkClass self => self -> IO (Maybe MarkName)

Returns the mark name; returns `Nothing` for anonymous marks.

textMarkGetBuffer :: TextMarkClass self => self -> IO (Maybe TextBuffer)

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

textMarkGetLeftGravity :: TextMarkClass self => self -> IO Bool

Determines whether the mark has left gravity.

The name is misleading as Arabic, Hebrew and some other languages have the beginning of a line towards the right.

# Attributes

textMarkVisible :: TextMarkClass self => Attr self Bool

The 'visible' property. See `textMarkGetVisible` and `textMarkSetVisible`