|Portability||portable (depends on GHC)|
A position in the buffer preserved across buffer modifications
- 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
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.
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
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
|:: Maybe MarkName|
|-> IO TextMark|
Creates a text mark. Add it to a buffer using
Nothing, the mark is anonymous; otherwise, the mark can be retrieved by
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 (
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
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.
True if the mark is visible (i.e. a cursor is displayed for it)
True if the mark has been removed from its buffer with
textBufferDeleteMark. Marks can't
be used once deleted.
Returns the mark name; returns
Nothing for anonymous marks.
Gets the buffer this mark is located inside, or
Nothing if the mark is
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.