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.ModelView.TreeStore

Contents

- Types
- Constructors
- Implementation of Interfaces
- Methods

Description

Standard model to store hierarchical data.

Synopsis

- data TreeStore a
- treeStoreNew :: Forest a -> IO (TreeStore a)
- treeStoreNewDND :: Forest a -> Maybe (DragSourceIface TreeStore a) -> Maybe (DragDestIface TreeStore a) -> IO (TreeStore a)
- treeStoreDefaultDragSourceIface :: DragSourceIface TreeStore row
- treeStoreDefaultDragDestIface :: DragDestIface TreeStore row
- treeStoreGetValue :: TreeStore a -> TreePath -> IO a
- treeStoreGetTree :: TreeStore a -> TreePath -> IO (Tree a)
- treeStoreLookup :: TreeStore a -> TreePath -> IO (Maybe (Tree a))
- treeStoreSetValue :: TreeStore a -> TreePath -> a -> IO ()
- treeStoreInsert :: TreeStore a -> TreePath -> Int -> a -> IO ()
- treeStoreInsertTree :: TreeStore a -> TreePath -> Int -> Tree a -> IO ()
- treeStoreInsertForest :: TreeStore a -> TreePath -> Int -> Forest a -> IO ()
- treeStoreRemove :: TreeStore a -> TreePath -> IO Bool
- treeStoreClear :: TreeStore a -> IO ()
- treeStoreChange :: TreeStore a -> TreePath -> (a -> a) -> IO Bool
- treeStoreChangeM :: TreeStore a -> TreePath -> (a -> IO a) -> IO Bool

# Types

data TreeStore a

A store for hierarchical data.

Instances

TypedTreeModelClass TreeStore |
GObjectClass (TreeStore a) |
TreeModelClass (TreeStore a) |

# Constructors

treeStoreNew :: Forest a -> IO (TreeStore a)

Create a new list store.

- The given rose tree determines the initial content and may be the empty list. Each `Tree` in the forest corresponds to one top-level node.

treeStoreNewDND

Arguments

:: Forest a | the inital tree stored in this model
-> Maybe (DragSourceIface TreeStore a) | an optional interface for drags
-> Maybe (DragDestIface TreeStore a) | an optional interface to handle drops
-> IO (TreeStore a) |

Create a new list store.

- In addition to `treeStoreNew`, this function takes an two interfaces to implement user-defined drag-and-drop functionality.

# Implementation of Interfaces

treeStoreDefaultDragSourceIface :: DragSourceIface TreeStore row

Default drag functions for `TreeStore`. These functions allow the rows of the model to serve as drag source. Any row is allowed to be dragged and the data set in the `SelectionDataM` object is set with `treeSetRowDragData`, i.e. it contains the model and the `TreePath` to the row.

treeStoreDefaultDragDestIface :: DragDestIface TreeStore row

Default drop functions for `TreeStore`. These functions accept a row and insert the row into the new location if it is dragged into a tree view that uses the same model.

# Methods

treeStoreGetValue :: TreeStore a -> TreePath -> IO a

Extract one node from the current model. Fails if the given `TreePath` refers to a non-existent node.

treeStoreGetTree :: TreeStore a -> TreePath -> IO (Tree a)

Extract a subtree from the current model. Fails if the given `TreePath` refers to a non-existent node.

treeStoreLookup :: TreeStore a -> TreePath -> IO (Maybe (Tree a))

Extract a subtree from the current model. Like `treeStoreGetTree` but returns `Nothing` if the path refers to a non-existant node.

treeStoreSetValue :: TreeStore a -> TreePath -> a -> IO ()

Set a node in the store.

treeStoreInsert

Arguments

:: TreeStore a | the store
-> TreePath | `path` - the position of the parent
-> Int | `pos` - the index of the new tree
-> a | the value to be inserted
-> IO () |

Insert a single node into the store.

- This function inserts a single node without children into the tree. Its arguments are similar to those of `treeStoreInsert`.

treeStoreInsertTree

Arguments

:: TreeStore a | the store
-> TreePath | `path` - the position of the parent
-> Int | `pos` - the index of the new tree
-> Tree a | the value to be inserted
-> IO () |

Insert a node into the store.

treeStoreInsertForest

Arguments

:: TreeStore a | the store
-> TreePath | `path` - the position of the parent
-> Int | `pos` - the index of the new tree
-> Forest a | the list of trees to be inserted
-> IO () |

Insert nodes into the store.

- The given list of nodes is inserted into given parent at `pos`. If the parent existed, the function returns `Just path` where `path` is the position of the newly inserted elements. If `pos` is negative or greater or equal to the number of children of the node at `path`, the new nodes are appended to the list.

treeStoreRemove :: TreeStore a -> TreePath -> IO Bool

Remove a node from the store.

- The node denoted by the path is removed, along with all its children. The function returns `True` if the given node was found.

treeStoreClear :: TreeStore a -> IO ()

treeStoreChange :: TreeStore a -> TreePath -> (a -> a) -> IO Bool

Change a node in the store.

- Returns `True` if the node was found. For a monadic version, see `treeStoreChangeM`.

treeStoreChangeM :: TreeStore a -> TreePath -> (a -> IO a) -> IO Bool

Change a node in the store.

- Returns `True` if the node was found. For a purely functional version, see `treeStoreChange`.