gi-gtk-3.0.27: Gtk bindings

CopyrightWill Thompson Iñaki García Etxebarria and Jonas Platte
LicenseLGPL-2.1
MaintainerIñaki García Etxebarria (garetxe@gmail.com)
Safe HaskellNone
LanguageHaskell2010

GI.Gtk.Objects.ListStore

Contents

Description

The ListStore object is a list model for use with a TreeView widget. It implements the TreeModel interface, and consequentialy, can use all of the methods available there. It also implements the TreeSortable interface so it can be sorted by the view. Finally, it also implements the tree [drag and drop][gtk3-GtkTreeView-drag-and-drop] interfaces.

The ListStore can accept most GObject types as a column type, though it can’t accept all custom types. Internally, it will keep a copy of data passed in (such as a string or a boxed pointer). Columns that accept GObjects are handled a little differently. The ListStore will keep a reference to the object instead of copying the value. As a result, if the object is modified, it is up to the application writer to call treeModelRowChanged to emit the TreeModel::row_changed signal. This most commonly affects lists with GdkPixbufs stored.

An example for creating a simple list store:

C code

enum {
  COLUMN_STRING,
  COLUMN_INT,
  COLUMN_BOOLEAN,
  N_COLUMNS
};

{
  GtkListStore *list_store;
  GtkTreePath *path;
  GtkTreeIter iter;
  gint i;

  list_store = gtk_list_store_new (N_COLUMNS,
                                   G_TYPE_STRING,
                                   G_TYPE_INT,
                                   G_TYPE_BOOLEAN);

  for (i = 0; i < 10; i++)
    {
      gchar *some_data;

      some_data = get_some_data (i);

      // Add a new row to the model
      gtk_list_store_append (list_store, &iter);
      gtk_list_store_set (list_store, &iter,
                          COLUMN_STRING, some_data,
                          COLUMN_INT, i,
                          COLUMN_BOOLEAN,  FALSE,
                          -1);

      // As the store will keep a copy of the string internally,
      // we free some_data.
      g_free (some_data);
    }

  // Modify a particular row
  path = gtk_tree_path_new_from_string ("4");
  gtk_tree_model_get_iter (GTK_TREE_MODEL (list_store),
                           &iter,
                           path);
  gtk_tree_path_free (path);
  gtk_list_store_set (list_store, &iter,
                      COLUMN_BOOLEAN, TRUE,
                      -1);
}

Performance Considerations

Internally, the ListStore was implemented with a linked list with a tail pointer prior to GTK+ 2.6. As a result, it was fast at data insertion and deletion, and not fast at random data access. The ListStore sets the GTK_TREE_MODEL_ITERS_PERSIST flag, which means that GtkTreeIters can be cached while the row exists. Thus, if access to a particular row is needed often and your code is expected to run on older versions of GTK+, it is worth keeping the iter around.

Atomic Operations

It is important to note that only the methods gtk_list_store_insert_with_values() and listStoreInsertWithValuesv are atomic, in the sense that the row is being appended to the store and the values filled in in a single operation with regard to TreeModel signaling. In contrast, using e.g. listStoreAppend and then gtk_list_store_set() will first create a row, which triggers the TreeModel::row-inserted signal on ListStore. The row, however, is still empty, and any signal handler connecting to TreeModel::row-inserted on this particular store should be prepared for the situation that the row might be empty. This is especially important if you are wrapping the ListStore inside a TreeModelFilter and are using a TreeModelFilterVisibleFunc. Using any of the non-atomic operations to append rows to the ListStore will cause the TreeModelFilterVisibleFunc to be visited with an empty row first; the function must be prepared for that.

GtkListStore as GtkBuildable

The GtkListStore implementation of the GtkBuildable interface allows to specify the model columns with a <columns> element that may contain multiple <column> elements, each specifying one model column. The “type” attribute specifies the data type for the column.

Additionally, it is possible to specify content for the list store in the UI definition, with the <data> element. It can contain multiple <row> elements, each specifying to content for one row of the list model. Inside a <row>, the <col> elements specify the content for individual cells.

Note that it is probably more common to define your models in the code, and one might consider it a layering violation to specify the content of a list store in a UI definition, data, not presentation, and common wisdom is to separate the two, as far as possible.

An example of a UI Definition fragment for a list store:

C code

<object class="GtkListStore">
  <columns>
    <column type="gchararray"/>
    <column type="gchararray"/>
    <column type="gint"/>
  </columns>
  <data>
    <row>
      <col id="0">John</col>
      <col id="1">Doe</col>
      <col id="2">25</col>
    </row>
    <row>
      <col id="0">Johan</col>
      <col id="1">Dahlin</col>
      <col id="2">50</col>
    </row>
  </data>
</object>
Synopsis

Exported types

newtype ListStore Source #

Memory-managed wrapper type.

class GObject o => IsListStore o Source #

Type class for types which can be safely cast to ListStore, for instance with toListStore.

Instances
(GObject a, (UnknownAncestorError ListStore a :: Constraint)) => IsListStore a Source # 
Instance details

Defined in GI.Gtk.Objects.ListStore

IsListStore ListStore Source # 
Instance details

Defined in GI.Gtk.Objects.ListStore

toListStore :: (MonadIO m, IsListStore o) => o -> m ListStore Source #

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

noListStore :: Maybe ListStore Source #

A convenience alias for Nothing :: Maybe ListStore.

Methods

append

listStoreAppend Source #

Arguments

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

listStore: A ListStore

-> m TreeIter 

Appends a new row to listStore. iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_list_store_set() or listStoreSetValue.

clear

listStoreClear Source #

Arguments

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

listStore: a ListStore.

-> m () 

Removes all rows from the list store.

insert

listStoreInsert Source #

Arguments

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

listStore: A ListStore

-> Int32

position: position to insert the new row, or -1 for last

-> m TreeIter 

Creates a new row at position. iter will be changed to point to this new row. If position is -1 or is larger than the number of rows on the list, then the new row will be appended to the list. The row will be empty after this function is called. To fill in values, you need to call gtk_list_store_set() or listStoreSetValue.

insertAfter

listStoreInsertAfter Source #

Arguments

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

listStore: A ListStore

-> Maybe TreeIter

sibling: A valid TreeIter, or Nothing

-> m TreeIter 

Inserts a new row after sibling. If sibling is Nothing, then the row will be prepended to the beginning of the list. iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_list_store_set() or listStoreSetValue.

insertBefore

listStoreInsertBefore Source #

Arguments

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

listStore: A ListStore

-> Maybe TreeIter

sibling: A valid TreeIter, or Nothing

-> m TreeIter 

Inserts a new row before sibling. If sibling is Nothing, then the row will be appended to the end of the list. iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_list_store_set() or listStoreSetValue.

insertWithValuesv

listStoreInsertWithValuesv Source #

Arguments

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

listStore: A ListStore

-> Int32

position: position to insert the new row, or -1 for last

-> [Int32]

columns: an array of column numbers

-> [GValue]

values: an array of GValues

-> m TreeIter 

A variant of gtk_list_store_insert_with_values() which takes the columns and values as two arrays, instead of varargs. This function is mainly intended for language-bindings.

Since: 2.6

iterIsValid

listStoreIterIsValid Source #

Arguments

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

listStore: A ListStore.

-> TreeIter

iter: A TreeIter.

-> m Bool

Returns: True if the iter is valid, False if the iter is invalid.

This function is slow. Only use it for debugging and\/or testing
purposes.

Checks if the given iter is a valid iter for this ListStore.

Since: 2.2

moveAfter

listStoreMoveAfter Source #

Arguments

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

store: A ListStore.

-> TreeIter

iter: A TreeIter.

-> Maybe TreeIter

position: A TreeIter or Nothing.

-> m () 

Moves iter in store to the position after position. Note that this function only works with unsorted stores. If position is Nothing, iter will be moved to the start of the list.

Since: 2.2

moveBefore

listStoreMoveBefore Source #

Arguments

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

store: A ListStore.

-> TreeIter

iter: A TreeIter.

-> Maybe TreeIter

position: A TreeIter, or Nothing.

-> m () 

Moves iter in store to the position before position. Note that this function only works with unsorted stores. If position is Nothing, iter will be moved to the end of the list.

Since: 2.2

new

listStoreNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> [GType]

types: an array of GType types for the columns, from first to last

-> m ListStore

Returns: a new ListStore

Non-vararg creation function. Used primarily by language bindings.

prepend

listStorePrepend Source #

Arguments

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

listStore: A ListStore

-> m TreeIter 

Prepends a new row to listStore. iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_list_store_set() or listStoreSetValue.

remove

listStoreRemove Source #

Arguments

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

listStore: A ListStore

-> TreeIter

iter: A valid TreeIter

-> m Bool

Returns: True if iter is valid, False if not.

Removes the given row from the list store. After being removed, iter is set to be the next valid row, or invalidated if it pointed to the last row in listStore.

reorder

listStoreReorder Source #

Arguments

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

store: A ListStore.

-> [Int32]

newOrder: an array of integers mapping the new position of each child to its old position before the re-ordering, i.e. newOrder[newpos] = oldpos. It must have exactly as many items as the list store’s length.

-> m () 

Reorders store to follow the order indicated by newOrder. Note that this function only works with unsorted stores.

Since: 2.2

set

listStoreSet Source #

Arguments

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

listStore: A ListStore

-> TreeIter

iter: A valid TreeIter for the row being modified

-> [Int32]

columns: an array of column numbers

-> [GValue]

values: an array of GValues

-> m () 

A variant of gtk_list_store_set_valist() which takes the columns and values as two arrays, instead of varargs. This function is mainly intended for language-bindings and in case the number of columns to change is not known until run-time.

Since: 2.12

setColumnTypes

listStoreSetColumnTypes Source #

Arguments

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

listStore: A ListStore

-> [GType]

types: An array length n of GTypes

-> m () 

This function is meant primarily for GObjects that inherit from ListStore, and should only be used when constructing a new ListStore. It will not function after a row has been added, or a method on the TreeModel interface is called.

setValue

listStoreSetValue Source #

Arguments

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

listStore: A ListStore

-> TreeIter

iter: A valid TreeIter for the row being modified

-> Int32

column: column number to modify

-> GValue

value: new value for the cell

-> m () 

Sets the data in the cell specified by iter and column. The type of value must be convertible to the type of the column.

swap

listStoreSwap Source #

Arguments

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

store: A ListStore.

-> TreeIter

a: A TreeIter.

-> TreeIter

b: Another TreeIter.

-> m () 

Swaps a and b in store. Note that this function only works with unsorted stores.

Since: 2.2