| Maintainer | gtk2hs-users@lists.sourceforge.net |
|---|---|
| Stability | provisional |
| Portability | portable (depends on GHC) |
| Safe Haskell | None |
| Language | Haskell98 |
Graphics.UI.Gtk.ModelView.TreeDrag
Description
Interfaces for drag-and-drop support in TreeView.
- treeModelEqual :: (TreeModelClass tm1, TreeModelClass tm2) => tm1 -> tm2 -> Bool
- targetTreeModelRow :: TargetTag
- treeGetRowDragData :: SelectionDataM (Maybe (TreeModel, TreePath))
- treeSetRowDragData :: TreeModelClass treeModel => treeModel -> TreePath -> SelectionDataM Bool
Detail
TreeViews provide special support for
Drag-and-Drop such as hover-to-open-rows or autoscrolling. This module
implements two utility functions that set and get a path and a model in a
Selection structure. These functions
are thus useful to implement drag-and-drop functionality in a
TreeModel. In fact, they are used as part of
the default drag-and-drop interfaces of
ListStore and
TreeStore that allows to permute rows and move
them between hierarchy levels.
DND information for exchanging a model and a path.
treeModelEqual :: (TreeModelClass tm1, TreeModelClass tm2) => tm1 -> tm2 -> Bool Source
targetTreeModelRow :: TargetTag Source
The SelectionTag, TargetTag and SelectionTypeTag of the DND
mechanism of ListStore and
TreeStore. This tag is used by
treeGetRowDragData and treeSetRowDragData to store a store and a
TreePath in a SelectionDataM. This target should be added to a
TargetList using
TargetSameWidget flag and an
InfoId of 0.
treeGetRowDragData :: SelectionDataM (Maybe (TreeModel, TreePath)) Source
Obtains a TreeModel and a path from SelectionDataM whenever the target is
targetTreeModelRow. Normally called from a treeDragDestDragDataReceived handler.
treeSetRowDragData :: TreeModelClass treeModel => treeModel -> TreePath -> SelectionDataM Bool Source
Sets selection data with the target targetTreeModelRow, consisting
of a TreeModel and a TreePath. Normally used in a
treeDragSourceDragDataGet handler.
- Returns
Trueif setting the data was successful.