gtk-0.12.2: Binding to the Gtk+ graphical user interface library.

Portability | portable (depends on GHC)
Stability | provisional
Maintainer | gtk2hs-users@lists.sourceforge.net

Graphics.UI.Gtk.General.Selection

Contents

- Types
- Constants
- Constructors
- Methods
- Signals

Description

Functions for handling inter-process communication via selections.

Synopsis

- type InfoId = CUInt
- data Atom
- type TargetTag = Atom
- type SelectionTag = Atom
- type SelectionTypeTag = Atom
- data TargetList
- type SelectionDataM a = ReaderT (Ptr ()) IO a
- data TargetFlags
  - = TargetSameApp
  - | TargetSameWidget
  - | TargetOtherApp
  - | TargetOtherWidget
- targetString :: TargetTag
- selectionTypeAtom :: SelectionTypeTag
- selectionTypeInteger :: SelectionTypeTag
- selectionTypeString :: SelectionTypeTag
- atomNew :: String -> IO Atom
- targetListNew :: IO TargetList
- targetListAdd :: TargetList -> TargetTag -> [TargetFlags] -> InfoId -> IO ()
- targetListAddTextTargets :: TargetList -> InfoId -> IO ()
- targetListAddImageTargets :: TargetList -> InfoId -> Bool -> IO ()
- targetListAddUriTargets :: TargetList -> InfoId -> IO ()
- targetListAddRichTextTargets :: TextBufferClass tb => TargetList -> InfoId -> Bool -> tb -> IO ()
- targetListRemove :: TargetList -> TargetTag -> IO ()
- selectionAddTarget :: WidgetClass widget => widget -> SelectionTag -> TargetTag -> InfoId -> IO ()
- selectionClearTargets :: WidgetClass widget => widget -> SelectionTag -> IO ()
- selectionOwnerSet :: WidgetClass widget => Maybe widget -> SelectionTag -> TimeStamp -> IO Bool
- selectionOwnerSetForDisplay :: WidgetClass widget => Display -> Maybe widget -> SelectionTag -> TimeStamp -> IO Bool
- selectionRemoveAll :: WidgetClass widget => widget -> IO ()
- selectionDataSet :: (Integral a, Storable a) => SelectionTypeTag -> [a] -> SelectionDataM ()
- selectionDataGet :: (Integral a, Storable a) => SelectionTypeTag -> SelectionDataM (Maybe [a])
- selectionDataIsValid :: SelectionDataM Bool
- selectionDataSetText :: String -> SelectionDataM Bool
- selectionDataGetText :: SelectionDataM (Maybe String)
- selectionDataSetPixbuf :: Pixbuf -> SelectionDataM Bool
- selectionDataGetPixbuf :: SelectionDataM (Maybe Pixbuf)
- selectionDataSetURIs :: [String] -> SelectionDataM Bool
- selectionDataGetURIs :: SelectionDataM (Maybe [String])
- selectionDataTargetsIncludeImage :: Bool -> SelectionDataM Bool
- selectionDataGetTarget :: SelectionDataM TargetTag
- selectionDataSetTarget :: TargetTag -> SelectionDataM ()
- selectionDataGetTargets :: SelectionDataM [TargetTag]
- selectionDataTargetsIncludeText :: SelectionDataM Bool
- selectionDataTargetsIncludeUri :: SelectionDataM Bool
- selectionDataTargetsIncludeRichText :: TextBufferClass tb => tb -> SelectionDataM Bool
- selectionGet :: WidgetClass self => Signal self (InfoId -> TimeStamp -> SelectionDataM ())
- selectionReceived :: WidgetClass self => Signal self (TimeStamp -> SelectionDataM ())

# Types

type InfoId = CUInt

A number that the application can use to differentiate between different data types or application states.

data Atom

An atom is an index into a global string table. It is possible to associate binary data with each entry. This facility is used for inter-application data exchange such as properties of `Graphics.UI.Gtk.Gdk.DrawWindow.DrawWindow` (using `PropertyTag`), `Graphics.UI.Gtk.Clipboard.Clipboard` or `Graphics.UI.Gtk.General.Drag` (`SelectionId` and `TargetId`).

Instances

Eq Atom |
Show Atom |

type TargetTag = Atom

A tag that uniquely identifies a target. A target describes the format of the underlying data source, for instance, it might be a string. A single selection may support multiple targets: suppose a new target is created for the Haskell data type `Double`. In this case, the value of the floating point number could also be offered as a string.

type SelectionTag = Atom

A tag that uniquely identifies a selection. A selection denotes the exchange mechanism that is being used, for instance, the clipboard is the most common exchange mechanism. For drag and drop applications, a new selection tag is usually created for each different kind of data that is being exchanged.

type SelectionTypeTag = Atom

A tag that defines the encoding of the binary data. For instance, a string might be encoded as UTF-8 or in a different locale. Each encoding would use the same `TargetTag` but a different `SelectionTypeTag`.

data TargetList

A `TargetList` contains information about all possible formats (represented as `TargetTag`) that a widget can create or receive in form of a selection.

type SelectionDataM a = ReaderT (Ptr ()) IO a

A monad providing access to selection data.

data TargetFlags

The `TargetFlags` enumeration is used to specify constraints on an entry in a `Graphics.UI.Gtk.Gdk.Selection.TargetList`. These flags are only used for drag and drop.

- If the `TargetSameApp` flag is set, the target will only be selected for drags within a single application.
- If the `TargetSameWidget` flag is set, the target will only be selected for drags within a single widget.

Constructors

TargetSameApp |
TargetSameWidget |
TargetOtherApp |
TargetOtherWidget |

Instances

Bounded TargetFlags |
Enum TargetFlags | Is the text written from left to right or the exotic way?
Eq TargetFlags |
Show TargetFlags |
Flags TargetFlags |

# Constants

targetString :: TargetTag

If this target is provided by a selection, then the data is a string.

selectionTypeAtom :: SelectionTypeTag

The type indicating that the associated data is itself a (list of) `Graphics.UI.Gtk.General.Selection.Atom`s.

selectionTypeInteger :: SelectionTypeTag

The type indicating that the associated data consists of integers.

selectionTypeString :: SelectionTypeTag

The type indicating that the associated data is a string without further information on its encoding.

# Constructors

atomNew :: String -> IO Atom

Create a new `TargetTag`, `SelectionTag`, `SelectionTypeTag` or `PropertyTag`. Note that creating two target tags with the same name will create the same tag, in particular, the tag will be the same across different applications. Note that the name of an `Atom` can be printed by `show` though comparing the atom is merely an integer comparison.

targetListNew :: IO TargetList

Create a new, empty `TargetList`.

# Methods

targetListAdd :: TargetList -> TargetTag -> [TargetFlags] -> InfoId -> IO ()

Append another target to the given `TargetList`.

- Note that the `TargetFlags` are only used for drag and drop, not in normal selection handling.

targetListAddTextTargets :: TargetList -> InfoId -> IO ()

Append all text targets supported by the selection mechanism to the target list. All targets are added with the same `InfoId`.

- Since Gtk 2.6.

targetListAddImageTargets :: TargetList -> InfoId -> Bool -> IO ()

Append all image targets supported by the selection mechanism to the target list. All targets are added with the same `InfoId`. If the boolean flag is set, only targets will be added which Gtk+ knows how to convert into a `Graphics.UI.Gtk.Pixbuf.Pixbuf`.

- Since Gtk 2.6.

targetListAddUriTargets :: TargetList -> InfoId -> IO ()

Append all URI (universal resource indicator, fomerly URL) targets supported by the selection mechanism to the target list. All targets are added with the same `InfoId`.

- Since Gtk 2.6.

targetListAddRichTextTargets :: TextBufferClass tb => TargetList -> InfoId -> Bool -> tb -> IO ()

Append all rich text targets registered with `Graphics.UI.Gtk.TextBuffer.textBufferRegisterSerializeFormat` to the target list. All targets are added with the same `InfoId`. If the boolean flag is `True` then deserializable rich text formats will be added, serializable formats otherwise.

- Since Gtk 2.10.

targetListRemove :: TargetList -> TargetTag -> IO ()

Remove a target from a target list.

selectionAddTarget :: WidgetClass widget => widget -> SelectionTag -> TargetTag -> InfoId -> IO ()

Appends a specified target to the list of supported targets for a given widget and selection.

selectionClearTargets :: WidgetClass widget => widget -> SelectionTag -> IO ()

Remove all targets registered for the given selection for the widget.

selectionOwnerSet :: WidgetClass widget => Maybe widget -> SelectionTag -> TimeStamp -> IO Bool

Claims ownership of a given selection for a particular widget, or, if widget is `Nothing`, release ownership of the selection.

selectionOwnerSetForDisplay :: WidgetClass widget => Display -> Maybe widget -> SelectionTag -> TimeStamp -> IO Bool

Set the ownership of a given selection and display.

selectionRemoveAll :: WidgetClass widget => widget -> IO ()

Removes all handlers and unsets ownership of all selections for a widget. Called when widget is being destroyed. This function will not generally be called by applications.

selectionDataSet :: (Integral a, Storable a) => SelectionTypeTag -> [a] -> SelectionDataM ()

Stores new data in the `SelectionDataM` monad. The stored data may only be an array of integer types that are no larger than 32 bits.

selectionDataGet :: (Integral a, Storable a) => SelectionTypeTag -> SelectionDataM (Maybe [a])

Retreives the data in the `SelectionDataM` monad. The returned array must have elements of the size that were used to set this data. If the size or the type tag does not match, `Nothing` is returned.

selectionDataIsValid :: SelectionDataM Bool

Check if the currently stored data is valid.

- If this function returns `False`, no data is set in this selection and `selectionDataGet` will return `Nothing` no matter what type is requested.

selectionDataSetText :: String -> SelectionDataM Bool

Sets the contents of the selection from a string. The string is converted to the form determined by the allowed targets of the selection.

- Returns `True` if setting the text was successful.

selectionDataGetText :: SelectionDataM (Maybe String)

Gets the contents of the selection data as a string.

selectionDataSetPixbuf :: Pixbuf -> SelectionDataM Bool

Sets the contents of the selection from a `Pixbuf`. The pixbuf is converted to the form determined by the allowed targets of the selection.

- Returns `True` if setting the `Pixbuf` was successful. Since Gtk 2.6.

selectionDataGetPixbuf :: SelectionDataM (Maybe Pixbuf)

Gets the contents of the selection data as a `Pixbuf`.

- Since Gtk 2.6.

selectionDataSetURIs :: [String] -> SelectionDataM Bool

Sets the contents of the selection from a list of URIs. The string is converted to the form determined by the possible targets of the selection.

- Returns `True` if setting the URIs was successful. Since Gtk 2.6.

selectionDataGetURIs :: SelectionDataM (Maybe [String])

Gets the contents of the selection data as list of URIs. Returns `Nothing` if the selection did not contain any URIs.

- Since Gtk 2.6.

selectionDataTargetsIncludeImage

Arguments

:: Bool | whether to accept only targets for which GTK+ knows how to convert a pixbuf into the format
-> SelectionDataM Bool |

Given a `SelectionDataM` holding a list of targets, determines if any of the targets in targets can be used to provide a `Pixbuf`.

- Since Gtk 2.6

selectionDataGetTarget :: SelectionDataM TargetTag

Retrieve the currently set `TargetTag` in the selection.

selectionDataSetTarget :: TargetTag -> SelectionDataM ()

Set the selection to the given `TargetTag`.

selectionDataGetTargets :: SelectionDataM [TargetTag]

Queries the content type of the selection data as a list of targets. Whenever the application is asked whether certain targets are acceptable, it is handed a selection that contains a list of `TargetTag`s as payload. A similar result could be achieved using 'selectionDataGet selectionTypeAtom'.

selectionDataTargetsIncludeText :: SelectionDataM Bool

Given a `SelectionDataM` holding a list of targets, determines if any of the targets in targets can be used to provide text.

selectionDataTargetsIncludeUri :: SelectionDataM Bool

Given a `SelectionDataM` holding a list of targets, determines if any of the targets in targets can be used to provide URIs.

- Since Gtk 2.10

selectionDataTargetsIncludeRichText :: TextBufferClass tb => tb -> SelectionDataM Bool

Given a `SelectionDataM` holding a list of targets, check if, well, dunno really. FIXME: what does the `TextBuffer` do?

- Since Gtk 2.10

# Signals

selectionGet :: WidgetClass self => Signal self (InfoId -> TimeStamp -> SelectionDataM ())

Emitted in order to ask the application for selection data. Within the handler the function `selectionDataSet` or one of its derivatives should be called.

selectionReceived :: WidgetClass self => Signal self (TimeStamp -> SelectionDataM ())

Pass the supplied selection data to the application. The application is expected to read the data using `selectionDataGet` or one of its derivatives.