Portability	portable (depends on GHC)
Stability	provisional
Maintainer	gtk2hs-users@lists.sourceforge.net
Safe Haskell	None

Graphics.UI.Gtk.Gdk.Display

Contents

Detail
Class Hierarchy
Types
Methods
Signals

Description

Controls the keyboard/mouse/monitors combination.

Module available since Gdk version 2.2

Synopsis

Detail

Display objects purpose are two fold:

To grab/ungrab keyboard focus and mouse pointer
To manage and provide information about the Screen(s) available for this Display

Display objects are the GDK representation of the X Display which can be described as /a workstation consisting of a keyboard a pointing device (such as a mouse) and one or more screens/. It is used to open and keep track of various Screen objects currently instanciated by the application. It is also used to grab and release the keyboard and the mouse pointer.

Class Hierarchy

 | GObject
 | +----Display

Types

data Display Source

Instances

Eq Display
Ord Display
GObjectClass Display
DisplayClass Display

class GObjectClass o => DisplayClass o Source

Instances

DisplayClass Display

castToDisplay :: GObjectClass obj => obj -> Display Source

gTypeDisplay :: GType Source

toDisplay :: DisplayClass o => o -> Display Source

Methods

displayOpen Source

Arguments

:: String	`displayName` - the name of the display to open
-> IO (Maybe Display)	returns a `Display`, or `Nothing` if the display could not be opened.

Opens a display.

displayGetDefault Source

Arguments

:: IO (Maybe Display)

returns a Display, or Nothing if there is no default display.

Gets the default Display. This is a convenience function for displayManagerGetDefaultDisplay displayManagerGet.

displayGetName Source

Arguments

:: Display
-> IO String	returns a string representing the display name

Gets the name of the display.

displayGetNScreens Source

Arguments

:: Display
-> IO Int	returns number of screens.

Gets the number of screen managed by the display.

displayGetScreen Source

Arguments

:: Display
-> Int	`screenNum` - the screen number
-> IO Screen	returns the `Screen` object

Returns a screen object for one of the screens of the display.

displayGetDefaultScreen Source

Arguments

:: Display
-> IO Screen	returns the default `Screen` object for `display`

Get the default Screen for display.

displayPointerUngrab Source

Arguments

:: Display
-> TimeStamp	`time` - a timestap (e.g. `currentTime`).
-> IO ()

Release any pointer grab.

displayKeyboardUngrab Source

Arguments

:: Display
-> TimeStamp	`time` - a timestap (e.g `currentTime`).
-> IO ()

Release any keyboard grab

displayPointerIsGrabbed Source

Arguments

:: Display
-> IO Bool	returns `True` if an active X pointer grab is in effect

Test if the pointer is grabbed.

displayBeep :: Display -> IO ()Source

Emits a short beep on display

displaySync :: Display -> IO ()Source

Flushes any requests queued for the windowing system and waits until all requests have been handled. This is often used for making sure that the display is synchronized with the current state of the program. Calling displaySync before errorTrapPop makes sure that any errors generated from earlier requests are handled before the error trap is removed.

This is most useful for X11. On windowing systems where requests are handled synchronously, this function will do nothing.

displayFlush :: Display -> IO ()Source

Flushes any requests queued for the windowing system; this happens automatically when the main loop blocks waiting for new events, but if your application is drawing without returning control to the main loop, you may need to call this function explicitely. A common case where this function needs to be called is when an application is executing drawing commands from a thread other than the thread where the main loop is running.

This is most useful for X11. On windowing systems where requests are handled synchronously, this function will do nothing.

Available since Gdk version 2.4

displayClose :: Display -> IO ()Source

Closes the connection to the windowing system for the given display, and cleans up associated resources.

displayListDevices Source

Arguments

:: Display
-> IO [Device]	returns a list of `Device`

Returns the list of available input devices attached to display.

displaySetDoubleClickTime Source

Arguments

:: Display
-> Int	`msec` - double click time in milliseconds (thousandths of a second)
-> IO ()

Sets the double click time (two clicks within this time interval count as a double click and result in an eventButton where eventClick is DoubleClick). Applications should not set this, it is a global user-configured setting.

displaySetDoubleClickDistance Source

Arguments

:: Display
-> Int	`distance` - distance in pixels
-> IO ()

Sets the double click distance (two clicks within this distance count as a double click and result in an eventButton where eventClick is DoubleClick). See also displaySetDoubleClickTime. Applications should not set this, it is a global user-configured setting.

Available since Gdk version 2.4

displayGetPointer Source

Arguments

:: Display
-> IO (Screen, [Modifier], Int, Int)	`(s, m, x, y)` - the screen `s`, the modifier mask `m` and the `x` and `y` coordinates of the pointer

Gets the current location of the pointer and the current modifier mask for a given display.

displayGetWindowAtPointer Source

Arguments

:: Display
-> IO (Maybe (DrawWindow, Int, Int))	`(screen, winX, winY)` returns the window under the mouse pointer, or `Nothing`. The `winX` and `winY` denote the pointer location relative to the window origin

Obtains the window underneath the mouse pointer, returning the location of the pointer in that window in winX, winY for screen. Returns Nothing if the window under the mouse pointer is not known to GDK (for example, belongs to another application).

displayWarpPointer Source

Arguments

:: Display
-> Screen	`screen` - the screen of `display` to warp the pointer to
-> Int	`x` - the x coordinate of the destination
-> Int	`y` - the y coordinate of the destination
-> IO ()

Moves the pointer of display to the point x,y on the screen screen, unless the pointer is confined to a window by a grab, in which case it will be moved as far as allowed by the grab. Warping the pointer creates events as if the user had moved the mouse instantaneously to the destination.

Note that the pointer should normally be under the control of the user. This function was added to cover some rare use cases like keyboard navigation support for the color picker in the ColorSelectionDialog.

Available since Gdk version 2.8

displaySupportsCursorColor Source

Arguments

:: Display
-> IO Bool	returns whether cursors can have multiple colors.

Returns True if multicolored cursors are supported on display. Otherwise, cursors have only a forground and a background color.

Available since Gdk version 2.4

displaySupportsCursorAlpha Source

Arguments

:: Display
-> IO Bool	returns whether cursors can have alpha channels.

Returns True if cursors can use an 8bit alpha channel on display. Otherwise, cursors are restricted to bilevel alpha (i.e. a mask).

Available since Gdk version 2.4

displayGetDefaultCursorSize Source

Arguments

:: Display
-> IO Int	returns the default cursor size.

Returns the default size to use for cursors on display.

Available since Gdk version 2.4

displayGetMaximalCursorSize Source

Arguments

:: Display
-> IO (Int, Int)	`(width, height)` maximal `width` and `height` of the cursor

Gets the maximal size to use for cursors on display.

Available since Gdk version 2.4

displayGetDefaultGroup Source

Arguments

:: Display
-> IO DrawWindow	returns The default group leader window for `display`

Returns the default group leader window for all toplevel windows on display. This window is implicitly created by GDK. See windowSetGroup.

Available since Gdk version 2.4

displaySupportsSelectionNotification Source

Arguments

:: Display
-> IO Bool	returns whether `EOwnerChange` events will be sent.

Returns whether EOwnerChange events will be sent when the owner of a selection changes.

Available since Gdk version 2.6

displayRequestSelectionNotification Source

Arguments

:: Display
-> SelectionTag	`selection` - the `Atom` naming the selection for which ownership change notification is requested
-> IO Bool	returns whether `EOwnerChange` events will be sent.

Request EOwnerChange events for ownership changes of the selection named by the given atom.

Available since Gdk version 2.6

displaySupportsClipboardPersistence Source

Arguments

:: Display
-> IO Bool	returns `True` if the display supports clipboard persistance.

Returns whether the speicifed display supports clipboard persistance; i.e. if it's possible to store the clipboard data after an application has quit. On X11 this checks if a clipboard daemon is running.

Available since Gdk version 2.6

displayStoreClipboard Source

Arguments

:: Display
-> DrawWindow	`clipboardWindow` - a `DrawWindow` belonging to the clipboard owner
-> Word32	`time` - a timestamp
-> Maybe [TargetTag]	`targets` - an array of targets that should be saved, or `Nothing` if all available targets should be saved.
-> IO ()

Issues a request to the clipboard manager to store the clipboard data. On X11, this is a special program that works according to the freedesktop clipboard specification, available at http://www.freedesktop.org/Standards/clipboard-manager-spec.

Available since Gdk version 2.6

displaySupportsShapes Source

Arguments

:: Display
-> IO Bool	returns `True` if shaped windows are supported

Returns True if windowShapeCombineMask can be used to create shaped windows on display.

Available since Gdk version 2.10

displaySupportsInputShapes Source

Arguments

:: Display
-> IO Bool	returns `True` if windows with modified input shape are supported

Returns True if windowInputShapeCombineMask can be used to modify the input shape of windows on display.

Available since Gdk version 2.10

displaySupportsComposite Source

Arguments

:: Display
-> IO Bool	returns `True` if windows may be composited.

Returns True if windowSetComposited can be used to redirect drawing on the window using compositing.

Currently this only works on X11 with XComposite and XDamage extensions available.

Available since Gdk version 2.12

Signals

displayClosed :: DisplayClass self => Signal self (Bool -> IO ())Source

The displayClosed signal is emitted when the connection to the windowing system for display is closed.