Graphics.UI.Gtk.Gdk.Events

gtk-0.12.4: Binding to the Gtk+ graphical user interface library.

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

Graphics.UI.Gtk.Gdk.Events

Description

Definiton of a record that contains event information. Deprecated in favor of `EventM` and not exported by Gtk.hs.

Synopsis

- data Modifier
  - = Shift
  - | Lock
  - | Control
  - | Alt
  - | Alt2
  - | Alt3
  - | Alt4
  - | Alt5
  - | Button1
  - | Button2
  - | Button3
  - | Button4
  - | Button5
  - | Super
  - | Hyper
  - | Meta
  - | Release
  - | ModifierMask
- type TimeStamp = Word32
- currentTime :: TimeStamp
- data Event
  - = Event {
    - eventSent :: Bool
    }
  - | Expose {
    - eventSent :: Bool
    - eventArea :: Rectangle
    - eventRegion :: Region
    - eventCount :: Int
    }
  - | Motion {
    - eventSent :: Bool
    - eventTime :: TimeStamp
    - eventX :: Double
    - eventY :: Double
    - eventModifier :: [Modifier]
    - eventIsHint :: Bool
    - eventXRoot :: Double
    - eventYRoot :: Double
    }
  - | Button {
    - eventSent :: Bool
    - eventClick :: Click
    - eventTime :: TimeStamp
    - eventX :: Double
    - eventY :: Double
    - eventModifier :: [Modifier]
    - eventButton :: MouseButton
    - eventXRoot :: Double
    - eventYRoot :: Double
    }
  - | Key {
    - eventRelease :: Bool
    - eventSent :: Bool
    - eventTime :: TimeStamp
    - eventModifier :: [Modifier]
    - eventWithCapsLock :: Bool
    - eventWithNumLock :: Bool
    - eventWithScrollLock :: Bool
    - eventKeyVal :: KeyVal
    - eventKeyName :: String
    - eventKeyChar :: Maybe Char
    }
  - | Crossing {
    - eventSent :: Bool
    - eventTime :: TimeStamp
    - eventX :: Double
    - eventY :: Double
    - eventXRoot :: Double
    - eventYRoot :: Double
    - eventLeaves :: Bool
    - eventCrossingMode :: CrossingMode
    - eventNotifyType :: NotifyType
    - eventModifier :: [Modifier]
    }
  - | Focus {
    - eventSent :: Bool
    - eventInFocus :: Bool
    }
  - | Configure {
    - eventSent :: Bool
    - eventXParent :: Int
    - eventYParent :: Int
    - eventWidth :: Int
    - eventHeight :: Int
    }
  - | Visibility {
    - eventSent :: Bool
    - eventVisible :: VisibilityState
    }
  - | Scroll {
    - eventSent :: Bool
    - eventTime :: TimeStamp
    - eventX :: Double
    - eventY :: Double
    - eventDirection :: ScrollDirection
    - eventXRoot :: Double
    - eventYRoot :: Double
    }
  - | WindowState {
    - eventSent :: Bool
    - eventWindowMask :: [WindowState]
    - eventWindowState :: [WindowState]
    }
  - | Proximity {
    - eventSent :: Bool
    - eventTime :: TimeStamp
    - eventInContact :: Bool
    }
- type EventButton = Event
- type EventScroll = Event
- type EventMotion = Event
- type EventExpose = Event
- type EventKey = Event
- type EventConfigure = Event
- type EventCrossing = Event
- type EventFocus = Event
- type EventProperty = Event
- type EventProximity = Event
- type EventVisibility = Event
- type EventWindowState = Event
- type EventGrabBroken = Event
- marshExposeRect :: Ptr Event -> IO Rectangle
- marshalEvent :: Ptr Event -> IO Event
- data VisibilityState
  - = VisibilityUnobscured
  - | VisibilityPartialObscured
  - | VisibilityFullyObscured
- data CrossingMode
  - = CrossingNormal
  - | CrossingGrab
  - | CrossingUngrab
  - | CrossingGtkGrab
  - | CrossingGtkUngrab
  - | CrossingStateChanged
- data NotifyType
  - = NotifyAncestor
  - | NotifyVirtual
  - | NotifyInferior
  - | NotifyNonlinear
  - | NotifyNonlinearVirtual
  - | NotifyUnknown
- data WindowState
  - = WindowStateWithdrawn
  - | WindowStateIconified
  - | WindowStateMaximized
  - | WindowStateSticky
  - | WindowStateFullscreen
  - | WindowStateAbove
  - | WindowStateBelow
- data ScrollDirection
  - = ScrollUp
  - | ScrollDown
  - | ScrollLeft
  - | ScrollRight
- data MouseButton
  - = LeftButton
  - | MiddleButton
  - | RightButton
  - | OtherButton Int
- data Click
  - = SingleClick
  - | DoubleClick
  - | TripleClick
  - | ReleaseClick
- data Rectangle = Rectangle Int Int Int Int

# Documentation

data Modifier

Keyboard modifiers that are depressed when the user presses a key or a mouse button.

- This data type is used to build lists of modifers that were active during an event.
- The Apple key on Macintoshs is mapped to `Alt2` and the `Meta` key (if available).
- Since Gtk 2.10, there are also `Super`, `Hyper` and `Meta` modifiers which are simply generated from `Alt` .. `Compose` modifier keys, depending on the mapping used by the windowing system. Due to one key being mapped to e.g. `Alt2` and `Meta`, you shouldn't pattern match directly against a certain key but check whether a key is in the list using the `elem` function, say.

Constructors

Shift |
Lock |
Control |
Alt |
Alt2 |
Alt3 |
Alt4 |
Alt5 |
Button1 |
Button2 |
Button3 |
Button4 |
Button5 |
Super |
Hyper |
Meta |
Release |
ModifierMask |

Instances

Bounded Modifier |
Enum Modifier |
Eq Modifier |
Show Modifier |
Flags Modifier |

type TimeStamp = Word32

The time (in milliseconds) when an event happened. This is used mostly for ordering events and responses to events.

currentTime :: TimeStamp

Represents the current time, and can be used anywhere a time is expected.

Deprecated way of conveying event information.

data Event

Events that are delivered to a widget.

- Any given signal only emits one of these variants as described in `Widget`. Many events share common attributes:
- The `eventSent` attribute is `True` if the event was not created by the user but by another application.
- The `eventTime` attribute contains a time in milliseconds when the event happened.
- The `eventX` and `eventY` attributes contain the coordinates relative to the `DrawWindow` associated with this widget. The values can contain sub-pixel information if the input device is a graphics tablet or the like.
- The `eventModifier` attribute denotes what modifier key was pressed during the event.

Constructors

Event | An event that is not in one of the more specific categories below. This includes delete, destroy, map and unmap events. These events have no extra information associated with them.
Fields eventSent :: Bool
Expose | The expose event. A region of widget that receives this event needs to be redrawn. This event is the result of revealing part or all of a window or by the application calling functions like `widgetQueueDrawArea`.
Fields eventSent :: Bool eventArea :: Rectangle A bounding box denoting what needs to be updated. For a more detailed information on the area that needs redrawing, use the next field. eventRegion :: Region A set of horizontal stripes that denote the invalid area. eventCount :: Int The number of contiguous `Expose` events following this one. The only use for this is "exposure compression", i.e. handling all contiguous `Expose` events in one go, though Gdk performs some exposure compression so this is not normally needed.
Motion | Mouse motion. Captures the movement of the mouse cursor while it is within the area of the widget.
Fields eventSent :: Bool eventTime :: TimeStamp The time of the event in milliseconds. eventX :: Double eventY :: Double eventModifier :: [Modifier] eventIsHint :: Bool Indicate if this event is only a hint of the motion. If the `PointerMotionHintMask` is set with `widgetAddEvents` then mouse positions are only generated each time `drawWindowGetPointer` is called. In this case `eventIsHint` is set to `True`. eventXRoot :: Double The coordinates of the click relative to the screen origin. eventYRoot :: Double The coordinates of the click relative to the screen origin.
Button | A mouse button was pressed or released. This event is triggered if the mouse button was pressed or released while the mouse cursor was within the region of the widget.
Fields eventSent :: Bool eventClick :: Click The kind of button press, see `Click`. Note that double clicks will trigger this event with `eventClick` set to `SingleClick`, `ReleaseClick`, `SingleClick`, `DoubleClick`, `ReleaseClick`. Triple clicks will produce this sequence followed by `SingleClick`, `DoubleClick`, `TripleClick`, `ReleaseClick`. eventTime :: TimeStamp The time of the event in milliseconds. eventX :: Double eventY :: Double eventModifier :: [Modifier] eventButton :: MouseButton The button that was pressed. eventXRoot :: Double The coordinates of the click relative to the screen origin. eventYRoot :: Double The coordinates of the click relative to the screen origin.
Key | A key was pressed while the widget had the input focus. If the widget has the current input focus (see `widgetSetCanFocus`) it will receive key pressed events. Certain key combinations are of no interest to a normal widget like Alt-F to access the file menu. For all these keys, the handler must return `False` to indicate that the key stroke should be propagated to the parent widget. At the top-level widget, keyboard shortcuts like Alt-F are turned into the corresponding signals.
Fields eventRelease :: Bool This flag is set if the key was released. This flag makes it possible to connect the same handler to `onKeyPress` and `onKeyRelease`. eventSent :: Bool eventTime :: TimeStamp The time of the event in milliseconds. eventModifier :: [Modifier] eventWithCapsLock :: Bool This flag is `True` if Caps Lock is on while this key was pressed. eventWithNumLock :: Bool This flag is `True` if Number Lock is on while this key was pressed. eventWithScrollLock :: Bool This flag is `True` if Scroll Lock is on while this key was pressed. eventKeyVal :: KeyVal A number representing the key that was pressed or released. A more convenient interface is provided by the next two fields. eventKeyName :: String A string representing the key that was pressed or released. This string contains a description of the key rather than what should appear on screen. For example, pressing 1 on the keypad results in KP_1. Of particular interest are F1 till F12, for a complete list refer to "gdk/gdkkeysyms.h" where all possible values are defined. The corresponding strings are the constants without the GDK_ prefix. eventKeyChar :: Maybe Char A character matching the key that was pressed. This entry can be used to build up a whole input string. The character is `Nothing` if the key does not correspond to a simple unicode character.
Crossing | Mouse cursor crossing event. This event indicates that the mouse cursor is hovering over this widget. It is used to set a widget into the pre-focus state where some GUI elements like buttons on a toolbar change their appearance.
Fields eventSent :: Bool eventTime :: TimeStamp The time of the event in milliseconds. eventX :: Double eventY :: Double eventXRoot :: Double The coordinates of the click relative to the screen origin. eventYRoot :: Double The coordinates of the click relative to the screen origin. eventLeaves :: Bool This flag is false if the widget was entered, it is true when the widget the mouse cursor left the widget. eventCrossingMode :: CrossingMode Kind of enter/leave event. The mouse cursor might enter this widget because it grabs the mouse cursor for e.g. a modal dialog box. eventNotifyType :: NotifyType Information on from what level of the widget hierarchy the mouse cursor came. See `NotifyType`. eventModifier :: [Modifier]
Focus | Gaining or loosing input focus.
Fields eventSent :: Bool eventInFocus :: Bool This flag is `True` if the widget receives the focus and `False` if it just lost the input focus.
Configure | The widget's size has changed. In response to this event the application can allocate resources that are specific to the size of the widget. It is emitted when the widget is shown the first time and on every resize.
Fields eventSent :: Bool eventXParent :: Int Position within the parent window. eventYParent :: Int Position within the parent window. eventWidth :: Int eventHeight :: Int
Visibility | Change of visibility of a widget.
Fields eventSent :: Bool eventVisible :: VisibilityState Denote what portions of the widget is visible.
Scroll | Wheel movement of the mouse. This action denotes that the content of the widget should be scrolled. The event is triggered by the movement of the mouse wheel. Surrounding scroll bars are independant of this signal. Most mice do not have buttons for horizontal scrolling, hence `eventDirection` will usually not contain `ScrollLeft` and `ScrollRight`. Mice with additional buttons may not work on X since only five buttons are supported (the three main buttons and two for the wheel). The handler of this signal should update the scroll bars that surround this widget which in turn tell this widget to update.
Fields eventSent :: Bool eventTime :: TimeStamp The time of the event in milliseconds. eventX :: Double eventY :: Double eventDirection :: ScrollDirection eventXRoot :: Double The coordinates of the click relative to the screen origin. eventYRoot :: Double The coordinates of the click relative to the screen origin.
WindowState | Indicate how the appearance of this window has changed.
Fields eventSent :: Bool eventWindowMask :: [WindowState] The mask indicates which flags have changed. eventWindowState :: [WindowState] The state indicates the current state of the window.
Proximity | The state of the pen of a graphics tablet pen or touchscreen device.
Fields eventSent :: Bool eventTime :: TimeStamp The time of the event in milliseconds. eventInContact :: Bool Whether the stylus has moved in or out of contact with the tablet.

Instances

Show Event |

type EventButton = Event

An event that contains information on a button press.

type EventScroll = Event

An event that contains information on scrolling.

type EventMotion = Event

An event that contains information on the movement of the mouse pointer.

type EventExpose = Event

An area of the `DrawWindow` needs redrawing.

type EventKey = Event

An event that contains information about a key press.

type EventConfigure = Event

An event that contains the new size of a window.

type EventCrossing = Event

Generated when the pointer enters or leaves a window.

type EventFocus = Event

An event that informs about a change of the input focus.

type EventProperty = Event

An event that indicates a property of the window changed.

type EventProximity = Event

An event that indicates that the pen of a graphics table is touching or not touching the tablet.

type EventVisibility = Event

Parts of the window have been exposed or obscured.

type EventWindowState = Event

The window state has changed.

type EventGrabBroken = Event

A grab has been broken by unusual means.

marshExposeRect :: Ptr Event -> IO Rectangle

marshalEvent :: Ptr Event -> IO Event

data VisibilityState

Constructors

VisibilityUnobscured |
VisibilityPartialObscured |
VisibilityFullyObscured |

Instances

Enum VisibilityState |
Eq VisibilityState |
Show VisibilityState |

data CrossingMode

How focus is crossing the widget.

Constructors

CrossingNormal |
CrossingGrab |
CrossingUngrab |
CrossingGtkGrab |
CrossingGtkUngrab |
CrossingStateChanged |

Instances

Enum CrossingMode |
Eq CrossingMode |
Show CrossingMode |

data NotifyType

Information on from what level of the widget hierarchy the mouse cursor came.

`NotifyAncestor`
  The window is entered from an ancestor or left towards an ancestor.
`NotifyVirtual`
  The pointer moves between an ancestor and an inferior of the window.
`NotifyInferior`
  The window is entered from an inferior or left towards an inferior.
`NotifyNonlinear`
  The window is entered from or left towards a window which is neither an ancestor nor an inferior.
`NotifyNonlinearVirtual`
  The pointer moves between two windows which are not ancestors of each other and the window is part of the ancestor chain between one of these windows and their least common ancestor.
`NotifyUnknown`
  The level change does not fit into any of the other categories or could not be determined.

Constructors

NotifyAncestor |
NotifyVirtual |
NotifyInferior |
NotifyNonlinear |
NotifyNonlinearVirtual |
NotifyUnknown |

Instances

Enum NotifyType | Determine if child widget may be overdrawn.
Eq NotifyType |
Show NotifyType |

data WindowState

The state a `DrawWindow` is in.

Constructors

WindowStateWithdrawn |
WindowStateIconified |
WindowStateMaximized |
WindowStateSticky |
WindowStateFullscreen |
WindowStateAbove |
WindowStateBelow |

Instances

Bounded WindowState |
Enum WindowState | These are hints for the window manager that indicate what type of function the window has. The window manager can use this when determining decoration and behaviour of the window. The hint must be set before mapping the window. See the extended window manager hints specification for more details about window types.
Eq WindowState |
Show WindowState |
Flags WindowState |

data ScrollDirection

in which direction was scrolled?

Constructors

ScrollUp |
ScrollDown |
ScrollLeft |
ScrollRight |

Instances

Enum ScrollDirection |
Eq ScrollDirection |
Show ScrollDirection |

data MouseButton

Constructors

LeftButton |
MiddleButton |
RightButton |
OtherButton Int |

Instances

Enum MouseButton |
Eq MouseButton |
Show MouseButton |

data Click

Type of mouse click

Constructors

SingleClick |
DoubleClick |
TripleClick |
ReleaseClick |

Instances

Enum Click |
Eq Click |
Show Click |

data Rectangle

Rectangle

- Specifies x, y, width and height

Constructors

Rectangle Int Int Int Int |

Instances

Eq Rectangle |
Show Rectangle |
Storable Rectangle |