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.Abstract.Range

Contents

- Description
- Class Hierarchy
- Types
- Methods
- Attributes
- Signals
- Deprecated

Description

Base class for widgets which visualize an adjustment

Synopsis

- data Range
- class WidgetClass o => RangeClass o
- castToRange :: GObjectClass obj => obj -> Range
- gTypeRange :: GType
- toRange :: RangeClass o => o -> Range
- rangeGetAdjustment :: RangeClass self => self -> IO Adjustment
- rangeSetAdjustment :: RangeClass self => self -> Adjustment -> IO ()
- data UpdateType
  - = UpdateContinuous
  - | UpdateDiscontinuous
  - | UpdateDelayed
- rangeGetUpdatePolicy :: RangeClass self => self -> IO UpdateType
- rangeSetUpdatePolicy :: RangeClass self => self -> UpdateType -> IO ()
- rangeGetInverted :: RangeClass self => self -> IO Bool
- rangeSetInverted :: RangeClass self => self -> Bool -> IO ()
- rangeGetValue :: RangeClass self => self -> IO Double
- rangeSetValue :: RangeClass self => self -> Double -> IO ()
- rangeSetIncrements :: RangeClass self => self -> Double -> Double -> IO ()
- rangeSetRange :: RangeClass self => self -> Double -> Double -> IO ()
- data ScrollType
  - = ScrollNone
  - | ScrollJump
  - | ScrollStepBackward
  - | ScrollStepForward
  - | ScrollPageBackward
  - | ScrollPageForward
  - | ScrollStepUp
  - | ScrollStepDown
  - | ScrollPageUp
  - | ScrollPageDown
  - | ScrollStepLeft
  - | ScrollStepRight
  - | ScrollPageLeft
  - | ScrollPageRight
  - | ScrollStart
  - | ScrollEnd
- data SensitivityType
  - = SensitivityAuto
  - | SensitivityOn
  - | SensitivityOff
- rangeSetLowerStepperSensitivity :: RangeClass self => self -> SensitivityType -> IO ()
- rangeGetLowerStepperSensitivity :: RangeClass self => self -> IO SensitivityType
- rangeSetUpperStepperSensitivity :: RangeClass self => self -> SensitivityType -> IO ()
- rangeGetUpperStepperSensitivity :: RangeClass self => self -> IO SensitivityType
- rangeGetMinSliderSize :: RangeClass self => self -> IO Int
- rangeGetRangeRect :: RangeClass self => self -> IO Rectangle
- rangeGetSliderRange :: RangeClass self => self -> IO (Maybe (Int, Int))
- rangeGetSliderSizeFixed :: RangeClass self => self -> IO Bool
- rangeSetMinSliderSize :: RangeClass self => self -> Bool -> IO ()
- rangeSetSliderSizeFixed :: RangeClass self => self -> Bool -> IO ()
- rangeUpdatePolicy :: RangeClass self => Attr self UpdateType
- rangeAdjustment :: RangeClass self => Attr self Adjustment
- rangeInverted :: RangeClass self => Attr self Bool
- rangeLowerStepperSensitivity :: RangeClass self => Attr self SensitivityType
- rangeUpperStepperSensitivity :: RangeClass self => Attr self SensitivityType
- rangeValue :: RangeClass self => Attr self Double
- rangeSliderSizeFixed :: RangeClass self => Attr self Bool
- rangeMinSliderSize :: RangeClass self => ReadWriteAttr self Int Bool
- adjustBounds :: RangeClass self => Signal self (Double -> IO ())
- valueChanged :: RangeClass self => Signal self (IO ())
- changeValue :: RangeClass self => Signal self (ScrollType -> Double -> IO Bool)
- onMoveSlider :: RangeClass self => self -> (ScrollType -> IO ()) -> IO (ConnectId self)
- afterMoveSlider :: RangeClass self => self -> (ScrollType -> IO ()) -> IO (ConnectId self)
- onAdjustBounds :: RangeClass self => self -> (Double -> IO ()) -> IO (ConnectId self)
- afterAdjustBounds :: RangeClass self => self -> (Double -> IO ()) -> IO (ConnectId self)
- onRangeChangeValue :: RangeClass self => self -> (ScrollType -> Double -> IO Bool) -> IO (ConnectId self)
- afterRangeChangeValue :: RangeClass self => self -> (ScrollType -> Double -> IO Bool) -> IO (ConnectId self)
- onRangeValueChanged :: RangeClass self => self -> IO () -> IO (ConnectId self)
- afterRangeValueChanged :: RangeClass self => self -> IO () -> IO (ConnectId self)

# Description

For signals regarding a change in the range or increments, refer to `Adjustment` which is contained in the `Range` object.

# Class Hierarchy

     | GObject
     | +----Object
     | +----Widget
     | +----Range
     | +----Scale
     | +----Scrollbar

# Types

data Range

Instances

Eq Range |
Ord Range |
GObjectClass Range |
RangeClass Range |
WidgetClass Range |
ObjectClass Range |

class WidgetClass o => RangeClass o

Instances

RangeClass VScrollbar |
RangeClass HScrollbar |
RangeClass Scrollbar |
RangeClass VScale |
RangeClass HScale |
RangeClass Scale |
RangeClass Range |

castToRange :: GObjectClass obj => obj -> Range

gTypeRange :: GType

toRange :: RangeClass o => o -> Range

# Methods

rangeGetAdjustment

Arguments

:: RangeClass self |
=> self |
-> IO Adjustment | returns a `Adjustment`

Get the `Adjustment` which is the "model" object for `Range`. See `rangeSetAdjustment` for details.

rangeSetAdjustment

Arguments

:: RangeClass self |
=> self |
-> Adjustment | `adjustment` - a `Adjustment`
-> IO () |

Sets the adjustment to be used as the "model" object for this range widget. The adjustment indicates the current range value, the minimum and maximum range values, the step/page increments used for keybindings and scrolling, and the page size. The page size is normally 0 for `Scale` and nonzero for `Scrollbar`, and indicates the size of the visible area of the widget being scrolled. The page size affects the size of the scrollbar slider.

data UpdateType

Updating types for range widgets (determines when the `"connectToValueChanged"` signal is emitted by the widget)

Constructors

UpdateContinuous |
UpdateDiscontinuous |
UpdateDelayed |

Instances

Enum UpdateType |
Eq UpdateType |
Show UpdateType |

rangeGetUpdatePolicy

Arguments

:: RangeClass self |
=> self |
-> IO UpdateType | returns the current update policy

Gets the update policy of `range`. See `rangeSetUpdatePolicy`.

rangeSetUpdatePolicy

Arguments

:: RangeClass self |
=> self |
-> UpdateType | `policy` - update policy
-> IO () |

Sets the update policy for the range. `UpdateContinuous` means that anytime the range slider is moved, the range value will change and the value_changed signal will be emitted. `UpdateDelayed` means that the value will be updated after a brief timeout where no slider motion occurs, so updates are spaced by a short time rather than continuous. `UpdateDiscontinuous` means that the value will only be updated when the user releases the button and ends the slider drag operation.

rangeGetInverted

Arguments

:: RangeClass self |
=> self |
-> IO Bool | returns `True` if the range is inverted

Gets the value set by `rangeSetInverted`.

rangeSetInverted

Arguments

:: RangeClass self |
=> self |
-> Bool | `setting` - `True` to invert the range
-> IO () |

Ranges normally move from lower to higher values as the slider moves from top to bottom or left to right. Inverted ranges have higher values at the top or on the right rather than on the bottom or left.

rangeGetValue

Arguments

:: RangeClass self |
=> self |
-> IO Double | returns current value of the range.

Gets the current value of the range.

rangeSetValue

Arguments

:: RangeClass self |
=> self |
-> Double | `value` - new value of the range
-> IO () |

Sets the current value of the range; if the value is outside the minimum or maximum range values, it will be clamped to fit inside them. The range emits the `valueChanged` signal if the value changes.

rangeSetIncrements

Arguments

:: RangeClass self |
=> self |
-> Double | `step` - step size
-> Double | `page` - page size
-> IO () |

Sets the step and page sizes for the range. The step size is used when the user clicks the `Scrollbar` arrows or moves `Scale` via arrow keys. The page size is used for example when moving via Page Up or Page Down keys.

rangeSetRange

Arguments

:: RangeClass self |
=> self |
-> Double | `min` - minimum range value
-> Double | `max` - maximum range value
-> IO () |

Sets the allowable values in the `Range`, and clamps the range value to be between `min` and `max`. (If the range has a non-zero page size, it is clamped between `min` and `max` - page-size.)

data ScrollType

Scrolling type

Constructors

ScrollNone |
ScrollJump |
ScrollStepBackward |
ScrollStepForward |
ScrollPageBackward |
ScrollPageForward |
ScrollStepUp |
ScrollStepDown |
ScrollPageUp |
ScrollPageDown |
ScrollStepLeft |
ScrollStepRight |
ScrollPageLeft |
ScrollPageRight |
ScrollStart |
ScrollEnd |

Instances

Enum ScrollType |
Eq ScrollType |
Show ScrollType |

data SensitivityType

Determines how Gtk+ handles the sensitivity of stepper arrows at the end of range widgets.

- `SensitivityAuto`: the arrow is made insensitive if the thumb is at the end
- `SensitivityOn`: the arrow is alwasy sensitive
- `SensitivityOff`: the arrow is always insensitive

Constructors

SensitivityAuto |
SensitivityOn |
SensitivityOff |

Instances

Bounded SensitivityType |
Enum SensitivityType |
Eq SensitivityType |
Show SensitivityType |

rangeSetLowerStepperSensitivity

Arguments

:: RangeClass self |
=> self |
-> SensitivityType | `sensitivity` - the lower stepper's sensitivity policy.
-> IO () |

Sets the sensitivity policy for the stepper that points to the 'lower' end of the `Range'`s adjustment.

- Available since Gtk+ version 2.10

rangeGetLowerStepperSensitivity

Arguments

:: RangeClass self |
=> self |
-> IO SensitivityType | returns The lower stepper's sensitivity policy.

Gets the sensitivity policy for the stepper that points to the 'lower' end of the `Range'`s adjustment.

- Available since Gtk+ version 2.10

rangeSetUpperStepperSensitivity

Arguments

:: RangeClass self |
=> self |
-> SensitivityType | `sensitivity` - the upper stepper's sensitivity policy.
-> IO () |

Sets the sensitivity policy for the stepper that points to the 'upper' end of the `Range'`s adjustment.

- Available since Gtk+ version 2.10

rangeGetUpperStepperSensitivity

Arguments

:: RangeClass self |
=> self |
-> IO SensitivityType | returns The upper stepper's sensitivity policy.

Gets the sensitivity policy for the stepper that points to the 'upper' end of the `Range'`s adjustment.

- Available since Gtk+ version 2.10

rangeGetMinSliderSize

Arguments

:: RangeClass self |
=> self |
-> IO Int | returns The minimum size of the range's slider.

This function is useful mainly for `Range` subclasses.

See `rangeSetMinSliderSize`.

rangeGetRangeRect :: RangeClass self => self -> IO Rectangle

This function returns the area that contains the range's trough and its steppers, in `DrawWindow` coordinates.

This function is useful mainly for `Range` subclasses.

rangeGetSliderRange :: RangeClass self => self -> IO (Maybe (Int, Int))

This function returns sliders range along the long dimension, in `DrawWindow` coordinates.

This function is useful mainly for `Range` subclasses.

rangeGetSliderSizeFixed

Arguments

:: RangeClass self |
=> self |
-> IO Bool | returns whether the range's slider has a fixed size.

This function is useful mainly for `Range` subclasses.

See `rangeSetSliderSizeFixed`.

rangeSetMinSliderSize :: RangeClass self => self -> Bool -> IO ()

Sets the minimum size of the range's slider.

This function is useful mainly for `Range` subclasses.

rangeSetSliderSizeFixed

Arguments

:: RangeClass self |
=> self |
-> Bool | `sizeFixed` `True` to make the slider size constant
-> IO () |

Sets whether the range's slider has a fixed size, or a size that depends on it's adjustment's page size.

This function is useful mainly for `Range` subclasses.

# Attributes

rangeUpdatePolicy :: RangeClass self => Attr self UpdateType

How the range should be updated on the screen.

Default value: `UpdateContinuous`

rangeAdjustment :: RangeClass self => Attr self Adjustment

The `Adjustment` that contains the current value of this range object.

rangeInverted :: RangeClass self => Attr self Bool

Invert direction slider moves to increase range value.

Default value: `False`

rangeLowerStepperSensitivity :: RangeClass self => Attr self SensitivityType

The sensitivity policy for the stepper that points to the adjustment's lower side.

Default value: `SensitivityAuto`

rangeUpperStepperSensitivity :: RangeClass self => Attr self SensitivityType

The sensitivity policy for the stepper that points to the adjustment's upper side.

Default value: `SensitivityAuto`

rangeValue :: RangeClass self => Attr self Double

'value' property. See `rangeGetValue` and `rangeSetValue`

rangeSliderSizeFixed :: RangeClass self => Attr self Bool

Wheter range's slikder has a fixed size, or a size that depends on it's adjustment's page size.

rangeMinSliderSize :: RangeClass self => ReadWriteAttr self Int Bool

Get/Set sliders range along the long dimension, in `DrawWindow` coordinates.

# Signals

adjustBounds :: RangeClass self => Signal self (Double -> IO ())

valueChanged :: RangeClass self => Signal self (IO ())

Emitted when the range value changes.

changeValue :: RangeClass self => Signal self (ScrollType -> Double -> IO Bool)

The `changeValue` signal is emitted when a scroll action is performed on a range. It allows an application to determine the type of scroll event that occurred and the resultant new value. The application can handle the event itself and return `True` to prevent further processing. Or, by returning `False`, it can pass the event to other handlers until the default Gtk+ handler is reached.

The value parameter is unrounded. An application that overrides the `changeValue` signal is responsible for clamping the value to the desired number of decimal digits.

It is not possible to use delayed update policies in an overridden `changeValue` handler.

- Available since Gtk+ version 2.6

# Deprecated

onMoveSlider :: RangeClass self => self -> (ScrollType -> IO ()) -> IO (ConnectId self)

afterMoveSlider :: RangeClass self => self -> (ScrollType -> IO ()) -> IO (ConnectId self)

Emitted when the user presses a key (e.g. Page Up, Home, Right Arrow) to move the slider. The `ScrollType` parameter gives the key that was pressed.

Usually you should use `onRangeValueChanged` / `afterRangeValueChanged` instead.

onAdjustBounds :: RangeClass self => self -> (Double -> IO ()) -> IO (ConnectId self)

afterAdjustBounds :: RangeClass self => self -> (Double -> IO ()) -> IO (ConnectId self)

Emitted when the range is adjusted by user action. Note the value can be outside the bounds of the range since it depends on the mouse position.

Usually you should use `onRangeValueChanged` / `afterRangeValueChanged` instead.

onRangeChangeValue :: RangeClass self => self -> (ScrollType -> Double -> IO Bool) -> IO (ConnectId self)

afterRangeChangeValue :: RangeClass self => self -> (ScrollType -> Double -> IO Bool) -> IO (ConnectId self)

Emitted when a scroll action is performed on a range. It allows an application to determine the type of scroll event that occurred and the resultant new value. The application can handle the event itself and return `True` to prevent further processing. Or, by returning `False`, it can pass the event to other handlers until the default GTK+ handler is reached.

- Since Gtk 2.6

onRangeValueChanged :: RangeClass self => self -> IO () -> IO (ConnectId self)

afterRangeValueChanged :: RangeClass self => self -> IO () -> IO (ConnectId self)

Emitted when the range value is changed either programmatically or by user action.