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.Buttons.RadioButton

Contents

- Detail
- Class Hierarchy
- Types
- Constructors
- Compatibilty aliases
- Methods
- Attributes
- Signals
- Deprecated

Description

A choice from multiple check buttons

Synopsis

- data RadioButton
- class CheckButtonClass o => RadioButtonClass o
- castToRadioButton :: GObjectClass obj => obj -> RadioButton
- gTypeRadioButton :: GType
- toRadioButton :: RadioButtonClass o => o -> RadioButton
- radioButtonNew :: IO RadioButton
- radioButtonNewWithLabel :: String -> IO RadioButton
- radioButtonNewWithMnemonic :: String -> IO RadioButton
- radioButtonNewFromWidget :: RadioButton -> IO RadioButton
- radioButtonNewWithLabelFromWidget :: RadioButton -> String -> IO RadioButton
- radioButtonNewWithMnemonicFromWidget :: RadioButton -> String -> IO RadioButton
- radioButtonNewJoinGroup :: RadioButton -> IO RadioButton
- radioButtonNewJoinGroupWithLabel :: RadioButton -> String -> IO RadioButton
- radioButtonNewJoinGroupWithMnemonic :: RadioButton -> String -> IO RadioButton
- radioButtonSetGroup :: RadioButton -> RadioButton -> IO ()
- radioButtonGetGroup :: RadioButton -> IO [RadioButton]
- radioButtonGroup :: ReadWriteAttr RadioButton [RadioButton] RadioButton
- groupChanged :: RadioButtonClass self => Signal self (IO ())
- onGroupChanged :: RadioButtonClass self => self -> IO () -> IO (ConnectId self)
- afterGroupChanged :: RadioButtonClass self => self -> IO () -> IO (ConnectId self)

# Detail

A single radio button performs the same basic function as a `CheckButton`, as its position in the object hierarchy reflects. It is only when multiple radio buttons are grouped together that they become a different user interface component in their own right.

Every radio button is a member of some group of radio buttons. When one is selected, all other radio buttons in the same group are deselected. A `RadioButton` is one way of giving the user a choice from many options.

Radio button widgets are created with `radioButtonNew`. Optionally, `radioButtonNewWithLabel` can be used if you want a text label on the radio button.

For the radio button functions that take an existing group, the groups are represented by any of their members. So when adding widgets to an existing group of radio buttons, use `radioButtonNewFromWidget` with a `RadioButton` that is already a member of the group. The convenience function `radioButtonNewWithLabelFromWidget` is also provided.

To remove a `RadioButton` from one group and make it part of a new one, use `radioButtonSetGroup`.

- How to create a group of two radio buttons.

     createRadioButtons :: IO ()
     createRadioButtons = do
     window <- windowNew
     box <- vBoxNew True 2

     -- Create a radio button with a Entry widget
     radio1 <- radioButtonNew
     entry <- entryNew
     containerAdd radio1 entry

     -- Create a radio button with a label
     radio2 <- radioButtonNewWithLabelFromWidget
     radio1 "I'm the second radio button."

     -- Pack them into a box, then show all the widgets
     boxPackStart box radio1 PackGrow 2
     boxPackStart box radio2 PackGrow 2
     containerAdd window box
     widgetShowAll window

When an unselected button in the group is clicked the clicked button receives the "toggled" signal, as does the previously selected button. Inside the "toggled" handler, `Graphics.UI.Gtk.Buttons.ToggleButton.toggleButtonGetActive` can be used to determine if the button has been selected or deselected.

# Class Hierarchy

     | GObject
     | +----Object
     | +----Widget
     | +----Container
     | +----Bin
     | +----Button
     | +----ToggleButton
     | +----CheckButton
     | +----RadioButton

# Types

data RadioButton

Instances

Eq RadioButton |
Ord RadioButton |
GObjectClass RadioButton |
RadioButtonClass RadioButton |
CheckButtonClass RadioButton |
ToggleButtonClass RadioButton |
ButtonClass RadioButton |
BinClass RadioButton |
ContainerClass RadioButton |
WidgetClass RadioButton |
ObjectClass RadioButton |

class CheckButtonClass o => RadioButtonClass o

Instances

RadioButtonClass RadioButton |

castToRadioButton :: GObjectClass obj => obj -> RadioButton

gTypeRadioButton :: GType

toRadioButton :: RadioButtonClass o => o -> RadioButton

# Constructors

radioButtonNew :: IO RadioButton

Creates a new `RadioButton` with a new group. To be of any practical value, a widget should then be packed into the radio button.

radioButtonNewWithLabel :: String -> IO RadioButton

Creates a new `RadioButton` with a text label.

radioButtonNewWithMnemonic

Arguments

:: String | `label` - the text of the button, with an underscore in front of the mnemonic character
-> IO RadioButton |

Creates a new `RadioButton` containing a label. The label will be created using `Graphics.UI.Gtk.Display.Label.labelNewWithMnemonic`, so underscores in `label` indicate the mnemonic for the button.

radioButtonNewFromWidget

Arguments

:: RadioButton | `groupMember` - a member of an existing radio button group, to which the new radio button will be added.
-> IO RadioButton |

Creates a new `RadioButton`, adding it to the same group as the group to which `groupMember` belongs. As with `radioButtonNew`, a widget should be packed into the radio button.

radioButtonNewWithLabelFromWidget

Arguments

:: RadioButton | `groupMember` - a member of an existing radio button group, to which the new radio button will be added.
-> String | `label` - a text string to display next to the radio button.
-> IO RadioButton |

Creates a new `RadioButton` with a text label, adding it to the same group as the group to which `groupMember` belongs.

radioButtonNewWithMnemonicFromWidget

Arguments

:: RadioButton | `groupMember` - a member of an existing radio button group, to which the new radio button will be added.
-> String | `label` - the text of the button, with an underscore in front of the mnemonic character
-> IO RadioButton |

Creates a new `RadioButton` containing a label, adding it to the same group as the group to which `groupMember` belongs. The label will be created using `Graphics.UI.Gtk.Display.Label.labelNewWithMnemonic`, so underscores in `label` indicate the mnemonic for the button.

# Compatibilty aliases

radioButtonNewJoinGroup

Arguments

:: RadioButton | `groupMember` - a member of an existing radio button group, to which the new radio button will be added.
-> IO RadioButton |

Alias for `radioButtonNewFromWidget`.

radioButtonNewJoinGroupWithLabel

Arguments

:: RadioButton | `groupMember` - a member of an existing radio button group, to which the new radio button will be added.
-> String | `label` - a text string to display next to the radio button.
-> IO RadioButton |

Alias for `radioButtonNewWithLabelFromWidget`.

radioButtonNewJoinGroupWithMnemonic

Arguments

:: RadioButton | `groupMember` - a member of an existing radio button group, to which the new radio button will be added.
-> String | `label` - the text of the button, with an underscore in front of the mnemonic character
-> IO RadioButton |

Alias for `radioButtonNewWithMnemonicFromWidget`.

# Methods

radioButtonSetGroup

Arguments

:: RadioButton |
-> RadioButton | `groupMember` - a member of an existing radio button group, to which this radio button will be added.
-> IO () |

Sets a `RadioButton`s group. It should be noted that this does not change the layout of your interface in any way, so if you are changing the group, it is likely you will need to re-arrange the user interface to reflect these changes.

radioButtonGetGroup

Arguments

:: RadioButton |
-> IO [RadioButton] | returns a list containing all the radio buttons in the same group as this radio button.

Retrieves the group assigned to a radio button.

# Attributes

radioButtonGroup :: ReadWriteAttr RadioButton [RadioButton] RadioButton

Sets a new group for a radio button.

# Signals

groupChanged :: RadioButtonClass self => Signal self (IO ())

Emitted when the group of radio buttons that a radio button belongs to changes. This is emitted when a radio button switches from being alone to being part of a group of 2 or more buttons, or vice-versa, and when a buttton is moved from one group of 2 or more buttons to a different one, but not when the composition of the group that a button belongs to changes.

- Available since Gtk+ version 2.4

# Deprecated

onGroupChanged :: RadioButtonClass self => self -> IO () -> IO (ConnectId self)

afterGroupChanged :: RadioButtonClass self => self -> IO () -> IO (ConnectId self)

Emitted when the group of radio buttons that a radio button belongs to changes. This is emitted when a radio button switches from being alone to being part of a group of 2 or more buttons, or vice-versa, and when a buttton is moved from one group of 2 or more buttons to a different one, but not when the composition of the group that a button belongs to changes.