GI.Gtk.Objects.SizeGroup

GtkSizeGroup groups widgets together so they all request the same size.

This is typically useful when you want a column of widgets to have the same size, but you can’t use a GtkGrid.

In detail, the size requested for each widget in a GtkSizeGroup is the maximum of the sizes that would have been requested for each widget in the size group if they were not in the size group. The mode of the size group (see sizeGroupSetMode) determines whether this applies to the horizontal size, the vertical size, or both sizes.

Note that size groups only affect the amount of space requested, not the size that the widgets finally receive. If you want the widgets in a GtkSizeGroup to actually be the same size, you need to pack them in such a way that they get the size they request and not more.

GtkSizeGroup objects are referenced by each widget in the size group, so once you have added all widgets to a GtkSizeGroup, you can drop the initial reference to the size group with objectUnref. If the widgets in the size group are subsequently destroyed, then they will be removed from the size group and drop their references on the size group; when all widgets have been removed, the size group will be freed.

Widgets can be part of multiple size groups; GTK will compute the horizontal size of a widget from the horizontal requisition of all widgets that can be reached from the widget by a chain of size groups of type SizeGroupModeHorizontal or SizeGroupModeBoth, and the vertical size from the vertical requisition of all widgets that can be reached from the widget by a chain of size groups of type SizeGroupModeVertical or SizeGroupModeBoth.

Note that only non-contextual sizes of every widget are ever consulted by size groups (since size groups have no knowledge of what size a widget will be allocated in one dimension, it cannot derive how much height a widget will receive for a given width). When grouping widgets that trade height for width in mode SizeGroupModeVertical or SizeGroupModeBoth: the height for the minimum width will be the requested height for all widgets in the group. The same is of course true when horizontally grouping width for height widgets.

Widgets that trade height-for-width should set a reasonably large minimum width by way of Label:widthChars for instance. Widgets with static sizes as well as widgets that grow (such as ellipsizing text) need no such considerations.

GtkSizeGroup as GtkBuildable

Size groups can be specified in a UI definition by placing an <object> element with class="GtkSizeGroup" somewhere in the UI definition. The widgets that belong to the size group are specified by a <widgets> element that may contain multiple <widget> elements, one for each member of the size group. The ”name” attribute gives the id of the widget.

An example of a UI definition fragment with GtkSizeGroup:

xml code

<object class="GtkSizeGroup">
  <property name="mode">horizontal</property>
  <widgets>
    <widget name="radio1"/>
    <widget name="radio2"/>
  </widgets>
</object>

Exported types

newtype SizeGroup

Memory-managed wrapper type.

Constructors

SizeGroup (ManagedPtr SizeGroup)

Instances

Eq SizeGroup

Defined in GI.Gtk.Objects.SizeGroup

Methods

(==) :: SizeGroup -> SizeGroup -> Bool

(/=) :: SizeGroup -> SizeGroup -> Bool

GObject SizeGroup

Defined in GI.Gtk.Objects.SizeGroup

ManagedPtrNewtype SizeGroup

Defined in GI.Gtk.Objects.SizeGroup

Methods

toManagedPtr :: SizeGroup -> ManagedPtr SizeGroup

TypedObject SizeGroup

Defined in GI.Gtk.Objects.SizeGroup

Methods

glibType :: IO GType

HasParentTypes SizeGroup

Defined in GI.Gtk.Objects.SizeGroup

IsGValue (Maybe SizeGroup)

Convert SizeGroup to and from GValue. See toGValue and fromGValue.

Defined in GI.Gtk.Objects.SizeGroup

Methods

gvalueGType_ :: IO GType

gvalueSet_ :: Ptr GValue -> Maybe SizeGroup -> IO ()

gvalueGet_ :: Ptr GValue -> IO (Maybe SizeGroup)

type ParentTypes SizeGroup

Defined in GI.Gtk.Objects.SizeGroup

type ParentTypes SizeGroup = '[Object, Buildable]

class (GObject o, IsDescendantOf SizeGroup o) => IsSizeGroup o

Type class for types which can be safely cast to SizeGroup, for instance with toSizeGroup.

Instances

(GObject o, IsDescendantOf SizeGroup o) => IsSizeGroup o

Defined in GI.Gtk.Objects.SizeGroup

toSizeGroup :: (MonadIO m, IsSizeGroup o) => o -> m SizeGroup

Cast to SizeGroup, for types for which this is known to be safe. For general casts, use castTo.

Methods

Click to display all available methods, including inherited ones

Methods

addWidget, bindProperty, bindPropertyFull, forceFloating, freezeNotify, getv, isFloating, notify, notifyByPspec, ref, refSink, removeWidget, runDispose, stealData, stealQdata, thawNotify, unref, watchClosure.

Getters

getBuildableId, getData, getMode, getProperty, getQdata, getWidgets.

Setters

setData, setDataFull, setMode, setProperty.

addWidget

sizeGroupAddWidget

Arguments

:: (HasCallStack, MonadIO m, IsSizeGroup a, IsWidget b)

=> a

sizeGroup: a GtkSizeGroup

-> b

widget: the GtkWidget to add

-> m ()

Adds a widget to a GtkSizeGroup.

In the future, the requisition of the widget will be determined as the maximum of its requisition and the requisition of the other widgets in the size group. Whether this applies horizontally, vertically, or in both directions depends on the mode of the size group. See sizeGroupSetMode.

When the widget is destroyed or no longer referenced elsewhere, it will be removed from the size group.

getMode

sizeGroupGetMode

Arguments

:: (HasCallStack, MonadIO m, IsSizeGroup a)

=> a

sizeGroup: a GtkSizeGroup

-> m SizeGroupMode

Returns: the current mode of the size group.

Gets the current mode of the size group.

getWidgets

sizeGroupGetWidgets

Arguments

:: (HasCallStack, MonadIO m, IsSizeGroup a)

=> a

sizeGroup: a GtkSizeGroup

-> m [Widget]

Returns: a GSList of widgets. The list is owned by GTK and should not be modified.

Returns the list of widgets associated with sizeGroup.

new

sizeGroupNew

Arguments

:: (HasCallStack, MonadIO m)

=> SizeGroupMode

mode: the mode for the new size group.

-> m SizeGroup

Returns: a newly created GtkSizeGroup

Create a new GtkSizeGroup.

removeWidget

sizeGroupRemoveWidget

Arguments

:: (HasCallStack, MonadIO m, IsSizeGroup a, IsWidget b)

=> a

sizeGroup: a GtkSizeGroup

-> b

widget: the GtkWidget to remove

-> m ()

Removes a widget from a GtkSizeGroup.

setMode

sizeGroupSetMode

Arguments

:: (HasCallStack, MonadIO m, IsSizeGroup a)

=> a

sizeGroup: a GtkSizeGroup

-> SizeGroupMode

mode: the mode to set for the size group.

-> m ()

Sets the GtkSizeGroupMode of the size group.

The mode of the size group determines whether the widgets in the size group should all have the same horizontal requisition (SizeGroupModeHorizontal) all have the same vertical requisition (SizeGroupModeVertical), or should all have the same requisition in both directions (SizeGroupModeBoth).

Properties

mode

The direction in which the size group affects requested sizes.

constructSizeGroupMode :: (IsSizeGroup o, MonadIO m) => SizeGroupMode -> m (GValueConstruct o)

Construct a GValueConstruct with valid value for the “mode” property. This is rarely needed directly, but it is used by new.

getSizeGroupMode :: (MonadIO m, IsSizeGroup o) => o -> m SizeGroupMode

Get the value of the “mode” property. When overloading is enabled, this is equivalent to

get sizeGroup #mode

setSizeGroupMode :: (MonadIO m, IsSizeGroup o) => o -> SizeGroupMode -> m ()

Set the value of the “mode” property. When overloading is enabled, this is equivalent to

set sizeGroup [ #mode := value ]