#[repr(transparent)]pub struct SizeGroup { /* private fields */ }Expand description
SizeGroup 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 Grid.
In detail, the size requested for each widget in a SizeGroup 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 set_mode()) 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 SizeGroup 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.
SizeGroup objects are referenced by each widget in the size group,
so once you have added all widgets to a SizeGroup, you can drop
the initial reference to the size group with g_object_unref(). 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 SizeGroupMode::Horizontal or SizeGroupMode::Both, 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
SizeGroupMode::Vertical or SizeGroupMode::Both.
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 SizeGroupMode::Vertical or SizeGroupMode::Both:
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 property::Label::width-chars 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
An example of a UI definition fragment with SizeGroup:
<object class="GtkSizeGroup">
<property name="mode">horizontal</property>
<widgets>
<widget name="radio1"/>
<widget name="radio2"/>
</widgets>
</object>
Implements
Implementations§
source§impl SizeGroup
impl SizeGroup
sourcepub fn new(mode: SizeGroupMode) -> SizeGroup
pub fn new(mode: SizeGroupMode) -> SizeGroup
sourcepub fn add_widget(&self, widget: &impl IsA<Widget>)
pub fn add_widget(&self, widget: &impl IsA<Widget>)
Adds a widget to a SizeGroup.
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 set_mode().
When the widget is destroyed or no longer referenced elsewhere, it will be removed from the size group.
widget
the Widget to add
sourcepub fn mode(&self) -> SizeGroupMode
pub fn mode(&self) -> SizeGroupMode
sourcepub fn widgets(&self) -> Vec<Widget>
pub fn widgets(&self) -> Vec<Widget>
Returns the list of widgets associated with @self.
Returns
a GSList of
widgets. The list is owned by GTK and should not be modified.
sourcepub fn remove_widget(&self, widget: &impl IsA<Widget>)
pub fn remove_widget(&self, widget: &impl IsA<Widget>)
sourcepub fn set_mode(&self, mode: SizeGroupMode)
pub fn set_mode(&self, mode: SizeGroupMode)
Sets the SizeGroupMode 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
(SizeGroupMode::Horizontal) all have the same vertical requisition
(SizeGroupMode::Vertical), or should all have the same requisition
in both directions (SizeGroupMode::Both).
mode
the mode to set for the size group.
pub fn connect_mode_notify<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
Trait Implementations§
source§impl Ord for SizeGroup
impl Ord for SizeGroup
source§impl<OT: ObjectType> PartialEq<OT> for SizeGroup
impl<OT: ObjectType> PartialEq<OT> for SizeGroup
source§impl<OT: ObjectType> PartialOrd<OT> for SizeGroup
impl<OT: ObjectType> PartialOrd<OT> for SizeGroup
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self and other) and is used by the <=
operator. Read moresource§impl StaticType for SizeGroup
impl StaticType for SizeGroup
source§fn static_type() -> Type
fn static_type() -> Type
Self.impl Eq for SizeGroup
impl IsA<Buildable> for SizeGroup
Auto Trait Implementations§
impl RefUnwindSafe for SizeGroup
impl !Send for SizeGroup
impl !Sync for SizeGroup
impl Unpin for SizeGroup
impl UnwindSafe for SizeGroup
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