Trait gtk4::prelude::LayoutManagerExt

pub trait LayoutManagerExt: 'static {
    fn allocate<P: IsA<Widget>>(
        &self, 
        widget: &P, 
        width: i32, 
        height: i32, 
        baseline: i32
    );
    fn layout_child<P: IsA<Widget>>(&self, child: &P) -> Option<LayoutChild>;
    fn request_mode(&self) -> SizeRequestMode;
    fn widget(&self) -> Option<Widget>;
    fn layout_changed(&self);
    fn measure<P: IsA<Widget>>(
        &self, 
        widget: &P, 
        orientation: Orientation, 
        for_size: i32
    ) -> (i32, i32, i32, i32);
}

Trait containing all LayoutManager methods.

Implementors

BinLayout, BoxLayout, CenterLayout, ConstraintLayout, FixedLayout, GridLayout, LayoutManager, OverlayLayout

Required methods

fn allocate<P: IsA<Widget>>(
    &self,
    widget: &P,
    width: i32,
    height: i32,
    baseline: i32
)

Assigns the given width, height, and baseline to a widget, and computes the position and sizes of the children of the widget using the layout management policy of self.

widget

the Widget using self

width

the new width of the widget

height

the new height of the widget

baseline

the baseline position of the widget, or -1

fn layout_child<P: IsA<Widget>>(&self, child: &P) -> Option<LayoutChild>

Retrieves a LayoutChild instance for the LayoutManager, creating one if necessary.

The child widget must be a child of the widget using self.

The LayoutChild instance is owned by the LayoutManager, and is guaranteed to exist as long as child is a child of the Widget using the given LayoutManager.

child

a Widget

Returns

a LayoutChild

fn request_mode(&self) -> SizeRequestMode

Retrieves the request mode of self.

Returns

a SizeRequestMode

fn widget(&self) -> Option<Widget>

Retrieves the Widget using the given LayoutManager.

Returns

a Widget

fn layout_changed(&self)

Queues a resize on the Widget using self, if any.

This function should be called by subclasses of LayoutManager in response to changes to their layout management policies.

fn measure<P: IsA<Widget>>(
    &self,
    widget: &P,
    orientation: Orientation,
    for_size: i32
) -> (i32, i32, i32, i32)

Measures the size of the widget using self, for the given orientation and size.

See the Widget documentation on layout management for more details.

widget

the Widget using self

orientation

the orientation to measure

for_size

Size for the opposite of orientation; for instance, if the orientation is Orientation::Horizontal, this is the height of the widget; if the orientation is Orientation::Vertical, this is the width of the widget. This allows to measure the height for the given width, and the width for the given height. Use -1 if the size is not known

Returns

minimum

the minimum size for the given size and orientation

natural

the natural, or preferred size for the given size and orientation

minimum_baseline

the baseline position for the minimum size

natural_baseline

the baseline position for the natural size

Implementors

impl<O: IsA<LayoutManager>> LayoutManagerExt for O