Trait wayland_protocols::xdg_shell::server::xdg_positioner::RequestHandler

pub trait RequestHandler {
    fn destroy(&mut self, object: XdgPositioner) { ... }
    fn set_size(&mut self, object: XdgPositioner, width: i32, height: i32) { ... }
    fn set_anchor_rect(
        &mut self, 
        object: XdgPositioner, 
        x: i32, 
        y: i32, 
        width: i32, 
        height: i32
    ) { ... }
    fn set_anchor(&mut self, object: XdgPositioner, anchor: Anchor) { ... }
    fn set_gravity(&mut self, object: XdgPositioner, gravity: Gravity) { ... }
    fn set_constraint_adjustment(
        &mut self, 
        object: XdgPositioner, 
        constraint_adjustment: u32
    ) { ... }
    fn set_offset(&mut self, object: XdgPositioner, x: i32, y: i32) { ... }
}

An interface for handling requests.

Provided methods

fn destroy(&mut self, object: XdgPositioner)

destroy the xdg_positioner object

Notify the compositor that the xdg_positioner will no longer be used.

This is a destructor, you cannot send requests to this object any longer once this method is called.

fn set_size(&mut self, object: XdgPositioner, width: i32, height: i32)

set the size of the to-be positioned rectangle

Set the size of the surface that is to be positioned with the positioner object. The size is in surface-local coordinates and corresponds to the window geometry. See xdg_surface.set_window_geometry.

If a zero or negative size is set the invalid_input error is raised.

fn set_anchor_rect(
    &mut self,
    object: XdgPositioner,
    x: i32,
    y: i32,
    width: i32,
    height: i32
)

set the anchor rectangle within the parent surface

Specify the anchor rectangle within the parent surface that the child surface will be placed relative to. The rectangle is relative to the window geometry as defined by xdg_surface.set_window_geometry of the parent surface.

When the xdg_positioner object is used to position a child surface, the anchor rectangle may not extend outside the window geometry of the positioned child's parent surface.

If a negative size is set the invalid_input error is raised.

fn set_anchor(&mut self, object: XdgPositioner, anchor: Anchor)

set anchor rectangle anchor

Defines the anchor point for the anchor rectangle. The specified anchor is used derive an anchor point that the child surface will be positioned relative to. If a corner anchor is set (e.g. 'top_left' or 'bottom_right'), the anchor point will be at the specified corner; otherwise, the derived anchor point will be centered on the specified edge, or in the center of the anchor rectangle if no edge is specified.

fn set_gravity(&mut self, object: XdgPositioner, gravity: Gravity)

set child surface gravity

Defines in what direction a surface should be positioned, relative to the anchor point of the parent surface. If a corner gravity is specified (e.g. 'bottom_right' or 'top_left'), then the child surface will be placed towards the specified gravity; otherwise, the child surface will be centered over the anchor point on any axis that had no gravity specified.

fn set_constraint_adjustment(
    &mut self,
    object: XdgPositioner,
    constraint_adjustment: u32
)

set the adjustment to be done when constrained

Specify how the window should be positioned if the originally intended position caused the surface to be constrained, meaning at least partially outside positioning boundaries set by the compositor. The adjustment is set by constructing a bitmask describing the adjustment to be made when the surface is constrained on that axis.

If no bit for one axis is set, the compositor will assume that the child surface should not change its position on that axis when constrained.

If more than one bit for one axis is set, the order of how adjustments are applied is specified in the corresponding adjustment descriptions.

The default adjustment is none.

fn set_offset(&mut self, object: XdgPositioner, x: i32, y: i32)

set surface position offset

Specify the surface position offset relative to the position of the anchor on the anchor rectangle and the anchor on the surface. For example if the anchor of the anchor rectangle is at (x, y), the surface has the gravity bottom|right, and the offset is (ox, oy), the calculated surface position will be (x + ox, y + oy). The offset position of the surface is the one used for constraint testing. See set_constraint_adjustment.

An example use case is placing a popup menu on top of a user interface element, while aligning the user interface element of the parent surface with some user interface element placed somewhere in the popup surface.

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Implementors

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