Enum cacao::layout::LayoutAttribute

source · [−]

pub enum LayoutAttribute {
Show 14 variants    Left,
    Right,
    Top,
    Bottom,
    Leading,
    Trailing,
    Width,
    Height,
    CenterX,
    CenterY,
    LastBaseline,
    FirstBaseline,
    NotAnAttribute,
    Unknown(NSInteger),
}

Expand description

Represents attributes for various layouts and constraints.

Note that this only covers attributes that are shared across platforms. In general, this is enough to build apps that work everywhere - but if you need to specify something else, you can handle it yourself with the Unknown variant.

Variants

`Left`

The left side of the object’s alignment rectangle.

`Right`

The right side of the object’s alignment rectangle.

`Top`

The top of the object’s alignment rectangle.

`Bottom`

The bottom of the object’s alignment rectangle.

`Leading`

The leading edge of the object’s alignment rectangle.

`Trailing`

The trailing edge of the object’s alignment rectangle.

`Width`

The width of the object’s alignment rectangle.

`Height`

The height of the object’s alignment rectangle.

`CenterX`

The center along the x-axis of the object’s alignment rectangle.

`CenterY`

The center along the y-axis of the object’s alignment rectangle.

`LastBaseline`

The object’s baseline. For objects with more than one line of text, this is the baseline for the bottommost line of text.

`FirstBaseline`

The object’s baseline. For objects with more than one line of text, this is the baseline for the topmost line of text.

`NotAnAttribute`

A placeholder value that is used to indicate that the constraint’s second item and second attribute are not used in any calculations.

This can be useful constraint that assigns a constant to an attribute.

`Unknown(NSInteger)`

Represents an unknown value. This should never be constructed, but acts as a guard against a change in representation on the framework side. If a new value was ever introduced, it’s caught here, and applications can handle it themselves if need be.