Trait components::ContentExt[−][src]

pub trait ContentExt: 'static {
    pub fn get_preferred_size(&self) -> Option<(f32, f32)>;

    pub fn invalidate(&self);

    pub fn connect_attached<F>(&self, f: F) -> SignalHandlerId
    where
        F: 'static + Fn(&Self, &Actor);

    pub fn connect_detached<F>(&self, f: F) -> SignalHandlerId
    where
        F: 'static + Fn(&Self, &Actor);
}

Trait containing all Content methods.

Implementors

Canvas, Content, Image

Required methods

pub fn get_preferred_size(&self) -> Option<(f32, f32)>[src]

Retrieves the natural size of the self, if any.

The natural size of a Content is defined as the size the content would have regardless of the allocation of the actor that is painting it, for instance the size of an image data.

width

return location for the natural width of the content

height

return location for the natural height of the content

Returns

true if the content has a preferred size, and false otherwise

pub fn invalidate(&self)[src]

Invalidates a Content.

This function should be called by Content implementations when they change the way a the content should be painted regardless of the actor state.

pub fn connect_attached<F>(&self, f: F) -> SignalHandlerId where
    F: 'static + Fn(&Self, &Actor), [src]

This signal is emitted each time a Content implementation is assigned to a Actor.

actor

a Actor

pub fn connect_detached<F>(&self, f: F) -> SignalHandlerId where
    F: 'static + Fn(&Self, &Actor), [src]

This signal is emitted each time a Content implementation is removed from a Actor.

actor

a Actor

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Implementors

impl<O> ContentExt for O where
    O: IsA<Content>, [src]

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