skiko/org.jetbrains.skia/Drawable

Drawable

Base class for objects that draw into Canvas.

The object has a generation id, which is guaranteed to be unique across all drawables. To allow for clients of the drawable that may want to cache the results, the drawable must change its generation id whenever its internal state changes such that it will draw differently.

Constructors

Drawable

constructor()

Types

Companion

object Companion

Properties

bounds

val bounds: Rect

Return the (conservative) bounds of what the drawable will draw. If the drawable can change what it draws (e.g. animation or in response to some external change), then this must return a bounds that is always valid for all possible states.

generationId

val generationId: Int

Return a unique value for this instance. If two calls to this return the same value, it is presumed that calling the draw() method will render the same thing as well.

isClosed

expect open val isClosed: Boolean

Check if underlying resource is closed.

Functions

expect open fun close()

Free underlying native resource, peer is useless afterwards.

draw

fun draw(canvas: Canvas?): Drawable

fun draw(canvas: Canvas?, matrix: Matrix33?): Drawable

fun draw(canvas: Canvas?, x: Float, y: Float): Drawable

Draws into the specified content. The drawing sequence will be balanced upon return (i.e. the saveLevel() on the canvas will match what it was when draw() was called, and the current matrix and clip settings will not be changed.

makePictureSnapshot

fun makePictureSnapshot(): Picture

notifyDrawingChanged

fun notifyDrawingChanged(): Drawable

Calling this invalidates the previous generation ID, and causes a new one to be computed the next time getGenerationId() is called. Typically this is called by the object itself, in response to its internal state changing.

onDraw

abstract fun onDraw(canvas: Canvas?)

onGetBounds

abstract fun onGetBounds(): Rect

toString

expect open override fun toString(): String