AnimationBackend
implements AnimationInformation| com.facebook.fresco.animation.backend.AnimationBackend |
 Known Indirect Subclasses
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Class Overview
Animation backend interface that is used to draw frames.
Summary
| Constants | |||||||||||
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| int | INTRINSIC_DIMENSION_UNSET | Default value if the intrinsic dimensions are not set. | |||||||||
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Inherited Constants | |||||||||||
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From interface
com.facebook.fresco.animation.backend.AnimationInformation
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| Public Methods | |||||||||||
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| abstract void |
clear()
Clean up animation data.
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| abstract boolean |
drawFrame(Drawable parent, Canvas canvas, int frameNumber)
Draw the frame for the given frame number on the canvas.
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| abstract int |
getIntrinsicHeight()
Get the intrinsic height of the underlying animation or
INTRINSIC_DIMENSION_UNSET if
not available. | ||||||||||
| abstract int |
getIntrinsicWidth()
Get the intrinsic width of the underlying animation or
INTRINSIC_DIMENSION_UNSET if
not available. | ||||||||||
| abstract int |
getSizeInBytes()
Get the size of the animation backend.
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| abstract void |
setAlpha(int alpha)
Set the alpha value to be used for drawing frames in
drawFrame(Drawable, Canvas, int)
if supported. | ||||||||||
| abstract void |
setBounds(Rect bounds)
Called when the bounds of the parent drawable are updated.
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| abstract void |
setColorFilter(ColorFilter colorFilter)
The color filter to be used for drawing frames in
drawFrame(Drawable, Canvas, int) if
supported. | ||||||||||
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Inherited Methods | |||||||||||
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From interface
com.facebook.fresco.animation.backend.AnimationInformation
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Constants
public static final int INTRINSIC_DIMENSION_UNSET
Default value if the intrinsic dimensions are not set.
Public Methods
public abstract void clear ()
Clean up animation data. This will be called when the backing drawable is cleared as well. For example, drop all cached frames.
public abstract boolean drawFrame (Drawable parent, Canvas canvas, int frameNumber)
Draw the frame for the given frame number on the canvas.
Parameters
| parent | the parent that draws the frame |
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| canvas | the canvas to draw an |
| frameNumber | the frame number of the frame to draw |
Returns
- true if successful, false if the frame could not be rendered
public abstract int getIntrinsicHeight ()
Get the intrinsic height of the underlying animation or INTRINSIC_DIMENSION_UNSET if
not available.
This value is used by the underlying drawable for aspect ratio computations, similar to
getIntrinsicHeight().
Returns
- the height or
INTRINSIC_DIMENSION_UNSETif unset
public abstract int getIntrinsicWidth ()
Get the intrinsic width of the underlying animation or INTRINSIC_DIMENSION_UNSET if
not available.
This value is used by the underlying drawable for aspect ratio computations, similar to
getIntrinsicWidth().
Returns
- the width or
INTRINSIC_DIMENSION_UNSETif unset
public abstract int getSizeInBytes ()
Get the size of the animation backend.
Returns
- the size in bytes
public abstract void setAlpha (int alpha)
Set the alpha value to be used for drawing frames in drawFrame(Drawable, Canvas, int)
if supported.
Parameters
| alpha | the alpha value between 0 and 255 |
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public abstract void setBounds (Rect bounds)
Called when the bounds of the parent drawable are updated. This can be used to perform some ahead-of-time computations if needed.
The supplied bounds do not have to be stored. It is possible to just use getBounds() of the parent drawable of drawFrame(Drawable, Canvas, int)
instead.
Parameters
| bounds | the bounds to be used for drawing frames |
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public abstract void setColorFilter (ColorFilter colorFilter)
The color filter to be used for drawing frames in drawFrame(Drawable, Canvas, int) if
supported.
Parameters
| colorFilter | the color filter to use |
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