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public
abstract
class
ViewOutlineProvider
extends Object
java.lang.Object | |
↳ | android.view.ViewOutlineProvider |
Interface by which a View builds its Outline
, used for shadow casting and clipping.
Fields | |
---|---|
public
static
final
ViewOutlineProvider |
BACKGROUND
Default outline provider for Views, which queries the Outline from the View's background, or generates a 0 alpha, rectangular Outline the size of the View if a background isn't present. |
public
static
final
ViewOutlineProvider |
BOUNDS
Maintains the outline of the View to match its rectangular bounds,
at |
public
static
final
ViewOutlineProvider |
PADDED_BOUNDS
Maintains the outline of the View to match its rectangular padded bounds,
at |
Public constructors | |
---|---|
ViewOutlineProvider()
|
Public methods | |
---|---|
abstract
void
|
getOutline(View view, Outline outline)
Called to get the provider to populate the Outline. |
Inherited methods | |
---|---|
public static final ViewOutlineProvider BACKGROUND
Default outline provider for Views, which queries the Outline from the View's background, or generates a 0 alpha, rectangular Outline the size of the View if a background isn't present.
See also:
public static final ViewOutlineProvider BOUNDS
Maintains the outline of the View to match its rectangular bounds,
at 1.0f
alpha.
This can be used to enable Views that are opaque but lacking a background cast a shadow.
public static final ViewOutlineProvider PADDED_BOUNDS
Maintains the outline of the View to match its rectangular padded bounds,
at 1.0f
alpha.
This can be used to enable Views that are opaque but lacking a background cast a shadow.
public ViewOutlineProvider ()
public abstract void getOutline (View view, Outline outline)
Called to get the provider to populate the Outline.
This method will be called by a View when its owned Drawables are invalidated, when the
View's size changes, or if View#invalidateOutline()
is called
explicitly.
The input outline is empty and has an alpha of 1.0f
.
Parameters | |
---|---|
view |
View : The view building the outline. |
outline |
Outline : The empty outline to be populated. |