public class KeyguardUserSwitcherScrim extends Drawable implements View.OnLayoutChangeListener
Drawable.Callback, Drawable.ConstantState
Constructor and Description |
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KeyguardUserSwitcherScrim(Context context) |
Modifier and Type | Method and Description |
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void |
draw(Canvas canvas)
Draw in its bounds (set via setBounds) respecting optional effects such
as alpha (set via setAlpha) and color filter (set via setColorFilter).
|
int |
getAlpha()
Gets the current alpha value for the drawable. 0 means fully transparent,
255 means fully opaque.
|
int |
getOpacity()
Return the opacity/transparency of this Drawable.
|
void |
onLayoutChange(View v,
int left,
int top,
int right,
int bottom,
int oldLeft,
int oldTop,
int oldRight,
int oldBottom)
Called when the layout bounds of a view changes due to layout processing.
|
void |
setAlpha(int alpha)
Specify an alpha value for the drawable. 0 means fully transparent, and
255 means fully opaque.
|
void |
setColorFilter(ColorFilter colorFilter)
Specify an optional color filter for the drawable.
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applyTheme, canApplyTheme, clearColorFilter, clearMutated, copyBounds, copyBounds, createFromPath, createFromResourceStream, createFromResourceStream, createFromStream, createFromXml, createFromXml, createFromXmlInner, createFromXmlInner, getBounds, getCallback, getChangingConfigurations, getColorFilter, getConstantState, getCurrent, getDirtyBounds, getHotspotBounds, getIntrinsicHeight, getIntrinsicWidth, getLayoutDirection, getLevel, getMinimumHeight, getMinimumWidth, getOpticalInsets, getOutline, getPadding, getState, getTransparentRegion, inflate, inflate, invalidateSelf, isAutoMirrored, isFilterBitmap, isProjected, isStateful, isVisible, jumpToCurrentState, mutate, obtainAttributes, onBoundsChange, onLayoutDirectionChanged, onLevelChange, onStateChange, parseTintMode, resolveOpacity, scheduleSelf, setAutoMirrored, setBounds, setBounds, setCallback, setChangingConfigurations, setColorFilter, setDither, setFilterBitmap, setHotspot, setHotspotBounds, setLayoutDirection, setLevel, setState, setTint, setTintList, setTintMode, setVisible, setXfermode, unscheduleSelf
public KeyguardUserSwitcherScrim(Context context)
public void draw(Canvas canvas)
Drawable
public void setAlpha(int alpha)
Drawable
public int getAlpha()
Drawable
public void setColorFilter(ColorFilter colorFilter)
Drawable
If a Drawable has a ColorFilter, each output pixel of the Drawable's drawing contents will be modified by the color filter before it is blended onto the render target of a Canvas.
Pass null
to remove any existing color filter.
Note: Setting a non-null
color
filter disables tint
.
setColorFilter
in class Drawable
colorFilter
- The color filter to apply, or null
to remove the
existing color filterpublic int getOpacity()
Drawable
PixelFormat
:
PixelFormat.UNKNOWN
,
PixelFormat.TRANSLUCENT
,
PixelFormat.TRANSPARENT
, or
PixelFormat.OPAQUE
.
An OPAQUE drawable is one that draws all all content within its bounds, completely covering anything behind the drawable. A TRANSPARENT drawable is one that draws nothing within its bounds, allowing everything behind it to show through. A TRANSLUCENT drawable is a drawable in any other state, where the drawable will draw some, but not all, of the content within its bounds and at least some content behind the drawable will be visible. If the visibility of the drawable's contents cannot be determined, the safest/best return value is TRANSLUCENT.
Generally a Drawable should be as conservative as possible with the
value it returns. For example, if it contains multiple child drawables
and only shows one of them at a time, if only one of the children is
TRANSLUCENT and the others are OPAQUE then TRANSLUCENT should be
returned. You can use the method Drawable.resolveOpacity(int, int)
to perform a
standard reduction of two opacities to the appropriate single output.
Note that the returned value does not necessarily take into account a
custom alpha or color filter that has been applied by the client through
the Drawable.setAlpha(int)
or Drawable.setColorFilter(android.graphics.ColorFilter)
methods. Some subclasses,
such as BitmapDrawable
, ColorDrawable
, and GradientDrawable
,
do account for the value of Drawable.setAlpha(int)
, but the general behavior is dependent
upon the implementation of the subclass.
getOpacity
in class Drawable
PixelFormat
public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom)
View.OnLayoutChangeListener
onLayoutChange
in interface View.OnLayoutChangeListener
v
- The view whose bounds have changed.left
- The new value of the view's left property.top
- The new value of the view's top property.right
- The new value of the view's right property.bottom
- The new value of the view's bottom property.oldLeft
- The previous value of the view's left property.oldTop
- The previous value of the view's top property.oldRight
- The previous value of the view's right property.oldBottom
- The previous value of the view's bottom property.