belongs to Maven artifact com.android.support:transition:28.0.0-alpha1
Visibility
public
abstract
class
Visibility
extends Transition
java.lang.Object | ||
↳ | android.support.transition.Transition | |
↳ | android.support.transition.Visibility |
Known Direct Subclasses |
This transition tracks changes to the visibility of target views in the
start and end scenes. Visibility is determined not just by the
setVisibility(int)
state of views, but also whether
views exist in the current view hierarchy. The class is intended to be a
utility for subclasses such as Fade
, which use this visibility
information to determine the specific animations to run when visibility
changes occur. Subclasses should implement one or both of the methods
onAppear(ViewGroup, TransitionValues, int, TransitionValues, int)
,
onDisappear(ViewGroup, TransitionValues, int, TransitionValues, int)
or
onAppear(ViewGroup, View, TransitionValues, TransitionValues)
,
onDisappear(ViewGroup, View, TransitionValues, TransitionValues)
.
Summary
Constants | |
---|---|
int |
MODE_IN
Mode used in |
int |
MODE_OUT
Mode used in |
Inherited constants |
---|
From
class
android.support.transition.Transition
|
Public constructors | |
---|---|
Visibility()
|
|
Visibility(Context context, AttributeSet attrs)
|
Public methods | |
---|---|
void
|
captureEndValues(TransitionValues transitionValues)
Captures the values in the end scene for the properties that this transition monitors. |
void
|
captureStartValues(TransitionValues transitionValues)
Captures the values in the start scene for the properties that this transition monitors. |
Animator
|
createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues)
This method creates an animation that will be run for this transition given the information in the startValues and endValues structures captured earlier for the start and end scenes. |
int
|
getMode()
Returns whether appearing and/or disappearing Views are supported. |
String[]
|
getTransitionProperties()
Returns the set of property names used stored in the |
boolean
|
isTransitionRequired(TransitionValues startValues, TransitionValues newValues)
Returns whether or not the transition should create an Animator, based on the values
captured during |
boolean
|
isVisible(TransitionValues values)
Returns whether the view is 'visible' according to the given values object. |
Animator
|
onAppear(ViewGroup sceneRoot, TransitionValues startValues, int startVisibility, TransitionValues endValues, int endVisibility)
The default implementation of this method does nothing. |
Animator
|
onAppear(ViewGroup sceneRoot, View view, TransitionValues startValues, TransitionValues endValues)
The default implementation of this method returns a null Animator. |
Animator
|
onDisappear(ViewGroup sceneRoot, TransitionValues startValues, int startVisibility, TransitionValues endValues, int endVisibility)
The default implementation of this method does nothing. |
Animator
|
onDisappear(ViewGroup sceneRoot, View view, TransitionValues startValues, TransitionValues endValues)
The default implementation of this method returns a null Animator. |
void
|
setMode(int mode)
Changes the transition to support appearing and/or disappearing Views, depending
on |
Inherited methods | |
---|---|
From
class
android.support.transition.Transition
| |
From
class
java.lang.Object
|
Constants
MODE_IN
int MODE_IN
Mode used in setMode(int)
to make the transition
operate on targets that are appearing. Maybe be combined with
MODE_OUT
to target Visibility changes both in and out.
Constant Value: 1 (0x00000001)
MODE_OUT
int MODE_OUT
Mode used in setMode(int)
to make the transition
operate on targets that are disappearing. Maybe be combined with
MODE_IN
to target Visibility changes both in and out.
Constant Value: 2 (0x00000002)
Public constructors
Visibility
Visibility (Context context, AttributeSet attrs)
Parameters | |
---|---|
context |
Context |
attrs |
AttributeSet |
Public methods
captureEndValues
void captureEndValues (TransitionValues transitionValues)
Captures the values in the end scene for the properties that this
transition monitors. These values are then passed as the endValues
structure in a later call to
createAnimator(ViewGroup, TransitionValues, TransitionValues)
.
The main concern for an implementation is what the
properties are that the transition cares about and what the values are
for all of those properties. The start and end values will be compared
later during the
createAnimator(ViewGroup, TransitionValues, TransitionValues)
method to determine what, if any, animations, should be run.
Subclasses must implement this method. The method should only be called by the transition system; it is not intended to be called from external classes.
Parameters | |
---|---|
transitionValues |
TransitionValues : The holder for any values that the Transition
wishes to store. Values are stored in the values field
of this TransitionValues object and are keyed from
a String value. For example, to store a view's rotation value,
a transition might call
transitionValues.values.put("appname:transitionname:rotation",
view.getRotation()) . The target view will already be stored
in
the transitionValues structure when this method is called. |
captureStartValues
void captureStartValues (TransitionValues transitionValues)
Captures the values in the start scene for the properties that this
transition monitors. These values are then passed as the startValues
structure in a later call to
createAnimator(ViewGroup, TransitionValues, TransitionValues)
.
The main concern for an implementation is what the
properties are that the transition cares about and what the values are
for all of those properties. The start and end values will be compared
later during the
createAnimator(ViewGroup, TransitionValues, TransitionValues)
method to determine what, if any, animations, should be run.
Subclasses must implement this method. The method should only be called by the transition system; it is not intended to be called from external classes.
Parameters | |
---|---|
transitionValues |
TransitionValues : The holder for any values that the Transition
wishes to store. Values are stored in the values field
of this TransitionValues object and are keyed from
a String value. For example, to store a view's rotation value,
a transition might call
transitionValues.values.put("appname:transitionname:rotation",
view.getRotation()) . The target view will already be stored
in
the transitionValues structure when this method is called. |
createAnimator
Animator createAnimator (ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues)
This method creates an animation that will be run for this transition given the information in the startValues and endValues structures captured earlier for the start and end scenes. Subclasses of Transition should override this method. The method should only be called by the transition system; it is not intended to be called from external classes.
This method is called by the transition's parent (all the way up to the
topmost Transition in the hierarchy) with the sceneRoot and start/end
values that the transition may need to set up initial target values
and construct an appropriate animation. For example, if an overall
Transition is a TransitionSet
consisting of several
child transitions in sequence, then some of the child transitions may
want to set initial values on target views prior to the overall
Transition commencing, to put them in an appropriate state for the
delay between that start and the child Transition start time. For
example, a transition that fades an item in may wish to set the starting
alpha value to 0, to avoid it blinking in prior to the transition
actually starting the animation. This is necessary because the scene
change that triggers the Transition will automatically set the end-scene
on all target views, so a Transition that wants to animate from a
different value should set that value prior to returning from this method.
Additionally, a Transition can perform logic to determine whether the transition needs to run on the given target and start/end values. For example, a transition that resizes objects on the screen may wish to avoid running for views which are not present in either the start or end scenes.
If there is an animator created and returned from this method, the
transition mechanism will apply any applicable duration, startDelay,
and interpolator to that animation and start it. A return value of
null
indicates that no animation should run. The default
implementation returns null.
The method is called for every applicable target object, which is
stored in the view
field.
Parameters | |
---|---|
sceneRoot |
ViewGroup : The root of the transition hierarchy. |
startValues |
TransitionValues : The values for a specific target in the start scene. |
endValues |
TransitionValues : The values for the target in the end scene. |
Returns | |
---|---|
Animator |
A Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run. |
getMode
int getMode ()
Returns whether appearing and/or disappearing Views are supported.
Returns | |
---|---|
int |
whether appearing and/or disappearing Views are supported. A combination of
MODE_IN and MODE_OUT .
|
getTransitionProperties
String[] getTransitionProperties ()
Returns the set of property names used stored in the TransitionValues
object passed into captureStartValues(TransitionValues)
that
this transition cares about for the purposes of canceling overlapping animations.
When any transition is started on a given scene root, all transitions
currently running on that same scene root are checked to see whether the
properties on which they based their animations agree with the end values of
the same properties in the new transition. If the end values are not equal,
then the old animation is canceled since the new transition will start a new
animation to these new values. If the values are equal, the old animation is
allowed to continue and no new animation is started for that transition.
A transition does not need to override this method. However, not doing so will mean that the cancellation logic outlined in the previous paragraph will be skipped for that transition, possibly leading to artifacts as old transitions and new transitions on the same targets run in parallel, animating views toward potentially different end values.
Returns | |
---|---|
String[] |
An array of property names as described in the class documentation for
TransitionValues . The default implementation returns null .
|
isTransitionRequired
boolean isTransitionRequired (TransitionValues startValues, TransitionValues newValues)
Returns whether or not the transition should create an Animator, based on the values
captured during captureStartValues(TransitionValues)
and
captureEndValues(TransitionValues)
. The default implementation compares the
property values returned from getTransitionProperties()
, or all property values if
getTransitionProperties()
returns null. Subclasses may override this method to
provide logic more specific to the transition implementation.
Parameters | |
---|---|
startValues |
TransitionValues : the values from captureStartValues, This may be null if the
View did not exist in the start state. |
newValues |
TransitionValues : the values from captureEndValues. This may be null if the View
did not exist in the end state.
|
Returns | |
---|---|
boolean |
isVisible
boolean isVisible (TransitionValues values)
Returns whether the view is 'visible' according to the given values
object. This is determined by testing the same properties in the values
object that are used to determine whether the object is appearing or
disappearing in the createAnimator(ViewGroup, TransitionValues, TransitionValues)
method. This method can be called by, for example, subclasses that want
to know whether the object is visible in the same way that Visibility
determines it for the actual animation.
Parameters | |
---|---|
values |
TransitionValues : The TransitionValues object that holds the information by
which visibility is determined. |
Returns | |
---|---|
boolean |
True if the view reference by values is visible,
false otherwise.
|
onAppear
Animator onAppear (ViewGroup sceneRoot, TransitionValues startValues, int startVisibility, TransitionValues endValues, int endVisibility)
The default implementation of this method does nothing. Subclasses should override if they need to create an Animator when targets appear. The method should only be called by the Visibility class; it is not intended to be called from external classes.
Parameters | |
---|---|
sceneRoot |
ViewGroup : The root of the transition hierarchy |
startValues |
TransitionValues : The target values in the start scene |
startVisibility |
int : The target visibility in the start scene |
endValues |
TransitionValues : The target values in the end scene |
endVisibility |
int : The target visibility in the end scene |
Returns | |
---|---|
Animator |
An Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run. |
onAppear
Animator onAppear (ViewGroup sceneRoot, View view, TransitionValues startValues, TransitionValues endValues)
The default implementation of this method returns a null Animator. Subclasses should
override this method to make targets appear with the desired transition. The
method should only be called from
onAppear(ViewGroup, TransitionValues, int, TransitionValues, int)
.
Parameters | |
---|---|
sceneRoot |
ViewGroup : The root of the transition hierarchy |
view |
View : The View to make appear. This will be in the target scene's View
hierarchy
and
will be VISIBLE. |
startValues |
TransitionValues : The target values in the start scene |
endValues |
TransitionValues : The target values in the end scene |
Returns | |
---|---|
Animator |
An Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run. |
onDisappear
Animator onDisappear (ViewGroup sceneRoot, TransitionValues startValues, int startVisibility, TransitionValues endValues, int endVisibility)
The default implementation of this method does nothing. Subclasses should override if they need to create an Animator when targets disappear. The method should only be called by the Visibility class; it is not intended to be called from external classes.
Parameters | |
---|---|
sceneRoot |
ViewGroup : The root of the transition hierarchy |
startValues |
TransitionValues : The target values in the start scene |
startVisibility |
int : The target visibility in the start scene |
endValues |
TransitionValues : The target values in the end scene |
endVisibility |
int : The target visibility in the end scene |
Returns | |
---|---|
Animator |
An Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run. |
onDisappear
Animator onDisappear (ViewGroup sceneRoot, View view, TransitionValues startValues, TransitionValues endValues)
The default implementation of this method returns a null Animator. Subclasses should
override this method to make targets disappear with the desired transition. The
method should only be called from
onDisappear(ViewGroup, TransitionValues, int, TransitionValues, int)
.
Parameters | |
---|---|
sceneRoot |
ViewGroup : The root of the transition hierarchy |
view |
View : The View to make disappear. This will be in the target scene's View
hierarchy or in an ViewGroupOverlay and will be
VISIBLE. |
startValues |
TransitionValues : The target values in the start scene |
endValues |
TransitionValues : The target values in the end scene |
Returns | |
---|---|
Animator |
An Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run. |
setMode
void setMode (int mode)
Changes the transition to support appearing and/or disappearing Views, depending
on mode
.
Parameters | |
---|---|
mode |
int : The behavior supported by this transition, a combination of
MODE_IN and MODE_OUT .
|
Interfaces
Classes
- ArcMotion
- AutoTransition
- ChangeBounds
- ChangeClipBounds
- ChangeImageTransform
- ChangeScroll
- ChangeTransform
- CircularPropagation
- Explode
- Fade
- PathMotion
- PatternPathMotion
- R
- R.attr
- R.bool
- R.color
- R.dimen
- R.drawable
- R.id
- R.integer
- R.layout
- R.string
- R.style
- R.styleable
- Scene
- SidePropagation
- Slide
- Transition
- Transition.EpicenterCallback
- TransitionInflater
- TransitionListenerAdapter
- TransitionManager
- TransitionPropagation
- TransitionSet
- TransitionValues
- Visibility
- VisibilityPropagation