public class ChangeTransform extends Transition
Transition.AnimationInfo, Transition.EpicenterCallback, Transition.TransitionListener, Transition.TransitionListenerAdapter
MATCH_ID, MATCH_INSTANCE, MATCH_ITEM_ID, MATCH_NAME
Constructor and Description |
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ChangeTransform() |
ChangeTransform(Context context,
AttributeSet attrs) |
Modifier and Type | Method and Description |
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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.
|
boolean |
getReparent()
Returns whether parent changes will be tracked by the ChangeTransform.
|
boolean |
getReparentWithOverlay()
Returns whether changes to parent should use an overlay or not.
|
String[] |
getTransitionProperties()
Returns the set of property names used stored in the
TransitionValues
object passed into Transition.captureStartValues(TransitionValues) that
this transition cares about for the purposes of canceling overlapping animations. |
void |
setReparent(boolean reparent)
Sets whether parent changes will be tracked by the ChangeTransform.
|
void |
setReparentWithOverlay(boolean reparentWithOverlay)
Sets whether changes to parent should use an overlay or not.
|
addListener, addTarget, addTarget, addTarget, addTarget, animate, cancel, canRemoveViews, clone, createAnimators, end, excludeChildren, excludeChildren, excludeChildren, excludeTarget, excludeTarget, excludeTarget, excludeTarget, getDuration, getEpicenter, getEpicenterCallback, getInterpolator, getName, getNameOverrides, getPathMotion, getPropagation, getStartDelay, getTargetIds, getTargetNames, getTargets, getTargetTypes, getTargetViewNames, getTransitionValues, isTransitionRequired, pause, removeListener, removeTarget, removeTarget, removeTarget, removeTarget, resume, runAnimators, setDuration, setEpicenterCallback, setInterpolator, setMatchOrder, setNameOverrides, setPathMotion, setPropagation, setStartDelay, start, toString
public ChangeTransform()
public ChangeTransform(Context context, AttributeSet attrs)
public boolean getReparentWithOverlay()
true
.
Note: when Overlays are not used when a parent changes, a view can be clipped when
it moves outside the bounds of its parent. Setting
ViewGroup.setClipChildren(boolean)
and
ViewGroup.setClipToPadding(boolean)
can help. Also, when
Overlays are not used and the parent is animating its location, the position of the
child view will be relative to its parent's final position, so it may appear to "jump"
at the beginning.
true
when a changed parent should execute the transition
inside the scene root's overlay or false
if a parent change only
affects the transform of the transitioning view.public void setReparentWithOverlay(boolean reparentWithOverlay)
true
.
Note: when Overlays are not used when a parent changes, a view can be clipped when
it moves outside the bounds of its parent. Setting
ViewGroup.setClipChildren(boolean)
and
ViewGroup.setClipToPadding(boolean)
can help. Also, when
Overlays are not used and the parent is animating its location, the position of the
child view will be relative to its parent's final position, so it may appear to "jump"
at the beginning.
public boolean getReparent()
public void setReparent(boolean reparent)
reparent
- Set to true to track parent changes or false to only track changes
of the transitioning view without considering the parent change.public String[] getTransitionProperties()
Transition
TransitionValues
object passed into Transition.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.
getTransitionProperties
in class Transition
TransitionValues
. The default implementation returns null
.public void captureStartValues(TransitionValues transitionValues)
Transition
Transition.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
Transition.createAnimator(android.view.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.
captureStartValues
in class Transition
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.Transition.captureEndValues(TransitionValues)
,
Transition.createAnimator(ViewGroup, TransitionValues, TransitionValues)
public void captureEndValues(TransitionValues transitionValues)
Transition
Transition.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
Transition.createAnimator(android.view.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.
captureEndValues
in class Transition
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.Transition.captureStartValues(TransitionValues)
,
Transition.createAnimator(ViewGroup, TransitionValues, TransitionValues)
public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues)
Transition
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 TransitionValues.view
field.
createAnimator
in class Transition
sceneRoot
- The root of the transition hierarchy.startValues
- The values for a specific target in the start scene.endValues
- The values for the target in the end scene.