com.alexvasilkov.gestures.transition.tracker

Class SimpleTracker

java.lang.Object

com.alexvasilkov.gestures.transition.tracker.SimpleTracker

All Implemented Interfaces:

FromTracker<java.lang.Integer>, IntoTracker<java.lang.Integer>

public abstract class SimpleTracker
extends java.lang.Object
implements FromTracker<java.lang.Integer>, IntoTracker<java.lang.Integer>

Class implementing both FromTracker and IntoTracker assuming that positions will be used as items ids.

Note, that it will only work correctly if both "from" and "to" lists are the same and there will be no changes to them which will change existing items' positions. So you can't remove items, or add items into the middle, but you can add new items to the end of the list, as long as both lists are updated simultaneously.

If you need to handle more advanced cases you should manually implement FromTracker and IntoTracker, and use items ids instead of their positions.

Field Summary

Fields

Modifier and Type	Field and Description
static int	NO_POSITION

Constructor Summary

Constructors

Constructor and Description
SimpleTracker()

Method Summary

Modifier and Type	Method and Description
java.lang.Integer	getIdByPosition(int position)
int	getPositionById(java.lang.Integer id)
protected abstract android.view.View	getViewAt(int position)
android.view.View	getViewById(java.lang.Integer id)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NO_POSITION

public static final int NO_POSITION

See Also:

Constant Field Values

Constructor Detail

SimpleTracker

public SimpleTracker()

Method Detail

getIdByPosition

public java.lang.Integer getIdByPosition(int position)

Specified by:

getIdByPosition in interface IntoTracker<java.lang.Integer>

Returns:

Item's id at given position, or null if position is invalid. Note, that only one id per position should be possible for "To" view.

getPositionById

public int getPositionById(java.lang.Integer id)

Returns:

Position of list item which contains element with given ID, or NO_POSITION if element with given ID is not part of the list.
Note, that there can be several elements inside single list item, but we only need to know list item position, so we can scroll to it if required.

getViewById

public android.view.View getViewById(java.lang.Integer id)

Returns:

View for given element ID, or null if view is not found.
Note, that it is safe to return null if view is not found on the screen, list view will be automatically scrolled to needed position (as returned by getPositionById(Object)) and this method will be called again.

getViewAt

protected abstract android.view.View getViewAt(int position)