Added option to swipe a view at given position. Fixes #17

Author: nhaarman

library/src/com/haarman/listviewanimations/itemmanipulation/contextualundo/ContextualUndoAdapter.java

@@ -35,7 +35,9 @@
 
 import com.haarman.listviewanimations.BaseAdapterDecorator;
 import com.nineoldandroids.animation.Animator;
+import com.nineoldandroids.animation.Animator.AnimatorListener;
 import com.nineoldandroids.animation.AnimatorListenerAdapter;
+import com.nineoldandroids.animation.ObjectAnimator;
 import com.nineoldandroids.animation.ValueAnimator;
 import com.nineoldandroids.view.ViewHelper;
 
@@ -251,6 +253,44 @@ public void onRestoreInstanceState(Bundle savedInstanceState) {
 		mCurrentRemovedId = savedInstanceState.getLong(EXTRA_ACTIVE_REMOVED_ID, -1);
 	}
 
+	/**
+	 * Animate the item at given position away and show the undo {@link View}.
+	 * @param position the position.
+	 */
+	public void swipeViewAtPosition(int position) {
+		mCurrentRemovedId = getItemId(position);
+		for (int i = 0; i < getAbsListView().getChildCount(); i++) {
+			int positionForView = getAbsListView().getPositionForView(getAbsListView().getChildAt(i));
+			if (positionForView == position) {
+				swipeView(getAbsListView().getChildAt(i), positionForView);
+			}
+		}
+	}
+
+	private void swipeView(final View view, final int dismissPosition) {
+		ObjectAnimator animator = ObjectAnimator.ofFloat(view, "x", view.getMeasuredWidth());
+		animator.addListener(new AnimatorListener() {
+
+			@Override
+			public void onAnimationStart(Animator animator) {
+			}
+
+			@Override
+			public void onAnimationRepeat(Animator animator) {
+			}
+
+			@Override
+			public void onAnimationEnd(Animator animator) {
+				onViewSwiped(view, dismissPosition);
+			}
+
+			@Override
+			public void onAnimationCancel(Animator animator) {
+			}
+		});
+		animator.start();
+	}
+
 	/**	
 	 * A callback interface which is used to notify when items should be removed from the collection.
 	 */