private boolean handleRowTouch(View view, MotionEvent event) {
int action = event.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = event.getPointerId(0);
mLastDownXlat = view.getTranslationX();
mLastDraggingView = view;
mLastDownX = event.getRawX();
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(event);
int idx = mViews.indexOf(mLastDraggingView);
mSpringChain.setControlSpringIndex(idx);
mSpringChain.getControlSpring().setCurrentValue(mLastDownXlat);
break;
case MotionEvent.ACTION_MOVE:
{
final int pointerIndex = event.findPointerIndex(mActivePointerId);
if (pointerIndex != -1) {
final int location[] = {0, 0};
view.getLocationOnScreen(location);
float x = event.getX(pointerIndex) + location[0];
float offset = x - mLastDownX + mLastDownXlat;
mSpringChain.getControlSpring().setCurrentValue(offset);
mVelocityTracker.addMovement(event);
}
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
final int pointerIndex = event.findPointerIndex(mActivePointerId);
if (pointerIndex != -1) {
mVelocityTracker.addMovement(event);
mVelocityTracker.computeCurrentVelocity(1000);
mSpringChain
.getControlSpring()
.setVelocity(mVelocityTracker.getXVelocity())
.setEndValue(0);
}
break;
}
return true;
}
public CascadeEffectExample(Context context) {
super(context);
LayoutInflater inflater = LayoutInflater.from(context);
ViewGroup container = (ViewGroup) inflater.inflate(R.layout.cascade_effect, this, false);
addView(container);
ViewGroup rootView = (ViewGroup) container.findViewById(R.id.root);
int bgColor = Color.argb(255, 17, 148, 231);
rootView.setBackgroundColor(bgColor);
int startColor = Color.argb(255, 255, 64, 230);
int endColor = Color.argb(255, 255, 230, 64);
ArgbEvaluator evaluator = new ArgbEvaluator();
int viewCount = 10;
for (int i = 0; i < viewCount; i++) {
final View view = new View(context);
view.setLayoutParams(
new TableLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1f));
mSpringChain.addSpring(
new SimpleSpringListener() {
@Override
public void onSpringUpdate(Spring spring) {
float value = (float) spring.getCurrentValue();
view.setTranslationX(value);
}
});
int color = (Integer) evaluator.evaluate((float) i / (float) viewCount, startColor, endColor);
view.setBackgroundColor(color);
view.setOnTouchListener(
new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return handleRowTouch(v, event);
}
});
mViews.add(view);
rootView.addView(view);
}
getViewTreeObserver()
.addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
getViewTreeObserver().removeOnGlobalLayoutListener(this);
List<Spring> springs = mSpringChain.getAllSprings();
for (int i = 0; i < springs.size(); i++) {
springs.get(i).setCurrentValue(-mViews.get(i).getWidth());
}
postDelayed(
new Runnable() {
@Override
public void run() {
mSpringChain.setControlSpringIndex(0).getControlSpring().setEndValue(0);
}
},
500);
}
});
}
public class CascadeEffectExample extends FrameLayout {
private final SpringChain mSpringChain = SpringChain.create();
private final List<View> mViews = new ArrayList<View>();
private float mLastDownX;
/** Touch handling * */
private View mLastDraggingView;
private float mLastDownXlat;
private int mActivePointerId;
private VelocityTracker mVelocityTracker;
public CascadeEffectExample(Context context) {
super(context);
LayoutInflater inflater = LayoutInflater.from(context);
ViewGroup container = (ViewGroup) inflater.inflate(R.layout.cascade_effect, this, false);
addView(container);
ViewGroup rootView = (ViewGroup) container.findViewById(R.id.root);
int bgColor = Color.argb(255, 17, 148, 231);
rootView.setBackgroundColor(bgColor);
int startColor = Color.argb(255, 255, 64, 230);
int endColor = Color.argb(255, 255, 230, 64);
ArgbEvaluator evaluator = new ArgbEvaluator();
int viewCount = 10;
for (int i = 0; i < viewCount; i++) {
final View view = new View(context);
view.setLayoutParams(
new TableLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1f));
mSpringChain.addSpring(
new SimpleSpringListener() {
@Override
public void onSpringUpdate(Spring spring) {
float value = (float) spring.getCurrentValue();
view.setTranslationX(value);
}
});
int color = (Integer) evaluator.evaluate((float) i / (float) viewCount, startColor, endColor);
view.setBackgroundColor(color);
view.setOnTouchListener(
new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return handleRowTouch(v, event);
}
});
mViews.add(view);
rootView.addView(view);
}
getViewTreeObserver()
.addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
getViewTreeObserver().removeOnGlobalLayoutListener(this);
List<Spring> springs = mSpringChain.getAllSprings();
for (int i = 0; i < springs.size(); i++) {
springs.get(i).setCurrentValue(-mViews.get(i).getWidth());
}
postDelayed(
new Runnable() {
@Override
public void run() {
mSpringChain.setControlSpringIndex(0).getControlSpring().setEndValue(0);
}
},
500);
}
});
}
private boolean handleRowTouch(View view, MotionEvent event) {
int action = event.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = event.getPointerId(0);
mLastDownXlat = view.getTranslationX();
mLastDraggingView = view;
mLastDownX = event.getRawX();
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(event);
int idx = mViews.indexOf(mLastDraggingView);
mSpringChain.setControlSpringIndex(idx);
mSpringChain.getControlSpring().setCurrentValue(mLastDownXlat);
break;
case MotionEvent.ACTION_MOVE:
{
final int pointerIndex = event.findPointerIndex(mActivePointerId);
if (pointerIndex != -1) {
final int location[] = {0, 0};
view.getLocationOnScreen(location);
float x = event.getX(pointerIndex) + location[0];
float offset = x - mLastDownX + mLastDownXlat;
mSpringChain.getControlSpring().setCurrentValue(offset);
mVelocityTracker.addMovement(event);
}
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
final int pointerIndex = event.findPointerIndex(mActivePointerId);
if (pointerIndex != -1) {
mVelocityTracker.addMovement(event);
mVelocityTracker.computeCurrentVelocity(1000);
mSpringChain
.getControlSpring()
.setVelocity(mVelocityTracker.getXVelocity())
.setEndValue(0);
}
break;
}
return true;
}
}
