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/* * Copyright 2012 Roman Nurik//from w ww . j a va2 s. co m * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package de.skubware.opentraining.activity.start_training; import android.view.MotionEvent; import android.view.VelocityTracker; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import com.nineoldandroids.animation.Animator; import com.nineoldandroids.animation.AnimatorListenerAdapter; import com.nineoldandroids.animation.ValueAnimator; import static com.nineoldandroids.view.ViewHelper.setAlpha; import static com.nineoldandroids.view.ViewHelper.setTranslationX; import static com.nineoldandroids.view.ViewPropertyAnimator.animate; /** * A {@link android.view.View.OnTouchListener} that makes any {@link View} dismissable when the * user swipes (drags her finger) horizontally across the view. * * <p><em>For {@link android.widget.ListView} list items that don't manage their own touch events * (i.e. you're using * {@link android.widget.ListView#setOnItemClickListener(android.widget.AdapterView.OnItemClickListener)} * or an equivalent listener on {@link android.app.ListActivity} or * {@link android.app.ListFragment}, use {@link SwipeDismissListViewTouchListener} instead.</em></p> * * <p>Example usage:</p> * * <pre> * view.setOnTouchListener(new SwipeDismissTouchListener( * view, * null, // Optional token/cookie object * new SwipeDismissTouchListener.OnDismissCallback() { * public void onDismiss(View view, Object token) { * parent.removeView(view); * } * })); * </pre> * * <p>This class Requires API level 12 or later due to use of {@link * android.view.ViewPropertyAnimator}.</p> * * @see SwipeDismissListViewTouchListener */ public class SwipeDismissTouchListener implements View.OnTouchListener { // Cached ViewConfiguration and system-wide constant values private int mSlop; private int mMinFlingVelocity; private int mMaxFlingVelocity; private long mAnimationTime; // Fixed properties private View mView; private OnDismissCallback mCallback; private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero // Transient properties private float mDownX; private boolean mSwiping; private Object mToken; private VelocityTracker mVelocityTracker; private float mTranslationX; /** * The callback interface used by {@link SwipeDismissTouchListener} to inform its client * about a successful dismissal of the view for which it was created. */ public interface OnDismissCallback { /** * Called when the user has indicated they she would like to dismiss the view. * * @param view The originating {@link View} to be dismissed. * @param token The optional token passed to this object's constructor. */ void onDismiss(View view, Object token); } /** * Constructs a new swipe-to-dismiss touch listener for the given view. * * @param view The view to make dismissable. * @param token An optional token/cookie object to be passed through to the callback. * @param callback The callback to trigger when the user has indicated that she would like to * dismiss this view. */ public SwipeDismissTouchListener(View view, Object token, OnDismissCallback callback) { ViewConfiguration vc = ViewConfiguration.get(view.getContext()); mSlop = vc.getScaledTouchSlop(); mMinFlingVelocity = vc.getScaledMinimumFlingVelocity(); mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity(); mAnimationTime = view.getContext().getResources().getInteger( android.R.integer.config_shortAnimTime); mView = view; mToken = token; mCallback = callback; } @Override public boolean onTouch(View view, MotionEvent motionEvent) { // offset because the view is translated during swipe motionEvent.offsetLocation(mTranslationX, 0); if (mViewWidth < 2) { mViewWidth = mView.getWidth(); } switch (motionEvent.getActionMasked()) { case MotionEvent.ACTION_DOWN: { // TODO: ensure this is a finger, and set a flag mDownX = motionEvent.getRawX(); mVelocityTracker = VelocityTracker.obtain(); mVelocityTracker.addMovement(motionEvent); view.onTouchEvent(motionEvent); return false; } case MotionEvent.ACTION_UP: { if (mVelocityTracker == null) { break; } float deltaX = motionEvent.getRawX() - mDownX; mVelocityTracker.addMovement(motionEvent); mVelocityTracker.computeCurrentVelocity(1000); float velocityX = Math.abs(mVelocityTracker.getXVelocity()); float velocityY = Math.abs(mVelocityTracker.getYVelocity()); boolean dismiss = false; boolean dismissRight = false; if (Math.abs(deltaX) > mViewWidth / 2) { dismiss = true; dismissRight = deltaX > 0; } else if (mMinFlingVelocity <= velocityX && velocityX <= mMaxFlingVelocity && velocityY < velocityX) { dismiss = true; dismissRight = mVelocityTracker.getXVelocity() > 0; } if (dismiss) { // dismiss animate(mView) .translationX(dismissRight ? mViewWidth : -mViewWidth) .alpha(0) .setDuration(mAnimationTime) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { performDismiss(); } }); } else { // cancel animate(mView) .translationX(0) .alpha(1) .setDuration(mAnimationTime) .setListener(null); } mVelocityTracker = null; mTranslationX = 0; mDownX = 0; mSwiping = false; break; } case MotionEvent.ACTION_MOVE: { if (mVelocityTracker == null) { break; } mVelocityTracker.addMovement(motionEvent); float deltaX = motionEvent.getRawX() - mDownX; if (Math.abs(deltaX) > mSlop) { mSwiping = true; mView.getParent().requestDisallowInterceptTouchEvent(true); // Cancel listview's touch MotionEvent cancelEvent = MotionEvent.obtain(motionEvent); cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); mView.onTouchEvent(cancelEvent); } if (mSwiping) { mTranslationX = deltaX; setTranslationX(mView, deltaX); // TODO: use an ease-out interpolator or such setAlpha(mView, Math.max(0f, Math.min(1f, 1f - 2f * Math.abs(deltaX) / mViewWidth))); return true; } break; } } return false; } private void performDismiss() { // Animate the dismissed view to zero-height and then fire the dismiss callback. // This triggers layout on each animation frame; in the future we may want to do something // smarter and more performant. final ViewGroup.LayoutParams lp = mView.getLayoutParams(); final int originalHeight = mView.getHeight(); ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime); animator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mCallback.onDismiss(mView, mToken); // Reset view presentation setAlpha(mView, 1f); setTranslationX(mView, 0); lp.height = originalHeight; mView.setLayoutParams(lp); } }); animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { lp.height = (Integer) valueAnimator.getAnimatedValue(); mView.setLayoutParams(lp); } }); animator.start(); } }