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/* * ****************************************************************************** * Copyright (c) 2013-2014 Gabriele Mariotti. */* www .j a v a 2s . 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 it.gmariotti.cardslib.library.prototypes; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.graphics.Rect; import android.view.MotionEvent; import android.view.VelocityTracker; import android.view.View; import android.view.ViewConfiguration; import android.widget.ListView; import it.gmariotti.cardslib.library.R; import it.gmariotti.cardslib.library.internal.Card; /** * @author Gabriele Mariotti (gabri.mariotti@gmail.com) */ public class SwipeDismissListItemViewTouchListener implements View.OnTouchListener { /** * The callback interface used by {@link SwipeDismissListItemViewTouchListener} to inform its client * about a successful dismissal of one or more list item positions. */ public interface DismissCallbacks { /** * Called to determine whether the given position can be dismissed. */ boolean canDismiss(int position, Card card, CardWithList.ListObject listObject); /** * Called when the user has indicated they she would like to dismiss one or more list item * positions. * * @param listView The originating {@link ListView}. * @param position position to dismiss */ void onDismiss(LinearListView listView, int position,boolean dismissRight); } private CardWithList.ListObject mListObject; private LinearListView mListView; // Cached ViewConfiguration and system-wide constant values private int mSlop; private int mMinFlingVelocity; private int mMaxFlingVelocity; private long mAnimationTime; // Fixed properties private View itemView; private DismissCallbacks mCallbacks; private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero // Transient properties private float mDownX; private float mDownY; //private Card mToken; private boolean mSwiping; private VelocityTracker mVelocityTracker; private boolean mPaused; private float mTranslationX; private int mSwipingSlop; private int mDownPosition; private View mDownView; private int swipeDistanceDivisor = 2; public SwipeDismissListItemViewTouchListener(LinearListView listView, DismissCallbacks callbacks) { ViewConfiguration vc = ViewConfiguration.get(listView.getContext()); mSlop = vc.getScaledTouchSlop(); mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16; mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity(); mAnimationTime = listView.getContext().getResources().getInteger( android.R.integer.config_shortAnimTime); this.mListView = listView; mCallbacks = callbacks; swipeDistanceDivisor = listView.getContext().getResources().getInteger(R.integer.list_card_swipe_distance_divisor); } @Override public boolean onTouch(View view, MotionEvent motionEvent) { if (mViewWidth < 2) { mViewWidth = mListView.getWidth(); } switch (motionEvent.getActionMasked()) { case MotionEvent.ACTION_DOWN: { if (mPaused) { return false; } if (mSwiping) { return true; } // Find the child view that was touched (perform a hit test) Rect rect = new Rect(); int childCount = mListView.getChildCount(); int headerCount = 0; int footerCount = 0; int[] listViewCoords = new int[2]; mListView.getLocationOnScreen(listViewCoords); int x = (int) motionEvent.getRawX() - listViewCoords[0]; int y = (int) motionEvent.getRawY() - listViewCoords[1]; View child=null; for (int i = headerCount; i < (childCount - footerCount); i++) { child = mListView.getChildAt(i); child.getHitRect(rect); if (rect.contains(x, y)) { mDownView = child; break; } } if (mDownView != null) { mDownX = motionEvent.getRawX(); mDownY = motionEvent.getRawY(); mDownPosition = mListView.getPositionForView(mDownView); CardWithList.ListObject object = mListView.getAdapter().getItem(mDownPosition); if (mCallbacks.canDismiss(mDownPosition, object.getParentCard(), object)) { mVelocityTracker = VelocityTracker.obtain(); mVelocityTracker.addMovement(motionEvent); } else { mDownView = null; } } view.onTouchEvent(motionEvent); return false; } case MotionEvent.ACTION_MOVE: { if (mVelocityTracker == null || mPaused) { break; } mVelocityTracker.addMovement(motionEvent); float deltaX = motionEvent.getRawX() - mDownX; float deltaY = motionEvent.getRawY() - mDownY; if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) { mSwiping = true; mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop); mDownView.getParent().requestDisallowInterceptTouchEvent(true); mListView.requestDisallowInterceptTouchEvent(true); // Cancel ListView's touch (un-highlighting the item) MotionEvent cancelEvent = MotionEvent.obtain(motionEvent); cancelEvent .setAction(MotionEvent.ACTION_CANCEL | (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); mDownView.onTouchEvent(cancelEvent); cancelEvent.recycle(); } if (mSwiping) { mDownView.setTranslationX(deltaX - mSwipingSlop); /* mDownView.setAlpha(Math.max(0f, Math.min(1f, 1f - 2f * Math.abs(deltaX) / mViewWidth))); */ return true; } break; } case MotionEvent.ACTION_UP: { if (mVelocityTracker == null) { break; } float deltaX = motionEvent.getRawX() - mDownX; mVelocityTracker.addMovement(motionEvent); mVelocityTracker.computeCurrentVelocity(1000); float velocityX = mVelocityTracker.getXVelocity(); float absVelocityX = Math.abs(velocityX); float absVelocityY = Math.abs(mVelocityTracker.getYVelocity()); boolean dismiss = false; boolean dismissRight = false; if (Math.abs(deltaX) > mViewWidth / swipeDistanceDivisor) { dismiss = true; dismissRight = deltaX > 0; } else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity && absVelocityY < absVelocityX && mSwiping) { // dismiss only if flinging in the same direction as dragging dismiss = (velocityX < 0) == (deltaX < 0); dismissRight = mVelocityTracker.getXVelocity() > 0; } if (dismiss && mDownPosition != ListView.INVALID_POSITION) { // dismiss dismiss(mDownView, mDownPosition, dismissRight); } else { // cancel mDownView.animate().translationX(0).alpha(1) .setDuration(mAnimationTime).setListener(null); } mVelocityTracker.recycle(); mVelocityTracker = null; mDownX = 0; mDownY = 0; mDownView = null; mDownPosition = ListView.INVALID_POSITION; if (mSwiping){ //To prevent onClick event with a fast swipe mSwiping = false; return true; } mSwiping = false; break; } case MotionEvent.ACTION_CANCEL: { if (mVelocityTracker == null) { break; } if (mDownView != null) { // cancel mDownView.animate() .translationX(0) .alpha(1) .setDuration(mAnimationTime) .setListener(null); } mVelocityTracker.recycle(); mVelocityTracker = null; mDownX = 0; mDownY = 0; mDownView = null; mDownPosition = ListView.INVALID_POSITION; mSwiping = false; break; } } return false; } private void dismiss(final View view, final int position, final boolean dismissRight) { if (view == null) { // No view, shortcut to calling onDismiss to let it deal with adapter // updates and all that. mCallbacks.onDismiss(mListView, position, dismissRight ); return; } view.animate() .translationX(dismissRight ? mViewWidth : -mViewWidth) .alpha(0) .setDuration(mAnimationTime) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { finalizeDismiss(view, position,dismissRight); } }); } private void finalizeDismiss(final View dismissView, final int dismissPosition,final boolean dismissRight ) { mCallbacks.onDismiss(mListView, dismissPosition,dismissRight); } }