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+/*
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+ * Copyright 2013 Google Inc.
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package com.xzjmyk.pm.activity;
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+
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+import android.animation.Animator;
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+import android.animation.AnimatorListenerAdapter;
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+import android.animation.ValueAnimator;
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+import android.graphics.Rect;
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+import android.os.SystemClock;
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+import android.view.MotionEvent;
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+import android.view.VelocityTracker;
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+import android.view.View;
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+import android.view.ViewConfiguration;
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+import android.view.ViewGroup;
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+import android.view.ViewPropertyAnimator;
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+import android.widget.AbsListView;
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+import android.widget.ListView;
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+
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+import java.util.ArrayList;
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+import java.util.Collections;
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+import java.util.List;
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+
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+/**
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+ * A {@link View.OnTouchListener} that makes the list items in a {@link ListView}
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+ * dismissable. {@link ListView} is given special treatment because by default it handles touches
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+ * for its list items... i.e. it's in charge of drawing the pressed state (the list selector),
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+ * handling list item clicks, etc.
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+ *
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+ * <p>After creating the listener, the caller should also call
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+ * {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}, passing
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+ * in the scroll listener returned by {@link #makeScrollListener()}. If a scroll listener is
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+ * already assigned, the caller should still pass scroll changes through to this listener. This will
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+ * ensure that this {@link SwipeDismissListViewTouchListener} is paused during list view
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+ * scrolling.</p>
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+ *
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+ * <p>Example usage:</p>
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+ *
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+ * <pre>
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+ * SwipeDismissListViewTouchListener touchListener =
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+ * new SwipeDismissListViewTouchListener(
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+ * listView,
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+ * new SwipeDismissListViewTouchListener.OnDismissCallback() {
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+ * public void onDismiss(ListView listView, int[] reverseSortedPositions) {
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+ * for (int position : reverseSortedPositions) {
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+ * adapter.remove(adapter.getItem(position));
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+ * }
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+ * adapter.notifyDataSetChanged();
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+ * }
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+ * });
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+ * listView.setOnTouchListener(touchListener);
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+ * listView.setOnScrollListener(touchListener.makeScrollListener());
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+ * </pre>
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+ *
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+ * <p>This class Requires API level 12 or later due to use of {@link
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+ * ViewPropertyAnimator}.</p>
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+ *
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+ * <p>For a generalized {@link View.OnTouchListener} that makes any view dismissable,
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+ * see {@link SwipeDismissTouchListener}.</p>
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+ *
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+ * @see SwipeDismissTouchListener
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+ */
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+public class SwipeDismissListViewTouchListener implements View.OnTouchListener {
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+ // Cached ViewConfiguration and system-wide constant values
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+ private int mSlop;
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+ private int mMinFlingVelocity;
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+ private int mMaxFlingVelocity;
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+ private long mAnimationTime;
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+
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+ // Fixed properties
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+ private ListView mListView;
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+ private DismissCallbacks mCallbacks;
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+ private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
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+
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+ // Transient properties
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+ private List<PendingDismissData> mPendingDismisses = new ArrayList<PendingDismissData>();
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+ private int mDismissAnimationRefCount = 0;
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+ private float mDownX;
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+ private float mDownY;
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+ private boolean mSwiping;
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+ private int mSwipingSlop;
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+ private VelocityTracker mVelocityTracker;
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+ private int mDownPosition;
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+ private View mDownView;
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+ private boolean mPaused;
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+
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+ /**
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+ * The callback interface used by {@link SwipeDismissListViewTouchListener} to inform its client
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+ * about a successful dismissal of one or more list item positions.
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+ */
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+ public interface DismissCallbacks {
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+ /**
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+ * Called to determine whether the given position can be dismissed.
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+ */
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+ boolean canDismiss(int position);
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+
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+ /**
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+ * Called when the user has indicated they she would like to dismiss one or more list item
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+ * positions.
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+ *
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+ * @param listView The originating {@link ListView}.
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+ * @param reverseSortedPositions An array of positions to dismiss, sorted in descending
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+ * order for convenience.
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+ */
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+ void onDismiss(ListView listView, int[] reverseSortedPositions);
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+ }
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+
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+ /**
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+ * Constructs a new swipe-to-dismiss touch listener for the given list view.
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+ *
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+ * @param listView The list view whose items should be dismissable.
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+ * @param callbacks The callback to trigger when the user has indicated that she would like to
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+ * dismiss one or more list items.
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+ */
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+ public SwipeDismissListViewTouchListener(ListView listView, DismissCallbacks callbacks) {
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+ ViewConfiguration vc = ViewConfiguration.get(listView.getContext());
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+ mSlop = vc.getScaledTouchSlop();
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+ mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16;
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+ mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
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+ mAnimationTime = listView.getContext().getResources().getInteger(
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+ android.R.integer.config_shortAnimTime);
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+ mListView = listView;
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+ mCallbacks = callbacks;
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+ }
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+
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+ /**
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+ * Enables or disables (pauses or resumes) watching for swipe-to-dismiss gestures.
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+ *
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+ * @param enabled Whether or not to watch for gestures.
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+ */
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+ public void setEnabled(boolean enabled) {
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+ mPaused = !enabled;
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+ }
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+
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+ /**
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+ * Returns an {@link AbsListView.OnScrollListener} to be added to the {@link
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+ * ListView} using {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}.
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+ * If a scroll listener is already assigned, the caller should still pass scroll changes through
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+ * to this listener. This will ensure that this {@link SwipeDismissListViewTouchListener} is
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+ * paused during list view scrolling.</p>
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+ *
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+ * @see SwipeDismissListViewTouchListener
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+ */
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+ public AbsListView.OnScrollListener makeScrollListener() {
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+ return new AbsListView.OnScrollListener() {
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+ @Override
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+ public void onScrollStateChanged(AbsListView absListView, int scrollState) {
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+ setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
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+ }
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+
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+ @Override
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+ public void onScroll(AbsListView absListView, int i, int i1, int i2) {
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+ }
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+ };
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+ }
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+
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+ @Override
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+ public boolean onTouch(View view, MotionEvent motionEvent) {
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+ if (mViewWidth < 2) {
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+ mViewWidth = mListView.getWidth();
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+ }
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+
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+ switch (motionEvent.getActionMasked()) {
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+ case MotionEvent.ACTION_DOWN: {
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+ if (mPaused) {
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+ return false;
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+ }
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+
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+ // TODO: ensure this is a finger, and set a flag
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+
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+ // Find the child view that was touched (perform a hit test)
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+ Rect rect = new Rect();
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+ int childCount = mListView.getChildCount();
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+ int[] listViewCoords = new int[2];
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+ mListView.getLocationOnScreen(listViewCoords);
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+ int x = (int) motionEvent.getRawX() - listViewCoords[0];
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+ int y = (int) motionEvent.getRawY() - listViewCoords[1];
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+ View child;
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+ for (int i = 0; i < childCount; i++) {
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+ child = mListView.getChildAt(i);
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+ child.getHitRect(rect);
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+ if (rect.contains(x, y)) {
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+ mDownView = child;
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+ break;
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+ }
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+ }
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+
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+ if (mDownView != null) {
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+ mDownX = motionEvent.getRawX();
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+ mDownY = motionEvent.getRawY();
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+ mDownPosition = mListView.getPositionForView(mDownView);
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+ if (mCallbacks.canDismiss(mDownPosition)) {
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+ mVelocityTracker = VelocityTracker.obtain();
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+ mVelocityTracker.addMovement(motionEvent);
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+ } else {
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+ mDownView = null;
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+ }
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+ }
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+ return false;
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+ }
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+
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+ case MotionEvent.ACTION_CANCEL: {
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+ if (mVelocityTracker == null) {
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+ break;
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+ }
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+
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+ if (mDownView != null && mSwiping) {
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+ // cancel
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+ mDownView.animate()
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+ .translationX(0)
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+ .alpha(1)
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+ .setDuration(mAnimationTime)
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+ .setListener(null);
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+ }
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+ mVelocityTracker.recycle();
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+ mVelocityTracker = null;
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+ mDownX = 0;
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+ mDownY = 0;
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+ mDownView = null;
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+ mDownPosition = ListView.INVALID_POSITION;
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+ mSwiping = false;
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+ break;
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+ }
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+
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+ case MotionEvent.ACTION_UP: {
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+ if (mVelocityTracker == null) {
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+ break;
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+ }
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+
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+ float deltaX = motionEvent.getRawX() - mDownX;
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+ mVelocityTracker.addMovement(motionEvent);
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+ mVelocityTracker.computeCurrentVelocity(1000);
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+ float velocityX = mVelocityTracker.getXVelocity();
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+ float absVelocityX = Math.abs(velocityX);
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+ float absVelocityY = Math.abs(mVelocityTracker.getYVelocity());
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+ boolean dismiss = false;
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+ boolean dismissRight = false;
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+ if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) {
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+ dismiss = true;
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+ dismissRight = deltaX > 0;
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+ } else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity
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+ && absVelocityY < absVelocityX && mSwiping) {
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+ // dismiss only if flinging in the same direction as dragging
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+ dismiss = (velocityX < 0) == (deltaX < 0);
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+ dismissRight = mVelocityTracker.getXVelocity() > 0;
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+ }
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+ if (dismiss && mDownPosition != ListView.INVALID_POSITION) {
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+ // dismiss
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+ final View downView = mDownView; // mDownView gets null'd before animation ends
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+ final int downPosition = mDownPosition;
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+ ++mDismissAnimationRefCount;
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+ mDownView.animate()
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+ .translationX(dismissRight ? mViewWidth : -mViewWidth)
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+ .alpha(0)
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+ .setDuration(mAnimationTime)
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+ .setListener(new AnimatorListenerAdapter() {
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+ @Override
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+ public void onAnimationEnd(Animator animation) {
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+ performDismiss(downView, downPosition);
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+ }
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+ });
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+ } else {
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+ // cancel
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+ mDownView.animate()
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+ .translationX(0)
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+ .alpha(1)
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+ .setDuration(mAnimationTime)
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+ .setListener(null);
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+ }
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+ mVelocityTracker.recycle();
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+ mVelocityTracker = null;
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+ mDownX = 0;
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+ mDownY = 0;
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+ mDownView = null;
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+ mDownPosition = ListView.INVALID_POSITION;
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+ mSwiping = false;
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+ break;
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+ }
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+
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+ case MotionEvent.ACTION_MOVE: {
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+ if (mVelocityTracker == null || mPaused) {
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+ break;
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+ }
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+
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+ mVelocityTracker.addMovement(motionEvent);
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+ float deltaX = motionEvent.getRawX() - mDownX;
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+ float deltaY = motionEvent.getRawY() - mDownY;
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+ if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
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+ mSwiping = true;
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+ mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop);
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+ mListView.requestDisallowInterceptTouchEvent(true);
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+
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+ // Cancel ListView's touch (un-highlighting the item)
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+ MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
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+ cancelEvent.setAction(MotionEvent.ACTION_CANCEL |
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+ (motionEvent.getActionIndex()
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+ << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
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+ mListView.onTouchEvent(cancelEvent);
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+ cancelEvent.recycle();
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+ }
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+
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+ if (mSwiping) {
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+ mDownView.setTranslationX(deltaX - mSwipingSlop);
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+ mDownView.setAlpha(Math.max(0f, Math.min(1f,
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+ 1f - 2f * Math.abs(deltaX) / mViewWidth)));
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+ return true;
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+ }
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+ break;
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+ }
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+ }
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+ return false;
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+ }
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+
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+ class PendingDismissData implements Comparable<PendingDismissData> {
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+ public int position;
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+ public View view;
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+
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+ public PendingDismissData(int position, View view) {
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+ this.position = position;
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+ this.view = view;
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+ }
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+
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+ @Override
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+ public int compareTo(PendingDismissData other) {
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+ // Sort by descending position
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+ return other.position - position;
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+ }
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+ }
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+
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+ private void performDismiss(final View dismissView, final int dismissPosition) {
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+ // Animate the dismissed list item to zero-height and fire the dismiss callback when
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+ // all dismissed list item animations have completed. This triggers layout on each animation
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+ // frame; in the future we may want to do something smarter and more performant.
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+
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+ final ViewGroup.LayoutParams lp = dismissView.getLayoutParams();
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+ final int originalHeight = dismissView.getHeight();
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+
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+ ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);
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+
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+ animator.addListener(new AnimatorListenerAdapter() {
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+ @Override
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+ public void onAnimationEnd(Animator animation) {
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+ --mDismissAnimationRefCount;
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+ if (mDismissAnimationRefCount == 0) {
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+ // No active animations, process all pending dismisses.
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+ // Sort by descending position
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+ Collections.sort(mPendingDismisses);
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+
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+ int[] dismissPositions = new int[mPendingDismisses.size()];
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+ for (int i = mPendingDismisses.size() - 1; i >= 0; i--) {
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+ dismissPositions[i] = mPendingDismisses.get(i).position;
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+ }
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+ mCallbacks.onDismiss(mListView, dismissPositions);
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+
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+ // Reset mDownPosition to avoid MotionEvent.ACTION_UP trying to start a dismiss
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+ // animation with a stale position
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+ mDownPosition = ListView.INVALID_POSITION;
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+
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+ ViewGroup.LayoutParams lp;
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+ for (PendingDismissData pendingDismiss : mPendingDismisses) {
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+ // Reset view presentation
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+ pendingDismiss.view.setAlpha(1f);
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+ pendingDismiss.view.setTranslationX(0);
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+ lp = pendingDismiss.view.getLayoutParams();
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+ lp.height = originalHeight;
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+ pendingDismiss.view.setLayoutParams(lp);
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+ }
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+
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+ // Send a cancel event
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+ long time = SystemClock.uptimeMillis();
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+ MotionEvent cancelEvent = MotionEvent.obtain(time, time,
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+ MotionEvent.ACTION_CANCEL, 0, 0, 0);
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+ mListView.dispatchTouchEvent(cancelEvent);
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+
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+ mPendingDismisses.clear();
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+ }
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+ }
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+ });
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+
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+ animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
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+ @Override
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+ public void onAnimationUpdate(ValueAnimator valueAnimator) {
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+ lp.height = (Integer) valueAnimator.getAnimatedValue();
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+ dismissView.setLayoutParams(lp);
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+ }
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+ });
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+
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+ mPendingDismisses.add(new PendingDismissData(dismissPosition, dismissView));
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+ animator.start();
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+ }
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+}
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