315 lines
9.4 KiB
Java
315 lines
9.4 KiB
Java
/*
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* Copyright 2012 Doug Keen
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* Copyright 2012 Roman Nurik
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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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* ADAPTED FROM https://github.com/JakeWharton/SwipeToDismissNOA
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*/
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package com.dougkeen.bart.controls;
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import static com.nineoldandroids.view.ViewHelper.setAlpha;
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import static com.nineoldandroids.view.ViewHelper.setTranslationX;
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import static com.nineoldandroids.view.ViewPropertyAnimator.animate;
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import android.util.Log;
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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.View.MeasureSpec;
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import android.view.ViewConfiguration;
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import android.view.ViewGroup;
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import com.dougkeen.bart.model.Constants;
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import com.nineoldandroids.animation.Animator;
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import com.nineoldandroids.animation.AnimatorListenerAdapter;
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import com.nineoldandroids.animation.ValueAnimator;
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/**
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* A utility class for animating the dismissal of a view (with 'onDismiss'
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* callback). Also, a {@link android.view.View.OnTouchListener} that makes any
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* {@link View} dismissable when the user swipes (drags her finger) horizontally
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* across the view.
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*
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* <p>
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* <em>For {@link android.widget.ListView} list items that don't manage their own touch events
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* (i.e. you're using
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* {@link android.widget.ListView#setOnItemClickListener(android.widget.AdapterView.OnItemClickListener)}
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* or an equivalent listener on {@link android.app.ListActivity} or
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* {@link android.app.ListFragment}, use {@link SwipeDismissListViewTouchListener} instead.</em>
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* </p>
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*
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* <p>
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* Example usage:
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* </p>
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*
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* <pre>
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* view.setOnTouchListener(new SwipeDismisser(view, null, // Optional
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* // token/cookie
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* // object
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* new SwipeDismisser.OnDismissCallback() {
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* public void onDismiss(View view, Object token) {
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* parent.removeView(view);
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* }
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* }));
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* </pre>
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*
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* @see SwipeDismissListViewTouchListener
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*/
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public class SwipeHelper 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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// Fixed properties
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private View mView;
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private OnDismissCallback mCallback;
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private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
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// Transient properties
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private float mDownX;
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private boolean mSwiping;
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private Object mToken;
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private VelocityTracker mVelocityTracker;
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private float mTranslationX;
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/**
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* The callback interface used by {@link SwipeHelper} to inform its client
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* about a successful dismissal of the view for which it was created.
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*/
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public interface OnDismissCallback {
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/**
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* Called when the user has indicated they she would like to dismiss the
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* view.
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*
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* @param view
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* The originating {@link View} to be dismissed.
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* @param token
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* The optional token passed to this object's constructor.
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*/
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void onDismiss(View view, Object token);
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}
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/**
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* Constructs a new swipe-to-dismiss touch listener for the given view.
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*
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* @param view
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* The view to make dismissable.
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* @param token
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* An optional token/cookie object to be passed through to the
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* callback.
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* @param callback
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* The callback to trigger when the user has indicated that she
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* would like to dismiss this view.
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*/
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public SwipeHelper(View view, Object token, OnDismissCallback callback) {
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ViewConfiguration vc = ViewConfiguration.get(view.getContext());
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mSlop = vc.getScaledTouchSlop();
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mMinFlingVelocity = vc.getScaledMinimumFlingVelocity();
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mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
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mAnimationTime = view.getContext().getResources()
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.getInteger(android.R.integer.config_shortAnimTime);
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mView = view;
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mToken = token;
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mCallback = callback;
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}
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@Override
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public boolean onTouch(View view, MotionEvent motionEvent) {
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Log.v(Constants.TAG, "onTouch()");
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// offset because the view is translated during swipe
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motionEvent.offsetLocation(mTranslationX, 0);
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if (mViewWidth < 2) {
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mViewWidth = mView.getWidth();
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}
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switch (motionEvent.getActionMasked()) {
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case MotionEvent.ACTION_DOWN: {
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// TODO: ensure this is a finger, and set a flag
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mDownX = motionEvent.getRawX();
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mVelocityTracker = VelocityTracker.obtain();
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mVelocityTracker.addMovement(motionEvent);
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view.onTouchEvent(motionEvent);
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return false;
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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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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 = Math.abs(mVelocityTracker.getXVelocity());
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float velocityY = 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) {
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dismiss = true;
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dismissRight = deltaX > 0;
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} else if (mMinFlingVelocity <= velocityX
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&& velocityX <= mMaxFlingVelocity && velocityY < velocityX) {
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dismiss = true;
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dismissRight = mVelocityTracker.getXVelocity() > 0;
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}
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if (dismiss) {
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// dismiss
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dismissWithAnimation(dismissRight);
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} else {
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// cancel
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animate(mView).translationX(0).alpha(1)
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.setDuration(mAnimationTime).setListener(null);
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}
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mVelocityTracker = null;
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mTranslationX = 0;
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mDownX = 0;
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mSwiping = false;
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break;
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}
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case MotionEvent.ACTION_MOVE: {
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if (mVelocityTracker == null) {
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break;
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}
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mVelocityTracker.addMovement(motionEvent);
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float deltaX = motionEvent.getRawX() - mDownX;
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if (Math.abs(deltaX) > mSlop) {
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mSwiping = true;
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mView.getParent().requestDisallowInterceptTouchEvent(true);
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// Cancel listview's touch
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MotionEvent cancelEvent = MotionEvent.obtain(motionEvent);
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cancelEvent
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.setAction(MotionEvent.ACTION_CANCEL
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| (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
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mView.onTouchEvent(cancelEvent);
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}
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if (mSwiping) {
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mTranslationX = deltaX;
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setTranslationX(mView, deltaX);
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// TODO: use an ease-out interpolator or such
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setAlpha(
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mView,
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Math.max(
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0f,
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Math.min(1f, 1f - 2f * Math.abs(deltaX)
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/ 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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public void dismissWithAnimation(boolean dismissRight) {
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animate(mView).translationX(dismissRight ? mViewWidth : -mViewWidth)
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.alpha(0).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();
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}
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});
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}
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private void performDismiss() {
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// Animate the dismissed view to zero-height and then fire the dismiss
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// callback.
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// This triggers layout on each animation frame; in the future we may
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// want to do something
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// smarter and more performant.
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final ViewGroup.LayoutParams lp = mView.getLayoutParams();
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final int originalHeight = mView.getHeight();
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ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1)
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.setDuration(mAnimationTime);
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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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mCallback.onDismiss(mView, mToken);
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// Reset view presentation
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/*
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* Alpha stays at 0, otherwise Android 2.x leaves weird
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* artifacts
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*/
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// setAlpha(mView, 1f);
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setTranslationX(mView, 0);
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lp.height = originalHeight;
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mView.setLayoutParams(lp);
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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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mView.setLayoutParams(lp);
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}
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});
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animator.start();
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}
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public void showWithAnimation() {
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final int measureSpec = MeasureSpec.makeMeasureSpec(
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ViewGroup.LayoutParams.WRAP_CONTENT, MeasureSpec.EXACTLY);
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mView.measure(measureSpec, measureSpec);
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mViewWidth = mView.getMeasuredWidth();
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final int viewHeight = mView.getMeasuredHeight();
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setAlpha(mView, 0f);
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final ViewGroup.LayoutParams lp = mView.getLayoutParams();
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lp.width = mViewWidth;
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setTranslationX(mView, mViewWidth);
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// Grow space
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ValueAnimator animator = ValueAnimator.ofInt(1, viewHeight)
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.setDuration(mAnimationTime);
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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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// Reset view presentation
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// mView.requestLayout();
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// Swipe view into space that opened up
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animate(mView).translationX(0).alpha(1)
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.setDuration(mAnimationTime)
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.setListener(new AnimatorListenerAdapter() {
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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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mView.setLayoutParams(lp);
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}
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});
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animator.start();
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}
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} |