473 lines
18 KiB
Java
473 lines
18 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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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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package android.support.v4.widget;
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import android.content.Context;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.support.v4.view.ViewCompat;
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import android.util.AttributeSet;
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import android.util.DisplayMetrics;
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import android.view.MotionEvent;
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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.animation.AccelerateInterpolator;
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import android.view.animation.Animation;
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import android.view.animation.Animation.AnimationListener;
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import android.view.animation.DecelerateInterpolator;
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import android.view.animation.Transformation;
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import android.widget.AbsListView;
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/**
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* Same as SwipeRefreshLayout, only updateContentOffsetTop and REFRESH_TRIGGER_DISTANCE
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* have been modified!
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*/
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public class NoScrollableSwipeRefreshLayout extends ViewGroup {
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private static final long RETURN_TO_ORIGINAL_POSITION_TIMEOUT = 300;
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private static final float ACCELERATE_INTERPOLATION_FACTOR = 1.5f;
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private static final float DECELERATE_INTERPOLATION_FACTOR = 2f;
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private static final float PROGRESS_BAR_HEIGHT = 4;
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private static final float MAX_SWIPE_DISTANCE_FACTOR = .6f;
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private static final int REFRESH_TRIGGER_DISTANCE = 200;
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private SwipeProgressBar mProgressBar; //the thing that shows progress is going
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private View mTarget; //the content that gets pulled down
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private int mOriginalOffsetTop;
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private OnRefreshListener mListener;
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private MotionEvent mDownEvent;
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private int mFrom;
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private boolean mRefreshing = false;
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private int mTouchSlop;
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private float mDistanceToTriggerSync = -1;
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private float mPrevY;
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private int mMediumAnimationDuration;
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private float mFromPercentage = 0;
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private float mCurrPercentage = 0;
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private int mProgressBarHeight;
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private int mCurrentTargetOffsetTop;
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// Target is returning to its start offset because it was cancelled or a
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// refresh was triggered.
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private boolean mReturningToStart;
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private final DecelerateInterpolator mDecelerateInterpolator;
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private final AccelerateInterpolator mAccelerateInterpolator;
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private static final int[] LAYOUT_ATTRS = new int[] {
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android.R.attr.enabled
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};
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private final Animation mAnimateToStartPosition = new Animation() {
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@Override
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public void applyTransformation(float interpolatedTime, Transformation t) {
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int targetTop = 0;
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if (mFrom != mOriginalOffsetTop) {
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targetTop = (mFrom + (int)((mOriginalOffsetTop - mFrom) * interpolatedTime));
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}
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int offset = targetTop - mTarget.getTop();
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final int currentTop = mTarget.getTop();
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if (offset + currentTop < 0) {
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offset = 0 - currentTop;
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}
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setTargetOffsetTopAndBottom(offset);
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}
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};
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private Animation mShrinkTrigger = new Animation() {
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@Override
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public void applyTransformation(float interpolatedTime, Transformation t) {
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float percent = mFromPercentage + ((0 - mFromPercentage) * interpolatedTime);
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mProgressBar.setTriggerPercentage(percent);
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}
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};
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private final AnimationListener mReturnToStartPositionListener = new BaseAnimationListener() {
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@Override
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public void onAnimationEnd(Animation animation) {
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// Once the target content has returned to its start position, reset
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// the target offset to 0
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mCurrentTargetOffsetTop = 0;
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}
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};
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private final AnimationListener mShrinkAnimationListener = new BaseAnimationListener() {
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@Override
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public void onAnimationEnd(Animation animation) {
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mCurrPercentage = 0;
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}
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};
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private final Runnable mReturnToStartPosition = new Runnable() {
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@Override
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public void run() {
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mReturningToStart = true;
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animateOffsetToStartPosition(mCurrentTargetOffsetTop + getPaddingTop(),
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mReturnToStartPositionListener);
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}
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};
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// Cancel the refresh gesture and animate everything back to its original state.
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private final Runnable mCancel = new Runnable() {
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@Override
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public void run() {
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mReturningToStart = true;
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// Timeout fired since the user last moved their finger; animate the
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// trigger to 0 and put the target back at its original position
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if (mProgressBar != null) {
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mFromPercentage = mCurrPercentage;
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mShrinkTrigger.setDuration(mMediumAnimationDuration);
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mShrinkTrigger.setAnimationListener(mShrinkAnimationListener);
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mShrinkTrigger.reset();
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mShrinkTrigger.setInterpolator(mDecelerateInterpolator);
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startAnimation(mShrinkTrigger);
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}
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animateOffsetToStartPosition(mCurrentTargetOffsetTop + getPaddingTop(),
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mReturnToStartPositionListener);
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}
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};
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/**
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* Simple constructor to use when creating a SwipeRefreshLayout from code.
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* @param context
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*/
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public NoScrollableSwipeRefreshLayout(Context context) {
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this(context, null);
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}
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/**
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* Constructor that is called when inflating SwipeRefreshLayout from XML.
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* @param context
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* @param attrs
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*/
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public NoScrollableSwipeRefreshLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
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mMediumAnimationDuration = getResources().getInteger(
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android.R.integer.config_mediumAnimTime);
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setWillNotDraw(false);
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mProgressBar = new SwipeProgressBar(this);
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final DisplayMetrics metrics = getResources().getDisplayMetrics();
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mProgressBarHeight = (int) (metrics.density * PROGRESS_BAR_HEIGHT);
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mDecelerateInterpolator = new DecelerateInterpolator(DECELERATE_INTERPOLATION_FACTOR);
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mAccelerateInterpolator = new AccelerateInterpolator(ACCELERATE_INTERPOLATION_FACTOR);
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final TypedArray a = context.obtainStyledAttributes(attrs, LAYOUT_ATTRS);
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setEnabled(a.getBoolean(0, true));
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a.recycle();
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}
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@Override
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public void onAttachedToWindow() {
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super.onAttachedToWindow();
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removeCallbacks(mCancel);
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removeCallbacks(mReturnToStartPosition);
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}
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@Override
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public void onDetachedFromWindow() {
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super.onDetachedFromWindow();
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removeCallbacks(mReturnToStartPosition);
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removeCallbacks(mCancel);
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}
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private void animateOffsetToStartPosition(int from, AnimationListener listener) {
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mFrom = from;
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mAnimateToStartPosition.reset();
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mAnimateToStartPosition.setDuration(mMediumAnimationDuration);
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mAnimateToStartPosition.setAnimationListener(listener);
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mAnimateToStartPosition.setInterpolator(mDecelerateInterpolator);
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mTarget.startAnimation(mAnimateToStartPosition);
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}
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/**
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* Set the listener to be notified when a refresh is triggered via the swipe
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* gesture.
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*/
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public void setOnRefreshListener(OnRefreshListener listener) {
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mListener = listener;
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}
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private void setTriggerPercentage(float percent) {
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if (percent == 0f) {
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// No-op. A null trigger means it's uninitialized, and setting it to zero-percent
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// means we're trying to reset state, so there's nothing to reset in this case.
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mCurrPercentage = 0;
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return;
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}
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mCurrPercentage = percent;
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mProgressBar.setTriggerPercentage(percent);
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}
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/**
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* Notify the widget that refresh state has changed. Do not call this when
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* refresh is triggered by a swipe gesture.
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*
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* @param refreshing Whether or not the view should show refresh progress.
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*/
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public void setRefreshing(boolean refreshing) {
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if (mRefreshing != refreshing) {
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ensureTarget();
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mCurrPercentage = 0;
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mRefreshing = refreshing;
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if (mRefreshing) {
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mProgressBar.start();
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} else {
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mProgressBar.stop();
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}
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}
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}
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/**
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* Set the four colors used in the progress animation. The first color will
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* also be the color of the bar that grows in response to a user swipe
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* gesture.
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*
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* @param colorRes1 Color resource.
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* @param colorRes2 Color resource.
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* @param colorRes3 Color resource.
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* @param colorRes4 Color resource.
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*/
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public void setColorScheme(int colorRes1, int colorRes2, int colorRes3, int colorRes4) {
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ensureTarget();
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final Resources res = getResources();
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final int color1 = res.getColor(colorRes1);
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final int color2 = res.getColor(colorRes2);
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final int color3 = res.getColor(colorRes3);
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final int color4 = res.getColor(colorRes4);
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mProgressBar.setColorScheme(color1, color2, color3,color4);
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}
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/**
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* @return Whether the SwipeRefreshWidget is actively showing refresh
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* progress.
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*/
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public boolean isRefreshing() {
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return mRefreshing;
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}
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private void ensureTarget() {
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// Don't bother getting the parent height if the parent hasn't been laid out yet.
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if (mTarget == null) {
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if (getChildCount() > 1 && !isInEditMode()) {
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throw new IllegalStateException(
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"SwipeRefreshLayout can host only one direct child");
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}
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mTarget = getChildAt(0);
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mOriginalOffsetTop = mTarget.getTop() + getPaddingTop();
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}
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if (mDistanceToTriggerSync == -1) {
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if (getParent() != null && ((View)getParent()).getHeight() > 0) {
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final DisplayMetrics metrics = getResources().getDisplayMetrics();
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mDistanceToTriggerSync = (int) Math.min(
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((View) getParent()) .getHeight() * MAX_SWIPE_DISTANCE_FACTOR,
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REFRESH_TRIGGER_DISTANCE * metrics.density);
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}
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}
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}
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@Override
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public void draw(Canvas canvas) {
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super.draw(canvas);
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mProgressBar.draw(canvas);
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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final int width = getMeasuredWidth();
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final int height = getMeasuredHeight();
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mProgressBar.setBounds(0, 0, width, mProgressBarHeight);
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if (getChildCount() == 0) {
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return;
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}
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final View child = getChildAt(0);
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final int childLeft = getPaddingLeft();
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final int childTop = mCurrentTargetOffsetTop + getPaddingTop();
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final int childWidth = width - getPaddingLeft() - getPaddingRight();
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final int childHeight = height - getPaddingTop() - getPaddingBottom();
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child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
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}
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@Override
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public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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if (getChildCount() > 1 && !isInEditMode()) {
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throw new IllegalStateException("SwipeRefreshLayout can host only one direct child");
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}
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if (getChildCount() > 0) {
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getChildAt(0).measure(
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MeasureSpec.makeMeasureSpec(
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getMeasuredWidth() - getPaddingLeft() - getPaddingRight(),
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MeasureSpec.EXACTLY),
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MeasureSpec.makeMeasureSpec(
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getMeasuredHeight() - getPaddingTop() - getPaddingBottom(),
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MeasureSpec.EXACTLY));
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}
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}
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/**
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* @return Whether it is possible for the child view of this layout to
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* scroll up. Override this if the child view is a custom view.
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*/
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public boolean canChildScrollUp() {
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if (android.os.Build.VERSION.SDK_INT < 14) {
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if (mTarget instanceof AbsListView) {
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final AbsListView absListView = (AbsListView) mTarget;
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return absListView.getChildCount() > 0
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&& (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)
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.getTop() < absListView.getPaddingTop());
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} else {
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return mTarget.getScrollY() > 0;
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}
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} else {
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return ViewCompat.canScrollVertically(mTarget, -1);
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}
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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ensureTarget();
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boolean handled = false;
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if (mReturningToStart && ev.getAction() == MotionEvent.ACTION_DOWN) {
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mReturningToStart = false;
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}
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if (isEnabled() && !mReturningToStart && !canChildScrollUp()) {
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handled = onTouchEvent(ev);
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}
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return !handled ? super.onInterceptTouchEvent(ev) : handled;
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}
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@Override
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public void requestDisallowInterceptTouchEvent(boolean b) {
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// Nope.
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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final int action = event.getAction();
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boolean handled = false;
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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mCurrPercentage = 0;
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mDownEvent = MotionEvent.obtain(event);
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mPrevY = mDownEvent.getY();
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break;
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case MotionEvent.ACTION_MOVE:
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if (mDownEvent != null && !mReturningToStart) {
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final float eventY = event.getY();
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float yDiff = eventY - mDownEvent.getY();
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if (yDiff > mTouchSlop) {
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// User velocity passed min velocity; trigger a refresh
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if (yDiff > mDistanceToTriggerSync) {
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// User movement passed distance; trigger a refresh
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startRefresh();
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handled = true;
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break;
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} else {
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// Just track the user's movement
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setTriggerPercentage(
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mAccelerateInterpolator.getInterpolation(
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yDiff / mDistanceToTriggerSync));
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float offsetTop = yDiff;
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if (mPrevY > eventY) {
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offsetTop = yDiff - mTouchSlop;
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}
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updateContentOffsetTop((int) (offsetTop));
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if (mPrevY > eventY && (mTarget.getTop() < mTouchSlop)) {
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// If the user puts the view back at the top, we
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// don't need to. This shouldn't be considered
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// cancelling the gesture as the user can restart from the top.
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removeCallbacks(mCancel);
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} else {
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updatePositionTimeout();
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}
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mPrevY = event.getY();
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handled = true;
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}
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}
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}
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break;
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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if (mDownEvent != null) {
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mDownEvent.recycle();
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mDownEvent = null;
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}
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break;
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}
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return handled;
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}
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private void startRefresh() {
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removeCallbacks(mCancel);
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mReturnToStartPosition.run();
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setRefreshing(true);
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mListener.onRefresh();
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}
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private void updateContentOffsetTop(int targetTop) {
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final int currentTop = mTarget.getTop();
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if (targetTop > mDistanceToTriggerSync) {
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targetTop = (int) mDistanceToTriggerSync;
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} else if (targetTop < 0) {
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targetTop = 0;
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}
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// setTargetOffsetTopAndBottom(targetTop - currentTop);
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}
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private void setTargetOffsetTopAndBottom(int offset) {
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mTarget.offsetTopAndBottom(offset);
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mCurrentTargetOffsetTop = mTarget.getTop();
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}
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private void updatePositionTimeout() {
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removeCallbacks(mCancel);
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postDelayed(mCancel, RETURN_TO_ORIGINAL_POSITION_TIMEOUT);
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}
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/**
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* Classes that wish to be notified when the swipe gesture correctly
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* triggers a refresh should implement this interface.
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*/
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public interface OnRefreshListener {
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public void onRefresh();
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}
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/**
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* Simple AnimationListener to avoid having to implement unneeded methods in
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* AnimationListeners.
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*/
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private class BaseAnimationListener implements AnimationListener {
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@Override
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public void onAnimationStart(Animation animation) {
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}
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@Override
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public void onAnimationEnd(Animation animation) {
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}
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@Override
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public void onAnimationRepeat(Animation animation) {
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}
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}
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} |