app/src/main/java/me/zhanghai/android/douya/ui/FlexibleSpaceLayout.java

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/*
 * Copyright (c) 2016 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

package me.zhanghai.android.douya.ui;

import android.animation.ObjectAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.os.Build;
import android.support.v4.view.InputDeviceCompat;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.animation.FastOutSlowInInterpolator;
import android.support.v4.widget.EdgeEffectCompat;
import android.support.v4.widget.FriendlyScrollerCompat;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.LinearLayout;

import butterknife.BindInt;
import butterknife.ButterKnife;

public class FlexibleSpaceLayout extends LinearLayout {

    private static final int INVALID_POINTER_ID = -1;

    @BindInt(android.R.integer.config_mediumAnimTime)
    int mMediumAnimationTime;

    private int mTouchSlop;
    private int mMinimumFlingVelocity;
    private int mMaximumFlingVelocity;

    private FlexibleSpaceHeaderView mHeaderView;
    private FlexibleSpaceContentView mContentView;

    private int mScroll;
    private boolean mHeaderCollapsed;

    private boolean mIsBeingDragged;
    private int mActivePointerId;
    private float mLastMotionY;
    private VelocityTracker mVelocityTracker;

    private FriendlyScrollerCompat mScroller;
    private EdgeEffectCompat mEdgeEffectBottom;

    private float mView_verticalScrollFactor = Float.MIN_VALUE;

    public FlexibleSpaceLayout(Context context) {
        super(context);