jianshu_code

package android.support.v4.view; import android.view.animation.*; import android.support.v4.widget.*; import android.graphics.drawable.*; import android.widget.*; import java.lang.reflect.*; import android.content.*; import java.util.*; import android.util.*; import android.view.accessibility.*; import android.graphics.*; import android.database.*; import android.content.res.*; import android.support.v4.view.accessibility.*; import android.view.*; import android.os.*; import android.support.v4.os.*; public class ViewPager extends ViewGroup { private static final int CLOSE_ENOUGH = 2; private static final Comparator<ItemInfo> COMPARATOR; private static final boolean DEBUG = false; private static final int DEFAULT_GUTTER_SIZE = 16; private static final int DEFAULT_OFFSCREEN_PAGES = 1; private static final int DRAW_ORDER_DEFAULT = 0; private static final int DRAW_ORDER_FORWARD = 1; private static final int DRAW_ORDER_REVERSE = 2; private static final int INVALID_POINTER = -1; private static final int[] LAYOUT_ATTRS; private static final int MAX_SETTLE_DURATION = 600; private static final int MIN_DISTANCE_FOR_FLING = 25; private static final int MIN_FLING_VELOCITY = 400; public static final int SCROLL_STATE_DRAGGING = 1; public static final int SCROLL_STATE_IDLE = 0; public static final int SCROLL_STATE_SETTLING = 2; private static final String TAG = "ViewPager"; private static final boolean USE_CACHE; private static final Interpolator sInterpolator; private static final ViewPositionComparator sPositionComparator; private int mActivePointerId; private PagerAdapter mAdapter; private OnAdapterChangeListener mAdapterChangeListener; private int mBottomPageBounds; private boolean mCalledSuper; private int mChildHeightMeasureSpec; private int mChildWidthMeasureSpec; private int mCloseEnough; private int mCurItem; private int mDecorChildCount; private int mDefaultGutterSize; private int mDrawingOrder; private ArrayList<View> mDrawingOrderedChildren; private final Runnable mEndScrollRunnable; private int mExpectedAdapterCount; private long mFakeDragBeginTime; private boolean mFakeDragging; private boolean mFirstLayout; private float mFirstOffset; private int mFlingDistance; private int mGutterSize; private boolean mIgnoreGutter; private boolean mInLayout; private float mInitialMotionX; private float mInitialMotionY; private OnPageChangeListener mInternalPageChangeListener; private boolean mIsBeingDragged; private boolean mIsUnableToDrag; private final ArrayList<ItemInfo> mItems; private float mLastMotionX; private float mLastMotionY; private float mLastOffset; private EdgeEffectCompat mLeftEdge; private Drawable mMarginDrawable; private int mMaximumVelocity; private int mMinimumVelocity; private boolean mNeedCalculatePageOffsets; private PagerObserver mObserver; private int mOffscreenPageLimit; private OnPageChangeListener mOnPageChangeListener; private int mPageMargin; private PageTransformer mPageTransformer; private boolean mPopulatePending; private Parcelable mRestoredAdapterState; private ClassLoader mRestoredClassLoader; private int mRestoredCurItem; private EdgeEffectCompat mRightEdge; private int mScrollState; private Scroller mScroller; private boolean mScrollingCacheEnabled; private Method mSetChildrenDrawingOrderEnabled; private final ItemInfo mTempItem; private final Rect mTempRect; private int mTopPageBounds; private int mTouchSlop; private VelocityTracker mVelocityTracker; static { LAYOUT_ATTRS = new int[] { 16842931 }; COMPARATOR = new Comparator<ItemInfo>() { @Override public int compare(final ItemInfo itemInfo, final ItemInfo itemInfo2) { return itemInfo.position - itemInfo2.position; } }; sInterpolator = (Interpolator)new Interpolator() { public float getInterpolation(final float n) { final float n2 = n - 1.0f; return 1.0f + n2 * (n2 * (n2 * (n2 * n2))); } }; sPositionComparator = new ViewPositionComparator(); } public ViewPager(final Context context) { super(context); this.mItems = new ArrayList<ItemInfo>(); this.mTempItem = new ItemInfo(); this.mTempRect = new Rect(); this.mRestoredCurItem = -1; this.mRestoredAdapterState = null; this.mRestoredClassLoader = null; this.mFirstOffset = -3.4028235E38f; this.mLastOffset = Float.MAX_VALUE; this.mOffscreenPageLimit = 1; this.mActivePointerId = -1; this.mFirstLayout = true; this.mNeedCalculatePageOffsets = false; this.mEndScrollRunnable = new Runnable() { @Override public void run() { ViewPager.this.setScrollState(0); ViewPager.this.populate(); } }; this.mScrollState = 0; this.initViewPager(); } public ViewPager(final Context context, final AttributeSet set) { super(context, set); this.mItems = new ArrayList<ItemInfo>(); this.mTempItem = new ItemInfo(); this.mTempRect = new Rect(); this.mRestoredCurItem = -1; this.mRestoredAdapterState = null; this.mRestoredClassLoader = null; this.mFirstOffset = -3.4028235E38f; this.mLastOffset = Float.MAX_VALUE; this.mOffscreenPageLimit = 1; this.mActivePointerId = -1; this.mFirstLayout = true; this.mNeedCalculatePageOffsets = false; this.mEndScrollRunnable = new Runnable() { @Override public void run() { ViewPager.this.setScrollState(0); ViewPager.this.populate(); } }; this.mScrollState = 0; this.initViewPager(); } private void calculatePageOffsets(final ItemInfo itemInfo, final int n, final ItemInfo itemInfo2) { final int count = this.mAdapter.getCount(); final int clientWidth = this.getClientWidth(); float n2; if (clientWidth > 0) { n2 = this.mPageMargin / clientWidth; } else { n2 = 0.0f; } if (itemInfo2 != null) { final int position = itemInfo2.position; if (position < itemInfo.position) { int n3 = 0; float offset = n2 + (itemInfo2.offset + itemInfo2.widthFactor); for (int i = position + 1; i <= itemInfo.position && n3 < this.mItems.size(); ++i) { ItemInfo itemInfo3; for (itemInfo3 = this.mItems.get(n3); i > itemInfo3.position && n3 < -1 + this.mItems.size(); ++n3, itemInfo3 = this.mItems.get(n3)) {} while (i < itemInfo3.position) { offset += n2 + this.mAdapter.getPageWidth(i); ++i; } itemInfo3.offset = offset; offset += n2 + itemInfo3.widthFactor; } } else if (position > itemInfo.position) { int n4 = -1 + this.mItems.size(); float offset2 = itemInfo2.offset; for (int j = position - 1; j >= itemInfo.position && n4 >= 0; --j) { ItemInfo itemInfo4; for (itemInfo4 = this.mItems.get(n4); j < itemInfo4.position && n4 > 0; --n4, itemInfo4 = this.mItems.get(n4)) {} while (j > itemInfo4.position) { offset2 -= n2 + this.mAdapter.getPageWidth(j); --j; } offset2 -= n2 + itemInfo4.widthFactor; itemI