am 35af3639: Merge "Fix bug 5173029 - make fast scroller aware of scrolling... (4d9adfe6) · Commits · e / os / android_frameworks_base

core/java/android/widget/FastScroller.java

+117 −22

Original line number	Diff line number	Diff line
		@@ -29,12 +29,14 @@ import android.os.Handler;
		import android.os.SystemClock;
		import android.view.MotionEvent;
		import android.view.View;
		import android.view.ViewConfiguration;
		import android.widget.AbsListView.OnScrollListener;

		/**
		* Helper class for AbsListView to draw and control the Fast Scroll thumb
		*/
		class FastScroller {
		private static final String TAG = "FastScroller";

		// Minimum number of pages to justify showing a fast scroll thumb
		private static int MIN_PAGES = 4;
		@@ -81,15 +83,15 @@ class FastScroller {
		private Drawable mOverlayDrawableLeft;
		private Drawable mOverlayDrawableRight;

		private int mThumbH;
		private int mThumbW;
		private int mThumbY;
		int mThumbH;
		int mThumbW;
		int mThumbY;

		private RectF mOverlayPos;
		private int mOverlaySize;

		private AbsListView mList;
		private boolean mScrollCompleted;
		AbsListView mList;
		boolean mScrollCompleted;
		private int mVisibleItem;
		private Paint mPaint;
		private int mListOffset;
		@@ -105,7 +107,7 @@ class FastScroller {

		private Handler mHandler = new Handler();

		private BaseAdapter mListAdapter;
		BaseAdapter mListAdapter;
		private SectionIndexer mSectionIndexer;

		private boolean mChangedBounds;
		@@ -118,10 +120,36 @@ class FastScroller {

		private boolean mMatchDragPosition;

		float mInitialTouchY;
		boolean mPendingDrag;
		private int mScaledTouchSlop;

		private static final int FADE_TIMEOUT = 1500;
		private static final int PENDING_DRAG_DELAY = 180;

		private final Rect mTmpRect = new Rect();

		private final Runnable mDeferStartDrag = new Runnable() {
		public void run() {
		if (mList.mIsAttached) {
		beginDrag();

		final int viewHeight = mList.getHeight();
		// Jitter
		int newThumbY = (int) mInitialTouchY - mThumbH + 10;
		if (newThumbY < 0) {
		newThumbY = 0;
		} else if (newThumbY + mThumbH > viewHeight) {
		newThumbY = viewHeight - mThumbH;
		}
		mThumbY = newThumbY;
		scrollTo((float) mThumbY / (viewHeight - mThumbH));
		}

		mPendingDrag = false;
		}
		};

		public FastScroller(Context context, AbsListView listView) {
		mList = listView;
		init(context);
		@@ -264,6 +292,8 @@ class FastScroller {

		ta.recycle();

		mScaledTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();

		mMatchDragPosition = context.getApplicationInfo().targetSdkVersion >=
		android.os.Build.VERSION_CODES.HONEYCOMB;

		@@ -456,7 +486,7 @@ class FastScroller {
		return mSections;
		}

		private void getSectionsFromIndexer() {
		void getSectionsFromIndexer() {
		Adapter adapter = mList.getAdapter();
		mSectionIndexer = null;
		if (adapter instanceof HeaderViewListAdapter) {
		@@ -489,7 +519,7 @@ class FastScroller {
		mListAdapter = null;
		}

		private void scrollTo(float position) {
		void scrollTo(float position) {
		int count = mList.getCount();
		mScrollCompleted = false;
		float fThreshold = (1.0f / count) / 8;
		@@ -647,12 +677,45 @@ class FastScroller {
		cancelFling.recycle();
		}

		boolean onInterceptTouchEvent(MotionEvent ev) {
		if (mState > STATE_NONE && ev.getAction() == MotionEvent.ACTION_DOWN) {
		if (isPointInside(ev.getX(), ev.getY())) {
		void cancelPendingDrag() {
		mList.removeCallbacks(mDeferStartDrag);
		mPendingDrag = false;
		}

		void startPendingDrag() {
		mPendingDrag = true;
		mList.postDelayed(mDeferStartDrag, PENDING_DRAG_DELAY);
		}

		void beginDrag() {
		setState(STATE_DRAGGING);
		if (mListAdapter == null && mList != null) {
		getSectionsFromIndexer();
		}
		if (mList != null) {
		mList.requestDisallowInterceptTouchEvent(true);
		mList.reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
		}

		cancelFling();
		}

		boolean onInterceptTouchEvent(MotionEvent ev) {
		switch (ev.getActionMasked()) {
		case MotionEvent.ACTION_DOWN:
		if (mState > STATE_NONE && isPointInside(ev.getX(), ev.getY())) {
		if (!mList.isInScrollingContainer()) {
		beginDrag();
		return true;
		}
		mInitialTouchY = ev.getY();
		startPendingDrag();
		}
		break;
		case MotionEvent.ACTION_UP:
		case MotionEvent.ACTION_CANCEL:
		cancelPendingDrag();
		break;
		}
		return false;
		}
		@@ -666,19 +729,32 @@ class FastScroller {

		if (action == MotionEvent.ACTION_DOWN) {
		if (isPointInside(me.getX(), me.getY())) {
		setState(STATE_DRAGGING);
		if (mListAdapter == null && mList != null) {
		getSectionsFromIndexer();
		if (!mList.isInScrollingContainer()) {
		beginDrag();
		return true;
		}
		if (mList != null) {
		mList.requestDisallowInterceptTouchEvent(true);
		mList.reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
		mInitialTouchY = me.getY();
		startPendingDrag();
		}
		} else if (action == MotionEvent.ACTION_UP) { // don't add ACTION_CANCEL here
		if (mPendingDrag) {
		// Allow a tap to scroll.
		beginDrag();

		cancelFling();
		return true;
		final int viewHeight = mList.getHeight();
		// Jitter
		int newThumbY = (int) me.getY() - mThumbH + 10;
		if (newThumbY < 0) {
		newThumbY = 0;
		} else if (newThumbY + mThumbH > viewHeight) {
		newThumbY = viewHeight - mThumbH;
		}
		mThumbY = newThumbY;
		scrollTo((float) mThumbY / (viewHeight - mThumbH));

		cancelPendingDrag();
		// Will hit the STATE_DRAGGING check below
		}
		} else if (action == MotionEvent.ACTION_UP) { // don't add ACTION_CANCEL here
		if (mState == STATE_DRAGGING) {
		if (mList != null) {
		// ViewGroup does the right thing already, but there might
		@@ -698,6 +774,23 @@ class FastScroller {
		return true;
		}
		} else if (action == MotionEvent.ACTION_MOVE) {
		if (mPendingDrag) {
		final float y = me.getY();
		if (Math.abs(y - mInitialTouchY) > mScaledTouchSlop) {
		setState(STATE_DRAGGING);
		if (mListAdapter == null && mList != null) {
		getSectionsFromIndexer();
		}
		if (mList != null) {
		mList.requestDisallowInterceptTouchEvent(true);
		mList.reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
		}

		cancelFling();
		cancelPendingDrag();
		// Will hit the STATE_DRAGGING check below
		}
		}
		if (mState == STATE_DRAGGING) {
		final int viewHeight = mList.getHeight();
		// Jitter
		@@ -717,6 +810,8 @@ class FastScroller {
		}
		return true;
		}
		} else if (action == MotionEvent.ACTION_CANCEL) {
		cancelPendingDrag();
		}
		return false;
		}