Clear selection when empty space is tapped. (b04b1648) · Commits · e / os / android_frameworks_base

packages/DocumentsUI/src/com/android/documentsui/DirectoryFragment.java

+4 −2

Original line number	Diff line number	Diff line
		@@ -1440,9 +1440,11 @@ public class DirectoryFragment extends Fragment {
		}

		void selectAllFiles() {
		mSelectionManager.selectItems(0, mAdapter.getItemCount());
		boolean changed = mSelectionManager.setItemsSelected(0, mAdapter.getItemCount(), true);
		if (changed) {
		updateDisplayState();
		}
		}

		private void setupDragAndDropOnDirectoryView(View view) {
		// Listen for drops on non-directory items and empty space.

packages/DocumentsUI/src/com/android/documentsui/MultiSelectManager.java

+95 −39

Original line number	Diff line number	Diff line
		@@ -16,6 +16,9 @@

		package com.android.documentsui;

		import static com.android.internal.util.Preconditions.checkNotNull;
		import static com.android.internal.util.Preconditions.checkState;

		import android.support.v7.widget.RecyclerView;
		import android.support.v7.widget.RecyclerView.Adapter;
		import android.support.v7.widget.RecyclerView.AdapterDataObserver;
		@@ -94,13 +97,16 @@ public final class MultiSelectManager {
		});
		}

		/**
		* Constructs a new instance with {@code adapter} and {@code helper}.
		* @param adapter
		* @param helper
		* @hide
		*/
		@VisibleForTesting
		MultiSelectManager(Adapter<?> adapter, RecyclerViewHelper helper) {
		if (adapter == null) {
		throw new IllegalArgumentException("Adapter cannot be null.");
		}
		if (helper == null) {
		throw new IllegalArgumentException("Helper cannot be null.");
		}
		checkNotNull(adapter, "'adapter' cannot be null.");
		checkNotNull(helper, "'helper' cannot be null.");

		mHelper = helper;
		mAdapter = adapter;
		@@ -136,6 +142,12 @@ public final class MultiSelectManager {
		});
		}

		/**
		* Adds {@code callback} such that it will be notified when {@code MultiSelectManager}
		* events occur.
		*
		* @param callback
		*/
		public void addCallback(MultiSelectManager.Callback callback) {
		mCallbacks.add(callback);
		}
		@@ -165,18 +177,45 @@ public final class MultiSelectManager {
		return dest;
		}

		public void selectItem(int position) {
		selectItems(position, 1);
		/**
		* Causes item at {@code position} in adapter to be selected.
		*
		* @param position Adapter position
		* @param selected
		* @return True if the selection state of the item changed.
		*/
		public boolean setItemSelected(int position, boolean selected) {
		boolean changed = (selected)
		? mSelection.add(position)
		: mSelection.remove(position);

		if (changed) {
		notifyItemStateChanged(position, true);
		}
		return changed;
		}

		public void selectItems(int position, int length) {
		/**
		* @param position
		* @param length
		* @param selected
		* @return True if the selection state of any of the items changed.
		*/
		public boolean setItemsSelected(int position, int length, boolean selected) {
		boolean changed = false;
		for (int i = position; i < position + length; i++) {
		mSelection.add(i);
		changed \|= setItemSelected(i, selected);
		}
		return changed;
		}

		/**
		* Clears the selection.
		*/
		public void clearSelection() {
		if (DEBUG) Log.d(TAG, "Clearing selection");
		if (mSelection.isEmpty()) {
		return;
		}
		if (mIntermediateSelection == null) {
		mIntermediateSelection = new Selection();
		}
		@@ -185,14 +224,17 @@ public final class MultiSelectManager {

		for (int i = 0; i < mIntermediateSelection.size(); i++) {
		int position = mIntermediateSelection.get(i);
		mAdapter.notifyItemChanged(position);
		notifyItemStateChanged(position, false);
		}
		}

		public boolean onSingleTapUp(MotionEvent e) {
		/**
		* @param e
		* @return true if the event was consumed.
		*/
		private boolean onSingleTapUp(MotionEvent e) {
		if (DEBUG) Log.d(TAG, "Handling tap event.");
		if (mSelection.size() == 0) {
		if (mSelection.isEmpty()) {
		return false;
		}

		@@ -200,25 +242,30 @@ public final class MultiSelectManager {
		}

		/**
		* TODO: Roll this into {@link #onSingleTapUp(MotionEvent)} once MotionEvent
		* can be mocked.
		*
		* @param position
		* @return true if the event was consumed.
		* @hide
		*/
		@VisibleForTesting
		boolean onSingleTapUp(int position) {
		if (mSelection.size() == 0) {
		if (mSelection.isEmpty()) {
		return false;
		}

		if (position == RecyclerView.NO_POSITION) {
		if (DEBUG) Log.i(TAG, "View is null. Cannot handle tap event.");
		return false;
		if (DEBUG) Log.d(TAG, "View is null. Canceling selection.");
		clearSelection();
		return true;
		}

		toggleSelection(position);
		return true;
		}

		public void onLongPress(MotionEvent e) {
		private void onLongPress(MotionEvent e) {
		if (DEBUG) Log.d(TAG, "Handling long press event.");

		int position = mHelper.findEventPosition(e);
		@@ -230,6 +277,9 @@ public final class MultiSelectManager {
		}

		/**
		* TODO: Roll this back into {@link #onLongPress(MotionEvent)} once MotionEvent
		* can be mocked.
		*
		* @param position
		* @hide
		*/
		@@ -255,7 +305,6 @@ public final class MultiSelectManager {
		if (notifyBeforeItemStateChange(position, nextState)) {
		boolean selected = mSelection.flip(position);
		notifyItemStateChanged(position, selected);
		mAdapter.notifyItemChanged(position);
		if (DEBUG) Log.d(TAG, "Selection after long press: " + mSelection);
		} else {
		Log.i(TAG, "Selection change cancelled by listener.");
		@@ -283,13 +332,13 @@ public final class MultiSelectManager {
		for (int i = lastListener; i > -1; i--) {
		mCallbacks.get(i).onItemStateChanged(position, selected);
		}
		mAdapter.notifyItemChanged(position);
		}

		/**
		* Object representing the current selection.
		* Object representing the current selection. Provides read only access
		* public access, and private write access.
		*/
		// NOTE: Much of the code in this class was copious swiped from
		// ArrayUtils, GrowingArrayUtils, and SparseBooleanArray.
		public static final class Selection {

		private SparseBooleanArray mSelection;
		@@ -327,6 +376,13 @@ public final class MultiSelectManager {
		return mSelection.size();
		}

		/**
		* @return true if the selection is empty.
		*/
		public boolean isEmpty() {
		return mSelection.size() == 0;
		}

		private boolean flip(int position) {
		if (contains(position)) {
		remove(position);
		@@ -339,14 +395,22 @@ public final class MultiSelectManager {

		/** @hide */
		@VisibleForTesting
		void add(int position) {
		boolean add(int position) {
		if (!mSelection.get(position)) {
		mSelection.put(position, true);
		return true;
		}
		return false;
		}

		/** @hide */
		@VisibleForTesting
		void remove(int position) {
		boolean remove(int position) {
		if (mSelection.get(position)) {
		mSelection.delete(position);
		return true;
		}
		return false;
		}

		/**
		@@ -360,12 +424,8 @@ public final class MultiSelectManager {
		*/
		@VisibleForTesting
		void expand(int startPosition, int count) {
		if (startPosition < 0) {
		throw new IllegalArgumentException("startPosition must be non-negative");
		}
		if (count < 1) {
		throw new IllegalArgumentException("countMust be greater than 0");
		}
		checkState(startPosition >= 0);
		checkState(count > 0);

		for (int i = 0; i < mSelection.size(); i++) {
		int itemPosition = mSelection.keyAt(i);
		@@ -386,12 +446,8 @@ public final class MultiSelectManager {
		*/
		@VisibleForTesting
		void collapse(int startPosition, int count) {
		if (startPosition < 0) {
		throw new IllegalArgumentException("startPosition must be non-negative");
		}
		if (count < 1) {
		throw new IllegalArgumentException("countMust be greater than 0");
		}
		checkState(startPosition >= 0);
		checkState(count > 0);

		int endPosition = startPosition + count - 1;

		@@ -481,7 +537,7 @@ public final class MultiSelectManager {

		/**
		* A composite {@code OnGestureDetector} that allows us to delegate unhandled
		* events to other interested parties.
		* events to an outside party (presumably DirectoryFragment).
		*/
		private static final class CompositeOnGestureListener implements OnGestureListener {

packages/DocumentsUI/tests/src/com/android/documentsui/MultiSelectManagerTest.java

+18 −10

Original line number	Diff line number	Diff line
		@@ -64,33 +64,41 @@ public class MultiSelectManagerTest {
		}

		@Test
		public void singleTapDoesNotSelectBeforeLongPress() {
		mManager.onSingleTapUp(99);
		assertSelection();
		}

		@Test
		public void longPressStartsSelectionMode() {
		public void longPress_StartsSelectionMode() {
		mManager.onLongPress(7);
		assertSelection(7);
		}

		@Test
		public void secondLongPressExtendsSelection() {
		public void longPress_SecondPressExtendsSelection() {
		mManager.onLongPress(7);
		mManager.onLongPress(99);
		assertSelection(7, 99);
		}

		@Test
		public void singleTapUnselectedLastItem() {
		public void singleTapUp_DoesNotSelectBeforeLongPress() {
		mManager.onSingleTapUp(99);
		assertSelection();
		}

		@Test
		public void singleTapUp_UnselectsSelectedItem() {
		mManager.onLongPress(7);
		mManager.onSingleTapUp(7);
		assertSelection();
		}

		@Test
		public void singleTapUpExtendsSelection() {
		public void singleTapUp_NoPositionClearsSelection() {
		mManager.onLongPress(7);
		mManager.onSingleTapUp(11);
		mManager.onSingleTapUp(RecyclerView.NO_POSITION);
		assertSelection();
		}

		@Test
		public void singleTapUp_ExtendsSelection() {
		mManager.onLongPress(99);
		mManager.onSingleTapUp(7);
		mManager.onSingleTapUp(13);

packages/DocumentsUI/tests/src/com/android/documentsui/MultiSelectManager_SelectionTest.java

+7 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,13 @@ public class MultiSelectManager_SelectionTest {
		assertEquals(0, selection.size());
		}

		@Test
		public void isEmpty() {
		assertTrue(new Selection().isEmpty());
		selection.clear();
		assertTrue(selection.isEmpty());
		}

		@Test
		public void sizeAndGet() {
		Selection other = new Selection();