Set transient state for focus container in ListView (d44696c4) · Commits · e / os / android_frameworks_base

core/java/android/widget/AbsListView.java

+42 −33

Original line number	Diff line number	Diff line
		@@ -6500,49 +6500,56 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		}

		/**
		* Put a view into the ScrapViews list. These views are unordered.
		* Puts a view into the list of scrap views.
		* <p>
		* If the list data hasn't changed or the adapter has stable IDs, views
		* with transient state will be preserved for later retrieval.
		*
		* @param scrap The view to add
		* @param position The view's position within its parent
		*/
		void addScrapView(View scrap, int position) {
		AbsListView.LayoutParams lp = (AbsListView.LayoutParams) scrap.getLayoutParams();
		final AbsListView.LayoutParams lp = (AbsListView.LayoutParams) scrap.getLayoutParams();
		if (lp == null) {
		return;
		}

		lp.scrappedFromPosition = position;

		// Don't put header or footer views or views that should be ignored
		// into the scrap heap
		int viewType = lp.viewType;
		final boolean scrapHasTransientState = scrap.hasTransientState();
		if (!shouldRecycleViewType(viewType) \|\| scrapHasTransientState) {
		if (viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER && scrapHasTransientState) {
		if (mSkippedScrap == null) {
		mSkippedScrap = new ArrayList<View>();
		}
		mSkippedScrap.add(scrap);
		// Don't scrap header or footer views, or views that should
		// otherwise not be recycled.
		final int viewType = lp.viewType;
		if (!shouldRecycleViewType(viewType)) {
		return;
		}
		if (scrapHasTransientState) {

		scrap.dispatchStartTemporaryDetach();

		// Don't scrap views that have transient state.
		final boolean scrapHasTransientState = scrap.hasTransientState();
		if (scrapHasTransientState) {
		if (mAdapter != null && mAdapterHasStableIds) {
		// If the adapter has stable IDs, we can reuse the view for
		// the same data.
		if (mTransientStateViewsById == null) {
		mTransientStateViewsById = new LongSparseArray<View>();
		}
		mTransientStateViewsById.put(lp.itemId, scrap);
		} else if (!mDataChanged) {
		// avoid putting views on transient state list during a data change;
		// the layout positions may be out of sync with the adapter positions
		// If the data hasn't changed, we can reuse the views at
		// their old positions.
		if (mTransientStateViews == null) {
		mTransientStateViews = new SparseArray<View>();
		}
		mTransientStateViews.put(position, scrap);
		} else {
		// Otherwise, we'll have to remove the view and start over.
		if (mSkippedScrap == null) {
		mSkippedScrap = new ArrayList<View>();
		}
		mSkippedScrap.add(scrap);
		}
		return;
		}

		scrap.dispatchStartTemporaryDetach();
		} else {
		if (mViewTypeCount == 1) {
		mCurrentScrap.add(scrap);
		} else {
		@@ -6550,10 +6557,12 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		}

		scrap.setAccessibilityDelegate(null);

		if (mRecyclerListener != null) {
		mRecyclerListener.onMovedToScrapHeap(scrap);
		}
		}
		}

		/**
		* Finish the removal of any views that skipped the scrap heap.

core/java/android/widget/ListView.java

+33 −63

Original line number	Diff line number	Diff line
		@@ -1478,12 +1478,12 @@ public class ListView extends AbsListView {
		@Override
		protected void layoutChildren() {
		final boolean blockLayoutRequests = mBlockLayoutRequests;
		if (!blockLayoutRequests) {
		mBlockLayoutRequests = true;
		} else {
		if (blockLayoutRequests) {
		return;
		}

		mBlockLayoutRequests = true;

		try {
		super.layoutChildren();

		@@ -1495,10 +1495,10 @@ public class ListView extends AbsListView {
		return;
		}

		int childrenTop = mListPadding.top;
		int childrenBottom = mBottom - mTop - mListPadding.bottom;
		final int childrenTop = mListPadding.top;
		final int childrenBottom = mBottom - mTop - mListPadding.bottom;
		final int childCount = getChildCount();

		int childCount = getChildCount();
		int index = 0;
		int delta = 0;

		@@ -1507,8 +1507,6 @@ public class ListView extends AbsListView {
		View oldFirst = null;
		View newSel = null;

		View focusLayoutRestoreView = null;

		AccessibilityNodeInfo accessibilityFocusLayoutRestoreNode = null;
		View accessibilityFocusLayoutRestoreView = null;
		int accessibilityFocusPosition = INVALID_POSITION;
		@@ -1570,6 +1568,7 @@ public class ListView extends AbsListView {
		// Remember which child, if any, had accessibility focus. This must
		// occur before recycling any views, since that will clear
		// accessibility focus.
		// TODO: This should rely on transient state.
		final ViewRootImpl viewRootImpl = getViewRootImpl();
		if (viewRootImpl != null) {
		final View accessFocusedView = viewRootImpl.getAccessibilityFocusedHost();
		@@ -1593,16 +1592,18 @@ public class ListView extends AbsListView {
		}
		}

		// Ensure the child containing focus, if any, has transient state.
		// If the list data hasn't changed, or if the adapter has stable
		// IDs, this will maintain focus.
		final View focusedChild = getFocusedChild();
		if (focusedChild != null) {
		focusedChild.setHasTransientState(true);
		}

		// Pull all children into the RecycleBin.
		// These views will be reused if possible
		final int firstPosition = mFirstPosition;
		final RecycleBin recycleBin = mRecycler;

		// reset the focus restoration
		View focusLayoutRestoreDirectChild = null;

		// Don't put header or footer views into the Recycler. Those are
		// already cached in mHeaderViews;
		if (dataChanged) {
		for (int i = 0; i < childCount; i++) {
		recycleBin.addScrapView(getChildAt(i), firstPosition+i);
		@@ -1611,28 +1612,6 @@ public class ListView extends AbsListView {
		recycleBin.fillActiveViews(childCount, firstPosition);
		}

		// take focus back to us temporarily to avoid the eventual
		// call to clear focus when removing the focused child below
		// from messing things up when ViewAncestor assigns focus back
		// to someone else
		final View focusedChild = getFocusedChild();
		if (focusedChild != null) {
		// TODO: in some cases focusedChild.getParent() == null

		// we can remember the focused view to restore after relayout if the
		// data hasn't changed, or if the focused position is a header or footer
		if (!dataChanged \|\| isDirectChildHeaderOrFooter(focusedChild)) {
		focusLayoutRestoreDirectChild = focusedChild;
		// remember the specific view that had focus
		focusLayoutRestoreView = findFocus();
		if (focusLayoutRestoreView != null) {
		// tell it we are going to mess with it
		focusLayoutRestoreView.onStartTemporaryDetach();
		}
		}
		requestFocus();
		}

		// Clear out old views
		detachAllViewsFromParent();
		recycleBin.removeSkippedScrap();
		@@ -1692,43 +1671,37 @@ public class ListView extends AbsListView {
		recycleBin.scrapActiveViews();

		if (sel != null) {
		// the current selected item should get focus if items
		// are focusable
		if (mItemsCanFocus && hasFocus() && !sel.hasFocus()) {
		final boolean focusWasTaken = (sel == focusLayoutRestoreDirectChild &&
		focusLayoutRestoreView != null &&
		focusLayoutRestoreView.requestFocus()) \|\| sel.requestFocus();
		if (!focusWasTaken) {
		// selected item didn't take focus, fine, but still want
		// to make sure something else outside of the selected view
		// has focus
		final boolean shouldPlaceFocus = mItemsCanFocus && hasFocus();
		final boolean maintainedFocus = focusedChild != null && focusedChild.hasFocus();
		if (shouldPlaceFocus && !maintainedFocus && !sel.hasFocus()) {
		if (sel.requestFocus()) {
		// Successfully placed focus, clear selection.
		sel.setSelected(false);
		mSelectorRect.setEmpty();
		} else {
		// Failed to place focus, clear current (invalid) focus.
		final View focused = getFocusedChild();
		if (focused != null) {
		focused.clearFocus();
		}
		positionSelector(INVALID_POSITION, sel);
		} else {
		sel.setSelected(false);
		mSelectorRect.setEmpty();
		}
		} else {
		positionSelector(INVALID_POSITION, sel);
		}
		mSelectedTop = sel.getTop();
		} else {
		if (mTouchMode > TOUCH_MODE_DOWN && mTouchMode < TOUCH_MODE_SCROLL) {
		View child = getChildAt(mMotionPosition - mFirstPosition);
		if (child != null) positionSelector(mMotionPosition, child);
		// If the user's finger is down, select the motion position.
		// Otherwise, clear selection.
		if (mTouchMode == TOUCH_MODE_TAP \|\| mTouchMode == TOUCH_MODE_DONE_WAITING) {
		final View child = getChildAt(mMotionPosition - mFirstPosition);
		if (child != null) {
		positionSelector(mMotionPosition, child);
		}
		} else {
		mSelectedTop = 0;
		mSelectorRect.setEmpty();
		}

		// even if there is not selected position, we may need to restore
		// focus (i.e. something focusable in touch mode)
		if (hasFocus() && focusLayoutRestoreView != null) {
		focusLayoutRestoreView.requestFocus();
		}
		}

		// Attempt to restore accessibility focus.
		@@ -1753,11 +1726,8 @@ public class ListView extends AbsListView {
		}
		}

		// tell focus view we are done mucking with it, if it is still in
		// our view hierarchy.
		if (focusLayoutRestoreView != null
		&& focusLayoutRestoreView.getWindowToken() != null) {
		focusLayoutRestoreView.onFinishTemporaryDetach();
		if (focusedChild != null) {
		focusedChild.setHasTransientState(false);
		}

		mLayoutMode = LAYOUT_NORMAL;