Restore accessibility focus after ListView layout. (30ee76cf) · Commits · e / os / android_frameworks_base

core/java/android/widget/ListView.java

+56 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@ import android.graphics.PixelFormat;
		import android.graphics.Rect;
		import android.graphics.drawable.Drawable;
		import android.util.AttributeSet;
		import android.util.MathUtils;
		import android.util.SparseBooleanArray;
		import android.view.FocusFinder;
		import android.view.KeyEvent;
		@@ -1490,6 +1491,10 @@ public class ListView extends AbsListView {

		View focusLayoutRestoreView = null;

		AccessibilityNodeInfo accessibilityFocusLayoutRestoreNode = null;
		View accessibilityFocusLayoutRestoreView = null;
		int accessibilityFocusPosition = INVALID_POSITION;

		// Remember stuff we will need down below
		switch (mLayoutMode) {
		case LAYOUT_SET_SELECTION:
		@@ -1584,6 +1589,25 @@ public class ListView extends AbsListView {
		requestFocus();
		}

		// Remember which child, if any, had accessibility focus.
		final View accessFocusedView = getViewRootImpl().getAccessibilityFocusedHost();
		if (accessFocusedView != null) {
		final View accessFocusedChild = findAccessibilityFocusedChild(accessFocusedView);
		if (accessFocusedChild != null) {
		if (!dataChanged \|\| isDirectChildHeaderOrFooter(accessFocusedChild)) {
		// If the views won't be changing, try to maintain focus
		// on the current view host and (if applicable) its
		// virtual view.
		accessibilityFocusLayoutRestoreView = accessFocusedView;
		accessibilityFocusLayoutRestoreNode = getViewRootImpl()
		.getAccessibilityFocusedVirtualView();
		} else {
		// Otherwise, try to maintain focus at the same position.
		accessibilityFocusPosition = getPositionForView(accessFocusedChild);
		}
		}
		}

		// Clear out old views
		detachAllViewsFromParent();
		recycleBin.removeSkippedScrap();
		@@ -1682,6 +1706,22 @@ public class ListView extends AbsListView {
		}
		}

		// Attempt to restore accessibility focus.
		if (accessibilityFocusLayoutRestoreNode != null) {
		accessibilityFocusLayoutRestoreNode.performAction(
		AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
		} else if (accessibilityFocusLayoutRestoreView != null) {
		accessibilityFocusLayoutRestoreView.requestAccessibilityFocus();
		} else if (accessibilityFocusPosition != INVALID_POSITION) {
		// Bound the position within the visible children.
		final int position = MathUtils.constrain(
		(accessibilityFocusPosition - mFirstPosition), 0, (getChildCount() - 1));
		final View restoreView = getChildAt(position);
		if (restoreView != null) {
		restoreView.requestAccessibilityFocus();
		}
		}

		// tell focus view we are done mucking with it, if it is still in
		// our view hierarchy.
		if (focusLayoutRestoreView != null
		@@ -1712,6 +1752,22 @@ public class ListView extends AbsListView {
		}
		}

		/**
		* @param focusedView the view that has accessibility focus.
		* @return the direct child that contains accessibility focus.
		*/
		private View findAccessibilityFocusedChild(View focusedView) {
		ViewParent viewParent = focusedView.getParent();
		while ((viewParent instanceof View) && (viewParent != this)) {
		focusedView = (View) viewParent;
		viewParent = viewParent.getParent();
		}
		if (!(viewParent instanceof View)) {
		return null;
		}
		return focusedView;
		}

		/**
		* @param child a direct child of this list.
		* @return Whether child is a header or footer view.