Extend NonLockingScrollView to support adding/removing views (c7c0ad0b) · Commits · e / os / Mail

k9mail/src/main/java/com/fsck/k9/view/NonLockingScrollView.java

+35 −18

Original line number	Diff line number	Diff line
		@@ -100,25 +100,14 @@ public class NonLockingScrollView extends ScrollView {
		@Override
		protected void onFinishInflate() {
		super.onFinishInflate();
		excludeChildrenFromInterceptions(this);
		setupDelegationOfTouchAndHierarchyChangeEvents();
		}

		/**
		* Traverses the view tree for {@link WebView}s so they can be excluded from touch
		* interceptions and receive all events.
		*/
		private void excludeChildrenFromInterceptions(View node) {
		// If additional types of children should be excluded (e.g. horizontal scrolling banners),
		// this needs to be modified accordingly.
		if (node instanceof WebView) {
		mChildrenNeedingAllTouches.add(node);
		} else if (node instanceof ViewGroup) {
		ViewGroup viewGroup = (ViewGroup) node;
		final int childCount = viewGroup.getChildCount();
		for (int i = 0; i < childCount; i++) {
		final View child = viewGroup.getChildAt(i);
		excludeChildrenFromInterceptions(child);
		}
		private void setupDelegationOfTouchAndHierarchyChangeEvents() {
		OnHierarchyChangeListener listener = new HierarchyTreeChangeListener();
		setOnHierarchyChangeListener(listener);
		for (int i = 0, childCount = getChildCount(); i < childCount; i++) {
		listener.onChildViewAdded(this, getChildAt(i));
		}
		}

		@@ -167,4 +156,32 @@ public class NonLockingScrollView extends ScrollView {
		super.requestChildFocus(child, focused);
		}
		}

		class HierarchyTreeChangeListener implements OnHierarchyChangeListener {
		@Override
		public void onChildViewAdded(View parent, View child) {
		if (child instanceof WebView) {
		mChildrenNeedingAllTouches.add(child);
		} else if (child instanceof ViewGroup) {
		ViewGroup childGroup = (ViewGroup) child;
		childGroup.setOnHierarchyChangeListener(this);
		for (int i = 0, childCount = childGroup.getChildCount(); i < childCount; i++) {
		onChildViewAdded(childGroup, childGroup.getChildAt(i));
		}
		}
		}

		@Override
		public void onChildViewRemoved(View parent, View child) {
		if (child instanceof WebView) {
		mChildrenNeedingAllTouches.remove(child);
		} else if (child instanceof ViewGroup) {
		ViewGroup childGroup = (ViewGroup) child;
		for (int i = 0, childCount = childGroup.getChildCount(); i < childCount; i++) {
		onChildViewRemoved(childGroup, childGroup.getChildAt(i));
		}
		childGroup.setOnHierarchyChangeListener(null);
		}
		}
		}
		}