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Extend NonLockingScrollView to support adding/removing views

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Fixes #1908
This commit is contained in:
cketti 2017-01-09 23:46:28 +01:00
parent d344a6898d
commit c7c0ad0b7b
1 changed files with 35 additions and 18 deletions
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53
k9mail/src/main/java/com/fsck/k9/view/NonLockingScrollView.java
View file

@ -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);
}
}
}
}