if (
descendantFocusability != FOCUS_AFTER_DESCENDANTS ||
// No focusable descendants
(focusableCount == views.size())) {
// Note that we can't call the superclass here, because it will
// add all views in. So we need to do the same thing View does.
if (!isFocusable()) {
return;
}
if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE &&
isInTouchMode() && !isFocusableInTouchMode()) {
return;
}
if (views != null) {
views.add(this);
}
}
}
/**
* We only want the current page that is being shown to be touchable.
*/
@Override
public void addTouchables(ArrayList<View> views) {
// Note that we don't call super.addTouchables(), which means that
// we don't call View.addTouchables(). This is okay because a ViewPager
// is itself not touchable.
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == VISIBLE) {
ItemInfo ii = infoForChild(child);
if (ii != null && ii.position == mCurItem) {
child.addTouchables(views);
}
}
}
}
/**
* We only want the current page that is being shown to be focusable.
*/
@Override
protected boolean onRequestFocusInDescendants(int direction,
Rect previouslyFocusedRect) {
int index;
int increment;
int end;
int count = getChildCount();
if ((direction & FOCUS_FORWARD) != 0) {
index = 0;
increment = 1;
end = count;
} else {
index = count - 1;
increment = -1;
end = -1;
}
for (int i = index; i != end; i += increment) {
View child = getChildAt(i);
if (child.getVisibility() == VISIBLE) {
ItemInfo ii = infoForChild(child);
if (ii != null && ii.position == mCurItem) {
if (child.requestFocus(direction, previouslyFocusedRect)) {
return true;
}
}
}
}
return false;
}
@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
// Dispatch scroll events from this ViewPager.
if (event.getEventType() == AccessibilityEventCompat.TYPE_VIEW_SCROLLED) {
return super.dispatchPopulateAccessibilityEvent(event);
}
// Dispatch all other accessibility events from the current page.
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == VISIBLE) {
final ItemInfo ii = infoForChild(child);
if (ii != null && ii.position == mCurItem &&
child.dispatchPopulateAccessibilityEvent(event)) {
return true;
}
}
}
return false;
}
@Override
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
return new LayoutParams();
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return generateDefaultLayoutParams();
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams && super.checkLayoutParams(p);
}
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}
class MyAccessibilityDelegate extends AccessibilityDelegateCompat {
@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(host, event);
event.setClassName(ViewPager.class.getName());
final AccessibilityRecordCompat recordCompat = AccessibilityRecordCompat.obtain();
recordCompat.setScrollable(canScroll());
if (event.getEventType() == AccessibilityEventCompat.TYPE_VIEW_SCROLLED
&& mAdapter != null) {
recordCompat.setItemCount(mAdapter.getCount());
recordCompat.setFromIndex(mCurItem);
recordCompat.setToIndex(mCurItem);
}
}
@Override
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
super.onInitializeAccessibilityNodeInfo(host, info);
info.setClassName(ViewPager.class.getName());
info.setScrollable(canScroll());
if (internalCanScrollVertically(1)) {
info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD);
}
if (internalCanScrollVertically(-1)) {
info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD);
}
}
@Override
public boolean performAccessibilityAction(View host, int action, Bundle args) {
if (super.performAccessibilityAction(host, action, args)) {
return true;
}
switch (action) {
case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: {
if (internalCanScrollVertically(1)) {
setCurrentItem(mCurItem + 1);
return true;
}
}
return false;
case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: {
if (internalCanScrollVertically(-1)) {
setCurrentItem(mCurItem - 1);
return true;
}
}
return false;
}
return false;
}
private boolean canScroll() {
return (mAdapter != null) && (mAdapter.getCount() > 1);
}
}
private class PagerObserver extends DataSetObserver {
@Override
public void onChanged() {
dataSetChanged();
}
@Override
public void onInvalidated() {
dataSetChanged();
}
}
/**
* Layout parameters that should be supplied for views added to a
* ViewPager.
*/
public static class LayoutParams extends ViewGroup.LayoutParams {
/**
* true if this view is a decoration on the pager itself and not
* a view supplied by the adapter.
*/
public boolean isDecor;
/**
* Gravity setting for use on decor views only:
* Where to position the view page within the overall ViewPager
* container; constants are defined in {@link Gravity}.
*/
public int gravity;
/**
* Width as a 0-1 multiplier of the measured pager width
*/
float heightFactor = 0.f;
/**
* true if this view was added during layout and needs to be measured
* before being positioned.
*/
boolean needsMeasure;
/**
* Adapter position this view is for if !isDecor
*/
int position;
/**
* Current child index within the ViewPager that this view occupies
*/
int childIndex;
public LayoutParams() {
super(FILL_PARENT, FILL_PARENT);
}
public LayoutParams(Context context, AttributeSet attrs) {
super(context, attrs);
final TypedArray a = context.obtainStyledAttributes(attrs, LAYOUT_ATTRS);
gravity = a.getInteger(0, Gravity.TOP);
a.recycle();
}
}
static class ViewPositionComparator implements Comparator<View> {
@Override
public int compare(View lhs, View rhs) {
final LayoutParams llp = (LayoutParams) lhs.getLayoutParams();
final LayoutParams rlp = (LayoutParams) rhs.getLayoutParams();
if (llp.isDecor != rlp.isDecor) {
return llp.isDecor ? 1 : -1;
}
return llp.position - rlp.position;
}
}
}
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