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Implementation of fabOnReact/react-native-notes#6 (comment)
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@fabOnReact
fabOnReact committed Feb 15, 2022
1 parent 7977776 commit 048c5b9
Showing 1 changed file with 90 additions and 71 deletions.
161 changes: 90 additions & 71 deletions ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -24,8 +24,8 @@
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.OverScroller;
import android.widget.ScrollView;
import androidx.annotation.Nullable;
Expand All @@ -35,15 +35,11 @@
import com.facebook.common.logging.FLog;
import com.facebook.infer.annotation.Assertions;
import com.facebook.react.R;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReadableMap;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.bridge.WritableNativeMap;
import com.facebook.react.common.ReactConstants;
import com.facebook.react.uimanager.FabricViewStateManager;
import com.facebook.react.uimanager.MeasureSpecAssertions;
import com.facebook.react.uimanager.PointerEvents;
import com.facebook.react.uimanager.PixelUtil;
import com.facebook.react.uimanager.ReactAccessibilityDelegate;
import com.facebook.react.uimanager.ReactClippingViewGroup;
import com.facebook.react.uimanager.ReactClippingViewGroupHelper;
Expand Down Expand Up @@ -118,12 +114,11 @@ public ReactScrollView(Context context) {
this(context, null);
}

private View getContentView() {
private View getContentView() {
View contentView = getChildAt(0);
return contentView;
}


public ReactScrollView(Context context, @Nullable FpsListener fpsListener) {
super(context);
mFpsListener = fpsListener;
Expand All @@ -134,91 +129,103 @@ public ReactScrollView(Context context, @Nullable FpsListener fpsListener) {
setScrollBarStyle(SCROLLBARS_OUTSIDE_OVERLAY);

ViewCompat.setAccessibilityDelegate(
this,
new AccessibilityDelegateCompat() {

@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(host, event);
event.setScrollable(mScrollEnabled);
final ReadableMap accessibilityCollectionInfo = (ReadableMap) host.getTag(R.id.accessibility_collection_info);

if (accessibilityCollectionInfo != null) {
event.setItemCount(accessibilityCollectionInfo.getInt("itemCount"));
View contentView = getContentView();
Integer firstVisibleIndex = null;
Integer lastVisibleIndex = null;

if (!(contentView instanceof ViewGroup)) {
return;
}
this,
new AccessibilityDelegateCompat() {

for(int index = 0; index < ((ViewGroup) contentView).getChildCount(); index++) {
View nextChild = ((ViewGroup) contentView).getChildAt(index);
boolean isVisible = isPartiallyScrolledInView(nextChild);

ReadableMap accessibilityCollectionItemInfo = (ReadableMap) nextChild.getTag(R.id.accessibility_collection_item_info);

if (!(nextChild instanceof ViewGroup)) {
@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(host, event);
event.setScrollable(mScrollEnabled);
// if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED) {
final ReadableMap accessibilityCollectionInfo =
(ReadableMap) host.getTag(R.id.accessibility_collection_info);
FLog.w("TESTING::ReactScrollView", "event.getEventType(): " + (event.getEventType()));

if (accessibilityCollectionInfo != null) {
event.setItemCount(accessibilityCollectionInfo.getInt("itemCount"));
View contentView = getContentView();
Integer firstVisibleIndex = null;
Integer lastVisibleIndex = null;

if (!(contentView instanceof ViewGroup)) {
return;
}

int childCount = ((ViewGroup) nextChild).getChildCount();
for (int index = 0; index < ((ViewGroup) contentView).getChildCount(); index++) {
View nextChild = ((ViewGroup) contentView).getChildAt(index);

// If this child's accessibilityCollectionItemInfo is null, we'll check one more nested child.
// Happens when getItemLayout is not passed in FlatList which adds an additional View in the hierarchy.
if (childCount > 0 && accessibilityCollectionItemInfo == null) {
View nestedNextChild = ((ViewGroup) nextChild).getChildAt(0);
if (nestedNextChild != null) {
ReadableMap nestedChildAccessibilityInfo = (ReadableMap) nestedNextChild.getTag(R.id.accessibility_collection_item_info);
if (nestedChildAccessibilityInfo != null) {
accessibilityCollectionItemInfo = nestedChildAccessibilityInfo;
}
ReadableMap accessibilityCollectionItemInfo =
(ReadableMap) nextChild.getTag(R.id.accessibility_collection_item_info);

if (!(nextChild instanceof ViewGroup)) {
return;
}
}

if (isVisible == true && accessibilityCollectionItemInfo != null) {
if(firstVisibleIndex == null) {
firstVisibleIndex = accessibilityCollectionItemInfo.getInt("itemIndex");
int childCount = ((ViewGroup) nextChild).getChildCount();
if (childCount > 0 && accessibilityCollectionItemInfo == null) {
for (int child = 0; child < childCount; child++) {
View nestedNextChild = ((ViewGroup) nextChild).getChildAt(child);
if (nestedNextChild != null) {
ReadableMap nestedChildAccessibilityInfo =
(ReadableMap)
nestedNextChild.getTag(R.id.accessibility_collection_item_info);
if (nestedChildAccessibilityInfo != null
&& isPartiallyScrolledInView(nestedNextChild)) {
int currentIndex = nestedChildAccessibilityInfo.getInt("itemIndex");
if (firstVisibleIndex == null || firstVisibleIndex > currentIndex) {
firstVisibleIndex = (int) currentIndex;
}
if (currentIndex == 1) {
FLog.w("TESTING::ReactScrollView", "currentIndex: " + (currentIndex));
FLog.w(
"TESTING::ReactScrollView",
"firstVisibleIndex: " + (firstVisibleIndex));
}
if (lastVisibleIndex == null || lastVisibleIndex < currentIndex) {
lastVisibleIndex = (int) currentIndex;
}
}
}
}
}
lastVisibleIndex = accessibilityCollectionItemInfo.getInt("itemIndex");;
}

if (firstVisibleIndex != null && lastVisibleIndex != null) {
event.setFromIndex(firstVisibleIndex);
event.setToIndex(lastVisibleIndex);
}
}
// }
}
}

@Override
public void onInitializeAccessibilityNodeInfo(
View host, AccessibilityNodeInfoCompat info) {
super.onInitializeAccessibilityNodeInfo(host, info);

final ReactAccessibilityDelegate.AccessibilityRole accessibilityRole =
(ReactAccessibilityDelegate.AccessibilityRole) host.getTag(R.id.accessibility_role);
@Override
public void onInitializeAccessibilityNodeInfo(
View host, AccessibilityNodeInfoCompat info) {
super.onInitializeAccessibilityNodeInfo(host, info);

if (accessibilityRole != null) {
ReactAccessibilityDelegate.setRole(info, accessibilityRole, host.getContext());
}
final ReactAccessibilityDelegate.AccessibilityRole accessibilityRole =
(ReactAccessibilityDelegate.AccessibilityRole) host.getTag(R.id.accessibility_role);

final ReadableMap accessibilityCollectionInfo = (ReadableMap) host.getTag(R.id.accessibility_collection_info);
if (accessibilityRole != null) {
ReactAccessibilityDelegate.setRole(info, accessibilityRole, host.getContext());
}

if (accessibilityCollectionInfo != null) {
int rowCount = accessibilityCollectionInfo.getInt("rowCount");
int columnCount = accessibilityCollectionInfo.getInt("columnCount");
boolean hierarchical = accessibilityCollectionInfo.getBoolean("hierarchical");
final ReadableMap accessibilityCollectionInfo =
(ReadableMap) host.getTag(R.id.accessibility_collection_info);

AccessibilityNodeInfoCompat.CollectionInfoCompat collectionInfoCompat = AccessibilityNodeInfoCompat.CollectionInfoCompat.obtain(rowCount, columnCount, hierarchical);
info.setCollectionInfo(collectionInfoCompat);
}
if (accessibilityCollectionInfo != null) {
int rowCount = accessibilityCollectionInfo.getInt("rowCount");
int columnCount = accessibilityCollectionInfo.getInt("columnCount");
boolean hierarchical = accessibilityCollectionInfo.getBoolean("hierarchical");

info.setScrollable(mScrollEnabled);
}
});
AccessibilityNodeInfoCompat.CollectionInfoCompat collectionInfoCompat =
AccessibilityNodeInfoCompat.CollectionInfoCompat.obtain(
rowCount, columnCount, hierarchical);
info.setCollectionInfo(collectionInfoCompat);
}

info.setScrollable(mScrollEnabled);
}
});
}

@Override
Expand Down Expand Up @@ -404,11 +411,23 @@ private int getScrollDelta(View descendent) {
return computeScrollDeltaToGetChildRectOnScreen(mTempRect);
}

/** Returns whether the given descendent is scrolled fully in view */
private boolean isScrolledInView(View descendent) {
return getScrollDelta(descendent) == 0;
}

/** Returns whether the given descendent is partially scrolled in view */
private boolean isPartiallyScrolledInView(View descendent) {
int scrollDelta = getScrollDelta(descendent);
descendent.getDrawingRect(mTempRect);
return scrollDelta != 0 && Math.abs(scrollDelta) < mTempRect.width();
return scrollDelta != 0 && Math.abs(scrollDelta) < mTempRect.height();
}

/** Returns whether the given descendent is "mostly" (>50%) scrolled in view */
private boolean isMostlyScrolledInView(View descendent) {
int scrollDelta = getScrollDelta(descendent);
descendent.getDrawingRect(mTempRect);
return scrollDelta != 0 && Math.abs(scrollDelta) < (mTempRect.height() / 2);
}

private void scrollToChild(View child) {
Expand Down

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