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Fix Issue 23870: Android API - View.getGlobalVisibleRect() does not properly clip result rect for ReactClippingViewGroups #26334

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Fix Issue 23870: Android API - View.getGlobalVisibleRect() does not properly clip result rect for ReactClippingViewGroups #26334

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6cf12aa
Initial attempt at fixing issue #23870 by overriding getChildVisibleR…
davidbiedenbach Sep 4, 2019
4a8359c
Ensure non-ReactViewGroup-derived ViewGroups will use the correct imp…
davidbiedenbach Sep 4, 2019
d5d8096
Merge remote-tracking branch 'origin/master' into issue_23870_fix
davidbiedenbach Sep 12, 2019
c33899c
Remove uncalled override of @hide marked API, add getChildVisibleRect…
davidbiedenbach Sep 12, 2019
85febce
remove unnecessary log statements
davidbiedenbach Sep 16, 2019
57383f6
One more getChildVisibleRect override was necessary to maintain recur…
davidbiedenbach Sep 16, 2019
149ef3e
Move replicated code into ReactClippingViewGroupHelper.java, missing …
davidbiedenbach Sep 18, 2019
ee4f12c
Clean up unused imports
davidbiedenbach Sep 18, 2019
587f26c
Merge branch 'master' into issue_23870_fix
davidbiedenbach Oct 4, 2019
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49 changes: 49 additions & 0 deletions ...oid/src/main/java/com/facebook/react/views/scroll/ReactHorizontalScrollContainerView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -6,10 +6,15 @@
package com.facebook.react.views.scroll;

import android.content.Context;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.HorizontalScrollView;
import androidx.core.view.ViewCompat;
import com.facebook.react.modules.i18nmanager.I18nUtil;
import com.facebook.react.uimanager.ViewProps;

/** Container of Horizontal scrollViews that supports RTL scrolling. */
public class ReactHorizontalScrollContainerView extends ViewGroup {
Expand Down Expand Up @@ -45,4 +50,48 @@ protected void onLayout(boolean changed, int left, int top, int right, int botto
}
mCurrentWidth = getWidth();
}

@Override
public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
// This is based on the Android ViewGroup implementation, modified to clip child rects
// if overflow is set to ViewProps.HIDDEN. This effectively solves Issue #23870 which
// appears to have been introduced by FLAG_CLIP_CHILDREN being forced false
// regardless of whether clipping is desired.
final RectF rect = new RectF();
rect.set(r);

child.getMatrix().mapRect(rect);

final int dx = child.getLeft() - getScrollX();
int dy = child.getTop() - getScrollY();

rect.offset(dx, dy);

if (offset != null) {
float[] position = new float[2];
position[0] = offset.x;
position[1] = offset.y;
child.getMatrix().mapPoints(position);
offset.x = Math.round(position[0]) + dx;
offset.y = Math.round(position[1]) + dy;
}

final int width = getRight() - getLeft();
final int height = getBottom() - getTop();

boolean rectIsVisible = true;

ViewParent parent = getParent();
if (parent == null) {
rectIsVisible = rect.intersect(0, 0, width, height);
}

r.set((int) Math.floor(rect.left), (int) Math.floor(rect.top),
(int) Math.ceil(rect.right), (int) Math.ceil(rect.bottom));

if (rectIsVisible && parent != null) {
rectIsVisible = parent.getChildVisibleRect(this, r, offset);
}
return rectIsVisible;
}
}
46 changes: 46 additions & 0 deletions ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactHorizontalScrollView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,15 @@
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.FocusFinder;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewParent;
import android.widget.HorizontalScrollView;
import android.widget.OverScroller;
import androidx.annotation.Nullable;
Expand Down Expand Up @@ -491,6 +493,50 @@ public void getClippingRect(Rect outClippingRect) {
outClippingRect.set(Assertions.assertNotNull(mClippingRect));
}

@Override
public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
// This is based on the Android ViewGroup implementation, modified to clip child rects
// if overflow is set to ViewProps.HIDDEN. This effectively solves Issue #23870 which
// appears to have been introduced by FLAG_CLIP_CHILDREN being forced false
// regardless of whether clipping is desired.
final RectF rect = new RectF();
rect.set(r);

child.getMatrix().mapRect(rect);

final int dx = child.getLeft() - getScrollX();
int dy = child.getTop() - getScrollY();

rect.offset(dx, dy);

if (offset != null) {
float[] position = new float[2];
position[0] = offset.x;
position[1] = offset.y;
child.getMatrix().mapPoints(position);
offset.x = Math.round(position[0]) + dx;
offset.y = Math.round(position[1]) + dy;
}

final int width = getRight() - getLeft();
final int height = getBottom() - getTop();

boolean rectIsVisible = true;

ViewParent parent = getParent();
if (parent == null || ViewProps.HIDDEN.equals(mOverflow)) {
rectIsVisible = rect.intersect(0, 0, width, height);
}

r.set((int) Math.floor(rect.left), (int) Math.floor(rect.top),
(int) Math.ceil(rect.right), (int) Math.ceil(rect.bottom));

if (rectIsVisible && parent != null) {
rectIsVisible = parent.getChildVisibleRect(this, r, offset);
}
return rectIsVisible;
}

private int getSnapInterval() {
if (mSnapInterval != 0) {
return mSnapInterval;
Expand Down
46 changes: 46 additions & 0 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 @@ -9,13 +9,15 @@
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.OverScroller;
import android.widget.ScrollView;
import androidx.annotation.Nullable;
Expand Down Expand Up @@ -342,6 +344,50 @@ public void getClippingRect(Rect outClippingRect) {
outClippingRect.set(Assertions.assertNotNull(mClippingRect));
}

@Override
public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
// This is based on the Android ViewGroup implementation, modified to clip child rects
// if overflow is set to ViewProps.HIDDEN. This effectively solves Issue #23870 which
// appears to have been introduced by FLAG_CLIP_CHILDREN being forced false
// regardless of whether clipping is desired.
final RectF rect = new RectF();
rect.set(r);

child.getMatrix().mapRect(rect);

final int dx = child.getLeft() - getScrollX();
int dy = child.getTop() - getScrollY();

rect.offset(dx, dy);

if (offset != null) {
float[] position = new float[2];
position[0] = offset.x;
position[1] = offset.y;
child.getMatrix().mapPoints(position);
offset.x = Math.round(position[0]) + dx;
offset.y = Math.round(position[1]) + dy;
}

final int width = getRight() - getLeft();
final int height = getBottom() - getTop();

boolean rectIsVisible = true;

ViewParent parent = getParent();
if (parent == null || ViewProps.HIDDEN.equals(mOverflow)) {
rectIsVisible = rect.intersect(0, 0, width, height);
}

r.set((int) Math.floor(rect.left), (int) Math.floor(rect.top),
(int) Math.ceil(rect.right), (int) Math.ceil(rect.bottom));

if (rectIsVisible && parent != null) {
rectIsVisible = parent.getChildVisibleRect(this, r, offset);
}
return rectIsVisible;
}

@Override
public void fling(int velocityY) {
// Workaround.
Expand Down
45 changes: 45 additions & 0 deletions ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewGroup.java
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Expand Up @@ -24,6 +24,7 @@
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.ViewStructure;
import android.view.animation.Animation;
import androidx.annotation.NonNull;
Expand Down Expand Up @@ -455,6 +456,50 @@ private void updateSubviewClipStatus(View subview) {
}
}

@Override
public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
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I think you ought to override the method flavor that has the forceParentCheck param and take it into account. It's pretty easy to add, isn't it?

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@d4vidi
I wanted to, but since the original for that flavor has @hide in the comment, it's not available to override. I tried implementing it anyway, but when the ViewGroup implementation tries to call it (via a cast) it never reaches the subclass implementation anyway :(

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See https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/view/ViewGroup.java#6185

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Apparently, the ViewGroup implementation of getChildVisibleRect() is the only one that calls into an auxiliary function to force recursion when not necessary. It seems it was written for some kind of internal testing, and then marked @hide to prevent it from being used by the public.

// This is based on the Android ViewGroup implementation, modified to clip child rects
// if overflow is set to ViewProps.HIDDEN. This effectively solves Issue #23870 which
// appears to have been introduced by FLAG_CLIP_CHILDREN being forced false
// regardless of whether clipping is desired.
final RectF rect = new RectF();
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@davidbiedenbach why give up on android's optimizations, such as:
https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/view/ViewGroup.java#6192
and:
https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/view/ViewGroup.java#6195

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@davidbiedenbach davidbiedenbach Sep 18, 2019 •
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@d4vidi I tried to do it that way at first, but unfortunately this class doesn't have access to the superclass members required to use those optimizations. Especially without some getters that weren't introduced until Android API 18 (don't want to break 16 for RN users unnecessarily)

rect.set(r);

child.getMatrix().mapRect(rect);

final int dx = child.getLeft() - getScrollX();
int dy = child.getTop() - getScrollY();
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final this too? :)

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@davidbiedenbach davidbiedenbach Sep 18, 2019 •
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Oops. Must have been a copy-paste error (I was comparing against different versions of the Android implementations) ;-).


rect.offset(dx, dy);

if (offset != null) {
float[] position = new float[2];
position[0] = offset.x;
position[1] = offset.y;
child.getMatrix().mapPoints(position);
offset.x = Math.round(position[0]) + dx;
offset.y = Math.round(position[1]) + dy;
}

final int width = getRight() - getLeft();
final int height = getBottom() - getTop();

boolean rectIsVisible = true;

ViewParent parent = getParent();
if (parent == null || ViewProps.HIDDEN.equals(mOverflow)) {
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🎉

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The magic line ;-)

rectIsVisible = rect.intersect(0, 0, width, height);
}
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@d4vidi d4vidi Sep 18, 2019 •
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What's about the FLAG_CLIP_TO_PADDING - should you not keep that test as well?
ref: https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/view/ViewGroup.java#6229
Perhaps this is a question for @yungsters, as I'm not sure whether its usage is legit anywhere in RN

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@davidbiedenbach davidbiedenbach Sep 18, 2019 •
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@d4vidi, yeah I considered that too, but again due to access level, it didn't appear to be possible.


r.set((int) Math.floor(rect.left), (int) Math.floor(rect.top),
(int) Math.ceil(rect.right), (int) Math.ceil(rect.bottom));

if (rectIsVisible && parent != null) {
rectIsVisible = parent.getChildVisibleRect(this, r, offset);
}
return rectIsVisible;
}

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Last but not least -- lot's of code duplication here... how about exporting all of this to an external util of some sort?

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I agree entirely. Was torn on this as well but decided to go with this way to get feedback first. I suppose I can always pass the value of mOverflow or any other dependencies.

ReactClippingViewGroupHelper.java seems like a good candidate for such a function. I'll take a look.

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
Expand Down