/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
package com.facebook.react.flat;
import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.List;
import android.util.SparseArray;
import android.util.SparseIntArray;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import com.facebook.react.uimanager.NativeViewHierarchyManager;
import com.facebook.react.uimanager.SizeMonitoringFrameLayout;
import com.facebook.react.uimanager.ThemedReactContext;
import com.facebook.react.uimanager.ViewGroupManager;
import com.facebook.react.uimanager.ViewManagerRegistry;
/**
* FlatNativeViewHierarchyManager is the only class that performs View manipulations. All of this
* class methods can only be called from UI thread by {@link FlatUIViewOperationQueue}.
*/
/* package */ final class FlatNativeViewHierarchyManager extends NativeViewHierarchyManager
implements ViewResolver {
/* package */ FlatNativeViewHierarchyManager(ViewManagerRegistry viewManagers) {
super(viewManagers, new FlatRootViewManager());
}
@Override
public View getView(int reactTag) {
return super.resolveView(reactTag);
}
@Override
public void addRootView(
int tag,
SizeMonitoringFrameLayout view,
ThemedReactContext themedContext) {
FlatViewGroup root = new FlatViewGroup(themedContext);
view.addView(root);
// When unmounting, ReactInstanceManager.detachViewFromInstance() will check id of the
// top-level View (SizeMonitoringFrameLayout) and pass it back to JS. We want that View's id to
// be set, otherwise NativeViewHierarchyManager will not be able to cleanup properly.
view.setId(tag);
addRootViewGroup(tag, root, themedContext);
}
/**
* Updates DrawCommands and AttachDetachListeners of a FlatViewGroup specified by a reactTag.
*
* @param reactTag reactTag to lookup FlatViewGroup by
* @param drawCommands if non-null, new draw commands to execute during the drawing.
* @param listeners if non-null, new attach-detach listeners.
*/
/* package */ void updateMountState(
int reactTag,
@Nullable DrawCommand[] drawCommands,
@Nullable AttachDetachListener[] listeners,
@Nullable NodeRegion[] nodeRegions) {
FlatViewGroup view = (FlatViewGroup) resolveView(reactTag);
if (drawCommands != null) {
view.mountDrawCommands(drawCommands);
}
if (listeners != null) {
view.mountAttachDetachListeners(listeners);
}
if (nodeRegions != null) {
view.mountNodeRegions(nodeRegions);
}
}
/**
* Updates DrawCommands and AttachDetachListeners of a clipping FlatViewGroup specified by a
* reactTag.
*
* @param reactTag The react tag to lookup FlatViewGroup by.
* @param drawCommands If non-null, new draw commands to execute during the drawing.
* @param drawViewIndexMap Mapping of react tags to the index of the corresponding DrawView
* command in the draw command array.
* @param commandMaxBot At each index i, the maximum bottom value (or right value in the case of
* horizontal clipping) value of all draw commands at or below i.
* @param commandMinTop At each index i, the minimum top value (or left value in the case of
* horizontal clipping) value of all draw commands at or below i.
* @param listeners If non-null, new attach-detach listeners.
* @param nodeRegions Node regions to mount.
* @param regionMaxBot At each index i, the maximum bottom value (or right value in the case of
* horizontal clipping) value of all node regions at or below i.
* @param regionMinTop At each index i, the minimum top value (or left value in the case of
* horizontal clipping) value of all draw commands at or below i.
* @param willMountViews Whether we are going to also send a mountViews command in this state
* cycle.
*/
/* package */ void updateClippingMountState(
int reactTag,
@Nullable DrawCommand[] drawCommands,
SparseIntArray drawViewIndexMap,
float[] commandMaxBot,
float[] commandMinTop,
@Nullable AttachDetachListener[] listeners,
@Nullable NodeRegion[] nodeRegions,
float[] regionMaxBot,
float[] regionMinTop,
boolean willMountViews) {
FlatViewGroup view = (FlatViewGroup) resolveView(reactTag);
if (drawCommands != null) {
view.mountClippingDrawCommands(
drawCommands,
drawViewIndexMap,
commandMaxBot,
commandMinTop,
willMountViews);
}
if (listeners != null) {
view.mountAttachDetachListeners(listeners);
}
if (nodeRegions != null) {
view.mountClippingNodeRegions(nodeRegions, regionMaxBot, regionMinTop);
}
}
/* package */ void updateViewGroup(int reactTag, int[] viewsToAdd, int[] viewsToDetach) {
View view = resolveView(reactTag);
if (view instanceof FlatViewGroup) {
((FlatViewGroup) view).mountViews(this, viewsToAdd, viewsToDetach);
return;
}
ViewGroup viewGroup = (ViewGroup) view;
ViewGroupManager viewManager = (ViewGroupManager) resolveViewManager(reactTag);
List<View> listOfViews = new ArrayList<>(viewsToAdd.length);
// batch the set of additions - some view managers can take advantage of the batching to
// decrease operations, etc.
for (int viewIdToAdd : viewsToAdd) {
int tag = Math.abs(viewIdToAdd);
listOfViews.add(resolveView(tag));
}
viewManager.addViews(viewGroup, listOfViews);
}
/**
* Updates View bounds, possibly re-measuring and re-layouting it if the size changed.
*
* @param reactTag reactTag to lookup a View by
* @param left left coordinate relative to parent
* @param top top coordinate relative to parent
* @param right right coordinate relative to parent
* @param bottom bottom coordinate relative to parent
*/
/* package */ void updateViewBounds(int reactTag, int left, int top, int right, int bottom) {
View view = resolveView(reactTag);
int width = right - left;
int height = bottom - top;
if (view.getWidth() != width || view.getHeight() != height) {
// size changed, we need to measure and layout the View
view.measure(
MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
view.layout(left, top, right, bottom);
} else {
// same size, only location changed, there is a faster route.
view.offsetLeftAndRight(left - view.getLeft());
view.offsetTopAndBottom(top - view.getTop());
}
}
/* package */ void setPadding(
int reactTag,
int paddingLeft,
int paddingTop,
int paddingRight,
int paddingBottom) {
resolveView(reactTag).setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
}
/* package */ void dropViews(SparseIntArray viewsToDrop) {
for (int i = 0, count = viewsToDrop.size(); i < count; i++) {
int viewToDrop = viewsToDrop.keyAt(i);
View view = null;
if (viewToDrop > 0) {
try {
view = resolveView(viewToDrop);
dropView(view);
} catch (Exception e) {
// the view is already dropped, nothing we can do
}
} else {
// Root views are noted with a negative tag from StateBuilder.
removeRootView(-viewToDrop);
}
int parentTag = viewsToDrop.valueAt(i);
// this only happens for clipped, non-root views - clipped because there is no parent, and
// not a root view (because we explicitly pass -1 for root views).
if (parentTag > 0 && view != null && view.getParent() == null) {
// this can only happen if the parent exists (if the parent were removed first, it'd also
// remove the child, so trying to explicitly remove the child afterwards would crash at
// the resolveView call above) - we also explicitly check for a null parent, implying that
// we are either clipped (or that we already removed the child from its parent, in which
// case this will essentially be a no-op).
View parent = resolveView(parentTag);
if (parent instanceof FlatViewGroup) {
((FlatViewGroup) parent).onViewDropped(view);
}
}
}
}
@Override
protected void dropView(View view) {
super.dropView(view);
// As a result of removeClippedSubviews, some views have strong references but are not attached
// to a parent. consequently, when the parent gets removed, these Views don't get cleaned up,
// because they aren't children (they also aren't removed from mTagsToViews, thus causing a
// leak). To solve this, we ask for said detached views and explicitly drop them.
if (view instanceof FlatViewGroup) {
FlatViewGroup flatViewGroup = (FlatViewGroup) view;
if (flatViewGroup.getRemoveClippedSubviews()) {
SparseArray<View> detachedViews = flatViewGroup.getDetachedViews();
for (int i = 0, size = detachedViews.size(); i < size; i++) {
View detachedChild = detachedViews.valueAt(i);
try {
dropView(detachedChild);
} catch (Exception e) {
// if the view is already dropped, ignore any exceptions
// in reality, we should find out the edge cases that cause
// this to happen and properly fix them.
}
// trigger onDetachedFromWindow and clean up this detached/clipped view
flatViewGroup.removeDetachedView(detachedChild);
}
}
}
}
/* package */ void detachAllChildrenFromViews(int[] viewsToDetachAllChildrenFrom) {
for (int viewTag : viewsToDetachAllChildrenFrom) {
View view = resolveView(viewTag);
if (view instanceof FlatViewGroup) {
((FlatViewGroup) view).detachAllViewsFromParent();
continue;
}
ViewGroup viewGroup = (ViewGroup) view;
ViewGroupManager viewManager = (ViewGroupManager) resolveViewManager(viewTag);
viewManager.removeAllViews(viewGroup);
}
}
}