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A framework for building native apps with React
/**
* 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.views.art;
import javax.annotation.Nullable;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Color;
import android.view.Surface;
import android.graphics.PorterDuff;
import android.graphics.SurfaceTexture;
import android.view.TextureView;
import com.facebook.common.logging.FLog;
import com.facebook.react.common.ReactConstants;
import com.facebook.react.uimanager.LayoutShadowNode;
import com.facebook.react.uimanager.UIViewOperationQueue;
import com.facebook.react.uimanager.ReactShadowNode;
/**
* Shadow node for ART virtual tree root - ARTSurfaceView
*/
public class ARTSurfaceViewShadowNode extends LayoutShadowNode
implements TextureView.SurfaceTextureListener {
private @Nullable Surface mSurface;
@Override
public boolean isVirtual() {
return false;
}
@Override
public boolean isVirtualAnchor() {
return true;
}
@Override
public void onCollectExtraUpdates(UIViewOperationQueue uiUpdater) {
super.onCollectExtraUpdates(uiUpdater);
drawOutput();
uiUpdater.enqueueUpdateExtraData(getReactTag(), this);
}
private void drawOutput() {
if (mSurface == null || !mSurface.isValid()) {
markChildrenUpdatesSeen(this);
return;
}
try {
Canvas canvas = mSurface.lockCanvas(null);
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
Paint paint = new Paint();
for (int i = 0; i < getChildCount(); i++) {
ARTVirtualNode child = (ARTVirtualNode) getChildAt(i);
child.draw(canvas, paint, 1f);
child.markUpdateSeen();
}
if (mSurface == null) {
return;
}
mSurface.unlockCanvasAndPost(canvas);
} catch (IllegalArgumentException | IllegalStateException e) {
FLog.e(ReactConstants.TAG, e.getClass().getSimpleName() + " in Surface.unlockCanvasAndPost");
}
}
private void markChildrenUpdatesSeen(ReactShadowNode shadowNode) {
for (int i = 0; i < shadowNode.getChildCount(); i++) {
ReactShadowNode child = shadowNode.getChildAt(i);
child.markUpdateSeen();
markChildrenUpdatesSeen(child);
}
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
mSurface = new Surface(surface);
drawOutput();
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
surface.release();
mSurface = null;
return true;
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {}
}