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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.uimanager;
import android.support.v4.util.Pools;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.uimanager.events.Event;
import com.facebook.react.uimanager.events.RCTEventEmitter;
/**
* Event used to notify JS component about changes of its position or dimensions
*/
public class OnLayoutEvent extends Event {
private static final Pools.SynchronizedPool EVENTS_POOL =
new Pools.SynchronizedPool<>(20);
private int mX, mY, mWidth, mHeight;
public static OnLayoutEvent obtain(int viewTag, int x, int y, int width, int height) {
OnLayoutEvent event = EVENTS_POOL.acquire();
if (event == null) {
event = new OnLayoutEvent();
}
event.init(viewTag, x, y, width, height);
return event;
}
@Override
public void onDispose() {
EVENTS_POOL.release(this);
}
private OnLayoutEvent() {
}
protected void init(int viewTag, int x, int y, int width, int height) {
super.init(viewTag);
mX = x;
mY = y;
mWidth = width;
mHeight = height;
}
@Override
public String getEventName() {
return "topLayout";
}
@Override
public void dispatch(RCTEventEmitter rctEventEmitter) {
WritableMap layout = Arguments.createMap();
layout.putDouble("x", PixelUtil.toDIPFromPixel(mX));
layout.putDouble("y", PixelUtil.toDIPFromPixel(mY));
layout.putDouble("width", PixelUtil.toDIPFromPixel(mWidth));
layout.putDouble("height", PixelUtil.toDIPFromPixel(mHeight));
WritableMap event = Arguments.createMap();
event.putMap("layout", layout);
event.putInt("target", getViewTag());
rctEventEmitter.receiveEvent(getViewTag(), getEventName(), event);
}
}