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package com.mapbox.mapboxsdk.maps;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.IntDef;
import android.support.annotation.NonNull;
import java.lang.annotation.Retention;
import java.lang.ref.WeakReference;
import java.util.concurrent.CopyOnWriteArrayList;
import static com.mapbox.mapboxsdk.maps.MapboxMap.OnCameraIdleListener;
import static com.mapbox.mapboxsdk.maps.MapboxMap.OnCameraMoveCanceledListener;
import static com.mapbox.mapboxsdk.maps.MapboxMap.OnCameraMoveListener;
import static com.mapbox.mapboxsdk.maps.MapboxMap.OnCameraMoveStartedListener;
import static java.lang.annotation.RetentionPolicy.SOURCE;
/**
* Class responsible for dispatching camera change events to registered listeners.
*/
class CameraChangeDispatcher implements MapboxMap.OnCameraMoveStartedListener, MapboxMap.OnCameraMoveListener,
MapboxMap.OnCameraMoveCanceledListener, OnCameraIdleListener {
private final CameraChangeHandler handler = new CameraChangeHandler(this);
private boolean idle = true;
private int moveStartedReason;
private final CopyOnWriteArrayList<OnCameraMoveStartedListener> onCameraMoveStarted = new CopyOnWriteArrayList<>();
private final CopyOnWriteArrayList<OnCameraMoveCanceledListener> onCameraMoveCanceled = new CopyOnWriteArrayList<>();
private final CopyOnWriteArrayList<OnCameraMoveListener> onCameraMove = new CopyOnWriteArrayList<>();
private final CopyOnWriteArrayList<OnCameraIdleListener> onCameraIdle = new CopyOnWriteArrayList<>();
@Retention(SOURCE)
@IntDef( {MOVE_STARTED, MOVE, MOVE_CANCELED, IDLE})
@interface CameraChange {
}
private static final int MOVE_STARTED = 0;
private static final int MOVE = 1;
private static final int MOVE_CANCELED = 2;
private static final int IDLE = 3;
@Override
public void onCameraMoveStarted(final int reason) {
moveStartedReason = reason;
handler.scheduleMessage(MOVE_STARTED);
}
@Override
public void onCameraMove() {
handler.scheduleMessage(MOVE);
}
@Override
public void onCameraMoveCanceled() {
handler.scheduleMessage(MOVE_CANCELED);
}
@Override
public void onCameraIdle() {
handler.scheduleMessage(IDLE);
}
void addOnCameraIdleListener(@NonNull OnCameraIdleListener listener) {
onCameraIdle.add(listener);
}
void removeOnCameraIdleListener(@NonNull OnCameraIdleListener listener) {
if (onCameraIdle.contains(listener)) {
onCameraIdle.remove(listener);
}
}
void addOnCameraMoveCancelListener(OnCameraMoveCanceledListener listener) {
onCameraMoveCanceled.add(listener);
}
void removeOnCameraMoveCancelListener(OnCameraMoveCanceledListener listener) {
if (onCameraMoveCanceled.contains(listener)) {
onCameraMoveCanceled.remove(listener);
}
}
void addOnCameraMoveStartedListener(OnCameraMoveStartedListener listener) {
onCameraMoveStarted.add(listener);
}
void removeOnCameraMoveStartedListener(OnCameraMoveStartedListener listener) {
if (onCameraMoveStarted.contains(listener)) {
onCameraMoveStarted.remove(listener);
}
}
void addOnCameraMoveListener(OnCameraMoveListener listener) {
onCameraMove.add(listener);
}
void removeOnCameraMoveListener(OnCameraMoveListener listener) {
if (onCameraMove.contains(listener)) {
onCameraMove.remove(listener);
}
}
private void executeOnCameraMoveStarted() {
if (!idle) {
return;
}
idle = false;
if (!onCameraMoveStarted.isEmpty()) {
for (OnCameraMoveStartedListener cameraMoveStartedListener : onCameraMoveStarted) {
cameraMoveStartedListener.onCameraMoveStarted(moveStartedReason);
}
}
}
private void executeOnCameraMove() {
if (!onCameraMove.isEmpty() && !idle) {
for (OnCameraMoveListener cameraMoveListener : onCameraMove) {
cameraMoveListener.onCameraMove();
}
}
}
private void executeOnCameraMoveCancelled() {
if (!onCameraMoveCanceled.isEmpty() && !idle) {
for (OnCameraMoveCanceledListener cameraMoveCanceledListener : onCameraMoveCanceled) {
cameraMoveCanceledListener.onCameraMoveCanceled();
}
}
}
private void executeOnCameraIdle() {
if (idle) {
return;
}
idle = true;
if (!onCameraIdle.isEmpty()) {
for (OnCameraIdleListener cameraIdleListener : onCameraIdle) {
cameraIdleListener.onCameraIdle();
}
}
}
void onDestroy() {
handler.removeCallbacksAndMessages(null);
onCameraMoveStarted.clear();
onCameraMoveCanceled.clear();
onCameraMove.clear();
onCameraIdle.clear();
}
private static class CameraChangeHandler extends Handler {
private WeakReference<CameraChangeDispatcher> dispatcherWeakReference;
CameraChangeHandler(CameraChangeDispatcher dispatcher) {
super();
this.dispatcherWeakReference = new WeakReference<>(dispatcher);
}
@Override
public void handleMessage(@NonNull Message msg) {
CameraChangeDispatcher dispatcher = dispatcherWeakReference.get();
if (dispatcher != null) {
switch (msg.what) {
case MOVE_STARTED:
dispatcher.executeOnCameraMoveStarted();
break;
case MOVE:
dispatcher.executeOnCameraMove();
break;
case MOVE_CANCELED:
dispatcher.executeOnCameraMoveCancelled();
break;
case IDLE:
dispatcher.executeOnCameraIdle();
break;
}
}
}
void scheduleMessage(@CameraChange int change) {
CameraChangeDispatcher dispatcher = dispatcherWeakReference.get();
if (dispatcher != null) {
// if there is a movement that is cancelled/stopped and restarted in the same code block
// we can safely assume that the movement will continue, no need for dispatching unnecessary callbacks sequence
if (change == MOVE_STARTED) {
boolean shouldReturn = !dispatcher.idle && (hasMessages(IDLE) || hasMessages(MOVE_CANCELED));
removeMessages(IDLE);
removeMessages(MOVE_CANCELED);
if (shouldReturn) {
return;
}
}
Message message = new Message();
message.what = change;
this.sendMessage(message);
}
}
}
}
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