com.bumptech.glide.manager.ActivityFragmentLifecycle Maven / Gradle / Ivy

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A fast and efficient image loading library for Android focused on smooth scrolling.

There is a newer version: 5.0.0-rc01

package com.bumptech.glide.manager;

import com.bumptech.glide.util.Util;
import java.util.Collections;
import java.util.Set;
import java.util.WeakHashMap;

/**
 * A {@link com.bumptech.glide.manager.Lifecycle} implementation for tracking and notifying
 * listeners of {@link android.app.Fragment} and {@link android.app.Activity} lifecycle events.
 */
class ActivityFragmentLifecycle implements Lifecycle {
  private final Set lifecycleListeners =
      Collections.newSetFromMap(new WeakHashMap());
  private boolean isStarted;
  private boolean isDestroyed;

  /**
   * Adds the given listener to the list of listeners to be notified on each lifecycle event.
   *
   *  The latest lifecycle event will be called on the given listener synchronously in this
   * method. If the activity or fragment is stopped, {@link LifecycleListener#onStop()}} will be
   * called, and same for onStart and onDestroy. 
   *
   *  Note - {@link com.bumptech.glide.manager.LifecycleListener}s that are added more than once
   * will have their lifecycle methods called more than once. It is the caller's responsibility to
   * avoid adding listeners multiple times. 
   */
  @Override
  public void addListener(LifecycleListener listener) {
    lifecycleListeners.add(listener);

    if (isDestroyed) {
      listener.onDestroy();
    } else if (isStarted) {
      listener.onStart();
    } else {
      listener.onStop();
    }
  }

  @Override
  public void removeListener(LifecycleListener listener) {
    lifecycleListeners.remove(listener);
  }

  void onStart() {
    isStarted = true;
    for (LifecycleListener lifecycleListener : Util.getSnapshot(lifecycleListeners)) {
      lifecycleListener.onStart();
    }
  }

  void onStop() {
    isStarted = false;
    for (LifecycleListener lifecycleListener : Util.getSnapshot(lifecycleListeners)) {
      lifecycleListener.onStop();
    }
  }

  void onDestroy() {
    isDestroyed = true;
    for (LifecycleListener lifecycleListener : Util.getSnapshot(lifecycleListeners)) {
      lifecycleListener.onDestroy();
    }
  }
}