clear method Null safety

void clear()

Evicts all pending and keepAlive entries from the cache.

This is useful if, for instance, the root asset bundle has been updated and therefore new images must be obtained.

Images which have not finished loading yet will not be removed from the cache, and when they complete they will be inserted as normal.

This method does not clear live references to images, since clearing those would not reduce memory pressure. Such images still have listeners in the application code, and will still remain resident in memory.

To clear live references, use clearLiveImages.

Implementation

void clear() {
  if (!kReleaseMode) {
    Timeline.instantSync(
      'ImageCache.clear',
      arguments: <String, dynamic>{
        'pendingImages': _pendingImages.length,
        'keepAliveImages': _cache.length,
        'liveImages': _liveImages.length,
        'currentSizeInBytes': _currentSizeBytes,
      },
    );
  }
  for (final _CachedImage image in _cache.values) {
    image.dispose();
  }
  _cache.clear();
  for (final _PendingImage pendingImage in _pendingImages.values) {
    pendingImage.removeListener();
  }
  _pendingImages.clear();
  _currentSizeBytes = 0;
}