67 lines
2.3 KiB
Dart
67 lines
2.3 KiB
Dart
import 'dart:math';
|
|
import 'dart:ui';
|
|
|
|
import 'package:aves/image_providers/region_provider.dart';
|
|
import 'package:aves/image_providers/thumbnail_provider.dart';
|
|
import 'package:aves/image_providers/uri_image_provider.dart';
|
|
import 'package:aves/model/entry.dart';
|
|
import 'package:flutter/foundation.dart';
|
|
import 'package:flutter/widgets.dart';
|
|
|
|
extension ExtraAvesEntry on AvesEntry {
|
|
ThumbnailProvider getThumbnail({double extent = 0}) {
|
|
return ThumbnailProvider(_getThumbnailProviderKey(extent));
|
|
}
|
|
|
|
ThumbnailProviderKey _getThumbnailProviderKey(double extent) {
|
|
// we standardize the thumbnail loading dimension by taking the nearest larger power of 2
|
|
// so that there are less variants of the thumbnails to load and cache
|
|
// it increases the chance of cache hit when loading similarly sized columns (e.g. on orientation change)
|
|
final requestExtent = extent == 0 ? .0 : pow(2, (log(extent) / log(2)).ceil()).toDouble();
|
|
|
|
return ThumbnailProviderKey(
|
|
uri: uri,
|
|
mimeType: mimeType,
|
|
pageId: pageId,
|
|
rotationDegrees: rotationDegrees,
|
|
isFlipped: isFlipped,
|
|
dateModifiedSecs: dateModifiedSecs ?? -1,
|
|
extent: requestExtent,
|
|
);
|
|
}
|
|
|
|
RegionProvider getRegion({@required int sampleSize, Rectangle<int> region}) {
|
|
return RegionProvider(_getRegionProviderKey(sampleSize, region));
|
|
}
|
|
|
|
RegionProviderKey _getRegionProviderKey(int sampleSize, Rectangle<int> region) {
|
|
return RegionProviderKey(
|
|
uri: uri,
|
|
mimeType: mimeType,
|
|
pageId: pageId,
|
|
rotationDegrees: rotationDegrees,
|
|
isFlipped: isFlipped,
|
|
sampleSize: sampleSize,
|
|
region: region ?? Rectangle<int>(0, 0, width, height),
|
|
imageSize: Size(width.toDouble(), height.toDouble()),
|
|
);
|
|
}
|
|
|
|
UriImage get uriImage => UriImage(
|
|
uri: uri,
|
|
mimeType: mimeType,
|
|
pageId: pageId,
|
|
rotationDegrees: rotationDegrees,
|
|
isFlipped: isFlipped,
|
|
expectedContentLength: sizeBytes,
|
|
);
|
|
|
|
bool _isReady(Object providerKey) => imageCache.statusForKey(providerKey).keepAlive;
|
|
|
|
ImageProvider getBestThumbnail(double extent) {
|
|
final sizedThumbnailKey = _getThumbnailProviderKey(extent);
|
|
if (_isReady(sizedThumbnailKey)) return ThumbnailProvider(sizedThumbnailKey);
|
|
|
|
return getThumbnail();
|
|
}
|
|
}
|