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Reduce the number of rebuilds

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This commit is contained in:
Vishnu Mohandas 2020-06-10 05:34:22 +05:30
parent 99df8f811b
commit a659fefa6d
1 changed files with 21 additions and 15 deletions
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36
lib/ui/zoomable_image.dart
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@ -24,7 +24,9 @@ class ZoomableImage extends StatefulWidget {
class _ZoomableImageState extends State<ZoomableImage> {
ImageProvider _imageProvider;
bool _loadedSmallThumbnail = false;
bool _loadingLargeThumbnail = false;
bool _loadedLargeThumbnail = false;
bool _loadingFinalImage = false;
bool _loadedFinalImage = false;
ValueChanged<PhotoViewScaleState> _scaleStateChangedCallback;
@ -83,7 +85,10 @@ class _ZoomableImageState extends State<ZoomableImage> {
}
}
if (!_loadedLargeThumbnail && !_loadedFinalImage) {
if (!_loadingLargeThumbnail &&
!_loadedLargeThumbnail &&
!_loadedFinalImage) {
_loadingLargeThumbnail = true;
final cachedThumbnail =
ThumbnailLruCache.get(widget.photo, THUMBNAIL_LARGE_SIZE);
if (cachedThumbnail != null) {
@ -99,7 +104,8 @@ class _ZoomableImageState extends State<ZoomableImage> {
}
}
if (!_loadedFinalImage) {
if (!_loadingFinalImage && !_loadedFinalImage) {
_loadingFinalImage = true;
final cachedFile = ImageLruCache.get(widget.photo);
if (cachedFile != null) {
final imageProvider = Image.file(cachedFile).image;
@ -107,11 +113,9 @@ class _ZoomableImageState extends State<ZoomableImage> {
} else {
widget.photo.getAsset().file.then((file) {
if (mounted) {
setState(() {
final imageProvider = Image.file(file).image;
_onFinalImageLoaded(imageProvider, context);
ImageLruCache.put(widget.photo, file);
});
final imageProvider = Image.file(file).image;
_onFinalImageLoaded(imageProvider, context);
ImageLruCache.put(widget.photo, file);
}
});
}
@ -120,14 +124,16 @@ class _ZoomableImageState extends State<ZoomableImage> {
void _onLargeThumbnailLoaded(
ImageProvider imageProvider, BuildContext context) {
precacheImage(imageProvider, context).then((value) {
if (mounted) {
setState(() {
_imageProvider = imageProvider;
_loadedLargeThumbnail = true;
});
}
});
if (!_loadedFinalImage) {
precacheImage(imageProvider, context).then((value) {
if (mounted) {
setState(() {
_imageProvider = imageProvider;
_loadedLargeThumbnail = true;
});
}
});
}
}
void _onFinalImageLoaded(ImageProvider imageProvider, BuildContext context) {