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simplify

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mertalev 2025-08-04 22:41:24 -04:00
parent 57970800bb
commit c84a589766
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1 changed files with 11 additions and 63 deletions
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74
mobile/lib/presentation/widgets/images/one_frame_multi_image_stream_completer.dart
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@ -11,17 +11,22 @@ import 'package:flutter/painting.dart';
class OneFramePlaceholderImageStreamCompleter extends ImageStreamCompleter {
ImageInfo? _initialImage;
/// The constructor to create an OneFramePlaceholderImageStreamCompleter. The [image]
/// should be the primary image to display. The [initialImage] is an optional
/// image that will be emitted synchronously, useful as a thumbnail or placeholder.
/// The constructor to create an OneFramePlaceholderImageStreamCompleter. The [images]
/// should be the primary images to display (typically asynchronously as they load).
/// The [initialImage] is an optional image that will be emitted synchronously
/// until the first stream image is completed, useful as a thumbnail or placeholder.
OneFramePlaceholderImageStreamCompleter(
Stream<ImageInfo> image, {
Stream<ImageInfo> images, {
ImageInfo? initialImage,
InformationCollector? informationCollector,
}) {
_initialImage = initialImage;
image.listen(
setImage,
images.listen(
(image) {
setImage(image);
_initialImage?.dispose();
_initialImage = null;
},
onError: (Object error, StackTrace stack) {
reportError(
context: ErrorDescription('resolving a single-frame image stream'),
@ -34,15 +39,8 @@ class OneFramePlaceholderImageStreamCompleter extends ImageStreamCompleter {
);
}
/// We must avoid disposing a completer if it never had a listener, even
/// if all [keepAlive] handles get disposed.
bool __hadAtLeastOneListener = false;
bool __disposed = false;
@override
void addListener(ImageStreamListener listener) {
__hadAtLeastOneListener = true;
final initialImage = _initialImage;
if (initialImage != null) {
try {
@ -58,30 +56,6 @@ class OneFramePlaceholderImageStreamCompleter extends ImageStreamCompleter {
super.addListener(listener);
}
@override
void removeListener(ImageStreamListener listener) {
super.removeListener(listener);
if (!hasListeners) {
__maybeDispose();
}
}
int __keepAliveHandles = 0;
@override
ImageStreamCompleterHandle keepAlive() {
final delegateHandle = super.keepAlive();
return _OneFramePlaceholderImageStreamCompleterHandle(this, delegateHandle);
}
void __maybeDispose() {
if (!__hadAtLeastOneListener || __disposed || hasListeners || __keepAliveHandles != 0) {
return;
}
__disposed = true;
}
@override
void onDisposed() {
_initialImage?.dispose();
@ -89,29 +63,3 @@ class OneFramePlaceholderImageStreamCompleter extends ImageStreamCompleter {
super.onDisposed();
}
}
class _OneFramePlaceholderImageStreamCompleterHandle implements ImageStreamCompleterHandle {
_OneFramePlaceholderImageStreamCompleterHandle(this._completer, this._delegateHandle) {
_completer!.__keepAliveHandles += 1;
}
OneFramePlaceholderImageStreamCompleter? _completer;
final ImageStreamCompleterHandle _delegateHandle;
/// Call this method to signal the [ImageStreamCompleter] that it can now be
/// disposed when its last listener drops.
///
/// This method must only be called once per object.
@override
void dispose() {
assert(_completer != null);
assert(_completer!.__keepAliveHandles > 0);
assert(!_completer!.__disposed);
_delegateHandle.dispose();
_completer!.__keepAliveHandles -= 1;
_completer!.__maybeDispose();
_completer = null;
}
}