public virtual void addListener(ImageStreamListener listener)
{
_listeners.Add(listener);
if (_currentImage != null)
{
try {
listener.onImage(_currentImage, true);
}
catch (Exception exception) {
reportError(
context: new ErrorDescription("by a synchronously-called image listener"),
exception: exception
);
}
}
if (_currentError != null && listener.onError != null)
{
try {
listener.onError(_currentError.exception);
}
catch (Exception exception) {
UIWidgetsError.reportError(
new UIWidgetsErrorDetails(
exception: exception,
library: "image resource service",
context: new ErrorDescription("by a synchronously-called image error listener")
)
);
}
}
}
public override void removeListener(ImageStreamListener listener)
{
base.removeListener(listener);
if (!hasListeners)
{
_timer?.cancel();
_timer = null;
}
}
public override void addListener(ImageStreamListener listener)
{
if (!hasListeners && _codec != null)
{
_decodeNextFrameAndSchedule();
}
base.addListener(listener);
}
public void addListener(ImageStreamListener listener)
{
if (_completer != null)
{
_completer.addListener(listener);
return;
}
if (_listeners == null)
{
_listeners = new List <ImageStreamListener>();
}
_listeners.Add(listener);
}
public void removeListener(ImageStreamListener listener)
{
if (_completer != null)
{
_completer.removeListener(listener);
return;
}
D.assert(_listeners != null);
for (int i = 0; i < _listeners.Count; i++)
{
if (_listeners[i] == listener)
{
_listeners.RemoveAt(i);
break;
}
}
}
public virtual void removeListener(ImageStreamListener listener)
{
for (int i = 0; i < _listeners.Count; i += 1)
{
if (_listeners[i] == listener)
{
_listeners.RemoveAt(i);
break;
}
}
if (_listeners.isEmpty())
{
foreach (VoidCallback callback in _onLastListenerRemovedCallbacks)
{
callback();
}
_onLastListenerRemovedCallbacks.Clear();
}
}
public void paint(Canvas canvas, Rect rect, Path clipPath, ImageConfiguration configuration)
{
D.assert(canvas != null);
D.assert(rect != null);
D.assert(configuration != null);
bool flipHorizontally = false;
if (_details.matchTextDirection)
{
D.assert(() => {
// We check this first so that the assert will fire immediately, not just
// when the image is ready.
if (configuration.textDirection == null)
{
throw new UIWidgetsError(new List <DiagnosticsNode>()
{
new ErrorSummary(
"DecorationImage.matchTextDirection can only be used when a TextDirection is available."),
new ErrorDescription(
"When DecorationImagePainter.paint() was called, there was no text direction provided " +
"in the ImageConfiguration object to match."
),
new DiagnosticsProperty <DecorationImage>("The DecorationImage was", _details,
style: DiagnosticsTreeStyle.errorProperty),
new DiagnosticsProperty <ImageConfiguration>("The ImageConfiguration was", configuration,
style: DiagnosticsTreeStyle.errorProperty)
});
}
return(true);
});
if (configuration.textDirection == TextDirection.rtl)
{
flipHorizontally = true;
}
}
ImageStream newImageStream = _details.image.resolve(configuration);
if (newImageStream.key != _imageStream?.key)
{
ImageStreamListener listener = new ImageStreamListener(
_handleImage,
onError: _details.onError
);
_imageStream?.removeListener(listener);
_imageStream = newImageStream;
_imageStream.addListener(listener);
}
if (_image == null)
{
return;
}
if (clipPath != null)
{
canvas.save();
canvas.clipPath(clipPath);
}
painting_.paintImage(
canvas: canvas,
rect: rect,
image: _image.image,
scale: _image.scale,
colorFilter: _details.colorFilter,
fit: _details.fit,
alignment: _details.alignment.resolve(configuration.textDirection),
centerSlice: _details.centerSlice,
repeat: _details.repeat,
flipHorizontally: flipHorizontally,
filterQuality: FilterQuality.low
);
if (clipPath != null)
{
canvas.restore();
}
}
public ImageStreamCompleter putIfAbsent(object key, Func <ImageStreamCompleter> loader,
ImageErrorListener onError = null)
{
D.assert(key != null);
D.assert(loader != null);
ImageStreamCompleter result = null;
if (_pendingImages.TryGetValue(key, out var pendingImage))
{
result = pendingImage.completer;
return(result);
}
if (_cache.TryGetValue(key, out var image))
{
if (image.node != null)
{
_lruKeys.Remove(image.node);
}
_trackLiveImage(key, new _LiveImage(image.completer, image.sizeBytes, () => _liveImages.Remove(key)));
image.node = _lruKeys.AddLast(key);
return(image.completer);
}
_liveImages.TryGetValue(key, out var liveImage);
if (liveImage != null)
{
_touch(key, liveImage);
return(liveImage.completer);
}
try {
result = loader();
_trackLiveImage(key, new _LiveImage(result, null, () => _liveImages.Remove(key)));
}
catch (Exception ex) {
if (onError != null)
{
onError(ex);
}
else
{
throw;
}
}
bool listenedOnce = false;
_PendingImage untrackedPendingImage = null;
void listener(ImageInfo info, bool syncCall)
{
int imageSize = info?.image == null ? 0 : info.image.height * info.image.width * 4;
_CachedImage cachedImage = new _CachedImage(result, imageSize);
_trackLiveImage(
key,
new _LiveImage(
result,
imageSize,
() => _liveImages.Remove(key)
),
debugPutOk: syncCall
);
_PendingImage _pendingImage = untrackedPendingImage ?? _pendingImages.getOrDefault(key);
_pendingImages.Remove(key);
if (_pendingImage != null)
{
_pendingImage.removeListener();
}
if (untrackedPendingImage == null)
{
_touch(key, cachedImage);
}
listenedOnce = true;
}
ImageStreamListener streamListener = new ImageStreamListener(listener);
if (maximumSize > 0 && maximumSizeBytes > 0)
{
_pendingImages[key] = new _PendingImage(result, streamListener);
}
else
{
untrackedPendingImage = new _PendingImage(result, streamListener);
}
result.addListener(streamListener);
return(result);
}
