public virtual void addListener(ImageListener listener, ImageErrorListener onError = null)
{
this._listeners.Add(new _ImageListenerPair {
listener = listener, errorListener = onError
});
if (this.currentImage != null)
{
try {
listener(this.currentImage, true);
}
catch (Exception ex) {
this.reportError(
context: "by a synchronously-called image listener",
exception: ex
);
}
}
if (this.currentError != null && onError != null)
{
try {
onError(this.currentError.exception);
}
catch (Exception ex) {
UIWidgetsError.reportError(
new UIWidgetsErrorDetails(
exception: ex,
library: "image resource service",
context: "when reporting an error to an image listener"
)
);
}
}
}
public HtmlOldParser(
float?width = null,
OnLinkTap onLinkTap = null,
bool renderNewlines = false,
CustomRender customRender = null,
float blockSpacing = 0.0f,
string html = null,
ImageErrorListener onImageError = null,
TextStyle linkStyle = null,
bool showImages = true
)
{
D.assert(width != null);
this.width = width.Value;
this.onLinkTap = onLinkTap;
this.renderNewlines = renderNewlines;
this.customRender = customRender;
this.blockSpacing = blockSpacing;
this.html = html;
this.onImageError = onImageError;
this.linkStyle = linkStyle;
this.showImages = showImages;
this.linkStyle = linkStyle ?? new TextStyle(
decoration: TextDecoration.underline,
color: Colors.blueAccent,
decorationColor: Colors.blueAccent);
}
ImageStreamListener _getListener(ImageLoadingBuilder loadingBuilder = null)
{
loadingBuilder = loadingBuilder ?? widget.loadingBuilder;
_lastException = null;
_lastStack = null;
ImageChunkListener onChunk = null;
if (loadingBuilder == null)
{
onChunk = _handleImageChunk;
}
ImageErrorListener onError = null;
if (widget.errorBuilder != null)
{
onError = error => {
setState(() => {
_lastException = error;
// _lastStack = stackTrace;
});
};
}
return(new ImageStreamListener(
onImage: _handleImageFrame,
onChunk: onChunk,
onError: onError
));
}
public override void resolveStreamForKey(
ImageConfiguration configuration,
ImageStream stream, T key,
ImageErrorListener handleError)
{
if (stream.completer != null || PaintingBinding.instance.imageCache.containsKey(key))
{
imageProvider.resolveStreamForKey(configuration, stream, key, handleError);
return;
}
if (context.context == null)
{
return;
}
if (Scrollable.recommendDeferredLoadingForContext(context.context))
{
SchedulerBinding.instance.scheduleFrameCallback((_) => {
async_.scheduleMicrotask(
() => {
resolveStreamForKey(configuration, stream, key, handleError);
return(null);
}
);
});
return;
}
imageProvider.resolveStreamForKey(configuration, stream, key, handleError);
}
public override void addListener(ImageListener listener, ImageErrorListener onError = null)
{
if (!this.hasListeners && this._codec != null)
{
this._decodeNextFrameAndSchedule();
}
base.addListener(listener, onError: onError);
}
BoxDecoration _createDefaultThumbDecoration(Color color, ImageProvider image,
ImageErrorListener errorListener)
{
return(new BoxDecoration(
color: color,
image: image == null ? null : new DecorationImage(image: image, onError: errorListener),
shape: BoxShape.circle,
boxShadow: material_.kElevationToShadow[1]
));
}
public ImageStreamListener(
ImageListener onImage,
ImageChunkListener onChunk = null,
ImageErrorListener onError = null
)
{
D.assert(onImage != null);
this.onImage = onImage;
this.onChunk = onChunk;
this.onError = onError;
}
public _RenderSwitch(
bool?value = null,
Color activeColor = null,
Color inactiveColor = null,
Color hoverColor = null,
Color focusColor = null,
ImageProvider activeThumbImage = null,
ImageErrorListener onActiveThumbImageError = null,
ImageProvider inactiveThumbImage = null,
ImageErrorListener onInactiveThumbImageError = null,
Color activeTrackColor = null,
Color inactiveTrackColor = null,
ImageConfiguration configuration = null,
BoxConstraints additionalConstraints = null,
TextDirection?textDirection = null,
ValueChanged <bool?> onChanged = null,
DragStartBehavior?dragStartBehavior = null,
bool hasFocus = false,
bool hovering = false,
_SwitchState state = null
) : base(
value: value,
tristate: false,
activeColor: activeColor,
inactiveColor: inactiveColor,
hoverColor: hoverColor,
focusColor: focusColor,
onChanged: onChanged,
additionalConstraints: additionalConstraints,
hasFocus: hasFocus,
hovering: hovering,
vsync: state
)
{
D.assert(textDirection != null);
_activeThumbImage = activeThumbImage;
_onActiveThumbImageError = onActiveThumbImageError;
_inactiveThumbImage = inactiveThumbImage;
_onInactiveThumbImageError = onInactiveThumbImageError;
_activeTrackColor = activeTrackColor;
_inactiveTrackColor = inactiveTrackColor;
_configuration = configuration;
_drag = new HorizontalDragGestureRecognizer {
onStart = _handleDragStart,
onUpdate = _handleDragUpdate,
onEnd = _handleDragEnd,
dragStartBehavior = dragStartBehavior ?? DragStartBehavior.down
};
}
public void addListener(ImageListener listener, ImageErrorListener onError = null)
{
if (this._completer != null)
{
this._completer.addListener(listener, onError);
return;
}
if (this._listeners == null)
{
this._listeners = new List <_ImageListenerPair>();
}
this._listeners.Add(new _ImageListenerPair {
listener = listener, errorListener = onError
});
}
public HtmlView(
Key key = null,
string data = null,
EdgeInsets padding = null,
Color backgroundColor = null,
TextStyle defaultTextStyle = null,
OnLinkTap onLinkTap = null,
bool renderNewlines = false,
CustomRender customRender = null,
CustomEdgeInsets customEdgeInsets = null,
CustomTextStyle customTextStyle = null,
CustomTextAlign customTextAlign = null,
float blockSpacing = 14.0f,
bool useRichText = true,
ImageErrorListener onImageError = null,
TextStyle linkStyle = null,
bool shrinkToFit = false,
ImageProperties imageProperties = null,
OnImageTap onImageTap = null,
bool showImages = true
) : base(key: key)
{
D.assert(data != null);
this.data = data;
this.padding = padding;
this.backgroundColor = backgroundColor;
this.defaultTextStyle = defaultTextStyle;
this.onLinkTap = onLinkTap;
this.renderNewlines = renderNewlines;
this.customRender = customRender;
this.customEdgeInsets = customEdgeInsets;
this.customTextStyle = customTextStyle ?? this._customTextStyle;
this.customTextAlign = customTextAlign;
this.blockSpacing = blockSpacing;
this.useRichText = useRichText;
this.onImageError = onImageError;
this.linkStyle = linkStyle ?? new TextStyle(
decoration: TextDecoration.underline,
color: Colors.blueAccent,
decorationColor: Colors.blueAccent);
this.shrinkToFit = shrinkToFit;
this.imageProperties = imageProperties;
this.onImageTap = onImageTap;
this.showImages = showImages;
}
public _SwitchRenderObjectWidget(
Key key = null,
bool?value = null,
Color activeColor = null,
Color inactiveColor = null,
Color hoverColor = null,
Color focusColor = null,
ImageProvider activeThumbImage = null,
ImageErrorListener onActiveThumbImageError = null,
ImageProvider inactiveThumbImage = null,
ImageErrorListener onInactiveThumbImageError = null,
Color activeTrackColor = null,
Color inactiveTrackColor = null,
ImageConfiguration configuration = null,
ValueChanged <bool?> onChanged = null,
BoxConstraints additionalConstraints = null,
DragStartBehavior?dragStartBehavior = null,
bool hasFocus = false,
bool hovering = false,
_SwitchState state = null
) : base(key: key)
{
D.assert(value != null);
this.value = value.Value;
this.activeColor = activeColor;
this.inactiveColor = inactiveColor;
this.hoverColor = hoverColor;
this.focusColor = focusColor;
this.activeThumbImage = activeThumbImage;
this.onActiveThumbImageError = onActiveThumbImageError;
this.inactiveThumbImage = inactiveThumbImage;
this.onInactiveThumbImageError = onInactiveThumbImageError;
this.activeTrackColor = activeTrackColor;
this.inactiveTrackColor = inactiveTrackColor;
this.configuration = configuration;
this.onChanged = onChanged;
this.additionalConstraints = additionalConstraints;
this.dragStartBehavior = dragStartBehavior;
this.hasFocus = hasFocus;
this.hovering = hovering;
this.state = state;
}
Switch(
Key key = null,
bool?value = null,
ValueChanged <bool?> onChanged = null,
Color activeColor = null,
Color activeTrackColor = null,
Color inactiveThumbColor = null,
Color inactiveTrackColor = null,
ImageProvider activeThumbImage = null,
ImageErrorListener onActiveThumbImageError = null,
ImageProvider inactiveThumbImage = null,
ImageErrorListener onInactiveThumbImageError = null,
MaterialTapTargetSize?materialTapTargetSize = null,
_SwitchType switchType = _SwitchType.material,
DragStartBehavior dragStartBehavior = DragStartBehavior.start,
Color focusColor = null,
Color hoverColor = null,
FocusNode focusNode = null,
bool autofocus = false
) : base(key : key)
{
D.assert(value != null);
this.value = value.Value;
D.assert(activeThumbImage != null || onActiveThumbImageError == null);
D.assert(inactiveThumbImage != null || onInactiveThumbImageError == null);
this.onChanged = onChanged;
this.activeColor = activeColor;
this.activeTrackColor = activeTrackColor;
this.inactiveThumbColor = inactiveThumbColor;
this.inactiveTrackColor = inactiveTrackColor;
this.activeThumbImage = activeThumbImage;
this.onActiveThumbImageError = onActiveThumbImageError;
this.inactiveThumbImage = inactiveThumbImage;
this.onInactiveThumbImageError = onInactiveThumbImageError;
this.materialTapTargetSize = materialTapTargetSize;
_switchType = switchType;
this.dragStartBehavior = dragStartBehavior;
this.focusColor = focusColor;
this.hoverColor = hoverColor;
this.focusNode = focusNode;
this.autofocus = autofocus;
}
public DecorationImage(
ImageProvider image = null,
ImageErrorListener onError = null,
ColorFilter colorFilter = null,
BoxFit?fit = null,
AlignmentGeometry alignment = null,
Rect centerSlice = null,
ImageRepeat repeat = ImageRepeat.noRepeat,
bool matchTextDirection = false
)
{
D.assert(image != null);
this.image = image;
this.onError = onError;
this.colorFilter = colorFilter;
this.fit = fit;
this.alignment = alignment ?? Alignment.center;
this.centerSlice = centerSlice;
this.repeat = repeat;
this.matchTextDirection = matchTextDirection;
}
public Switch(
Key key = null,
bool?value = null,
ValueChanged <bool?> onChanged = null,
Color activeColor = null,
Color activeTrackColor = null,
Color inactiveThumbColor = null,
Color inactiveTrackColor = null,
ImageProvider activeThumbImage = null,
ImageErrorListener onActiveThumbImageError = null,
ImageProvider inactiveThumbImage = null,
ImageErrorListener onInactiveThumbImageError = null,
MaterialTapTargetSize?materialTapTargetSize = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start,
Color focusColor = null,
Color hoverColor = null,
FocusNode focusNode = null,
bool autofocus = false
) : this(
key : key,
value : value,
onChanged : onChanged,
activeColor : activeColor,
activeTrackColor : activeTrackColor,
inactiveThumbColor : inactiveThumbColor,
inactiveTrackColor : inactiveTrackColor,
activeThumbImage : activeThumbImage,
onActiveThumbImageError : onActiveThumbImageError,
inactiveThumbImage : inactiveThumbImage,
onInactiveThumbImageError : onInactiveThumbImageError,
materialTapTargetSize : materialTapTargetSize,
switchType : _SwitchType.material,
dragStartBehavior : dragStartBehavior,
focusColor : focusColor,
hoverColor : hoverColor,
focusNode : focusNode,
autofocus : autofocus
)
{
}
public static Future precacheImage(
ImageProvider provider,
BuildContext context,
Size size = null,
ImageErrorListener onError = null
)
{
var config = createLocalImageConfiguration(context: context, size: size);
var completer = Completer.create();
var stream = provider.resolve(configuration: config);
ImageStreamListener listener = null;
listener = new ImageStreamListener(
(image, sync) => {
if (!completer.isCompleted)
{
completer.complete();
}
SchedulerBinding.instance.addPostFrameCallback(timeStamp => {
stream.removeListener(listener: listener);
});
},
onError: error => {
if (!completer.isCompleted)
{
completer.complete();
}
stream.removeListener(listener: listener);
UIWidgetsError.reportError(new UIWidgetsErrorDetails(
context: new ErrorDescription("image failed to precache"),
library: "image resource service",
silent: true));
}
);
stream.addListener(listener: listener);
return(completer.future);
}
public IPromise precacheImage(
ImageProvider provider,
BuildContext context,
Size size = null,
ImageErrorListener onError = null
)
{
ImageConfiguration config = createLocalImageConfiguration(context, size: size);
var completer = new Promise();
ImageStream stream = provider.resolve(config);
void listener(ImageInfo image, bool sync)
{
completer.Resolve();
stream.removeListener(listener);
}
void errorListener(Exception exception)
{
completer.Resolve();
stream.removeListener(listener);
if (onError != null)
{
onError(exception);
}
else
{
UIWidgetsError.reportError(new UIWidgetsErrorDetails(
context: "image failed to precache",
library: "image resource service",
exception: exception,
silent: true
));
}
}
stream.addListener(listener, onError: errorListener);
return(completer);
}
public static Ink image(
Key key = null,
EdgeInsetsGeometry padding = null,
ImageProvider image = null,
ImageErrorListener onImageError = null,
ColorFilter colorFilter = null,
BoxFit?fit = null,
AlignmentGeometry alignment = null,
Rect centerSlice = null,
ImageRepeat repeat = ImageRepeat.noRepeat,
float?width = null,
float?height = null,
Widget child = null
)
{
D.assert(padding == null || padding.isNonNegative);
D.assert(image != null);
alignment = alignment ?? Alignment.center;
Decoration decoration = new BoxDecoration(
image: new DecorationImage(
image: image,
onError: onImageError,
colorFilter: colorFilter,
fit: fit,
alignment: alignment,
centerSlice: centerSlice,
repeat: repeat)
);
return(new Ink(
key: key,
padding: padding,
decoration: decoration,
width: width,
height: height,
child: child));
}
public CircleAvatar(
Key key = null,
Widget child = null,
Color backgroundColor = null,
ImageProvider backgroundImage = null,
ImageErrorListener onBackgroundImageError = null,
Color foregroundColor = null,
float?radius = null,
float?minRadius = null,
float?maxRadius = null
) : base(key: key)
{
D.assert(radius == null || (minRadius == null && maxRadius == null));
D.assert(backgroundImage != null || onBackgroundImageError == null);
this.child = child;
this.backgroundColor = backgroundColor;
this.backgroundImage = backgroundImage;
this.onBackgroundImageError = onBackgroundImageError;
this.foregroundColor = foregroundColor;
this.radius = radius;
this.minRadius = minRadius;
this.maxRadius = maxRadius;
}
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);
}
public ImageStreamCompleter putIfAbsent(object key, Func <ImageStreamCompleter> loader,
ImageErrorListener onError = null)
{
D.assert(key != null);
D.assert(loader != null);
ImageStreamCompleter result = null;
if (this._pendingImages.TryGetValue(key, out var pendingImage))
{
result = pendingImage.completer;
return(result);
}
if (this._cache.TryGetValue(key, out var image))
{
// put to the MRU position
this._lruKeys.Remove(image.node);
image.node = this._lruKeys.AddLast(key);
return(image.completer);
}
try {
result = loader();
}
catch (Exception ex) {
if (onError != null)
{
onError(ex);
}
else
{
throw;
}
}
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);
if (this.maximumSizeBytes > 0 && imageSize > this.maximumSizeBytes)
{
this._maximumSizeBytes = imageSize + 1000;
}
this._currentSizeBytes += imageSize;
if (this._pendingImages.TryGetValue(key, out var loadedPendingImage))
{
loadedPendingImage.removeListener();
this._pendingImages.Remove(key);
}
D.assert(!this._cache.ContainsKey(key));
this._cache[key] = cachedImage;
cachedImage.node = this._lruKeys.AddLast(key);
this._checkCacheSize();
}
if (this.maximumSize > 0 && this.maximumSizeBytes > 0)
{
this._pendingImages[key] = new _PendingImage(result, listener);
result.addListener(listener);
}
return(result);
}
public override void paint(PaintingContext context, Offset offset)
{
Canvas canvas = context.canvas;
bool isEnabled = onChanged != null;
float currentValue = position.value;
float visualPosition = currentValue;
Color trackColor = isEnabled
? Color.lerp(inactiveTrackColor, activeTrackColor, currentValue)
: inactiveTrackColor;
Color thumbColor = isEnabled
? Color.lerp(inactiveColor, activeColor, currentValue)
: inactiveColor;
ImageProvider thumbImage = isEnabled
? (currentValue < 0.5 ? inactiveThumbImage : activeThumbImage)
: inactiveThumbImage;
ImageErrorListener thumbErrorListener = isEnabled
? (currentValue < 0.5f ? onInactiveThumbImageError : onActiveThumbImageError)
: onInactiveThumbImageError;
// Paint the track
Paint paint = new Paint {
color = trackColor
};
float trackHorizontalPadding = material_.kRadialReactionRadius - Switch._kTrackRadius;
Rect trackRect = Rect.fromLTWH(
offset.dx + trackHorizontalPadding,
offset.dy + (size.height - Switch._kTrackHeight) / 2.0f,
size.width - 2.0f * trackHorizontalPadding,
Switch._kTrackHeight
);
RRect trackRRect = RRect.fromRectAndRadius(trackRect, Radius.circular(Switch._kTrackRadius));
canvas.drawRRect(trackRRect, paint);
Offset thumbPosition = new Offset(
material_.kRadialReactionRadius + visualPosition * _trackInnerLength,
size.height / 2.0f
);
paintRadialReaction(canvas, offset, thumbPosition);
try {
_isPainting = true;
BoxPainter thumbPainter;
if (_cachedThumbPainter == null || thumbColor != _cachedThumbColor ||
thumbImage != _cachedThumbImage || thumbErrorListener != _cachedThumbErrorListener)
{
_cachedThumbColor = thumbColor;
_cachedThumbImage = thumbImage;
_cachedThumbErrorListener = thumbErrorListener;
_cachedThumbPainter = _createDefaultThumbDecoration(thumbColor, thumbImage, thumbErrorListener)
.createBoxPainter(_handleDecorationChanged);
}
thumbPainter = _cachedThumbPainter;
float inset = 1.0f - (currentValue - 0.5f).abs() * 2.0f;
float radius = Switch._kThumbRadius - inset;
thumbPainter.paint(
canvas,
thumbPosition + offset - new Offset(radius, radius),
configuration.copyWith(size: Size.fromRadius(radius))
);
}
finally {
_isPainting = false;
}
}