CachedNetworkImage class

Inheritance

Constructors

CachedNetworkImage({Key key, @required String imageUrl, Map<String, String> httpHeaders, ImageWidgetBuilder imageBuilder, PlaceholderWidgetBuilder placeholder, ProgressIndicatorBuilder progressIndicatorBuilder, LoadingErrorWidgetBuilder errorWidget, Duration fadeOutDuration: const Duration(milliseconds: 1000), Curve fadeOutCurve: Curves.easeOut, Duration fadeInDuration: const Duration(milliseconds: 500), Curve fadeInCurve: Curves.easeIn, double width, double height, BoxFit fit, AlignmentGeometry alignment: Alignment.center, ImageRepeat repeat: ImageRepeat.noRepeat, bool matchTextDirection: false, BaseCacheManager cacheManager, bool useOldImageOnUrlChange: false, Color color, FilterQuality filterQuality: FilterQuality.low, BlendMode colorBlendMode, Duration placeholderFadeInDuration, int memCacheWidth, int memCacheHeight, ImageRenderMethodForWeb imageRenderMethodForWeb})
CachedNetworkImage shows a network image using a caching mechanism. It also provides support for a placeholder, showing an error and fading into the loaded image. Next to that it supports most features of a default Image widget.

Properties

alignment AlignmentGeometry
How to align the image within its bounds. [...]
final
cacheManager BaseCacheManager
Option to use cachemanager with other settings
final
color Color
If non-null, this color is blended with each image pixel using colorBlendMode.
final
colorBlendMode BlendMode
Used to combine color with this image. [...]
final
errorWidget LoadingErrorWidgetBuilder
Widget displayed while the target imageUrl failed loading.
final
fadeInCurve Curve
The curve of the fade-in animation for the imageUrl.
final
fadeInDuration Duration
The duration of the fade-in animation for the imageUrl.
final
fadeOutCurve Curve
The curve of the fade-out animation for the placeholder.
final
fadeOutDuration Duration
The duration of the fade-out animation for the placeholder.
final
filterQuality FilterQuality
Target the interpolation quality for image scaling. [...]
final
fit BoxFit
How to inscribe the image into the space allocated during layout. [...]
final
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
height double
If non-null, require the image to have this height. [...]
final
httpHeaders Map<String, String>
Optional headers for the http request of the image url
final
imageBuilder ImageWidgetBuilder
Optional builder to further customize the display of the image.
final
imageUrl String
The target image that is displayed.
final
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
matchTextDirection bool
Whether to paint the image in the direction of the TextDirection. [...]
final
memCacheHeight int
Will resize the image in cache to have a certain height using ResizeImage
final
memCacheWidth int
Will resize the image in cache to have a certain width using ResizeImage
final
placeholder PlaceholderWidgetBuilder
Widget displayed while the target imageUrl is loading.
final
placeholderFadeInDuration Duration
The duration of the fade-in animation for the placeholder.
final
progressIndicatorBuilder ProgressIndicatorBuilder
Widget displayed while the target imageUrl is loading.
final
repeat ImageRepeat
How to paint any portions of the layout bounds not covered by the image.
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
useOldImageOnUrlChange bool
When set to true it will animate from the old image to the new image if the url changes.
final
width double
If non-null, require the image to have this width. [...]
final

Methods

build(BuildContext context) Widget
Describes the part of the user interface represented by this widget. [...]
override
createElement() StatelessElement
Creates a StatelessElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.info}) String
Returns a string representation of this object.
inherited
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants. [...]
inherited
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object. [...]
inherited
toStringShort() String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited

Static Methods

evictFromCache(String url, {BaseCacheManager cacheManager, double scale: 1.0}) Future
Evict an image from both the disk file based caching system of the BaseCacheManager as the in memory ImageCache of the ImageProvider. url is used by both the disk and memory cache. The scale is only used to clear the image from the ImageCache.