NineImage class

九图处理工具

通过传入.9.png的图，然后通过计算ImagePixels方法获取到所有图片的像素信息， 通过遍历四周像素坐标系获得拉伸区域和填充区域，即得到自带伸缩的图形展示区域根据child大小拉伸。

hideLines defulte = true 表示默认裁切.9的黑边像素.

imageProvider 原始.9图片对象， AssetImage("assets/xxx.9.png") 这里最好是一倍图 并且.9图最好设置最小两个像素点，否则会出现识别失败情况

child 内容填充区域用于展.9图内容，比如文本，图片等。

参考坐标系

注意，这里使用centerSlice之后，显示图片的大小大于原图的情况下才可以使用这个属性，要不然会报错.理由是下面这个源码： assert(sourceSize == inputSize, 'centerSlice was used with a BoxFit that does not guarantee that the image is fully visible.');

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• NineImage

Constructors

NineImage({Key? key, required ImageProvider<Object> imageProvider, required Widget child, bool hideLines = true})

const

Properties

child → Widget

child widget for example Text("Hi welcome ")

final

hashCode → int

The hash code for this object.

no setter, inherited

hideLines → bool

hide lines in 9 patch image

final

imageProvider → ImageProvider<Object>

image provider for example use AssetImage("assets/orange.9.png")

final

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

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.

inherited

debugFillProperties(DiagnosticPropertiesBuilder properties) → void

Add additional properties associated with the node.

inherited

getDefulteSize(dynamic paddBottomLeft, dynamic paddBottomRight, dynamic paddRightTop, dynamic paddRightBottom, dynamic width, dynamic heiget) → EdgeInsets

判断图片内容填充区域最小范围

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent 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

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.

inherited