QrCode class - cute_qr_code library

Constructors

QrCode({required String data, int squareSize = defaultSquareSize, int canvasSize = defaultQrCodeSize, int xOffset = defaultXOffset, int yOffset = defaultYOffset, QrCodeColorFunction? colorFn, QrCodeShapeFunction? shapeFn, QrCodeGraphicsFactory? graphicsFactory, ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.low, int? informationDensity, MaskPattern maskPattern = MaskPattern.pattern000, QrCodeHook? doBefore, QrCodeHook? doAfter, ImageProvider<Object>? logoProvider, double? logoWidth, double? logoHeight}): Creates a QrCode from raw data and styling parameters. 根据原始 data 与样式参数创建 QrCode。

Properties

canvasSize ↔ int: Output canvas side length in pixels. 输出画布边长（像素）。
getter/setter pair
colorFn → QrCodeColorFunction: Resolves foreground/background colors per module. 按模块解析前景/背景色。
final
data → String: Payload string encoded into the symbol. 编码进符号的载荷字符串。
final
errorCorrectionLevel → ErrorCorrectionLevel: Reed–Solomon error correction level for encoding. 编码所用的 RS 纠错等级。
final
graphics ↔ QrCodeGraphics: Default graphics buffer for render. render 使用的默认图形缓冲区。
getter/setter pair
graphicsFactory → QrCodeGraphicsFactory: Factory for raster backing stores used during render. 渲染时使用的光栅画布工厂。
final
hashCode → int: The hash code for this object.
no setterinherited
informationDensity ↔ int: QR version (type number, 1–40) used for this symbol. 本符号使用的 QR 版本号（类型号，1–40）。
latefinal
logoDrawHeight ↔ int?: Computed logo height used when drawing. 绘制时使用的 Logo 高度。
getter/setter pair
logoDrawWidth ↔ int?: Computed logo width used when drawing. 绘制时使用的 Logo 宽度。
getter/setter pair
logoHeight → double?: Logo draw height in pixels; defaults to image height. Logo 绘制高度（像素）；默认取图片高度。
final
logoProvider → ImageProvider<Object>?: Optional center logo image provider. 可选的中心 Logo 图片提供器。
final
logoWidth → double?: Logo draw width in pixels; defaults to image width. Logo 绘制宽度（像素）；默认取图片宽度。
final
maskPattern → MaskPattern: Mask pattern applied during matrix setup. 矩阵设置时应用的掩码图案。
final
qrCodeProcessor ↔ QrCodeProcessor: Encoder used to build rawData. 用于构建 rawData 的编码器。
getter/setter pair
rawData ↔ QrCodeRawData: Module matrix after encoding. 编码后的模块矩阵。
getter/setter pair
resolvedLogo ↔ Image?: Resolved logo image after prepare. prepare 后解析得到的 Logo 图片。
getter/setter pair
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
shapeFn → QrCodeShapeFunction: Draws each module shape (square, circle, rounded, etc.). 绘制各模块形状（方形、圆形、圆角等）。
final
squareSize ↔ int: Pixel size of one module in the internal buffer. 内部缓冲区中单个模块的像素尺寸。
getter/setter pair
xOffset → int: Horizontal paint offset in pixels. 水平绘制偏移（像素）。
final
yOffset → int: Vertical paint offset in pixels. 垂直绘制偏移（像素）。
final

Methods

fitIntoArea(int width, int height) → QrCode: Adjusts module and canvas size to fit width x height. 调整模块与画布尺寸以适配 width x height。
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
paintOntoCanvas(Canvas canvas, Size size) → void: Paints the QR code into canvas scaled to size without permanently resizing this instance. 将 QR 码绘制到 canvas 并按 size 缩放，不永久改变本实例尺寸。
prepare() → Future<void>: Resolves logoProvider for later drawing in render. 解析 logoProvider，供 render 时绘制 Logo。
render({QrCodeGraphics? qrCodeGraphics, int? xOffset, int? yOffset}) → QrCodeGraphics: Renders modules into qrCodeGraphics or the default graphics buffer. 将模块渲染到 qrCodeGraphics 或默认 graphics 缓冲区。
renderToBytes({QrCodeGraphics? qrCodeGraphics, int? xOffset, int? yOffset, String format = 'PNG'}) → Future<Uint8List>: Renders to encoded image bytes (PNG by default). 渲染为编码后的图片字节（默认 PNG）。
reset() → void: Clears render flags and resets the graphics buffer. 清除渲染标记并重置图形缓冲区。
resize(int size) → QrCode: Resizes the internal canvas to size and clears render flags. 将内部画布调整为 size 并清除渲染标记。
toString() → String: A string representation of this object.
override

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Methods

circles({required String data, QrCodeConfig config = const QrCodeConfig()}) → QrCode: Creates a QR code with circular modules. 创建圆形模块的 QR 码。
create({required String data, QrCodeConfig config = const QrCodeConfig()}) → QrCode: Builds a QrCode from data and config. 根据 data 与 config 构建 QrCode。
custom({required String data, required QrCodeConfig config}) → QrCode: Creates a QR code with a custom QrCodeConfig.shapeFunction. 使用自定义 QrCodeConfig.shapeFunction 创建 QR 码。
roundedSquares({required String data, QrCodeConfig config = const QrCodeConfig()}) → QrCode: Creates a QR code with rounded-square modules. 创建圆角方形模块的 QR 码。
squares({required String data, QrCodeConfig config = const QrCodeConfig()}) → QrCode: Creates a QR code with square modules. 创建方形模块的 QR 码。

Constants

defaultQrCodeSize → const int: Sentinel canvas size; actual size is computed from modules. 画布尺寸哨兵值；实际尺寸由模块数计算。
defaultSquareSize → const int: Default module pixel size used during encoding layout. 编码布局时使用的默认模块像素尺寸。
defaultXOffset → const int: Default horizontal offset when painting. 绘制时的默认水平偏移。
defaultYOffset → const int: Default vertical offset when painting. 绘制时的默认垂直偏移。