image

Documentation

Index

• Variables
• type HttpClient
  • func (c *HttpClient) Download(location string) (string, io.ReadCloser, error)
• type ImageSource
  • func ImageFromBuf(src []byte) *ImageSource
  • func ImageFromFile(src string) *ImageSource
  • func (img *ImageSource) Error() error
  • func (img *ImageSource) ImageOp(size image.Point) *paint.ImageOp
  • func (img *ImageSource) IsNetworkImg() bool
  • func (img *ImageSource) ScaleByRatio(ratio float32) (*paint.ImageOp, error)
  • func (img *ImageSource) ScaleBySize(size image.Point) (*paint.ImageOp, error)
  • func (img *ImageSource) Size() image.Point
• type ImageStyle
  • func NewImage(src *ImageSource) *ImageStyle
  • func (img *ImageStyle) Layout(gtx layout.Context) layout.Dimensions

Variables

var (
	// Change this if you want to load larger images from the web. Default max size is 10M.
	MaxDownloadSize = 1024 * 1024 * 10

	// Timeout for http request.
	DownloadTimeout = time.Second * 10
)

Types

type HttpClient

type HttpClient struct {
	// contains filtered or unexported fields
}

Because of network anti crawler policies applied by sites, we have to disguising out http client as browsers, see below link for details: https://req.cool/blog/supported-http-fingerprint-impersonation-to-bypass-anti-crawler-detection-effortlessly/

func (*HttpClient) Download

func (c *HttpClient) Download(location string) (string, io.ReadCloser, error)

type ImageSource

type ImageSource struct {
	// contains filtered or unexported fields
}

ImageSource wraps a local or remote image. Only jpeg and png format for is supported. When displaying, image scaled by the specified size and cached.

func ImageFromBuf

func ImageFromBuf(src []byte) *ImageSource

ImageFromBuf loads an image from bytes buffer.

func ImageFromFile

func ImageFromFile(src string) *ImageSource

ImageFromFile load an image from local filesystem or from network.

func (*ImageSource) Error

func (img *ImageSource) Error() error

func (*ImageSource) ImageOp

func (img *ImageSource) ImageOp(size image.Point) *paint.ImageOp

ImageOp scales the src image to make it fit within the constraint specified by size and convert it to Gio ImageOp. If size has zero value of image Point, image is not scaled.

func (*ImageSource) IsNetworkImg

func (img *ImageSource) IsNetworkImg() bool

IsNetworkImg check if this image is loaded/to be loaded from network.

func (*ImageSource) ScaleByRatio

func (img *ImageSource) ScaleByRatio(ratio float32) (*paint.ImageOp, error)

func (*ImageSource) ScaleBySize

func (img *ImageSource) ScaleBySize(size image.Point) (*paint.ImageOp, error)

func (*ImageSource) Size

func (img *ImageSource) Size() image.Point

type ImageStyle

type ImageStyle struct {

	//Size   image.Point
	Radius   unit.Dp
	Fit      widget.Fit
	Position layout.Direction
	// contains filtered or unexported fields
}

ImageStyle is a widget displaying an image from an ImageSource. Styling parameters can be set after construction. Displayed size is specified by the max constraints of the widget.

func NewImage

func NewImage(src *ImageSource) *ImageStyle

func (*ImageStyle) Layout

func (img *ImageStyle) Layout(gtx layout.Context) layout.Dimensions