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feat: add image example app #5

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feat: add image example app #5

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153 changes: 153 additions & 0 deletions cmd/image/main.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,153 @@
package main

import (
"fmt"
"image"
"image/jpeg"
_ "image/jpeg"
"image/png"
_ "image/png"
"log"
"os"

"gioui.org/app"
"gioui.org/font/gofont"
"gioui.org/io/system"
"gioui.org/layout"
"gioui.org/op"
"gioui.org/op/paint"
"gioui.org/widget"
"gioui.org/widget/material"
"gioui.org/x/explorer"
)

func main() {
go func() {
w := app.NewWindow()
if err := loop(w); err != nil {
log.Fatal(err)
}
os.Exit(0)
}()
app.Main()
}

type (
C = layout.Context
D = layout.Dimensions
)

// ImageResult is the results of trying to open an image. It may
// contain either an error or an image, but not both. The error
// should always be checked first.
type ImageResult struct {
Error error
Format string
Image image.Image
}

func loop(w *app.Window) error {
expl := explorer.NewExplorer(w)
var openBtn, saveBtn widget.Clickable
th := material.NewTheme(gofont.Collection())
imgChan := make(chan ImageResult)
saveChan := make(chan error)
var img ImageResult
var saveErr error
var ops op.Ops
for {
select {
case img = <-imgChan:
w.Invalidate()
case saveErr = <-saveChan:
w.Invalidate()
case e := <-w.Events():
expl.ListenEvents(e)
switch e := e.(type) {
case system.DestroyEvent:
return e.Err
case system.FrameEvent:
gtx := layout.NewContext(&ops, e)
if openBtn.Clicked() {
go func() {
file, err := expl.ChooseFile("png", "jpeg", "jpg")
if err != nil {
err = fmt.Errorf("failed opening image file: %w", err)
imgChan <- ImageResult{Error: err}
return
}
defer file.Close()
imgData, format, err := image.Decode(file)
if err != nil {
err = fmt.Errorf("failed decoding image data: %w", err)
imgChan <- ImageResult{Error: err}
return
}
imgChan <- ImageResult{Image: imgData, Format: format}
}()
}
if saveBtn.Clicked() {
go func(img ImageResult) {
if img.Error != nil {
saveChan <- fmt.Errorf("no image loaded, cannot save")
return
}
extension := "jpg"
switch img.Format {
case "png":
extension = "png"
}
file, err := expl.CreateFile("file." + extension)
if err != nil {
saveChan <- fmt.Errorf("failed exporting image file: %w", err)
return
}
defer func() {
saveChan <- file.Close()
}()
switch extension {
case "jpg":
if err := jpeg.Encode(file, img.Image, nil); err != nil {
saveChan <- fmt.Errorf("failed encoding image file: %w", err)
return
}
case "png":
if err := png.Encode(file, img.Image); err != nil {
saveChan <- fmt.Errorf("failed encoding image file: %w", err)
return
}
}
}(img)
}
layout.Flex{Axis: layout.Vertical}.Layout(gtx,
layout.Rigid(material.Button(th, &openBtn, "Open Image").Layout),
layout.Flexed(1, func(gtx C) D {
if img.Error == nil && img.Image == nil {
return D{}
} else if img.Error != nil {
return material.H6(th, img.Error.Error()).Layout(gtx)
}

return widget.Image{
Src: paint.NewImageOp(img.Image),
Fit: widget.Contain,
}.Layout(gtx)
}),
layout.Rigid(func(gtx C) D {
if img.Image == nil {
gtx.Queue = nil
}
return material.Button(th, &saveBtn, "Save Image").Layout(gtx)
}),
layout.Rigid(func(gtx C) D {
if saveErr == nil {
return D{}
}
return material.H6(th, saveErr.Error()).Layout(gtx)
}),
)
e.Frame(gtx.Ops)
}
}
}
}
7 changes: 5 additions & 2 deletions go.mod
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4,16 +4,19 @@ go 1.20

require (
gioui.org v0.0.0-20230512135434-8571b25ff7cb
gioui.org/x v0.0.0-20230426160849-752f112c7a59
github.com/blackjack/webcam v0.0.0-20230411204030-32744c21431f
)

require (
gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 // indirect
gioui.org/shader v1.0.6 // indirect
git.wow.st/gmp/jni v0.0.0-20210610011705-34026c7e22d0 // indirect
github.com/go-text/typesetting v0.0.0-20230413204129-b4f0492bf7ae // indirect
github.com/godbus/dbus/v5 v5.0.6 // indirect
golang.org/x/exp v0.0.0-20221012211006-4de253d81b95 // indirect
golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91 // indirect
golang.org/x/image v0.5.0 // indirect
golang.org/x/image v0.7.0 // indirect
golang.org/x/sys v0.7.0 // indirect
golang.org/x/text v0.7.0 // indirect
golang.org/x/text v0.9.0 // indirect
)
19 changes: 16 additions & 3 deletions go.sum
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6,41 +6,54 @@ gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 h1:AGDDxsJE1RpcXTAxPG2B4jrwVUJG
gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
gioui.org/shader v1.0.6 h1:cvZmU+eODFR2545X+/8XucgZdTtEjR3QWW6W65b0q5Y=
gioui.org/shader v1.0.6/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
gioui.org/x v0.0.0-20230426160849-752f112c7a59 h1:IdvHx1hSmuL9xs/p3rppWJnH01RXcBhz5HvB7pj9LAg=
gioui.org/x v0.0.0-20230426160849-752f112c7a59/go.mod h1:nMctdnZS2HKxfSXb+bCPnhw1n2LLsXoxtTarZjtIBuI=
git.wow.st/gmp/jni v0.0.0-20210610011705-34026c7e22d0 h1:bGG/g4ypjrCJoSvFrP5hafr9PPB5aw8SjcOWWila7ZI=
git.wow.st/gmp/jni v0.0.0-20210610011705-34026c7e22d0/go.mod h1:+axXBRUTIDlCeE73IKeD/os7LoEnTKdkp8/gQOFjqyo=
github.com/blackjack/webcam v0.0.0-20230411204030-32744c21431f h1:qBxp6Oz8y0AfeqjrYcHaYdfWQf+vUXAwgZ+GWnTtd/E=
github.com/blackjack/webcam v0.0.0-20230411204030-32744c21431f/go.mod h1:G0X+rEqYPWSq0dG8OMf8M446MtKytzpPjgS3HbdOJZ4=
github.com/go-text/typesetting v0.0.0-20230413204129-b4f0492bf7ae h1:LCcaQgYrnS+sx9Tc3oGUvbRBRt+5oFnKWakaxeAvNVI=
github.com/go-text/typesetting v0.0.0-20230413204129-b4f0492bf7ae/go.mod h1:KmrpWuSMFcO2yjmyhGpnBGQHSKAoEgMTSSzvLDzCuEA=
github.com/go-text/typesetting-utils v0.0.0-20230412163830-89e4bcfa3ecc h1:9Kf84pnrmmjdRzZIkomfjowmGUhHs20jkrWYw/I6CYc=
github.com/godbus/dbus/v5 v5.0.6 h1:mkgN1ofwASrYnJ5W6U/BxG15eXXXjirgZc7CLqkcaro=
github.com/godbus/dbus/v5 v5.0.6/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/exp v0.0.0-20221012211006-4de253d81b95 h1:sBdrWpxhGDdTAYNqbgBLAR+ULAPPhfgncLr1X0lyWtg=
golang.org/x/exp v0.0.0-20221012211006-4de253d81b95/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91 h1:ryT6Nf0R83ZgD8WnFFdfI8wCeyqgdXWN4+CkFVNPAT0=
golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91/go.mod h1:VjAR7z0ngyATZTELrBSkxOOHhhlnVUxDye4mcjx5h/8=
golang.org/x/image v0.5.0 h1:5JMiNunQeQw++mMOz48/ISeNu3Iweh/JaZU8ZLqHRrI=
golang.org/x/image v0.5.0/go.mod h1:FVC7BI/5Ym8R25iw5OLsgshdUBbT1h5jZTpA+mvAdZ4=
golang.org/x/image v0.7.0 h1:gzS29xtG1J5ybQlv0PuyfE3nmc6R4qB73m6LUUmvFuw=
golang.org/x/image v0.7.0/go.mod h1:nd/q4ef1AKKYl/4kft7g+6UyGbdiqWqTP1ZAbRoV7Rg=
golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/text v0.7.0 h1:4BRB4x83lYWy72KwLD/qYDuTu7q9PjSagHvijDw7cLo=
golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=