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Display Images File Handling Fyne GUI Golang tutorial 47

Display Images File Handling Fyne GUI Golang tutorial 47

This tutorial is for you if you Want to create an image Viewer app / software in Golang & Fyne.

You can open .jpg & .png files easily.

Dialog Box to open Files

dialog.NewFileOpen()

Input Output utility to ReadAll

data, _ := ioutil.ReadAll(uc)

Static Rosource take 2 arguments i.e name & content.
content is data we will receive from ioutil.ReadAll()

res := fyne.NewStaticResource(uc.URI().Name(), data)

Image widget to display image from static resource

img := canvas.NewImageFromResource(res)

Source Code

package main
// import fyne
import (
    "io/ioutil"
    "fyne.io/fyne/v2"
    "fyne.io/fyne/v2/app"
    "fyne.io/fyne/v2/canvas"
    "fyne.io/fyne/v2/dialog"
    "fyne.io/fyne/v2/storage"
    "fyne.io/fyne/v2/widget"
)
func main() {
    // New app
    a := app.New()
    // New title
    w := a.NewWindow("file Handling - Open Images")
    //resize
    w.Resize(fyne.NewSize(400, 400))
    btn := widget.NewButton("Open .jpg & .Png", func() {
        // dialog for opening files
        // 2 arguments
        fileDialog := dialog.NewFileOpen(
            // _ to ignore error
            func(uc fyne.URIReadCloser, _ error) {
                // reader to read data
                data, _ := ioutil.ReadAll(uc)
                // static resource
                // 2 arguments
                // first is file name (string)
                // second is data from reader
                res := fyne.NewStaticResource(uc.URI().Name(), data)
                // Now image widget to display our image
                img := canvas.NewImageFromResource(res)
                // setup new window for image and set content
                w := fyne.CurrentApp().NewWindow(uc.URI().Name())
                w.SetContent(img)
                // resize window
                w.Resize(fyne.NewSize(400, 400))
                w.Show() // display our image
            }, w)
        // filtering files
        fileDialog.SetFilter(
            // filter jpg and png
            // ignore rest of the files
            storage.NewExtensionFileFilter([]string{".png", ".jpg"}))
        fileDialog.Show()
        // we are done :)
    })
    // display button in parent window
    w.SetContent(btn)
    w.ShowAndRun()
}

 

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