svge/main.go at master · stuartmscott/svge · GitHub

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package main

import (
	"bytes"
	"fmt"
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/canvas"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/storage"
	"fyne.io/fyne/v2/theme"
	"fyne.io/fyne/v2/widget"
	"github.com/srwiley/oksvg"
	"github.com/srwiley/rasterx"
	"image"
	"io/ioutil"
)

func main() {
	a := app.New()
	w := a.NewWindow("SVG Editor")

	var d []byte
	l := &widget.Label{
		Wrapping: fyne.TextTruncate,
	}
	v := &canvas.Raster{
		Generator: func(width, height int) image.Image {
			l.SetText("")
			output := image.NewNRGBA(image.Rect(0, 0, width, height))
			if len(d) == 0 {
				l.SetText("No Data")
				return output
			}
			icon, err := oksvg.ReadIconStream(bytes.NewReader(d))
			if err != nil {
				l.SetText(err.Error())
				return output
			}
			inputW, inputH := icon.ViewBox.W, icon.ViewBox.H
			iconAspect := inputW / inputH
			viewAspect := float64(width) / float64(height)
			outputW, outputH := width, height
			if viewAspect > iconAspect {
				outputW = int(float64(height) * iconAspect)
			} else if viewAspect < iconAspect {
				outputH = int(float64(width) / iconAspect)
			}
			scanner := rasterx.NewScannerGV(int(inputW), int(inputH), output, output.Bounds())
			raster := rasterx.NewDasher(width, height, scanner)
			icon.SetTarget(0, 0, float64(outputW), float64(outputH))
			icon.Draw(raster, 1)
			defer func() {
				if r := recover(); r != nil {
					l.SetText(fmt.Sprintf("Crash when rendering SVG: %v", r))
				}
			}()
			return output
		},
	}
	e := &widget.Entry{
		MultiLine: true,
		OnChanged: func(data string) {
			d = []byte(data)
			v.Refresh()
		},
		Wrapping: fyne.TextWrapBreak,
	}
	s := container.NewHSplit(container.NewVScroll(e), container.NewScroll(v))
	t := widget.NewToolbar(
		widget.NewToolbarAction(theme.ContentAddIcon(), func() {
			e.SetText("")
			w.SetTitle("SVG Editor")
		}),
		widget.NewToolbarAction(theme.FileIcon(), func() {
			fd := dialog.NewFileOpen(func(reader fyne.URIReadCloser, err error) {
				if err != nil {
					dialog.ShowError(err, w)
					return
				}
				if reader == nil {
					return
				}
				data, err := ioutil.ReadAll(reader)
				if err != nil {
					dialog.ShowError(err, w)
					return
				}
				e.SetText(string(data))
				w.SetTitle("SVG Editor - " + reader.URI().Name())
			}, w)
			fd.SetFilter(storage.NewExtensionFileFilter([]string{".svg"}))
			fd.Show()
		}),
		widget.NewToolbarAction(theme.DocumentSaveIcon(), func() {
			fd := dialog.NewFileSave(func(writer fyne.URIWriteCloser, err error) {
				if err != nil {
					dialog.ShowError(err, w)
					return
				}
				if writer == nil {
					return
				}
				if _, err := writer.Write(d); err != nil {
					dialog.ShowError(err, w)
					return
				}
			}, w)
			fd.Show()
		}),
	)
	w.SetContent(container.NewBorder(t, l, nil, nil, s))
	w.CenterOnScreen()
	w.Resize(fyne.NewSize(800, 600))
	w.ShowAndRun()
}