init commit

.gitignore

@@ -0,0 +1,7 @@
+fyne.syso
+*.exe
+*.so
+/release
+pkg
+debug
+*.dll

.vscode/launch.json

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+{
+    // 使用 IntelliSense 了解相关属性。 
+    // 悬停以查看现有属性的描述。
+    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${workspaceFolder}",
+            "env": {},
+            "args": []
+        }
+    ]
+}

.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "type": "shell",
+    "echoCommand": true,
+    "options": {
+        "cwd": "${workspaceFolder}",
+    },
+    "tasks": [
+        {
+            "label": "build",
+            "command": "go build",
+            "args": [
+                "-x"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        },
+        {
+            "label": "test",
+            "command": "go test",
+            "args": [],
+            "group": "test"
+        },
+        {
+            "label": "publish",
+            "command": "fyne package",
+            "args": [
+                "-release",
+                "-name",
+                "${workspaceFolderBasename}"
+            ],
+            "group": "build",
+            "problemMatcher": [
+                "$go"
+            ]
+        }
+    ]
+}

README.md

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+# About
+A fyne project, can convert pdf to image.
+# How To Build
+- Install  [fyne](https://fyne.io) by instructions
+- Download [Pdfium binaries](https://github.com/bblanchon/pdfium-binaries) and config the pkg-config 
+# References
+[1] [go-pdfium-render](https://github.com/brunsgaard/go-pdfium-render)

go.mod

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+module github.com/slory7/gtoolui
+
+go 1.14
+
+require (
+	fyne.io/fyne v1.2.1-0.20200508113208-04d654b06855
+	github.com/containerd/containerd v1.3.4
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/fyne-io/mobile v0.0.2-0.20200511203347-825e44fe5a95 // indirect
+	github.com/go-gl/glfw v0.0.0-20200420212212-258d9bec320e // indirect
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200420212212-258d9bec320e // indirect
+	github.com/godbus/dbus/v5 v5.0.3 // indirect
+	github.com/google/martian v2.1.0+incompatible
+	github.com/josephspurrier/goversioninfo v0.0.0-20200309025242-14b0ab84c6ca // indirect
+	github.com/lucor/goinfo v0.0.0-20200401173949-526b5363a13a // indirect
+	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
+	github.com/nuveo/log v0.0.0-20190430190217-44d02db6bdf8
+	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
+	github.com/opencontainers/image-spec v1.0.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rjeczalik/pkgconfig v0.0.0-20190903131546-94d388dab445 // indirect
+	github.com/sirupsen/logrus v1.6.0 // indirect
+	github.com/srwiley/rasterx v0.0.0-20200120212402-85cb7272f5e9 // indirect
+	github.com/stretchr/testify v1.5.1 // indirect
+	golang.org/x/image v0.0.0-20200430140353-33d19683fad8 // indirect
+	golang.org/x/net v0.0.0-20200506145744-7e3656a0809f // indirect
+	golang.org/x/sys v0.0.0-20200511232937-7e40ca221e25 // indirect
+	golang.org/x/text v0.3.2 // indirect
+	golang.org/x/tools v0.0.0-20200512001501-aaeff5de670a // indirect
+	google.golang.org/grpc v1.29.1 // indirect
+	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	gopkg.in/yaml.v2 v2.2.8 // indirect
+)

main.go

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+package main
+
+import (
+	"os"
+	"runtime"
+
+	"fyne.io/fyne"
+	"fyne.io/fyne/app"
+	"fyne.io/fyne/theme"
+	"github.com/slory7/gtoolui/screens/home"
+)
+
+func init() {
+	if runtime.GOOS == "windows" {
+		windir := os.Getenv("windir")
+		os.Setenv("FYNE_FONT", windir+"\\fonts\\msyh.ttc")
+	}
+}
+
+func main() {
+	a := app.NewWithID("GToolUI")
+	a.SetIcon(theme.FyneLogo())
+	a.Settings().SetTheme(theme.LightTheme())
+
+	w := a.NewWindow("工具包")
+	h := home.NewHome()
+	w.SetContent(h.UILayout(w))
+
+	w.Resize(fyne.NewSize(850, 650))
+	w.SetFixedSize(true)
+	w.CenterOnScreen()
+	w.SetMaster()
+	w.ShowAndRun()
+}

screens/home/home.go

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+// Package home is the home screen of this app
+package home
+
+import (
+	"fmt"
+	"image/jpeg"
+	"image/png"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"fyne.io/fyne"
+	"github.com/slory7/gtoolui/third-parties/pdfium"
+	"github.com/slory7/gtoolui/utils/ui"
+)
+
+// Home page
+type Home struct {
+	win                    fyne.Window
+	pdfFile, pdfFolder     string
+	pdfFileNameChanged     chan string
+	pageRange, imageFormat string
+	imageScale             int
+	pdfIsConverting        chan bool
+}
+
+// NewHome is used to new it
+func NewHome() Home {
+	p := fyne.CurrentApp().Preferences()
+	imgf := p.StringWithFallback("imageFormat", "png")
+	imgs := p.IntWithFallback("imageScale", 200)
+	return Home{
+		pdfFileNameChanged: make(chan string),
+		pdfIsConverting:    make(chan bool),
+		imageFormat:        imgf,
+		imageScale:         imgs,
+	}
+}
+
+func (p *Home) fileInputChanged(s string) {
+	ltrChar := "\u202a"
+	s = strings.TrimLeft(s, ltrChar)
+	if len(s) > 0 && strings.HasSuffix(s, ".pdf") {
+		if dir, file := filepath.Split(s); dir != "" {
+			p.pdfFolder = dir
+			p.pdfFile = s
+			p.pdfFileNameChanged <- file
+		} else if p.pdfFolder != "" {
+			p.pdfFile = filepath.Join(p.pdfFolder, s)
+		}
+		p.win.SetTitle(p.pdfFile)
+	}
+}
+
+func (p *Home) showPDFFileOpen() {
+	ui.ShowFileOpen(p.win, func(fname, fpath string, err error) {
+		if err != nil {
+			ui.ShowError(err, p.win)
+		} else if fname != "" {
+			p.pdfFileNameChanged <- fname
+			p.pdfFile = fpath
+			p.pdfFolder = filepath.Dir(p.pdfFile)
+			p.win.SetTitle(p.pdfFile)
+		}
+	})
+}
+
+func (p *Home) convertPDF() {
+	if p.pdfFile != "" {
+		bytesPDF, err := ioutil.ReadFile(p.pdfFile)
+		if err != nil {
+			ui.ShowError(err, p.win)
+		} else {
+			p.pdfIsConverting <- true
+
+			pdfium.InitLibrary()
+			d, err := pdfium.NewDocument(&bytesPDF)
+			if err != nil {
+				ui.ShowError(err, p.win)
+			} else {
+				ext := filepath.Ext(p.pdfFile)
+				imgfileFormat := strings.TrimRight(p.pdfFile, ext) + "_%d." + p.imageFormat
+				pagecount := d.GetPageCount()
+				convertedCount := 0
+				if p.pageRange != "" {
+					if strings.Contains(p.pageRange, ",") {
+						for _, pg := range strings.Split(p.pageRange, ",") {
+							if pgnum, _ := strconv.Atoi(pg); pgnum > 0 {
+								if pgnum > pagecount {
+									pgnum = pagecount
+								}
+								renderPDFPageToImageFile(d, fmt.Sprintf(imgfileFormat, pgnum), pgnum-1, p.imageScale)
+								convertedCount++
+							}
+						}
+					} else if strings.Contains(p.pageRange, "-") {
+						arr := strings.Split(p.pageRange, "-")
+						from, _ := strconv.Atoi(arr[0])
+						to, _ := strconv.Atoi(arr[1])
+						if to == 0 {
+							to = pagecount
+						}
+						if from <= to {
+							if from > pagecount {
+								from = pagecount
+							}
+							if to > pagecount {
+								to = pagecount
+							}
+							for n := from; n <= to; n++ {
+								renderPDFPageToImageFile(d, fmt.Sprintf(imgfileFormat, n), n-1, p.imageScale)
+								convertedCount++
+							}
+						}
+					} else {
+						if pgnum, _ := strconv.Atoi(p.pageRange); pgnum > 0 {
+							if pgnum > pagecount {
+								pgnum = pagecount
+							}
+							renderPDFPageToImageFile(d, fmt.Sprintf(imgfileFormat, pgnum), pgnum-1, p.imageScale)
+							convertedCount++
+						}
+					}
+				} else {
+					for n := 0; n < pagecount; n++ {
+						renderPDFPageToImageFile(d, fmt.Sprintf(imgfileFormat, n+1), n, p.imageScale)
+						convertedCount++
+					}
+				}
+				d.Close()
+				ui.ShowInformation("操作完成", fmt.Sprintf("转换了%d页", convertedCount), p.win)
+			}
+			pdfium.DestroyLibrary()
+
+			p.pdfIsConverting <- false
+		}
+	}
+}
+
+func renderPDFPageToImageFile(d *pdfium.Document, imageFile string, pageIndex int, scale int) (err error) {
+	img := d.RenderPage(pageIndex, float64(scale)/100)
+	f, err := os.Create(imageFile)
+	if err != nil {
+		return
+	}
+	if strings.HasSuffix(imageFile, ".jpg") {
+		err = jpeg.Encode(f, img, &jpeg.Options{Quality: 80})
+	} else if strings.HasSuffix(imageFile, ".png") {
+		err = png.Encode(f, img)
+	}
+	defer f.Close()
+	return
+}

screens/home/home_ui.go

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+package home
+
+import (
+	"fmt"
+
+	"fyne.io/fyne"
+	"fyne.io/fyne/layout"
+	"fyne.io/fyne/theme"
+	"fyne.io/fyne/widget"
+)
+
+// UILayout is the layout ui func
+func (p *Home) UILayout(win fyne.Window) *fyne.Container {
+	p.win = win
+	ltitle := widget.NewLabel("PDF转图片：")
+	ltitle.Alignment = fyne.TextAlignLeading
+	txtFile := widget.NewEntry()
+	txtFile.SetPlaceHolder("请输入PDF文件路径")
+	txtFile.OnChanged = p.fileInputChanged
+	btnBrowse := widget.NewButtonWithIcon("浏览", theme.FolderOpenIcon(), p.showPDFFileOpen)
+	rowFile := widget.NewHBox(txtFile, btnBrowse)
+
+	lPageRange := widget.NewLabel("页码范围")
+	txtPageRange := widget.NewEntry()
+	txtPageRange.SetPlaceHolder("1,3,5 或 2-10 或 3-")
+	txtPageRange.OnChanged = func(s string) { p.pageRange = s }
+	rowPageRange := widget.NewHBox(lPageRange, txtPageRange)
+
+	lselectFormat := widget.NewLabel("图片格式")
+	selectFormat := widget.NewSelect([]string{"png", "jpg"}, func(s string) {
+		p.imageFormat = s
+		fyne.CurrentApp().Preferences().SetString("imageFormat", p.imageFormat)
+	})
+	selectFormat.Selected = p.imageFormat
+	rowFormat := widget.NewHBox(lselectFormat, selectFormat)
+	ssacle := "缩放比例 %d%%"
+	lsliderScale := widget.NewLabel(fmt.Sprintf(ssacle, p.imageScale))
+	sliderScale := widget.NewSlider(1, 400)
+	sliderScale.Value = float64(p.imageScale)
+	sliderScale.OnChanged = func(v float64) {
+		p.imageScale = int(v)
+		fyne.CurrentApp().Preferences().SetInt("imageScale", p.imageScale)
+		lsliderScale.Text = fmt.Sprintf(ssacle, p.imageScale)
+		lsliderScale.Refresh()
+	}
+	//sliderScale.Resize(fyne.NewSize(200, 50))
+	//rowScale := widget.NewHBox(lsliderScale, sliderScale)
+
+	btnConvert := widget.NewButtonWithIcon("转换", theme.SearchReplaceIcon(), p.convertPDF)
+
+	l := fyne.NewContainerWithLayout(layout.NewVBoxLayout(),
+		ltitle,
+		rowFile,
+		rowPageRange,
+		rowFormat,
+		lsliderScale,
+		sliderScale,
+		layout.NewSpacer(),
+		btnConvert,
+	)
+
+	go func() {
+		for {
+			txtFile.Text = <-p.pdfFileNameChanged
+			txtFile.Refresh()
+		}
+	}()
+	go func() {
+		for b := range p.pdfIsConverting {
+			if b {
+				btnConvert.SetText("转换中。。。")
+				btnConvert.Disable()
+			} else {
+				btnConvert.SetText("转换")
+				btnConvert.Enable()
+			}
+		}
+	}()
+
+	return l
+}