go: add current comic logic

xkcdreader/app.go

@@ -4,7 +4,6 @@
 package xkcdreader
 
 import (
-	"fmt"
 	"log"
 	"os"
 
@@ -12,6 +11,7 @@ import (
 	"fyne.io/fyne/v2/app"
 	"fyne.io/fyne/v2/canvas"
 	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/data/binding"
 	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/storage"
 	"fyne.io/fyne/v2/theme"
@@ -25,6 +25,8 @@ const appGreeting = "welcome to go-xkcdreader"
 var (
 	a            fyne.App
 	latestComic  = xkcd.GetLatest()
+	currentComic = latestComic
+	cc           xkcdcomic
 )
 
 // RunApp performs sets up and runs the main application.
@@ -100,60 +102,98 @@ func makeTabs() *container.AppTabs {
 }
 
 func makeBrowseUI() *fyne.Container {
+	err := setCurrentComicBinding()
+	if err != nil {
+		log.Println(err)
+	}
+
+	cc.pic = getImg(currentComic.Img, false)
+
 	// container for the image and surrounding elements
 	imgC := container.New(
 		layout.NewHBoxLayout(),
 		widget.NewButtonWithIcon("", theme.NavigateBackIcon(), func() {
 			log.Println("Previous comic")
+			showPrevious()
+			cc.refreshComicPic(getImg(currentComic.Img, false))
 		}),
 		layout.NewSpacer(),
 		container.NewCenter(
 			// TODO(me): dynamically replace placeholder text with image once
 			// fetched...
 			// widget.NewLabel("img placeholder"),
-			getImg(latestComic.Img, false),
+			cc.pic,
 		),
 		layout.NewSpacer(),
 		widget.NewButtonWithIcon("", theme.NavigateNextIcon(), func() {
 			log.Println("Next comic")
+			showNext()
 		}),
 	)
 
+	year := widget.NewLabelWithData(comicCurrent.year)
+	month := widget.NewLabelWithData(comicCurrent.month)
+	day := widget.NewLabelWithData(comicCurrent.day)
+	title := widget.NewLabelWithData(comicCurrent.title)
+	num := widget.NewLabelWithData(
+		binding.IntToString(comicCurrent.num),
+	)
+	altText := widget.NewLabelWithData(comicCurrent.alt)
+
+	title.TextStyle.Bold = true
+	num.TextStyle.Monospace = true
+	altText.TextStyle.Italic = true
+	altText.Wrapping = fyne.TextTruncate
+	altText.Alignment = fyne.TextAlignCenter
+
 	browseUI := container.New(
 		layout.NewVBoxLayout(),
-		layout.NewSpacer(),
+		// layout.NewSpacer(),
 		container.NewCenter(
 			container.NewVBox(
-				&widget.Label{
-					Text: "published on " +
-						fmt.Sprint(
-							latestComic.Year, "-",
-							latestComic.Month, "-",
-							latestComic.Day,
-						),
-					TextStyle: fyne.TextStyle{Italic: true},
-				},
+				///&widget.Label{
+				///	Text: "published on " +
+				///		fmt.Sprint(
+				///			currentComic.Year, "-",
+				///			currentComic.Month, "-",
+				///			currentComic.Day,
+				///		),
+				///	TextStyle: fyne.TextStyle{Italic: true},
+				///},
 				container.NewHBox(
-					&widget.Label{
-						Text:      latestComic.Title,
-						TextStyle: fyne.TextStyle{Bold: true},
-					},
-					&widget.Label{
-						Text:      "(#" + fmt.Sprint(latestComic.Num) + ")",
-						TextStyle: fyne.TextStyle{Monospace: true},
-					},
+					year, month, day,
+				),
+				container.NewHBox(
+					///&widget.Label{
+					///	Text:      currentComic.Title,
+					///	TextStyle: fyne.TextStyle{Bold: true},
+					///},
+					///&widget.Label{
+					///	Text:      "(#" + fmt.Sprint(currentComic.Num) + ")",
+					///	TextStyle: fyne.TextStyle{Monospace: true},
+					///},
+					title,
+					num,
 				),
 			),
 		),
 		imgC,
-		layout.NewSpacer(),
+		// layout.NewSpacer(),
 		container.NewCenter(
 			// comic "alt text"
-			&widget.Label{
-				Text:      latestComic.Alt,
-				TextStyle: fyne.TextStyle{Italic: true},
-			},
+			///&widget.Label{
+			///	Text:      currentComic.Alt,
+			///	TextStyle: fyne.TextStyle{Italic: true},
+			///},
+			// container.NewCenter(
+			// container.NewAdaptiveGrid(
+			// 1,
+			// layout.NewSpacer(),
+			altText,
+			layout.NewSpacer(),
+			// ),
 		),
+		layout.NewSpacer(),
 	)
 
 	return browseUI
@@ -207,6 +247,8 @@ func getImg(imgURI string, local bool) *canvas.Image {
 	// get the actual image
 	img := canvas.NewImageFromURI(preImg)
 
+	log.Println("getImg: img name: ", img.Resource.Name())
+
 	if img.Resource == nil {
 		log.Println("error fetching the image file of the latest comic")
 	}

xkcdreader/comic.go

@@ -0,0 +1,230 @@
+// Copyright 2022 wanderer <a_mirre at utb dot cz>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package xkcdreader
+
+import (
+	"log"
+
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/data/binding"
+	x "git.dotya.ml/wanderer/go-xkcdreader/xkcdreader/xkcd"
+)
+
+type xkcdcomic struct {
+	pic *canvas.Image
+}
+
+var comicCurrent = struct {
+	num        binding.Int `default:"0"`
+	alt        binding.String
+	day        binding.String
+	img        binding.String
+	link       binding.String
+	month      binding.String
+	news       binding.String
+	safeTitle  binding.String
+	title      binding.String
+	transcript binding.String
+	year       binding.String
+}{
+	num:        binding.NewInt(),
+	alt:        binding.NewString(),
+	day:        binding.NewString(),
+	img:        binding.NewString(),
+	link:       binding.NewString(),
+	month:      binding.NewString(),
+	news:       binding.NewString(),
+	safeTitle:  binding.NewString(),
+	title:      binding.NewString(),
+	transcript: binding.NewString(),
+	year:       binding.NewString(),
+}
+
+// showPrevious loads and shows a previous comic.
+// nolint: dupl
+func showPrevious() {
+	previous := x.GetPrevious(currentComic.Num)
+
+	if previous != nil {
+		log.Printf("current num pre: %d", currentComic.Num)
+
+		if err := comicCurrent.num.Set(previous.Num); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.alt.Set(previous.Alt); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.day.Set(previous.Day); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.img.Set(previous.Img); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.link.Set(previous.Link); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.month.Set(previous.Month); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.news.Set(previous.News); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.safeTitle.Set(previous.SafeTitle); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.title.Set(previous.Title); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.transcript.Set(previous.Transcript); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.year.Set(previous.Year); err != nil {
+			log.Println(err)
+		}
+
+		cc.refreshComicPic(getImg(previous.Img, false))
+
+		currentComic = previous
+
+		log.Printf("current num post: %d", currentComic.Num)
+	} else {
+		log.Println("no previous comic")
+	}
+}
+
+// showNext loads and shows a next comic.
+// nolint: dupl
+func showNext() {
+	next := x.GetNext(currentComic.Num)
+
+	if next != nil {
+		log.Printf("current num pre: %d", currentComic.Num)
+
+		if err := comicCurrent.num.Set(next.Num); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.alt.Set(next.Alt); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.day.Set(next.Day); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.img.Set(next.Img); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.link.Set(next.Link); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.month.Set(next.Month); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.news.Set(next.News); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.safeTitle.Set(next.SafeTitle); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.title.Set(next.Title); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.transcript.Set(next.Transcript); err != nil {
+			log.Println(err)
+		}
+
+		if err := comicCurrent.year.Set(next.Year); err != nil {
+			log.Println(err)
+		}
+
+		cc.refreshComicPic(getImg(next.Img, false))
+
+		currentComic = next
+
+		log.Printf("current num post: %d", currentComic.Num)
+	} else {
+		log.Println("no next comic")
+	}
+}
+
+func (xc *xkcdcomic) refreshComicPic(pic *canvas.Image) {
+	xc.pic.Resource = pic.Resource
+	xc.pic.Refresh()
+}
+
+func setCurrentComicBinding() error {
+	err := comicCurrent.num.Set(currentComic.Num)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.alt.Set(currentComic.Alt)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.day.Set(currentComic.Day)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.img.Set(currentComic.Img)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.link.Set(currentComic.Link)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.month.Set(currentComic.Month)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.news.Set(currentComic.News)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.safeTitle.Set(currentComic.SafeTitle)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.title.Set(currentComic.Title)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.transcript.Set(currentComic.Transcript)
+	if err != nil {
+		return err
+	}
+
+	err = comicCurrent.year.Set(currentComic.Year)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

xkcdreader/xkcd/xkcd.go

@@ -35,3 +35,32 @@ func GetComic(num int) *xkcd.Comic {
 
 	return comic
 }
+
+// GetPrevious returns a previous comic relative to the one provided.
+func GetPrevious(current int) *xkcd.Comic {
+	if current == 1 {
+		log.Printf("error: there is no previous comic available, requested: '%d'",
+			current-1)
+		return GetComic(1)
+	}
+
+	previous := GetComic(current - 1)
+
+	if previous == nil {
+		return GetComic(current)
+	}
+
+	return previous
+}
+
+// GetNext returns a next comic relative to the one currently provided.
+func GetNext(current int) *xkcd.Comic {
+	next := GetComic(current + 1)
+
+	if next == nil {
+		log.Printf("error: there is no next comic available, requested: '%d'",
+			current+1)
+	}
+
+	return next
+}