Add GTK application implementation

internal/gui/albumheaderbar.go

@@ -0,0 +1,42 @@
+package gui
+
+import (
+	"strings"
+
+	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+	"suruatoel.xyz/mcg/internal/common"
+)
+
+type albumHeaderbar struct {
+	*adw.Bin
+	titleLabel  *gtk.Label
+	artistLabel *gtk.Label
+	closeButton *gtk.Button
+}
+
+func newAlbumHeaderbar() *albumHeaderbar {
+	bar := albumHeaderbar{}
+	bar.loadWidgets()
+
+	return &bar
+}
+
+func (b *albumHeaderbar) loadWidgets() {
+	builder := gtk.NewBuilderFromString(data.AlbumHeaderbarXML)
+
+	b.Bin = builder.GetObject("McgAlbumHeaderbar").Cast().(*adw.Bin)
+	b.titleLabel = builder.GetObject("standalone_title").Cast().(*gtk.Label)
+	b.artistLabel = builder.GetObject("standalone_artist").Cast().(*gtk.Label)
+	b.closeButton = builder.GetObject("close_button").Cast().(*gtk.Button)
+}
+
+func (b *albumHeaderbar) SetAlbum(album *common.Album) {
+	b.titleLabel.SetText(album.Title())
+	b.artistLabel.SetText(strings.Join(album.Artists(), ", "))
+}
+
+func (b *albumHeaderbar) ConnectClose(callback func()) {
+	b.closeButton.ConnectClicked(callback)
+}

internal/gui/application.go

@@ -0,0 +1,151 @@
+package gui
+
+import (
+	"log"
+	"os"
+
+	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
+	"github.com/diamondburned/gotk4/pkg/gdk/v4"
+	"github.com/diamondburned/gotk4/pkg/gio/v2"
+	"github.com/diamondburned/gotk4/pkg/glib/v2"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+	"suruatoel.xyz/mcg/internal/client"
+	"suruatoel.xyz/mcg/internal/i18n"
+)
+
+type Application struct {
+	*gtk.Application
+	window      *mainWindow
+	aboutDialog *adw.AboutDialog
+	config      Configuration
+	configErr   error
+}
+
+func NewApplication() *Application {
+	app := Application{
+		Application: gtk.NewApplication("xyz.suruatoel.mcg", gio.ApplicationFlagsNone),
+	}
+	app.ConnectStartup(app.onStartup)
+	app.ConnectActivate(app.onActivate)
+	app.ConnectShutdown(app.onShutdown)
+
+	return &app
+}
+
+func (a *Application) onStartup() {
+	a.setDefaultSettings()
+	a.loadCSS()
+	a.registerShortcuts()
+	a.registerActions()
+	a.loadConfig()
+}
+
+func (a *Application) loadConfig() {
+	a.config = Configuration{
+		Host:      "localhost",
+		Port:      6600,
+		Panel:     "library",
+		SortField: "year",
+		SortDesc:  false,
+	}
+
+	a.configErr = readConfig(&a.config)
+}
+
+func (a *Application) setDefaultSettings() {
+	styleManager := adw.StyleManagerGetDefault()
+	styleManager.SetColorScheme(adw.ColorSchemePreferDark)
+}
+
+func (a *Application) loadCSS() {
+	styleProvider := gtk.NewCSSProvider()
+	styleProvider.LoadFromString(data.MainCSS)
+
+	gtk.StyleContextAddProviderForDisplay(
+		gdk.DisplayGetDefault(),
+		styleProvider,
+		gtk.STYLE_PROVIDER_PRIORITY_APPLICATION,
+	)
+}
+
+func (a *Application) registerShortcuts() {
+	a.SetAccelsForAction("window.close", []string{"<primary>q"})
+	a.SetAccelsForAction("win.show-help-overlay", []string{"<primary>k"})
+	a.SetAccelsForAction("app.info", []string{"<primary>i"})
+	a.SetAccelsForAction("win.connect", []string{"<primary>c"})
+	a.SetAccelsForAction("win.play", []string{"<primary>p"})
+	a.SetAccelsForAction("win.clear-playlist", []string{"<primary>r"})
+	a.SetAccelsForAction("win.toggle-fullscreen", []string{"F11"})
+	a.SetAccelsForAction("win.search-library", []string{"<primary>f"})
+	a.SetAccelsForAction("win.panel(\"server\")", []string{"<primary>KP_1"})
+	a.SetAccelsForAction("win.panel(\"cover\")", []string{"<primary>KP_2"})
+	a.SetAccelsForAction("win.panel(\"playlist\")", []string{"<primary>KP_3"})
+	a.SetAccelsForAction("win.panel(\"library\")", []string{"<primary>KP_4"})
+}
+
+func (a *Application) registerActions() {
+	infoAction := gio.NewSimpleAction("info", nil)
+	infoAction.ConnectActivate(func(_ *glib.Variant) {
+		a.showAboutDialog()
+	})
+	a.AddAction(infoAction)
+}
+
+func (a *Application) showAboutDialog() {
+	if a.aboutDialog == nil {
+		a.aboutDialog = a.newAboutDialog()
+	}
+
+	a.aboutDialog.Present(a.window)
+}
+
+func (a *Application) newAboutDialog() *adw.AboutDialog {
+	dialog := adw.NewAboutDialog()
+	dialog.SetApplicationName("CoverGrid")
+	dialog.SetApplicationIcon("xyz.suruatoel.mcg")
+	dialog.SetVersion(a.Version())
+	dialog.SetComments(i18n.T("CoverGrid is a client for the Music Player Daemon, focusing on albums instead of single tracks."))
+	dialog.SetWebsite("https://www.suruatoel.xyz/codes/mcg")
+	dialog.SetLicenseType(gtk.LicenseGPL30)
+	dialog.SetIssueURL("https://git.suruatoel.xyz/coderkun/mcg")
+
+	return dialog
+}
+
+func (a *Application) onActivate() {
+	if a.window == nil {
+		a.window = newMainWindow(a.Application, a.config)
+		if a.configErr != nil && !os.IsNotExist(a.configErr) {
+			a.window.SetConfigError(a.configErr)
+		}
+		a.window.ConnectCloseRequest(a.onCloseRequest)
+	}
+
+	a.window.Present()
+	if a.config.IsConnected {
+		client.Instance().Connect(a.config.Host, int(a.config.Port), a.config.Password)
+	}
+}
+
+func (a *Application) onCloseRequest() bool {
+	a.window.UpdateConfig(&a.config)
+	a.config.IsConnected = client.Instance().IsConnected()
+
+	a.saveConfig()
+
+	return false
+}
+
+func (a *Application) saveConfig() {
+	err := writeConfig(&a.config)
+	if err != nil {
+		log.Println("failed to save configuration file:", err)
+	}
+}
+
+func (a *Application) onShutdown() {
+	if client.Instance().IsConnected() {
+		client.Instance().Disconnect()
+	}
+}

internal/gui/config.go

@@ -0,0 +1,78 @@
+package gui
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+)
+
+type Configuration struct {
+	Host        string `json:"host"`
+	Port        uint64 `json:"port"`
+	Password    string `json:"password"`
+	IsConnected bool   `json:"connected"`
+	Panel       string `json:"panel"`
+	SortField   string `json:"sortField"`
+	SortDesc    bool   `json:"sortDesc"`
+	ItemSize    int    `json:"itemSize"`
+}
+
+func readConfig(config *Configuration) error {
+	filename, filenameErr := getConfigFile()
+	if filenameErr != nil {
+		return filenameErr
+	}
+
+	file, fileErr := os.Open(filename)
+	if fileErr != nil {
+		return fileErr
+	}
+	defer file.Close()
+
+	return json.NewDecoder(file).Decode(config)
+}
+
+func writeConfig(config *Configuration) error {
+	filename, filenameErr := getConfigFile()
+	if filenameErr != nil {
+		return filenameErr
+	}
+
+	file, fileErr := os.Create(filename)
+	if fileErr != nil {
+		return fileErr
+	}
+	defer file.Close()
+
+	encoder := json.NewEncoder(file)
+	encoder.SetIndent("", "\t")
+
+	return encoder.Encode(&config)
+}
+
+func getConfigFile() (string, error) {
+	configDir, configDirErr := getConfigDir()
+	if configDirErr != nil {
+		return "", configDirErr
+	}
+
+	createErr := ensureConfigDirExists(configDir)
+	if createErr != nil {
+		return "", createErr
+	}
+
+	return filepath.Join(configDir, "config.json"), nil
+}
+
+func ensureConfigDirExists(folder string) error {
+	return os.MkdirAll(folder, 0o750)
+}
+
+func getConfigDir() (string, error) {
+	configDir, configDirErr := os.UserConfigDir()
+	if configDirErr != nil {
+		return "", configDirErr
+	}
+
+	return filepath.Join(configDir, "mcg"), nil
+}

internal/gui/connectionpanel.go

@@ -0,0 +1,58 @@
+package gui
+
+import (
+	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+)
+
+type connectionPanel struct {
+	*adw.Bin
+
+	hostEntry     *adw.EntryRow
+	portSpinner   *gtk.SpinButton
+	passwordEntry *adw.PasswordEntryRow
+}
+
+func newConnectionPanel(config Configuration) *connectionPanel {
+	panel := connectionPanel{}
+	panel.loadWidgets()
+	panel.loadDefaultValues(config)
+	panel.connectSignals()
+
+	return &panel
+}
+
+func (p *connectionPanel) loadWidgets() {
+	builder := gtk.NewBuilderFromString(data.ConnectionPanelXML)
+
+	p.Bin = builder.GetObject("McgConnectionPanel").Cast().(*adw.Bin)
+	p.hostEntry = builder.GetObject("host_row").Cast().(*adw.EntryRow)
+	p.portSpinner = builder.GetObject("port_spinner").Cast().(*gtk.SpinButton)
+	p.passwordEntry = builder.GetObject("password_row").Cast().(*adw.PasswordEntryRow)
+}
+
+func (p *connectionPanel) connectSignals() {
+	p.hostEntry.ConnectApply(p.callback)
+	p.portSpinner.ConnectValueChanged(p.callback)
+	p.passwordEntry.ConnectApply(p.callback)
+}
+
+func (p *connectionPanel) loadDefaultValues(config Configuration) {
+	p.hostEntry.SetText(config.Host)
+	p.portSpinner.SetValue(float64(config.Port))
+	p.passwordEntry.SetText(config.Password)
+}
+
+func (p *connectionPanel) UpdateConfig(config *Configuration) {
+	config.Host = p.hostEntry.Text()
+	config.Port = uint64(p.portSpinner.Value())
+	config.Password = p.passwordEntry.Text()
+}
+
+func (p *connectionPanel) callback() {
+}
+
+func (p *connectionPanel) ConnectionDetails() (string, int, string) {
+	return p.hostEntry.Text(), p.portSpinner.ValueAsInt(), p.passwordEntry.Text()
+}

internal/gui/coverloader.go

@@ -0,0 +1,188 @@
+package gui
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+	"sync"
+
+	"github.com/diamondburned/gotk4/pkg/core/gerror"
+	"github.com/diamondburned/gotk4/pkg/gdkpixbuf/v2"
+	"github.com/diamondburned/gotk4/pkg/glib/v2"
+	"suruatoel.xyz/mcg/internal/client"
+	"suruatoel.xyz/mcg/internal/common"
+)
+
+type CoverLoader struct {
+	hostDir string
+	size    int
+	mutex   sync.Mutex
+}
+
+func NewCoverLoader(host string) *CoverLoader {
+	loader := CoverLoader{}
+	loader.hostDir = loader.getHostDir(host)
+	loader.size = loader.readCacheSize()
+
+	return &loader
+}
+
+func (l *CoverLoader) SetSize(size int) {
+	if l.size != size {
+		log.Println("cache size has changed from", l.size, "to", size)
+		l.clearCache()
+		l.writeCacheSize(size)
+		l.size = size
+	}
+}
+
+func (l *CoverLoader) LoadThumbnail(album *common.Album) *gdkpixbuf.Pixbuf {
+	// Load cover from cache
+	pixbuf := l.getCached(album)
+	if pixbuf != nil {
+		return pixbuf
+	}
+
+	// Load cover from server
+	albumart := client.Instance().LoadAlbumartNow(album)
+	if albumart != nil {
+		pixbuf = l.loadImage(albumart)
+	}
+	if pixbuf != nil {
+		pixbuf = pixbuf.ScaleSimple(l.size, l.size, gdkpixbuf.InterpHyper)
+		if pixbuf != nil {
+			l.setCached(album, pixbuf)
+		}
+	}
+
+	return pixbuf
+}
+
+func (l *CoverLoader) getHostDir(host string) string {
+	cacheDir, cacheDirErr := os.UserCacheDir()
+	if cacheDirErr != nil {
+		log.Println("failed to detect user cache directory:", cacheDirErr)
+		return ""
+	}
+
+	hostDir := filepath.Join(cacheDir, "mcg", host)
+
+	return hostDir
+}
+
+func (l *CoverLoader) ensureHostDir() {
+	hostDirErr := os.MkdirAll(l.hostDir, 0o750)
+	if hostDirErr != nil {
+		log.Println("failed to create cache folder for host", l.hostDir, ":", hostDirErr)
+	}
+}
+
+func (l *CoverLoader) readCacheSize() int {
+	sizeFile := l.getCacheSizeFile()
+	if sizeFile == "" {
+		return 100
+	}
+
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+
+	content, readErr := os.ReadFile(sizeFile)
+	if readErr != nil {
+		log.Println("failed to read cache size file for host", l.hostDir, ":", readErr)
+		return 100
+	}
+
+	size, sizeErr := strconv.Atoi(string(content[:]))
+	if sizeErr != nil {
+		log.Println("invalid content of cache size file for host", l.hostDir, ":", readErr)
+	}
+
+	return size
+}
+
+func (l *CoverLoader) writeCacheSize(size int) {
+	l.ensureHostDir()
+	sizeFile := l.getCacheSizeFile()
+	if sizeFile == "" {
+		return
+	}
+
+	writeErr := os.WriteFile(sizeFile, []byte(fmt.Sprintf("%d", size)), 0o644)
+	if writeErr != nil {
+		log.Println("failed to write cache size file for host", l.hostDir, ":", writeErr)
+	}
+}
+
+func (l *CoverLoader) getCacheFile(album *common.Album) string {
+	if l.hostDir == "" {
+		return ""
+	}
+
+	return filepath.Join(l.hostDir, album.ID())
+}
+
+func (l *CoverLoader) getCacheSizeFile() string {
+	if l.hostDir == "" {
+		return ""
+	}
+
+	return filepath.Join(l.hostDir, "size")
+}
+
+func (l *CoverLoader) clearCache() {
+	if l.hostDir == "" {
+		return
+	}
+
+	removeErr := os.RemoveAll(l.hostDir)
+	if removeErr != nil {
+		log.Println("failed to clear cache folder for host", l.hostDir, ":", removeErr)
+	}
+}
+
+func (l *CoverLoader) getCached(album *common.Album) *gdkpixbuf.Pixbuf {
+	cacheFile := l.getCacheFile(album)
+	if cacheFile == "" {
+		return nil
+	}
+
+	pixbuf, pixbufErr := gdkpixbuf.NewPixbufFromFile(cacheFile)
+	if pixbufErr != nil {
+		if !isFileNotFoundError(pixbufErr) {
+			log.Println("failed to read cached thumbnail for host", l.hostDir, ":", pixbufErr)
+		}
+		return nil
+	}
+
+	return pixbuf
+}
+
+func isFileNotFoundError(err error) bool {
+	if gerr, isGerror := err.(*gerror.GError); isGerror {
+		return gerr.Quark() == uint32(glib.FileErrorQuark()) && gerr.ErrorCode() == int(glib.FileErrorNoent)
+	}
+
+	return false
+}
+
+func (l *CoverLoader) setCached(album *common.Album, pixbuf *gdkpixbuf.Pixbuf) {
+	cacheFile := l.getCacheFile(album)
+	if cacheFile == "" {
+		return
+	}
+
+	l.ensureHostDir()
+	pixbuf.Savev(cacheFile, "jpeg", []string{}, []string{})
+}
+
+func (l *CoverLoader) loadImage(file []byte) *gdkpixbuf.Pixbuf {
+	pixbufLoader, loaderErr := loadPixbuf(file)
+	if loaderErr != nil {
+		log.Println("failed to load image:", loaderErr)
+		return nil
+	}
+
+	return pixbufLoader.Pixbuf()
+}

internal/gui/coverpanel.go

@@ -0,0 +1,343 @@
+package gui
+
+import (
+	"fmt"
+	"log"
+	"math"
+	"strings"
+
+	"github.com/diamondburned/gotk4/pkg/gdk/v4"
+	"github.com/diamondburned/gotk4/pkg/gdkpixbuf/v2"
+	"github.com/diamondburned/gotk4/pkg/glib/v2"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+	"suruatoel.xyz/mcg/internal/client"
+	"suruatoel.xyz/mcg/internal/common"
+	"suruatoel.xyz/mcg/internal/i18n"
+)
+
+type coverPanel struct {
+	*gtk.Overlay
+	toolbar          *gtk.Box
+	fullscreenButton *gtk.Button
+	coverInfoScroll  *gtk.ScrolledWindow
+	coverStack       *gtk.Stack
+	coverSpinner     *gtk.Spinner
+	coverScroll      *gtk.ScrolledWindow
+	coverBox         *gtk.Viewport
+	coverDefault     *gtk.Image
+	coverImage       *gtk.Image
+	infoRevealer     *gtk.Revealer
+	albumTitleLabel  *gtk.Label
+	albumDateLabel   *gtk.Label
+	albumArtistLabel *gtk.Label
+	songsScale       *gtk.Scale
+	currentAlbum     *common.PlaylistAlbum
+
+	currentPixbuf *gdkpixbuf.Pixbuf
+	currentWidth  int
+	currentHeight int
+
+	timer              *glib.SourceHandle
+	coverBoxController *gtk.GestureClick
+	isFullscreenActive bool
+}
+
+func newCoverPanel() *coverPanel {
+	panel := coverPanel{}
+	panel.loadWidgets()
+	panel.connectSignals()
+
+	return &panel
+}
+
+func (p *coverPanel) loadWidgets() {
+	builder := gtk.NewBuilderFromString(data.CoverPanelXML)
+
+	p.toolbar = builder.GetObject("toolbar").Cast().(*gtk.Box)
+	p.fullscreenButton = builder.GetObject("fullscreen_button").Cast().(*gtk.Button)
+	p.Overlay = builder.GetObject("McgCoverPanel").Cast().(*gtk.Overlay)
+	p.coverInfoScroll = builder.GetObject("cover_info_scroll").Cast().(*gtk.ScrolledWindow)
+	p.infoRevealer = builder.GetObject("info_revealer").Cast().(*gtk.Revealer)
+	p.albumTitleLabel = builder.GetObject("album_title_label").Cast().(*gtk.Label)
+	p.albumDateLabel = builder.GetObject("album_date_label").Cast().(*gtk.Label)
+	p.albumArtistLabel = builder.GetObject("album_artist_label").Cast().(*gtk.Label)
+	p.songsScale = builder.GetObject("songs_scale").Cast().(*gtk.Scale)
+	p.coverStack = builder.GetObject("cover_stack").Cast().(*gtk.Stack)
+	p.coverSpinner = builder.GetObject("cover_spinner").Cast().(*gtk.Spinner)
+	p.coverScroll = builder.GetObject("cover_scroll").Cast().(*gtk.ScrolledWindow)
+	p.coverBox = builder.GetObject("cover_box").Cast().(*gtk.Viewport)
+	p.coverDefault = builder.GetObject("cover_default").Cast().(*gtk.Image)
+	p.coverImage = builder.GetObject("cover_image").Cast().(*gtk.Image)
+}
+
+func (p *coverPanel) connectSignals() {
+	p.coverBoxController = gtk.NewGestureClick()
+	p.coverBox.AddController(p.coverBoxController)
+
+	buttonController := gtk.NewGestureClick()
+	buttonController.ConnectPressed(p.OnSongsScalePressed)
+	buttonController.ConnectUnpairedRelease(p.OnSongsScaleUnpairedReleased)
+	p.songsScale.AddController(buttonController)
+}
+
+func (p *coverPanel) ConnectFullscreen(callback func()) {
+	p.fullscreenButton.ConnectClicked(callback)
+	p.coverBoxController.ConnectPressed(func(nPress int, x float64, y float64) {
+		if nPress == 2 && p.currentAlbum != nil {
+			callback()
+		}
+	})
+}
+
+func (p *coverPanel) OnSongsScalePressed(nPress int, x float64, y float64) {
+	p.clearTimer()
+}
+
+func (p *coverPanel) OnSongsScaleUnpairedReleased(x float64, y float64, button uint, sequence *gdk.EventSequence) {
+	value := uint64(p.songsScale.Value())
+	time := p.currentAlbum.Length()
+	songs := p.currentAlbum.Songs()
+
+	pos := 0
+	for index := len(songs) - 1; index >= 0; index-- {
+		time = time - songs[index].Length()
+		pos = int(songs[index].Pos())
+		if time < value {
+			break
+		}
+	}
+	time = max(value-time-1, 0)
+	client.Instance().Seek(pos, time)
+}
+
+func (p *coverPanel) Toolbar() gtk.Widgetter {
+	return p.toolbar
+}
+
+func (p *coverPanel) SetPlay(pos uint64, time uint64) {
+	p.clearTimer()
+	defer p.startTimer()
+
+	dsongs := p.currentAlbum.Songs()
+	for index := range pos {
+		time += uint64(dsongs[index].Length())
+	}
+	p.songsScale.SetValue(float64(time + 1))
+}
+
+func (p *coverPanel) SetPause() {
+	p.clearTimer()
+}
+
+func (p *coverPanel) clearTimer() {
+	if p.timer != nil {
+		glib.SourceRemove(*p.timer)
+		p.timer = nil
+	}
+}
+
+func (p *coverPanel) startTimer() {
+	newTimer := glib.TimeoutAdd(1000, p.playing)
+	p.timer = &newTimer
+}
+
+func (p *coverPanel) playing() bool {
+	p.songsScale.SetValue(p.songsScale.Value() + 1)
+
+	return true
+}
+
+func (p *coverPanel) SetAlbum(state string, album *common.PlaylistAlbum) {
+	if album != nil {
+		// Set labels
+		p.albumTitleLabel.SetLabel(album.Title())
+		p.albumDateLabel.SetLabel(strings.Join(album.Dates(), ", "))
+		p.albumArtistLabel.SetLabel(strings.Join(album.Artists(), ","))
+		p.infoRevealer.SetRevealChild(true)
+
+		p.setSongs(album)
+	} else {
+		p.infoRevealer.SetRevealChild(false)
+	}
+
+	// Load cover
+	if album != nil {
+		p.coverSpinner.Start()
+		p.coverStack.SetVisibleChild(p.coverSpinner)
+
+		client.Instance().LoadAlbumart(album.Album)
+	}
+
+	// Set current album
+	p.currentAlbum = album
+	p.fullscreenButton.SetSensitive(album != nil)
+	p.enableSonglist()
+}
+
+func (p *coverPanel) Fullscreen(active bool) {
+	p.isFullscreenActive = active
+	p.enableSonglist()
+	glib.IdleAdd(p.resizeImage)
+}
+
+func (p *coverPanel) enableSonglist() {
+	enable := p.currentAlbum != nil && !p.isFullscreenActive
+
+	p.infoRevealer.SetRevealChild(enable)
+}
+
+func (p *coverPanel) SetAlbumart(album *common.Album, albumart []byte) {
+	if p.currentAlbum == nil || album != p.currentAlbum.Album {
+		return
+	}
+
+	defer glib.IdleAdd(func() {
+		p.coverStack.SetVisibleChild(p.coverScroll)
+		p.coverSpinner.Stop()
+	})
+
+	p.currentPixbuf = nil
+	if albumart == nil || len(albumart) == 0 {
+		return
+	}
+
+	loader, loaderErr := loadPixbuf(albumart)
+	if loaderErr != nil {
+		log.Println("failed to load albumart for ", album.Title(), ":", loaderErr)
+		return
+	}
+
+	p.currentPixbuf = loader.Pixbuf()
+	glib.IdleAdd(p.showImage)
+}
+
+func (p *coverPanel) showImage() {
+	if p.currentPixbuf != nil {
+		p.resizeImage()
+		p.coverStack.SetVisibleChild(p.coverScroll)
+	} else {
+		p.coverStack.SetVisibleChild(p.coverDefault)
+	}
+}
+
+func loadPixbuf(data []byte) (*gdkpixbuf.PixbufLoader, error) {
+	loader := gdkpixbuf.NewPixbufLoader()
+	defer loader.Close()
+
+	return loader, loader.Write(data)
+}
+
+func (p *coverPanel) setSongs(album *common.PlaylistAlbum) {
+	p.songsScale.ClearMarks()
+	p.songsScale.SetRange(0, float64(album.Length()))
+
+	length := uint64(0)
+	for _, song := range album.Songs() {
+		curLength := length
+		if length > 0 && length < album.Length() {
+			curLength += 1
+		}
+		songTitle := createSongTitle(song)
+		p.songsScale.AddMark(
+			float64(curLength),
+			gtk.PosRight,
+			glib.MarkupEscapeText(songTitle),
+		)
+		length += song.Length()
+	}
+
+	p.songsScale.AddMark(float64(length), gtk.PosRight, createAlbumLengthTitle(length))
+	p.alignSongsScaleMarks()
+}
+
+func (p *coverPanel) alignSongsScaleMarks() {
+	p.alignScaleMarks(&p.songsScale.Widget)
+}
+
+func (p *coverPanel) alignScaleMarks(widgetter gtk.Widgetter) {
+	widget := widgetter.(*gtk.Widget)
+	child := widget.FirstChild()
+	for child != nil {
+		if label, isLabel := child.(*gtk.Label); isLabel {
+			label.SetHAlign(gtk.AlignStart)
+			child = label.NextSibling()
+		} else {
+			p.alignScaleMarks(child)
+			child = child.(*gtk.Widget).NextSibling()
+		}
+	}
+}
+
+func createSongTitle(song *common.PlaylistSong) string {
+	songArtists := song.SongArtists()
+	if len(songArtists) > 0 {
+		return fmt.Sprintf(
+			i18n.T("%s feat. %s"),
+			song.Title(),
+			strings.Join(songArtists, ", "),
+		)
+	}
+
+	return song.Title()
+}
+
+func createAlbumLengthTitle(length uint64) string {
+	minutes := length / 60
+	seconds := length % 60
+
+	return fmt.Sprintf(i18n.T("%d:%d minutes"), minutes, seconds)
+}
+
+func (p *coverPanel) SetWidth(width int) {
+	glib.IdleAdd(p.resizeImage)
+	glib.IdleAdd(func() {
+		p.coverInfoScroll.SetMaxContentWidth(width / 2)
+	})
+}
+
+func (p *coverPanel) resizeImage() {
+	newWidth, newHeight := p.getSize()
+	if p.hasSizeChanged(newWidth, newHeight) {
+		return
+	}
+	p.setSize(newWidth, newHeight)
+
+	if p.currentPixbuf == nil {
+		p.coverImage.SetPixelSize(min(newWidth, newHeight))
+		return
+	}
+
+	width, height := p.calculateCoverSize()
+	if width <= 0 || height <= 0 {
+		return
+	}
+
+	scaledPixbuf := p.currentPixbuf.ScaleSimple(width, height, gdkpixbuf.InterpHyper)
+	p.coverImage.SetFromPaintable(gdk.NewTextureForPixbuf(scaledPixbuf))
+	p.coverImage.SetPixelSize(min(width, height))
+}
+
+func (p *coverPanel) getSize() (int, int) {
+	return p.coverStack.Size(gtk.OrientationHorizontal), p.coverStack.Size(gtk.OrientationVertical)
+}
+
+func (p *coverPanel) hasSizeChanged(newWidth, newHeight int) bool {
+	return newWidth == p.currentWidth && newHeight == p.currentHeight
+}
+
+func (p *coverPanel) setSize(newWidth, newHeight int) {
+	p.currentWidth = newWidth
+	p.currentHeight = newHeight
+}
+
+func (p *coverPanel) calculateCoverSize() (width, height int) {
+	ratioWidth := float64(p.currentWidth) / float64(p.currentPixbuf.Width())
+	ratioHeight := float64(p.currentHeight) / float64(p.currentPixbuf.Height())
+	ratio := min(min(ratioWidth, ratioHeight), 1)
+
+	width = int(math.Floor(float64(p.currentPixbuf.Width()) * ratio))
+	height = int(math.Floor(float64(p.currentPixbuf.Height()) * ratio))
+
+	return
+}

internal/gui/librarypanel.go

@@ -0,0 +1,563 @@
+package gui
+
+import (
+	"log"
+	"math"
+	"slices"
+	"strings"
+	"sync"
+
+	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
+	"github.com/diamondburned/gotk4/pkg/gdk/v4"
+	"github.com/diamondburned/gotk4/pkg/gdkpixbuf/v2"
+	"github.com/diamondburned/gotk4/pkg/glib/v2"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+	"suruatoel.xyz/mcg/internal/client"
+	"suruatoel.xyz/mcg/internal/common"
+)
+
+type libraryPanel struct {
+	*adw.Bin
+	toolbar           *gtk.Box
+	selectButton      *gtk.ToggleButton
+	actionbarRevealer *gtk.Revealer
+	toolbarPopover    *gtk.Popover
+	searchBar         *gtk.SearchBar
+	searchEntry       *gtk.SearchEntry
+	sortButtons       map[string]*gtk.CheckButton
+	sortDescButton    *gtk.CheckButton
+	gridScale         *gtk.Scale
+	stack             *gtk.Stack
+	progressBox       *gtk.Box
+	progressBar       *gtk.ProgressBar
+	scroll            *gtk.ScrolledWindow
+	libraryGrid       *gtk.GridView
+	gridFactory       *pictureItemFactory[string]
+	libraryModel      *gtk.StringList
+	selectionMulti    *gtk.MultiSelection
+	selectionSingle   *gtk.SingleSelection
+
+	headerbarStandalone   *albumHeaderbar
+	libraryStack          *gtk.Stack
+	panelNormal           *gtk.Box
+	panelStandalone       *gtk.Box
+	standaloneStack       *gtk.Stack
+	standaloneSpinner     *gtk.Spinner
+	standaloneScroll      *gtk.ScrolledWindow
+	standaloneImage       *gtk.Image
+	standalonePlayButton  *gtk.Button
+	standaloneQueueButton *gtk.Button
+	selectionQueueButton  *gtk.Button
+	selectionCancelButton *gtk.Button
+
+	coverLoader      *CoverLoader
+	albums           map[string]*common.Album
+	pixbufs          map[string]*gdkpixbuf.Pixbuf
+	sortField        string
+	sortDesc         bool
+	itemSize         int
+	itemSizeCallback ItemSizeCallback
+
+	libraryLock sync.Mutex
+	libraryWait sync.WaitGroup
+
+	standaloneAlbum    *common.Album
+	standalonePixbuf   *gdkpixbuf.Pixbuf
+	standaloneCallback func(bool)
+}
+
+type ItemSizeCallback func(itemSize int)
+
+func newLibraryPanel(config Configuration) *libraryPanel {
+	panel := libraryPanel{
+		albums:      make(map[string]*common.Album),
+		pixbufs:     make(map[string]*gdkpixbuf.Pixbuf),
+		sortField:   "year",
+		sortDesc:    false,
+		libraryLock: sync.Mutex{},
+		libraryWait: sync.WaitGroup{},
+	}
+	panel.loadWidgets(config)
+	panel.loadDefaultValues(config)
+	panel.connectSignals()
+
+	return &panel
+}
+
+func (p *libraryPanel) loadWidgets(config Configuration) {
+	builder := gtk.NewBuilderFromString(data.LibraryPanelXML)
+
+	p.toolbar = builder.GetObject("toolbar").Cast().(*gtk.Box)
+	p.selectButton = builder.GetObject("select_button").Cast().(*gtk.ToggleButton)
+	p.actionbarRevealer = builder.GetObject("actionbar_revealer").Cast().(*gtk.Revealer)
+	p.toolbarPopover = builder.GetObject("toolbar_popover").Cast().(*gtk.Popover)
+
+	p.searchBar = builder.GetObject("filter_bar").Cast().(*gtk.SearchBar)
+	p.searchEntry = builder.GetObject("filter_entry").Cast().(*gtk.SearchEntry)
+	p.sortButtons = make(map[string]*gtk.CheckButton)
+	p.sortButtons["artist"] = builder.GetObject("sort_artist").Cast().(*gtk.CheckButton)
+	p.sortButtons["title"] = builder.GetObject("sort_title").Cast().(*gtk.CheckButton)
+	p.sortButtons["year"] = builder.GetObject("sort_year").Cast().(*gtk.CheckButton)
+	p.sortButtons["modified"] = builder.GetObject("sort_modified").Cast().(*gtk.CheckButton)
+	p.sortDescButton = builder.GetObject("toolbar_sort_order_button").Cast().(*gtk.CheckButton)
+	p.gridScale = builder.GetObject("grid_scale").Cast().(*gtk.Scale)
+
+	p.Bin = builder.GetObject("McgLibraryPanel").Cast().(*adw.Bin)
+	p.stack = builder.GetObject("stack").Cast().(*gtk.Stack)
+	p.progressBox = builder.GetObject("progress_box").Cast().(*gtk.Box)
+	p.progressBar = builder.GetObject("progress_bar").Cast().(*gtk.ProgressBar)
+	p.scroll = builder.GetObject("scroll").Cast().(*gtk.ScrolledWindow)
+	p.libraryGrid = builder.GetObject("library_grid").Cast().(*gtk.GridView)
+	p.libraryModel = gtk.NewStringList(nil)
+	p.selectionMulti = gtk.NewMultiSelection(p.libraryModel)
+	p.selectionSingle = gtk.NewSingleSelection(p.libraryModel)
+	p.libraryGrid.SetModel(p.selectionSingle)
+
+	p.gridFactory = newPictureItemFactory[string](p.itemToModelID, p.modelIDToValue)
+	p.libraryGrid.SetFactory(p.gridFactory.ListItemFactory())
+
+	// Headerbar
+	p.headerbarStandalone = newAlbumHeaderbar()
+	p.libraryStack = builder.GetObject("library_stack").Cast().(*gtk.Stack)
+	p.panelNormal = builder.GetObject("panel_normal").Cast().(*gtk.Box)
+	p.panelStandalone = builder.GetObject("panel_standalone").Cast().(*gtk.Box)
+
+	p.standaloneStack = builder.GetObject("standalone_stack").Cast().(*gtk.Stack)
+	p.standaloneSpinner = builder.GetObject("standalone_spinner").Cast().(*gtk.Spinner)
+	p.standaloneScroll = builder.GetObject("standalone_scroll").Cast().(*gtk.ScrolledWindow)
+	p.standaloneImage = builder.GetObject("standalone_image").Cast().(*gtk.Image)
+	p.standalonePlayButton = builder.GetObject("standalone_play_button").Cast().(*gtk.Button)
+	p.standaloneQueueButton = builder.GetObject("standalone_queue_button").Cast().(*gtk.Button)
+
+	// Selection
+	p.selectionQueueButton = builder.GetObject("selection_queue_button").Cast().(*gtk.Button)
+	p.selectionCancelButton = builder.GetObject("selection_cancel_button").Cast().(*gtk.Button)
+}
+
+func (p *libraryPanel) itemToModelID(item *glib.Object) string {
+	return item.Cast().(*gtk.StringObject).String()
+}
+
+func (p *libraryPanel) modelIDToValue(itemID string) (tooltip string, pixbuf *gdkpixbuf.Pixbuf) {
+	if album, ok := p.albums[itemID]; ok {
+		tooltip = album.Tooltip()
+	}
+	pixbuf = p.pixbufs[itemID]
+
+	return
+}
+
+func (p *libraryPanel) loadDefaultValues(config Configuration) {
+	p.itemSize = config.ItemSize
+	p.gridScale.SetValue(float64(config.ItemSize))
+
+	_, found := p.sortButtons[config.SortField]
+	if found {
+		p.sortField = config.SortField
+	}
+	p.sortDesc = config.SortDesc
+
+	p.sortButtons[p.sortField].SetActive(true)
+	p.sortDescButton.SetActive(p.sortDesc)
+}
+
+func (p *libraryPanel) connectSignals() {
+	p.selectButton.ConnectToggled(p.onSelectToggled)
+	p.searchEntry.ConnectSearchChanged(p.onFilterEntryChanged)
+	for field, button := range p.sortButtons {
+		button.ConnectToggled(func() {
+			p.onSortToggled(field, button)
+		})
+	}
+	p.sortDescButton.ConnectToggled(p.onSortDescToggled)
+
+	p.libraryGrid.ConnectActivate(p.onGridClicked)
+
+	p.headerbarStandalone.ConnectClose(p.onHeaderbarStandaloneClose)
+	p.standalonePlayButton.ConnectClicked(p.onStandalonePlayClicked)
+	p.standaloneQueueButton.ConnectClicked(p.onStandaloneQueueClicked)
+
+	p.selectionQueueButton.ConnectClicked(p.onSelectionQueue)
+	p.selectionCancelButton.ConnectClicked(p.onSelectionCancel)
+
+	buttonController := gtk.NewGestureClick()
+	buttonController.ConnectUnpairedRelease(p.onGridScaleReleased)
+	p.gridScale.AddController(buttonController)
+	p.gridScale.ConnectValueChanged(p.onGridScaleChanged)
+}
+
+func (p *libraryPanel) ConnectItemSizeChanged(callback ItemSizeCallback) {
+	p.itemSizeCallback = callback
+}
+
+func (p *libraryPanel) ConnectStandalone(callback func(bool)) {
+	p.standaloneCallback = callback
+}
+
+func (p *libraryPanel) onSelectToggled() {
+	if p.selectButton.Active() {
+		p.actionbarRevealer.SetRevealChild(true)
+		p.libraryGrid.SetModel(p.selectionMulti)
+		p.libraryGrid.SetSingleClickActivate(false)
+		p.libraryGrid.StyleContext().AddClass("selection")
+	} else {
+		p.actionbarRevealer.SetRevealChild(false)
+		p.libraryGrid.SetModel(p.selectionSingle)
+		p.libraryGrid.SetSingleClickActivate(true)
+		p.libraryGrid.StyleContext().RemoveClass("selection")
+	}
+}
+
+func (p *libraryPanel) onFilterEntryChanged() {
+	p.updateGridModel()
+}
+
+func (p *libraryPanel) onSortToggled(field string, button *gtk.CheckButton) {
+	if !button.Active() {
+		return
+	}
+
+	p.sortField = field
+	p.updateGridModel()
+}
+
+func (p *libraryPanel) onSortDescToggled() {
+	p.sortDesc = p.sortDescButton.Active()
+	p.updateGridModel()
+}
+
+func (p *libraryPanel) onGridScaleChanged() {
+	size := math.Floor(p.gridScale.Value())
+	gridRange := p.gridScale.Adjustment()
+	if size < gridRange.Lower() || size > gridRange.Upper() {
+		return
+	}
+
+	go p.setGridSize(int(size))
+}
+
+func (p *libraryPanel) setGridSize(size int) {
+	if size == p.itemSize {
+		return
+	}
+
+	for i := range p.libraryGrid.Model().NItems() {
+		itemObj := p.libraryGrid.Model().Item(i)
+		if itemObj != nil {
+			itemStr := itemObj.Cast().(*gtk.StringObject)
+			albumID := itemStr.String()
+			picture, pictureFound := p.gridFactory.Picture(albumID)
+			if pictureFound {
+				pixbuf, pixbufFound := p.pixbufs[albumID]
+				if pixbufFound {
+					if pixbuf != nil {
+						pixbuf = pixbuf.ScaleSimple(size, size, gdkpixbuf.InterpNearest)
+					} else {
+					}
+					glib.IdleAdd(func() {
+						picture.SetPaintable(gdk.NewTextureForPixbuf(pixbuf))
+					})
+				}
+			}
+		}
+	}
+}
+
+func (p *libraryPanel) onGridScaleReleased(x float64, y float64, button uint, sequence *gdk.EventSequence) {
+	size := math.Floor(p.gridScale.Value())
+	gridRange := p.gridScale.Adjustment()
+	if size < gridRange.Lower() || size > gridRange.Upper() {
+		return
+	}
+
+	p.itemSize = int(size)
+	p.redraw()
+	glib.IdleAdd(p.toolbarPopover.Popdown)
+	if p.itemSizeCallback != nil {
+		p.itemSizeCallback(p.itemSize)
+	}
+}
+
+func (p *libraryPanel) redraw() {
+	if len(p.albums) > 0 {
+		p.SetAlbums(p.albums)
+	}
+}
+
+func (p *libraryPanel) onGridClicked(position uint) {
+	// Get selected album
+	itemObj := p.libraryModel.Item(position)
+	if itemObj == nil {
+		return
+	}
+	strObj := itemObj.Cast().(*gtk.StringObject)
+	id := strObj.String()
+	album, found := p.albums[id]
+	if !found {
+		return
+	}
+
+	// Show standalone album
+	if p.libraryGrid.Model().Native() == p.selectionSingle.Native() {
+		p.standaloneAlbum = album
+		p.headerbarStandalone.SetAlbum(album)
+		p.standaloneStack.SetVisibleChild(p.standaloneSpinner)
+		p.standaloneSpinner.Start()
+		p.openStandalone()
+		client.Instance().LoadAlbumart(album)
+	}
+}
+
+func (p *libraryPanel) onHeaderbarStandaloneClose() {
+	p.closeStandalone()
+}
+
+func (p *libraryPanel) openStandalone() {
+	p.libraryStack.SetVisibleChild(p.panelStandalone)
+	if p.standaloneCallback != nil {
+		p.standaloneCallback(true)
+	}
+}
+
+func (p *libraryPanel) closeStandalone() {
+	p.libraryStack.SetVisibleChild(p.panelNormal)
+	if p.standaloneCallback != nil {
+		p.standaloneCallback(false)
+	}
+}
+
+func (p *libraryPanel) setCoverLoader(loader *CoverLoader) {
+	p.coverLoader = loader
+}
+
+func (p *libraryPanel) SetAlbumart(album *common.Album, albumart []byte) {
+	if album != p.standaloneAlbum {
+		return
+	}
+
+	p.standalonePixbuf = nil
+	if albumart == nil || len(albumart) == 0 {
+		return
+	}
+
+	loader, loaderErr := loadPixbuf(albumart)
+	if loaderErr != nil {
+		log.Println("failed to load albumart for ", album.Title(), ":", loaderErr)
+		return
+	}
+
+	p.standalonePixbuf = loader.Pixbuf()
+	glib.IdleAdd(p.showStandaloneImage)
+}
+
+func (p *libraryPanel) showStandaloneImage() {
+	p.resizeStandaloneImage()
+	p.standaloneStack.SetVisibleChild(p.standaloneScroll)
+	p.standaloneSpinner.Stop()
+}
+
+func (p *libraryPanel) resizeStandaloneImage() {
+	newWidth, newHeight := p.getStandaloneSize()
+	if p.standalonePixbuf == nil {
+		p.standaloneImage.SetPixelSize(min(newWidth, newHeight))
+		return
+	}
+
+	width, height := p.calculateCoverSize(newWidth, newHeight)
+	if width <= 0 || height <= 0 {
+		return
+	}
+
+	scaledPixbuf := p.standalonePixbuf.ScaleSimple(width, height, gdkpixbuf.InterpHyper)
+	p.standaloneImage.SetFromPaintable(gdk.NewTextureForPixbuf(scaledPixbuf))
+	p.standaloneImage.SetPixelSize(min(width, height))
+}
+
+func (p *libraryPanel) getStandaloneSize() (int, int) {
+	return p.standaloneStack.Size(gtk.OrientationHorizontal), p.standaloneStack.Size(gtk.OrientationVertical)
+}
+
+func (p *libraryPanel) calculateCoverSize(currentWidth, currentHeight int) (width, height int) {
+	ratioWidth := float64(currentWidth) / float64(p.standalonePixbuf.Width())
+	ratioHeight := float64(currentHeight) / float64(p.standalonePixbuf.Height())
+	ratio := min(min(ratioWidth, ratioHeight), 1)
+
+	width = int(math.Floor(float64(p.standalonePixbuf.Width()) * ratio))
+	height = int(math.Floor(float64(p.standalonePixbuf.Height()) * ratio))
+
+	return
+}
+
+func (p *libraryPanel) onStandalonePlayClicked() {
+	client.Instance().PlayAlbum(p.standaloneAlbum)
+	p.closeStandalone()
+}
+
+func (p *libraryPanel) onStandaloneQueueClicked() {
+	client.Instance().QueueAlbum(p.standaloneAlbum)
+	p.closeStandalone()
+}
+
+func (p *libraryPanel) onSelectionQueue() {
+	albums := p.getSelectedAlbums()
+	if len(albums) > 0 {
+		client.Instance().QueueAlbums(albums)
+	}
+
+	p.selectButton.SetActive(false)
+}
+
+func (p *libraryPanel) onSelectionCancel() {
+	p.selectButton.SetActive(false)
+}
+
+func (p *libraryPanel) getSelectedAlbums() []*common.Album {
+	albums := []*common.Album{}
+	for i := range p.selectionMulti.NItems() {
+		if p.selectionMulti.IsSelected(i) {
+			itemObj := p.selectionMulti.Item(i)
+			if itemObj != nil {
+				itemStr := itemObj.Cast().(*gtk.StringObject)
+				albumID := itemStr.String()
+				album, found := p.albums[albumID]
+				if found {
+					albums = append(albums, album)
+				}
+			}
+		}
+	}
+
+	return albums
+}
+
+func (p *libraryPanel) UpdateConfig(config *Configuration) {
+	config.SortField = p.sortField
+	config.SortDesc = p.sortDesc
+	config.ItemSize = p.itemSize
+}
+
+func (p *libraryPanel) updateGridModel() {
+	albums := p.filterAlbums()
+	p.sortAlbums(albums)
+	p.updateGrid(albums)
+}
+
+func (p *libraryPanel) filterAlbums() []*common.Album {
+	var matchingAlbums []*common.Album
+	query := strings.TrimSpace(strings.ToLower(p.searchEntry.Text()))
+	for _, album := range p.albums {
+		if album.IsMatch(query) {
+			matchingAlbums = append(matchingAlbums, album)
+		}
+	}
+
+	return matchingAlbums
+}
+
+func (p *libraryPanel) sortAlbums(filtered []*common.Album) {
+	common.SortAlbums(filtered, p.sortField)
+
+	if p.sortDesc {
+		slices.Reverse(filtered)
+	}
+}
+
+func (p *libraryPanel) updateGrid(albums []*common.Album) {
+	glib.IdleAdd(func() {
+		n := p.libraryModel.NItems()
+		if n > 0 {
+			p.libraryModel.Splice(0, n, nil)
+		}
+
+		ids := make([]string, 0, len(albums))
+		for _, item := range albums {
+			ids = append(ids, item.ID())
+		}
+
+		if len(ids) > 0 {
+			p.libraryModel.Splice(0, 0, ids)
+		}
+	})
+}
+
+func (p *libraryPanel) Toolbar() gtk.Widgetter {
+	return p.toolbar
+}
+
+func (p *libraryPanel) Wait() {
+	p.libraryWait.Wait()
+}
+
+type LibraryFactory gtk.ListItemFactory
+
+func (p *libraryPanel) SetAlbums(albums map[string]*common.Album) {
+	p.libraryWait.Add(1)
+	go p.setAlbums(albums)
+}
+
+func (p *libraryPanel) setAlbums(albums map[string]*common.Album) {
+	p.libraryLock.Lock()
+	defer p.libraryLock.Unlock()
+	defer p.libraryWait.Done()
+
+	p.albums = albums
+	glib.IdleAdd(func() {
+		p.stack.SetVisibleChild(p.progressBox)
+		p.progressBar.SetFraction(0.0)
+	})
+
+	// Create loader loader
+	i := 0
+	n := len(albums)
+	p.pixbufs = make(map[string]*gdkpixbuf.Pixbuf)
+
+	for _, album := range albums {
+		if p.coverLoader != nil {
+			p.pixbufs[album.ID()] = p.coverLoader.LoadThumbnail(album)
+		}
+
+		i++
+		glib.IdleAdd(func() {
+			p.progressBar.SetFraction(float64(i) / float64(n))
+			// FIXME: i18n
+			p.progressBar.SetText("Loading images")
+		})
+	}
+
+	p.updateGridModel()
+	glib.IdleAdd(func() {
+		p.stack.SetVisibleChild(p.scroll)
+	})
+}
+
+func (p *libraryPanel) SetWidth(width int) {
+	p.resizeStandaloneImage()
+	p.setMarks(width)
+}
+
+func (p *libraryPanel) setMarks(width int) {
+	glib.IdleAdd(func() {
+		p.gridScale.ClearMarks()
+	})
+
+	lower := p.gridScale.Adjustment().Lower()
+	upper := p.gridScale.Adjustment().Upper()
+	countMin := int(math.Max(float64(width)/upper, 1))
+	countMax := int(math.Max(float64(width)/lower, 1))
+	for i := countMin; i <= countMax; i++ {
+		pixel := int(float64(width) / float64(i))
+		pixel = pixel - (2 * pixel / 100)
+		glib.IdleAdd(func() {
+			p.gridScale.AddMark(float64(pixel), gtk.PosBottom, "")
+		})
+	}
+}
+
+func (p *libraryPanel) ShowSearch() {
+	p.searchBar.SetSearchMode(true)
+}
+
+func (p *libraryPanel) HeaderbarStandalone() *albumHeaderbar {
+	return p.headerbarStandalone
+}

internal/gui/pictureitemfactory.go

@@ -0,0 +1,78 @@
+package gui
+
+import (
+	"github.com/diamondburned/gotk4/pkg/core/glib"
+	"github.com/diamondburned/gotk4/pkg/gdk/v4"
+	"github.com/diamondburned/gotk4/pkg/gdkpixbuf/v2"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+)
+
+type pictureItemFactory[T comparable] struct {
+	model           modelAccessor[T]
+	value           valueAccessor[T]
+	listItemFactory *gtk.SignalListItemFactory
+	pictures        map[T]*gtk.Picture
+}
+
+type (
+	modelAccessor[T any] func(item *glib.Object) T
+	valueAccessor[T any] func(T) (tooltip string, pixbuf *gdkpixbuf.Pixbuf)
+)
+
+func newPictureItemFactory[T comparable](model modelAccessor[T], value valueAccessor[T]) *pictureItemFactory[T] {
+	factory := pictureItemFactory[T]{
+		model:           model,
+		value:           value,
+		listItemFactory: gtk.NewSignalListItemFactory(),
+		pictures:        make(map[T]*gtk.Picture),
+	}
+	factory.listItemFactory.Connect("setup", factory.setup)
+	factory.listItemFactory.Connect("bind", factory.bind)
+	factory.listItemFactory.Connect("unbind", factory.unbind)
+
+	return &factory
+}
+
+func (f *pictureItemFactory[T]) setup(listitem *gtk.ListItem) {
+	picture := gtk.NewPicture()
+	picture.SetContentFit(gtk.ContentFitContain)
+	picture.SetCanShrink(false)
+	listitem.SetChild(picture)
+}
+
+func (f *pictureItemFactory[T]) bind(listitem *gtk.ListItem) {
+	item := listitem.Item()
+	if item == nil {
+		return
+	}
+	itemID := f.model(item)
+
+	tooltip, pixbuf := f.value(itemID)
+	picture := listitem.Child().(*gtk.Picture)
+	picture.SetTooltipText(tooltip)
+	if pixbuf != nil {
+		picture.SetPaintable(gdk.NewTextureForPixbuf(pixbuf))
+	}
+
+	f.pictures[itemID] = picture
+}
+
+func (f *pictureItemFactory[T]) unbind(listitem *gtk.ListItem) {
+	itemObj := listitem.Item()
+	if itemObj == nil {
+		return
+	}
+
+	itemID := f.model(itemObj)
+	delete(f.pictures, itemID)
+}
+
+func (f *pictureItemFactory[T]) ListItemFactory() *gtk.ListItemFactory {
+	return &f.listItemFactory.ListItemFactory
+}
+
+func (f *pictureItemFactory[T]) Picture(itemID T) (*gtk.Picture, bool) {
+	picture, found := f.pictures[itemID]
+
+	return picture, found
+}

internal/gui/playlistpanel.go

@@ -0,0 +1,358 @@
+package gui
+
+import (
+	"log"
+	"math"
+
+	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
+	"github.com/diamondburned/gotk4/pkg/gdk/v4"
+	"github.com/diamondburned/gotk4/pkg/gdkpixbuf/v2"
+	"github.com/diamondburned/gotk4/pkg/glib/v2"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+	"suruatoel.xyz/mcg/internal/client"
+	"suruatoel.xyz/mcg/internal/common"
+)
+
+type playlistPanel struct {
+	*adw.Bin
+	toolbar           *gtk.Box
+	selectButton      *gtk.ToggleButton
+	actionbarRevealer *gtk.Revealer
+	clearButton       *gtk.Button
+	playlistGrid      *gtk.GridView
+	gridFactory       *pictureItemFactory[string]
+	playlistModel     *gtk.StringList
+	selectionMulti    *gtk.MultiSelection
+	selectionSingle   *gtk.SingleSelection
+
+	headerbarStandalone    *albumHeaderbar
+	playlistStack          *gtk.Stack
+	panelNormal            *gtk.Box
+	panelStandalone        *gtk.Box
+	standaloneStack        *gtk.Stack
+	standaloneSpinner      *gtk.Spinner
+	standaloneScroll       *gtk.ScrolledWindow
+	standaloneImage        *gtk.Image
+	standalonePlayButton   *gtk.Button
+	standaloneRemoveButton *gtk.Button
+
+	selectionRemoveButton *gtk.Button
+	selectionCancelButton *gtk.Button
+
+	coverLoader *CoverLoader
+	playlist    []*common.PlaylistAlbum
+	albums      map[string]*common.PlaylistAlbum
+	pixbufs     map[string]*gdkpixbuf.Pixbuf
+
+	standaloneAlbum    *common.PlaylistAlbum
+	standalonePixbuf   *gdkpixbuf.Pixbuf
+	standaloneCallback func(bool)
+}
+
+func newPlaylistPanel() *playlistPanel {
+	panel := playlistPanel{
+		albums:  make(map[string]*common.PlaylistAlbum),
+		pixbufs: make(map[string]*gdkpixbuf.Pixbuf),
+	}
+	panel.loadWidgets()
+	panel.connectSignals()
+
+	return &panel
+}
+
+func (p *playlistPanel) loadWidgets() {
+	builder := gtk.NewBuilderFromString(data.PlaylistPanelXML)
+
+	p.toolbar = builder.GetObject("toolbar").Cast().(*gtk.Box)
+	p.selectButton = builder.GetObject("select_button").Cast().(*gtk.ToggleButton)
+	p.actionbarRevealer = builder.GetObject("actionbar_revealer").Cast().(*gtk.Revealer)
+	p.clearButton = builder.GetObject("playlist_clear_button").Cast().(*gtk.Button)
+
+	p.Bin = builder.GetObject("McgPlaylistPanel").Cast().(*adw.Bin)
+	p.playlistGrid = builder.GetObject("playlist_grid").Cast().(*gtk.GridView)
+	p.playlistModel = gtk.NewStringList(nil)
+	p.selectionMulti = gtk.NewMultiSelection(p.playlistModel)
+	p.selectionSingle = gtk.NewSingleSelection(p.playlistModel)
+	p.playlistGrid.SetModel(p.selectionSingle)
+
+	p.gridFactory = newPictureItemFactory[string](p.itemToModelID, p.modelIDToValue)
+	p.playlistGrid.SetFactory(p.gridFactory.ListItemFactory())
+
+	// Headerbar
+	p.headerbarStandalone = newAlbumHeaderbar()
+	p.playlistStack = builder.GetObject("playlist_stack").Cast().(*gtk.Stack)
+	p.panelNormal = builder.GetObject("panel_normal").Cast().(*gtk.Box)
+	p.panelStandalone = builder.GetObject("panel_standalone").Cast().(*gtk.Box)
+
+	p.standaloneStack = builder.GetObject("standalone_stack").Cast().(*gtk.Stack)
+	p.standaloneSpinner = builder.GetObject("standalone_spinner").Cast().(*gtk.Spinner)
+	p.standaloneScroll = builder.GetObject("standalone_scroll").Cast().(*gtk.ScrolledWindow)
+	p.standaloneImage = builder.GetObject("standalone_image").Cast().(*gtk.Image)
+	p.standalonePlayButton = builder.GetObject("standalone_play_button").Cast().(*gtk.Button)
+	p.standaloneRemoveButton = builder.GetObject("standalone_remove_button").Cast().(*gtk.Button)
+
+	// Selection
+	p.selectionRemoveButton = builder.GetObject("selection_remove_button").Cast().(*gtk.Button)
+	p.selectionCancelButton = builder.GetObject("selection_cancel_button").Cast().(*gtk.Button)
+}
+
+func (p *playlistPanel) itemToModelID(item *glib.Object) string {
+	return item.Cast().(*gtk.StringObject).String()
+}
+
+func (p *playlistPanel) modelIDToValue(itemID string) (tooltip string, pixbuf *gdkpixbuf.Pixbuf) {
+	if album, ok := p.albums[itemID]; ok {
+		tooltip = album.Tooltip()
+	}
+	pixbuf = p.pixbufs[itemID]
+
+	return
+}
+
+func (p *playlistPanel) connectSignals() {
+	p.selectButton.ConnectToggled(p.onSelectToggled)
+	p.clearButton.ConnectClicked(p.onClearClicked)
+
+	p.playlistGrid.ConnectActivate(p.onGridClicked)
+
+	p.headerbarStandalone.ConnectClose(p.onHeaderbarStandaloneClose)
+	p.standalonePlayButton.ConnectClicked(p.onStandalonePlayClicked)
+	p.standaloneRemoveButton.ConnectClicked(p.onStandaloneRemoveClicked)
+
+	p.selectionRemoveButton.ConnectClicked(p.onSelectionRemove)
+	p.selectionCancelButton.ConnectClicked(p.onSelectionCancel)
+}
+
+func (p *playlistPanel) ConnectStandalone(callback func(bool)) {
+	p.standaloneCallback = callback
+}
+
+func (p *playlistPanel) onSelectToggled() {
+	if p.selectButton.Active() {
+		p.actionbarRevealer.SetRevealChild(true)
+		p.playlistGrid.SetModel(p.selectionMulti)
+		p.playlistGrid.SetSingleClickActivate(false)
+		p.playlistGrid.StyleContext().AddClass("selection")
+	} else {
+		p.actionbarRevealer.SetRevealChild(false)
+		p.playlistGrid.SetModel(p.selectionSingle)
+		p.playlistGrid.SetSingleClickActivate(true)
+		p.playlistGrid.StyleContext().AddClass("selection")
+	}
+}
+
+func (p *playlistPanel) onClearClicked() {
+	client.Instance().ClearPlaylist()
+}
+
+func (p *playlistPanel) onGridClicked(position uint) {
+	// Get selected album
+	itemObj := p.playlistModel.Item(position)
+	if itemObj == nil {
+		return
+	}
+	strObj := itemObj.Cast().(*gtk.StringObject)
+	id := strObj.String()
+	album, found := p.albums[id]
+	if !found {
+		return
+	}
+
+	// Show standalone album
+	if p.playlistGrid.Model().Native() == p.selectionSingle.Native() {
+		p.standaloneAlbum = album
+		p.headerbarStandalone.SetAlbum(album.Album)
+		p.standaloneStack.SetVisibleChild(p.standaloneSpinner)
+		p.standaloneSpinner.Start()
+		p.openStandalone()
+		client.Instance().LoadAlbumart(album.Album)
+	}
+}
+
+func (p *playlistPanel) onHeaderbarStandaloneClose() {
+	p.closeStandalone()
+}
+
+func (p *playlistPanel) openStandalone() {
+	p.playlistStack.SetVisibleChild(p.panelStandalone)
+	if p.standaloneCallback != nil {
+		p.standaloneCallback(true)
+	}
+}
+
+func (p *playlistPanel) closeStandalone() {
+	p.playlistStack.SetVisibleChild(p.panelNormal)
+	if p.standaloneCallback != nil {
+		p.standaloneCallback(false)
+	}
+}
+
+func (p *playlistPanel) setCoverLoader(loader *CoverLoader) {
+	p.coverLoader = loader
+}
+
+func (p *playlistPanel) SetAlbumart(album *common.Album, albumart []byte) {
+	if p.standaloneAlbum == nil || album != p.standaloneAlbum.Album {
+		return
+	}
+
+	p.standalonePixbuf = nil
+	if albumart == nil || len(albumart) == 0 {
+		return
+	}
+
+	loader, loaderErr := loadPixbuf(albumart)
+	if loaderErr != nil {
+		log.Println("failed to load albumart for ", album.Title(), ":", loaderErr)
+		return
+	}
+
+	p.standalonePixbuf = loader.Pixbuf()
+	glib.IdleAdd(p.showStandaloneImage)
+}
+
+func (p *playlistPanel) showStandaloneImage() {
+	p.resizeStandaloneImage()
+	p.standaloneStack.SetVisibleChild(p.standaloneScroll)
+	p.standaloneSpinner.Stop()
+}
+
+func (p *playlistPanel) resizeStandaloneImage() {
+	newWidth, newHeight := p.getStandaloneSize()
+	if p.standalonePixbuf == nil {
+		p.standaloneImage.SetPixelSize(min(newWidth, newHeight))
+		return
+	}
+
+	width, height := p.calculateCoverSize(newWidth, newHeight)
+	if width <= 0 || height <= 0 {
+		return
+	}
+
+	scaledPixbuf := p.standalonePixbuf.ScaleSimple(width, height, gdkpixbuf.InterpHyper)
+	p.standaloneImage.SetFromPaintable(gdk.NewTextureForPixbuf(scaledPixbuf))
+	p.standaloneImage.SetPixelSize(min(width, height))
+}
+
+func (p *playlistPanel) getStandaloneSize() (int, int) {
+	return p.standaloneStack.Size(gtk.OrientationHorizontal), p.standaloneStack.Size(gtk.OrientationVertical)
+}
+
+func (p *playlistPanel) calculateCoverSize(currentWidth, currentHeight int) (width, height int) {
+	ratioWidth := float64(currentWidth) / float64(p.standalonePixbuf.Width())
+	ratioHeight := float64(currentHeight) / float64(p.standalonePixbuf.Height())
+	ratio := min(min(ratioWidth, ratioHeight), 1)
+
+	width = int(math.Floor(float64(p.standalonePixbuf.Width()) * ratio))
+	height = int(math.Floor(float64(p.standalonePixbuf.Height()) * ratio))
+
+	return
+}
+
+func (p *playlistPanel) onStandalonePlayClicked() {
+	client.Instance().PlayQueuedAlbum(p.standaloneAlbum)
+	p.closeStandalone()
+}
+
+func (p *playlistPanel) onStandaloneRemoveClicked() {
+	client.Instance().UnqueueAlbum(p.standaloneAlbum)
+	p.closeStandalone()
+}
+
+func (p *playlistPanel) onSelectionRemove() {
+	albums := p.getSelectedAlbums()
+	if len(albums) > 0 {
+		client.Instance().UnqueueAlbums(albums)
+	}
+
+	p.selectButton.SetActive(false)
+}
+
+func (p *playlistPanel) getSelectedAlbums() []*common.PlaylistAlbum {
+	albums := []*common.PlaylistAlbum{}
+	for i := range p.selectionMulti.NItems() {
+		if p.selectionMulti.IsSelected(i) {
+			itemObj := p.selectionMulti.Item(i)
+			if itemObj != nil {
+				itemStr := itemObj.Cast().(*gtk.StringObject)
+				albumID := itemStr.String()
+				album, found := p.albums[albumID]
+				if found {
+					albums = append(albums, album)
+				}
+			}
+		}
+	}
+
+	return albums
+}
+
+func (p *playlistPanel) onSelectionCancel() {
+	p.selectButton.SetActive(false)
+}
+
+func (p *playlistPanel) Toolbar() gtk.Widgetter {
+	return p.toolbar
+}
+
+func (p *playlistPanel) ItemSizeChanged() {
+	p.redraw()
+}
+
+func (p *playlistPanel) redraw() {
+	if len(p.playlist) > 0 {
+		p.SetPlaylist(p.playlist)
+	}
+}
+
+func (p *playlistPanel) SetPlaylist(playlist []*common.PlaylistAlbum) {
+	go p.setPlaylist(playlist)
+}
+
+func (p *playlistPanel) setPlaylist(playlist []*common.PlaylistAlbum) {
+	p.playlist = playlist
+
+	for _, album := range playlist {
+		p.albums[album.ID()] = album
+		if p.coverLoader != nil {
+			p.pixbufs[album.ID()] = p.coverLoader.LoadThumbnail(album.Album)
+		}
+	}
+
+	p.updateGridModel()
+}
+
+func (p *playlistPanel) updateGridModel() {
+	p.updateGrid(p.playlist)
+}
+
+func (p *playlistPanel) updateGrid(albums []*common.PlaylistAlbum) {
+	glib.IdleAdd(func() {
+		n := p.playlistModel.NItems()
+		if n > 0 {
+			p.playlistModel.Splice(0, n, nil)
+		}
+
+		ids := make([]string, 0, len(albums))
+		for _, item := range albums {
+			ids = append(ids, item.ID())
+		}
+
+		if len(ids) > 0 {
+			p.playlistModel.Splice(0, 0, ids)
+		}
+	})
+}
+
+func (p *playlistPanel) SetWidth(width int) {
+	p.resizeStandaloneImage()
+}
+
+func (p *playlistPanel) ClearPlaylist() {
+	client.Instance().ClearPlaylist()
+}
+
+func (p *playlistPanel) HeaderbarStandalone() *albumHeaderbar {
+	return p.headerbarStandalone
+}

internal/gui/serverpanel.go

@@ -0,0 +1,115 @@
+package gui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+	"suruatoel.xyz/mcg/internal/common"
+)
+
+type serverPanel struct {
+	*adw.Bin
+
+	toolbar         *gtk.Box
+	statusFile      *gtk.Label
+	statusAudio     *gtk.Label
+	statusBitrate   *gtk.Label
+	statusErrer     *gtk.Label
+	statsArtist     *gtk.Label
+	statsAlbums     *gtk.Label
+	statsSongs      *gtk.Label
+	statsDBPlaytime *gtk.Label
+	statsPlaytime   *gtk.Label
+	statsUptime     *gtk.Label
+	outputDevices   *gtk.ListBox
+
+	outputDeviceChangeCB OutputDeviceChangeCB
+}
+
+type OutputDeviceChangeCB func(device *common.OutputDevice, enable bool)
+
+func newServerPanel() *serverPanel {
+	panel := serverPanel{}
+	panel.loadWidgets()
+
+	return &panel
+}
+
+func (p *serverPanel) loadWidgets() {
+	builder := gtk.NewBuilderFromString(data.ServerPanelXML)
+
+	p.Bin = builder.GetObject("McgServerPanel").Cast().(*adw.Bin)
+	p.toolbar = builder.GetObject("toolbar").Cast().(*gtk.Box)
+	p.statusFile = builder.GetObject("status_file").Cast().(*gtk.Label)
+	p.statusAudio = builder.GetObject("status_audio").Cast().(*gtk.Label)
+	p.statusBitrate = builder.GetObject("status_bitrate").Cast().(*gtk.Label)
+	p.statusErrer = builder.GetObject("status_error").Cast().(*gtk.Label)
+	p.statsArtist = builder.GetObject("stats_artists").Cast().(*gtk.Label)
+	p.statsAlbums = builder.GetObject("stats_albums").Cast().(*gtk.Label)
+	p.statsSongs = builder.GetObject("stats_songs").Cast().(*gtk.Label)
+	p.statsDBPlaytime = builder.GetObject("stats_dbplaytime").Cast().(*gtk.Label)
+	p.statsPlaytime = builder.GetObject("stats_playtime").Cast().(*gtk.Label)
+	p.statsUptime = builder.GetObject("stats_uptime").Cast().(*gtk.Label)
+	p.outputDevices = builder.GetObject("output_devices").Cast().(*gtk.ListBox)
+}
+
+func (p *serverPanel) ReceiveOutputDeviceChange(callback OutputDeviceChangeCB) {
+	p.outputDeviceChangeCB = callback
+}
+
+func (p *serverPanel) Toolbar() gtk.Widgetter {
+	return p.toolbar
+}
+
+func (p *serverPanel) Status(file, audio, bitrate, errorMessage string) {
+	p.statusFile.SetText(file)
+	p.statusAudio.SetText(p.formatAudio(audio))
+	p.statusBitrate.SetText(p.formatBitrate(bitrate))
+	p.statusErrer.SetText(errorMessage)
+}
+
+func (p *serverPanel) formatAudio(audio string) string {
+	parts := strings.Split(audio, ":")
+	if len(parts) == 3 {
+		return fmt.Sprintf("%s Hz, %s bit, %s channels", parts[0], parts[1], parts[2])
+	}
+
+	return ""
+}
+
+func (p *serverPanel) formatBitrate(bitrate string) string {
+	if bitrate != "" {
+		return bitrate + " kb/s"
+	}
+
+	return ""
+}
+
+func (p *serverPanel) Statistics(artists, albums, songs, dbplaytime, playtime, uptime string) {
+	p.statsArtist.SetText(artists)
+	p.statsAlbums.SetText(albums)
+	p.statsSongs.SetText(songs)
+	p.statsDBPlaytime.SetText(dbplaytime)
+	p.statsPlaytime.SetText(playtime)
+	p.statsUptime.SetText(uptime)
+}
+
+func (p *serverPanel) OutputDevices(devices []*common.OutputDevice) {
+	p.outputDevices.RemoveAll()
+	for _, device := range devices {
+		deviceButton := gtk.NewCheckButtonWithLabel(device.Name)
+		if device.Enabled {
+			deviceButton.SetActive(true)
+		}
+		deviceButton.ConnectToggled(func() {
+			if p.outputDeviceChangeCB != nil {
+				p.outputDeviceChangeCB(device, deviceButton.Active())
+			}
+		})
+
+		p.outputDevices.Insert(deviceButton, -1)
+	}
+}

internal/gui/shortcutsdialog.go

@@ -0,0 +1,23 @@
+package gui
+
+import (
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+)
+
+type shortcutsDialog struct {
+	*gtk.ShortcutsWindow
+}
+
+func newShortcutsDialog() *shortcutsDialog {
+	dialog := shortcutsDialog{}
+	dialog.loadWidgets()
+
+	return &dialog
+}
+
+func (d *shortcutsDialog) loadWidgets() {
+	builder := gtk.NewBuilderFromString(data.ShortcutsDialogXML)
+
+	d.ShortcutsWindow = builder.GetObject("McgShortcutsDialog").Cast().(*gtk.ShortcutsWindow)
+}

internal/gui/window.go

@@ -0,0 +1,454 @@
+package gui
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
+	"github.com/diamondburned/gotk4/pkg/gdk/v4"
+	"github.com/diamondburned/gotk4/pkg/gio/v2"
+	"github.com/diamondburned/gotk4/pkg/glib/v2"
+	"github.com/diamondburned/gotk4/pkg/gtk/v4"
+	"suruatoel.xyz/mcg/data"
+	"suruatoel.xyz/mcg/internal/client"
+	"suruatoel.xyz/mcg/internal/common"
+	"suruatoel.xyz/mcg/internal/i18n"
+)
+
+type Panel interface {
+	Toolbar() gtk.Widgetter
+}
+
+type GridPanel interface {
+	HeaderbarStandalone() *albumHeaderbar
+}
+
+type mainWindow struct {
+	*adw.ApplicationWindow
+
+	toggleFullscreenAction *gio.SimpleAction
+	playAaction            *gio.SimpleAction
+	panelAction            *gio.SimpleAction
+	clearPlaylistAction    *gio.SimpleAction
+	searchLibraryAction    *gio.SimpleAction
+
+	toolbarView         *adw.ToolbarView
+	headerBar           *adw.HeaderBar
+	connectButton       *gtk.Switch
+	connectButtonActive bool
+	playButton          *gtk.ToggleButton
+	playButtonActive    bool
+	volumeButton        *gtk.VolumeButton
+	settingVolume       bool
+	toolbarStack        *gtk.Stack
+	infoToast           *adw.ToastOverlay
+	contentStack        *gtk.Stack
+	connectionPanel     *connectionPanel
+	panelStack          *adw.ViewStack
+	serverPanel         *serverPanel
+	coverPanel          *coverPanel
+	playlistPanel       *playlistPanel
+	libraryPanel        *libraryPanel
+	resizeHelper        *gtk.DrawingArea
+
+	panels       map[string]Panel
+	currentWidth int
+	coverLoader  *CoverLoader
+}
+
+func newMainWindow(app *gtk.Application, config Configuration) *mainWindow {
+	window := mainWindow{
+		panels: make(map[string]Panel),
+	}
+	window.loadWidgets(app, config)
+	window.connectSignals()
+	window.registerActions()
+	window.SetHelpOverlay(newShortcutsDialog().ShortcutsWindow)
+
+	return &window
+}
+
+func (w *mainWindow) loadWidgets(app *gtk.Application, config Configuration) {
+	builder := gtk.NewBuilderFromString(data.WindowXML)
+	w.ApplicationWindow = builder.GetObject("McgAppWindow").Cast().(*adw.ApplicationWindow)
+	w.ApplicationWindow.SetApplication(app)
+
+	w.toolbarView = builder.GetObject("toolbar_view").Cast().(*adw.ToolbarView)
+	w.headerBar = builder.GetObject("headerbar").Cast().(*adw.HeaderBar)
+
+	w.connectButton = builder.GetObject("headerbar_button_connect").Cast().(*gtk.Switch)
+	w.connectButtonActive = true
+
+	w.playButton = builder.GetObject("headerbar_button_playpause").Cast().(*gtk.ToggleButton)
+	w.playButtonActive = true
+
+	w.volumeButton = builder.GetObject("headerbar_button_volume").Cast().(*gtk.VolumeButton)
+	w.volumeButton.ConnectValueChanged(w.OnVolumeChanged)
+
+	w.toolbarStack = builder.GetObject("toolbar_stack").Cast().(*gtk.Stack)
+
+	w.infoToast = builder.GetObject("info_toast").Cast().(*adw.ToastOverlay)
+
+	w.contentStack = builder.GetObject("content_stack").Cast().(*gtk.Stack)
+
+	w.connectionPanel = newConnectionPanel(config)
+	w.contentStack.AddChild(w.connectionPanel)
+	w.contentStack.SetVisibleChild(w.connectionPanel)
+
+	// Server panel
+	w.serverPanel = newServerPanel()
+	w.panels["server"] = w.serverPanel
+	w.serverPanel.ReceiveOutputDeviceChange(w.OnServerPanelOutputDeviceChange)
+
+	// Cover panel
+	w.coverPanel = newCoverPanel()
+	w.panels["cover"] = w.coverPanel
+
+	// Playlist panel
+	w.playlistPanel = newPlaylistPanel()
+	w.panels["playlist"] = w.playlistPanel
+
+	// Library panel
+	w.libraryPanel = newLibraryPanel(config)
+	w.panels["library"] = w.serverPanel
+
+	// Panel stack
+	w.panelStack = builder.GetObject("panel_stack").Cast().(*adw.ViewStack)
+	w.panelStack.AddTitledWithIcon(w.serverPanel, "server", i18n.T("Server"), "network-wired-symbolic")
+	w.panelStack.AddTitledWithIcon(w.coverPanel, "cover", i18n.T("Cover"), "image-x-generic-symbolic")
+	w.panelStack.AddTitledWithIcon(w.playlistPanel, "playlist", i18n.T("Playlist"), "view-list-symbolic")
+	w.panelStack.AddTitledWithIcon(w.libraryPanel, "library", i18n.T("Library"), "emblem-music-symbolic")
+	if _, found := w.panels[config.Panel]; found {
+		w.panelStack.SetVisibleChildName(config.Panel)
+	} else {
+		log.Println("configured initial panel name is unknown:", config.Panel)
+	}
+
+	// Toolbar stack
+	w.toolbarStack.AddNamed(w.serverPanel.Toolbar(), "server")
+	w.toolbarStack.AddNamed(w.coverPanel.Toolbar(), "cover")
+	w.toolbarStack.AddNamed(w.playlistPanel.Toolbar(), "playlist")
+	w.toolbarStack.AddNamed(w.libraryPanel.Toolbar(), "library")
+	w.toolbarStack.SetVisibleChildName(config.Panel)
+
+	w.resizeHelper = builder.GetObject("resize_helper").Cast().(*gtk.DrawingArea)
+}
+
+func (w *mainWindow) connectSignals() {
+	w.connectButton.Connect("notify::active", func() {
+		w.connect()
+	})
+	w.connectButton.ConnectStateSet(w.OnConnectStateSet)
+
+	w.playButton.ConnectToggled(w.OnPlayPauseToggled)
+
+	w.panelStack.Connect("notify::visible-child", w.OnPanelStackSwitched)
+	w.resizeHelper.ConnectResize(w.OnWindowResize)
+
+	w.coverPanel.ConnectFullscreen(w.OnCoverPanelFullscreen)
+	w.Connect("notify::fullscreened", w.OnWindowFullscreen)
+
+	w.playlistPanel.ConnectStandalone(w.OnPlaylistPanelStandalone)
+
+	w.libraryPanel.ConnectItemSizeChanged(w.onLibraryPanelItemSizeChanged)
+	w.libraryPanel.ConnectStandalone(w.OnLibraryPanelStandalone)
+
+	clientInstance := client.Instance()
+	clientInstance.ReceiveError(w.OnClientError)
+	clientInstance.RegisterConnection(w.OnClientConnection)
+	clientInstance.ReceiveStatus(w.OnClientStatus)
+	clientInstance.ReceiveStatistics(w.OnClientStatistics)
+	clientInstance.ReceiveOutputDevices(w.OnClientOutputDevces)
+	clientInstance.ReceivePlaylist(w.OnClientPlaylist)
+	clientInstance.ReceiveAlbums(w.OnClientAlbums)
+	clientInstance.ReceiveAlbumart(w.OnClientAlbumart)
+}
+
+func (w *mainWindow) registerActions() {
+	connectAction := gio.NewSimpleAction("connect", nil)
+	connectAction.ConnectActivate(func(_ *glib.Variant) {
+		w.connect()
+	})
+	w.AddAction(connectAction)
+
+	w.playAaction = gio.NewSimpleAction("play", nil)
+	w.playAaction.SetEnabled(false)
+	w.playAaction.ConnectActivate(func(_ *glib.Variant) {
+		w.OnPlayPauseToggled()
+	})
+	w.AddAction(w.playAaction)
+
+	w.clearPlaylistAction = gio.NewSimpleAction("clear-playlist", nil)
+	w.clearPlaylistAction.SetEnabled(false)
+	w.clearPlaylistAction.ConnectActivate(func(_ *glib.Variant) {
+		w.playlistPanel.ClearPlaylist()
+	})
+	w.AddAction(w.clearPlaylistAction)
+
+	panelVariant := glib.NewVariantString("server")
+	w.panelAction = gio.NewSimpleActionStateful("panel", panelVariant.Type(), panelVariant)
+	w.panelAction.SetEnabled(false)
+	w.panelAction.ConnectActivate(func(value *glib.Variant) {
+		panelName := value.String()
+		w.panelStack.SetVisibleChildName(panelName)
+	})
+	w.AddAction(w.panelAction)
+
+	w.toggleFullscreenAction = gio.NewSimpleAction("toggle-fullscreen", nil)
+	w.toggleFullscreenAction.SetEnabled(false)
+	w.toggleFullscreenAction.ConnectActivate(func(_ *glib.Variant) {
+		w.Fullscreen()
+	})
+	w.AddAction(w.toggleFullscreenAction)
+
+	w.searchLibraryAction = gio.NewSimpleAction("search-library", nil)
+	w.searchLibraryAction.SetEnabled(false)
+	w.searchLibraryAction.ConnectActivate(func(_ *glib.Variant) {
+		w.panelStack.SetVisibleChild(w.libraryPanel)
+		w.libraryPanel.ShowSearch()
+	})
+	w.AddAction(w.searchLibraryAction)
+}
+
+func (w *mainWindow) OnPanelStackSwitched() {
+	w.setVisibleToolbar()
+}
+
+func (w *mainWindow) setVisibleToolbar() {
+	name := w.panelStack.VisibleChildName()
+	w.toolbarStack.SetVisibleChildName(name)
+}
+
+func (w *mainWindow) OnWindowFullscreen() {
+	w.reactToFullscreen()
+}
+
+func (w *mainWindow) reactToFullscreen() {
+	var cursor *gdk.Cursor
+	if w.IsFullscreen() {
+		w.panelStack.SetVisibleChild(w.coverPanel)
+		w.headerBar.SetVisible(false)
+		w.coverPanel.Fullscreen(true)
+		cursor = gdk.NewCursorFromName("none", nil)
+	} else {
+		w.headerBar.SetVisible(true)
+		w.coverPanel.Fullscreen(false)
+		cursor = gdk.NewCursorFromName("default", nil)
+	}
+
+	w.SetCursor(cursor)
+}
+
+func (w *mainWindow) OnCoverPanelFullscreen() {
+	if w.IsFullscreen() {
+		w.Unfullscreen()
+	} else {
+		w.Fullscreen()
+	}
+}
+
+func (w *mainWindow) OnPlaylistPanelStandalone(open bool) {
+	w.onPanelStandalone(w.playlistPanel, open)
+}
+
+func (w *mainWindow) onLibraryPanelItemSizeChanged(itemSize int) {
+	w.coverLoader.SetSize(itemSize)
+	w.playlistPanel.ItemSizeChanged()
+}
+
+func (w *mainWindow) OnLibraryPanelStandalone(open bool) {
+	w.onPanelStandalone(w.libraryPanel, open)
+}
+
+func (w *mainWindow) onPanelStandalone(panel GridPanel, open bool) {
+	if open {
+		w.toolbarView.AddTopBar(panel.HeaderbarStandalone())
+		w.toolbarView.Remove(w.headerBar)
+	} else {
+		w.toolbarView.AddTopBar(w.headerBar)
+		w.toolbarView.Remove(panel.HeaderbarStandalone())
+	}
+}
+
+func (w *mainWindow) connect() {
+	if !w.connectButtonActive {
+		return
+	}
+
+	if client.Instance().IsConnected() {
+		w.libraryPanel.Wait()
+		client.Instance().Disconnect()
+	} else {
+		client.Instance().Connect(w.connectionPanel.ConnectionDetails())
+	}
+}
+
+func (w *mainWindow) OnClientConnection(connected bool) {
+	glib.IdleAdd(func() {
+		w.connectButtonActive = false
+		w.connectButton.SetActive(connected)
+		w.connectButton.SetState(connected)
+		w.connectButtonActive = true
+
+		w.playButton.SetSensitive(connected)
+		w.volumeButton.SetSensitive(connected)
+		w.playAaction.SetEnabled(connected)
+		w.panelAction.SetEnabled(connected)
+		if connected {
+			w.contentStack.SetVisibleChild(w.panelStack)
+		} else {
+			w.contentStack.SetVisibleChild(w.connectionPanel)
+		}
+
+		w.clearPlaylistAction.SetEnabled(connected)
+		w.searchLibraryAction.SetEnabled(connected)
+	})
+
+	host, _, _ := w.connectionPanel.ConnectionDetails()
+	w.coverLoader = NewCoverLoader(host)
+	w.playlistPanel.setCoverLoader(w.coverLoader)
+	w.libraryPanel.setCoverLoader(w.coverLoader)
+}
+
+func (w *mainWindow) SetConfigError(err error) {
+	glib.IdleAdd(func() {
+		w.infoToast.AddToast(adw.NewToast(fmt.Sprintf("Loading the configuration has failed: %s", err.Error())))
+	})
+}
+
+func (w *mainWindow) UpdateConfig(config *Configuration) {
+	config.Panel = w.panelStack.VisibleChildName()
+
+	w.connectionPanel.UpdateConfig(config)
+	w.libraryPanel.UpdateConfig(config)
+}
+
+func (w *mainWindow) OnClientError(message string) {
+	glib.IdleAdd(func() {
+		w.infoToast.AddToast(adw.NewToast(message))
+	})
+}
+
+func (w *mainWindow) OnClientStatus(state string, album *common.PlaylistAlbum, pos uint64, time uint64, volume int64, file string, audio string, bitrate string, errorMessage string) {
+	// Album
+	glib.IdleAdd(func() {
+		w.coverPanel.SetAlbum(state, album)
+	})
+	w.toggleFullscreenAction.SetEnabled(album != nil)
+
+	// Fullscreen
+	if w.IsFullscreen() && album == nil {
+		w.Unfullscreen()
+	}
+
+	// State
+	if state == "play" {
+		glib.IdleAdd(func() {
+			w.setPlayPause(true)
+		})
+		glib.IdleAdd(func() {
+			w.coverPanel.SetPlay(pos, time)
+		})
+	} else if state == "pause" || state == "stop" {
+		glib.IdleAdd(func() {
+			w.setPlayPause(false)
+		})
+		w.coverPanel.SetPause()
+	}
+	// Volume
+	glib.IdleAdd(func() {
+		w.setVolume(volume)
+	})
+
+	glib.IdleAdd(func() {
+		w.serverPanel.Status(file, audio, bitrate, errorMessage)
+	})
+}
+
+func (w *mainWindow) OnClientStatistics(artists, albums, songs, dbplaytime, playtime, uptime string) {
+	glib.IdleAdd(func() {
+		w.serverPanel.Statistics(artists, albums, songs, dbplaytime, playtime, uptime)
+	})
+}
+
+func (w *mainWindow) OnClientOutputDevces(devices []*common.OutputDevice) {
+	glib.IdleAdd(func() {
+		w.serverPanel.OutputDevices(devices)
+	})
+}
+
+func (w *mainWindow) OnClientPlaylist(playlist []*common.PlaylistAlbum) {
+	w.playlistPanel.SetPlaylist(playlist)
+}
+
+func (w *mainWindow) OnClientAlbums(albums map[string]*common.Album) {
+	w.libraryPanel.SetAlbums(albums)
+}
+
+func (w *mainWindow) OnClientAlbumart(album *common.Album, albumart []byte) {
+	w.coverPanel.SetAlbumart(album, albumart)
+	w.playlistPanel.SetAlbumart(album, albumart)
+	w.libraryPanel.SetAlbumart(album, albumart)
+}
+
+func (w *mainWindow) OnConnectStateSet(state bool) bool {
+	return true
+}
+
+func (w *mainWindow) OnPlayPauseToggled() {
+	if w.playButtonActive {
+		client.Instance().PlayPause()
+	}
+}
+
+func (w *mainWindow) OnVolumeChanged(value float64) {
+	if !w.settingVolume {
+		client.Instance().SetVolume(int(value * 100))
+	}
+}
+
+func (w *mainWindow) setPlayPause(play bool) {
+	w.playButtonActive = false
+	w.playButton.SetActive(play)
+	w.playButtonActive = true
+}
+
+func (w *mainWindow) setVolume(volume int64) {
+	if volume >= 0 {
+		w.volumeButton.SetVisible(true)
+		w.settingVolume = true
+		w.volumeButton.SetValue(float64(volume) / 100.0)
+		w.settingVolume = false
+	} else {
+		w.volumeButton.SetVisible(false)
+	}
+}
+
+func (w *mainWindow) OnServerPanelOutputDeviceChange(device *common.OutputDevice, enable bool) {
+	client.Instance().SetOutputDeviceState(device, enable)
+}
+
+func (w *mainWindow) OnWindowResize(width int, _ int) {
+	if !w.hasWidthChanged(width) {
+		return
+	}
+	w.setWidth(width)
+
+	if width > 0 {
+		w.updateUIWidth()
+	}
+}
+
+func (w *mainWindow) hasWidthChanged(width int) bool {
+	return width != w.currentWidth
+}
+
+func (w *mainWindow) setWidth(width int) {
+	w.currentWidth = width
+}
+
+func (w *mainWindow) updateUIWidth() {
+	w.coverPanel.SetWidth(w.currentWidth)
+	w.playlistPanel.SetWidth(w.currentWidth)
+	w.libraryPanel.SetWidth(w.currentWidth)
+}