Add GTK application implementation

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
+}