basic listbox selection working

main.go

@@ -31,6 +31,7 @@ var validFileTypes = []tk.FileType{
 
 var metaActive bool
 var fileList *tk.ToplevelWidget
+var lb *tk.ListboxWidget
 
 var directoryState struct {
 	currentDirectory string
@@ -159,9 +160,22 @@ func main() {
 				if fileList == nil {
 					fileList = tk.Toplevel()
 					fileList.WmTitle("files")
+					lb = fileList.Listbox(tk.Height(0))
+					for i := range directoryState.images {
+						lb.Insert("end", directoryState.images[i])
+						if directoryState.currentFile == directoryState.images[i] {
+							lb.SelectionSet(i)
+						}
+					}
+					tk.Pack(lb)
+					tk.Bind(lb, "<<ListboxSelect>>", tk.Command(func() {
+						selection := lb.Curselection()
+						updateImage(filepath.Join(directoryState.currentDirectory, directoryState.images[selection[0]]), img)
+					}))
 					tk.Bind(fileList, "<Destroy>", tk.Command(func(e *tk.Event) {
 						// list closed by user click on <x>
 						fileList = nil
+						lb = nil
 					}))
 				} else {
 					// list closed by Meta-a
@@ -171,10 +185,18 @@ func main() {
 		case "Up":
 			if curr > 0 {
 				updateImage(filepath.Join(directoryState.currentDirectory, directoryState.images[curr-1]), img)
+				if lb != nil {
+					lb.SelectionClear("0", "end")
+					lb.SelectionSet(curr - 1)
+				}
 			}
 		case "Down":
 			if curr < len(directoryState.images)-1 && curr != -1 {
 				updateImage(filepath.Join(directoryState.currentDirectory, directoryState.images[curr+1]), img)
+				if lb != nil {
+					lb.SelectionClear("0", "end")
+					lb.SelectionSet(curr + 1)
+				}
 			}
 		}
 	}))