Changed keyboard back to numerical one

ztm_vehicles_app.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+
 	"strings"
 
 	"fyne.io/fyne/v2/app"
@@ -10,10 +11,46 @@ import (
 	"github.com/gocolly/colly/v2"
 
 	"fyne.io/fyne/v2"
-
 	"fyne.io/fyne/v2/layout"
+
+	"strconv"
+
+	"fyne.io/fyne/v2/driver/mobile"
 )
 
+type numericalEntry struct {
+	widget.Entry
+}
+
+func newNumericalEntry() *numericalEntry {
+	entry := &numericalEntry{}
+	entry.ExtendBaseWidget(entry)
+	return entry
+}
+
+func (e *numericalEntry) TypedRune(r rune) {
+	if (r >= '0' && r <= '9') || r == '.' || r == ',' {
+		e.Entry.TypedRune(r)
+	}
+}
+
+func (e *numericalEntry) TypedShortcut(shortcut fyne.Shortcut) {
+	paste, ok := shortcut.(*fyne.ShortcutPaste)
+	if !ok {
+		e.Entry.TypedShortcut(shortcut)
+		return
+	}
+
+	content := paste.Clipboard.Content()
+	if _, err := strconv.ParseFloat(content, 64); err == nil {
+		e.Entry.TypedShortcut(shortcut)
+	}
+}
+
+func (e *numericalEntry) Keyboard() mobile.KeyboardType {
+	return mobile.NumberKeyboard
+}
+
 type vehicle struct {
 	producer                   string
 	model                      string
@@ -97,7 +134,7 @@ func main() {
 	w := a.NewWindow("ZTM vehicles")
 
 	entryLabel := widget.NewLabel("Podaj numer taborowy pojazdu:")
-	entry := widget.NewEntry()
+	entry := newNumericalEntry()
 	output := widget.NewLabel("")
 	output.Wrapping = fyne.TextWrapWord