more settings dialog work

ui/widgets/textrestrictedentry.go

@@ -0,0 +1,41 @@
+package widgets
+
+import (
+	"strings"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+)
+
+type TextRestrictedEntry struct {
+	widget.Entry
+
+	charAllowed func(string, rune) bool
+
+	minWidth float32
+}
+
+func NewTextRestrictedEntry(charAllowed func(curText string, r rune) bool) *TextRestrictedEntry {
+	e := &TextRestrictedEntry{charAllowed: charAllowed}
+	e.ExtendBaseWidget(e)
+	return e
+}
+
+func (e *TextRestrictedEntry) TypedRune(r rune) {
+	if e.charAllowed == nil || e.charAllowed(e.Text, r) {
+		e.Entry.TypedRune(r)
+	}
+}
+
+func (e *TextRestrictedEntry) SetMinCharWidth(numChars int) {
+	e.minWidth = theme.Padding()*2 + fyne.MeasureText(strings.Repeat("W", numChars),
+		fyne.CurrentApp().Settings().Theme().Size(theme.SizeNameText), e.TextStyle).Width
+}
+
+func (e *TextRestrictedEntry) MinSize() fyne.Size {
+	if e.minWidth < 0.001 {
+		return e.Entry.MinSize()
+	}
+	return fyne.NewSize(e.minWidth, e.Entry.MinSize().Height)
+}