Allow theme to be set only once

field_confirm.go

@@ -219,6 +219,9 @@ func (c *Confirm) String() string {
 
 // WithTheme sets the theme of the confirm field.
 func (c *Confirm) WithTheme(theme *Theme) Field {
+	if c.theme != nil {
+		return c
+	}
 	c.theme = theme
 	return c
 }

field_input.go

@@ -270,6 +270,9 @@ func (i *Input) WithAccessible(accessible bool) Field {
 
 // WithTheme sets the theme of the input field.
 func (i *Input) WithTheme(theme *Theme) Field {
+	if i.theme != nil {
+		return i
+	}
 	i.theme = theme
 	return i
 }

field_multiselect.go

@@ -468,6 +468,9 @@ func (m *MultiSelect[T]) runAccessible() error {
 
 // WithTheme sets the theme of the multi-select field.
 func (m *MultiSelect[T]) WithTheme(theme *Theme) Field {
+	if m.theme != nil {
+		return m
+	}
 	m.theme = theme
 	m.filter.Cursor.Style = m.theme.Focused.TextInput.Cursor
 	m.filter.PromptStyle = m.theme.Focused.TextInput.Prompt

field_note.go

@@ -152,6 +152,9 @@ func (n *Note) runAccessible() error {
 
 // WithTheme sets the theme on a note field.
 func (n *Note) WithTheme(theme *Theme) Field {
+	if n.theme != nil {
+		return n
+	}
 	n.theme = theme
 	return n
 }

field_select.go

@@ -402,6 +402,9 @@ func (s *Select[T]) runAccessible() error {
 
 // WithTheme sets the theme of the select field.
 func (s *Select[T]) WithTheme(theme *Theme) Field {
+	if s.theme != nil {
+		return s
+	}
 	s.theme = theme
 	s.filter.Cursor.Style = s.theme.Focused.TextInput.Cursor
 	s.filter.PromptStyle = s.theme.Focused.TextInput.Prompt

field_text.go

@@ -286,6 +286,9 @@ func (t *Text) runAccessible() error {
 
 // WithTheme sets the theme on a text field.
 func (t *Text) WithTheme(theme *Theme) Field {
+	if t.theme != nil {
+		return t
+	}
 	t.theme = theme
 	return t
 }