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+// Checkbox is a clickable box that indicates some Boolean value.
+type Checkbox interface {
+	Control
+
+	// OnClicked sets the event handler for when the Checkbox is clicked (to change its toggle state).
+	// TODO change to OnCheckChanged or OnToggled?
+	OnClicked(func(d Doer))
+
+	// Text and SetText are Requests that get and set the Checkbox's label text.
+	Text() *Request
+	SetText(text string) *Request
+
+	// Checked and SetChecked are Requests that get and set the Checkbox's check state.
+	Checked() *Request
+	SetChecked(checked bool) *Request
+}
+
+// NewCheckbox creates a new Checkbox with the given label text.
+// The Checkbox will be initially unchecked.
+func NewCheckbox(text string) Checkbox {
+	return newCheckbox(text)
+}
+
+// Combobox is a drop-down list from which one item can be selected.
+// Each item of a Combobox is a text string.
+// The Combobox can optionally be editable, in which case the user can type in a selection not in the list.
+// [TODO If an item is selected in an editable Combobox, the edit field will be changed ot reflect the selection.]
+type Combobox interface {
+	Control
+
+	// TODO events
+
+	// Append, InsertBefore, and Delete are Requests that change the Combobox's list.
+	// InsertBefore and Delete panic if the index passed in is out of range.
+	Append(item string) *Request
+	InsertBefore(item string, before int) *Request
+	Delete(index int) *Request
+
+	// SelectedIndex and SelectedText are Requests that return the current Combobox selection, either as the index into the list or as its label.
+	// SelectedIndex returns -1 and SelectedText returns an empty string if no selection has been made.
+	// If the Combobox is editable, SelectedIndex returns -1 if the user has entered their own string, in which case SelectedText will return that string.
+	SelectedIndex() *Request
+	SelectedText() *Request
+
+	// SelectIndex is a Request that selects an index from the list.
+	// SelectIndex panics if the given index is out of range.
+	// [TODO SelectText or SetCustomText]
+	SelectIndex(index int) *Request
+
+	// Len is a Request that returns the number of items in the list.
+	// At is a Request that returns a given item's text.
+	// At panics if the given index is out of range.
+	Len() *Request
+	At(index int) *Request
+}
+
+// NewCombobox creates a new Combobox with the given items.
+// The Checkbox will have nothing selected initially.
+func NewCombobox(items ...string) Combobox {
+	return newCombobox(items)
+}
+
+// NewEditableCombobox creates a new editable Combobox with the given items.
+// The Combobox will have nothing selected initially and no custom text initially.
+func NewEditableCombobox(items ...string) Combobox {
+	return newEditableCombobox(items)
+}
+
+// LineEdit
+// Label
+// Listox
+// ProgressBar
+// (Area, Stack, and Grid will remain in their own file)