feat(textarea): add SetOffset and CursorPosition methods

textarea/textarea.go

@@ -291,6 +291,9 @@ type Model struct {
 	// Cursor row.
 	row int
 
+	// The bubble offset in the parent model.
+	offsetX, offsetY int
+
 	// Last character offset, used to maintain state when the cursor is moved
 	// vertically such that we can maintain the same navigating position.
 	lastCharOffset int
@@ -522,6 +525,11 @@ func (m Model) Line() int {
 	return m.row
 }
 
+// SetOffset sets the bubble offset in the parent model.
+func (m *Model) SetOffset(x, y int) {
+	m.offsetX, m.offsetY = x, y
+}
+
 // CursorDown moves the cursor down by one line.
 // Returns whether or not the cursor blink should be reset.
 func (m *Model) CursorDown() {
@@ -592,6 +600,11 @@ func (m *Model) CursorUp() {
 	}
 }
 
+// CursorPosition returns the current cursor position.
+func (m Model) CursorPosition() (int, int) {
+	return m.col, m.row
+}
+
 // SetCursor moves the cursor to the given position. If the position is
 // out of bounds the cursor will be moved to the start or end accordingly.
 func (m *Model) SetCursor(col int) {
@@ -1150,6 +1163,8 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 	cmds = append(cmds, cmd)
 
 	newRow, newCol := m.cursorLineNumber(), m.col
+	cmds = append(cmds, tea.SetCursorPosition(m.offsetX+newCol, m.offsetY+newRow))
+
 	m.Cursor, cmd = m.Cursor.Update(msg)
 	if (newRow != oldRow || newCol != oldCol) && m.Cursor.Mode() == cursor.CursorBlink {
 		m.Cursor.Blink = false