This closes #1416, support set row outline level to stream (#1422)

Co-authored-by: TlyupovBM <bajjzet.tlyupov@vseinstrumenti.ru>

stream.go

@@ -313,6 +313,7 @@ type RowOpts struct {
 	Height       float64
 	Hidden       bool
 	StyleID      int
+	OutlineLevel int
 }
 
 // marshalAttrs prepare attributes of the row.
@@ -328,6 +329,10 @@ func (r *RowOpts) marshalAttrs() (strings.Builder, error) {
 		err = ErrMaxRowHeight
 		return attrs, err
 	}
+	if r.OutlineLevel > 7 {
+		err = ErrOutlineLevel
+		return attrs, err
+	}
 	if r.StyleID > 0 {
 		attrs.WriteString(` s="`)
 		attrs.WriteString(strconv.Itoa(r.StyleID))
@@ -338,6 +343,11 @@ func (r *RowOpts) marshalAttrs() (strings.Builder, error) {
 		attrs.WriteString(strconv.FormatFloat(r.Height, 'f', -1, 64))
 		attrs.WriteString(`" customHeight="1"`)
 	}
+	if r.OutlineLevel > 0 {
+		attrs.WriteString(` outlineLevel="`)
+		attrs.WriteString(strconv.Itoa(r.OutlineLevel))
+		attrs.WriteString(`"`)
+	}
 	if r.Hidden {
 		attrs.WriteString(` hidden="1"`)
 	}

stream_test.go

@@ -358,3 +358,31 @@ func TestStreamSetCellValFunc(t *testing.T) {
 	assert.NoError(t, sw.setCellValFunc(c, nil))
 	assert.NoError(t, sw.setCellValFunc(c, complex64(5+10i)))
 }
+
+func TestStreamWriterOutlineLevel(t *testing.T) {
+	file := NewFile()
+	streamWriter, err := file.NewStreamWriter("Sheet1")
+	assert.NoError(t, err)
+
+	// Test set outlineLevel in row.
+	assert.NoError(t, streamWriter.SetRow("A1", nil, RowOpts{OutlineLevel: 1}))
+	assert.NoError(t, streamWriter.SetRow("A2", nil, RowOpts{OutlineLevel: 7}))
+	assert.ErrorIs(t, ErrOutlineLevel, streamWriter.SetRow("A3", nil, RowOpts{OutlineLevel: 8}))
+
+	assert.NoError(t, streamWriter.Flush())
+	// Save spreadsheet by the given path.
+	assert.NoError(t, file.SaveAs(filepath.Join("test", "TestStreamWriterSetRowOutlineLevel.xlsx")))
+
+	file, err = OpenFile(filepath.Join("test", "TestStreamWriterSetRowOutlineLevel.xlsx"))
+	assert.NoError(t, err)
+	level, err := file.GetRowOutlineLevel("Sheet1", 1)
+	assert.NoError(t, err)
+	assert.Equal(t, uint8(1), level)
+	level, err = file.GetRowOutlineLevel("Sheet1", 2)
+	assert.NoError(t, err)
+	assert.Equal(t, uint8(7), level)
+	level, err = file.GetRowOutlineLevel("Sheet1", 3)
+	assert.NoError(t, err)
+	assert.Equal(t, uint8(0), level)
+	assert.NoError(t, file.Close())
+}