Added TextStyle Horizontal Alignment

CHANGELOG.md

@@ -21,6 +21,7 @@ This can also be enabled programmatically with `warnings.simplefilter('default',
 * new optional parameter `border` for table cells [issue #1192](https://github.com/py-pdf/fpdf2/issues/1192) users can define specific borders (left, right, top, bottom) for individual cells
 * [`FPDF.write_html()`](https://py-pdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.fpdf.FPDF.write_html): now parses `<title>` tags to set the [document title](https://py-pdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.fpdf.FPDF.set_title). By default, it is added as PDF metadata, but not rendered in the document body. However, this can be enabled by passing `render_title_tag=True` to `FPDF.write_html()`.
 * support for LZWDecode compression [issue #1271](https://github.com/py-pdf/fpdf2/issues/1271)
+* support for passing `Align` values (along with string values like `'C'`, `'L'`, `'R'`) in `l_margin` of `TextStyle` to horizontally align text [issue #1282](https://github.com/py-pdf/fpdf2/issues/1282)
 * [text_annotation()](https://py-pdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.fpdf.FPDF.text_annotation) has a new optional `title` parameter
 ### Fixed
 * `FPDF.set_text_shaping(False)` was broken since version 2.7.8 and is now working properly - [issue #1287](https://github.com/py-pdf/fpdf2/issues/1287)

fpdf/fonts.py

@@ -33,7 +33,7 @@ def __deepcopy__(self, _memo):
 
 from .deprecation import get_stack_level
 from .drawing import convert_to_device_color, DeviceGray, DeviceRGB
-from .enums import FontDescriptorFlags, TextEmphasis
+from .enums import FontDescriptorFlags, TextEmphasis, Align
 from .syntax import Name, PDFObject
 from .util import escape_parens
 
@@ -125,7 +125,7 @@ def __init__(
         fill_color: Union[int, tuple] = None,  # grey scale or (red, green, blue),
         underline: bool = False,
         t_margin: Optional[int] = None,
-        l_margin: Optional[int] = None,
+        l_margin: Union[Optional[int], Optional[Align], Optional[str]] = None,
         b_margin: Optional[int] = None,
     ):
         super().__init__(
@@ -136,7 +136,15 @@ def __init__(
             fill_color,
         )
         self.t_margin = t_margin or 0
-        self.l_margin = l_margin or 0
+
+        # added support for 'Align' and 'str' type values for l_margin
+        if isinstance(l_margin, (Align, int)):
+            self.l_margin = l_margin
+        elif isinstance(l_margin, str):
+            self.l_margin = Align.coerce(l_margin)
+        else:
+            self.l_margin = 0
+
         self.b_margin = b_margin or 0
 
     def __repr__(self):

fpdf/fpdf.py

@@ -5115,6 +5115,10 @@ def start_section(self, name, level=0, strict=True):
             if text_style.size_pt is not None:
                 prev_font_size_pt = self.font_size_pt
                 self.font_size_pt = text_style.size_pt
+            # check if l_margin value is of type Align or string
+            align = Align.L
+            if isinstance(text_style.l_margin, (Align, str)):
+                align = text_style.l_margin
             page_break_triggered = self.multi_cell(
                 w=self.epw,
                 h=self.font_size,
@@ -5123,9 +5127,14 @@ def start_section(self, name, level=0, strict=True):
                 new_y=YPos.NEXT,
                 dry_run=True,  # => does not produce any output
                 output=MethodReturnValue.PAGE_BREAK,
+                align=align,
                 padding=Padding(
                     top=text_style.t_margin or 0,
-                    left=text_style.l_margin or 0,
+                    left=(
+                        text_style.l_margin
+                        if isinstance(text_style.l_margin, int)
+                        else 0
+                    ),
                     bottom=text_style.b_margin or 0,
                 ),
             )
@@ -5136,25 +5145,28 @@ def start_section(self, name, level=0, strict=True):
                 self.add_page()
             with self._marked_sequence(title=name) as struct_elem:
                 outline_struct_elem = struct_elem
-                with self._use_text_style(text_style):
+                with self._use_title_style(text_style):
                     self.multi_cell(
                         w=self.epw,
                         h=self.font_size,
                         text=name,
+                        align=align,
                         new_x=XPos.LMARGIN,
                         new_y=YPos.NEXT,
+                        center=text_style.l_margin == Align.C,
                     )
         self._outline.append(
             OutlineSection(name, level, self.page, dest, outline_struct_elem)
         )
 
     @contextmanager
-    def _use_text_style(self, text_style: TextStyle):
+    def _use_title_style(self, text_style: TextStyle):
         if text_style:
             if text_style.t_margin:
                 self.ln(text_style.t_margin)
             if text_style.l_margin:
-                self.set_x(text_style.l_margin)
+                if isinstance(text_style.l_margin, int):
+                    self.set_x(text_style.l_margin)
         with self.use_font_face(text_style):
             yield
         if text_style and text_style.b_margin:

test/outline/test_outline.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from fpdf import FPDF, TextStyle, TitleStyle, errors
+from fpdf import FPDF, TextStyle, TitleStyle, errors, Align
 
 from test.conftest import assert_pdf_equal
 
@@ -66,6 +66,32 @@ def test_incoherent_start_section_hierarchy():
         pdf.start_section("Subtitle", level=2)
 
 
+def test_start_section_horizontal_alignment(tmp_path):  # issue-1282
+
+    pdf = FPDF()
+    pdf.add_page()
+    pdf.set_font("Helvetica", "", 20)
+
+    # left align
+    level0 = TextStyle("Helvetica", "", 20, (0, 0, 0), l_margin=Align.L)
+    pdf.set_section_title_styles(level0)
+    pdf.start_section("left aligned section")
+
+    # center align
+    level0 = TextStyle("Helvetica", "", 20, (0, 0, 0), l_margin=Align.C)
+    pdf.set_section_title_styles(level0)
+    pdf.start_section("center aligned section")
+
+    # right align
+    level0 = TextStyle("Helvetica", "", 20, (0, 0, 0), l_margin=Align.R)
+    pdf.set_section_title_styles(level0)
+    pdf.start_section("right aligned section")
+
+    assert_pdf_equal(
+        pdf, HERE / "test_start_section_horizontal_alignment.pdf", tmp_path
+    )
+
+
 def test_set_section_title_styles_with_invalid_arg_type():
     pdf = FPDF()
     with pytest.raises(TypeError):