refactor: enhance text handling by adding italic support and improving text registration in SlideBuilder

Author: ya7010

examples/color_text.py

@@ -22,9 +22,9 @@ def main():
                             lambda run: run.builder()
                             .text("Hello, world!")
                             .font(
-                                lambda font: font.builder().color(
-                                    lambda color: color.builder().rgb("#0000FF")
-                                )
+                                lambda font: font.builder()
+                                .color(lambda color: color.builder().rgb("#0000FF"))
+                                .italic(True)
                             )
                         )
                     ),

src/tppt/pptx/shape/text.py

@@ -39,7 +39,7 @@ class Text(Shape[PptxShape]):
     """Text data class."""
 
     def __init__(self, pptx_obj: PptxShape, data: TextData | None = None, /) -> None:
-        if data:
+        if data and data["text"] != "":
             text_frame = pptx_obj.text_frame
             p = text_frame.paragraphs[0]
             run = p.add_run()

src/tppt/pptx/slide.py

@@ -104,17 +104,17 @@ def text(
         text: str | Callable[[Text], Text | TextBuilder],
         **kwargs: Unpack[TextProps],
     ) -> Self:
-        data = TextData(
-            type="text",
-            text=text if isinstance(text, str) else "",
-            top=kwargs["top"],
-            left=kwargs["left"],
-            width=kwargs["width"],
-            height=kwargs["height"],
-        )
+        def _register(slide: Slide) -> Text:
+            data = TextData(
+                type="text",
+                text=text if isinstance(text, str) else "",
+                top=kwargs["top"],
+                left=kwargs["left"],
+                width=kwargs["width"],
+                height=kwargs["height"],
+            )
 
-        self._shape_registry.append(
-            lambda slide: Text(
+            text_obj = Text(
                 slide.to_pptx().shapes.add_textbox(
                     to_pptx_length(data["left"]),
                     to_pptx_length(data["top"]),
@@ -123,7 +123,15 @@ def text(
                 ),
                 data,
             )
-        )
+            if isinstance(text, Callable):
+                text_builder = text(text_obj)
+                if isinstance(text_builder, TextBuilder):
+                    text_builder = text_builder._build()
+                return text_builder
+            else:
+                return text_obj
+
+        self._shape_registry.append(_register)
 
         return self