long placeholder

CHANGELOG.md

@@ -24,11 +24,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added `Screen.size` https://github.com/Textualize/textual/pull/6105
 - Added `compact` to Binding.Group https://github.com/Textualize/textual/pull/6132
 - Added `Screen.get_hover_widgets_at` https://github.com/Textualize/textual/pull/6132
+- Added `Content.wrap` https://github.com/Textualize/textual/pull/6138
 
 ### Fixed
 
 - Fixed issue where Segments with a style of `None` aren't rendered https://github.com/Textualize/textual/pull/6109
 - Fixed visual glitches and crash when changing `DataTable.header_height` https://github.com/Textualize/textual/pull/6128
+- Fixed TextArea.placeholder not handling multi-lines https://github.com/Textualize/textual/pull/6138
 
 ## [6.1.0] - 2025-08-01
 

src/textual/content.py

@@ -869,6 +869,26 @@ def iter_content() -> Iterable[Content]:
 
         return Content("".join(text), spans, total_cell_length)
 
+    def wrap(
+        self, width: int, *, align: TextAlign = "left", overflow: TextOverflow = "fold"
+    ) -> list[Content]:
+        """Wrap text so that it fits within the given dimensions.
+
+        Note that Textual will automatically wrap Content in widgets.
+        This method is only required if you need some additional processing to lines.
+
+        Args:
+            width: Maximum width of the line (in cells).
+            align: Alignment of lines.
+            overflow: Overflow of lines (what happens when the text doesn't fit).
+
+        Returns:
+            A list of Content objects, one per line.
+        """
+        lines = self._wrap_and_format(width, align, overflow)
+        content_lines = [line.content for line in lines]
+        return content_lines
+
     def get_style_at_offset(self, offset: int) -> Style:
         """Get the style of a character at give offset.
 

src/textual/widgets/_text_area.py

@@ -1206,24 +1206,24 @@ def render_line(self, y: int) -> Strip:
         Returns:
             A rendered line.
         """
-        if y == 0 and not self.text and self.placeholder:
-            style = self.get_visual_style("text-area--placeholder")
-            content = (
-                Content(self.placeholder)
-                if isinstance(self.placeholder, str)
-                else self.placeholder
-            )
-            content = content.stylize(style)
-            if self._draw_cursor:
-                theme = self._theme
-                cursor_style = theme.cursor_style if theme else None
-                if cursor_style:
-                    content = content.stylize(
-                        ContentStyle.from_rich_style(cursor_style), 0, 1
-                    )
-            return Strip(
-                content.render_segments(self.visual_style), content.cell_length
+
+        if not self.text and self.placeholder:
+            placeholder_lines = Content.from_text(self.placeholder).wrap(
+                self.content_size.width
             )
+            if y < len(placeholder_lines):
+                style = self.get_visual_style("text-area--placeholder")
+                content = placeholder_lines[y].stylize(style)
+                if self._draw_cursor and y == 0:
+                    theme = self._theme
+                    cursor_style = theme.cursor_style if theme else None
+                    if cursor_style:
+                        content = content.stylize(
+                            ContentStyle.from_rich_style(cursor_style), 0, 1
+                        )
+                return Strip(
+                    content.render_segments(self.visual_style), content.cell_length
+                )
 
         scroll_x, scroll_y = self.scroll_offset
         absolute_y = scroll_y + y