fix missing images in paras

pyWebLayout/layout/ereader_manager.py

@@ -13,9 +13,11 @@ from pathlib import Path
 
 from .ereader_layout import RenderingPosition, ChapterNavigator, ChapterInfo
 from .page_buffer import BufferedPageRenderer
-from pyWebLayout.abstract.block import Block, HeadingLevel
+from pyWebLayout.abstract.block import Block, HeadingLevel, Image, BlockType
 from pyWebLayout.concrete.page import Page
+from pyWebLayout.concrete.image import RenderableImage
 from pyWebLayout.style.page_style import PageStyle
+from pyWebLayout.layout.document_layouter import image_layouter
 
 
 class BookmarkManager:
@@ -194,6 +196,10 @@ class EreaderLayoutManager:
         self.current_position = RenderingPosition()
         self.font_scale = 1.0
 
+        # Cover page handling
+        self._has_cover = self._detect_cover()
+        self._on_cover_page = self._has_cover  # Start on cover if one exists
+
         # Page position history for fast backward navigation
         # List of (position, font_scale) tuples representing the start of each page visited
         self._page_history: List[Tuple[RenderingPosition, float]] = []
@@ -203,6 +209,7 @@ class EreaderLayoutManager:
         saved_position = self.bookmark_manager.load_reading_position()
         if saved_position:
             self.current_position = saved_position
+            self._on_cover_page = False  # If we have a saved position, we're past the cover
 
         # Callbacks for UI updates
         self.position_changed_callback: Optional[Callable[[
@@ -220,6 +227,69 @@ class EreaderLayoutManager:
         """Set callback for chapter changes"""
         self.chapter_changed_callback = callback
 
+    def _detect_cover(self) -> bool:
+        """
+        Detect if the document has a cover page.
+
+        A cover is detected if:
+        1. The first block is an Image block, OR
+        2. The document has cover metadata (future enhancement)
+
+        Returns:
+            True if a cover page should be rendered
+        """
+        if not self.blocks:
+            return False
+
+        # Check if first block is an image - treat it as a cover
+        first_block = self.blocks[0]
+        if isinstance(first_block, Image):
+            return True
+
+        return False
+
+    def _render_cover_page(self) -> Page:
+        """
+        Render a dedicated cover page.
+
+        The cover page displays the first image block (if it exists)
+        using the standard image layouter with maximum dimensions to fill the page.
+
+        Returns:
+            Rendered cover page
+        """
+        # Create a new page for the cover
+        page = Page(self.page_size, self.page_style)
+
+        if not self.blocks or not isinstance(self.blocks[0], Image):
+            # No cover image, return blank page
+            return page
+
+        cover_image_block = self.blocks[0]
+
+        # Use the image layouter to render the cover image
+        # Use full page dimensions (minus borders/padding) for cover
+        try:
+            max_width = self.page_size[0] - 2 * self.page_style.border_width
+            max_height = self.page_size[1] - 2 * self.page_style.border_width
+
+            # Layout the image on the page
+            success = image_layouter(
+                image=cover_image_block,
+                page=page,
+                max_width=max_width,
+                max_height=max_height
+            )
+
+            if not success:
+                print("Warning: Failed to layout cover image")
+
+        except Exception as e:
+            # If image loading fails, just return the blank page
+            print(f"Warning: Failed to load cover image: {e}")
+
+        return page
+
     def _notify_position_changed(self):
         """Notify UI of position change"""
         if self.position_changed_callback:
@@ -238,9 +308,16 @@ class EreaderLayoutManager:
         """
         Get the page at the current reading position.
 
+        If on the cover page, returns the rendered cover.
+        Otherwise, returns the regular content page.
+
         Returns:
             Rendered page
         """
+        # Check if we're on the cover page
+        if self._on_cover_page and self._has_cover:
+            return self._render_cover_page()
+
         page, _ = self.renderer.render_page(self.current_position, self.font_scale)
         return page
 
@@ -248,9 +325,23 @@ class EreaderLayoutManager:
         """
         Advance to the next page.
 
+        If currently on the cover page, advances to the first content page.
+        Otherwise, advances to the next content page.
+
         Returns:
             Next page or None if at end of document
         """
+        # Special case: transitioning from cover to first content page
+        if self._on_cover_page and self._has_cover:
+            self._on_cover_page = False
+            # If first block is an image (the cover), skip it and start from block 1
+            if self.blocks and isinstance(self.blocks[0], Image):
+                self.current_position = RenderingPosition(chapter_index=0, block_index=1)
+            else:
+                self.current_position = RenderingPosition()
+            self._notify_position_changed()
+            return self.get_current_page()
+
         # Save current position to history before moving forward
         self._add_to_history(self.current_position, self.font_scale)
 
@@ -271,10 +362,21 @@ class EreaderLayoutManager:
 
         Uses cached page history for instant navigation when available,
         falls back to iterative refinement algorithm when needed.
+        Can navigate back to the cover page if it exists.
 
         Returns:
-            Previous page or None if at beginning of document
+            Previous page or None if at beginning of document (or on cover)
         """
+        # Special case: if at the beginning of content and there's a cover, go back to it
+        if self._has_cover and self._is_at_beginning() and not self._on_cover_page:
+            self._on_cover_page = True
+            self._notify_position_changed()
+            return self.get_current_page()
+
+        # Can't go before the cover
+        if self._on_cover_page:
+            return None
+
         if self._is_at_beginning():
             return None
 
@@ -303,9 +405,17 @@ class EreaderLayoutManager:
         return None  # At beginning of document
 
     def _is_at_beginning(self) -> bool:
-        """Check if we're at the beginning of the document"""
+        """
+        Check if we're at the beginning of the document content.
+
+        If a cover exists (first block is an Image), the beginning of content
+        is at block_index=1. Otherwise, it's at block_index=0.
+        """
+        # Determine the first content block index
+        first_content_block = 1 if (self._has_cover and self.blocks and isinstance(self.blocks[0], Image)) else 0
+
         return (self.current_position.chapter_index == 0 and
-                self.current_position.block_index == 0 and
+                self.current_position.block_index == first_content_block and
                 self.current_position.word_index == 0)
 
     def jump_to_position(self, position: RenderingPosition) -> Page:
@@ -319,6 +429,7 @@ class EreaderLayoutManager:
             Page at the new position
         """
         self.current_position = position
+        self._on_cover_page = False  # Jumping to a position means we're past the cover
         self._notify_position_changed()
         return self.get_current_page()
 
@@ -636,6 +747,38 @@ class EreaderLayoutManager:
 
         return current_block / max(1, total_blocks - 1)
 
+    def has_cover(self) -> bool:
+        """
+        Check if the document has a cover page.
+
+        Returns:
+            True if a cover page is available
+        """
+        return self._has_cover
+
+    def is_on_cover(self) -> bool:
+        """
+        Check if currently viewing the cover page.
+
+        Returns:
+            True if on the cover page
+        """
+        return self._on_cover_page
+
+    def jump_to_cover(self) -> Optional[Page]:
+        """
+        Jump to the cover page if one exists.
+
+        Returns:
+            Cover page or None if no cover exists
+        """
+        if not self._has_cover:
+            return None
+
+        self._on_cover_page = True
+        self._notify_position_changed()
+        return self.get_current_page()
+
     def get_position_info(self) -> Dict[str, Any]:
         """
         Get detailed information about the current position.
@@ -647,6 +790,8 @@ class EreaderLayoutManager:
 
         return {
             'position': self.current_position.to_dict(),
+            'on_cover': self._on_cover_page,
+            'has_cover': self._has_cover,
             'chapter': {
                 'title': current_chapter.title if current_chapter else None,
                 'level': current_chapter.level if current_chapter else None,