Implement tiling vs centering wallpaper

README.md

@@ -197,7 +197,6 @@ To preview ANSI art files in file managers like Nautilus, Thunar, Nemo, or Caja,
 - Free-Form Select stamping/finalizing is incorrect when the selection is off-screen to the left or top.
 - Status bar description can be left blank when selecting a menu item. (I think the `Leave` event can come after closing, once the mouse moves.)
 - Menu items like Copy/Cut/Paste are not grayed out when inapplicable. Only unimplemented items are grayed out.
-- Set As Wallpaper (Tiled) acts the same as Set As Wallpaper (Centered).
 - ANSI files (.ans) are treated as UTF-8 when saving and loading, rather than CP437 or Windows-1252 or any other encodings. Unicode is nice and modern terminals support it, but it's not the standard for ANSI files. There isn't really a standard for ANSI files.
 - ANSI files are loaded with a white background. This may make sense as a default for text files, but ANSI files either draw a background or assume a black background, being designed for terminals.
 - Hitting Enter in View Bitmap mode exits the mode but may also trigger a menu item. Menu items ought to be disabled when hidden, and View Bitmap should prevent the key event from taking other actions if possible.

src/textual_paint/paint.py

@@ -3555,10 +3555,12 @@ Columns: {len(palette) // 2}
         self.message_box(_("Paint"), "Not implemented.", "ok")
     
     def action_set_as_wallpaper_tiled(self) -> None:
-        """Set the image as the wallpaper."""
-        # TODO: Differentiate between tiled and centered.
-        self.action_set_as_wallpaper_centered()
+        """Tile the image as the wallpaper."""
+        self.set_as_wallpaper(tiled=True)
     def action_set_as_wallpaper_centered(self) -> None:
+        """Center the image as the wallpaper."""
+        self.set_as_wallpaper(tiled=False)
+    def set_as_wallpaper(self, tiled: bool) -> None:
         """Set the image as the wallpaper."""
         try:
             dir = os.path.join(get_config_dir("textual-paint"), "wallpaper")
@@ -3568,12 +3570,27 @@ Columns: {len(palette) // 2}
             # with open(image_path, "w", encoding="utf-8") as f:
             #     f.write(svg)
             image_path = os.path.join(dir, "wallpaper.png")
-            pil_image = rasterize(self.image)
-            pil_image.save(image_path)
+            screen_size = self.get_screen_size()
+            im = rasterize(self.image)
+            im_w, im_h = im.size
+            if tiled:
+                new_im = Image.new('RGBA', screen_size)
+                w, h = new_im.size
+                for i in range(0, w, im_w):
+                    for j in range(0, h, im_h):
+                        new_im.paste(im, (i, j))
+            else:
+                new_im = Image.new('RGBA', screen_size)
+                w, h = new_im.size
+                new_im.paste(im, (w//2 - im_w//2, h//2 - im_h//2))
+            new_im.save(image_path)
             set_wallpaper(image_path)
         except Exception as e:
             self.message_box(_("Paint"), _("Failed to set the wallpaper."), "ok", error=e)
-    
+    def get_screen_size(self) -> tuple[int, int]:
+        """Get the screen size."""
+        return 1920, 1080 # TODO: get the actual screen size
+
     def action_recent_file(self) -> None:
         self.message_box(_("Paint"), "Not implemented.", "ok")