repaint regions

sandbox/will/basic.css

@@ -2,10 +2,10 @@
 
 
 
- * {
+ /* * {
     transition: color 300ms linear, background 300ms linear;
 } 
-
+ */
 
 *:hover {
   /* tint: 30% red;  

src/textual/_compositor.py

@@ -609,6 +609,7 @@ class Compositor:
         Returns:
             SegmentLines: A renderable
         """
+
         width, height = self.size
         screen_region = Region(0, 0, width, height)
 
@@ -706,7 +707,7 @@ class Compositor:
             region, clip = self.regions[widget]
             offset = region.offset
             intersection = clip.intersection
-            for dirty_region in widget.get_dirty_regions():
+            for dirty_region in widget._exchange_repaint_regions():
                 update_region = intersection(dirty_region.translate(offset))
                 if update_region:
                     add_region(update_region)

src/textual/scroll_view.py

@@ -40,16 +40,6 @@ class ScrollView(Widget):
         """Not transparent, i.e. renders something."""
         return False
 
-    def get_dirty_regions(self) -> Collection[Region]:
-        """Get regions which require a repaint.
-
-        Returns:
-            Collection[Region]: Regions to repaint.
-        """
-        regions = self._dirty_regions.copy()
-        self._dirty_regions.clear()
-        return regions
-
     def on_mount(self):
         self._refresh_scrollbars()
 

src/textual/widget.py

@@ -106,7 +106,10 @@ class Widget(DOMNode):
         self._horizontal_scrollbar: ScrollBar | None = None
 
         self._render_cache = RenderCache(Size(0, 0), [])
+        # Regions which need to be updated (in Widget)
         self._dirty_regions: set[Region] = set()
+        # Regions which need to be transferred from cache to screen
+        self._repaint_regions: set[Region] = set()
 
         # Cache the auto content dimensions
         # TODO: add mechanism to explicitly clear this
@@ -549,24 +552,27 @@ class Widget(DOMNode):
             *regions (Region): Regions which require a repaint.
 
         """
-
         if regions:
             content_offset = self.content_offset
             widget_regions = [region.translate(content_offset) for region in regions]
             self._dirty_regions.update(widget_regions)
+            self._repaint_regions.update(widget_regions)
             self._styles_cache.set_dirty(*widget_regions)
         else:
             self._dirty_regions.clear()
+            self._repaint_regions.clear()
             self._styles_cache.clear()
             self._dirty_regions.add(self.outer_size.region)
+            self._repaint_regions.add(self.outer_size.region)
 
-    def get_dirty_regions(self) -> Collection[Region]:
-        """Get regions which require a repaint.
+    def _exchange_repaint_regions(self) -> Collection[Region]:
+        """Get a copy of the regions which need a repaint, and clear internal cache.
 
         Returns:
             Collection[Region]: Regions to repaint.
         """
-        regions = self._dirty_regions.copy()
+        regions = self._repaint_regions.copy()
+        self._repaint_regions.clear()
         return regions
 
     def scroll_to(
@@ -956,10 +962,10 @@ class Widget(DOMNode):
         """Render the widget in to lines.
 
         Args:
-            crop (Region): Region within visible area to.
+            crop (Region): Region within visible area to render.
 
         Returns:
-            Lines: A list of list of segments
+            Lines: A list of list of segments.
         """
         lines = self._styles_cache.render_widget(self, crop)
         return lines