span refinements

src/textual/_compositor.py

@@ -15,7 +15,7 @@ from __future__ import annotations
 
 from operator import attrgetter, itemgetter
 import sys
-from typing import cast, Iterator, Iterable, NamedTuple, TYPE_CHECKING
+from typing import Callable, cast, Iterator, Iterable, NamedTuple, TYPE_CHECKING
 
 import rich.repr
 from rich.console import Console, ConsoleOptions, RenderResult, RenderableType
@@ -100,12 +100,15 @@ class SpansUpdate:
         self, console: Console, options: ConsoleOptions
     ) -> RenderResult:
         move_to = Control.move_to
-        for line, offset, segments in self.spans:
-            yield move_to(offset, line)
+        new_line = Segment.line()
+        for last, (y, x, segments) in loop_last(self.spans):
+            yield move_to(x, y)
             yield from segments
+            if not last:
+                yield new_line
 
     def __rich_repr__(self) -> rich.repr.Result:
-        yield [(y, offset, "...") for y, offset, segments in self.spans]
+        yield [(y, x, "...") for y, x, _segments in self.spans]
 
 
 @rich.repr.auto(angular=True)
@@ -161,7 +164,7 @@ class Compositor:
                 ranges.sort()
                 x1, x2 = ranges[0]
                 for next_x1, next_x2 in ranges[1:]:
-                    if next_x1 <= x2 + 1:
+                    if next_x1 <= x2:
                         if next_x2 > x2:
                             x2 = next_x2
                     else:
@@ -523,6 +526,7 @@ class Compositor:
             is_rendered_line = {y for y, _, _ in spans}.__contains__
         else:
             crop = screen_region
+            spans = []
             is_rendered_line = lambda y: True
 
         _Segment = Segment
@@ -566,34 +570,25 @@ class Compositor:
                     if chops_line[cut] is None:
                         chops_line[cut] = segments
 
-        # Assemble the cut renders in to lists of segments
+        if regions:
             crop_x, crop_y, crop_x2, crop_y2 = crop.corners
             render_lines = self._assemble_chops(chops[crop_y:crop_y2])
-
-        if regions:
-
             render_spans = [
-                (y, x1, line_crop(render_lines[y], x1, x2)) for y, x1, x2 in spans
+                (y, x1, line_crop(render_lines[y - crop_y], x1, x2))
+                for y, x1, x2 in spans
             ]
             return SpansUpdate(render_spans)
 
         else:
-            return SegmentLines(render_lines, new_lines=True)
-
-        if crop is not None and (crop_x, crop_x2) != (0, width):
-            render_lines = [
-                line_crop(line, crop_x, crop_x2) if line else line
-                for line in render_lines
-            ]
-
-        return SegmentLines(render_lines, new_lines=True)
+            render_lines = self._assemble_chops(chops)
+            return LayoutUpdate(render_lines, screen_region)
 
     def __rich_console__(
         self, console: Console, options: ConsoleOptions
     ) -> RenderResult:
         yield self.render()
 
-    def update_widgets(self, *widgets: Widget) -> RenderableType | None:
+    def update_widgets(self, widgets: set[Widget]) -> RenderableType | None:
         """Update a given widget in the composition.
 
         Args:
@@ -605,21 +600,13 @@ class Compositor:
         """
         regions: list[Region] = []
         add_region = regions.append
-        for widget in widgets:
-            if widget not in self.regions:
-                continue
+        for widget in self.regions.keys() & widgets:
             region, clip = self.regions[widget]
-            if not region:
-                continue
             update_region = region.intersection(clip)
-            if not update_region:
-                continue
+            if update_region:
                 add_region(update_region)
-
-        # print(regions)
+        print("UPDATE_WIDGET")
+        print(widgets)
+        print(regions)
         update = self.render(regions or None)
-        # print("UPDATE", update)
         return update
-        # update = LayoutUpdate(update_lines, total_region)
-        # # print(widgets, total_region)
-        # return update

src/textual/screen.py

@@ -97,8 +97,8 @@ class Screen(Widget):
 
         # Render widgets together
         if self._dirty_widgets:
-            self.log(dirty=len(self._dirty_widgets))
-            display_update = self._compositor.update_widgets(*self._dirty_widgets)
+            self.log(dirty=self._dirty_widgets)
+            display_update = self._compositor.update_widgets(self._dirty_widgets)
             if display_update is not None:
                 self.app.display(display_update)
             self._dirty_widgets.clear()
@@ -108,6 +108,9 @@ class Screen(Widget):
         """Refresh the layout (can change size and positions of widgets)."""
         if not self.size:
             return
+        # This paint the entire screen, so replaces the batched dirty widgets
+        self._update_timer.pause()
+        self._dirty_widgets.clear()
         try:
             hidden, shown, resized = self._compositor.reflow(self, self.size)
 
@@ -138,7 +141,6 @@ class Screen(Widget):
             self.app.on_exception(error)
             return
         self.app.refresh()
-        self._dirty_widgets.clear()
 
     async def handle_update(self, message: messages.Update) -> None:
         message.stop()

src/textual/scrollbar.py

@@ -227,9 +227,6 @@ class ScrollBar(Widget):
             style=style,
         )
 
-    async def on_event(self, event) -> None:
-        await super().on_event(event)
-
     async def on_enter(self, event: events.Enter) -> None:
         self.mouse_over = True
 

src/textual/widget.py

@@ -272,6 +272,8 @@ class Widget(DOMNode):
 
         self.show_horizontal_scrollbar = show_horizontal
         self.show_vertical_scrollbar = show_vertical
+        self.horizontal_scrollbar.display = show_horizontal
+        self.vertical_scrollbar.display = show_vertical
 
     @property
     def scrollbars_enabled(self) -> tuple[bool, bool]:
@@ -666,6 +668,7 @@ class Widget(DOMNode):
 
     def watch_mouse_over(self, value: bool) -> None:
         """Update from CSS if mouse over state changes."""
+        return
         self.app.update_styles()
 
     def watch_has_focus(self, value: bool) -> None:

tests/test_compositor_regions_to_spans.py

@@ -8,41 +8,47 @@ def test_regions_to_ranges_no_regions():
 
 def test_regions_to_ranges_single_region():
     regions = [Region(0, 0, 3, 2)]
-    assert list(Compositor._regions_to_spans(regions)) == [(0, 0, 2), (1, 0, 2)]
+    assert list(Compositor._regions_to_spans(regions)) == [
+        (0, 0, 3),
+        (1, 0, 3),
+    ]
 
 
 def test_regions_to_ranges_partially_overlapping_regions():
     regions = [Region(0, 0, 2, 2), Region(1, 1, 2, 2)]
     assert list(Compositor._regions_to_spans(regions)) == [
-        (0, 0, 1),
-        (1, 0, 2),
-        (2, 1, 2),
+        (0, 0, 2),
+        (1, 0, 3),
+        (2, 1, 3),
     ]
 
 
 def test_regions_to_ranges_fully_overlapping_regions():
     regions = [Region(1, 1, 3, 3), Region(2, 2, 1, 1), Region(0, 2, 3, 1)]
     assert list(Compositor._regions_to_spans(regions)) == [
-        (1, 1, 3),
-        (2, 0, 3),
-        (3, 1, 3),
+        (1, 1, 4),
+        (2, 0, 4),
+        (3, 1, 4),
     ]
 
 
 def test_regions_to_ranges_disjoint_regions_different_lines():
     regions = [Region(0, 0, 2, 1), Region(2, 2, 2, 1)]
-    assert list(Compositor._regions_to_spans(regions)) == [(0, 0, 1), (2, 2, 3)]
+    assert list(Compositor._regions_to_spans(regions)) == [(0, 0, 2), (2, 2, 4)]
 
 
 def test_regions_to_ranges_disjoint_regions_same_line():
     regions = [Region(0, 0, 1, 2), Region(2, 0, 1, 1)]
     assert list(Compositor._regions_to_spans(regions)) == [
-        (0, 0, 0),
-        (0, 2, 2),
-        (1, 0, 0),
+        (0, 0, 1),
+        (0, 2, 3),
+        (1, 0, 1),
     ]
 
 
 def test_regions_to_ranges_directly_adjacent_ranges_merged():
     regions = [Region(0, 0, 1, 2), Region(1, 0, 1, 2)]
-    assert list(Compositor._regions_to_spans(regions)) == [(0, 0, 1), (1, 0, 1)]
+    assert list(Compositor._regions_to_spans(regions)) == [
+        (0, 0, 2),
+        (1, 0, 2),
+    ]