fix for simple case

docs/examples/introduction/intro02.py

@@ -3,10 +3,6 @@ from textual.app import App
 
 class ExampleApp(App):
 
-    CSS = """
-
-    """
-
     COLORS = [
         "white",
         "maroon",
@@ -22,15 +18,12 @@ class ExampleApp(App):
 
     def on_mount(self):
         self.styles.background = "darkblue"
-        self.bind("t", "tree")
 
     def on_key(self, event):
         if event.key.isdigit():
             self.styles.background = self.COLORS[int(event.key)]
         self.bell()
 
-    def action_tree(self):
-        self.log(self.tree)
 
 app = ExampleApp()
 app.run()

docs/examples/styles/width.py

@@ -5,7 +5,7 @@ from textual.widget import Widget
 class WidthApp(App):
     CSS = """    
     Widget {     
-        background: blue;
+        background: blue 50%;
         width: 50%;
     }
     """

sandbox/nest.py

@@ -12,7 +12,7 @@ TEXT = Text.from_markup(lorem)
 
 
 class TextWidget(Widget):
-    def render(self, style):
+    def render(self):
         return TEXT
 
 

src/textual/_compositor.py

@@ -221,7 +221,7 @@ class Compositor:
         # Keep a copy of the old map because we're going to compare it with the update
         old_map = self.map.copy()
         old_widgets = old_map.keys()
-        map, widgets = self._arrange_root(parent)
+        map, widgets = self._arrange_root(parent, size)
 
         # parent.log(map)
 
@@ -246,17 +246,16 @@ class Compositor:
         resized_widgets = {
             widget
             for widget, (region, *_) in map.items()
-            if widget in old_widgets and widget.size != region.size
+            if widget in old_widgets and old_map[widget].region.size != region.size
         }
 
         # Gets pairs of tuples of (Widget, MapGeometry) which have changed
         # i.e. if something is moved / deleted / added
         screen = size.region
+
         if screen not in self._dirty_regions:
             crop_screen = screen.intersection
-            changes: set[tuple[Widget, MapGeometry]] = (
-                self.map.items() ^ old_map.items()
-            )
+            changes = map.items() ^ old_map.items()
             self._dirty_regions.update(
                 [
                     crop_screen(map_geometry.visible_region)
@@ -270,7 +269,9 @@ class Compositor:
             resized=resized_widgets,
         )
 
-    def _arrange_root(self, root: Widget) -> tuple[CompositorMap, set[Widget]]:
+    def _arrange_root(
+        self, root: Widget, size: Size
+    ) -> tuple[CompositorMap, set[Widget]]:
         """Arrange a widgets children based on its layout attribute.
 
         Args:
@@ -282,7 +283,7 @@ class Compositor:
         """
 
         ORIGIN = Offset(0, 0)
-        size = root.size
+
         map: CompositorMap = {}
         widgets: set[Widget] = set()
         get_order = attrgetter("order")

src/textual/app.py

@@ -526,7 +526,7 @@ class App(Generic[ReturnType], DOMNode):
                 self.screen.refresh(layout=True)
 
     def render(self) -> RenderableType:
-        return Blank("red")
+        return Blank()
 
     def query(self, selector: str | None = None) -> DOMQuery:
         """Get a DOM query in the current screen.
@@ -737,6 +737,7 @@ class App(Generic[ReturnType], DOMNode):
 
             driver = self._driver = self.driver_class(self.console, self)
             driver.start_application_mode()
+            with redirect_stdout(StdoutRedirector(self.devtools, self._log_file)):  # type: ignore
                 try:
                     mount_event = events.Mount(sender=self)
                     await self.dispatch_message(mount_event)
@@ -745,8 +746,6 @@ class App(Generic[ReturnType], DOMNode):
                     self.stylesheet.update(self)
                     self.refresh()
                     await self.animator.start()
-
-                with redirect_stdout(StdoutRedirector(self.devtools, self._log_file)):  # type: ignore
                     await self._ready()
                     await super().process_messages()
                     await self.animator.stop()
@@ -872,7 +871,11 @@ class App(Generic[ReturnType], DOMNode):
         await self.close_messages()
 
     def refresh(self, *, repaint: bool = True, layout: bool = False) -> None:
-        self._display(self.screen._compositor)
+        self.screen.refresh(repaint=repaint, layout=layout)
+        # self._display(self.screen._compositor.render())
+
+    def _paint(self):
+        self._display(self.screen._compositor.render())
 
     def refresh_css(self, animate: bool = True) -> None:
         """Refresh CSS.
@@ -1052,11 +1055,11 @@ class App(Generic[ReturnType], DOMNode):
 
     async def handle_update(self, message: messages.Update) -> None:
         message.stop()
-        self.app.refresh()
+        self._paint()
 
     async def handle_layout(self, message: messages.Layout) -> None:
         message.stop()
-        self.app.refresh()
+        self._paint()
 
     async def on_key(self, event: events.Key) -> None:
         if event.key == "tab":
@@ -1071,6 +1074,9 @@ class App(Generic[ReturnType], DOMNode):
         await self.close_messages()
 
     async def on_resize(self, event: events.Resize) -> None:
+        event.stop()
+        self.screen._screen_resized(event.size)
+
         await self.screen.post_message(event)
 
     async def action_press(self, key: str) -> None:

src/textual/css/styles.py

@@ -476,7 +476,6 @@ class Styles(StylesBase):
         return self._rules.get(rule, default)
 
     def refresh(self, *, layout: bool = False) -> None:
-        print(self, self.node, "REFRESH", layout)
         if self.node is not None:
             self.node.refresh(layout=layout)
 

src/textual/renderables/blank.py

@@ -11,12 +11,12 @@ class Blank:
     """Draw solid background color."""
 
     def __init__(self, color: Color | str = "transparent") -> None:
-        background = (
-            color.rich_color
-            if isinstance(color, Color)
-            else Color.parse(color).rich_color
+        background = color if isinstance(color, Color) else Color.parse(color)
+        self._style = (
+            Style()
+            if background.is_transparent
+            else Style.from_color(None, background.rich_color)
         )
-        self._style = Style.from_color(None, background)
 
     def __rich_console__(
         self, console: Console, options: ConsoleOptions

src/textual/screen.py

@@ -9,9 +9,11 @@ from rich.style import Style
 
 from . import events, messages, errors
 
-from .geometry import Offset, Region
+from .color import Color
+from .geometry import Offset, Region, Size
 from ._compositor import Compositor, MapGeometry
 from .reactive import Reactive
+from .renderables.blank import Blank
 from .widget import Widget
 
 if sys.version_info >= (3, 8):
@@ -31,10 +33,6 @@ class Screen(Widget):
     Screen {
         layout: vertical;
         overflow-y: auto;
-        /*
-        background: $surface;
-        color: $text-surface;
-        */
     }
     """
 
@@ -45,11 +43,15 @@ class Screen(Widget):
         self._compositor = Compositor()
         self._dirty_widgets: set[Widget] = set()
 
+    @property
+    def is_transparent(self) -> bool:
+        return False
+
     def watch_dark(self, dark: bool) -> None:
         pass
 
     def render(self) -> RenderableType:
-        return self.app.render()
+        return Blank()
 
     def get_offset(self, widget: Widget) -> Offset:
         """Get the absolute offset of a given Widget.
@@ -114,15 +116,16 @@ class Screen(Widget):
             self._dirty_widgets.clear()
         self._update_timer.pause()
 
-    def _refresh_layout(self) -> None:
+    def _refresh_layout(self, size: Size | None = None, full: bool = False) -> None:
         """Refresh the layout (can change size and positions of widgets)."""
-        if not self.size:
+        size = self.size if size is None else size
+        if not size:
             return
-        # This paint the entire screen, so replaces the batched dirty widgets
+
         self._compositor.update_widgets(self._dirty_widgets)
         self._update_timer.pause()
         try:
-            hidden, shown, resized = self._compositor.reflow(self, self.size)
+            hidden, shown, resized = self._compositor.reflow(self, size)
 
             Hide = events.Hide
             Show = events.Show
@@ -131,6 +134,7 @@ class Screen(Widget):
             for widget in shown:
                 widget.post_message_no_wait(Show(self))
 
+            # We want to send a resize event to widgets that were just added or change since last layout
             send_resize = shown | resized
 
             for (
@@ -151,7 +155,7 @@ class Screen(Widget):
             self.app.on_exception(error)
             return
 
-        display_update = self._compositor.render()
+        display_update = self._compositor.render(full=full)
         if display_update is not None:
             self.app._display(display_update)
 
@@ -172,9 +176,13 @@ class Screen(Widget):
             UPDATE_PERIOD, self._on_update, name="screen_update", pause=True
         )
 
+    def _screen_resized(self, size: Size):
+        self._refresh_layout(size, full=True)
+
     async def on_resize(self, event: events.Resize) -> None:
-        self.size_updated(event.size, event.virtual_size, event.container_size)
         event.stop()
+        # self._size = event.size
+        # self._refresh_layout(event.size, full=True)
 
     async def _on_mouse_move(self, event: events.MouseMove) -> None:
         try:

src/textual/widget.py

@@ -769,7 +769,6 @@ class Widget(DOMNode):
             self._size = size
             self._virtual_size = virtual_size
             self._container_size = container_size
-
             if self.is_container:
                 self._refresh_scrollbars()
                 width, height = self.container_size