allow select

Author: willmcgugan

CHANGELOG.md

@@ -23,6 +23,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added `Widget.scrollable_container` property
 - Added `Widget.select_all`
 - Added `Region.bottom_right_inclusive`
+- Added double click to select, triple click to select all in container
+- Added arbitrary text selection
+- Added Widget.ALLOW_SELECT classvar for a per-widget switch to disable text selection
+- Added Widget.allow_select method for programmatic control of text selection
+- Added App.ALLOW_SELECT for a global switch to disable text selection
 
 ### Fixed
 

src/textual/app.py

@@ -396,6 +396,12 @@ class MyApp(App[None]):
     Setting to `None` or `""` disables auto focus.
     """
 
+    ALLOW_SELECT: ClassVar[bool] = True
+    """A switch to toggle arbitrary text selection for the app.
+    
+    Note that this doesn't apply to Input and TextArea which have builtin support for selection.
+    """
+
     _BASE_PATH: str | None = None
     CSS_PATH: ClassVar[CSSPathType | None] = None
     """File paths to load CSS from."""

src/textual/screen.py

@@ -511,6 +511,11 @@ def is_active(self) -> bool:
         except Exception:
             return False
 
+    @property
+    def allow_select(self) -> bool:
+        """Check if this widget permits text selection."""
+        return self.ALLOW_SELECT
+
     def render(self) -> RenderableType:
         """Render method inherited from widget, used to render the screen's background.
 
@@ -1520,7 +1525,12 @@ def _forward_event(self, event: events.Event) -> None:
                 select_widget, select_offset = self.get_widget_and_offset_at(
                     event.screen_x, event.screen_y
                 )
-                if select_widget is not None and select_widget.allow_select:
+                if (
+                    select_widget is not None
+                    and select_widget.allow_select
+                    and self.screen.allow_select
+                    and self.app.ALLOW_SELECT
+                ):
                     self._selecting = True
                     if select_widget is not None and select_offset is not None:
                         self._select_start = (