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from abc import ABC, abstractmethod from itertools import islice from operator import itemgetter from threading import RLock from typing import ( TYPE_CHECKING, Dict, Iterable, List, NamedTuple, Optional, Sequence, Tuple, Union, ) from ._ratio import ratio_resolve from .align import Align from .console import Console, ConsoleOptions, RenderableType, RenderResult from .highlighter import ReprHighlighter from .panel import Panel from .pretty import Pretty from .region import Region from .repr import Result, rich_repr from .segment import Segment from .style import StyleType if TYPE_CHECKING: from rich.tree import Tree class LayoutRender(NamedTuple): """An individual layout render.""" region: Region render: List[List[Segment]] RegionMap = Dict["Layout", Region] RenderMap = Dict["Layout", LayoutRender] class LayoutError(Exception): """Layout related error.""" class NoSplitter(LayoutError): """Requested splitter does not exist.""" class _Placeholder: """An internal renderable used as a Layout placeholder.""" highlighter = ReprHighlighter() def __init__(self, layout: "Layout", style: StyleType = "") -> None: self.layout = layout self.style = style def __rich_console__( self, console: Console, options: ConsoleOptions ) -> RenderResult: width = options.max_width height = options.height or options.size.height layout = self.layout title = ( f"{layout.name!r} ({width} x {height})" if layout.name else f"({width} x {height})" ) yield Panel( Align.center(Pretty(layout), vertical="middle"), style=self.style, title=self.highlighter(title), border_style="blue", height=height, ) class Splitter(ABC): """Base class for a splitter.""" name: str = "" @abstractmethod def get_tree_icon(self) -> str: """Get the icon (emoji) used in layout.tree""" @abstractmethod def divide( self, children: Sequence["Layout"], region: Region ) -> Iterable[Tuple["Layout", Region]]: """Divide a region amongst several child layouts. Args: children (Sequence(Layout)): A number of child layouts. region (Region): A rectangular region to divide. """ class RowSplitter(Splitter): """Split a layout region in to rows.""" name = "row" def get_tree_icon(self) -> str: return "[layout.tree.row]⬌" def divide( self, children: Sequence["Layout"], region: Region ) -> Iterable[Tuple["Layout", Region]]: x, y, width, height = region render_widths = ratio_resolve(width, children) offset = 0 _Region = Region for child, child_width in zip(children, render_widths): yield child, _Region(x + offset, y, child_width, height) offset += child_width class ColumnSplitter(Splitter): """Split a layout region in to columns.""" name = "column" def get_tree_icon(self) -> str: return "[layout.tree.column]⬍" def divide( self, children: Sequence["Layout"], region: Region ) -> Iterable[Tuple["Layout", Region]]: x, y, width, height = region render_heights = ratio_resolve(height, children) offset = 0 _Region = Region for child, child_height in zip(children, render_heights): yield child, _Region(x, y + offset, width, child_height) offset += child_height @rich_repr class Layout: """A renderable to divide a fixed height in to rows or columns. Args: renderable (RenderableType, optional): Renderable content, or None for placeholder. Defaults to None. name (str, optional): Optional identifier for Layout. Defaults to None. size (int, optional): Optional fixed size of layout. Defaults to None. minimum_size (int, optional): Minimum size of layout. Defaults to 1. ratio (int, optional): Optional ratio for flexible layout. Defaults to 1. visible (bool, optional): Visibility of layout. Defaults to True. """ splitters = {"row": RowSplitter, "column": ColumnSplitter} def __init__( self, renderable: Optional[RenderableType] = None, *, name: Optional[str] = None, size: Optional[int] = None, minimum_size: int = 1, ratio: int = 1, visible: bool = True, ) -> None: self._renderable = renderable or _Placeholder(self) self.size = size self.minimum_size = minimum_size self.ratio = ratio self.name = name self.visible = visible self.splitter: Splitter = self.splitters["column"]() self._children: List[Layout] = [] self._render_map: RenderMap = {} self._lock = RLock() def __rich_repr__(self) -> Result: yield "name", self.name, None yield "size", self.size, None yield "minimum_size", self.minimum_size, 1 yield "ratio", self.ratio, 1 @property def renderable(self) -> RenderableType: """Layout renderable.""" return self if self._children else self._renderable @property def children(self) -> List["Layout"]: """Gets (visible) layout children.""" return [child for child in self._children if child.visible] @property def map(self) -> RenderMap: """Get a map of the last render.""" return self._render_map def get(self, name: str) -> Optional["Layout"]: """Get a named layout, or None if it doesn't exist. Args: name (str): Name of layout. Returns: Optional[Layout]: Layout instance or None if no layout was found. """ if self.name == name: return self else: for child in self._children: named_layout = child.get(name) if named_layout is not None: return named_layout return None def __getitem__(self, name: str) -> "Layout": layout = self.get(name) if layout is None: raise KeyError(f"No layout with name {name!r}") return layout @property def tree(self) -> "Tree": """Get a tree renderable to show layout structure.""" from rich.styled import Styled from rich.table import Table from rich.tree import Tree def summary(layout: "Layout") -> Table: icon = layout.splitter.get_tree_icon() table = Table.grid(padding=(0, 1, 0, 0)) text: RenderableType = ( Pretty(layout) if layout.visible else Styled(Pretty(layout), "dim") ) table.add_row(icon, text) _summary = table return _summary layout = self tree = Tree( summary(layout), guide_style=f"layout.tree.{layout.splitter.name}", highlight=True, ) def recurse(tree: "Tree", layout: "Layout") -> None: for child in layout._children: recurse( tree.add( summary(child), guide_style=f"layout.tree.{child.splitter.name}", ), child, ) recurse(tree, self) return tree def split( self, *layouts: Union["Layout", RenderableType], splitter: Union[Splitter, str] = "column", ) -> None: """Split the layout in to multiple sub-layouts. Args: *layouts (Layout): Positional arguments should be (sub) Layout instances. splitter (Union[Splitter, str]): Splitter instance or name of splitter. """ _layouts = [ layout if isinstance(layout, Layout) else Layout(layout) for layout in layouts ] try: self.splitter = ( splitter if isinstance(splitter, Splitter) else self.splitters[splitter]() ) except KeyError: raise NoSplitter(f"No splitter called {splitter!r}") self._children[:] = _layouts def add_split(self, *layouts: Union["Layout", RenderableType]) -> None: """Add a new layout(s) to existing split. Args: *layouts (Union[Layout, RenderableType]): Positional arguments should be renderables or (sub) Layout instances. """ _layouts = ( layout if isinstance(layout, Layout) else Layout(layout) for layout in layouts ) self._children.extend(_layouts) def split_row(self, *layouts: Union["Layout", RenderableType]) -> None: """Split the layout in to a row (layouts side by side). Args: *layouts (Layout): Positional arguments should be (sub) Layout instances. """ self.split(*layouts, splitter="row") def split_column(self, *layouts: Union["Layout", RenderableType]) -> None: """Split the layout in to a column (layouts stacked on top of each other). Args: *layouts (Layout): Positional arguments should be (sub) Layout instances. """ self.split(*layouts, splitter="column") def unsplit(self) -> None: """Reset splits to initial state.""" del self._children[:] def update(self, renderable: RenderableType) -> None: """Update renderable. Args: renderable (RenderableType): New renderable object. """ with self._lock: self._renderable = renderable def refresh_screen(self, console: "Console", layout_name: str) -> None: """Refresh a sub-layout. Args: console (Console): Console instance where Layout is to be rendered. layout_name (str): Name of layout. """ with self._lock: layout = self[layout_name] region, _lines = self._render_map[layout] (x, y, width, height) = region lines = console.render_lines( layout, console.options.update_dimensions(width, height) ) self._render_map[layout] = LayoutRender(region, lines) console.update_screen_lines(lines, x, y) def _make_region_map(self, width: int, height: int) -> RegionMap: """Create a dict that maps layout on to Region.""" stack: List[Tuple[Layout, Region]] = [(self, Region(0, 0, width, height))] push = stack.append pop = stack.pop layout_regions: List[Tuple[Layout, Region]] = [] append_layout_region = layout_regions.append while stack: append_layout_region(pop()) layout, region = layout_regions[-1] children = layout.children if children: for child_and_region in layout.splitter.divide(children, region): push(child_and_region) region_map = { layout: region for layout, region in sorted(layout_regions, key=itemgetter(1)) } return region_map def render(self, console: Console, options: ConsoleOptions) -> RenderMap: """Render the sub_layouts. Args: console (Console): Console instance. options (ConsoleOptions): Console options. Returns: RenderMap: A dict that maps Layout on to a tuple of Region, lines """ render_width = options.max_width render_height = options.height or console.height region_map = self._make_region_map(render_width, render_height) layout_regions = [ (layout, region) for layout, region in region_map.items() if not layout.children ] render_map: Dict["Layout", "LayoutRender"] = {} render_lines = console.render_lines update_dimensions = options.update_dimensions for layout, region in layout_regions: lines = render_lines( layout.renderable, update_dimensions(region.width, region.height) ) render_map[layout] = LayoutRender(region, lines) return render_map def __rich_console__( self, console: Console, options: ConsoleOptions ) -> RenderResult: with self._lock: width = options.max_width or console.width height = options.height or console.height render_map = self.render(console, options.update_dimensions(width, height)) self._render_map = render_map layout_lines: List[List[Segment]] = [[] for _ in range(height)] _islice = islice for region, lines in render_map.values(): _x, y, _layout_width, layout_height = region for row, line in zip( _islice(layout_lines, y, y + layout_height), lines ): row.extend(line) new_line = Segment.line() for layout_row in layout_lines: yield from layout_row yield new_line if __name__ == "__main__": from rich.console import Console console = Console() layout = Layout() layout.split_column( Layout(name="header", size=3), Layout(ratio=1, name="main"), Layout(size=10, name="footer"), ) layout["main"].split_row(Layout(name="side"), Layout(name="body", ratio=2)) layout["body"].split_row(Layout(name="content", ratio=2), Layout(name="s2")) layout["s2"].split_column( Layout(name="top"), Layout(name="middle"), Layout(name="bottom") ) layout["side"].split_column(Layout(layout.tree, name="left1"), Layout(name="left2")) layout["content"].update("foo") console.print(layout)