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