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173 | from typing import TYPE_CHECKING
from ..boxtree.boxitem import BoxItem
from ..boxtree.lazy import LazyValue
from ..render.backends.backend import Backend
from .textparser import extract_line, number_of_lines
if TYPE_CHECKING:
from ..boxtree import box
def text_x_in_rect(rect, style):
align = style.align
if align == "left":
return rect.x
elif align == "middle":
return rect.x + rect.width / 2
elif align == "right":
return rect.x + rect.width
else:
raise Exception("Invalid value of align: " + repr(align))
class TextBoxItem(BoxItem):
def __init__(self, box, parsed_text, style, styles, scale_to_fit, rotation):
super().__init__(box)
self._text_size = None
self._text_scale = 1
self._scale_to_fit = scale_to_fit
self.rotation = rotation
self._style = style
self._styles = styles
self._parsed_text = parsed_text
self._make_query(box.slide.slides.backend)
if scale_to_fit:
def callback(rect):
tw, th = self._text_size
if tw > 0.00001 and th > 0.00001:
scale = min(rect.width / tw, rect.height / th)
self._text_size = (tw * scale, th * scale)
self._text_scale = scale
box.layout.add_callback(callback)
def render(self, ctx):
rect = self._box.layout.rect
scale = self._text_scale
style = self._style
x = text_x_in_rect(rect, style)
y = rect.y + (rect.height - self._text_size[1]) / 2 + style.size * scale
if scale > 0.00001:
ctx.draw_text(
rect=rect,
x=x,
y=y,
parsed_text=self._parsed_text,
style=style,
styles=self._styles,
scale=scale if self._scale_to_fit else None,
rotation=self.rotation,
)
def _make_query(self, backend: Backend):
width = backend.compute_text_width(self._parsed_text, self._style, self._styles)
layout = self._box.layout
style = self._style
line_height = style.size * style.line_spacing
height = number_of_lines(self._parsed_text) * line_height
if not self._scale_to_fit:
layout.ensure_width(width)
layout.ensure_height(height)
else:
if layout.width_definition is None:
layout.ensure_width(width)
if layout.height_definition is None:
layout.ensure_height(height)
self._text_size = (width, height)
def line_box(self, index: int, n_lines=1, **box_args) -> "box.Box":
"""
Creates a box that wraps the specified number of lines starting at `index`.
Parameters
----------
index: int
Index of the first line.
n_lines: int
Number of items that will be included in the box.
box_args
Parameters passed to the Box constructor.
"""
def compute_y():
text_lines = number_of_lines(self._parsed_text)
line_height = self._text_size[1] / text_lines
rect = self._box.layout.rect
y = rect.y + (rect.height - self._text_size[1]) / 2
return y + line_height * index
def compute_height():
text_lines = number_of_lines(self._parsed_text)
return n_lines * self._text_size[1] / text_lines + 1
box_args.setdefault("width", "fill")
box_args.setdefault("x", 0)
box_args.setdefault("y", LazyValue(compute_y))
box_args.setdefault("height", LazyValue(compute_height))
return self._box.box(**box_args)
def inline_box(self, style_name, n_th=1, **box_args) -> "box.Box":
"""
Creates a box that will wrap a section of text which is enclosed by the given inline style.
Parameters
----------
style_name: str
Name of the (inline) style that should be found inside the text.
n_th: int
If there are multiple instances of the passed inline style, this parameter selects
which instance should be wrapped with the newly created box.
box_args
Parameters passed to the Box constructor.
"""
assert n_th > 0
count = n_th
for (i, token) in enumerate(self._parsed_text):
if token[0] == "begin" and token[1] == style_name:
count -= 1
if count == 0:
return self._text_box_helper(i, box_args)
raise Exception(
"Style {}. occurence of style '{}' not found".format(n_th, style_name)
)
def _text_box_helper(self, index, box_args):
def compute_y():
line_number = number_of_lines(self._parsed_text[:index]) - 1
text_lines = number_of_lines(self._parsed_text)
line_height = self._text_size[1] / text_lines
rect = self._box.layout.rect
y = rect.y + (rect.height - self._text_size[1]) / 2
return y + line_height * line_number
def compute_height():
text_lines = number_of_lines(self._parsed_text)
return self._text_size[1] / text_lines + 1
line, index_in_line = extract_line(self._parsed_text, index)
backend = self._box.slide.slides.backend
query_x = backend.compute_text_x(
line, self._style, self._styles, id_index=index_in_line
)
query_w = backend.compute_text_width(
line, self._style, self._styles, id_index=index_in_line
)
box_args.setdefault(
"x",
LazyValue(
lambda: text_x_in_rect(self._box.layout.rect, self._style)
+ query_x * self._text_scale
),
)
box_args.setdefault("y", LazyValue(compute_y))
box_args.setdefault("width", LazyValue(lambda: query_w * self._text_scale))
box_args.setdefault("height", LazyValue(compute_height))
return self._box.box(**box_args)
|