"""
==================
Scheme Annotations
==================
"""
from AnyQt.QtCore import QObject
from AnyQt.QtCore import pyqtSignal as Signal, pyqtProperty as Property
from ..utils import check_type
[docs]class BaseSchemeAnnotation(QObject):
"""
Base class for scheme annotations.
"""
# Signal emitted when the geometry of the annotation changes
geometry_changed = Signal()
[docs]class SchemeArrowAnnotation(BaseSchemeAnnotation):
"""
An arrow annotation in the scheme.
"""
color_changed = Signal(str)
def __init__(self, start_pos, end_pos, color="red", anchor=None,
parent=None):
super().__init__(parent)
self.__start_pos = start_pos
self.__end_pos = end_pos
self.__color = color
self.__anchor = anchor
[docs] def set_line(self, start_pos, end_pos):
"""
Set arrow lines start and end position (``(x, y)`` tuples).
"""
if self.__start_pos != start_pos or self.__end_pos != end_pos:
self.__start_pos = start_pos
self.__end_pos = end_pos
self.geometry_changed.emit()
def start_pos(self):
"""
Start position of the arrow (base point).
"""
return self.__start_pos
start_pos = Property(tuple, fget=start_pos)
def end_pos(self):
"""
End position of the arrow (arrow head points toward the end).
"""
return self.__end_pos
end_pos = Property(tuple, fget=end_pos)
[docs] def set_geometry(self, geometry):
"""
Set the geometry of the arrow as a start and end position tuples
(e.g. ``set_geometry(((0, 0), (100, 0))``).
"""
(start_pos, end_pos) = geometry
self.set_line(start_pos, end_pos)
def geometry(self):
"""
Return the start and end positions of the arrow.
"""
return (self.start_pos, self.end_pos)
geometry = Property(tuple, fget=geometry, fset=set_geometry)
[docs] def set_color(self, color):
"""
Set the fill color for the arrow as a string (`#RGB`, `#RRGGBB`,
`#RRRGGGBBB`, `#RRRRGGGGBBBB` format or one of SVG color keyword
names).
"""
if self.__color != color:
self.__color = color
self.color_changed.emit(color)
def color(self):
"""
The arrow's fill color.
"""
return self.__color
color = Property(str, fget=color, fset=set_color)
[docs]class SchemeTextAnnotation(BaseSchemeAnnotation):
"""
Text annotation in the scheme.
"""
# Signal emitted when the annotation content change.
content_changed = Signal(str, str)
# Signal emitted when the annotation text changes.
text_changed = Signal(str)
# Signal emitted when the annotation text font changes.
font_changed = Signal(dict)
def __init__(self, rect, text="", content_type="text/plain", font=None,
anchor=None, parent=None):
super().__init__(parent)
self.__rect = rect
self.__content = text
self.__content_type = content_type
self.__font = {} if font is None else font
self.__anchor = anchor
[docs] def set_rect(self, rect):
"""
Set the text geometry bounding rectangle (``(x, y, width, height)``
tuple).
"""
if self.__rect != rect:
self.__rect = rect
self.geometry_changed.emit()
def rect(self):
"""
Text bounding rectangle
"""
return self.__rect
rect = Property(tuple, fget=rect, fset=set_rect)
[docs] def set_geometry(self, rect):
"""
Set the text geometry (same as ``set_rect``)
"""
self.set_rect(rect)
def geometry(self):
"""
Text annotation geometry (same as ``rect``
"""
return self.rect
geometry = Property(tuple, fget=geometry, fset=set_geometry)
[docs] def set_text(self, text):
"""
Set the annotation text.
Same as `set_content(text, "text/plain")`
"""
self.set_content(text, "text/plain")
def text(self):
"""
Annotation text.
.. deprecated::
Use `content` instead.
"""
return self.__content
text = Property(tuple, fget=text, fset=set_text)
@property
def content_type(self):
"""
Return the annotations' content type.
Currently this will be 'text/plain', 'text/html' or 'text/rst'.
"""
return self.__content_type
@property
def content(self):
"""
The annotation content.
How the content is interpreted/displayed depends on `content_type`.
"""
return self.__content
[docs] def set_content(self, content, content_type="text/plain"):
"""
Set the annotation content.
Parameters
----------
content : str
The content.
content_type : str
Content type. Currently supported are 'text/plain' 'text/html'
(subset supported by `QTextDocument`) and `text/rst`.
"""
if self.__content != content or self.__content_type != content_type:
text_changed = self.__content != content
self.__content = content
self.__content_type = content_type
self.content_changed.emit(content, content_type)
if text_changed:
self.text_changed.emit(content)
[docs] def set_font(self, font):
"""
Set the annotation's default font as a dictionary of font properties
(at the moment only family and size are used).
>>> annotation.set_font({"family": "Helvetica", "size": 16})
"""
check_type(font, dict)
font = dict(font)
if self.__font != font:
self.__font = font
self.font_changed.emit(font)
def font(self):
"""
Annotation's font property dictionary.
"""
return dict(self.__font)
font = Property(str, fget=font, fset=set_font)