Update of /cvsroot/pythonreports/PythonReports/PythonReports
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv25141
Added Files:
TkDrivers.py
Log Message:
Rendering utilities for Tkinter backend
--- NEW FILE: TkDrivers.py ---
"""Rendering utilities for Tkinter backend
This module contains no image driver: Tkinter
does not provide sufficient image functionality.
"""
"""History (most recent first):
04-nov-2006 [als] created
"""
__version__ = "$Revision: 1.1 $"[11:-2]
__date__ = "$Date: 2006/11/04 14:18:45 $"[7:-2]
__all__ = ["TextDriver"]
import math
import tkFont
from PythonReports import drivers
class TextDriver(drivers.TextDriver):
"""Text processing driver
The driver is instantiated once for each report font
and handles all texts printed out with that font.
"""
backend = "Tk"
def __init__(self, font):
"""Create text driver instance
Parameters:
font: report font definition (element instance)
"""
super(TextDriver, self).__init__(font)
self._font = self._get_font(font)
self.height = self._font["size"]
# Tk fonts measure everything in pixels. we need points.
self._pointsize = self._font._root.winfo_fpixels("1p")
# convert linespace to points.
self._linespace = self._font.metrics("linespace") / self._pointsize
self.leading = int(math.ceil(self._linespace - self.height))
@staticmethod
def _get_font(font):
"""Return tkFont.Font for given template/printout font element"""
_attrs = {
"family": font.get("typeface"),
"size": font.get("size"),
"weight": "normal",
"slant": "roman",
"underline": False,
}
for (_prop, _attr, _value) in (
("bold", "weight", "bold"),
("italic", "style", "italic"),
("underline", "underline", True),
):
if font.get(_prop, False):
_attrs[_attr] = _value
return tkFont.Font(**_attrs)
def getsize(self, text):
"""Return size tuple (width, height) for given text"""
_lines = text.split("\n")
_height = int(math.ceil(self._linespace)) * len(_lines) - self.leading
_width = int(math.ceil(
max([self._font.measure(_line) for _line in _lines])
/ self._pointsize))
return (_width, _height)
# vim: set et sts=4 sw=4 :
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