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tkwrap.py
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tkwrap.py
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import tkinter
from tkinter.ttk import Label, Scrollbar, Sizegrip
from tkinter.ttk import Treeview
from tkinter.font import nametofont
from math import ceil
from itertools import cycle
from tkinter import getboolean
from collections import (Sequence, Iterable)
class Form(object):
def __init__(self, master, column=0):
self.master = master
self.column = column
self.master.columnconfigure(column + 1, weight=1)
en = font_size(nametofont("TkDefaultFont")["size"] / 2)
self.master.columnconfigure(column + 0, pad=en)
def add_field(self, widget, multiline=False, **kw):
label_sticky = [tkinter.EW]
widget_sticky = [tkinter.EW]
if multiline:
label_sticky.append(tkinter.N)
widget_sticky.append(tkinter.NS)
label = Label(self.master, **kw)
label.grid(column=self.column + 0, sticky=label_sticky)
row = grid_row(label)
if multiline:
self.master.rowconfigure(row, weight=1)
widget.grid(row=row, column=self.column + 1, sticky=widget_sticky)
def scroll(view, vert=True, horiz=True, resize=True):
"""Sets up scrollbars on view's master.
The view should not have any layout settings of its own."""
kw = dict()
if resize:
if not horiz:
kw.update(rowspan=2)
if not vert:
kw.update(colspan=2)
view.grid(sticky=(tkinter.EW, tkinter.NS), **kw)
view.master.rowconfigure(0, weight=1)
view.master.columnconfigure(0, weight=1)
if vert:
scroll = Scrollbar(view.master, orient=tkinter.VERTICAL,
command=view.yview)
scroll.grid(row=0, column=1, sticky=(tkinter.W, tkinter.NS))
view.configure(yscrollcommand=scroll.set)
if horiz:
scroll = Scrollbar(view.master, orient=tkinter.HORIZONTAL,
command=view.xview)
scroll.grid(row=1, column=0, sticky=(tkinter.N, tkinter.EW))
view.configure(xscrollcommand=scroll.set)
if resize:
resize = Sizegrip(view.master)
resize.grid(row=1, column=1, sticky=(tkinter.EW, tkinter.NS))
class Tree(Treeview):
def __init__(self, master, columns=1, tree=True, headings=True):
"""
columns: int, or len(columns): Number of columns; default: 1
iter(columns): Iterator of dict() objects; optional. Elements may
also be strings, equivalent to the "heading" value. Keys:
"heading": Optional
"width": Optional"""
try:
self.nontree_columns = len(columns)
except TypeError:
if isinstance(columns, Iterable):
columns = tuple(columns)
self.nontree_columns = len(columns)
else:
self.nontree_columns = columns
columns = cycle((dict(),))
show = list()
self.tree_shown = tree
if self.tree_shown:
show.append("tree")
self.nontree_columns -= 1
if headings:
show.append("headings")
self.nontree_columns = range(self.nontree_columns)
Treeview.__init__(self, master, show=show,
columns=tuple(self.nontree_columns))
self.heading_font = nametofont("TkHeadingFont")
self.heading_space = "\N{EN QUAD}"
self.space_size = self.heading_font.measure(self.heading_space)
self.text_font = nametofont("TkTextFont")
self.auto_width = list()
for (key, value) in zip(self.columns(), columns):
if isinstance(value, str):
value = dict(heading=value)
if headings:
try:
heading = value["heading"]
except LookupError:
pass
else:
self.heading(key, text=heading)
try:
width = value["width"]
except LookupError:
auto = True
if headings:
text = self.heading(key, option="text")
text += self.heading_space
width = self.heading_font.measure(text)
else:
auto = False
try:
(width, unit) = width
except TypeError:
unit = self.FIGURE
width *= self.text_font.measure(unit)
width += self.space_size
self.auto_width.append(auto)
width = max(width, self.column(key, option="minwidth"))
stretch = value.get("stretch", False)
self.column(key, stretch=stretch, width=width)
self.bind("<End>", self.end)
FIGURE = "\N{FIGURE SPACE}"
def end(self, event):
item = ""
while True:
children = self.get_children(item)
if not children:
break
item = children[-1]
# Sometimes the "open" option is the integer 0; other times it is
# a Tcl_Obj() with a string value of "true" or "false"!
if not getboolean(str(self.item(item, option="open"))):
break
self.focus(item)
self.selection_set((item,))
self.see(item)
def columns(self):
if self.tree_shown:
yield "#0"
for column in self.nontree_columns:
yield column
def add(self, parent="", *args, expand=False, **kw):
if not isinstance(kw.get("values", ()), Sequence):
kw["values"] = tuple(kw["values"])
child = self.insert(parent, "end", *args, **kw)
if not self.focus():
self.focus(child)
if not expand:
return child
auto = iter(self.auto_width)
if self.tree_shown and next(auto):
width = 1
while parent:
width += 1
parent = self.parent(parent)
em = font_size(self.text_font["size"])
width *= self.winfo_fpixels(em)
try:
text = kw["text"]
except LookupError:
pass
else:
width += self.text_font.measure(text) + self.space_size
if width > self.column("#0", option="width"):
self.column("#0", width=ceil(width))
for i in self.nontree_columns:
if not next(auto):
continue
width = self.min_width(child, i)
if width > self.column(i, option="width"):
self.column(i, width=width)
return child
def min_width(self, item, column):
text = self.set(item, column)
return self.text_font.measure(text) + self.space_size
def bind_select(self, *args, **kw):
return self.bind("<<TreeviewSelect>>", *args, **kw)
def unbind_select(self, *args, **kw):
return self.unbind("<<TreeviewSelect>>", *args, **kw)
def font_size(size):
if size < 0:
return -size
else:
return "{}p".format(size)
def grid_row(widget):
"""Workaround for Issue 16809: "Tk 8.6.0 introduces TypeError"
http://bugs.python.org/issue16809"""
grid = widget.tk.splitlist(str(widget.tk.call("grid", "info", widget)))
for i in range(0, len(grid), 2):
if grid[i + 0] == "-row":
return grid[i + 1]