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"""Demo based on the demo mclist included with tk source distribution."""
import Tkinter
import tkFont
import ttk

tree_columns = ("country", "capital", "currency")
tree_data = [
    ("Argentina",      "Buenos Aires",     "ARS"),
    ("Australia",      "Canberra",         "AUD"),
    ("Brazil",         "Brazilia",         "BRL"),
    ("Canada",         "Ottawa",           "CAD"),
    ("China",          "Beijing",          "CNY"),
    ("France",         "Paris",            "EUR"),
    ("Germany",        "Berlin",           "EUR"),
    ("India",          "New Delhi",        "INR"),
    ("Italy",          "Rome",             "EUR"),
    ("Japan",          "Tokyo",            "JPY"),
    ("Mexico",         "Mexico City",      "MXN"),
    ("Russia",         "Moscow",           "RUB"),
    ("South Africa",   "Pretoria",         "ZAR"),
    ("United Kingdom", "London",           "GBP"),
    ("United States",  "Washington, D.C.", "USD")
    ]

def sortby(tree, col, descending):
    """Sort tree contents when a column is clicked on."""
    # grab values to sort
    data = [(tree.set(child, col), child) for child in tree.get_children('')]

    # reorder data
    data.sort(reverse=descending)
    for indx, item in enumerate(data):
        tree.move(item[1], '', indx)

    # switch the heading so that it will sort in the opposite direction
    tree.heading(col,
        command=lambda col=col: sortby(tree, col, int(not descending)))

class App(object):
    def __init__(self):
        self.tree = None
        self._setup_widgets()
        self._build_tree()

    def _setup_widgets(self):
        msg = ttk.Label(wraplength="4i", justify="left", anchor="n",
            padding=(10, 2, 10, 6),
            text=("Ttk is the new Tk themed widget set. One of the widgets it "
                  "includes is a tree widget, which can be configured to "
                  "display multiple columns of informational data without "
                  "displaying the tree itself. This is a simple way to build "
                  "a listbox that has multiple columns. Clicking on the "
                  "heading for a column will sort the data by that column. "
                  "You can also change the width of the columns by dragging "
                  "the boundary between them."))
        msg.pack(fill='x')

        container = ttk.Frame()
        container.pack(fill='both', expand=True)

        # XXX Sounds like a good support class would be one for constructing
        #     a treeview with scrollbars.
        self.tree = ttk.Treeview(columns=tree_columns, show="headings")
        vsb = ttk.Scrollbar(orient="vertical", command=self.tree.yview)
        hsb = ttk.Scrollbar(orient="horizontal", command=self.tree.xview)
        self.tree.configure(yscrollcommand=vsb.set, xscrollcommand=hsb.set)
        self.tree.grid(column=0, row=0, sticky='nsew', in_=container)
        vsb.grid(column=1, row=0, sticky='ns', in_=container)
        hsb.grid(column=0, row=1, sticky='ew', in_=container)

        container.grid_columnconfigure(0, weight=1)
        container.grid_rowconfigure(0, weight=1)

    def _build_tree(self):
        for col in tree_columns:
            self.tree.heading(col, text=col.title(),
                command=lambda c=col: sortby(self.tree, c, 0))
            # XXX tkFont.Font().measure expected args are incorrect according
            #     to the Tk docs
            self.tree.column(col, width=tkFont.Font().measure(col.title()))

        for item in tree_data:
            self.tree.insert('', 'end', values=item)

            # adjust columns lenghts if necessary
            for indx, val in enumerate(item):
                ilen = tkFont.Font().measure(val)
                if self.tree.column(tree_columns[indx], width=None) < ilen:
                    self.tree.column(tree_columns[indx], width=ilen)

def main():
    root = Tkinter.Tk()
    root.wm_title("Multi-Column List")
    root.wm_iconname("mclist")

    import plastik_theme
    try:
        plastik_theme.install('~/tile-themes/plastik/plastik')
    except Exception:
        import warnings
        warnings.warn("plastik theme being used without images")

    app = App()
    root.mainloop()

if __name__ == "__main__":
    main()