widgets_f02a_02_infeasTreeview.py

# Copyright:   (c) Oskar Petersons 2013

"""Treeview widget for displaying misperceived states removed.

Loaded by the frame_02_infeasibles module.
Copied from a very similar widget used on the infeasibles screen.
"""

from tkinter import Tk, N, S, E, W, VERTICAL
from tkinter import ttk
from data_01_conflictModel import ConflictModel

NSEW = (N, S, E, W)


class TreeInfeas(ttk.Frame):
    """Treeview widget for displaying infeasible states removed."""

    def __init__(self, master, conflict=None, *args):
        """Initialize the widget."""
        ttk.Frame.__init__(self, master, padding=(5))

        self.conflict = conflict

        self.tDisp = ttk.Treeview(self, columns=('state', 'stDes', 'stRem'),
                                  selectmode='browse')
        self.scrl = ttk.Scrollbar(self, orient=VERTICAL,
                                  command=self.tDisp.yview)

        self.upBtn = ttk.Button(self, width=10, text='Up', command=self.upCmd)
        self.downBtn = ttk.Button(self, width=10, text='Down',
                                  command=self.downCmd)
        self.delBtn = ttk.Button(self, width=10, text='Delete',
                                 command=self.delCmd)

        # ##########

        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)

        self.tDisp.heading('state', text='Misperceived State')
        self.tDisp.heading('stDes', text='# of States Described')
        self.tDisp.heading('stRem', text='# of States Removed')
        self.tDisp['show'] = 'headings'

        self.tDisp.grid(column=0, row=0, columnspan=5, sticky=NSEW)
        self.scrl.grid(column=5, row=0, sticky=NSEW)
        self.tDisp.configure(yscrollcommand=self.scrl.set)

        self.upBtn.grid(column=2, row=2, sticky=NSEW)
        self.downBtn.grid(column=3, row=2, sticky=NSEW)
        self.delBtn.grid(column=4, row=2, sticky=NSEW)

        self.tDisp.bind('<<TreeviewSelect>>', self.selChgCmd)

    def refresh(self):
        """Fully refreshes the list displayed."""
        chldn = self.tDisp.get_children()
        for chld in chldn:
            self.tDisp.delete(chld)
        for misp in self.activeDM.misperceptions:
            key = misp.name
            self.tDisp.insert('', 'end', key, text=key)
            self.tDisp.set(key, 'state', key)
            self.tDisp.set(key, 'stDes', str(2**(key.count('-'))))
            self.tDisp.set(key, 'stRem', str(misp.statesRemoved))

    def selChgCmd(self, *args):
        """Called whenever the selection changes."""
        self.tDisp.selId = self.tDisp.selection()
        self.tDisp.selIdx = self.tDisp.index(self.tDisp.selId)
        self.event_generate('<<SelItem>>', x=self.tDisp.selIdx)

    def upCmd(self, *args):
        """Called whenever an item is moved upwards."""
        idx = self.tDisp.selIdx
        if idx != 0:
            self.activeDM.misperceptions.moveCondition(idx, idx - 1)
            self.activeDM.calculatePerceived()
            self.event_generate('<<ValueChange>>')
            self.tDisp.selection_set(self.tDisp.selId)
            self.selChgCmd()

    def downCmd(self, *args):
        """Called whenever an item is moved downwards."""
        idx = self.tDisp.selIdx
        if idx != len(self.conflict.infeasibles) - 1:
            self.activeDM.misperceptions.moveCondition(idx, idx + 1)
            self.activeDM.calculatePerceived()
            self.event_generate('<<ValueChange>>')
            self.tDisp.selection_set(self.tDisp.selId)
            self.selChgCmd()

    def delCmd(self, *args):
        """Called when an item is deleted."""
        idx = self.tDisp.selIdx
        self.activeDM.misperceptions.removeCondition(idx)
        self.activeDM.calculatePerceived()
        self.event_generate('<<ValueChange>>')
        if len(self.activeDM.misperceptions) > 0:
            try:
                self.tDisp.selection_set(
                    self.activeDM.misperceptions[idx].name)
            except IndexError:
                self.tDisp.selection_set(
                    self.activeDM.misperceptions[idx - 1].name)


def main():
    """Run widget in test window."""
    root = Tk()
    root.columnconfigure(0, weight=1)
    root.rowconfigure(0, weight=1)

    g1 = ConflictModel()
    g1.load_from_file('Examples/SyriaIraq.gmcr')

    theTree = TreeInfeas(root, g1)
    theTree.grid(column=0, row=0, sticky=NSEW)

    root.mainloop()

if __name__ == '__main__':
    main()