Mini Shell

'''Define SearchDialogBase used by Search, Replace, and Grep dialogs.'''
from tkinter import *

class SearchDialogBase:
    '''Create most of a modal search dialog (make_frame, create_widgets).

    The wide left column contains:
    1 or 2 text entry lines (create_entries, make_entry);
    a row of standard radiobuttons (create_option_buttons);
    a row of dialog specific radiobuttons (create_other_buttons).

    The narrow right column contains command buttons
    (create_command_buttons, make_button).
    These are bound to functions that execute the command.

    Except for command buttons, this base class is not limited to
    items common to all three subclasses.  Rather, it is the Find dialog
    minus the "Find Next" command and its execution function.
    The other dialogs override methods to replace and add widgets.
    '''

    title = "Search Dialog"
    icon = "Search"
    needwrapbutton = 1

    def __init__(self, root, engine):
        self.root = root
        self.engine = engine
        self.top = None

    def open(self, text, searchphrase=None):
        self.text = text
        if not self.top:
            self.create_widgets()
        else:
            self.top.deiconify()
            self.top.tkraise()
        if searchphrase:
            self.ent.delete(0,"end")
            self.ent.insert("end",searchphrase)
        self.ent.focus_set()
        self.ent.selection_range(0, "end")
        self.ent.icursor(0)
        self.top.grab_set()

    def close(self, event=None):
        if self.top:
            self.top.grab_release()
            self.top.withdraw()

    def create_widgets(self):
        top = Toplevel(self.root)
        top.bind("<Return>", self.default_command)
        top.bind("<Escape>", self.close)
        top.protocol("WM_DELETE_WINDOW", self.close)
        top.wm_title(self.title)
        top.wm_iconname(self.icon)
        self.top = top

        self.row = 0
        self.top.grid_columnconfigure(0, pad=2, weight=0)
        self.top.grid_columnconfigure(1, pad=2, minsize=100, weight=100)

        self.create_entries()
        self.create_option_buttons()
        self.create_other_buttons()
        return self.create_command_buttons()

    def make_entry(self, label, var):
        l = Label(self.top, text=label)
        l.grid(row=self.row, column=0, sticky="nw")
        e = Entry(self.top, textvariable=var, exportselection=0)
        e.grid(row=self.row, column=1, sticky="nwe")
        self.row = self.row + 1
        return e

    def make_frame(self,labeltext=None):
        if labeltext:
            l = Label(self.top, text=labeltext)
            l.grid(row=self.row, column=0, sticky="nw")
        f = Frame(self.top)
        f.grid(row=self.row, column=1, columnspan=1, sticky="nwe")
        self.row = self.row + 1
        return f

    def make_button(self, label, command, isdef=0):
        b = Button(self.buttonframe,
                   text=label, command=command,
                   default=isdef and "active" or "normal")
        cols,rows=self.buttonframe.grid_size()
        b.grid(pady=1,row=rows,column=0,sticky="ew")
        self.buttonframe.grid(rowspan=rows+1)
        return b

    def create_entries(self):
        self.ent = self.make_entry("Find:", self.engine.patvar)

    def create_option_buttons(self):
        f = self.make_frame("Options")

        btn = Checkbutton(f, anchor="w",
                variable=self.engine.revar,
                text="Regular expression")
        btn.pack(side="left", fill="both")
        if self.engine.isre():
            btn.select()

        btn = Checkbutton(f, anchor="w",
                variable=self.engine.casevar,
                text="Match case")
        btn.pack(side="left", fill="both")
        if self.engine.iscase():
            btn.select()

        btn = Checkbutton(f, anchor="w",
                variable=self.engine.wordvar,
                text="Whole word")
        btn.pack(side="left", fill="both")
        if self.engine.isword():
            btn.select()

        if self.needwrapbutton:
            btn = Checkbutton(f, anchor="w",
                    variable=self.engine.wrapvar,
                    text="Wrap around")
            btn.pack(side="left", fill="both")
            if self.engine.iswrap():
                btn.select()

    def create_other_buttons(self):
        f = self.make_frame("Direction")

        #lbl = Label(f, text="Direction: ")
        #lbl.pack(side="left")

        btn = Radiobutton(f, anchor="w",
                variable=self.engine.backvar, value=1,
                text="Up")
        btn.pack(side="left", fill="both")
        if self.engine.isback():
            btn.select()

        btn = Radiobutton(f, anchor="w",
                variable=self.engine.backvar, value=0,
                text="Down")
        btn.pack(side="left", fill="both")
        if not self.engine.isback():
            btn.select()

    def create_command_buttons(self):
        #
        # place button frame on the right
        f = self.buttonframe = Frame(self.top)
        f.grid(row=0,column=2,padx=2,pady=2,ipadx=2,ipady=2)

        b = self.make_button("close", self.close)
        b.lower()