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328 lines
14 KiB
328 lines
14 KiB
3 years ago
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"""
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Dialog for building Tkinter accelerator key bindings
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"""
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from tkinter import Toplevel, Listbox, StringVar, TclError
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from tkinter.ttk import Frame, Button, Checkbutton, Entry, Label, Scrollbar
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from tkinter import messagebox
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from tkinter.simpledialog import _setup_dialog
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import string
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import sys
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FUNCTION_KEYS = ('F1', 'F2' ,'F3' ,'F4' ,'F5' ,'F6',
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'F7', 'F8' ,'F9' ,'F10' ,'F11' ,'F12')
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ALPHANUM_KEYS = tuple(string.ascii_lowercase + string.digits)
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PUNCTUATION_KEYS = tuple('~!@#%^&*()_-+={}[]|;:,.<>/?')
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WHITESPACE_KEYS = ('Tab', 'Space', 'Return')
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EDIT_KEYS = ('BackSpace', 'Delete', 'Insert')
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MOVE_KEYS = ('Home', 'End', 'Page Up', 'Page Down', 'Left Arrow',
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'Right Arrow', 'Up Arrow', 'Down Arrow')
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AVAILABLE_KEYS = (ALPHANUM_KEYS + PUNCTUATION_KEYS + FUNCTION_KEYS +
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WHITESPACE_KEYS + EDIT_KEYS + MOVE_KEYS)
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def translate_key(key, modifiers):
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"Translate from keycap symbol to the Tkinter keysym."
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mapping = {'Space':'space',
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'~':'asciitilde', '!':'exclam', '@':'at', '#':'numbersign',
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'%':'percent', '^':'asciicircum', '&':'ampersand',
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'*':'asterisk', '(':'parenleft', ')':'parenright',
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'_':'underscore', '-':'minus', '+':'plus', '=':'equal',
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'{':'braceleft', '}':'braceright',
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'[':'bracketleft', ']':'bracketright', '|':'bar',
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';':'semicolon', ':':'colon', ',':'comma', '.':'period',
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'<':'less', '>':'greater', '/':'slash', '?':'question',
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'Page Up':'Prior', 'Page Down':'Next',
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'Left Arrow':'Left', 'Right Arrow':'Right',
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'Up Arrow':'Up', 'Down Arrow': 'Down', 'Tab':'Tab'}
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key = mapping.get(key, key)
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if 'Shift' in modifiers and key in string.ascii_lowercase:
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key = key.upper()
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return f'Key-{key}'
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class GetKeysDialog(Toplevel):
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# Dialog title for invalid key sequence
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keyerror_title = 'Key Sequence Error'
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def __init__(self, parent, title, action, current_key_sequences,
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*, _htest=False, _utest=False):
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"""
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parent - parent of this dialog
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title - string which is the title of the popup dialog
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action - string, the name of the virtual event these keys will be
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mapped to
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current_key_sequences - list, a list of all key sequence lists
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currently mapped to virtual events, for overlap checking
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_htest - bool, change box location when running htest
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_utest - bool, do not wait when running unittest
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"""
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Toplevel.__init__(self, parent)
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self.withdraw() # Hide while setting geometry.
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self.configure(borderwidth=5)
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self.resizable(height=False, width=False)
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self.title(title)
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self.transient(parent)
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_setup_dialog(self)
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self.grab_set()
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self.protocol("WM_DELETE_WINDOW", self.cancel)
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self.parent = parent
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self.action = action
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self.current_key_sequences = current_key_sequences
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self.result = ''
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self.key_string = StringVar(self)
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self.key_string.set('')
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# Set self.modifiers, self.modifier_label.
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self.set_modifiers_for_platform()
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self.modifier_vars = []
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for modifier in self.modifiers:
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variable = StringVar(self)
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variable.set('')
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self.modifier_vars.append(variable)
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self.advanced = False
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self.create_widgets()
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self.update_idletasks()
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self.geometry(
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"+%d+%d" % (
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parent.winfo_rootx() +
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(parent.winfo_width()/2 - self.winfo_reqwidth()/2),
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parent.winfo_rooty() +
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((parent.winfo_height()/2 - self.winfo_reqheight()/2)
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if not _htest else 150)
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) ) # Center dialog over parent (or below htest box).
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if not _utest:
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self.deiconify() # Geometry set, unhide.
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self.wait_window()
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def showerror(self, *args, **kwargs):
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# Make testing easier. Replace in #30751.
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messagebox.showerror(*args, **kwargs)
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def create_widgets(self):
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self.frame = frame = Frame(self, borderwidth=2, relief='sunken')
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frame.pack(side='top', expand=True, fill='both')
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frame_buttons = Frame(self)
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frame_buttons.pack(side='bottom', fill='x')
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self.button_ok = Button(frame_buttons, text='OK',
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width=8, command=self.ok)
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self.button_ok.grid(row=0, column=0, padx=5, pady=5)
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self.button_cancel = Button(frame_buttons, text='Cancel',
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width=8, command=self.cancel)
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self.button_cancel.grid(row=0, column=1, padx=5, pady=5)
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# Basic entry key sequence.
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self.frame_keyseq_basic = Frame(frame, name='keyseq_basic')
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self.frame_keyseq_basic.grid(row=0, column=0, sticky='nsew',
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padx=5, pady=5)
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basic_title = Label(self.frame_keyseq_basic,
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text=f"New keys for '{self.action}' :")
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basic_title.pack(anchor='w')
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basic_keys = Label(self.frame_keyseq_basic, justify='left',
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textvariable=self.key_string, relief='groove',
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borderwidth=2)
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basic_keys.pack(ipadx=5, ipady=5, fill='x')
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# Basic entry controls.
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self.frame_controls_basic = Frame(frame)
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self.frame_controls_basic.grid(row=1, column=0, sticky='nsew', padx=5)
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# Basic entry modifiers.
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self.modifier_checkbuttons = {}
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column = 0
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for modifier, variable in zip(self.modifiers, self.modifier_vars):
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label = self.modifier_label.get(modifier, modifier)
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check = Checkbutton(self.frame_controls_basic,
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command=self.build_key_string, text=label,
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variable=variable, onvalue=modifier, offvalue='')
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check.grid(row=0, column=column, padx=2, sticky='w')
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self.modifier_checkbuttons[modifier] = check
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column += 1
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# Basic entry help text.
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help_basic = Label(self.frame_controls_basic, justify='left',
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text="Select the desired modifier keys\n"+
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"above, and the final key from the\n"+
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"list on the right.\n\n" +
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"Use upper case Symbols when using\n" +
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"the Shift modifier. (Letters will be\n" +
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"converted automatically.)")
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help_basic.grid(row=1, column=0, columnspan=4, padx=2, sticky='w')
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# Basic entry key list.
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self.list_keys_final = Listbox(self.frame_controls_basic, width=15,
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height=10, selectmode='single')
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self.list_keys_final.insert('end', *AVAILABLE_KEYS)
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self.list_keys_final.bind('<ButtonRelease-1>', self.final_key_selected)
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self.list_keys_final.grid(row=0, column=4, rowspan=4, sticky='ns')
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scroll_keys_final = Scrollbar(self.frame_controls_basic,
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orient='vertical',
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command=self.list_keys_final.yview)
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self.list_keys_final.config(yscrollcommand=scroll_keys_final.set)
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scroll_keys_final.grid(row=0, column=5, rowspan=4, sticky='ns')
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self.button_clear = Button(self.frame_controls_basic,
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text='Clear Keys',
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command=self.clear_key_seq)
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self.button_clear.grid(row=2, column=0, columnspan=4)
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# Advanced entry key sequence.
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self.frame_keyseq_advanced = Frame(frame, name='keyseq_advanced')
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self.frame_keyseq_advanced.grid(row=0, column=0, sticky='nsew',
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padx=5, pady=5)
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advanced_title = Label(self.frame_keyseq_advanced, justify='left',
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text=f"Enter new binding(s) for '{self.action}' :\n" +
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"(These bindings will not be checked for validity!)")
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advanced_title.pack(anchor='w')
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self.advanced_keys = Entry(self.frame_keyseq_advanced,
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textvariable=self.key_string)
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self.advanced_keys.pack(fill='x')
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# Advanced entry help text.
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self.frame_help_advanced = Frame(frame)
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self.frame_help_advanced.grid(row=1, column=0, sticky='nsew', padx=5)
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help_advanced = Label(self.frame_help_advanced, justify='left',
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text="Key bindings are specified using Tkinter keysyms as\n"+
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"in these samples: <Control-f>, <Shift-F2>, <F12>,\n"
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"<Control-space>, <Meta-less>, <Control-Alt-Shift-X>.\n"
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"Upper case is used when the Shift modifier is present!\n\n" +
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"'Emacs style' multi-keystroke bindings are specified as\n" +
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"follows: <Control-x><Control-y>, where the first key\n" +
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"is the 'do-nothing' keybinding.\n\n" +
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"Multiple separate bindings for one action should be\n"+
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"separated by a space, eg., <Alt-v> <Meta-v>." )
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help_advanced.grid(row=0, column=0, sticky='nsew')
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# Switch between basic and advanced.
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self.button_level = Button(frame, command=self.toggle_level,
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text='<< Basic Key Binding Entry')
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self.button_level.grid(row=2, column=0, stick='ew', padx=5, pady=5)
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self.toggle_level()
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def set_modifiers_for_platform(self):
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"""Determine list of names of key modifiers for this platform.
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The names are used to build Tk bindings -- it doesn't matter if the
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keyboard has these keys; it matters if Tk understands them. The
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order is also important: key binding equality depends on it, so
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config-keys.def must use the same ordering.
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"""
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if sys.platform == "darwin":
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self.modifiers = ['Shift', 'Control', 'Option', 'Command']
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else:
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self.modifiers = ['Control', 'Alt', 'Shift']
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self.modifier_label = {'Control': 'Ctrl'} # Short name.
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def toggle_level(self):
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"Toggle between basic and advanced keys."
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if self.button_level.cget('text').startswith('Advanced'):
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self.clear_key_seq()
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self.button_level.config(text='<< Basic Key Binding Entry')
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self.frame_keyseq_advanced.lift()
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self.frame_help_advanced.lift()
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self.advanced_keys.focus_set()
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self.advanced = True
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else:
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self.clear_key_seq()
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self.button_level.config(text='Advanced Key Binding Entry >>')
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self.frame_keyseq_basic.lift()
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self.frame_controls_basic.lift()
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self.advanced = False
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def final_key_selected(self, event=None):
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"Handler for clicking on key in basic settings list."
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self.build_key_string()
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def build_key_string(self):
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"Create formatted string of modifiers plus the key."
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keylist = modifiers = self.get_modifiers()
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final_key = self.list_keys_final.get('anchor')
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if final_key:
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final_key = translate_key(final_key, modifiers)
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keylist.append(final_key)
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self.key_string.set(f"<{'-'.join(keylist)}>")
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def get_modifiers(self):
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"Return ordered list of modifiers that have been selected."
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mod_list = [variable.get() for variable in self.modifier_vars]
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return [mod for mod in mod_list if mod]
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def clear_key_seq(self):
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"Clear modifiers and keys selection."
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self.list_keys_final.select_clear(0, 'end')
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self.list_keys_final.yview('moveto', '0.0')
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for variable in self.modifier_vars:
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variable.set('')
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self.key_string.set('')
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def ok(self, event=None):
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keys = self.key_string.get().strip()
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if not keys:
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self.showerror(title=self.keyerror_title, parent=self,
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message="No key specified.")
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return
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if (self.advanced or self.keys_ok(keys)) and self.bind_ok(keys):
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self.result = keys
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self.grab_release()
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self.destroy()
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def cancel(self, event=None):
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self.result = ''
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self.grab_release()
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self.destroy()
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def keys_ok(self, keys):
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"""Validity check on user's 'basic' keybinding selection.
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Doesn't check the string produced by the advanced dialog because
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'modifiers' isn't set.
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"""
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final_key = self.list_keys_final.get('anchor')
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modifiers = self.get_modifiers()
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title = self.keyerror_title
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key_sequences = [key for keylist in self.current_key_sequences
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for key in keylist]
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if not keys.endswith('>'):
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self.showerror(title, parent=self,
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message='Missing the final Key')
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elif (not modifiers
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and final_key not in FUNCTION_KEYS + MOVE_KEYS):
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self.showerror(title=title, parent=self,
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message='No modifier key(s) specified.')
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elif (modifiers == ['Shift']) \
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and (final_key not in
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FUNCTION_KEYS + MOVE_KEYS + ('Tab', 'Space')):
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msg = 'The shift modifier by itself may not be used with'\
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' this key symbol.'
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self.showerror(title=title, parent=self, message=msg)
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elif keys in key_sequences:
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msg = 'This key combination is already in use.'
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self.showerror(title=title, parent=self, message=msg)
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else:
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return True
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return False
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def bind_ok(self, keys):
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"Return True if Tcl accepts the new keys else show message."
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try:
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binding = self.bind(keys, lambda: None)
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except TclError as err:
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self.showerror(
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title=self.keyerror_title, parent=self,
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message=(f'The entered key sequence is not accepted.\n\n'
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f'Error: {err}'))
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return False
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else:
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self.unbind(keys, binding)
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return True
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if __name__ == '__main__':
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from unittest import main
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main('idlelib.idle_test.test_config_key', verbosity=2, exit=False)
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from idlelib.idle_test.htest import run
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run(GetKeysDialog)
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