← Back
Editing: query.py
""" Dialogs that query users and verify the answer before accepting. Use ttk widgets, limiting use to tcl/tk 8.5+, as in IDLE 3.6+. Query is the generic base class for a popup dialog. The user must either enter a valid answer or close the dialog. Entries are validated when <Return> is entered or [Ok] is clicked. Entries are ignored when [Cancel] or [X] are clicked. The 'return value' is .result set to either a valid answer or None. Subclass SectionName gets a name for a new config file section. Configdialog uses it for new highlight theme and keybinding set names. Subclass ModuleName gets a name for File => Open Module. Subclass HelpSource gets menu item and path for additions to Help menu. """ # Query and Section name result from splitting GetCfgSectionNameDialog # of configSectionNameDialog.py (temporarily config_sec.py) into # generic and specific parts. 3.6 only, July 2016. # ModuleName.entry_ok came from editor.EditorWindow.load_module. # HelpSource was extracted from configHelpSourceEdit.py (temporarily # config_help.py), with darwin code moved from ok to path_ok. import importlib import os from sys import executable, platform # Platform is set for one test. from tkinter import Toplevel, StringVar, W, E, S from tkinter.ttk import Frame, Button, Entry, Label from tkinter import filedialog from tkinter.font import Font class Query(Toplevel): """Base class for getting verified answer from a user. For this base class, accept any non-blank string. """ def __init__(self, parent, title, message, *, text0='', used_names={}, _htest=False, _utest=False): """Create popup, do not return until tk widget destroyed. Additional subclass init must be done before calling this unless _utest=True is passed to suppress wait_window(). title - string, title of popup dialog message - string, informational message to display text0 - initial value for entry used_names - names already in use _htest - bool, change box location when running htest _utest - bool, leave window hidden and not modal """ Toplevel.__init__(self, parent) self.withdraw() # Hide while configuring, especially geometry. self.parent = parent self.title(title) self.message = message self.text0 = text0 self.used_names = used_names self.transient(parent) self.grab_set() windowingsystem = self.tk.call('tk', 'windowingsystem') if windowingsystem == 'aqua': try: self.tk.call('::tk::unsupported::MacWindowStyle', 'style', self._w, 'moveableModal', '') except: pass self.bind("<Command-.>", self.cancel) self.bind('<Key-Escape>', self.cancel) self.protocol("WM_DELETE_WINDOW", self.cancel) self.bind('<Key-Return>', self.ok) self.bind("<KP_Enter>", self.ok) self.resizable(height=False, width=False) self.create_widgets() self.update_idletasks() # Needed here for winfo_reqwidth below. self.geometry( # Center dialog over parent (or below htest box). "+%d+%d" % ( parent.winfo_rootx() + (parent.winfo_width()/2 - self.winfo_reqwidth()/2), parent.winfo_rooty() + ((parent.winfo_height()/2 - self.winfo_reqheight()/2) if not _htest else 150) ) ) if not _utest: self.deiconify() # Unhide now that geometry set. self.wait_window() def create_widgets(self): # Call from override, if any. # Bind to self widgets needed for entry_ok or unittest. self.frame = frame = Frame(self, padding=10) frame.grid(column=0, row=0, sticky='news') frame.grid_columnconfigure(0, weight=1) entrylabel = Label(frame, anchor='w', justify='left', text=self.message) self.entryvar = StringVar(self, self.text0) self.entry = Entry(frame, width=30, textvariable=self.entryvar) self.entry.focus_set() self.error_font = Font(name='TkCaptionFont', exists=True, root=self.parent) self.entry_error = Label(frame, text=' ', foreground='red', font=self.error_font) self.button_ok = Button( frame, text='OK', default='active', command=self.ok) self.button_cancel = Button( frame, text='Cancel', command=self.cancel) entrylabel.grid(column=0, row=0, columnspan=3, padx=5, sticky=W) self.entry.grid(column=0, row=1, columnspan=3, padx=5, sticky=W+E, pady=[10,0]) self.entry_error.grid(column=0, row=2, columnspan=3, padx=5, sticky=W+E) self.button_ok.grid(column=1, row=99, padx=5) self.button_cancel.grid(column=2, row=99, padx=5) def showerror(self, message, widget=None): #self.bell(displayof=self) (widget or self.entry_error)['text'] = 'ERROR: ' + message def entry_ok(self): # Example: usually replace. "Return non-blank entry or None." self.entry_error['text'] = '' entry = self.entry.get().strip() if not entry: self.showerror('blank line.') return None return entry def ok(self, event=None): # Do not replace. '''If entry is valid, bind it to 'result' and destroy tk widget. Otherwise leave dialog open for user to correct entry or cancel. ''' entry = self.entry_ok() if entry is not None: self.result = entry self.destroy() else: # [Ok] moves focus. (<Return> does not.) Move it back. self.entry.focus_set() def cancel(self, event=None): # Do not replace. "Set dialog result to None and destroy tk widget." self.result = None self.destroy() def destroy(self): self.grab_release() super().destroy() class SectionName(Query): "Get a name for a config file section name." # Used in ConfigDialog.GetNewKeysName, .GetNewThemeName (837) def __init__(self, parent, title, message, used_names, *, _htest=False, _utest=False): super().__init__(parent, title, message, used_names=used_names, _htest=_htest, _utest=_utest) def entry_ok(self): "Return sensible ConfigParser section name or None." self.entry_error['text'] = '' name = self.entry.get().strip() if not name: self.showerror('no name specified.') return None elif len(name)>30: self.showerror('name is longer than 30 characters.') return None elif name in self.used_names: self.showerror('name is already in use.') return None return name class ModuleName(Query): "Get a module name for Open Module menu entry." # Used in open_module (editor.EditorWindow until move to iobinding). def __init__(self, parent, title, message, text0, *, _htest=False, _utest=False): super().__init__(parent, title, message, text0=text0, _htest=_htest, _utest=_utest) def entry_ok(self): "Return entered module name as file path or None." self.entry_error['text'] = '' name = self.entry.get().strip() if not name: self.showerror('no name specified.') return None # XXX Ought to insert current file's directory in front of path. try: spec = importlib.util.find_spec(name) except (ValueError, ImportError) as msg: self.showerror(str(msg)) return None if spec is None: self.showerror("module not found") return None if not isinstance(spec.loader, importlib.abc.SourceLoader): self.showerror("not a source-based module") return None try: file_path = spec.loader.get_filename(name) except AttributeError: self.showerror("loader does not support get_filename", parent=self) return None return file_path class HelpSource(Query): "Get menu name and help source for Help menu." # Used in ConfigDialog.HelpListItemAdd/Edit, (941/9) def __init__(self, parent, title, *, menuitem='', filepath='', used_names={}, _htest=False, _utest=False): """Get menu entry and url/local file for Additional Help. User enters a name for the Help resource and a web url or file name. The user can browse for the file. """ self.filepath = filepath message = 'Name for item on Help menu:' super().__init__( parent, title, message, text0=menuitem, used_names=used_names, _htest=_htest, _utest=_utest) def create_widgets(self): super().create_widgets() frame = self.frame pathlabel = Label(frame, anchor='w', justify='left', text='Help File Path: Enter URL or browse for file') self.pathvar = StringVar(self, self.filepath) self.path = Entry(frame, textvariable=self.pathvar, width=40) browse = Button(frame, text='Browse', width=8, command=self.browse_file) self.path_error = Label(frame, text=' ', foreground='red', font=self.error_font) pathlabel.grid(column=0, row=10, columnspan=3, padx=5, pady=[10,0], sticky=W) self.path.grid(column=0, row=11, columnspan=2, padx=5, sticky=W+E, pady=[10,0]) browse.grid(column=2, row=11, padx=5, sticky=W+S) self.path_error.grid(column=0, row=12, columnspan=3, padx=5, sticky=W+E) def askfilename(self, filetypes, initdir, initfile): # htest # # Extracted from browse_file so can mock for unittests. # Cannot unittest as cannot simulate button clicks. # Test by running htest, such as by running this file. return filedialog.Open(parent=self, filetypes=filetypes)\ .show(initialdir=initdir, initialfile=initfile) def browse_file(self): filetypes = [ ("HTML Files", "*.htm *.html", "TEXT"), ("PDF Files", "*.pdf", "TEXT"), ("Windows Help Files", "*.chm"), ("Text Files", "*.txt", "TEXT"), ("All Files", "*")] path = self.pathvar.get() if path: dir, base = os.path.split(path) else: base = None if platform[:3] == 'win': dir = os.path.join(os.path.dirname(executable), 'Doc') if not os.path.isdir(dir): dir = os.getcwd() else: dir = os.getcwd() file = self.askfilename(filetypes, dir, base) if file: self.pathvar.set(file) item_ok = SectionName.entry_ok # localize for test override def path_ok(self): "Simple validity check for menu file path" path = self.path.get().strip() if not path: #no path specified self.showerror('no help file path specified.', self.path_error) return None elif not path.startswith(('www.', 'http')): if path[:5] == 'file:': path = path[5:] if not os.path.exists(path): self.showerror('help file path does not exist.', self.path_error) return None if platform == 'darwin': # for Mac Safari path = "file://" + path return path def entry_ok(self): "Return apparently valid (name, path) or None" self.entry_error['text'] = '' self.path_error['text'] = '' name = self.item_ok() path = self.path_ok() return None if name is None or path is None else (name, path) if __name__ == '__main__': from unittest import main main('idlelib.idle_test.test_query', verbosity=2, exit=False) from idlelib.idle_test.htest import run run(Query, HelpSource)
Save File
Cancel