Lib/idlelib/keybindingDialog.py

   1 """
   2 Dialog for building Tkinter accelerator key bindings
   3 """
   4 from Tkinter import *
   5 import tkMessageBox
   6 import string
   7
   8 class GetKeysDialog(Toplevel):
   9     def __init__(self,parent,title,action,currentKeySequences):
  10         """
  11         action - string, the name of the virtual event these keys will be
  12                  mapped to
  13         currentKeys - list, a list of all key sequence lists currently mapped
  14                  to virtual events, for overlap checking
  15         """
  16         Toplevel.__init__(self, parent)
  17         self.configure(borderwidth=5)
  18         self.resizable(height=FALSE,width=FALSE)
  19         self.title(title)
  20         self.transient(parent)
  21         self.grab_set()
  22         self.protocol("WM_DELETE_WINDOW", self.Cancel)
  23         self.parent = parent
  24         self.action=action
  25         self.currentKeySequences=currentKeySequences
  26         self.result=''
  27         self.keyString=StringVar(self)
  28         self.keyString.set('')
  29         self.SetModifiersForPlatform() # set self.modifiers, self.modifier_label
  30         self.modifier_vars = []
  31         for modifier in self.modifiers:
  32             variable = StringVar(self)
  33             variable.set('')
  34             self.modifier_vars.append(variable)
  35         self.advanced = False
  36         self.CreateWidgets()
  37         self.LoadFinalKeyList()
  38         self.withdraw() #hide while setting geometry
  39         self.update_idletasks()
  40         self.geometry("+%d+%d" %
  41             ((parent.winfo_rootx()+((parent.winfo_width()/2)
  42                 -(self.winfo_reqwidth()/2)),
  43               parent.winfo_rooty()+((parent.winfo_height()/2)
  44                 -(self.winfo_reqheight()/2)) )) ) #centre dialog over parent
  45         self.deiconify() #geometry set, unhide
  46         self.wait_window()
  47
  48     def CreateWidgets(self):
  49         frameMain = Frame(self,borderwidth=2,relief=SUNKEN)
  50         frameMain.pack(side=TOP,expand=TRUE,fill=BOTH)
  51         frameButtons=Frame(self)
  52         frameButtons.pack(side=BOTTOM,fill=X)
  53         self.buttonOK = Button(frameButtons,text='OK',
  54                 width=8,command=self.OK)
  55         self.buttonOK.grid(row=0,column=0,padx=5,pady=5)
  56         self.buttonCancel = Button(frameButtons,text='Cancel',
  57                 width=8,command=self.Cancel)
  58         self.buttonCancel.grid(row=0,column=1,padx=5,pady=5)
  59         self.frameKeySeqBasic = Frame(frameMain)
  60         self.frameKeySeqAdvanced = Frame(frameMain)
  61         self.frameControlsBasic = Frame(frameMain)
  62         self.frameHelpAdvanced = Frame(frameMain)
  63         self.frameKeySeqAdvanced.grid(row=0,column=0,sticky=NSEW,padx=5,pady=5)
  64         self.frameKeySeqBasic.grid(row=0,column=0,sticky=NSEW,padx=5,pady=5)
  65         self.frameKeySeqBasic.lift()
  66         self.frameHelpAdvanced.grid(row=1,column=0,sticky=NSEW,padx=5)
  67         self.frameControlsBasic.grid(row=1,column=0,sticky=NSEW,padx=5)
  68         self.frameControlsBasic.lift()
  69         self.buttonLevel = Button(frameMain,command=self.ToggleLevel,
  70                 text='Advanced Key Binding Entry >>')
  71         self.buttonLevel.grid(row=2,column=0,stick=EW,padx=5,pady=5)
  72         labelTitleBasic = Label(self.frameKeySeqBasic,
  73                 text="New keys for  '"+self.action+"' :")
  74         labelTitleBasic.pack(anchor=W)
  75         labelKeysBasic = Label(self.frameKeySeqBasic,justify=LEFT,
  76                 textvariable=self.keyString,relief=GROOVE,borderwidth=2)
  77         labelKeysBasic.pack(ipadx=5,ipady=5,fill=X)
  78         self.modifier_checkbuttons = {}
  79         column = 0
  80         for modifier, variable in zip(self.modifiers, self.modifier_vars):
  81             label = self.modifier_label.get(modifier, modifier)
  82             check=Checkbutton(self.frameControlsBasic,
  83                 command=self.BuildKeyString,
  84                 text=label,variable=variable,onvalue=modifier,offvalue='')
  85             check.grid(row=0,column=column,padx=2,sticky=W)
  86             self.modifier_checkbuttons[modifier] = check
  87             column += 1
  88         labelFnAdvice=Label(self.frameControlsBasic,justify=LEFT,
  89                             text=\
  90                             "Select the desired modifier keys\n"+
  91                             "above, and the final key from the\n"+
  92                             "list on the right.\n\n" +
  93                             "Use upper case Symbols when using\n" +
  94                             "the Shift modifier.  (Letters will be\n" +
  95                             "converted automatically.)")
  96         labelFnAdvice.grid(row=1,column=0,columnspan=4,padx=2,sticky=W)
  97         self.listKeysFinal=Listbox(self.frameControlsBasic,width=15,height=10,
  98                 selectmode=SINGLE)
  99         self.listKeysFinal.bind('<ButtonRelease-1>',self.FinalKeySelected)
 100         self.listKeysFinal.grid(row=0,column=4,rowspan=4,sticky=NS)
 101         scrollKeysFinal=Scrollbar(self.frameControlsBasic,orient=VERTICAL,
 102                 command=self.listKeysFinal.yview)
 103         self.listKeysFinal.config(yscrollcommand=scrollKeysFinal.set)
 104         scrollKeysFinal.grid(row=0,column=5,rowspan=4,sticky=NS)
 105         self.buttonClear=Button(self.frameControlsBasic,
 106                 text='Clear Keys',command=self.ClearKeySeq)
 107         self.buttonClear.grid(row=2,column=0,columnspan=4)
 108         labelTitleAdvanced = Label(self.frameKeySeqAdvanced,justify=LEFT,
 109                 text="Enter new binding(s) for  '"+self.action+"' :\n"+
 110                 "(These bindings will not be checked for validity!)")
 111         labelTitleAdvanced.pack(anchor=W)
 112         self.entryKeysAdvanced=Entry(self.frameKeySeqAdvanced,
 113                 textvariable=self.keyString)
 114         self.entryKeysAdvanced.pack(fill=X)
 115         labelHelpAdvanced=Label(self.frameHelpAdvanced,justify=LEFT,
 116             text="Key bindings are specified using Tkinter keysyms as\n"+
 117                  "in these samples: <Control-f>, <Shift-F2>, <F12>,\n"
 118                  "<Control-space>, <Meta-less>, <Control-Alt-Shift-X>.\n"
 119                  "Upper case is used when the Shift modifier is present!\n\n" +
 120                  "'Emacs style' multi-keystroke bindings are specified as\n" +
 121                  "follows: <Control-x><Control-y>, where the first key\n" +
 122                  "is the 'do-nothing' keybinding.\n\n" +
 123                  "Multiple separate bindings for one action should be\n"+
 124                  "separated by a space, eg., <Alt-v> <Meta-v>." )
 125         labelHelpAdvanced.grid(row=0,column=0,sticky=NSEW)
 126
 127     def SetModifiersForPlatform(self):
 128         """Determine list of names of key modifiers for this platform.
 129
 130         The names are used to build Tk bindings -- it doesn't matter if the
 131         keyboard has these keys, it matters if Tk understands them. The
 132         order is also important: key binding equality depends on it, so
 133         config-keys.def must use the same ordering.
 134         """
 135         import macosxSupport
 136         if macosxSupport.runningAsOSXApp():
 137             self.modifiers = ['Shift', 'Control', 'Option', 'Command']
 138         else:
 139             self.modifiers = ['Control', 'Alt', 'Shift']
 140         self.modifier_label = {'Control': 'Ctrl'} # short name
 141
 142     def ToggleLevel(self):
 143         if  self.buttonLevel.cget('text')[:8]=='Advanced':
 144             self.ClearKeySeq()
 145             self.buttonLevel.config(text='<< Basic Key Binding Entry')
 146             self.frameKeySeqAdvanced.lift()
 147             self.frameHelpAdvanced.lift()
 148             self.entryKeysAdvanced.focus_set()
 149             self.advanced = True
 150         else:
 151             self.ClearKeySeq()
 152             self.buttonLevel.config(text='Advanced Key Binding Entry >>')
 153             self.frameKeySeqBasic.lift()
 154             self.frameControlsBasic.lift()
 155             self.advanced = False
 156
 157     def FinalKeySelected(self,event):
 158         self.BuildKeyString()
 159
 160     def BuildKeyString(self):
 161         keyList = modifiers = self.GetModifiers()
 162         finalKey = self.listKeysFinal.get(ANCHOR)
 163         if finalKey:
 164             finalKey = self.TranslateKey(finalKey, modifiers)
 165             keyList.append(finalKey)
 166         self.keyString.set('<' + string.join(keyList,'-') + '>')
 167
 168     def GetModifiers(self):
 169         modList = [variable.get() for variable in self.modifier_vars]
 170         return filter(None, modList)
 171
 172     def ClearKeySeq(self):
 173         self.listKeysFinal.select_clear(0,END)
 174         self.listKeysFinal.yview(MOVETO, '0.0')
 175         for variable in self.modifier_vars:
 176             variable.set('')
 177         self.keyString.set('')
 178
 179     def LoadFinalKeyList(self):
 180         #these tuples are also available for use in validity checks
 181         self.functionKeys=('F1','F2','F2','F4','F5','F6','F7','F8','F9',
 182                 'F10','F11','F12')
 183         self.alphanumKeys=tuple(string.ascii_lowercase+string.digits)
 184         self.punctuationKeys=tuple('~!@#%^&*()_-+={}[]|;:,.<>/?')
 185         self.whitespaceKeys=('Tab','Space','Return')
 186         self.editKeys=('BackSpace','Delete','Insert')
 187         self.moveKeys=('Home','End','Page Up','Page Down','Left Arrow',
 188                 'Right Arrow','Up Arrow','Down Arrow')
 189         #make a tuple of most of the useful common 'final' keys
 190         keys=(self.alphanumKeys+self.punctuationKeys+self.functionKeys+
 191                 self.whitespaceKeys+self.editKeys+self.moveKeys)
 192         self.listKeysFinal.insert(END, *keys)
 193
 194     def TranslateKey(self, key, modifiers):
 195         "Translate from keycap symbol to the Tkinter keysym"
 196         translateDict = {'Space':'space',
 197                 '~':'asciitilde','!':'exclam','@':'at','#':'numbersign',
 198                 '%':'percent','^':'asciicircum','&':'ampersand','*':'asterisk',
 199                 '(':'parenleft',')':'parenright','_':'underscore','-':'minus',
 200                 '+':'plus','=':'equal','{':'braceleft','}':'braceright',
 201                 '[':'bracketleft',']':'bracketright','|':'bar',';':'semicolon',
 202                 ':':'colon',',':'comma','.':'period','<':'less','>':'greater',
 203                 '/':'slash','?':'question','Page Up':'Prior','Page Down':'Next',
 204                 'Left Arrow':'Left','Right Arrow':'Right','Up Arrow':'Up',
 205                 'Down Arrow': 'Down', 'Tab':'Tab'}
 206         if key in translateDict.keys():
 207             key = translateDict[key]
 208         if 'Shift' in modifiers and key in string.ascii_lowercase:
 209             key = key.upper()
 210         key = 'Key-' + key
 211         return key
 212
 213     def OK(self, event=None):
 214         if self.advanced or self.KeysOK():  # doesn't check advanced string yet
 215             self.result=self.keyString.get()
 216             self.destroy()
 217
 218     def Cancel(self, event=None):
 219         self.result=''
 220         self.destroy()
 221
 222     def KeysOK(self):
 223         '''Validity check on user's 'basic' keybinding selection.
 224
 225         Doesn't check the string produced by the advanced dialog because
 226         'modifiers' isn't set.
 227
 228         '''
 229         keys = self.keyString.get()
 230         keys.strip()
 231         finalKey = self.listKeysFinal.get(ANCHOR)
 232         modifiers = self.GetModifiers()
 233         # create a key sequence list for overlap check:
 234         keySequence = keys.split()
 235         keysOK = False
 236         title = 'Key Sequence Error'
 237         if not keys:
 238             tkMessageBox.showerror(title=title, parent=self,
 239                                    message='No keys specified.')
 240         elif not keys.endswith('>'):
 241             tkMessageBox.showerror(title=title, parent=self,
 242                                    message='Missing the final Key')
 243         elif (not modifiers
 244               and finalKey not in self.functionKeys + self.moveKeys):
 245             tkMessageBox.showerror(title=title, parent=self,
 246                                    message='No modifier key(s) specified.')
 247         elif (modifiers == ['Shift']) \
 248                  and (finalKey not in
 249                       self.functionKeys + self.moveKeys + ('Tab', 'Space')):
 250             msg = 'The shift modifier by itself may not be used with'\
 251                   ' this key symbol.'
 252             tkMessageBox.showerror(title=title, parent=self, message=msg)
 253         elif keySequence in self.currentKeySequences:
 254             msg = 'This key combination is already in use.'
 255             tkMessageBox.showerror(title=title, parent=self, message=msg)
 256         else:
 257             keysOK = True
 258         return keysOK
 259
 260 if __name__ == '__main__':
 261     #test the dialog
 262     root=Tk()
 263     def run():
 264         keySeq=''
 265         dlg=GetKeysDialog(root,'Get Keys','find-again',[])
 266         print dlg.result
 267     Button(root,text='Dialog',command=run).pack()
 268     root.mainloop()