#
__version__ = '$Id: PmwFileDialog.py,v 1.2 2002/08/23 15:03:35 gregm Exp $'
#
# Filename dialogs using Pmw
#
# (C) Rob W.W. Hooft, Nonius BV, 1998
#
# Modifications:
#
# J. Willem M. Nissink, Cambridge Crystallographic Data Centre, 8/2002
#    Added optional information pane at top of dialog; if option
#    'info' is specified, the text given will be shown (in blue).
#    Modified example to show both file and directory-type dialog
#
# No Guarantees. Distribute Freely. 
# Please send bug-fixes/patches/features to <r.hooft@euromail.com>
#
################################################################################
import os,fnmatch,time
import Tkinter,Pmw
#Pmw.setversion("0.8.5")

def _errorpop(master,text):
    d=Pmw.MessageDialog(master,
                        title="Error", 
                        message_text=text,
                        buttons=("OK",))
    d.component('message').pack(ipadx=15,ipady=15)
    d.activate()
    d.destroy()
    
class PmwFileDialog(Pmw.Dialog):
    """File Dialog using Pmw"""
    def __init__(self, parent = None, **kw):
	# Define the megawidget options.
	optiondefs = (
	    ('filter',    '*',              self.newfilter),
	    ('directory', os.getcwd(),      self.newdir),
	    ('filename',  '',               self.newfilename),
	    ('historylen',10,               None),
	    ('command',   None,             None),
            ('info',      None,             None),
	    )
	self.defineoptions(kw, optiondefs)
        # Initialise base class (after defining options).
	Pmw.Dialog.__init__(self, parent)

	self.withdraw()

        # Create the components.
	interior = self.interior()

        if self['info'] is not None:
            rowoffset=1
            dn = self.infotxt()
            dn.grid(row=0,column=0,columnspan=2,padx=3,pady=3)
        else:
            rowoffset=0

	dn = self.mkdn()
	dn.grid(row=0+rowoffset,column=0,columnspan=2,padx=3,pady=3)
	del dn

	# Create the directory list component.
	dnb = self.mkdnb()
	dnb.grid(row=1+rowoffset,column=0,sticky='news',padx=3,pady=3)
	del dnb

	# Create the filename list component.
	fnb = self.mkfnb()
	fnb.grid(row=1+rowoffset,column=1,sticky='news',padx=3,pady=3)
	del fnb

	# Create the filter entry
	ft = self.mkft()
	ft.grid(row=2+rowoffset,column=0,columnspan=2,padx=3,pady=3)
	del ft

	# Create the filename entry
	fn = self.mkfn()
	fn.grid(row=3+rowoffset,column=0,columnspan=2,padx=3,pady=3)
	fn.bind('<Return>',self.okbutton)
	del fn

	# Buttonbox already exists
	bb=self.component('buttonbox')
	bb.add('OK',command=self.okbutton)
	bb.add('Cancel',command=self.cancelbutton)
	del bb

	Pmw.alignlabels([self.component('filename'),
			 self.component('filter'),
			 self.component('dirname')])

    def infotxt(self):
        """ Make information block component at the top """
        return self.createcomponent(
                'infobox',
                (), None,
                Tkinter.Label, (self.interior(),),
                width=51,
                relief='groove',
                foreground='darkblue',
                justify='left',
                text=self['info']
            )

    def mkdn(self):
        """Make directory name component"""
        return self.createcomponent(
	    'dirname',
	    (), None,
	    Pmw.ComboBox, (self.interior(),),
	    entryfield_value=self['directory'],
	    entryfield_entry_width=40,
            entryfield_validate=self.dirvalidate,
	    selectioncommand=self.setdir,
	    labelpos='w',
	    label_text='Directory:')

    def mkdnb(self):
        """Make directory name box"""
        return self.createcomponent(
	    'dirnamebox',
	    (), None,
	    Pmw.ScrolledListBox, (self.interior(),),
	    label_text='directories',
	    labelpos='n',
	    hscrollmode='none',
	    dblclickcommand=self.selectdir)

    def mkft(self):
        """Make filter"""
        return self.createcomponent(
	    'filter',
	    (), None,
	    Pmw.ComboBox, (self.interior(),),
	    entryfield_value=self['filter'],
	    entryfield_entry_width=40,
	    selectioncommand=self.setfilter,
	    labelpos='w',
	    label_text='Filter:')

    def mkfnb(self):
        """Make filename list box"""
        return self.createcomponent(
	    'filenamebox',
	    (), None,
	    Pmw.ScrolledListBox, (self.interior(),),
	    label_text='files',
	    labelpos='n',
	    hscrollmode='none',
	    selectioncommand=self.singleselectfile,
	    dblclickcommand=self.selectfile)

    def mkfn(self):
        """Make file name entry"""
        return self.createcomponent(
	    'filename',
	    (), None,
	    Pmw.ComboBox, (self.interior(),),
	    entryfield_value=self['filename'],
	    entryfield_entry_width=40,
            entryfield_validate=self.filevalidate,
	    selectioncommand=self.setfilename,
	    labelpos='w',
	    label_text='Filename:')
    
    def dirvalidate(self,string):
        if os.path.isdir(string):
            return Pmw.OK
        else:
            return Pmw.PARTIAL
        
    def filevalidate(self,string):
        if string=='':
            return Pmw.PARTIAL
        elif os.path.isfile(string):
            return Pmw.OK
        elif os.path.exists(string):
            return Pmw.PARTIAL
        else:
            return Pmw.OK
        
    def okbutton(self):
	"""OK action: user thinks he has input valid data and wants to
           proceed. This is also called by <Return> in the filename entry"""
	fn=self.component('filename').get()
	self.setfilename(fn)
	if self.validate(fn):
	    self.canceled=0
	    self.deactivate()

    def cancelbutton(self):
	"""Cancel the operation"""
	self.canceled=1
	self.deactivate()

    def tidy(self,w,v):
	"""Insert text v into the entry and at the top of the list of 
           the combobox w, remove duplicates"""
	if not v:
	    return
	entry=w.component('entry')
	entry.delete(0,'end')
	entry.insert(0,v)
	list=w.component('scrolledlist')
	list.insert(0,v)
	index=1
	while index<list.index('end'):
	    k=list.get(index)
	    if k==v or index>self['historylen']:
		list.delete(index)
	    else:
		index=index+1
        w.checkentry()

    def setfilename(self,value):
	if not value:
	    return
	value=os.path.join(self['directory'],value)
	dir,fil=os.path.split(value)
	self.configure(directory=dir,filename=value)
        
	c=self['command']
	if callable(c):
	    c()

    def newfilename(self):
	"""Make sure a newly set filename makes it into the combobox list"""
	self.tidy(self.component('filename'),self['filename'])
	
    def setfilter(self,value):
	self.configure(filter=value)

    def newfilter(self):
	"""Make sure a newly set filter makes it into the combobox list"""
	self.tidy(self.component('filter'),self['filter'])
	self.fillit()

    def setdir(self,value):
	self.configure(directory=value)

    def newdir(self):
	"""Make sure a newly set dirname makes it into the combobox list"""
	self.tidy(self.component('dirname'),self['directory'])
	self.fillit()

    def singleselectfile(self):
	"""Single click in file listbox. Move file to "filename" combobox"""
	cs=self.component('filenamebox').curselection()
	if cs!=():
	    value=self.component('filenamebox').get(cs)
            self.setfilename(value)

    def selectfile(self):
	"""Take the selected file from the filename, normalize it, and OK"""
        self.singleselectfile()
	value=self.component('filename').get()
        self.setfilename(value)
        if value:
	    self.okbutton()

    def selectdir(self):
	"""Take selected directory from the dirnamebox into the dirname"""
	cs=self.component('dirnamebox').curselection()
	if cs!=():
	    value=self.component('dirnamebox').get(cs)
	    dir=self['directory']
	    if not dir:
		dir=os.getcwd()
	    if value:
		if value=='..':
		    dir=os.path.split(dir)[0]
		else:
		    dir=os.path.join(dir,value)
	    self.configure(directory=dir)
	    self.fillit()

    def askfilename(self,directory=None,filter=None):
	"""The actual client function. Activates the dialog, and
	   returns only after a valid filename has been entered 
           (return value is that filename) or when canceled (return 
           value is None)"""
	if directory!=None:
	    self.configure(directory=directory)
	if filter!=None:
	    self.configure(filter=filter)
	self.fillit()
        self.canceled=1 # Needed for when user kills dialog window
	self.activate()
	if self.canceled:
	    return None
	else:
	    return self.component('filename').get()

    lastdir=""
    lastfilter=None
    lasttime=0
    def fillit(self):
	"""Get the directory list and show it in the two listboxes"""
        # Do not run unnecesarily
        if self.lastdir==self['directory'] and self.lastfilter==self['filter'] and self.lasttime>os.stat(self.lastdir)[8]:
            return
        self.lastdir=self['directory']
        self.lastfilter=self['filter']
        self.lasttime=time.time()
	dir=self['directory']
	if not dir:
	    dir=os.getcwd()
	dirs=['..']
	files=[]
        try:
            fl=os.listdir(dir)
            fl.sort()
        except os.error,arg:
            if arg[0] in (2,20):
                return
            raise
	for f in fl:
	    if os.path.isdir(os.path.join(dir,f)):
		dirs.append(f)
	    else:
		filter=self['filter']
		if not filter:
		    filter='*'
		if fnmatch.fnmatch(f,filter):
		    files.append(f)
	self.component('filenamebox').setlist(files)
	self.component('dirnamebox').setlist(dirs)
    
    def validate(self,filename):
	"""Validation function. Should return 1 if the filename is valid, 
           0 if invalid. May pop up dialogs to tell user why. Especially 
           suited to subclasses: i.e. only return 1 if the file does/doesn't 
           exist"""
	return 1

class PmwDirDialog(PmwFileDialog):
    """Directory Dialog using Pmw"""
    def __init__(self, parent = None, **kw):
	# Define the megawidget options.
	optiondefs = (
	    ('directory', os.getcwd(),      self.newdir),
	    ('historylen',10,               None),
	    ('command',   None,             None),
	    ('info',      None,             None),
	    )
	self.defineoptions(kw, optiondefs)
        # Initialise base class (after defining options).
	Pmw.Dialog.__init__(self, parent)

	self.withdraw()

        # Create the components.
	interior = self.interior()

        if self['info'] is not None:
            rowoffset=1
            dn = self.infotxt()
            dn.grid(row=0,column=0,columnspan=2,padx=3,pady=3)
        else:
            rowoffset=0

	dn = self.mkdn()
	dn.grid(row=1+rowoffset,column=0,columnspan=2,padx=3,pady=3)
	dn.bind('<Return>',self.okbutton)
	del dn

	# Create the directory list component.
	dnb = self.mkdnb()
	dnb.grid(row=0+rowoffset,column=0,columnspan=2,sticky='news',padx=3,pady=3)
	del dnb

	# Buttonbox already exists
	bb=self.component('buttonbox')
	bb.add('OK',command=self.okbutton)
	bb.add('Cancel',command=self.cancelbutton)
	del bb

    lastdir=""
    def fillit(self):
	"""Get the directory list and show it in the two listboxes"""
        # Do not run unnecesarily
        if self.lastdir==self['directory']:
            return
        self.lastdir=self['directory']
	dir=self['directory']
	if not dir:
	    dir=os.getcwd()
	dirs=['..']
        try:
            fl=os.listdir(dir)
            fl.sort()
        except os.error,arg:
            if arg[0] in (2,20):
                return
            raise
	for f in fl:
	    if os.path.isdir(os.path.join(dir,f)):
		dirs.append(f)
	self.component('dirnamebox').setlist(dirs)

    def okbutton(self):
	"""OK action: user thinks he has input valid data and wants to
           proceed. This is also called by <Return> in the dirname entry"""
	fn=self.component('dirname').get()
	self.configure(directory=fn)
	if self.validate(fn):
	    self.canceled=0
	    self.deactivate()
    
    def askfilename(self,directory=None):
	"""The actual client function. Activates the dialog, and
	   returns only after a valid filename has been entered 
           (return value is that filename) or when canceled (return 
           value is None)"""
	if directory!=None:
	    self.configure(directory=directory)
	self.fillit()
	self.activate()
	if self.canceled:
	    return None
	else:
	    return self.component('dirname').get()

    def dirvalidate(self,string):
        if os.path.isdir(string):
            return Pmw.OK
        elif os.path.exists(string):
            return Pmw.PARTIAL
        else:
            return Pmw.OK

    def validate(self,filename):
	"""Validation function. Should return 1 if the filename is valid, 
           0 if invalid. May pop up dialogs to tell user why. Especially 
           suited to subclasses: i.e. only return 1 if the file does/doesn't 
           exist"""
        if filename=='':
            _errorpop(self.interior(),"Empty filename")
            return 0
        if os.path.isdir(filename) or not os.path.exists(filename):
            return 1
        else:
            _errorpop(self.interior(),"This is not a directory")
            return 0

class PmwExistingFileDialog(PmwFileDialog):
    def filevalidate(self,string):
        if os.path.isfile(string):
            return Pmw.OK
        else:
            return Pmw.PARTIAL
        
    def validate(self,filename):
        if os.path.isfile(filename):
            return 1
        elif os.path.exists(filename):
            _errorpop(self.interior(),"This is not a plain file")
            return 0
        else:
            _errorpop(self.interior(),"Please select an existing file")
            return 0

class PmwExistingDirDialog(PmwDirDialog):
    def dirvalidate(self,string):
        if os.path.isdir(string):
            return Pmw.OK
        else:
            return Pmw.PARTIAL

    def validate(self,filename):
        if os.path.isdir(filename):
            return 1
        elif os.path.exists(filename):
            _errorpop(self.interior(),"This is not a directory")
            return 0
        else:
            _errorpop(self.interior(),"Please select an existing directory")
    
if __name__=="__main__":
    root=Tkinter.Tk()
    root.withdraw()
    Pmw.initialise()

    f0=PmwFileDialog(root)
    f0.title('File name dialog')
    n=f0.askfilename()
    print '\nFilename : ',repr(n),'\n'

    f1=PmwDirDialog(root,info='This is a directory dialog')
    f1.title('Directory name dialog')
    while 1:
	n=f1.askfilename()
	if n is None:
	    break
	print "Dirname : ",repr(n)