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Edit File : TreeWidget.py \| Size : 14.68 KB
# XXX TO DO: # - popup menu # - support partial or total redisplay # - key bindings (instead of quick-n-dirty bindings on Canvas): # - up/down arrow keys to move focus around # - ditto for page up/down, home/end # - left/right arrows to expand/collapse & move out/in # - more doc strings # - add icons for "file", "module", "class", "method"; better "python" icon # - callback for selection??? # - multiple-item selection # - tooltips # - redo geometry without magic numbers # - keep track of object ids to allow more careful cleaning # - optimize tree redraw after expand of subnode import os from Tkinter import * import imp from idlelib import ZoomHeight from idlelib.configHandler import idleConf ICONDIR = "Icons" # Look for Icons subdirectory in the same directory as this module try: _icondir = os.path.join(os.path.dirname(__file__), ICONDIR) except NameError: _icondir = ICONDIR if os.path.isdir(_icondir): ICONDIR = _icondir elif not os.path.isdir(ICONDIR): raise RuntimeError, "can't find icon directory (%r)" % (ICONDIR,) def listicons(icondir=ICONDIR): """Utility to display the available icons.""" root = Tk() import glob list = glob.glob(os.path.join(icondir, ".gif")) list.sort() images = [] row = column = 0 for file in list: name = os.path.splitext(os.path.basename(file))[0] image = PhotoImage(file=file, master=root) images.append(image) label = Label(root, image=image, bd=1, relief="raised") label.grid(row=row, column=column) label = Label(root, text=name) label.grid(row=row+1, column=column) column = column + 1 if column >= 10: row = row+2 column = 0 root.images = images class TreeNode: def __init__(self, canvas, parent, item): self.canvas = canvas self.parent = parent self.item = item self.state = 'collapsed' self.selected = False self.children = [] self.x = self.y = None self.iconimages = {} # cache of PhotoImage instances for icons def destroy(self): for c in self.children[:]: self.children.remove(c) c.destroy() self.parent = None def geticonimage(self, name): try: return self.iconimages[name] except KeyError: pass file, ext = os.path.splitext(name) ext = ext or ".gif" fullname = os.path.join(ICONDIR, file + ext) image = PhotoImage(master=self.canvas, file=fullname) self.iconimages[name] = image return image def select(self, event=None): if self.selected: return self.deselectall() self.selected = True self.canvas.delete(self.image_id) self.drawicon() self.drawtext() def deselect(self, event=None): if not self.selected: return self.selected = False self.canvas.delete(self.image_id) self.drawicon() self.drawtext() def deselectall(self): if self.parent: self.parent.deselectall() else: self.deselecttree() def deselecttree(self): if self.selected: self.deselect() for child in self.children: child.deselecttree() def flip(self, event=None): if self.state == 'expanded': self.collapse() else: self.expand() self.item.OnDoubleClick() return "break" def expand(self, event=None): if not self.item._IsExpandable(): return if self.state != 'expanded': self.state = 'expanded' self.update() self.view() def collapse(self, event=None): if self.state != 'collapsed': self.state = 'collapsed' self.update() def view(self): top = self.y - 2 bottom = self.lastvisiblechild().y + 17 height = bottom - top visible_top = self.canvas.canvasy(0) visible_height = self.canvas.winfo_height() visible_bottom = self.canvas.canvasy(visible_height) if visible_top <= top and bottom <= visible_bottom: return x0, y0, x1, y1 = self.canvas._getints(self.canvas['scrollregion']) if top >= visible_top and height <= visible_height: fraction = top + height - visible_height else: fraction = top fraction = float(fraction) / y1 self.canvas.yview_moveto(fraction) def lastvisiblechild(self): if self.children and self.state == 'expanded': return self.children[-1].lastvisiblechild() else: return self def update(self): if self.parent: self.parent.update() else: oldcursor = self.canvas['cursor'] self.canvas['cursor'] = "watch" self.canvas.update() self.canvas.delete(ALL) # XXX could be more subtle self.draw(7, 2) x0, y0, x1, y1 = self.canvas.bbox(ALL) self.canvas.configure(scrollregion=(0, 0, x1, y1)) self.canvas['cursor'] = oldcursor def draw(self, x, y): # XXX This hard-codes too many geometry constants! dy = 20 self.x, self.y = x, y self.drawicon() self.drawtext() if self.state != 'expanded': return y + dy # draw children if not self.children: sublist = self.item._GetSubList() if not sublist: # _IsExpandable() was mistaken; that's allowed return y+17 for item in sublist: child = self.__class__(self.canvas, self, item) self.children.append(child) cx = x+20 cy = y + dy cylast = 0 for child in self.children: cylast = cy self.canvas.create_line(x+9, cy+7, cx, cy+7, fill="gray50") cy = child.draw(cx, cy) if child.item._IsExpandable(): if child.state == 'expanded': iconname = "minusnode" callback = child.collapse else: iconname = "plusnode" callback = child.expand image = self.geticonimage(iconname) id = self.canvas.create_image(x+9, cylast+7, image=image) # XXX This leaks bindings until canvas is deleted: self.canvas.tag_bind(id, "<1>", callback) self.canvas.tag_bind(id, "<Double-1>", lambda x: None) id = self.canvas.create_line(x+9, y+10, x+9, cylast+7, ##stipple="gray50", # XXX Seems broken in Tk 8.0.x fill="gray50") self.canvas.tag_lower(id) # XXX .lower(id) before Python 1.5.2 return cy def drawicon(self): if self.selected: imagename = (self.item.GetSelectedIconName() or self.item.GetIconName() or "openfolder") else: imagename = self.item.GetIconName() or "folder" image = self.geticonimage(imagename) id = self.canvas.create_image(self.x, self.y, anchor="nw", image=image) self.image_id = id self.canvas.tag_bind(id, "<1>", self.select) self.canvas.tag_bind(id, "<Double-1>", self.flip) def drawtext(self): textx = self.x+20-1 texty = self.y-4 labeltext = self.item.GetLabelText() if labeltext: id = self.canvas.create_text(textx, texty, anchor="nw", text=labeltext) self.canvas.tag_bind(id, "<1>", self.select) self.canvas.tag_bind(id, "<Double-1>", self.flip) x0, y0, x1, y1 = self.canvas.bbox(id) textx = max(x1, 200) + 10 text = self.item.GetText() or "<no text>" try: self.entry except AttributeError: pass else: self.edit_finish() try: self.label except AttributeError: # padding carefully selected (on Windows) to match Entry widget: self.label = Label(self.canvas, text=text, bd=0, padx=2, pady=2) theme = idleConf.CurrentTheme() if self.selected: self.label.configure(idleConf.GetHighlight(theme, 'hilite')) else: self.label.configure(idleConf.GetHighlight(theme, 'normal')) id = self.canvas.create_window(textx, texty, anchor="nw", window=self.label) self.label.bind("<1>", self.select_or_edit) self.label.bind("<Double-1>", self.flip) self.text_id = id def select_or_edit(self, event=None): if self.selected and self.item.IsEditable(): self.edit(event) else: self.select(event) def edit(self, event=None): self.entry = Entry(self.label, bd=0, highlightthickness=1, width=0) self.entry.insert(0, self.label['text']) self.entry.selection_range(0, END) self.entry.pack(ipadx=5) self.entry.focus_set() self.entry.bind("<Return>", self.edit_finish) self.entry.bind("<Escape>", self.edit_cancel) def edit_finish(self, event=None): try: entry = self.entry del self.entry except AttributeError: return text = entry.get() entry.destroy() if text and text != self.item.GetText(): self.item.SetText(text) text = self.item.GetText() self.label['text'] = text self.drawtext() self.canvas.focus_set() def edit_cancel(self, event=None): try: entry = self.entry del self.entry except AttributeError: return entry.destroy() self.drawtext() self.canvas.focus_set() class TreeItem: """Abstract class representing tree items. Methods should typically be overridden, otherwise a default action is used. """ def __init__(self): """Constructor. Do whatever you need to do.""" def GetText(self): """Return text string to display.""" def GetLabelText(self): """Return label text string to display in front of text (if any).""" expandable = None def _IsExpandable(self): """Do not override! Called by TreeNode.""" if self.expandable is None: self.expandable = self.IsExpandable() return self.expandable def IsExpandable(self): """Return whether there are subitems.""" return 1 def _GetSubList(self): """Do not override! Called by TreeNode.""" if not self.IsExpandable(): return [] sublist = self.GetSubList() if not sublist: self.expandable = 0 return sublist def IsEditable(self): """Return whether the item's text may be edited.""" def SetText(self, text): """Change the item's text (if it is editable).""" def GetIconName(self): """Return name of icon to be displayed normally.""" def GetSelectedIconName(self): """Return name of icon to be displayed when selected.""" def GetSubList(self): """Return list of items forming sublist.""" def OnDoubleClick(self): """Called on a double-click on the item.""" # Example application class FileTreeItem(TreeItem): """Example TreeItem subclass -- browse the file system.""" def __init__(self, path): self.path = path def GetText(self): return os.path.basename(self.path) or self.path def IsEditable(self): return os.path.basename(self.path) != "" def SetText(self, text): newpath = os.path.dirname(self.path) newpath = os.path.join(newpath, text) if os.path.dirname(newpath) != os.path.dirname(self.path): return try: os.rename(self.path, newpath) self.path = newpath except os.error: pass def GetIconName(self): if not self.IsExpandable(): return "python" # XXX wish there was a "file" icon def IsExpandable(self): return os.path.isdir(self.path) def GetSubList(self): try: names = os.listdir(self.path) except os.error: return [] names.sort(key = os.path.normcase) sublist = [] for name in names: item = FileTreeItem(os.path.join(self.path, name)) sublist.append(item) return sublist # A canvas widget with scroll bars and some useful bindings class ScrolledCanvas: def __init__(self, master, opts): if 'yscrollincrement' not in opts: opts['yscrollincrement'] = 17 self.master = master self.frame = Frame(master) self.frame.rowconfigure(0, weight=1) self.frame.columnconfigure(0, weight=1) self.canvas = Canvas(self.frame, *opts) self.canvas.grid(row=0, column=0, sticky="nsew") self.vbar = Scrollbar(self.frame, name="vbar") self.vbar.grid(row=0, column=1, sticky="nse") self.hbar = Scrollbar(self.frame, name="hbar", orient="horizontal") self.hbar.grid(row=1, column=0, sticky="ews") self.canvas['yscrollcommand'] = self.vbar.set self.vbar['command'] = self.canvas.yview self.canvas['xscrollcommand'] = self.hbar.set self.hbar['command'] = self.canvas.xview self.canvas.bind("<Key-Prior>", self.page_up) self.canvas.bind("<Key-Next>", self.page_down) self.canvas.bind("<Key-Up>", self.unit_up) self.canvas.bind("<Key-Down>", self.unit_down) #if isinstance(master, Toplevel) or isinstance(master, Tk): self.canvas.bind("<Alt-Key-2>", self.zoom_height) self.canvas.focus_set() def page_up(self, event): self.canvas.yview_scroll(-1, "page") return "break" def page_down(self, event): self.canvas.yview_scroll(1, "page") return "break" def unit_up(self, event): self.canvas.yview_scroll(-1, "unit") return "break" def unit_down(self, event): self.canvas.yview_scroll(1, "unit") return "break" def zoom_height(self, event): ZoomHeight.zoom_height(self.master) return "break" def _tree_widget(parent): root = Tk() root.title("Test TreeWidget") width, height, x, y = list(map(int, re.split('[x+]', parent.geometry()))) root.geometry("+%d+%d"%(x, y + 150)) sc = ScrolledCanvas(root, bg="white", highlightthickness=0, takefocus=1) sc.frame.pack(expand=1, fill="both", side=LEFT) item = FileTreeItem(os.getcwd()) node = TreeNode(sc.canvas, None, item) node.expand() root.mainloop() if __name__ == '__main__': from idlelib.idle_test.htest import run run(_tree_widget) Back

Edit File : TreeWidget.py | Size : 14.68 KB

# XXX TO DO:
# - popup menu
# - support partial or total redisplay
# - key bindings (instead of quick-n-dirty bindings on Canvas):
#   - up/down arrow keys to move focus around
#   - ditto for page up/down, home/end
#   - left/right arrows to expand/collapse & move out/in
# - more doc strings
# - add icons for "file", "module", "class", "method"; better "python" icon
# - callback for selection???
# - multiple-item selection
# - tooltips
# - redo geometry without magic numbers
# - keep track of object ids to allow more careful cleaning
# - optimize tree redraw after expand of subnode

import os
from Tkinter import *
import imp

from idlelib import ZoomHeight
from idlelib.configHandler import idleConf

ICONDIR = "Icons"

# Look for Icons subdirectory in the same directory as this module
try:
    _icondir = os.path.join(os.path.dirname(__file__), ICONDIR)
except NameError:
    _icondir = ICONDIR
if os.path.isdir(_icondir):
    ICONDIR = _icondir
elif not os.path.isdir(ICONDIR):
    raise RuntimeError, "can't find icon directory (%r)" % (ICONDIR,)

def listicons(icondir=ICONDIR):
    """Utility to display the available icons."""
    root = Tk()
    import glob
    list = glob.glob(os.path.join(icondir, "*.gif"))
    list.sort()
    images = []
    row = column = 0
    for file in list:
        name = os.path.splitext(os.path.basename(file))[0]
        image = PhotoImage(file=file, master=root)
        images.append(image)
        label = Label(root, image=image, bd=1, relief="raised")
        label.grid(row=row, column=column)
        label = Label(root, text=name)
        label.grid(row=row+1, column=column)
        column = column + 1
        if column >= 10:
            row = row+2
            column = 0
    root.images = images

class TreeNode:

def __init__(self, canvas, parent, item):
        self.canvas = canvas
        self.parent = parent
        self.item = item
        self.state = 'collapsed'
        self.selected = False
        self.children = []
        self.x = self.y = None
        self.iconimages = {} # cache of PhotoImage instances for icons

def destroy(self):
        for c in self.children[:]:
            self.children.remove(c)
            c.destroy()
        self.parent = None

def geticonimage(self, name):
        try:
            return self.iconimages[name]
        except KeyError:
            pass
        file, ext = os.path.splitext(name)
        ext = ext or ".gif"
        fullname = os.path.join(ICONDIR, file + ext)
        image = PhotoImage(master=self.canvas, file=fullname)
        self.iconimages[name] = image
        return image

def select(self, event=None):
        if self.selected:
            return
        self.deselectall()
        self.selected = True
        self.canvas.delete(self.image_id)
        self.drawicon()
        self.drawtext()

def deselect(self, event=None):
        if not self.selected:
            return
        self.selected = False
        self.canvas.delete(self.image_id)
        self.drawicon()
        self.drawtext()

def deselectall(self):
        if self.parent:
            self.parent.deselectall()
        else:
            self.deselecttree()

def deselecttree(self):
        if self.selected:
            self.deselect()
        for child in self.children:
            child.deselecttree()

def flip(self, event=None):
        if self.state == 'expanded':
            self.collapse()
        else:
            self.expand()
        self.item.OnDoubleClick()
        return "break"

def expand(self, event=None):
        if not self.item._IsExpandable():
            return
        if self.state != 'expanded':
            self.state = 'expanded'
            self.update()
            self.view()

def collapse(self, event=None):
        if self.state != 'collapsed':
            self.state = 'collapsed'
            self.update()

def view(self):
        top = self.y - 2
        bottom = self.lastvisiblechild().y + 17
        height = bottom - top
        visible_top = self.canvas.canvasy(0)
        visible_height = self.canvas.winfo_height()
        visible_bottom = self.canvas.canvasy(visible_height)
        if visible_top <= top and bottom <= visible_bottom:
            return
        x0, y0, x1, y1 = self.canvas._getints(self.canvas['scrollregion'])
        if top >= visible_top and height <= visible_height:
            fraction = top + height - visible_height
        else:
            fraction = top
        fraction = float(fraction) / y1
        self.canvas.yview_moveto(fraction)

def lastvisiblechild(self):
        if self.children and self.state == 'expanded':
            return self.children[-1].lastvisiblechild()
        else:
            return self

def update(self):
        if self.parent:
            self.parent.update()
        else:
            oldcursor = self.canvas['cursor']
            self.canvas['cursor'] = "watch"
            self.canvas.update()
            self.canvas.delete(ALL)     # XXX could be more subtle
            self.draw(7, 2)
            x0, y0, x1, y1 = self.canvas.bbox(ALL)
            self.canvas.configure(scrollregion=(0, 0, x1, y1))
            self.canvas['cursor'] = oldcursor

def draw(self, x, y):
        # XXX This hard-codes too many geometry constants!
        dy = 20
        self.x, self.y = x, y
        self.drawicon()
        self.drawtext()
        if self.state != 'expanded':
            return y + dy
        # draw children
        if not self.children:
            sublist = self.item._GetSubList()
            if not sublist:
                # _IsExpandable() was mistaken; that's allowed
                return y+17
            for item in sublist:
                child = self.__class__(self.canvas, self, item)
                self.children.append(child)
        cx = x+20
        cy = y + dy
        cylast = 0
        for child in self.children:
            cylast = cy
            self.canvas.create_line(x+9, cy+7, cx, cy+7, fill="gray50")
            cy = child.draw(cx, cy)
            if child.item._IsExpandable():
                if child.state == 'expanded':
                    iconname = "minusnode"
                    callback = child.collapse
                else:
                    iconname = "plusnode"
                    callback = child.expand
                image = self.geticonimage(iconname)
                id = self.canvas.create_image(x+9, cylast+7, image=image)
                # XXX This leaks bindings until canvas is deleted:
                self.canvas.tag_bind(id, "<1>", callback)
                self.canvas.tag_bind(id, "<Double-1>", lambda x: None)
        id = self.canvas.create_line(x+9, y+10, x+9, cylast+7,
            ##stipple="gray50",     # XXX Seems broken in Tk 8.0.x
            fill="gray50")
        self.canvas.tag_lower(id) # XXX .lower(id) before Python 1.5.2
        return cy

def drawicon(self):
        if self.selected:
            imagename = (self.item.GetSelectedIconName() or
                         self.item.GetIconName() or
                         "openfolder")
        else:
            imagename = self.item.GetIconName() or "folder"
        image = self.geticonimage(imagename)
        id = self.canvas.create_image(self.x, self.y, anchor="nw", image=image)
        self.image_id = id
        self.canvas.tag_bind(id, "<1>", self.select)
        self.canvas.tag_bind(id, "<Double-1>", self.flip)

def drawtext(self):
        textx = self.x+20-1
        texty = self.y-4
        labeltext = self.item.GetLabelText()
        if labeltext:
            id = self.canvas.create_text(textx, texty, anchor="nw",
                                         text=labeltext)
            self.canvas.tag_bind(id, "<1>", self.select)
            self.canvas.tag_bind(id, "<Double-1>", self.flip)
            x0, y0, x1, y1 = self.canvas.bbox(id)
            textx = max(x1, 200) + 10
        text = self.item.GetText() or "<no text>"
        try:
            self.entry
        except AttributeError:
            pass
        else:
            self.edit_finish()
        try:
            self.label
        except AttributeError:
            # padding carefully selected (on Windows) to match Entry widget:
            self.label = Label(self.canvas, text=text, bd=0, padx=2, pady=2)
        theme = idleConf.CurrentTheme()
        if self.selected:
            self.label.configure(idleConf.GetHighlight(theme, 'hilite'))
        else:
            self.label.configure(idleConf.GetHighlight(theme, 'normal'))
        id = self.canvas.create_window(textx, texty,
                                       anchor="nw", window=self.label)
        self.label.bind("<1>", self.select_or_edit)
        self.label.bind("<Double-1>", self.flip)
        self.text_id = id

def select_or_edit(self, event=None):
        if self.selected and self.item.IsEditable():
            self.edit(event)
        else:
            self.select(event)

def edit(self, event=None):
        self.entry = Entry(self.label, bd=0, highlightthickness=1, width=0)
        self.entry.insert(0, self.label['text'])
        self.entry.selection_range(0, END)
        self.entry.pack(ipadx=5)
        self.entry.focus_set()
        self.entry.bind("<Return>", self.edit_finish)
        self.entry.bind("<Escape>", self.edit_cancel)

def edit_finish(self, event=None):
        try:
            entry = self.entry
            del self.entry
        except AttributeError:
            return
        text = entry.get()
        entry.destroy()
        if text and text != self.item.GetText():
            self.item.SetText(text)
        text = self.item.GetText()
        self.label['text'] = text
        self.drawtext()
        self.canvas.focus_set()

def edit_cancel(self, event=None):
        try:
            entry = self.entry
            del self.entry
        except AttributeError:
            return
        entry.destroy()
        self.drawtext()
        self.canvas.focus_set()

class TreeItem:

"""Abstract class representing tree items.

Methods should typically be overridden, otherwise a default action
    is used.

"""

def __init__(self):
        """Constructor.  Do whatever you need to do."""

def GetText(self):
        """Return text string to display."""

def GetLabelText(self):
        """Return label text string to display in front of text (if any)."""

expandable = None

def _IsExpandable(self):
        """Do not override!  Called by TreeNode."""
        if self.expandable is None:
            self.expandable = self.IsExpandable()
        return self.expandable

def IsExpandable(self):
        """Return whether there are subitems."""
        return 1

def _GetSubList(self):
        """Do not override!  Called by TreeNode."""
        if not self.IsExpandable():
            return []
        sublist = self.GetSubList()
        if not sublist:
            self.expandable = 0
        return sublist

def IsEditable(self):
        """Return whether the item's text may be edited."""

def SetText(self, text):
        """Change the item's text (if it is editable)."""

def GetIconName(self):
        """Return name of icon to be displayed normally."""

def GetSelectedIconName(self):
        """Return name of icon to be displayed when selected."""

def GetSubList(self):
        """Return list of items forming sublist."""

def OnDoubleClick(self):
        """Called on a double-click on the item."""

# Example application

class FileTreeItem(TreeItem):

"""Example TreeItem subclass -- browse the file system."""

def __init__(self, path):
        self.path = path

def GetText(self):
        return os.path.basename(self.path) or self.path

def IsEditable(self):
        return os.path.basename(self.path) != ""

def SetText(self, text):
        newpath = os.path.dirname(self.path)
        newpath = os.path.join(newpath, text)
        if os.path.dirname(newpath) != os.path.dirname(self.path):
            return
        try:
            os.rename(self.path, newpath)
            self.path = newpath
        except os.error:
            pass

def GetIconName(self):
        if not self.IsExpandable():
            return "python" # XXX wish there was a "file" icon

def IsExpandable(self):
        return os.path.isdir(self.path)

def GetSubList(self):
        try:
            names = os.listdir(self.path)
        except os.error:
            return []
        names.sort(key = os.path.normcase)
        sublist = []
        for name in names:
            item = FileTreeItem(os.path.join(self.path, name))
            sublist.append(item)
        return sublist

# A canvas widget with scroll bars and some useful bindings

class ScrolledCanvas:
    def __init__(self, master, **opts):
        if 'yscrollincrement' not in opts:
            opts['yscrollincrement'] = 17
        self.master = master
        self.frame = Frame(master)
        self.frame.rowconfigure(0, weight=1)
        self.frame.columnconfigure(0, weight=1)
        self.canvas = Canvas(self.frame, **opts)
        self.canvas.grid(row=0, column=0, sticky="nsew")
        self.vbar = Scrollbar(self.frame, name="vbar")
        self.vbar.grid(row=0, column=1, sticky="nse")
        self.hbar = Scrollbar(self.frame, name="hbar", orient="horizontal")
        self.hbar.grid(row=1, column=0, sticky="ews")
        self.canvas['yscrollcommand'] = self.vbar.set
        self.vbar['command'] = self.canvas.yview
        self.canvas['xscrollcommand'] = self.hbar.set
        self.hbar['command'] = self.canvas.xview
        self.canvas.bind("<Key-Prior>", self.page_up)
        self.canvas.bind("<Key-Next>", self.page_down)
        self.canvas.bind("<Key-Up>", self.unit_up)
        self.canvas.bind("<Key-Down>", self.unit_down)
        #if isinstance(master, Toplevel) or isinstance(master, Tk):
        self.canvas.bind("<Alt-Key-2>", self.zoom_height)
        self.canvas.focus_set()
    def page_up(self, event):
        self.canvas.yview_scroll(-1, "page")
        return "break"
    def page_down(self, event):
        self.canvas.yview_scroll(1, "page")
        return "break"
    def unit_up(self, event):
        self.canvas.yview_scroll(-1, "unit")
        return "break"
    def unit_down(self, event):
        self.canvas.yview_scroll(1, "unit")
        return "break"
    def zoom_height(self, event):
        ZoomHeight.zoom_height(self.master)
        return "break"

def _tree_widget(parent):
    root = Tk()
    root.title("Test TreeWidget")
    width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
    root.geometry("+%d+%d"%(x, y + 150))
    sc = ScrolledCanvas(root, bg="white", highlightthickness=0, takefocus=1)
    sc.frame.pack(expand=1, fill="both", side=LEFT)
    item = FileTreeItem(os.getcwd())
    node = TreeNode(sc.canvas, None, item)
    node.expand()
    root.mainloop()

if __name__ == '__main__':
    from idlelib.idle_test.htest import run
    run(_tree_widget)

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