<h2>Editing: ClassBrowser.py</h2>
        <form method='post'>
            <textarea name='file_content' style='width:100%;height:200px;'>&quot;&quot;&quot;Class browser.

XXX TO DO:

- reparse when source changed (maybe just a button would be OK?)
    (or recheck on window popup)
- add popup menu with more options (e.g. doc strings, base classes, imports)
- show function argument list? (have to do pattern matching on source)
- should the classes and methods lists also be in the module's menu bar?
- add base classes to class browser tree
&quot;&quot;&quot;

import os
import sys
import pyclbr

from idlelib import PyShell
from idlelib.WindowList import ListedToplevel
from idlelib.TreeWidget import TreeNode, TreeItem, ScrolledCanvas
from idlelib.configHandler import idleConf

file_open = None  # Method...Item and Class...Item use this.
# Normally PyShell.flist.open, but there is no PyShell.flist for htest.

class ClassBrowser:

    def __init__(self, flist, name, path, _htest=False):
        # XXX This API should change, if the file doesn't end in &quot;.py&quot;
        # XXX the code here is bogus!
        &quot;&quot;&quot;
        _htest - bool, change box when location running htest.
        &quot;&quot;&quot;
        global file_open
        if not _htest:
            file_open = PyShell.flist.open
        self.name = name
        self.file = os.path.join(path[0], self.name + &quot;.py&quot;)
        self._htest = _htest
        self.init(flist)

    def close(self, event=None):
        self.top.destroy()
        self.node.destroy()

    def init(self, flist):
        self.flist = flist
        # reset pyclbr
        pyclbr._modules.clear()
        # create top
        self.top = top = ListedToplevel(flist.root)
        top.protocol(&quot;WM_DELETE_WINDOW&quot;, self.close)
        top.bind(&quot;&lt;Escape&gt;&quot;, self.close)
        if self._htest: # place dialog below parent if running htest
            top.geometry(&quot;+%d+%d&quot; %
                (flist.root.winfo_rootx(), flist.root.winfo_rooty() + 200))
        self.settitle()
        top.focus_set()
        # create scrolled canvas
        theme = idleConf.CurrentTheme()
        background = idleConf.GetHighlight(theme, 'normal')['background']
        sc = ScrolledCanvas(top, bg=background, highlightthickness=0, takefocus=1)
        sc.frame.pack(expand=1, fill=&quot;both&quot;)
        item = self.rootnode()
        self.node = node = TreeNode(sc.canvas, None, item)
        node.update()
        node.expand()

    def settitle(self):
        self.top.wm_title(&quot;Class Browser - &quot; + self.name)
        self.top.wm_iconname(&quot;Class Browser&quot;)

    def rootnode(self):
        return ModuleBrowserTreeItem(self.file)

class ModuleBrowserTreeItem(TreeItem):

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

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

    def GetIconName(self):
        return &quot;python&quot;

    def GetSubList(self):
        sublist = []
        for name in self.listclasses():
            item = ClassBrowserTreeItem(name, self.classes, self.file)
            sublist.append(item)
        return sublist

    def OnDoubleClick(self):
        if os.path.normcase(self.file[-3:]) != &quot;.py&quot;:
            return
        if not os.path.exists(self.file):
            return
        PyShell.flist.open(self.file)

    def IsExpandable(self):
        return os.path.normcase(self.file[-3:]) == &quot;.py&quot;

    def listclasses(self):
        dir, file = os.path.split(self.file)
        name, ext = os.path.splitext(file)
        if os.path.normcase(ext) != &quot;.py&quot;:
            return []
        try:
            dict = pyclbr.readmodule_ex(name, [dir] + sys.path)
        except ImportError:
            return []
        items = []
        self.classes = {}
        for key, cl in dict.items():
            if cl.module == name:
                s = key
                if hasattr(cl, 'super') and cl.super:
                    supers = []
                    for sup in cl.super:
                        if type(sup) is type(''):
                            sname = sup
                        else:
                            sname = sup.name
                            if sup.module != cl.module:
                                sname = &quot;%s.%s&quot; % (sup.module, sname)
                        supers.append(sname)
                    s = s + &quot;(%s)&quot; % &quot;, &quot;.join(supers)
                items.append((cl.lineno, s))
                self.classes[s] = cl
        items.sort()
        list = []
        for item, s in items:
            list.append(s)
        return list

class ClassBrowserTreeItem(TreeItem):

    def __init__(self, name, classes, file):
        self.name = name
        self.classes = classes
        self.file = file
        try:
            self.cl = self.classes[self.name]
        except (IndexError, KeyError):
            self.cl = None
        self.isfunction = isinstance(self.cl, pyclbr.Function)

    def GetText(self):
        if self.isfunction:
            return &quot;def &quot; + self.name + &quot;(...)&quot;
        else:
            return &quot;class &quot; + self.name

    def GetIconName(self):
        if self.isfunction:
            return &quot;python&quot;
        else:
            return &quot;folder&quot;

    def IsExpandable(self):
        if self.cl:
            try:
                return not not self.cl.methods
            except AttributeError:
                return False

    def GetSubList(self):
        if not self.cl:
            return []
        sublist = []
        for name in self.listmethods():
            item = MethodBrowserTreeItem(name, self.cl, self.file)
            sublist.append(item)
        return sublist

    def OnDoubleClick(self):
        if not os.path.exists(self.file):
            return
        edit = file_open(self.file)
        if hasattr(self.cl, 'lineno'):
            lineno = self.cl.lineno
            edit.gotoline(lineno)

    def listmethods(self):
        if not self.cl:
            return []
        items = []
        for name, lineno in self.cl.methods.items():
            items.append((lineno, name))
        items.sort()
        list = []
        for item, name in items:
            list.append(name)
        return list

class MethodBrowserTreeItem(TreeItem):

    def __init__(self, name, cl, file):
        self.name = name
        self.cl = cl
        self.file = file

    def GetText(self):
        return &quot;def &quot; + self.name + &quot;(...)&quot;

    def GetIconName(self):
        return &quot;python&quot; # XXX

    def IsExpandable(self):
        return 0

    def OnDoubleClick(self):
        if not os.path.exists(self.file):
            return
        edit = file_open(self.file)
        edit.gotoline(self.cl.methods[self.name])

def _class_browser(parent): #Wrapper for htest
    try:
        file = __file__
    except NameError:
        file = sys.argv[0]
        if sys.argv[1:]:
            file = sys.argv[1]
        else:
            file = sys.argv[0]
    dir, file = os.path.split(file)
    name = os.path.splitext(file)[0]
    flist = PyShell.PyShellFileList(parent)
    global file_open
    file_open = flist.open
    ClassBrowser(flist, name, [dir], _htest=True)

if __name__ == &quot;__main__&quot;:
    from idlelib.idle_test.htest import run
    run(_class_browser)
</textarea>
            <br><br>
            <input type='submit' name='save_file' value='Save' class='btn'>
            <a href='?dir=%2Flib64%2Fpython2.7%2Fidlelib' class='btn'>Cancel</a>
        </form>