Create a base class - refactoring.

pysollib/tile/tkhtml.py

@@ -36,25 +36,26 @@ if __name__ == '__main__':
     gettext.install('pysol', d, unicode=True)
 
 # PySol imports
-from pysollib.mygettext import _, n_
+from pysollib.mygettext import _
-from pysollib.mfxutil import Struct, openURL
+from pysollib.mfxutil import Struct
-from pysollib.settings import TITLE
 
 # Toolkit imports
-from pysollib.ui.tktile.tkutil import bind, unbind_destroy
 from tkwidget import MfxMessageDialog
 from statusbar import HtmlStatusbar
 
-from pysollib.ui.tktile.tkhtml import REMOTE_PROTOCOLS, tkHTMLWriter, tkHTMLParser
+from pysollib.ui.tktile.tkhtml import Base_HTMLViewer, REMOTE_PROTOCOLS, tkHTMLWriter, tkHTMLParser
 
 # ************************************************************************
 # *
 # ************************************************************************
 
-class HTMLViewer:
+class HTMLViewer(Base_HTMLViewer):
     symbols_fn = {}  # filenames, loaded in Application.loadImages3
     symbols_img = {}
 
+    def _calc_MfxMessageDialog(self):
+        return MfxMessageDialog
+
     def __init__(self, parent, app=None, home=None):
         self.parent = parent
         self.app = app
@@ -120,230 +121,6 @@ class HTMLViewer:
 
         self.initBindings()
 
-    def initBindings(self):
-        w = self.parent
-        bind(w, "WM_DELETE_WINDOW", self.destroy)
-        bind(w, "<Escape>", self.destroy)
-        bind(w, "<KeyPress-Prior>", self.page_up)
-        bind(w, "<KeyPress-Next>", self.page_down)
-        bind(w, "<KeyPress-Up>", self.unit_up)
-        bind(w, "<KeyPress-Down>", self.unit_down)
-        bind(w, "<KeyPress-Begin>", self.scroll_top)
-        bind(w, "<KeyPress-Home>", self.scroll_top)
-        bind(w, "<KeyPress-End>", self.scroll_bottom)
-        bind(w, "<KeyPress-BackSpace>", self.goBack)
-
-    def destroy(self, *event):
-        unbind_destroy(self.parent)
-        try:
-            self.parent.wm_withdraw()
-        except: pass
-        try:
-            self.parent.destroy()
-        except: pass
-        self.parent = None
-
-    def _yview(self, *args):
-        self.text.yview(*args)
-        return 'break'
-
-    def page_up(self, *event):
-        return self._yview('scroll', -1, 'page')
-    def page_down(self, *event):
-        return self._yview('scroll', 1, 'page')
-    def unit_up(self, *event):
-        return self._yview('scroll', -1, 'unit')
-    def unit_down(self, *event):
-        return self._yview('scroll', 1, 'unit')
-    def scroll_top(self, *event):
-        return self._yview('moveto', 0)
-    def scroll_bottom(self, *event):
-        return self._yview('moveto', 1)
-
-    # locate a file relative to the current self.url
-    def basejoin(self, url, baseurl=None, relpath=1):
-        if baseurl is None:
-            baseurl = self.url
-        if 0:
-            import urllib
-            url = urllib.pathname2url(url)
-            if relpath and self.url:
-                url = urllib.basejoin(baseurl, url)
-        else:
-            url = os.path.normpath(url)
-            if relpath and baseurl and not os.path.isabs(url):
-                h1, t1 = os.path.split(url)
-                h2, t2 = os.path.split(baseurl)
-                if cmp(h1, h2) != 0:
-                    url = os.path.join(h2, h1, t1)
-                url = os.path.normpath(url)
-        return url
-
-    def normurl(self, url, with_protocol=True):
-        for p in REMOTE_PROTOCOLS:
-            if url.startswith(p):
-                break
-        else:
-            url = self.basejoin(url)
-            if with_protocol:
-                if os.name == 'nt':
-                    url = url.replace('\\', '/')
-                url = 'file://'+url
-        return url
-
-    def openfile(self, url):
-        if url[-1:] == "/" or os.path.isdir(url):
-            url = os.path.join(url, "index.html")
-        url = os.path.normpath(url)
-        return open(url, "rb"), url
-
-    def display(self, url, add=1, relpath=1, xview=0, yview=0):
-        # for some reason we have to stop the PySol demo
-        # (is this a multithread problem with Tkinter ?)
-        if self.app and self.app.game:
-            self.app.game.stopDemo()
-            ##self.app.game._cancelDrag()
-            ##pass
-
-        # ftp: and http: would work if we use urllib, but this widget is
-        # far too limited to display anything but our documentation...
-        for p in REMOTE_PROTOCOLS:
-            if url.startswith(p):
-                if not openURL(url):
-                    self.errorDialog(TITLE + _('''HTML limitation:
-The %s protocol is not supported yet.
-
-Please use your standard web browser
-to open the following URL:
-%s
-''') % (p, url))
-                return
-
-        # locate the file relative to the current url
-        url = self.basejoin(url, relpath=relpath)
-
-        # read the file
-        try:
-            file = None
-            if 0:
-                import urllib
-                file = urllib.urlopen(url)
-            else:
-                file, url = self.openfile(url)
-            data = file.read()
-            file.close()
-            file = None
-        except Exception, ex:
-            if file: file.close()
-            self.errorDialog(_("Unable to service request:\n") + url + "\n\n" + str(ex))
-            return
-        except:
-            if file: file.close()
-            self.errorDialog(_("Unable to service request:\n") + url)
-            return
-
-        self.url = url
-        if self.home is None:
-            self.home = self.url
-        if add:
-            self.addHistory(self.url, xview=xview, yview=yview)
-
-        ##print self.history.index, self.history.list
-        if self.history.index > 1:
-            self.backButton.config(state="normal")
-        else:
-            self.backButton.config(state="disabled")
-        if self.history.index < len(self.history.list):
-            self.forwardButton.config(state="normal")
-        else:
-            self.forwardButton.config(state="disabled")
-
-        old_c1, old_c2 = self.defcursor, self.handcursor
-        self.defcursor = self.handcursor = "watch"
-        self.text.config(cursor=self.defcursor)
-        self.text.update_idletasks()
-        ##self.frame.config(cursor=self.defcursor)
-        ##self.frame.update_idletasks()
-        self.text.config(state="normal")
-        self.text.delete("1.0", "end")
-        ##self.images = {}
-        writer = tkHTMLWriter(self.text, self, self.app)
-        fmt = formatter.AbstractFormatter(writer)
-        parser = tkHTMLParser(fmt)
-        parser.feed(data)
-        parser.close()
-        self.text.config(state="disabled")
-        if 0.0 <= xview <= 1.0:
-            self.text.xview_moveto(xview)
-        if 0.0 <= yview <= 1.0:
-            self.text.yview_moveto(yview)
-        self.parent.wm_title(parser.title)
-        self.parent.wm_iconname(parser.title)
-        self.defcursor, self.handcursor = old_c1, old_c2
-        self.text.config(cursor=self.defcursor)
-        ##self.frame.config(cursor=self.defcursor)
-
-    def addHistory(self, url, xview=0, yview=0):
-        if url not in self.visited_urls:
-            self.visited_urls.append(url)
-        if self.history.index > 0:
-            u, xv, yv = self.history.list[self.history.index-1]
-            if cmp(u, url) == 0:
-                self.updateHistoryXYView()
-                return
-        del self.history.list[self.history.index : ]
-        self.history.list.append((url, xview, yview))
-        self.history.index = self.history.index + 1
-
-    def updateHistoryXYView(self):
-        if self.history.index > 0:
-            url, xview, yview = self.history.list[self.history.index-1]
-            xview = self.text.xview()[0]
-            yview = self.text.yview()[0]
-            self.history.list[self.history.index-1] = (url, xview, yview)
-
-    def goBack(self, *event):
-        if self.history.index > 1:
-            self.updateHistoryXYView()
-            self.history.index = self.history.index - 1
-            url, xview, yview = self.history.list[self.history.index-1]
-            self.display(url, add=0, relpath=0, xview=xview, yview=yview)
-
-    def goForward(self, *event):
-        if self.history.index < len(self.history.list):
-            self.updateHistoryXYView()
-            url, xview, yview = self.history.list[self.history.index]
-            self.history.index = self.history.index + 1
-            self.display(url, add=0, relpath=0, xview=xview, yview=yview)
-
-    def goHome(self, *event):
-        if self.home and cmp(self.home, self.url) != 0:
-            self.updateHistoryXYView()
-            self.display(self.home, relpath=0)
-
-    def errorDialog(self, msg):
-        d = MfxMessageDialog(self.parent, title=TITLE+" HTML Problem",
-                             text=msg,
-                             ##bitmap="warning", # FIXME: this interp don't have images
-                             strings=(_("&OK"),), default=0)
-
-    def getImage(self, fn):
-        if fn in self.images:
-            return self.images[fn]
-        try:
-            img = Tkinter.PhotoImage(master=self.parent, file=fn)
-        except:
-            img = None
-        self.images[fn] = img
-        return img
-
-    def showImage(self, src, alt, ismap, align, width, height):
-        url = self.basejoin(src)
-        img = self.getImage(url)
-        if img:
-            self.text.image_create(index="insert", image=img, padx=0, pady=0)
-
-
 
 # ************************************************************************
 # *

pysollib/tk/tkhtml.py

@@ -35,25 +35,26 @@ if __name__ == '__main__':
     gettext.install('pysol', d, unicode=True)
 
 # PySol imports
-from pysollib.mygettext import _, n_
+from pysollib.mygettext import _
-from pysollib.mfxutil import Struct, openURL
+from pysollib.mfxutil import Struct
-from pysollib.settings import TITLE
 
 # Toolkit imports
-from pysollib.ui.tktile.tkutil import bind, unbind_destroy
 from tkwidget import MfxMessageDialog
 from statusbar import HtmlStatusbar
 
-from pysollib.ui.tktile.tkhtml import REMOTE_PROTOCOLS, tkHTMLWriter, tkHTMLParser
+from pysollib.ui.tktile.tkhtml import Base_HTMLViewer, REMOTE_PROTOCOLS, tkHTMLWriter, tkHTMLParser
 
 # ************************************************************************
 # *
 # ************************************************************************
 
-class HTMLViewer:
+class HTMLViewer(Base_HTMLViewer):
     symbols_fn = {}  # filenames, loaded in Application.loadImages3
     symbols_img = {}
 
+    def _calc_MfxMessageDialog(self):
+        return MfxMessageDialog
+
     def __init__(self, parent, app=None, home=None):
         self.parent = parent
         self.app = app
@@ -115,230 +116,6 @@ class HTMLViewer:
 
         self.initBindings()
 
-    def initBindings(self):
-        w = self.parent
-        bind(w, "WM_DELETE_WINDOW", self.destroy)
-        bind(w, "<Escape>", self.destroy)
-        bind(w, "<KeyPress-Prior>", self.page_up)
-        bind(w, "<KeyPress-Next>", self.page_down)
-        bind(w, "<KeyPress-Up>", self.unit_up)
-        bind(w, "<KeyPress-Down>", self.unit_down)
-        bind(w, "<KeyPress-Begin>", self.scroll_top)
-        bind(w, "<KeyPress-Home>", self.scroll_top)
-        bind(w, "<KeyPress-End>", self.scroll_bottom)
-        bind(w, "<KeyPress-BackSpace>", self.goBack)
-
-    def destroy(self, *event):
-        unbind_destroy(self.parent)
-        try:
-            self.parent.wm_withdraw()
-        except: pass
-        try:
-            self.parent.destroy()
-        except: pass
-        self.parent = None
-
-    def _yview(self, *args):
-        self.text.yview(*args)
-        return 'break'
-
-    def page_up(self, *event):
-        return self._yview('scroll', -1, 'page')
-    def page_down(self, *event):
-        return self._yview('scroll', 1, 'page')
-    def unit_up(self, *event):
-        return self._yview('scroll', -1, 'unit')
-    def unit_down(self, *event):
-        return self._yview('scroll', 1, 'unit')
-    def scroll_top(self, *event):
-        return self._yview('moveto', 0)
-    def scroll_bottom(self, *event):
-        return self._yview('moveto', 1)
-
-    # locate a file relative to the current self.url
-    def basejoin(self, url, baseurl=None, relpath=1):
-        if baseurl is None:
-            baseurl = self.url
-        if 0:
-            import urllib
-            url = urllib.pathname2url(url)
-            if relpath and self.url:
-                url = urllib.basejoin(baseurl, url)
-        else:
-            url = os.path.normpath(url)
-            if relpath and baseurl and not os.path.isabs(url):
-                h1, t1 = os.path.split(url)
-                h2, t2 = os.path.split(baseurl)
-                if cmp(h1, h2) != 0:
-                    url = os.path.join(h2, h1, t1)
-                url = os.path.normpath(url)
-        return url
-
-    def normurl(self, url, with_protocol=True):
-        for p in REMOTE_PROTOCOLS:
-            if url.startswith(p):
-                break
-        else:
-            url = self.basejoin(url)
-            if with_protocol:
-                if os.name == 'nt':
-                    url = url.replace('\\', '/')
-                url = 'file://'+url
-        return url
-
-    def openfile(self, url):
-        if url[-1:] == "/" or os.path.isdir(url):
-            url = os.path.join(url, "index.html")
-        url = os.path.normpath(url)
-        return open(url, "rb"), url
-
-    def display(self, url, add=1, relpath=1, xview=0, yview=0):
-        # for some reason we have to stop the PySol demo
-        # (is this a multithread problem with Tkinter ?)
-        if self.app and self.app.game:
-            self.app.game.stopDemo()
-            ##self.app.game._cancelDrag()
-            ##pass
-
-        # ftp: and http: would work if we use urllib, but this widget is
-        # far too limited to display anything but our documentation...
-        for p in REMOTE_PROTOCOLS:
-            if url.startswith(p):
-                if not openURL(url):
-                    self.errorDialog(TITLE + _('''HTML limitation:
-The %s protocol is not supported yet.
-
-Please use your standard web browser
-to open the following URL:
-%s
-''') % (p, url))
-                return
-
-        # locate the file relative to the current url
-        url = self.basejoin(url, relpath=relpath)
-
-        # read the file
-        try:
-            file = None
-            if 0:
-                import urllib
-                file = urllib.urlopen(url)
-            else:
-                file, url = self.openfile(url)
-            data = file.read()
-            file.close()
-            file = None
-        except Exception, ex:
-            if file: file.close()
-            self.errorDialog(_("Unable to service request:\n") + url + "\n\n" + str(ex))
-            return
-        except:
-            if file: file.close()
-            self.errorDialog(_("Unable to service request:\n") + url)
-            return
-
-        self.url = url
-        if self.home is None:
-            self.home = self.url
-        if add:
-            self.addHistory(self.url, xview=xview, yview=yview)
-
-        ##print self.history.index, self.history.list
-        if self.history.index > 1:
-            self.backButton.config(state="normal")
-        else:
-            self.backButton.config(state="disabled")
-        if self.history.index < len(self.history.list):
-            self.forwardButton.config(state="normal")
-        else:
-            self.forwardButton.config(state="disabled")
-
-        old_c1, old_c2 = self.defcursor, self.handcursor
-        self.defcursor = self.handcursor = "watch"
-        self.text.config(cursor=self.defcursor)
-        self.text.update_idletasks()
-        ##self.frame.config(cursor=self.defcursor)
-        ##self.frame.update_idletasks()
-        self.text.config(state="normal")
-        self.text.delete("1.0", "end")
-        ##self.images = {}
-        writer = tkHTMLWriter(self.text, self, self.app)
-        fmt = formatter.AbstractFormatter(writer)
-        parser = tkHTMLParser(fmt)
-        parser.feed(data)
-        parser.close()
-        self.text.config(state="disabled")
-        if 0.0 <= xview <= 1.0:
-            self.text.xview_moveto(xview)
-        if 0.0 <= yview <= 1.0:
-            self.text.yview_moveto(yview)
-        self.parent.wm_title(parser.title)
-        self.parent.wm_iconname(parser.title)
-        self.defcursor, self.handcursor = old_c1, old_c2
-        self.text.config(cursor=self.defcursor)
-        ##self.frame.config(cursor=self.defcursor)
-
-    def addHistory(self, url, xview=0, yview=0):
-        if url not in self.visited_urls:
-            self.visited_urls.append(url)
-        if self.history.index > 0:
-            u, xv, yv = self.history.list[self.history.index-1]
-            if cmp(u, url) == 0:
-                self.updateHistoryXYView()
-                return
-        del self.history.list[self.history.index : ]
-        self.history.list.append((url, xview, yview))
-        self.history.index = self.history.index + 1
-
-    def updateHistoryXYView(self):
-        if self.history.index > 0:
-            url, xview, yview = self.history.list[self.history.index-1]
-            xview = self.text.xview()[0]
-            yview = self.text.yview()[0]
-            self.history.list[self.history.index-1] = (url, xview, yview)
-
-    def goBack(self, *event):
-        if self.history.index > 1:
-            self.updateHistoryXYView()
-            self.history.index = self.history.index - 1
-            url, xview, yview = self.history.list[self.history.index-1]
-            self.display(url, add=0, relpath=0, xview=xview, yview=yview)
-
-    def goForward(self, *event):
-        if self.history.index < len(self.history.list):
-            self.updateHistoryXYView()
-            url, xview, yview = self.history.list[self.history.index]
-            self.history.index = self.history.index + 1
-            self.display(url, add=0, relpath=0, xview=xview, yview=yview)
-
-    def goHome(self, *event):
-        if self.home and cmp(self.home, self.url) != 0:
-            self.updateHistoryXYView()
-            self.display(self.home, relpath=0)
-
-    def errorDialog(self, msg):
-        d = MfxMessageDialog(self.parent, title=TITLE+" HTML Problem",
-                             text=msg,
-                             ##bitmap="warning", # FIXME: this interp don't have images
-                             strings=(_("&OK"),), default=0)
-
-    def getImage(self, fn):
-        if fn in self.images:
-            return self.images[fn]
-        try:
-            img = Tkinter.PhotoImage(master=self.parent, file=fn)
-        except:
-            img = None
-        self.images[fn] = img
-        return img
-
-    def showImage(self, src, alt, ismap, align, width, height):
-        url = self.basejoin(src)
-        img = self.getImage(url)
-        if img:
-            self.text.image_create(index="insert", image=img, padx=0, pady=0)
-
-
 
 # ************************************************************************
 # *

pysollib/ui/tktile/tkhtml.py

@@ -21,7 +21,14 @@
 ##
 ##---------------------------------------------------------------------------##
 
+import os
 import htmllib, formatter
+import Tkinter
+
+from pysollib.ui.tktile.tkutil import bind, unbind_destroy
+from pysollib.mygettext import _
+from pysollib.settings import TITLE
+from pysollib.mfxutil import openURL
 
 REMOTE_PROTOCOLS = ("ftp:", "gopher:", "http:", "mailto:", "news:", "telnet:")
 
@@ -189,3 +196,226 @@ class tkHTMLParser(htmllib.HTMLParser):
     def handle_image(self, src, alt, ismap, align, width, height):
         self.formatter.writer.viewer.showImage(src, alt, ismap, align, width, height)
 
+class Base_HTMLViewer:
+    def initBindings(self):
+        w = self.parent
+        bind(w, "WM_DELETE_WINDOW", self.destroy)
+        bind(w, "<Escape>", self.destroy)
+        bind(w, "<KeyPress-Prior>", self.page_up)
+        bind(w, "<KeyPress-Next>", self.page_down)
+        bind(w, "<KeyPress-Up>", self.unit_up)
+        bind(w, "<KeyPress-Down>", self.unit_down)
+        bind(w, "<KeyPress-Begin>", self.scroll_top)
+        bind(w, "<KeyPress-Home>", self.scroll_top)
+        bind(w, "<KeyPress-End>", self.scroll_bottom)
+        bind(w, "<KeyPress-BackSpace>", self.goBack)
+
+    def destroy(self, *event):
+        unbind_destroy(self.parent)
+        try:
+            self.parent.wm_withdraw()
+        except: pass
+        try:
+            self.parent.destroy()
+        except: pass
+        self.parent = None
+
+    def _yview(self, *args):
+        self.text.yview(*args)
+        return 'break'
+
+    def page_up(self, *event):
+        return self._yview('scroll', -1, 'page')
+    def page_down(self, *event):
+        return self._yview('scroll', 1, 'page')
+    def unit_up(self, *event):
+        return self._yview('scroll', -1, 'unit')
+    def unit_down(self, *event):
+        return self._yview('scroll', 1, 'unit')
+    def scroll_top(self, *event):
+        return self._yview('moveto', 0)
+    def scroll_bottom(self, *event):
+        return self._yview('moveto', 1)
+
+    # locate a file relative to the current self.url
+    def basejoin(self, url, baseurl=None, relpath=1):
+        if baseurl is None:
+            baseurl = self.url
+        if 0:
+            import urllib
+            url = urllib.pathname2url(url)
+            if relpath and self.url:
+                url = urllib.basejoin(baseurl, url)
+        else:
+            url = os.path.normpath(url)
+            if relpath and baseurl and not os.path.isabs(url):
+                h1, t1 = os.path.split(url)
+                h2, t2 = os.path.split(baseurl)
+                if cmp(h1, h2) != 0:
+                    url = os.path.join(h2, h1, t1)
+                url = os.path.normpath(url)
+        return url
+
+    def normurl(self, url, with_protocol=True):
+        for p in REMOTE_PROTOCOLS:
+            if url.startswith(p):
+                break
+        else:
+            url = self.basejoin(url)
+            if with_protocol:
+                if os.name == 'nt':
+                    url = url.replace('\\', '/')
+                url = 'file://'+url
+        return url
+
+    def openfile(self, url):
+        if url[-1:] == "/" or os.path.isdir(url):
+            url = os.path.join(url, "index.html")
+        url = os.path.normpath(url)
+        return open(url, "rb"), url
+
+    def display(self, url, add=1, relpath=1, xview=0, yview=0):
+        # for some reason we have to stop the PySol demo
+        # (is this a multithread problem with Tkinter ?)
+        if self.app and self.app.game:
+            self.app.game.stopDemo()
+            ##self.app.game._cancelDrag()
+            ##pass
+
+        # ftp: and http: would work if we use urllib, but this widget is
+        # far too limited to display anything but our documentation...
+        for p in REMOTE_PROTOCOLS:
+            if url.startswith(p):
+                if not openURL(url):
+                    self.errorDialog(TITLE + _('''HTML limitation:
+The %s protocol is not supported yet.
+
+Please use your standard web browser
+to open the following URL:
+%s
+''') % (p, url))
+                return
+
+        # locate the file relative to the current url
+        url = self.basejoin(url, relpath=relpath)
+
+        # read the file
+        try:
+            file = None
+            if 0:
+                import urllib
+                file = urllib.urlopen(url)
+            else:
+                file, url = self.openfile(url)
+            data = file.read()
+            file.close()
+            file = None
+        except Exception, ex:
+            if file: file.close()
+            self.errorDialog(_("Unable to service request:\n") + url + "\n\n" + str(ex))
+            return
+        except:
+            if file: file.close()
+            self.errorDialog(_("Unable to service request:\n") + url)
+            return
+
+        self.url = url
+        if self.home is None:
+            self.home = self.url
+        if add:
+            self.addHistory(self.url, xview=xview, yview=yview)
+
+        ##print self.history.index, self.history.list
+        if self.history.index > 1:
+            self.backButton.config(state="normal")
+        else:
+            self.backButton.config(state="disabled")
+        if self.history.index < len(self.history.list):
+            self.forwardButton.config(state="normal")
+        else:
+            self.forwardButton.config(state="disabled")
+
+        old_c1, old_c2 = self.defcursor, self.handcursor
+        self.defcursor = self.handcursor = "watch"
+        self.text.config(cursor=self.defcursor)
+        self.text.update_idletasks()
+        ##self.frame.config(cursor=self.defcursor)
+        ##self.frame.update_idletasks()
+        self.text.config(state="normal")
+        self.text.delete("1.0", "end")
+        ##self.images = {}
+        writer = tkHTMLWriter(self.text, self, self.app)
+        fmt = formatter.AbstractFormatter(writer)
+        parser = tkHTMLParser(fmt)
+        parser.feed(data)
+        parser.close()
+        self.text.config(state="disabled")
+        if 0.0 <= xview <= 1.0:
+            self.text.xview_moveto(xview)
+        if 0.0 <= yview <= 1.0:
+            self.text.yview_moveto(yview)
+        self.parent.wm_title(parser.title)
+        self.parent.wm_iconname(parser.title)
+        self.defcursor, self.handcursor = old_c1, old_c2
+        self.text.config(cursor=self.defcursor)
+        ##self.frame.config(cursor=self.defcursor)
+
+    def addHistory(self, url, xview=0, yview=0):
+        if url not in self.visited_urls:
+            self.visited_urls.append(url)
+        if self.history.index > 0:
+            u, xv, yv = self.history.list[self.history.index-1]
+            if cmp(u, url) == 0:
+                self.updateHistoryXYView()
+                return
+        del self.history.list[self.history.index : ]
+        self.history.list.append((url, xview, yview))
+        self.history.index = self.history.index + 1
+
+    def updateHistoryXYView(self):
+        if self.history.index > 0:
+            url, xview, yview = self.history.list[self.history.index-1]
+            xview = self.text.xview()[0]
+            yview = self.text.yview()[0]
+            self.history.list[self.history.index-1] = (url, xview, yview)
+
+    def goBack(self, *event):
+        if self.history.index > 1:
+            self.updateHistoryXYView()
+            self.history.index = self.history.index - 1
+            url, xview, yview = self.history.list[self.history.index-1]
+            self.display(url, add=0, relpath=0, xview=xview, yview=yview)
+
+    def goForward(self, *event):
+        if self.history.index < len(self.history.list):
+            self.updateHistoryXYView()
+            url, xview, yview = self.history.list[self.history.index]
+            self.history.index = self.history.index + 1
+            self.display(url, add=0, relpath=0, xview=xview, yview=yview)
+
+    def goHome(self, *event):
+        if self.home and cmp(self.home, self.url) != 0:
+            self.updateHistoryXYView()
+            self.display(self.home, relpath=0)
+
+    def errorDialog(self, msg):
+        d = self._calc_MfxMessageDialog()(self.parent, title=TITLE+" HTML Problem",
+                             text=msg,
+                             ##bitmap="warning", # FIXME: this interp don't have images
+                             strings=(_("&OK"),), default=0)
+
+    def getImage(self, fn):
+        if fn in self.images:
+            return self.images[fn]
+        try:
+            img = Tkinter.PhotoImage(master=self.parent, file=fn)
+        except:
+            img = None
+        self.images[fn] = img
+        return img
+
+    def showImage(self, src, alt, ismap, align, width, height):
+        url = self.basejoin(src)
+        img = self.getImage(url)
+        if img:
+            self.text.image_create(index="insert", image=img, padx=0, pady=0)