Make a few igrid attributes private.

As igrid displays all attributes it ever encounters, fetch() (which has
been renamed to _fetch()) doesn't have to recalculate the display attributes
every time a new item is fetched. This should speed up scrolling.

IPython/Extensions/igrid.py

@@ -1,769 +1,752 b''
 # -*- coding: iso-8859-1 -*-
 
 import ipipe, os, webbrowser, urllib
 import wx
 import wx.grid, wx.html
 
 try:
     sorted
 except NameError:
     from ipipe import sorted
 
 
 __all__ = ["igrid"]
 
 
 class IGridRenderer(wx.grid.PyGridCellRenderer):
     """
     This is a custom renderer for our IGridGrid
     """
     def __init__(self, table):
         self.maxchars = 200
         self.table = table
         self.colormap = (
             (  0,   0,   0),
             (174,   0,   0),
             (  0, 174,   0),
             (174, 174,   0),
             (  0,   0, 174),
             (174,   0, 174),
             (  0, 174, 174),
             ( 64,  64,  64)
         )
 
         wx.grid.PyGridCellRenderer.__init__(self)
 
     def _getvalue(self, row, col):
         try:
-            value = self.table.displayattrs[col].value(self.table.items[row])
+            value = self.table._displayattrs[col].value(self.table.items[row])
             (align, width, text) = ipipe.xformat(value, "cell", self.maxchars)
         except Exception, exc:
             (align, width, text) = ipipe.xformat(exc, "cell", self.maxchars)
         return (align, text)
 
     def GetBestSize(self, grid, attr, dc, row, col):
         text = grid.GetCellValue(row, col)
         (align, text) = self._getvalue(row, col)
         dc.SetFont(attr.GetFont())
         (w, h) = dc.GetTextExtent(str(text))
         return wx.Size(min(w+2, 600), h+2) # add border
 
     def Draw(self, grid, attr, dc, rect, row, col, isSelected):
         """
         Takes care of drawing everything in the cell; aligns the text
         """
         text = grid.GetCellValue(row, col)
         (align, text) = self._getvalue(row, col)
         if isSelected:
             bg = grid.GetSelectionBackground()
         else:
             bg = ["white", (240, 240, 240)][row%2]
         dc.SetTextBackground(bg)
         dc.SetBrush(wx.Brush(bg, wx.SOLID))
         dc.SetPen(wx.TRANSPARENT_PEN)
         dc.SetFont(attr.GetFont())
         dc.DrawRectangleRect(rect)
         dc.SetClippingRect(rect)
         # Format the text
         if align == -1: # left alignment
             (width, height) = dc.GetTextExtent(str(text))
             x = rect[0]+1
             y = rect[1]+0.5*(rect[3]-height)
 
             for (style, part) in text:
                 if isSelected:
                     fg = grid.GetSelectionForeground()
                 else:
                     fg = self.colormap[style.fg]
                 dc.SetTextForeground(fg)
                 (w, h) = dc.GetTextExtent(part)
                 dc.DrawText(part, x, y)
                 x += w
         elif align == 0: # center alignment
             (width, height) = dc.GetTextExtent(str(text))
             x = rect[0]+0.5*(rect[2]-width)
             y = rect[1]+0.5*(rect[3]-height)
             for (style, part) in text:
                 if isSelected:
                     fg = grid.GetSelectionForeground()
                 else:
                     fg = self.colormap[style.fg]
                 dc.SetTextForeground(fg)
                 (w, h) = dc.GetTextExtent(part)
                 dc.DrawText(part, x, y)
                 x += w
         else:  # right alignment
             (width, height) = dc.GetTextExtent(str(text))
             x = rect[0]+rect[2]-1
             y = rect[1]+0.5*(rect[3]-height)
             for (style, part) in reversed(text):
                 (w, h) = dc.GetTextExtent(part)
                 x -= w
                 if isSelected:
                     fg = grid.GetSelectionForeground()
                 else:
                     fg = self.colormap[style.fg]
                 dc.SetTextForeground(fg)
                 dc.DrawText(part, x, y)
         dc.DestroyClippingRegion()
 
     def Clone(self):
         return IGridRenderer(self.table)
 
 
 class IGridTable(wx.grid.PyGridTableBase):
     # The data table for the ``IGridGrid``. Some dirty tricks were used here:
     # ``GetValue()`` does not get any values (or at least it does not return
     # anything, accessing the values is done by the renderer)
     # but rather tries to fetch the objects which were requested into the table.
     # General behaviour is: Fetch the first X objects. If the user scrolls down
     # to the last object another bunch of X objects is fetched (if possible)
     def __init__(self, input, fontsize, *attrs):
         wx.grid.PyGridTableBase.__init__(self)
         self.input = input
         self.iterator = ipipe.xiter(input)
         self.items = []
-        self.hiddenattrs = []
-        self.attrs = attrs
-        self.displayattrs = []
-        self.fetch(1)
-        self.sizing = False
+        self.attrs = [ipipe.upgradexattr(attr) for attr in attrs]
+        self._displayattrs = self.attrs[:]
+        self._displayattrset = set(self.attrs)
+        self._sizing = False
         self.fontsize = fontsize
+        self._fetch(1)
 
     def GetAttr(self, *args):
         attr = wx.grid.GridCellAttr()
         attr.SetFont(wx.Font(self.fontsize, wx.TELETYPE, wx.NORMAL, wx.NORMAL))
         return attr
 
     def GetNumberRows(self):
         return len(self.items)
 
     def GetNumberCols(self):
-        return len(self.displayattrs)
+        return len(self._displayattrs)
 
     def GetColLabelValue(self, col):
-        if col < len(self.displayattrs):
-            return self.displayattrs[col].name()
+        if col < len(self._displayattrs):
+            return self._displayattrs[col].name()
         else:
             return ""
 
     def GetRowLabelValue(self, row):
         return str(row)
 
     def IsEmptyCell(self, row, col):
         return False
 
-    def fetch(self, count):
+    def _append(self, item):
+        self.items.append(item)
+        # Nothing to do if the set of attributes has been fixed by the user
+        if not self.attrs:
+            for attr in ipipe.xattrs(item):
+                attr = ipipe.upgradexattr(attr)
+                if attr not in self._displayattrset:
+                    self._displayattrs.append(attr)
+                    self._displayattrset.add(attr)
+
+    def _fetch(self, count):
         # Try to fill ``self.items`` with at least ``count`` objects.
         have = len(self.items)
-        work = False
         while self.iterator is not None and have < count:
             try:
                 item = self.iterator.next()
             except StopIteration:
                 self.iterator = None
                 break
             except (KeyboardInterrupt, SystemExit):
                 raise
             except Exception, exc:
                 have += 1
-                self.items.append(exc)
-                work = True
+                self._append(item)
                 self.iterator = None
                 break
             else:
                 have += 1
-                self.items.append(item)
-                work = True
-        if work:
-            self.calcdisplayattrs()
-
-    def calcdisplayattrs(self):
-        # Calculate which attributes are available from the objects that are
-        # currently visible on screen (and store it in ``self.displayattrs``)
-        attrs = set()
-        self.displayattrs = []
-        if self.attrs:
-            # If the browser object specifies a fixed list of attributes,
-            # simply use it (removing hidden attributes).
-            for attr in self.attrs:
-                attr = ipipe.upgradexattr(attr)
-                if attr not in attrs and attr not in self.hiddenattrs:
-                    self.displayattrs.append(attr)
-                    attrs.add(attr)
-        else:
-            endy = len(self.items)
-            for i in xrange(endy):
-                for attr in ipipe.xattrs(self.items[i]):
-                    attr = ipipe.upgradexattr(attr)
-                    if attr not in attrs and attr not in self.hiddenattrs:
-                        self.displayattrs.append(attr)
-                        attrs.add(attr)
+                self._append(item)
 
     def GetValue(self, row, col):
         # some kind of dummy-function: does not return anything but "";
         # (The value isn't use anyway)
         # its main task is to trigger the fetch of new objects
-        had_cols = self.displayattrs[:]
+        had_cols = self._displayattrs[:]
         had_rows = len(self.items)
-        if row == had_rows - 1 and self.iterator is not None and not self.sizing:
-            self.fetch(row + 20)
+        if row == had_rows - 1 and self.iterator is not None and not self._sizing:
+            self._fetch(row + 20)
         have_rows = len(self.items)
-        have_cols = len(self.displayattrs)
+        have_cols = len(self._displayattrs)
         if have_rows > had_rows:
             msg = wx.grid.GridTableMessage(self, wx.grid.GRIDTABLE_NOTIFY_ROWS_APPENDED, have_rows - had_rows)
             self.GetView().ProcessTableMessage(msg)
-            self.sizing = True
+            self._sizing = True
             self.GetView().AutoSizeColumns(False)
-            self.sizing = False
+            self._sizing = False
         if row >= have_rows:
             return ""
-        if self.displayattrs != had_cols:
+        if self._displayattrs != had_cols:
             msg = wx.grid.GridTableMessage(self, wx.grid.GRIDTABLE_NOTIFY_COLS_APPENDED, have_cols - len(had_cols))
             self.GetView().ProcessTableMessage(msg)
         return ""
 
     def SetValue(self, row, col, value):
         pass
 
 
 class IGridGrid(wx.grid.Grid):
     # The actual grid
     # all methods for selecting/sorting/picking/... data are implemented here
     def __init__(self, panel, input, *attrs):
         wx.grid.Grid.__init__(self, panel)
         fontsize = 9
         self.input = input
         self.table = IGridTable(self.input, fontsize, *attrs)
         self.SetTable(self.table, True)
         self.SetSelectionMode(wx.grid.Grid.wxGridSelectRows)
         self.SetDefaultRenderer(IGridRenderer(self.table))
         self.EnableEditing(False)
         self.Bind(wx.EVT_KEY_DOWN, self.key_pressed)
         self.Bind(wx.grid.EVT_GRID_CELL_LEFT_DCLICK, self.cell_doubleclicked)
         self.Bind(wx.grid.EVT_GRID_LABEL_LEFT_DCLICK, self.label_doubleclicked)
         self.Bind(wx.grid.EVT_GRID_LABEL_LEFT_CLICK, self.on_label_leftclick)
         self.Bind(wx.grid.EVT_GRID_RANGE_SELECT, self._on_selected_range)
         self.Bind(wx.grid.EVT_GRID_SELECT_CELL, self._on_selected_cell)
         self.current_selection = set()
         self.maxchars = 200
 
     def on_label_leftclick(self, event):
         event.Skip()
 
     def error_output(self, text):
         wx.Bell()
         frame = self.GetParent().GetParent().GetParent()
         frame.SetStatusText(text)
 
     def _on_selected_range(self, event):
         # Internal update to the selection tracking lists
         if event.Selecting():
             # adding to the list...
             self.current_selection.update(xrange(event.GetTopRow(), event.GetBottomRow()+1))
         else:
             # removal from list
             for index in xrange( event.GetTopRow(), event.GetBottomRow()+1):
                 self.current_selection.discard(index)
         event.Skip()
 
     def _on_selected_cell(self, event):
         # Internal update to the selection tracking list
         self.current_selection = set([event.GetRow()])
         event.Skip()
 
     def sort(self, key, reverse=False):
         """
         Sort the current list of items using the key function ``key``. If
         ``reverse`` is true the sort order is reversed.
         """
         row = self.GetGridCursorRow()
         col = self.GetGridCursorCol()
         curitem = self.table.items[row] # Remember where the cursor is now
         # Sort items
         def realkey(item):
             return key(item)
         try:
             self.table.items = ipipe.deque(sorted(self.table.items, key=realkey, reverse=reverse))
         except TypeError, exc:
             self.error_output("Exception encountered: %s" % exc)
             return
         # Find out where the object under the cursor went
         for (i, item) in enumerate(self.table.items):
             if item is curitem:
                 self.SetGridCursor(i,col)
                 self.MakeCellVisible(i,col)
                 self.Refresh()
 
     def sortattrasc(self):
         """
         Sort in ascending order; sorting criteria is the current attribute
         """
         col = self.GetGridCursorCol()
-        attr = self.table.displayattrs[col]
+        attr = self.table._displayattrs[col]
         frame = self.GetParent().GetParent().GetParent()
         if attr is ipipe.noitem:
             self.error_output("no column under cursor")
             return
         frame.SetStatusText("sort by %s (ascending)" % attr.name())
         def key(item):
             try:
                 return attr.value(item)
             except (KeyboardInterrupt, SystemExit):
                 raise
             except Exception:
                 return None
         self.sort(key)
 
     def sortattrdesc(self):
         """
         Sort in descending order; sorting criteria is the current attribute
         """
         col = self.GetGridCursorCol()
-        attr = self.table.displayattrs[col]
+        attr = self.table._displayattrs[col]
         frame = self.GetParent().GetParent().GetParent()
         if attr is ipipe.noitem:
             self.error_output("no column under cursor")
             return
         frame.SetStatusText("sort by %s (descending)" % attr.name())
         def key(item):
             try:
                 return attr.value(item)
             except (KeyboardInterrupt, SystemExit):
                 raise
             except Exception:
                 return None
         self.sort(key, reverse=True)
 
     def label_doubleclicked(self, event):
         row = event.GetRow()
         col = event.GetCol()
         if col == -1:
             self.enter(row)
 
     def _getvalue(self, row, col):
         """
         Gets the text which is displayed at ``(row, col)``
         """
         try:
-            value = self.table.displayattrs[col].value(self.table.items[row])
+            value = self.table._displayattrs[col].value(self.table.items[row])
             (align, width, text) = ipipe.xformat(value, "cell", self.maxchars)
         except IndexError:
             raise IndexError
         except Exception, exc:
             (align, width, text) = ipipe.xformat(exc, "cell", self.maxchars)
         return text
 
     def search(self, searchtext, startrow=0, startcol=0, search_forward=True):
         """
         search for ``searchtext``, starting in ``(startrow, startcol)``;
         if ``search_forward`` is true the direction is "forward"
         """
         row = startrow
         searchtext = searchtext.lower()
         if search_forward:
             while True:
                 for col in xrange(startcol, self.table.GetNumberCols()):
                     try:
                         foo = self.table.GetValue(row, col)
                         text = self._getvalue(row, col)
                         if searchtext in text.string().lower():
                             self.SetGridCursor(row, col)
                             self.MakeCellVisible(row, col)
                             return
                     except IndexError:
                         return
                 startcol = 0
                 row += 1
         else:
             while True:
                 for col in xrange(startcol, -1, -1):
                     try:
                         foo = self.table.GetValue(row, col)
                         text = self._getvalue(row, col)
                         if searchtext in text.string().lower():
                             self.SetGridCursor(row, col)
                             self.MakeCellVisible(row, col)
                             return
                     except IndexError:
                         return
                 startcol = self.table.GetNumberCols()-1
                 row -= 1
 
     def key_pressed(self, event):
         """
         Maps pressed keys to functions
         """
         frame = self.GetParent().GetParent().GetParent()
         frame.SetStatusText("")
         sh = event.ShiftDown()
         ctrl = event.ControlDown()
 
         keycode = event.GetKeyCode()
         if keycode == ord("P"):
             row = self.GetGridCursorRow()
             if event.ShiftDown():
                 col = self.GetGridCursorCol()
                 self.pickattr(row, col)
             else:
                 self.pick(row)
         elif keycode == ord("M"):
             if ctrl:
                 col = self.GetGridCursorCol()
                 self.pickrowsattr(sorted(self.current_selection), col)
             else:
                 self.pickrows(sorted(self.current_selection))
         elif keycode in (wx.WXK_BACK, wx.WXK_DELETE, ord("X")) and not (ctrl or sh):
             self.delete_current_notebook()
         elif keycode == ord("E") and not (ctrl or sh):
             row = self.GetGridCursorRow()
             self.enter(row)
         elif keycode == ord("E") and sh and not ctrl:
             row = self.GetGridCursorRow()
             col = self.GetGridCursorCol()
             self.enterattr(row, col)
         elif keycode == ord("E") and ctrl:
             row = self.GetGridCursorRow()
             self.SetGridCursor(row, self.GetNumberCols()-1)
         elif keycode == wx.WXK_HOME or (keycode == ord("A") and ctrl):
             row = self.GetGridCursorRow()
             self.SetGridCursor(row, 0)
         elif keycode == ord("C") and sh:
             col = self.GetGridCursorCol()
-            attr = self.table.displayattrs[col]
+            attr = self.table._displayattrs[col]
             returnobj = []
             for i in xrange(self.GetNumberRows()):
-                returnobj.append(self.table.displayattrs[col].value(self.table.items[i]))
+                returnobj.append(self.table._displayattrs[col].value(self.table.items[i]))
             self.quit(returnobj)
         elif keycode in (wx.WXK_ESCAPE, ord("Q")) and not (ctrl or sh):
             self.quit()
         elif keycode == ord("<"):
             row = self.GetGridCursorRow()
             col = self.GetGridCursorCol()
             if not event.ShiftDown():
                 newcol = col - 1
                 if newcol >= 0:
                     self.SetGridCursor(row, col - 1)
             else:
                 newcol = col + 1
                 if newcol < self.GetNumberCols():
                     self.SetGridCursor(row, col + 1)
         elif keycode == ord("D"):
             col = self.GetGridCursorCol()
             row = self.GetGridCursorRow()
             if not sh:
                 self.detail(row, col)
             else:
                 self.detail_attr(row, col)
         elif keycode == ord("F") and ctrl:
             frame.enter_searchtext(event)
         elif keycode == wx.WXK_F3:
             if sh:
                 frame.find_previous(event)
             else:
                 frame.find_next(event)
         elif keycode == ord("V"):
             if sh:
                 self.sortattrdesc()
             else:
                 self.sortattrasc()
         else:
             event.Skip()
 
     def delete_current_notebook(self):
         """
         deletes the current notebook tab
         """
         panel = self.GetParent()
         nb = panel.GetParent()
         current = nb.GetSelection()
         count = nb.GetPageCount()
         if count > 1:
             for i in xrange(count-1, current-1, -1):
                 nb.DeletePage(i)
             nb.GetCurrentPage().grid.SetFocus()
         else:
             frame = nb.GetParent()
             frame.SetStatusText("This is the last level!")
 
     def _doenter(self, value, *attrs):
         """
         "enter" a special item resulting in a new notebook tab
         """
         panel = self.GetParent()
         nb = panel.GetParent()
         frame = nb.GetParent()
         current = nb.GetSelection()
         count = nb.GetPageCount()
         try: # if we want to enter something non-iterable, e.g. a function
             if current + 1 == count and value is not self.input: # we have an event in the last tab
                 frame._add_notebook(value, *attrs)
             elif value != self.input: # we have to delete all tabs newer than [panel] first
                 for i in xrange(count-1, current, -1): # some tabs don't close if we don't close in *reverse* order
                     nb.DeletePage(i)
                 frame._add_notebook(value)
         except TypeError, exc:
             if exc.__class__.__module__ == "exceptions":
                 msg = "%s: %s" % (exc.__class__.__name__, exc)
             else:
                 msg = "%s.%s: %s" % (exc.__class__.__module__, exc.__class__.__name__, exc)
             frame.SetStatusText(msg)
 
     def enterattr(self, row, col):
         try:
-            attr = self.table.displayattrs[col]
+            attr = self.table._displayattrs[col]
             value = attr.value(self.table.items[row])
         except Exception, exc:
             self.error_output(str(exc))
         else:
             self._doenter(value)
 
     def enter(self, row):
         try:
             value = self.table.items[row]
         except Exception, exc:
             self.error_output(str(exc))
         else:
             self._doenter(value)
 
     def detail(self, row, col):
         """
         shows a detail-view of the current cell
         """
         try:
-            attr = self.table.displayattrs[col]
+            attr = self.table._displayattrs[col]
             item = self.table.items[row]
         except Exception, exc:
             self.error_output(str(exc))
         else:
             attrs = [ipipe.AttributeDetail(item, attr) for attr in ipipe.xattrs(item, "detail")]
             self._doenter(attrs)
 
     def detail_attr(self, row, col):
         try:
-            attr = self.table.displayattrs[col]
+            attr = self.table._displayattrs[col]
             item = attr.value(self.table.items[row])
         except Exception, exc:
             self.error_output(str(exc))
         else:
             attrs = [ipipe.AttributeDetail(item, attr) for attr in ipipe.xattrs(item, "detail")]
             self._doenter(attrs)
 
     def quit(self, returnobj=None):
         """
         quit
         """
         frame = self.GetParent().GetParent().GetParent()
         if frame.helpdialog:
             frame.helpdialog.Destroy()
         frame.parent.returnobj = returnobj
         frame.Close()
         frame.Destroy()
 
     def cell_doubleclicked(self, event):
         self.enterattr(event.GetRow(), event.GetCol())
 
     def pick(self, row):
         """
         pick a single row and return to the IPython prompt
         """
         try:
             value = self.table.items[row]
         except Exception, exc:
             self.error_output(str(exc))
         else:
             self.quit(value)
 
     def pickrows(self, rows):
         """
         pick multiple rows and return to the IPython prompt
         """
         try:
             value = [self.table.items[row] for row in rows]
         except Exception, exc:
             self.error_output(str(exc))
         else:
             self.quit(value)
 
     def pickrowsattr(self, rows, col):
         """"
         pick one column from multiple rows
         """
         values = []
         try:
-            attr = self.table.displayattrs[col]
+            attr = self.table._displayattrs[col]
             for row in rows:
                 try:
                     values.append(attr.value(self.table.items[row]))
                 except (SystemExit, KeyboardInterrupt):
                     raise
                 except Exception:
                     raise #pass
         except Exception, exc:
             self.error_output(str(exc))
         else:
             self.quit(values)
 
     def pickattr(self, row, col):
         try:
-            attr = self.table.displayattrs[col]
+            attr = self.table._displayattrs[col]
             value = attr.value(self.table.items[row])
         except Exception, exc:
             self.error_output(str(exc))
         else:
             self.quit(value)
 
 
 class IGridPanel(wx.Panel):
     # Each IGridPanel contains an IGridGrid
     def __init__(self, parent, input, *attrs):
         wx.Panel.__init__(self, parent, -1)
         self.grid = IGridGrid(self, input, *attrs)
         sizer = wx.BoxSizer(wx.VERTICAL)
         sizer.Add(self.grid, proportion=1, flag=wx.EXPAND | wx.ALL, border=10)
         self.SetSizer(sizer)
         sizer.Fit(self)
         sizer.SetSizeHints(self)
 
 
 class IGridHTMLHelp(wx.Frame):
     def __init__(self, parent, title, filename, size):
         wx.Frame.__init__(self, parent, -1, title, size=size)
         html = wx.html.HtmlWindow(self)
         if "gtk2" in wx.PlatformInfo:
             html.SetStandardFonts()
         html.LoadFile(filename)
 
 
 class IGridFrame(wx.Frame):
     maxtitlelen = 30
 
     def __init__(self, parent, input):
         wx.Frame.__init__(self, None, title="IGrid", size=(640, 480))
         self.menubar = wx.MenuBar()
         self.menucounter = 100
         self.m_help = wx.Menu()
         self.m_search = wx.Menu()
         self.m_sort = wx.Menu()
         self.notebook = wx.Notebook(self, -1, style=0)
         self.statusbar = self.CreateStatusBar(1, wx.ST_SIZEGRIP)
         self.parent = parent
         self._add_notebook(input)
         self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
         self.makemenu(self.m_sort, "&Sort (asc)", "Sort ascending", self.sortasc)
         self.makemenu(self.m_sort, "Sort (&desc)", "Sort descending", self.sortdesc)
         self.makemenu(self.m_help, "&Help", "Help", self.display_help)
         self.makemenu(self.m_help, "&Show help in browser", "Show help in browser", self.display_help_in_browser)
         self.makemenu(self.m_search, "&Find text", "Find text", self.enter_searchtext)
         self.makemenu(self.m_search, "Find by &expression", "Find by expression", self.enter_searchexpression)
         self.makemenu(self.m_search, "Find &next", "Find next", self.find_next)
         self.makemenu(self.m_search, "Find &previous", "Find previous", self.find_previous)
         self.menubar.Append(self.m_search, "&Find")
         self.menubar.Append(self.m_sort, "&Sort")
         self.menubar.Append(self.m_help, "&Help")
         self.SetMenuBar(self.menubar)
         self.searchtext = ""
         self.helpdialog = None
 
     def sortasc(self, event):
         grid = self.notebook.GetPage(self.notebook.GetSelection()).grid
         grid.sortattrasc()
 
     def sortdesc(self, event):
         grid = self.notebook.GetPage(self.notebook.GetSelection()).grid
         grid.sortattrdesc()
 
     def find_previous(self, event):
         """
         find previous occurrences
         """
         if self.searchtext:
             grid = self.notebook.GetPage(self.notebook.GetSelection()).grid
             row = grid.GetGridCursorRow()
             col = grid.GetGridCursorCol()
             if col-1 >= 0:
                 grid.search(self.searchtext, row, col-1, False)
             else:
                 grid.search(self.searchtext, row-1, grid.table.GetNumberCols()-1, False)
         else:
             self.enter_searchtext(event)
 
     def find_next(self, event):
         """
         find the next occurrence
         """
         if self.searchtext:
             grid = self.notebook.GetPage(self.notebook.GetSelection()).grid
             row = grid.GetGridCursorRow()
             col = grid.GetGridCursorCol()
             if col+1 < grid.table.GetNumberCols():
                 grid.search(self.searchtext, row, col+1)
             else:
                 grid.search(self.searchtext, row+1, 0)
         else:
             self.enter_searchtext(event)
 
     def display_help(self, event):
         """
         Display a help dialog
         """
         if self.helpdialog:
             self.helpdialog.Destroy()
         filename = os.path.join(os.path.dirname(__file__), "igrid_help.html")
         self.helpdialog = IGridHTMLHelp(None, title="Help", filename=filename, size=wx.Size(600,400))
         self.helpdialog.Show()
 
     def display_help_in_browser(self, event):
         """
         Show the help-HTML in a browser (as a ``HtmlWindow`` does not understand
         CSS this looks better)
         """
         filename = urllib.pathname2url(os.path.abspath(os.path.join(os.path.dirname(__file__), "igrid_help.html")))
         if not filename.startswith("file"):
             filename = "file:" + filename
         webbrowser.open(filename, new=1, autoraise=True)
 
     def enter_searchexpression(self, event):
         pass
 
     def makemenu(self, menu, label, help, cmd):
         menu.Append(self.menucounter, label, help)
         self.Bind(wx.EVT_MENU, cmd, id=self.menucounter)
         self.menucounter += 1
 
     def _add_notebook(self, input, *attrs):
         # Adds another notebook which has the starting object ``input``
         panel = IGridPanel(self.notebook, input, *attrs)
         text = str(ipipe.xformat(input, "header", self.maxtitlelen)[2])
         if len(text) >= self.maxtitlelen:
             text = text[:self.maxtitlelen].rstrip(".") + "..."
         self.notebook.AddPage(panel, text, True)
         panel.grid.SetFocus()
         self.Layout()
 
     def OnCloseWindow(self, event):
         self.Destroy()
 
     def enter_searchtext(self, event):
         # Displays a dialog asking for the searchtext
         dlg = wx.TextEntryDialog(self, "Find:", "Find in list")
         if dlg.ShowModal() == wx.ID_OK:
             self.searchtext = dlg.GetValue()
             self.notebook.GetPage(self.notebook.GetSelection()).grid.search(self.searchtext, 0, 0)
         dlg.Destroy()
 
 
 class igrid(ipipe.Display):
     """
     This is a wx-based display object that can be used instead of ``ibrowse``
     (which is curses-based) or ``idump`` (which simply does a print).
     """
     def display(self):
         self.returnobj = None
         app = wx.App()
         self.frame = IGridFrame(self, self.input)
         self.frame.Show()
         app.SetTopWindow(self.frame)
         self.frame.Raise()
         app.MainLoop()
         return self.returnobj