Add Nik Tautenhahns igrid extension. (igrid is a wxPython-based

display object for ipipe.)

IPython/Extensions/igrid.py

@@ -0,0 +1,764
+# -*- 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])
+            (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.fontsize = fontsize
+
+    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)
+
+    def GetColLabelValue(self, col):
+        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):
+        # 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.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)
+
+    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_rows = len(self.items)
+        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)
+        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.GetView().AutoSizeColumns(False)
+            self.sizing = False
+        if row >= have_rows:
+            return ""
+        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]
+        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]
+        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])
+            (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]
+            returnobj = []
+            for i in xrange(self.GetNumberRows()):
+                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]
+            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]
+            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]
+            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()
+        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]
+            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]
+            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 = ""
+
+    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
+        """
+        filename = os.path.join(os.path.dirname(__file__), "help.html")
+        frm = IGridHTMLHelp(None, title="Help", filename=filename, size=wx.Size(600,400))
+        frm.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__), "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: