grid_megaexample.py

用wxPython编写GUI程序的样例代码

import  wx
import  wx.grid as  Grid

import  images

#---------------------------------------------------------------------------

class MegaTable(Grid.PyGridTableBase):
    """
    A custom wx.Grid Table using user supplied data
    """
    def __init__(self, data, colnames, plugins):
        """data is a list of the form
        [(rowname, dictionary),
        dictionary.get(colname, None) returns the data for column
        colname
        """
        # The base class must be initialized *first*
        Grid.PyGridTableBase.__init__(self)
        self.data = data
        self.colnames = colnames
        self.plugins = plugins or {}
        # XXX
        # we need to store the row length and column length to
        # see if the table has changed size
        self._rows = self.GetNumberRows()
        self._cols = self.GetNumberCols()

    def GetNumberCols(self):
        return len(self.colnames)

    def GetNumberRows(self):
        return len(self.data)

    def GetColLabelValue(self, col):
        return self.colnames[col]

    def GetRowLabelValue(self, row):
        return "row %03d" % int(self.data[row][0])

    def GetValue(self, row, col):
        return str(self.data[row][1].get(self.GetColLabelValue(col), ""))

    def GetRawValue(self, row, col):
        return self.data[row][1].get(self.GetColLabelValue(col), "")

    def SetValue(self, row, col, value):
        self.data[row][1][self.GetColLabelValue(col)] = value

    def ResetView(self, grid):
        """
        (Grid) -> Reset the grid view.   Call this to
        update the grid if rows and columns have been added or deleted
        """
        grid.BeginBatch()

        for current, new, delmsg, addmsg in [
            (self._rows, self.GetNumberRows(), Grid.GRIDTABLE_NOTIFY_ROWS_DELETED, Grid.GRIDTABLE_NOTIFY_ROWS_APPENDED),
            (self._cols, self.GetNumberCols(), Grid.GRIDTABLE_NOTIFY_COLS_DELETED, Grid.GRIDTABLE_NOTIFY_COLS_APPENDED),
        ]:

            if new < current:
                msg = Grid.GridTableMessage(self,delmsg,new,current-new)
                grid.ProcessTableMessage(msg)
            elif new > current:
                msg = Grid.GridTableMessage(self,addmsg,new-current)
                grid.ProcessTableMessage(msg)
                self.UpdateValues(grid)

        grid.EndBatch()

        self._rows = self.GetNumberRows()
        self._cols = self.GetNumberCols()
        # update the column rendering plugins
        self._updateColAttrs(grid)

        # update the scrollbars and the displayed part of the grid
        grid.AdjustScrollbars()
        grid.ForceRefresh()


    def UpdateValues(self, grid):
        """Update all displayed values"""
        # This sends an event to the grid table to update all of the values
        msg = Grid.GridTableMessage(self, Grid.GRIDTABLE_REQUEST_VIEW_GET_VALUES)
        grid.ProcessTableMessage(msg)

    def _updateColAttrs(self, grid):
        """
        wx.Grid -> update the column attributes to add the
        appropriate renderer given the column name.  (renderers
        are stored in the self.plugins dictionary)

        Otherwise default to the default renderer.
        """
        col = 0

        for colname in self.colnames:
            attr = Grid.GridCellAttr()
            if colname in self.plugins:
                renderer = self.plugins[colname](self)

                if renderer.colSize:
                    grid.SetColSize(col, renderer.colSize)

                if renderer.rowSize:
                    grid.SetDefaultRowSize(renderer.rowSize)

                attr.SetReadOnly(True)
                attr.SetRenderer(renderer)

            grid.SetColAttr(col, attr)
            col += 1

    # ------------------------------------------------------
    # begin the added code to manipulate the table (non wx related)
    def AppendRow(self, row):
        #print 'append'
        entry = {}

        for name in self.colnames:
            entry[name] = "Appended_%i"%row

        # XXX Hack
        # entry["A"] can only be between 1..4
        entry["A"] = random.choice(range(4))
        self.data.insert(row, ["Append_%i"%row, entry])

    def DeleteCols(self, cols):
        """
        cols -> delete the columns from the dataset
        cols hold the column indices
        """
        # we'll cheat here and just remove the name from the
        # list of column names.  The data will remain but
        # it won't be shown
        deleteCount = 0
        cols = cols[:]
        cols.sort()

        for i in cols:
            self.colnames.pop(i-deleteCount)
            # we need to advance the delete count
            # to make sure we delete the right columns
            deleteCount += 1

        if not len(self.colnames):
            self.data = []

    def DeleteRows(self, rows):
        """
        rows -> delete the rows from the dataset
        rows hold the row indices
        """
        deleteCount = 0
        rows = rows[:]
        rows.sort()

        for i in rows:
            self.data.pop(i-deleteCount)
            # we need to advance the delete count
            # to make sure we delete the right rows
            deleteCount += 1

    def SortColumn(self, col):
        """
        col -> sort the data based on the column indexed by col
        """
        name = self.colnames[col]
        _data = []

        for row in self.data:
            rowname, entry = row
            _data.append((entry.get(name, None), row))

        _data.sort()
        self.data = []

        for sortvalue, row in _data:
            self.data.append(row)

    # end table manipulation code
    # ----------------------------------------------------------


# --------------------------------------------------------------------
# Sample wx.Grid renderers

class MegaImageRenderer(Grid.PyGridCellRenderer):
    def __init__(self, table):
        """
        Image Renderer Test.  This just places an image in a cell
        based on the row index.  There are N choices and the
        choice is made by  choice[row%N]
        """
        Grid.PyGridCellRenderer.__init__(self)
        self.table = table
        self._choices = [images.getSmilesBitmap,
                         images.getMondrianBitmap,
                         images.getWXPdemoBitmap,
                         ]

        self.colSize = None
        self.rowSize = None

    def Draw(self, grid, attr, dc, rect, row, col, isSelected):
        choice = self.table.GetRawValue(row, col)
        bmp = self._choices[ choice % len(self._choices)]()
        image = wx.MemoryDC()
        image.SelectObject(bmp)

        # clear the background
        dc.SetBackgroundMode(wx.SOLID)

        if isSelected:
            dc.SetBrush(wx.Brush(wx.BLUE, wx.SOLID))
            dc.SetPen(wx.Pen(wx.BLUE, 1, wx.SOLID))
        else:
            dc.SetBrush(wx.Brush(wx.WHITE, wx.SOLID))
            dc.SetPen(wx.Pen(wx.WHITE, 1, wx.SOLID))
        dc.DrawRectangleRect(rect)


        # copy the image but only to the size of the grid cell
        width, height = bmp.GetWidth(), bmp.GetHeight()

        if width > rect.width-2:
            width = rect.width-2

        if height > rect.height-2:
            height = rect.height-2

        dc.Blit(rect.x+1, rect.y+1, width, height,
                image,
                0, 0, wx.COPY, True)


class MegaFontRenderer(Grid.PyGridCellRenderer):
    def __init__(self, table, color="blue", font="ARIAL", fontsize=8):
        """Render data in the specified color and font and fontsize"""
        Grid.PyGridCellRenderer.__init__(self)
        self.table = table
        self.color = color
        self.font = wx.Font(fontsize, wx.DEFAULT, wx.NORMAL, wx.NORMAL, 0, font)
        self.selectedBrush = wx.Brush("blue", wx.SOLID)
        self.normalBrush = wx.Brush(wx.WHITE, wx.SOLID)
        self.colSize = None
        self.rowSize = 50