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[wxWidgets.git] / wxPython / demo / wxGrid_MegaExample.py

from wxPython.wx import *
from wxPython.grid import *
import images

class MegaTable(wxPyGridTableBase):
    """
    A custom wxGrid 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*
        wxPyGridTableBase.__init__(self)
        self.data = data
        self.colnames = colnames
        self.plugins = plugins or {}
        # XXX
        # we need to store the row length and collength 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 GetRowLabelValues(self, row):
        return 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):
        """
        (wxGrid) -> 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(), wxGRIDTABLE_NOTIFY_ROWS_DELETED, wxGRIDTABLE_NOTIFY_ROWS_APPENDED),
            (self._cols, self.GetNumberCols(), wxGRIDTABLE_NOTIFY_COLS_DELETED, wxGRIDTABLE_NOTIFY_COLS_APPENDED),
        ]:
            if new < current:
                msg = wxGridTableMessage(self,delmsg,new,current-new)
                grid.ProcessTableMessage(msg)
            elif new > current:
                msg = wxGridTableMessage(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 = wxGridTableMessage(self, wxGRIDTABLE_REQUEST_VIEW_GET_VALUES)
        grid.ProcessTableMessage(msg)

    def _updateColAttrs(self, grid):
        """
        wxGrid -> 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 = wxGridCellAttr()
            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):
        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 wxGrid renderers

class MegaImageRenderer(wxPyGridCellRenderer):
    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]
        """
        wxPyGridCellRenderer.__init__(self)
        self.table = table
        self._choices = [images.getSmilesBitmap,
                         images.getMondrianBitmap,
                         images.get_10s_Bitmap,
                         images.get_01c_Bitmap]


        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 = wxMemoryDC()
        image.SelectObject(bmp)

        # clear the background
        dc.SetBackgroundMode(wxSOLID)
        if isSelected:
            dc.SetBrush(wxBrush(wxBLUE, wxSOLID))
            dc.SetPen(wxPen(wxBLUE, 1, wxSOLID))
        else:
            dc.SetBrush(wxBrush(wxWHITE, wxSOLID))
            dc.SetPen(wxPen(wxWHITE, 1, wxSOLID))
        dc.DrawRectangle(rect.x, rect.y, rect.width, rect.height)

        # 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, wxCOPY, True)


class MegaFontRenderer(wxPyGridCellRenderer):
    def __init__(self, table, color="blue", font="ARIAL", fontsize=8):
        """Render data in the specified color and font and fontsize"""
        wxPyGridCellRenderer.__init__(self)
        self.table = table
        self.color = color
        self.font = wxFont(fontsize, wxDEFAULT, wxNORMAL, wxNORMAL,
                           0, font)
        self.selectedBrush = wxBrush("blue",
                                     wxSOLID)
        self.normalBrush = wxBrush(wxWHITE, wxSOLID)
        self.colSize = None
        self.rowSize = 50

    def Draw(self, grid, attr, dc, rect, row, col, isSelected):
        # Here we draw text in a grid cell using various fonts
        # and colors.  We have to set the clipping region on
        # the grid's DC, otherwise the text will spill over
        # to the next cell
        dc.SetClippingRect(rect)

        # clear the background
        dc.SetBackgroundMode(wxSOLID)
        if isSelected:
            dc.SetBrush(wxBrush(wxBLUE, wxSOLID))
            dc.SetPen(wxPen(wxBLUE, 1, wxSOLID))
        else:
            dc.SetBrush(wxBrush(wxWHITE, wxSOLID))
            dc.SetPen(wxPen(wxWHITE, 1, wxSOLID))
        dc.DrawRectangle(rect.x, rect.y, rect.width, rect.height)

        text = self.table.GetValue(row, col)
        dc.SetBackgroundMode(wxSOLID)

        # change the text background based on whether the grid is selected
        # or not
        if isSelected:
            dc.SetBrush(self.selectedBrush)
            dc.SetTextBackground("blue")
        else:
            dc.SetBrush(self.normalBrush)
            dc.SetTextBackground("white")

        dc.SetTextForeground(self.color)
        dc.SetFont(self.font)
        dc.DrawText(text, rect.x+1, rect.y+1)

        # Okay, now for the advanced class :)
        # Let's add three dots "..."
        # to indicate that that there is more text to be read
        # when the text is larger than the grid cell

        width, height = dc.GetTextExtent(text)
        if width > rect.width-2:
            width, height = dc.GetTextExtent("...")
            x = rect.x+1 + rect.width-2 - width
            dc.DrawRectangle(x, rect.y+1, width+1, height)
            dc.DrawText("...", x, rect.y+1)

        dc.DestroyClippingRegion()


# --------------------------------------------------------------------
# Sample Grid using a specialized table and renderers that can
# be plugged in based on column names

class MegaGrid(wxGrid):
    def __init__(self, parent, data, colnames, plugins=None):
        """parent, data, colnames, plugins=None
        Initialize a grid using the data defined in data and colnames
        (see MegaTable for a description of the data format)
        plugins is a dictionary of columnName -> column renderers.
        """

        # The base class must be initialized *first*
        wxGrid.__init__(self, parent, -1)
        self._table = MegaTable(data, colnames, plugins)
        self.SetTable(self._table)
        self._plugins = plugins

        EVT_GRID_LABEL_RIGHT_CLICK(self, self.OnLabelRightClicked)

    def Reset(self):
        """reset the view based on the data in the table.  Call
        this when rows are added or destroyed"""
        self._table.ResetView(self)

    def OnLabelRightClicked(self, evt):
        # Did we click on a row or a column?
        row, col = evt.GetRow(), evt.GetCol()
        if row == -1: self.colPopup(col, evt)
        elif col == -1: self.rowPopup(row, evt)

    def rowPopup(self, row, evt):
        """(row, evt) -> display a popup menu when a row label is right clicked"""
        appendID = wxNewId()
        deleteID = wxNewId()
        x = self.GetRowSize(row)/2
        if not self.GetSelectedRows():
            self.SelectRow(row)
        menu = wxMenu()
        xo, yo = evt.GetPosition()
        menu.Append(appendID, "Append Row")
        menu.Append(deleteID, "Delete Row(s)")

        def append(event, self=self, row=row):
            self._table.AppendRow(row)
            self.Reset()

        def delete(event, self=self, row=row):
            rows = self.GetSelectedRows()
            self._table.DeleteRows(rows)
            self.Reset()

        EVT_MENU(self, appendID, append)
        EVT_MENU(self, deleteID, delete)
        self.PopupMenu(menu, wxPoint(x, yo))
        menu.Destroy()

    def colPopup(self, col, evt):
        """(col, evt) -> display a popup menu when a column label is
        right clicked"""
        x = self.GetColSize(col)/2
        menu = wxMenu()
        id1 = wxNewId()
        sortID = wxNewId()

        xo, yo = evt.GetPosition()
        self.SelectCol(col)
        cols = self.GetSelectedCols()
        self.Refresh()
        menu.Append(id1, "Delete Col(s)")
        menu.Append(sortID, "Sort Column")

        def delete(event, self=self, col=col):
            cols = self.GetSelectedCols()
            self._table.DeleteCols(cols)
            self.Reset()

        def sort(event, self=self, col=col):
            self._table.SortColumn(col)
            self.Reset()

        EVT_MENU(self, id1, delete)
        if len(cols) == 1:
            EVT_MENU(self, sortID, sort)
        self.PopupMenu(menu, wxPoint(xo, 0))
        menu.Destroy()

# -----------------------------------------------------------------
# Test data
# data is in the form
# [rowname, dictionary]
# where dictionary.get(colname, None) -> returns the value for the cell
#
# the colname must also be supplied
import random
colnames = ["Row", "This", "Is", "A", "Test"]

data = []
for row in range(1000):
    d = {}
    for name in ["This", "Test", "Is"]:
        d[name] = random.random()
    d["Row"] = len(data)
    # XXX
    # the "A" column can only be between one and 4
    d["A"] = random.choice(range(4))
    data.append((str(row), d))

class MegaFontRendererFactory:
    def __init__(self, color, font, fontsize):
        """
        (color, font, fontsize) -> set of a factory to generate
        renderers when called.
        func = MegaFontRenderFactory(color, font, fontsize)
        renderer = func(table)
        """
        self.color = color
        self.font = font
        self.fontsize = fontsize

    def __call__(self, table):
        return MegaFontRenderer(table, self.color, self.font, self.fontsize)


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

class TestFrame(wxFrame):
    def __init__(self, parent, plugins={"This":MegaFontRendererFactory("red", "ARIAL", 8),
                                        "A":MegaImageRenderer,
                                        "Test":MegaFontRendererFactory("orange", "TIMES", 24),}):
        wxFrame.__init__(self, parent, -1,
                         "Test Frame", size=(640,480))

        grid = MegaGrid(self, data, colnames, plugins)
        grid.Reset()


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

def runTest(frame, nb, log):
    win = TestFrame(frame)
    frame.otherWin = win
    win.Show(True)



overview = """Mega Grid Example

This example attempts to show many examples and tricks of
using a virtual grid object.  Hopefully the source isn't too jumbled.

Features:
   1) Uses a virtual grid
   2) Columns and rows have popup menus (right click on labels)
   3) Columns and rows can be deleted (i.e. table can be
      resized)
   4) Dynamic renderers.  Renderers are plugins based on
      column header name.  Shows a simple Font Renderer and
      an Image Renderer.

Look for XXX in the code to indicate some workarounds for non-obvious
behavior and various hacks.

"""




if __name__ == '__main__':
    import sys,os
    import run
    run.main(['', os.path.basename(sys.argv[0])])