wxWidgets/utils/wxPython/lib/grids.py

#----------------------------------------------------------------------
# Name:        wxPython.lib.grids
# Purpose:     An example sizer derived from the C++ wxPySizer that
#              sizes items in a fixed or flexible grid.
#
# Author:      Robin Dunn
#
# Created:     21-Sept-1999
# RCS-ID:      $Id$
# Copyright:   (c) 1999 by Total Control Software
# Licence:     wxWindows license
#----------------------------------------------------------------------

"""
In this module you will find wxGridSizer and wxFlexGridSizer.
wxGridSizer arrainges its items in a grid in which all the widths and
heights are the same.  wxFlexgridSizer allows different widths and
heights, and you can also specify rows and/or columns that are
growable.  See the demo for a couple examples for how to use them.
"""


from wxPython.wx import *

import operator

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

class wxGridSizer(wxPySizer):
    def __init__(self, rows=0, cols=0, hgap=0, vgap=0):
        wxPySizer.__init__(self)
        if rows == 0 and cols == 0:
            raise ValueError, "rows and cols cannot both be zero"

        self.rows = rows
        self.cols = cols
        self.hgap = hgap
        self.vgap = vgap


    def SetRows(self, rows):
        if rows == 0 and self.cols == 0:
            raise ValueError, "rows and cols cannot both be zero"
        self.rows = rows

    def SetColumns(self, cols):
        if self.rows == 0 and cols == 0:
            raise ValueError, "rows and cols cannot both be zero"
        self.cols = cols

    def GetRows(self):
        return self.rows

    def GetColumns(self):
        return self.cols

    def SetHgap(self, hgap):
        self.hgap = hgap

    def SetVgap(self, vgap):
        self.vgap = vgap

    def GetHgap(self, hgap):
        return self.hgap

    def GetVgap(self, vgap):
        return self.vgap

    #--------------------------------------------------
    def CalcMin(self):
        items = self.GetChildren()
        nitems = len(items)
        nrows = self.rows
        ncols = self.cols

        if ncols > 0:
            nrows = (nitems + ncols-1) / ncols
        else:
            ncols = (nitems + nrows-1) / nrows

        # Find the max width and height for any component.
        w = 0
        h = 0
        for item in items:
            size = item.CalcMin()
            w = max(w, size.width)
            h = max(h, size.height)

        return wxSize(ncols * w + (ncols-1) * self.hgap,
                      nrows * h + (nrows-1) * self.vgap)


    #--------------------------------------------------
    def RecalcSizes(self):
        items = self.GetChildren()
        if not items:
            return

        nitems = len(items)
        nrows = self.rows
        ncols = self.cols

        if ncols > 0:
            nrows = (nitems + ncols-1) / ncols
        else:
            ncols = (nitems + nrows-1) / nrows


        sz = self.GetSize()
        pt = self.GetPosition()
	w = (sz.width  - (ncols - 1) * self.hgap) / ncols;
	h = (sz.height - (nrows - 1) * self.vgap) / nrows;

        x = pt.x
        for c in range(ncols):
            y = pt.y
            for r in range(nrows):
                i = r * ncols + c
                if i < nitems:
                    self.SetItemBounds(items[i], x, y, w, h)
                y = y + h + self.vgap
            x = x + w + self.hgap


    #--------------------------------------------------
    def SetItemBounds(self, item, x, y, w, h):
        # calculate the item's size and position within
        # its grid cell
        ipt = wxPoint(x, y)
        isz = item.CalcMin()
        flag = item.GetFlag()

        if flag & wxEXPAND or flag & wxSHAPED:
            isz = wxSize(w, h)
        else:
            if flag & wxALIGN_CENTER_HORIZONTAL:
                ipt.x = x + (w - isz.width) / 2
            elif flag & wxALIGN_RIGHT:
                ipt.x = x + (w - isz.width)

            if flag & wxALIGN_CENTER_VERTICAL:
                ipt.y = y + (h - isz.height) / 2
            elif flag & wxALIGN_BOTTOM:
                ipt.y = y + (h - isz.height)

        item.SetDimension(ipt, isz)


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



class wxFlexGridSizer(wxGridSizer):
    def __init__(self, rows=0, cols=0, hgap=0, vgap=0):
        wxGridSizer.__init__(self, rows, cols, hgap, vgap)
        self.rowHeights = []
        self.colWidths  = []
        self.growableRows = []
        self.growableCols = []

    def AddGrowableRow(self, idx):
        self.growableRows.append(idx)

    def AddGrowableCol(self, idx):
        self.growableCols.append(idx)

    #--------------------------------------------------
    def CalcMin(self):
        items = self.GetChildren()
        nitems = len(items)
        nrows = self.rows
        ncols = self.cols

        if ncols > 0:
            nrows = (nitems + ncols-1) / ncols
        else:
            ncols = (nitems + nrows-1) / nrows

        # Find the max width and height for any component.
        self.rowHeights = [0] * nrows
        self.colWidths  = [0] * ncols
        for i in range(len(items)):
            size = items[i].CalcMin()
            row  = i / ncols
            col  = i % ncols
            self.rowHeights[row] = max(size.height, self.rowHeights[row])
            self.colWidths[col]  = max(size.width,  self.colWidths[col])

        # Add up all the widths and heights
        cellsWidth = reduce(operator.__add__, self.colWidths)
        cellHeight = reduce(operator.__add__, self.rowHeights)

        return wxSize(cellsWidth + (ncols-1) * self.hgap,
                      cellHeight + (nrows-1) * self.vgap)


    #--------------------------------------------------
    def RecalcSizes(self):
        items = self.GetChildren()
        if not items:
            return

        nitems = len(items)
        nrows = self.rows
        ncols = self.cols

        if ncols > 0:
            nrows = (nitems + ncols-1) / ncols
        else:
            ncols = (nitems + nrows-1) / nrows

        minsz = self.CalcMin()
        sz = self.GetSize()
        pt = self.GetPosition()

        # Check for growables
        if self.growableRows and sz.height > minsz.height:
            delta = (sz.height - minsz.height) / len(self.growableRows)
            for idx in self.growableRows:
                self.rowHeights[idx] = self.rowHeights[idx] + delta

        if self.growableCols and sz.width > minsz.width:
            delta = (sz.width - minsz.width) / len(self.growableCols)
            for idx in self.growableCols:
                self.colWidths[idx] = self.colWidths[idx] + delta

        # Layout each cell
        x = pt.x
        for c in range(ncols):
            y = pt.y
            for r in range(nrows):
                i = r * ncols + c
                if i < nitems:
                    w = max(0, min(self.colWidths[c], sz.width - x))
                    h = max(0, min(self.rowHeights[r], sz.height - y))
                    self.SetItemBounds(items[i], x, y, w, h)
                y = y + self.rowHeights[r] + self.vgap
            x = x + self.colWidths[c] + self.hgap

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