#---------------------------------------------------------------------------
#
#   PyGUI - Grid layout component - Generic
#
#---------------------------------------------------------------------------

from LayoutUtils import equalize_components
from GUI import Frame, export

class Grid(Frame):

    def __init__(self, items, row_spacing = 5, column_spacing = 10,
            align = 'l', equalize = '', expand_row = None, expand_column = None,
            padding = (0, 0), **kwds):
        Frame.__init__(self)
        hpad, vpad = padding
        num_rows = len(items)
        num_cols = max([len(row) for row in items])
        col_widths = [0] * num_cols
        row_heights = [0] * num_rows
        for i, row in enumerate(items):
            for j, item in enumerate(row):
                if item:
                    row_heights[i] = max(row_heights[i], item.height)
                    col_widths[j] = max(col_widths[j], item.width)
        tot_width = 0
        row_top = 0
        row_gap = 0
        vanchor = 't'
        for i, row in enumerate(items):
            row_height = row_heights[i]
            row_top += row_gap
            col_left = 0
            col_gap = 0
            hanchor = 'l'
            if i == expand_row:
                vanchor = 'tb'
            for j, item in enumerate(row):
                col_width = col_widths[j]
                col_left += col_gap
                if item:
                    if 'l' in align:
                        x = 0
                    elif 'r' in align:
                        x = col_width - item.width
                    else:
                        x = (col_width - item.width) // 2
                    if 't' in align:
                        y = 0
                    elif 'b' in align:
                        y = row_height - item.height
                    else:
                        y = (row_height - item.height) // 2
                    item.position = (hpad + col_left + x, vpad + row_top + y)
                    if j == expand_column:
                        item.anchor = 'lr' + vanchor
                    else:
                        item.anchor = hanchor + vanchor
                    self.add(item)
                if j == expand_column:
                    hanchor = 'r'
                col_left += col_width
                col_gap = column_spacing
                tot_width = max(tot_width, col_left)
            if i == expand_row:
                vanchor = 'b'
            row_top += row_height
            row_gap = row_spacing
        tot_height = row_top
        self.size = (tot_width + 2 * hpad, tot_height + 2 * vpad)
        self.set(**kwds)

export(Grid)