from pygame import Rect
from widget import Widget

class GridView(Widget):
	#  cell_size   (width, height)   size of each cell
	#
	#  Abstract methods:
	#
	#    num_rows()  -->  no. of rows
	#    num_cols()  -->  no. of columns
	#    draw_cell(surface, row, col, rect)
	#    click_cell(row, col, event)

	def __init__(self, cell_size, nrows, ncols, **kwds):
		"""nrows, ncols are for calculating initial size of widget"""
		Widget.__init__(self, **kwds)
		self.cell_size = cell_size
		w, h = cell_size
		d = 2 * self.margin
		self.size = (w * ncols + d, h * nrows + d)
		self.cell_size = cell_size
	
	def draw(self, surface):
		for row in xrange(self.num_rows()):
			for col in xrange(self.num_cols()):
				r = self.cell_rect(row, col)
				self.draw_cell(surface, row, col, r)
		
	def cell_rect(self, row, col):
		w, h = self.cell_size
		d = self.margin
		x = col * w + d
		y = row * h + d
		return Rect(x, y, w, h)
		
	def draw_cell(self, surface, row, col, rect):
		pass

	def mouse_down(self, event):
		if event.button == 1:
			x, y = event.local
			w, h = self.cell_size
			W, H = self.size
			d = self.margin
			if d <= x < W - d and d <= y < H - d:
				row = (y - d) // h
				col = (x - d) // w
				self.click_cell(row, col, event)
	
	def click_cell(self, row, col, event):
		pass
