import cairo import gobject import goocanvas class GridConstraints: def __init__(self, x, y, width, height, padding=0): self.x = x self.y = y self.width = width self.height = height self.padding = padding class GridLayout: def __init__(self, cols=16, rows=12): self._rows = rows self._cols = cols self._constraints = {} def set_constraints(self, component, constraints): self._constraints[component] = constraints if isinstance(component, goocanvas.Item): self.layout_canvas_item(component) def _get_geometry(self, container, component): constraints = self._constraints[component] if constraints: return self.get_bounds(container, constraints) else: return [0, 0, 0, 0] def get_bounds(self, container, constraints): w = container.props.width h = container.props.height padding = constraints.padding x = constraints.x * w / self._cols + padding y = constraints.y * h / self._rows + padding width = constraints.width * w / self._cols - padding * 2 height = constraints.height * h / self._rows - padding * 2 width = max(0, width) height = max(0, height) return [x, y, width, height] def layout_canvas_item(self, item): group = item.get_parent() if group == None: return [x, y, width, height] = self._get_geometry(group, item) item.props.x = x item.props.y = y try: item.props.width = width item.props.height = height except: item.props.size = width def layout_screen(self, screen): for window in screen.get_windows(): [x, y, width, height] = self._get_geometry(screen, window) window.move(int(x), int(y)) window.resize(int(width), int(height)) class GridGroup(goocanvas.Group): __gproperties__ = { 'x' : (float, None, None, -10e6, 10e6, 800.0, gobject.PARAM_READWRITE), 'y' : (float, None, None, -10e6, 10e6, 600.0, gobject.PARAM_READWRITE), 'width' : (float, None, None, 0, 10e6, 800.0, gobject.PARAM_READWRITE), 'height' : (float, None, None, 0, 10e6, 600.0, gobject.PARAM_READWRITE) } def _update_position(self): if self._x != 0 or self._y != 0: matrix = cairo.Matrix(1, 0, 0, 1, 0, 0) matrix.translate(self._x, self._y) self.set_transform(matrix) def _update_layout(self): i = 0 while i < self.get_n_children(): self._layout.layout_canvas_item(self.get_child(i)) i += 1 def do_set_property(self, pspec, value): if pspec.name == 'width': self._width = value self._update_layout() elif pspec.name == 'height': self._height = value self._update_layout() elif pspec.name == 'x': self._x = value self._update_position() elif pspec.name == 'y': self._y = value self._update_position() def do_get_property(self, pspec): if pspec.name == 'width': return self._width elif pspec.name == 'height': return self._height elif pspec.name == 'x': return self._x elif pspec.name == 'x': return self._x def __init__(self, cols=-1, rows=-1): self._x = 0 self._y = 0 self._width = 0 self._height = 0 goocanvas.Group.__init__(self) if rows < 0 and cols < 0: self._layout = GridLayout() else: self._layout = GridLayout(cols, rows) self.connect('child-added', self.__child_added_cb) def get_layout(self): return self._layout def __child_added_cb(self, group, position): item = group.get_child(position) self._layout.layout_canvas_item(item)