grid.py 文件源码

def expose(self, widget, event):
        if self.__force_full_redraw:
            self.__buffer_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 
                                                       self.__data.get_width(), 
                                                       self.__data.get_height())
            ctx = cairo.Context(self.__buffer_surface)
            self.__data.draw(ctx)
            self.__force_full_redraw = False
        ctx = widget.window.cairo_create()
        ctx.rectangle(event.area.x, event.area.y, 
                      event.area.width, event.area.height)
        ctx.clip()
        ctx.set_source_surface(self.__buffer_surface)
        ctx.paint()
        (x, y, width, height) = self.__data.get_selection_rectangle()
        if self.__moving_left:
            ctx.move_to(max(self.__moving_left_cur, 2), y)
            ctx.rel_line_to(0, height)
            ctx.close_path()
            ctx.set_line_width(1)
            ctx.set_source_rgb(0, 0, 0)
            ctx.stroke()
        if self.__moving_right:
            ctx.move_to(min(self.__moving_right_cur, self.__width - 2), y)
            ctx.rel_line_to(0, height)
            ctx.close_path()
            ctx.set_line_width(1)
            ctx.set_source_rgb(0, 0, 0)
            ctx.stroke()
        if self.__moving_both:
            delta_x = self.__moving_both_cur - self.__moving_both_start
            left_x = x + delta_x
            ctx.move_to(x + delta_x, y)
            ctx.rel_line_to(0, height)
            ctx.close_path()
            ctx.move_to(x + width + delta_x, y)
            ctx.rel_line_to(0, height)
            ctx.close_path()
            ctx.set_source_rgb(0, 0, 0)
            ctx.set_line_width(1)
            ctx.stroke()
        return False