# -*- coding: utf-8 -*-
#
# Copyright © 2019 Simon Forman
#
# This file is part of joy.py
#
# joy.py is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# joy.py is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with joy.py. If not see <http://www.gnu.org/licenses/>.
#
'''
Viewer
=================
'''
import pygame
from joy.vui.core import BACKGROUND, FOREGROUND
[docs]class Viewer(object):
'''
Base Viewer class
'''
MINIMUM_HEIGHT = 11
def __init__(self, surface):
self.resurface(surface)
self.last_touch = 0, 0
def resurface(self, surface):
self.w, self.h = surface.get_width(), surface.get_height()
self.surface = surface
[docs] def split(self, y):
'''
Split the viewer at the y coordinate (which is relative to the
viewer's surface and must be inside it somewhere) and return the
remaining height. The upper part of the viewer remains (and gets
redrawn on a new surface) and the lower space is now available
for e.g. a new viewer.
'''
assert y >= self.MINIMUM_HEIGHT
new_viewer_h = self.h - y
self.resurface(self.surface.subsurface((0, 0, self.w, y)))
if y <= self.last_touch[1]: self.last_touch = 0, 0
self.draw()
return new_viewer_h
def handle(self, message):
assert self is not message.sender
pass
[docs] def draw(self):
'''Draw the viewer onto its surface.'''
self.surface.fill(BACKGROUND)
x, y, h = self.w - 1, self.MINIMUM_HEIGHT, self.h - 1
# Right-hand side.
pygame.draw.line(self.surface, FOREGROUND, (x, 0), (x, h))
# Between header and body.
pygame.draw.line(self.surface, FOREGROUND, (0, y), (x, y))
# Bottom.
pygame.draw.line(self.surface, FOREGROUND, (0, h), (x, h))
[docs] def close(self):
'''Close the viewer and release any resources, etc...'''
def focus(self, display):
pass
def unfocus(self):
pass
# Event handling.
def mouse_down(self, display, x, y, button):
self.last_touch = x, y
def mouse_up(self, display, x, y, button):
pass
def mouse_motion(self, display, x, y, dx, dy, button0, button1, button2):
pass
def key_up(self, display, key, mod):
if key == pygame.K_q and mod & pygame.KMOD_CTRL: # Ctrl-q
display.close_viewer(self)
return True
if key == pygame.K_g and mod & pygame.KMOD_CTRL: # Ctrl-g
display.grow_viewer(self)
return True
def key_down(self, display, uch, key, mod):
pass
[docs]class SomeViewer(MenuViewer):
def __init__(self, surface):
MenuViewer.__init__(self, surface)
def resurface(self, surface):
MenuViewer.resurface(self, surface)
def draw_menu(self):
MenuViewer.draw_menu(self)
def draw_body(self):
pass
def body_click(self, display, x, y, button):
pass
def menu_click(self, display, x, y, button):
if MenuViewer.menu_click(self, display, x, y, button):
return True
def mouse_up(self, display, x, y, button):
if MenuViewer.mouse_up(self, display, x, y, button):
return True
def mouse_motion(self, display, x, y, rel_x, rel_y, button0, button1, button2):
if MenuViewer.mouse_motion(self, display, x, y, rel_x, rel_y,
button0, button1, button2):
return True
def key_down(self, display, uch, key, mod):
try:
print chr(key),
except ValueError:
pass
# Note that Oberon book says that if you split at the exact top of a viewer
# it should close, and I think this implies the new viewer gets the old
# viewer's whole height. I haven't implemented that yet, so the edge-case
# in the code is broken by "intent" for now..
def draw_a(surface, color=FOREGROUND, blend=False):
w, h = surface.get_width() - 2, surface.get_height() - 2
pygame.draw.aalines(surface, color, False, (
(1, h), (w / 2, 1), (w, h), (1, h / 2)
), blend)