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/usr/share/games/fretsonfire/game/Menu.py is in fretsonfire-game 1.3.110.dfsg2-2.

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#####################################################################
# -*- coding: iso-8859-1 -*-                                        #
#                                                                   #
# Frets on Fire                                                     #
# Copyright (C) 2006 Sami Kyöstilä                                  #
#                                                                   #
# This program 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 2    #
# of the License, or (at your option) any later version.            #
#                                                                   #
# This program 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 this program; if not, write to the Free Software       #
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,        #
# MA  02110-1301, USA.                                              #
#####################################################################

import pygame
from OpenGL.GL import *
import math

from View import Layer
from Input import KeyListener
import Data
import Theme
import Dialogs
import Player

class Choice:
  def __init__(self, text, callback, values = None, valueIndex = 0):
    self.text       = unicode(text)
    self.callback   = callback
    self.values     = values
    self.valueIndex = valueIndex
  
    if self.text.endswith(" >"):
      self.text = text[:-2]
      self.isSubMenu = True
    else:
      self.isSubMenu = isinstance(self.callback, Menu) or isinstance(self.callback, list)
    
  def trigger(self, engine = None):
    if engine and isinstance(self.callback, list):
      nextMenu = Menu(engine, self.callback)
    elif engine and isinstance(self.callback, Menu):
      nextMenu = self.callback
    elif self.values:
      nextMenu = self.callback(self.values[self.valueIndex])
    else:
      nextMenu = self.callback()
    if isinstance(nextMenu, Menu):
      engine.view.pushLayer(nextMenu)
      
  def selectNextValue(self):
    if self.values:
      self.valueIndex = (self.valueIndex + 1) % len(self.values)
      self.trigger()

  def selectPreviousValue(self):
    if self.values:
      self.valueIndex = (self.valueIndex - 1) % len(self.values)
      self.trigger()
      
  def getText(self, selected):
    if not self.values:
      if self.isSubMenu:
        return "%s >" % self.text
      return self.text
    if selected:
      return "%s: %s%s%s" % (self.text, Data.LEFT, self.values[self.valueIndex], Data.RIGHT)
    else:
      return "%s: %s" % (self.text, self.values[self.valueIndex])
          
class Menu(Layer, KeyListener):
  def __init__(self, engine, choices, onClose = None, onCancel = None, pos = (.2, .66 - .35), viewSize = 6, fadeScreen = False):
    self.engine       = engine
    self.choices      = []
    self.currentIndex = 0
    self.time         = 0
    self.onClose      = onClose
    self.onCancel     = onCancel
    self.viewOffset   = 0
    self.pos          = pos
    self.viewSize     = viewSize
    self.fadeScreen   = fadeScreen
    
    for c in choices:
      try:
        text, callback = c
        if isinstance(text, tuple):
          c = Choice(text[0], callback, values = text[2], valueIndex = text[1])
        else:
          c = Choice(text, callback)
      except TypeError:
        pass
      self.choices.append(c)
      
  def selectItem(self, index):
    self.currentIndex = index
    
  def shown(self):
    self.engine.input.addKeyListener(self)
    self.engine.input.enableKeyRepeat()
    
  def hidden(self):
    self.engine.input.removeKeyListener(self)
    self.engine.input.disableKeyRepeat()
    if self.onClose:
      self.onClose()

  def updateSelection(self):
    if self.currentIndex > self.viewOffset + self.viewSize - 1:
      self.viewOffset = self.currentIndex - self.viewSize + 1
    if self.currentIndex < self.viewOffset:
      self.viewOffset = self.currentIndex
    
  def keyPressed(self, key, unicode):
    self.time = 0
    choice = self.choices[self.currentIndex]
    c = self.engine.input.controls.getMapping(key)
    if c in [Player.KEY1] or key == pygame.K_RETURN:
      choice.trigger(self.engine)
      self.engine.data.acceptSound.play()
    elif c in [Player.CANCEL, Player.KEY2]:
      if self.onCancel:
        self.onCancel()
      self.engine.view.popLayer(self)
      self.engine.input.removeKeyListener(self)
      self.engine.data.cancelSound.play()
    elif c in [Player.DOWN, Player.ACTION2]:
      self.currentIndex = (self.currentIndex + 1) % len(self.choices)
      self.updateSelection()
      self.engine.data.selectSound.play()
    elif c in [Player.UP, Player.ACTION1]:
      self.currentIndex = (self.currentIndex - 1) % len(self.choices)
      self.updateSelection()
      self.engine.data.selectSound.play()
    elif c in [Player.RIGHT, Player.KEY4]:
      choice.selectNextValue()
    elif c in [Player.LEFT, Player.KEY3]:
      choice.selectPreviousValue()
    return True
    
  def run(self, ticks):
    self.time += ticks / 50.0

  def renderTriangle(self, up = (0, 1), s = .2):
    left = (-up[1], up[0])
    glBegin(GL_TRIANGLES)
    glVertex2f( up[0] * s,  up[1] * s)
    glVertex2f((-up[0] + left[0]) * s, (-up[1] + left[1]) * s)
    glVertex2f((-up[0] - left[0]) * s, (-up[1] - left[1]) * s)
    glEnd()
  
  def render(self, visibility, topMost):
    if not visibility:
      return

    self.engine.view.setOrthogonalProjection(normalize = True)
    try:
      v = (1 - visibility) ** 2
      font = self.engine.data.font

      if self.fadeScreen:
        Dialogs.fadeScreen(v)
      
      glEnable(GL_BLEND)
      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
      glEnable(GL_COLOR_MATERIAL)

      n = len(self.choices)
      x, y = self.pos
      w, h = font.getStringSize("_")

      for i, choice in enumerate(self.choices[self.viewOffset:self.viewOffset + self.viewSize]):
        text = choice.getText(i + self.viewOffset == self.currentIndex)
        glPushMatrix()
        glRotate(v * 45, 0, 0, 1)

        # Draw arrows if scrolling is needed to see all items
        if i == 0 and self.viewOffset > 0:
          Theme.setBaseColor((1 - v) * max(.1, 1 - (1.0 / self.viewOffset) / 3))
          glPushMatrix()
          glTranslatef(x - v / 4 - w * 2, y + h / 2, 0)
          self.renderTriangle(up = (0, -1), s = .015)
          glPopMatrix()
        elif i == self.viewSize - 1 and self.viewOffset + self.viewSize < n:
          Theme.setBaseColor((1 - v) * max(.1, 1 - (1.0 / (n - self.viewOffset - self.viewSize)) / 3))
          glPushMatrix()
          glTranslatef(x - v / 4 - w * 2, y + h / 2, 0)
          self.renderTriangle(up = (0, 1), s = .015)
          glPopMatrix()

        if i + self.viewOffset == self.currentIndex:
          a = (math.sin(self.time) * .15 + .75) * (1 - v * 2)
          Theme.setSelectedColor(a)
          a *= -.005
          glTranslatef(a, a, a)
        else:
          Theme.setBaseColor(1 - v)

        font.render(text, (x - v / 4, y))
        v *= 2
        y += h
        glPopMatrix()
    finally:
      self.engine.view.resetProjection()