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#file: scrollbar.py
#Copyright (C) 2008 FunnyMan3595
#This file is part of Endgame: Singularity.
#Endgame: Singularity 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.
#Endgame: Singularity 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 Endgame: Singularity; if not, write to the Free Software
#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#This file contains the scrollbar widget.
import pygame
import constants
import g
import widget
import button
import slider
class _ArrowButton(button.FunctionButton, button.ImageButton):
def __init__(self, parent, *args, **kwargs):
self.first = kwargs.pop("first", True)
self.horizontal = kwargs.pop("horizontal", False)
kwargs["function"] = parent.adjust
kwargs["args"] = (self.first,)
super(_ArrowButton, self).__init__(parent, *args, **kwargs)
base_image = g.images['arrow.png']
if self.first and self.horizontal:
angle = 90
self.borders = (constants.LEFT, constants.TOP, constants.BOTTOM)
elif self.first:
angle = 0
self.borders = (constants.LEFT, constants.TOP, constants.RIGHT)
elif self.horizontal:
angle = -90
self.borders = (constants.TOP, constants.RIGHT, constants.BOTTOM)
else:
angle = -180
self.borders = (constants.RIGHT, constants.BOTTOM, constants.LEFT)
rotated_image = pygame.transform.rotate(base_image, angle)
self.image.image = rotated_image.convert_alpha()
class Scrollbar(widget.Widget):
scroll_pos = widget.causes_rebuild("_scroll_pos")
elements = widget.causes_rebuild("_elements")
window = widget.causes_rebuild("_window")
horizontal = widget.causes_rebuild("_horizontal")
def __init__(self, parent, pos = (-1,0), size = (.025, -1),
anchor = constants.TOP_RIGHT, scroll_pos = 0,
elements = 15, window = 5, horizontal = False):
super(Scrollbar, self).__init__(parent, pos, size, anchor)
self.scroll_pos = scroll_pos
self.elements = elements
self.window = window
self.horizontal = horizontal
self.slider = slider.UpdateSlider(self, (-.5,-.5), None,
anchor = constants.MID_CENTER,
horizontal = horizontal,
update_func = self.on_change)
self.button1 = _ArrowButton(self, (0,0), None,
anchor = constants.TOP_LEFT,
first = True, horizontal = horizontal,
priority = 90)
self.button2 = _ArrowButton(self, (-1,-1), None,
anchor = constants.BOTTOM_RIGHT,
first = False, horizontal = horizontal,
priority = 90)
def resize(self):
super(Scrollbar, self).resize()
if self.horizontal:
long = self.real_size[0]
short = self.real_size[1]
size = short / float(long)
self.button1.size = (-size, -1)
self.button2.size = (-size, -1)
self.slider.size = ((size * 2) - 1, -1)
else:
long = self.real_size[1]
short = self.real_size[0]
size = short / float(long)
self.button1.size = (-1, -size)
self.button2.size = (-1, -size)
self.slider.size = (-1, (size * 2) - 1)
def rebuild(self):
self.slider.slider_max = slider.calc_max(self.elements, self.window)
self.scroll_pos = min(self.scroll_pos, self.slider.slider_max)
self.slider.slider_pos = self.scroll_pos
self.slider.slider_size = self.window
self.needs_redraw = True
super(Scrollbar, self).rebuild()
def adjust(self, lower):
if lower:
self.slider.slider_pos = self.slider.safe_pos(self.scroll_pos - 1)
else:
self.slider.slider_pos = self.slider.safe_pos(self.scroll_pos + 1)
def center(self, element):
self.slider.slider_pos = self.slider.safe_pos(element - self.window//2)
def scroll_to(self, element):
if element < self.scroll_pos:
self.slider.slider_pos = self.slider.safe_pos(element)
elif element >= self.scroll_pos + self.window:
self.slider.slider_pos = self.slider.safe_pos(element - self.window
+ 1)
def on_change(self, value):
self.scroll_pos = value
class UpdateScrollbar(Scrollbar):
def __init__(self, *args, **kwargs):
self.update_func = kwargs.pop("update_func", lambda value: None)
super(UpdateScrollbar, self).__init__(*args, **kwargs)
def on_change(self, value):
self.scroll_pos = value
self.update_func(value)
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