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#file: listbox.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 listbox widget.
import pygame
import constants
import g
import widget
import text
import scrollbar
class Listbox(widget.FocusWidget, text.SelectableText):
list = widget.causes_rebuild("_list")
align = widget.causes_redraw("_align")
list_size = widget.causes_rebuild("_list_size")
list_pos = widget.causes_rebuild("_list_pos")
def __init__(self, parent, pos, size, anchor=constants.TOP_LEFT, list=None,
list_pos=0, list_size=-20, borders=constants.ALL,
align=constants.CENTER, **kwargs):
super(Listbox, self).__init__(parent, pos, size, anchor = anchor,
**kwargs)
self.list = list or []
self.display_elements = []
self.borders = borders
self.align = align
self.list_size = list_size
self.list_pos = list_pos
self.auto_scroll = True
self.scrollbar = scrollbar.UpdateScrollbar(self,
update_func = self.on_scroll)
def add_hooks(self):
super(Listbox, self).add_hooks()
self.parent.add_handler(constants.CLICK, self.on_click, 90)
self.parent.add_key_handler(pygame.K_UP, self.got_key)
self.parent.add_key_handler(pygame.K_DOWN, self.got_key)
self.parent.add_key_handler(pygame.K_PAGEUP, self.got_key)
self.parent.add_key_handler(pygame.K_PAGEDOWN, self.got_key)
def remove_hooks(self):
super(Listbox, self).remove_hooks()
self.parent.remove_handler(constants.CLICK, self.on_click)
self.parent.remove_key_handler(pygame.K_UP, self.got_key)
self.parent.remove_key_handler(pygame.K_DOWN, self.got_key)
self.parent.remove_key_handler(pygame.K_PAGEUP, self.got_key)
self.parent.remove_key_handler(pygame.K_PAGEDOWN, self.got_key)
def on_scroll(self, scroll_pos):
self.needs_rebuild = True
def on_click(self, event):
if self.collision_rect.collidepoint(event.pos):
self.has_focus = True
self.took_focus(self)
# Figure out which element was clicked...
local_vert_abs = event.pos[1] - self.collision_rect[1]
local_vert_pos = local_vert_abs / float(self.collision_rect.height)
index = int(local_vert_pos * len(self.display_elements))
# ... and select it.
self.list_pos = self.safe_pos(index + self.scrollbar.scroll_pos)
def safe_pos(self, raw_pos):
return max(0, min(len(self.list) - 1, raw_pos))
def got_key(self, event):
if not self.has_focus:
return
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP:
new_pos = self.list_pos - 1
elif event.key == pygame.K_DOWN:
new_pos = self.list_pos + 1
elif event.key == pygame.K_PAGEUP:
new_pos = self.list_pos - (self.scrollbar.window - 1)
elif event.key == pygame.K_PAGEDOWN:
new_pos = self.list_pos + (self.scrollbar.window - 1)
else:
return
self.list_pos = self.safe_pos(new_pos)
self.scrollbar.scroll_to(self.list_pos)
raise constants.Handled
def num_elements(self):
# If self.list_size is negative, we interpret it as a minimum height
# for each element and calculate the number of elements to show.
list_size = self.list_size
if list_size < 0:
min_height = -list_size
list_size = max(1, self._make_collision_rect().height // min_height)
return list_size
def remake_elements(self):
list_size = self.num_elements()
current_size = len(self.display_elements)
if current_size > list_size:
# Remove the excess ones.
for child in self.display_elements[list_size:]:
child.remove_hooks()
del self.display_elements[list_size:]
elif current_size < list_size:
if current_size > 0:
self.display_elements[-1].borders = \
(constants.LEFT, constants.TOP)
# Create the new ones.
for i in range(list_size - current_size):
self.display_elements.append(self.make_element())
self.display_elements[-1].borders = (constants.TOP, constants.LEFT,
constants.BOTTOM)
# Move the scrollbar to the end so that it gets drawn on top.
self.children.remove(self.scrollbar)
self.children.append(self.scrollbar)
def make_element(self):
return text.SelectableText(self, None, None, anchor=constants.TOP_LEFT,
borders=(constants.TOP, constants.LEFT),
border_color=self.border_color,
selected_color=self.selected_color,
unselected_color=self.unselected_color,
align=self.align)
def resize(self):
super(Listbox, self).resize()
if self.num_elements() != len(self.display_elements):
self.remake_elements()
self.scrollbar.resize()
self.rebuild()
def rebuild(self):
self.list_pos = self.safe_pos(self.list_pos)
if self.needs_resize:
self.resize()
return
window_size = len(self.display_elements)
list_size = len(self.list)
self.scrollbar.window = len(self.display_elements)
self.scrollbar.elements = list_size
if self.auto_scroll:
self.auto_scroll = False
self.scrollbar.center(self.list_pos)
self.scrollbar.rebuild()
scrollbar_width = self.scrollbar.real_size[0]
my_width = self.real_size[0]
scrollbar_rel_width = scrollbar_width / float(my_width)
offset = self.scrollbar.scroll_pos
for index, element in enumerate(self.display_elements):
list_index = index + offset
# Position and size the element.
element.pos = (0, -index / float(window_size))
element.size = (-1 + scrollbar_rel_width, -1 / float(window_size))
# Set up the element contents.
element.selected = (list_index == self.list_pos)
self.update_element(element, list_index)
self.needs_redraw = True
super(Listbox, self).rebuild()
def update_element(self, element, list_index):
if 0 <= list_index < len(self.list):
element.text = self.list[list_index]
else:
element.text = ""
class UpdateListbox(Listbox):
def _on_selection_change(self):
self.update_func(self.list_pos)
_list_pos = widget.call_on_change("__list_pos", _on_selection_change)
def __init__(self, *args, **kwargs):
self.update_func = kwargs.pop("update_func", lambda value: None)
super(UpdateListbox, self).__init__(*args, **kwargs)
class CustomListbox(UpdateListbox):
remake_func = widget.causes_rebuild("_remake_func")
rebuild_func = widget.causes_rebuild("_rebuild_func")
def __init__(self, parent, *args, **kwargs):
self.parent = parent
self.remake_func = kwargs.pop("remake_func", lambda value: None)
self.rebuild_func = kwargs.pop("rebuild_func", lambda value: None)
super(CustomListbox, self).__init__(parent, *args, **kwargs)
def make_element(self):
base = super(CustomListbox, self).make_element()
self.remake_func(base)
return base
def update_element(self, element, list_index):
if 0 <= list_index < len(self.list):
self.rebuild_func(element, self.list[list_index],
self.key_list[list_index])
else:
self.rebuild_func(element, None, None)
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