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# !/usr/bin/python
# -*- coding: utf-8 -*-
# Glitter Toolkit
__authors__ = ["Jan Jokela <janjokela@gmail.com>"]
__licenses__ = ["LICENSE.LGPL"]
__description__ = "List widget"
import gobject
import clutter
from widget import *
from container import Container
from box import VBox
from image import Image
from scroll_area import ScrollArea
from scrollable import Scrollable
class List(Container, Scrollable):
"""
A list widget offers an item list where any item can have a combination of
text and icon. There is also support for a selector of the current item
for non-touch interfaces.
The list widget implements the scrollable interface.
"""
__gsignals__ = {
'selection-changed': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_BOOLEAN,
(gobject.TYPE_PYOBJECT,)),
'view-changed': (gobject.SIGNAL_RUN_LAST, gobject.TYPE_BOOLEAN,
(gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,))
}
def __init__(self):
""" Initialize list """
super(List, self).__init__()
super(Scrollable, self).__init__()
self._stage = None
self.set_reactive(True)
self.connect('button-release-event', self.on_release_event)
self.connect('scroll-event', self.on_scroll_event)
self.items = []
self._show_selection = None
self._selected = None
self._init_elements()
self._init_animations()
self._update_style(self.style)
def _init_elements(self):
""" Initializes graphical elements """
self._background_image = Image()
self.add(self._background_image)
self._vbox = VBox()
self.add(self._vbox)
self._selection_image = None
def _init_animations(self):
""" Initializes animations """
self._timeline = None
def _update_style(self, props=None):
""" Updates style """
super(List, self)._update_style(props)
for key, value in props:
if key == 'background-image':
self.background_image = value
self._background_image.set_source(self.background_image)
self._background_image._update_layout()
elif key == 'selection-image':
self.selection_image = value
if not self._selection_image:
self._selection_image = Image()
self._vbox.add(self._selection_image)
self._selection_image.set_source(self.selection_image)
self._selection_image._update_layout()
def _update_layout(self):
""" Updates layout """
super(List, self)._update_layout()
# Subscribe to key-press events
if not self._stage:
self._stage = self.get_stage()
self._stage.connect('key-press-event', self.on_key_press_event)
# Update list background image and vbox
self._background_image._update_layout()
self._vbox._update_layout()
# Update selection image size and position
if self._selection_image:
if not self.selected:
if self._vbox.get_item_natural_height(0) > 0:
self._selection_image.natural_height = self._vbox.get_item_natural_height(0)
self._selection_image._update_layout()
else:
self._selection_image.natural_height = self._vbox.get_item_natural_height(self.selected)
self._selection_image._update_layout()
self._selection_image.set_y(self._vbox.get_item(self.selected).get_y())
# Update childs
for item in self.items:
item._update_layout()
# Set clip
self.set_clipu(0, 0, self.get_widthu(), self.get_heightu())
def append(self, item):
""" Appends an item to the list """
self.items.append(item)
self._vbox.pack(item)
if self.selected == None:
self.selected = 0
self._update_layout()
def remove(self):
""" Remove item from list """
self.items.remove(item)
self._vbox.unpack(item)
self._update_layout()
def get_show_selection(self):
""" Retrieve whether selection is to be displayed """
return self._show_selection
def set_show_selection(self, value):
""" Sets whether selection is to be displayed
value -- (boolean) whether to display selection or not
"""
self._show_selection = value
show_selection = property(get_show_selection, set_show_selection)
def get_selected(self):
""" Retrieve selected item """
return self._selected
def set_selected(self, item):
""" Sets item as selected
item -- (widget) a widget
"""
self._selected = item
self.emit("selection-changed", self._vbox.get_item(item))
# Emit a signal and change selector position case we have one
if self._selection_image:
# The new allocation box for the reference widget
new_alloc_boxu = (
-1,
self._vbox.get_item(item).get_y(),
-1,
self._selection_image.get_heightu()
)
self.emit("view-changed", new_alloc_boxu, 0.1)
# Animation for switching between selected items in list
if not self._timeline:
self._timeline = clutter.Timeline(fps=60, duration=200)
if self._timeline.is_playing():
self._timeline.stop()
self._timeline = clutter.Timeline(fps=60, duration=200)
alpha = clutter.Alpha(self._timeline, clutter.sine_inc_func)
self._behaviour = clutter.BehaviourPath(alpha)
self._behaviour.append_knots(
(0, self._selection_image.get_y()),
(0, self._vbox.get_item(item).get_y())
)
self._behaviour.apply(self._selection_image)
self._timeline.start()
selected = property(get_selected, set_selected)
def on_release_event(self, widget, event):
""" Button release event """
print widget
def on_scroll_event(self, widget, event):
""" Scroll event """
if event.direction == clutter.SCROLL_UP:
if self.selected > 0:
self.selected -= 1
#self.get_parent().get_parent()._scroll_down(px=self._vbox.get_item(self.selected).get_y())
else:
return True
elif event.direction == clutter.SCROLL_DOWN:
if self.selected < len(self.items)-1:
self.selected += 1
#self.get_parent().get_parent()._scroll_up(px=self._vbox.get_item(self.selected).get_y())
else:
return True
elif event.direction == clutter.SCROLL_LEFT:
pass
elif event.direction == clutter.SCROLL_RIGHT:
pass
return True
def on_key_press_event(self, widget, event):
""" Key event """
if event.keyval == clutter.keysyms.Up:
if self.selected > 0:
self.selected -= 1
elif event.keyval == clutter.keysyms.Down:
if self.selected < len(self.items)-1:
self.selected += 1
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