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from __future__ import division
import logging
logger = logging.getLogger(__name__.split(".")[0])
import urwid
from urwid_utils.palette import *
class ListBoxScrollBar(urwid.WidgetWrap):
def __init__(self, parent):
self.parent = parent
self.pile = urwid.Pile([])
super(ListBoxScrollBar, self).__init__(self.pile)
def update(self, size):
width, height = size
scroll_marker_height = 1
del self.pile.contents[:]
if (len(self.parent.body)
and self.parent.row_count
and self.parent.focus is not None
and self.parent.row_count > height):
scroll_position = int(
self.parent.focus_position / self.parent.row_count * height
)
scroll_marker_height = max( height * (height / self.parent.row_count ), 1)
else:
scroll_position = -1
pos_marker = urwid.AttrMap(urwid.Text(" "),
{None: "scroll_pos"}
)
down_marker = urwid.AttrMap(urwid.Text(u"\N{DOWNWARDS ARROW}"),
{None: "scroll_marker"}
)
begin_marker = urwid.AttrMap(urwid.Text(u"\N{CIRCLED MINUS}"),
{None: "scroll_marker"}
)
end_marker = urwid.AttrMap(urwid.Text(u"\N{CIRCLED PLUS}"),
{None: "scroll_marker"}
)
view_marker = urwid.AttrMap(urwid.Text(" "),
{None: "scroll_view"}
)
bg_marker = urwid.AttrMap(urwid.Text(" "),
{None: "scroll_bg"}
)
for i in range(height):
if abs( i - scroll_position ) <= scroll_marker_height//2:
if i == 0 and self.parent.focus_position == 0:
marker = begin_marker
elif i+1 == height and self.parent.row_count == self.parent.focus_position+1:
marker = end_marker
elif len(self.parent.body) == self.parent.focus_position+1 and i == scroll_position + scroll_marker_height//2:
marker = down_marker
else:
marker = pos_marker
else:
if i < scroll_position:
marker = view_marker
elif self.parent.row_count and i/height < ( len(self.parent.body) / self.parent.row_count):
marker = view_marker
else:
marker = bg_marker
self.pile.contents.append(
(urwid.Filler(marker), self.pile.options("weight", 1))
)
self._invalidate()
def selectable(self):
# FIXME: mouse click/drag
return False
class ScrollingListBox(urwid.WidgetWrap):
signals = ["select",
"drag_start", "drag_continue", "drag_stop",
"load_more"]
def __init__(self, body,
infinite = False,
with_scrollbar=False,
scroll_rows=None,
row_count_fn = None):
self.infinite = infinite
self.with_scrollbar = with_scrollbar
self.scroll_rows = scroll_rows
self.row_count_fn = row_count_fn
self.mouse_state = 0
self.drag_from = None
self.drag_last = None
self.drag_to = None
self.load_more = False
self.height = 0
self.page = 0
self.queued_keypress = None
self.listbox = urwid.ListBox(body)
self.columns = urwid.Columns([
('weight', 1, self.listbox)
])
if self.with_scrollbar:
self.scroll_bar = ListBoxScrollBar(self)
self.columns.contents.append(
(self.scroll_bar, self.columns.options("given", 1))
)
super(ScrollingListBox, self).__init__(self.columns)
@classmethod
def get_palette_entries(cls):
return {
"scroll_pos": PaletteEntry(
mono = "white",
foreground = "black",
background = "white",
foreground_high = "black",
background_high = "white"
),
"scroll_marker": PaletteEntry(
mono = "white,bold",
foreground = "black,bold",
background = "white",
foreground_high = "black,bold",
background_high = "white"
),
"scroll_view": PaletteEntry(
mono = "black",
foreground = "black",
background = "light gray",
foreground_high = "black",
background_high = "g50"
),
"scroll_bg": PaletteEntry(
mono = "black",
foreground = "light gray",
background = "dark gray",
foreground_high = "light gray",
background_high = "g23"
),
}
def mouse_event(self, size, event, button, col, row, focus):
SCROLL_WHEEL_HEIGHT_RATIO = 0.5
if row < 0 or row >= self.height:
return
if event == 'mouse press':
if button == 1:
self.mouse_state = 1
self.drag_from = self.drag_last = (col, row)
elif button == 4:
pos = self.listbox.focus_position - int(self.height * SCROLL_WHEEL_HEIGHT_RATIO)
if pos < 0:
pos = 0
self.listbox.focus_position = pos
self.listbox.make_cursor_visible(size)
self._invalidate()
elif button == 5:
pos = self.listbox.focus_position + int(self.height * SCROLL_WHEEL_HEIGHT_RATIO)
if pos > len(self.listbox.body) - 1:
if self.infinite:
self.load_more = True
pos = len(self.listbox.body) - 1
self.listbox.focus_position = pos
self.listbox.make_cursor_visible(size)
self._invalidate()
elif event == 'mouse drag':
if self.drag_from is None:
return
if button == 1:
self.drag_to = (col, row)
if self.mouse_state == 1:
self.mouse_state = 2
urwid.signals.emit_signal(
self, "drag_start",self, self.drag_from
)
else:
urwid.signals.emit_signal(
self, "drag_continue",self,
self.drag_last, self.drag_to
)
self.drag_last = (col, row)
elif event == 'mouse release':
if self.mouse_state == 2:
self.drag_to = (col, row)
urwid.signals.emit_signal(
self, "drag_stop",self, self.drag_from, self.drag_to
)
self.mouse_state = 0
return super(ScrollingListBox, self).mouse_event(size, event, button, col, row, focus)
def keypress(self, size, key):
command = self._command_map[key]
if not command:
return super(ScrollingListBox, self).keypress(size, key)
# down, page down at end trigger load of more data
if (
command in ["cursor down", "cursor page down"]
and self.infinite
and (
not len(self.body)
or self.focus_position == len(self.body)-1)
):
self.load_more = True
self.queued_keypress = key
self._invalidate()
elif command == "activate":
urwid.signals.emit_signal(self, "select", self, self.selection)
# else:
return super(ScrollingListBox, self).keypress(size, key)
@property
def selection(self):
if len(self.body):
return self.body[self.focus_position]
def render(self, size, focus=False):
maxcol = size[0]
self.width = maxcol
if len(size) > 1:
maxrow = size[1]
self.height = maxrow
# print
# print
# print self.listbox.get_focus_offset_inset(size)
if (self.load_more
and (len(self.body) == 0
or "bottom" in self.ends_visible((maxcol, maxrow))
)
):
self.load_more = False
self.page += 1
# old_len = len(self.body)
try:
focus = self.focus_position
except IndexError:
focus = None
urwid.signals.emit_signal(
self, "load_more", focus)
if (self.queued_keypress
and focus
and focus < len(self.body)
):
# logger.info("send queued keypress")
self.keypress(size, self.queued_keypress)
self.queued_keypress = None
# self.listbox._invalidate()
# self._invalidate()
if self.with_scrollbar and len(self.body):
self.scroll_bar.update(size)
return super(ScrollingListBox, self).render(size, focus)
def disable(self):
self.selectable = lambda: False
def enable(self):
self.selectable = lambda: True
@property
def contents(self):
return self.columns.contents
@property
def focus(self):
return self.listbox.focus
@property
def focus_position(self):
if not len(self.listbox.body):
raise IndexError
if len(self.listbox.body):
return self.listbox.focus_position
return None
@focus_position.setter
def focus_position(self, value):
if not len(self.body):
return
self.listbox.focus_position = value
self.listbox._invalidate()
def __getattr__(self, attr):
if attr in ["ends_visible", "focus_position", "set_focus", "set_focus_valign", "body", "focus"]:
return getattr(self.listbox, attr)
# elif attr == "body":
# return self.walker
raise AttributeError(attr)
@property
def row_count(self):
if self.row_count_fn:
return self.row_count_fn()
return len(self.body)
__all__ = ["ScrollingListBox"]
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