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# Copyright (C) 2015 James E. Blair <corvus@gnu.org>
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
import urwid
class Transition(urwid.Widget):
def __init__(self, duration=0.4):
super(Transition, self).__init__()
self.duration = duration
self.old = None
self.new = None
self.progress = 0.0
def getDuration(self):
return self.duration
def setTargets(self, old, new):
self.old = old
self.new = new
self.setProgress(0.0)
def setProgress(self, progress):
self.progress = progress
self._invalidate()
class PanTransition(Transition):
def render(self, size, focus=False):
old = self.old.render((size[0], size[1]))
new = self.new.render((size[0], size[1]))
c = urwid.CanvasJoin([(old, None, False, size[0]),
(new, None, False, size[0])])
#c = urwid.CanvasOverlay(new, old, 6, 0)
offset = int(size[0] * self.progress)
c.pad_trim_left_right(0-offset, 0-(size[0]-offset))
return c
class TiltTransition(Transition):
def render(self, size, focus=False):
old = self.old.render((size[0], size[1]))
new = self.new.render((size[0], size[1]))
c = urwid.CanvasCombine([(old, None, False),
(new, None, False)])
offset = int(size[1] * self.progress)
c.pad_trim_top_bottom(0-offset, 0-(size[1]-offset))
return c
class DissolveTransition(Transition):
def __init__(self, *args, **kw):
super(DissolveTransition, self).__init__(*args, **kw)
self._oldbuf = None
self._newbuf = None
self._cache_size = None
def setTargets(self, old, new):
if old != self.old:
self._oldbuf = None
self._cache_size = None
if new != self.new:
self._newbuf = None
self._cache_size = None
super(DissolveTransition, self).setTargets(old, new)
def _to_buf(self, canvas):
buf = []
for line in canvas.content():
for (attr, cs, text) in line:
for char in unicode(text, 'utf8'):
buf.append((attr, cs, char))
return buf
def render(self, size, focus=False):
if self._cache_size != size:
old = self.old.render((size[0], size[1]))
new = self.new.render((size[0], size[1]))
self._oldbuf = self._to_buf(old)
self._newbuf = self._to_buf(new)
self._cache_size = size
line_list = []
attr_list = []
line_text = ''
line_attrs = []
current_attr = [None, 0]
current_rgb = None
current_props = None
background = urwid.AttrSpec('light gray', 'black')
for i in range(len(self._oldbuf)):
oldattr, oldcs, oldchar = self._oldbuf[i]
newattr, newcs, newchar = self._newbuf[i]
oldrgb = oldattr.get_rgb_values()
newrgb = newattr.get_rgb_values()
if None in oldrgb:
oldrgb = background.get_rgb_values()
if None in newrgb:
newrgb = background.get_rgb_values()
if newchar == ' ':
char = oldchar
charattr = oldattr
newrgb = newrgb[3:]*2
elif oldchar == ' ':
char = newchar
charattr = newattr
oldrgb = oldrgb[3:]*2
elif self.progress >= 0.5:
char = newchar
charattr = newattr
else:
char = oldchar
charattr = oldattr
char = char.encode('utf8')
line_text += char
rgb = []
props = []
if charattr.bold:
props.append('bold')
if charattr.underline:
props.append('underline')
if charattr.standout:
props.append('standout')
if charattr.blink:
props.append('blink')
for x in range(len(oldrgb)):
rgb.append(int(((newrgb[x]-oldrgb[x])*self.progress)+oldrgb[x])>>4)
if current_rgb == rgb and current_props == props:
current_attr[1] += len(char)
else:
if current_attr[0]:
line_attrs.append(tuple(current_attr))
fg = ', '.join(props + ['#%x%x%x' % tuple(rgb[:3])])
bg = '#%x%x%x' % tuple(rgb[3:])
attr = urwid.AttrSpec(fg, bg)
current_attr = [attr, len(char)]
current_rgb = rgb
current_props = props
if (i+1) % size[0] == 0:
line_attrs.append(tuple(current_attr))
current_attr = [None, 0]
current_rgb = None
line_list.append(line_text)
line_text = ''
attr_list.append(line_attrs)
line_attrs = []
canvas = urwid.TextCanvas(line_list, attr_list)
return canvas
class CutTransition(Transition):
def __init__(self, *args, **kw):
super(CutTransition, self).__init__(*args, **kw)
self.duration = 0.0
def render(self, size, focus=False):
return self.new.render(size, focus)
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