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helper.py
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helper.py
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from .font import big as big_font, big_only_caps as big_caps
class FlowText:
def __init__(self, w, h, notify=None, words=False, align=-1, big=False):
assert w >= 0 and h >= 0
self.w = w
self.h = h
self.notify = notify
self.words = words
self.align = align
self.font = 2 if big=='caps' else 1 if big else 0
self.prints = [ ]
self.enter = True
self.lines = [ ]
self.scroll = -1
self.flow = (0, 0)
def resize(self, w, h):
assert w >= 0 and h >= 0
if w == self.w and h == self.h: return
self.h = h
if w != self.w:
self.w = w
self.reflow(True)
else:
if self.notify: self.notify(self)
def word_wrap(self, words=None):
if words is None:
self.words = not self.words
self.reflow(True)
elif words != self.words:
self.words = words
self.reflow(True)
def left(self):
if self.align == -1: return
self.align = -1
if self.notify: self.notify(self)
def center(self):
if self.align == 0: return
self.align = 0
if self.notify: self.notify(self)
def right(self):
if self.align == 1: return
self.align = 1
if self.notify: self.notify(self)
def top(self):
if self.scroll == 0: return
self.scroll = 0
if self.notify: self.notify(self)
def bottom(self):
if self.scroll < 0: return
self.scroll = -1
if self.notify: self.notify(self)
def up(self, lines=1):
assert lines > 0
if self.scroll == 0: return
diff = len(self.lines) - self.h
if diff > 0:
self.scroll -= lines
if self.scroll > diff:
self.scroll = diff
elif self.scroll < 0:
self.scroll = 0
else:
self.scroll = 0
if self.notify: self.notify(self)
def down(self, lines=1):
assert lines > 0
if self.scroll < 0: return
diff = len(self.lines) - self.h
if diff > 0:
self.scroll += lines
if self.scroll > diff:
self.scroll = diff
else:
self.scroll = -1
if self.notify: self.notify(self)
def big(self, big=True):
font = 2 if big=='caps' else 1 if big else 0
if self.font == font: return
self.font = font
def print(self, txt='', enter=True):
if not isinstance(txt, str):
txt = f'{txt}'
prints = [ ]
while '\n' in txt:
idx = txt.index('\n')
prints.append(txt[:idx])
txt = txt[idx+1:]
prints.append(txt)
if self.font:
fprints = [ ]
if self.font == 1:
font = big_font
elif self.font == 2:
font = big_caps
else:
raise NotImplementedError(f'font type {self.font}')
h = len(font.matrix)
for line in prints:
fprints.extend([ '' for y in font.matrix ])
for c in line:
if c in font.chars:
if fprints[-1]:
for y in range(h):
fprints[-(h-y)] += ' '
x, w = font.chars[c]
for y, row in enumerate(font.matrix):
fprints[-(h-y)] += row[x:x+w]
else:
for y in range(h-1):
fprints[-(h-y)] += ' '
fprints[-1] += c
prints = fprints
if self.enter:
self.prints.extend(prints)
else:
self.prints[-1] += prints[0]
self.prints.extend(prints[1:])
self.enter = enter
self.reflow()
def reflow(self, reset=False):
if reset:
self.flow = (0, 0)
if self.w < 1 or self.h < 1:
return
if self.flow[0] and self.flow[1]:
self.lines = self.lines[:self.flow[1]]
elif self.lines:
self.lines = [ ]
for entry in self.prints[self.flow[0]:]:
while len(entry) > self.w:
chunk = entry[:self.w]
if self.words and entry[self.w] != ' ' and chunk[-1] != ' ' \
and ' ' in chunk:
idx = chunk.rindex(' ')
chunk = entry[:idx]
entry = entry[idx+1:]
else:
entry = entry[self.w:]
self.lines.append(chunk)
self.lines.append(entry)
if self.enter:
self.flow = (len(self.prints), len(self.lines))
else:
self.flow = (len(self.prints) - 1, len(self.lines) - 1)
if self.notify:
self.notify(self)
def view(self):
if self.w < 1 or self.h < 1:
return None
if self.scroll < 0:
showing = self.lines[-self.h:]
else:
showing = self.lines[self.scroll:self.scroll+self.h]
while len(showing) < self.h:
showing.append('')
if self.align < 0: # left
return [ line + ' ' * (self.w - len(line)) for line in showing ]
elif self.align > 0: # right
return [ ' ' * (self.w - len(line)) + line for line in showing ]
else: # center
view = [ ]
lpad = True
for line in showing:
diff = self.w - len(line)
if diff:
left = ' ' * (diff // 2)
right = left
if diff % 2:
if lpad: left += ' '
else: right += ' '
lpad = not lpad
view.append(left + line + right)
else:
view.append(line)
return view

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