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canvas.py
#!/usr/bin/python # # Urwid canvas class and functions # Copyright (C) 2004-2011 Ian Ward # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # This library 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 # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # Urwid web site: http://excess.org/urwid/ from __future__ import division, print_function import weakref from urwid.util import rle_len, rle_append_modify, rle_join_modify, rle_product, \ calc_width, calc_text_pos, apply_target_encoding, trim_text_attr_cs from urwid.text_layout import trim_line, LayoutSegment from urwid.compat import bytes class CanvasCache(object): """ Cache for rendered canvases. Automatically populated and accessed by Widget render() MetaClass magic, cleared by Widget._invalidate(). Stores weakrefs to the canvas objects, so an external class must maintain a reference for this cache to be effective. At present the Screen classes store the last topmost canvas after redrawing the screen, keeping the canvases from being garbage collected. _widgets[widget] = {(wcls, size, focus): weakref.ref(canvas), ...} _refs[weakref.ref(canvas)] = (widget, wcls, size, focus) _deps[widget} = [dependent_widget, ...] """ _widgets = {} _refs = {} _deps = {} hits = 0 fetches = 0 cleanups = 0 def store(cls, wcls, canvas): """ Store a weakref to canvas in the cache. wcls -- widget class that contains render() function canvas -- rendered canvas with widget_info (widget, size, focus) """ if not canvas.cacheable: return assert canvas.widget_info, "Can't store canvas without widget_info" widget, size, focus = canvas.widget_info def walk_depends(canv): """ Collect all child widgets for determining who we depend on. """ # FIXME: is this recursion necessary? The cache # invalidating might work with only one level. depends = [] for x, y, c, pos in canv.children: if c.widget_info: depends.append(c.widget_info[0]) elif hasattr(c, 'children'): depends.extend(walk_depends(c)) return depends # use explicit depends_on if available from the canvas depends_on = getattr(canvas, 'depends_on', None) if depends_on is None and hasattr(canvas, 'children'): depends_on = walk_depends(canvas) if depends_on: for w in depends_on: if w not in cls._widgets: return for w in depends_on: cls._deps.setdefault(w,[]).append(widget) ref = weakref.ref(canvas, cls.cleanup) cls._refs[ref] = (widget, wcls, size, focus) cls._widgets.setdefault(widget, {})[(wcls, size, focus)] = ref store = classmethod(store) def fetch(cls, widget, wcls, size, focus): """ Return the cached canvas or None. widget -- widget object requested wcls -- widget class that contains render() function size, focus -- render() parameters """ cls.fetches += 1 # collect stats sizes = cls._widgets.get(widget, None) if not sizes: return None ref = sizes.get((wcls, size, focus), None) if not ref: return None canv = ref() if canv: cls.hits += 1 # more stats return canv fetch = classmethod(fetch) def invalidate(cls, widget): """ Remove all canvases cached for widget. """ try: for ref in cls._widgets[widget].values(): try: del cls._refs[ref] except KeyError: pass del cls._widgets[widget] except KeyError: pass if widget not in cls._deps: return dependants = cls._deps.get(widget, []) try: del cls._deps[widget] except KeyError: pass for w in dependants: cls.invalidate(w) invalidate = classmethod(invalidate) def cleanup(cls, ref): cls.cleanups += 1 # collect stats w = cls._refs.get(ref, None) del cls._refs[ref] if not w: return widget, wcls, size, focus = w sizes = cls._widgets.get(widget, None) if not sizes: return try: del sizes[(wcls, size, focus)] except KeyError: pass if not sizes: try: del cls._widgets[widget] del cls._deps[widget] except KeyError: pass cleanup = classmethod(cleanup) def clear(cls): """ Empty the cache. """ cls._widgets = {} cls._refs = {} cls._deps = {} clear = classmethod(clear) class CanvasError(Exception): pass class Canvas(object): """ base class for canvases """ cacheable = True _finalized_error = CanvasError("This canvas has been finalized. " "Use CompositeCanvas to wrap this canvas if " "you need to make changes.") _renamed_error = CanvasError("The old Canvas class is now called " "TextCanvas. Canvas is now the base class for all canvas " "classes.") _old_repr_error = CanvasError("The internal representation of " "canvases is no longer stored as .text, .attr, and .cs " "lists, please see the TextCanvas class for the new " "representation of canvas content.") def __init__(self, value1=None, value2=None, value3=None): """ value1, value2, value3 -- if not None, raise a helpful error: the old Canvas class is now called TextCanvas. """ if value1 is not None: raise self._renamed_error self._widget_info = None self.coords = {} self.shortcuts = {} def finalize(self, widget, size, focus): """ Mark this canvas as finalized (should not be any future changes to its content). This is required before caching the canvas. This happens automatically after a widget's 'render call returns the canvas thanks to some metaclass magic. widget -- widget that rendered this canvas size -- size parameter passed to widget's render method focus -- focus parameter passed to widget's render method """ if self.widget_info: raise self._finalized_error self._widget_info = widget, size, focus def _get_widget_info(self): return self._widget_info widget_info = property(_get_widget_info) def _raise_old_repr_error(self, val=None): raise self._old_repr_error def _text_content(self): """ Return the text content of the canvas as a list of strings, one for each row. """ return [bytes().join([text for (attr, cs, text) in row]) for row in self.content()] text = property(_text_content, _raise_old_repr_error) attr = property(_raise_old_repr_error, _raise_old_repr_error) cs = property(_raise_old_repr_error, _raise_old_repr_error) def content(self, trim_left=0, trim_top=0, cols=None, rows=None, attr=None): raise NotImplementedError() def cols(self): raise NotImplementedError() def rows(self): raise NotImplementedError() def content_delta(self): raise NotImplementedError() def get_cursor(self): c = self.coords.get("cursor", None) if not c: return return c[:2] # trim off data part def set_cursor(self, c): if self.widget_info and self.cacheable: raise self._finalized_error if c is None: try: del self.coords["cursor"] except KeyError: pass return self.coords["cursor"] = c + (None,) # data part cursor = property(get_cursor, set_cursor) def get_pop_up(self): c = self.coords.get("pop up", None) if not c: return return c def set_pop_up(self, w, left, top, overlay_width, overlay_height): """ This method adds pop-up information to the canvas. This information is intercepted by a PopUpTarget widget higher in the chain to display a pop-up at the given (left, top) position relative to the current canvas. :param w: widget to use for the pop-up :type w: widget :param left: x position for left edge of pop-up >= 0 :type left: int :param top: y position for top edge of pop-up >= 0 :type top: int :param overlay_width: width of overlay in screen columns > 0 :type overlay_width: int :param overlay_height: height of overlay in screen rows > 0 :type overlay_height: int """ if self.widget_info and self.cacheable: raise self._finalized_error self.coords["pop up"] = (left, top, ( w, overlay_width, overlay_height)) def translate_coords(self, dx, dy): """ Return coords shifted by (dx, dy). """ d = {} for name, (x, y, data) in self.coords.items(): d[name] = (x+dx, y+dy, data) return d class TextCanvas(Canvas): """ class for storing rendered text and attributes """ def __init__(self, text=None, attr=None, cs=None, cursor=None, maxcol=None, check_width=True): """ text -- list of strings, one for each line attr -- list of run length encoded attributes for text cs -- list of run length encoded character set for text cursor -- (x,y) of cursor or None maxcol -- screen columns taken by this canvas check_width -- check and fix width of all lines in text """ Canvas.__init__(self) if text == None: text = [] if check_width: widths = [] for t in text: if type(t) != bytes: raise CanvasError("Canvas text must be plain strings encoded in the screen's encoding", repr(text)) widths.append( calc_width( t, 0, len(t)) ) else: assert type(maxcol) == int widths = [maxcol] * len(text) if maxcol is None: if widths: # find maxcol ourselves maxcol = max(widths) else: maxcol = 0 if attr == None: attr = [[] for x in range(len(text))] if cs == None: cs = [[] for x in range(len(text))] # pad text and attr to maxcol for i in range(len(text)): w = widths[i] if w > maxcol: raise CanvasError("Canvas text is wider than the maxcol specified \n%r\n%r\n%r"%(maxcol,widths,text)) if w < maxcol: text[i] = text[i] + bytes().rjust(maxcol-w) a_gap = len(text[i]) - rle_len( attr[i] ) if a_gap < 0: raise CanvasError("Attribute extends beyond text \n%r\n%r" % (text[i],attr[i]) ) if a_gap: rle_append_modify( attr[i], (None, a_gap)) cs_gap = len(text[i]) - rle_len( cs[i] ) if cs_gap < 0: raise CanvasError("Character Set extends beyond text \n%r\n%r" % (text[i],cs[i]) ) if cs_gap: rle_append_modify( cs[i], (None, cs_gap)) self._attr = attr self._cs = cs self.cursor = cursor self._text = text self._maxcol = maxcol def rows(self): """Return the number of rows in this canvas.""" rows = len(self._text) assert isinstance(rows, int) return rows def cols(self): """Return the screen column width of this canvas.""" return self._maxcol def translated_coords(self,dx,dy): """ Return cursor coords shifted by (dx, dy), or None if there is no cursor. """ if self.cursor: x, y = self.cursor return x+dx, y+dy return None def content(self, trim_left=0, trim_top=0, cols=None, rows=None, attr_map=None): """ Return the canvas content as a list of rows where each row is a list of (attr, cs, text) tuples. trim_left, trim_top, cols, rows may be set by CompositeCanvas when rendering a partially obscured canvas. """ maxcol, maxrow = self.cols(), self.rows() if not cols: cols = maxcol - trim_left if not rows: rows = maxrow - trim_top assert trim_left >= 0 and trim_left < maxcol assert cols > 0 and trim_left + cols <= maxcol assert trim_top >=0 and trim_top < maxrow assert rows > 0 and trim_top + rows <= maxrow if trim_top or rows < maxrow: text_attr_cs = zip( self._text[trim_top:trim_top+rows], self._attr[trim_top:trim_top+rows], self._cs[trim_top:trim_top+rows]) else: text_attr_cs = zip(self._text, self._attr, self._cs) for text, a_row, cs_row in text_attr_cs: if trim_left or cols < self._maxcol: text, a_row, cs_row = trim_text_attr_cs( text, a_row, cs_row, trim_left, trim_left + cols) attr_cs = rle_product(a_row, cs_row) i = 0 row = [] for (a, cs), run in attr_cs: if attr_map and a in attr_map: a = attr_map[a] row.append((a, cs, text[i:i+run])) i += run yield row def content_delta(self, other): """ Return the differences between other and this canvas. If other is the same object as self this will return no differences, otherwise this is the same as calling content(). """ if other is self: return [self.cols()]*self.rows() return self.content() class BlankCanvas(Canvas): """ a canvas with nothing on it, only works as part of a composite canvas since it doesn't know its own size """ def __init__(self): Canvas.__init__(self, None) def content(self, trim_left, trim_top, cols, rows, attr): """ return (cols, rows) of spaces with default attributes. """ def_attr = None if attr and None in attr: def_attr = attr[None] line = [(def_attr, None, bytes().rjust(cols))] for i in range(rows): yield line def cols(self): raise NotImplementedError("BlankCanvas doesn't know its own size!") def rows(self): raise NotImplementedError("BlankCanvas doesn't know its own size!") def content_delta(self): raise NotImplementedError("BlankCanvas doesn't know its own size!") blank_canvas = BlankCanvas() class SolidCanvas(Canvas): """ A canvas filled completely with a single character. """ def __init__(self, fill_char, cols, rows): Canvas.__init__(self) end, col = calc_text_pos(fill_char, 0, len(fill_char), 1) assert col == 1, "Invalid fill_char: %r" % fill_char self._text, cs = apply_target_encoding(fill_char[:end]) self._cs = cs[0][0] self.size = cols, rows self.cursor = None def cols(self): return self.size[0] def rows(self): return self.size[1] def content(self, trim_left=0, trim_top=0, cols=None, rows=None, attr=None): if cols is None: cols = self.size[0] if rows is None: rows = self.size[1] def_attr = None if attr and None in attr: def_attr = attr[None] line = [(def_attr, self._cs, self._text*cols)] for i in range(rows): yield line def content_delta(self, other): """ Return the differences between other and this canvas. """ if other is self: return [self.cols()]*self.rows() return self.content() class CompositeCanvas(Canvas): """ class for storing a combination of canvases """ def __init__(self, canv=None): """ canv -- a Canvas object to wrap this CompositeCanvas around. if canv is a CompositeCanvas, make a copy of its contents """ # a "shard" is a (num_rows, list of cviews) tuple, one for # each cview starting in this shard # a "cview" is a tuple that defines a view of a canvas: # (trim_left, trim_top, cols, rows, attr_map, canv) # a "shard tail" is a list of tuples: # (col_gap, done_rows, content_iter, cview) # tuples that define the unfinished cviews that are part of # shards following the first shard. Canvas.__init__(self) if canv is None: self.shards = [] self.children = [] else: if hasattr(canv, "shards"): self.shards = canv.shards else: self.shards = [(canv.rows(), [ (0, 0, canv.cols(), canv.rows(), None, canv)])] self.children = [(0, 0, canv, None)] self.coords.update(canv.coords) for shortcut in canv.shortcuts: self.shortcuts[shortcut] = "wrap" def rows(self): for r,cv in self.shards: try: assert isinstance(r, int) except AssertionError: raise AssertionError(r, cv) rows = sum([r for r,cv in self.shards]) assert isinstance(rows, int) return rows def cols(self): if not self.shards: return 0 cols = sum([cv[2] for cv in self.shards[0][1]]) assert isinstance(cols, int) return cols def content(self): """ Return the canvas content as a list of rows where each row is a list of (attr, cs, text) tuples. """ shard_tail = [] for num_rows, cviews in self.shards: # combine shard and shard tail sbody = shard_body(cviews, shard_tail) # output rows for i in range(num_rows): yield shard_body_row(sbody) # prepare next shard tail shard_tail = shard_body_tail(num_rows, sbody) def content_delta(self, other): """ Return the differences between other and this canvas. """ if not hasattr(other, 'shards'): for row in self.content(): yield row return shard_tail = [] for num_rows, cviews in shards_delta( self.shards, other.shards): # combine shard and shard tail sbody = shard_body(cviews, shard_tail) # output rows row = [] for i in range(num_rows): # if whole shard is unchanged, don't keep # calling shard_body_row if len(row) != 1 or type(row[0]) != int: row = shard_body_row(sbody) yield row # prepare next shard tail shard_tail = shard_body_tail(num_rows, sbody) def trim(self, top, count=None): """Trim lines from the top and/or bottom of canvas. top -- number of lines to remove from top count -- number of lines to keep, or None for all the rest """ assert top >= 0, "invalid trim amount %d!"%top assert top < self.rows(), "cannot trim %d lines from %d!"%( top, self.rows()) if self.widget_info: raise self._finalized_error if top: self.shards = shards_trim_top(self.shards, top) if count == 0: self.shards = [] elif count is not None: self.shards = shards_trim_rows(self.shards, count) self.coords = self.translate_coords(0, -top) def trim_end(self, end): """Trim lines from the bottom of the canvas. end -- number of lines to remove from the end """ assert end > 0, "invalid trim amount %d!"%end assert end <= self.rows(), "cannot trim %d lines from %d!"%( end, self.rows()) if self.widget_info: raise self._finalized_error self.shards = shards_trim_rows(self.shards, self.rows() - end) def pad_trim_left_right(self, left, right): """ Pad or trim this canvas on the left and right values > 0 indicate screen columns to pad values < 0 indicate screen columns to trim """ if self.widget_info: raise self._finalized_error shards = self.shards if left < 0 or right < 0: trim_left = max(0, -left) cols = self.cols() - trim_left - max(0, -right) shards = shards_trim_sides(shards, trim_left, cols) rows = self.rows() if left > 0 or right > 0: top_rows, top_cviews = shards[0] if left > 0: new_top_cviews = ( [(0,0,left,rows,None,blank_canvas)] + top_cviews) else: new_top_cviews = top_cviews[:] #copy if right > 0: new_top_cviews.append( (0,0,right,rows,None,blank_canvas)) shards = [(top_rows, new_top_cviews)] + shards[1:] self.coords = self.translate_coords(left, 0) self.shards = shards def pad_trim_top_bottom(self, top, bottom): """ Pad or trim this canvas on the top and bottom. """ if self.widget_info: raise self._finalized_error orig_shards = self.shards if top < 0 or bottom < 0: trim_top = max(0, -top) rows = self.rows() - trim_top - max(0, -bottom) self.trim(trim_top, rows) cols = self.cols() if top > 0: self.shards = [(top, [(0,0,cols,top,None,blank_canvas)])] + \ self.shards self.coords = self.translate_coords(0, top) if bottom > 0: if orig_shards is self.shards: self.shards = self.shards[:] self.shards.append((bottom, [(0,0,cols,bottom,None,blank_canvas)])) def overlay(self, other, left, top ): """Overlay other onto this canvas.""" if self.widget_info: raise self._finalized_error width = other.cols() height = other.rows() right = self.cols() - left - width bottom = self.rows() - top - height assert right >= 0, "top canvas of overlay not the size expected!" + repr((other.cols(),left,right,width)) assert bottom >= 0, "top canvas of overlay not the size expected!" + repr((other.rows(),top,bottom,height)) shards = self.shards top_shards = [] side_shards = self.shards bottom_shards = [] if top: side_shards = shards_trim_top(shards, top) top_shards = shards_trim_rows(shards, top) if bottom: bottom_shards = shards_trim_top(side_shards, height) side_shards = shards_trim_rows(side_shards, height) left_shards = [] right_shards = [] if left > 0: left_shards = [shards_trim_sides(side_shards, 0, left)] if right > 0: right_shards = [shards_trim_sides(side_shards, max(0, left + width), right)] if not self.rows(): middle_shards = [] elif left or right: middle_shards = shards_join(left_shards + [other.shards] + right_shards) else: middle_shards = other.shards self.shards = top_shards + middle_shards + bottom_shards self.coords.update(other.translate_coords(left, top)) def fill_attr(self, a): """ Apply attribute a to all areas of this canvas with default attribute currently set to None, leaving other attributes intact.""" self.fill_attr_apply({None:a}) def fill_attr_apply(self, mapping): """ Apply an attribute-mapping dictionary to the canvas. mapping -- dictionary of original-attribute:new-attribute items """ if self.widget_info: raise self._finalized_error shards = [] for num_rows, original_cviews in self.shards: new_cviews = [] for cv in original_cviews: # cv[4] == attr_map if cv[4] is None: new_cviews.append(cv[:4] + (mapping,) + cv[5:]) else: combined = dict(mapping) combined.update([ (k, mapping.get(v, v)) for k,v in cv[4].items()]) new_cviews.append(cv[:4] + (combined,) + cv[5:]) shards.append((num_rows, new_cviews)) self.shards = shards def set_depends(self, widget_list): """ Explicitly specify the list of widgets that this canvas depends on. If any of these widgets change this canvas will have to be updated. """ if self.widget_info: raise self._finalized_error self.depends_on = widget_list def shard_body_row(sbody): """ Return one row, advancing the iterators in sbody. ** MODIFIES sbody by calling next() on its iterators ** """ row = [] for done_rows, content_iter, cview in sbody: if content_iter: row.extend(next(content_iter)) else: # need to skip this unchanged canvas if row and type(row[-1]) == int: row[-1] = row[-1] + cview[2] else: row.append(cview[2]) return row def shard_body_tail(num_rows, sbody): """ Return a new shard tail that follows this shard body. """ shard_tail = [] col_gap = 0 done_rows = 0 for done_rows, content_iter, cview in sbody: cols, rows = cview[2:4] done_rows += num_rows if done_rows == rows: col_gap += cols continue shard_tail.append((col_gap, done_rows, content_iter, cview)) col_gap = 0 return shard_tail def shards_delta(shards, other_shards): """ Yield shards1 with cviews that are the same as shards2 having canv = None. """ other_shards_iter = iter(other_shards) other_num_rows = other_cviews = None done = other_done = 0 for num_rows, cviews in shards: if other_num_rows is None: other_num_rows, other_cviews = next(other_shards_iter) while other_done < done: other_done += other_num_rows other_num_rows, other_cviews = next(other_shards_iter) if other_done > done: yield (num_rows, cviews) done += num_rows continue # top-aligned shards, compare each cview yield (num_rows, shard_cviews_delta(cviews, other_cviews)) other_done += other_num_rows other_num_rows = None done += num_rows def shard_cviews_delta(cviews, other_cviews): """ """ other_cviews_iter = iter(other_cviews) other_cv = None cols = other_cols = 0 for cv in cviews: if other_cv is None: other_cv = next(other_cviews_iter) while other_cols < cols: other_cols += other_cv[2] other_cv = next(other_cviews_iter) if other_cols > cols: yield cv cols += cv[2] continue # top-left-aligned cviews, compare them if cv[5] is other_cv[5] and cv[:5] == other_cv[:5]: yield cv[:5]+(None,)+cv[6:] else: yield cv other_cols += other_cv[2] other_cv = None cols += cv[2] def shard_body(cviews, shard_tail, create_iter=True, iter_default=None): """ Return a list of (done_rows, content_iter, cview) tuples for this shard and shard tail. If a canvas in cviews is None (eg. when unchanged from shard_cviews_delta()) or if create_iter is False then no iterator is created for content_iter. iter_default is the value used for content_iter when no iterator is created. """ col = 0 body = [] # build the next shard tail cviews_iter = iter(cviews) for col_gap, done_rows, content_iter, tail_cview in shard_tail: while col_gap: try: cview = next(cviews_iter) except StopIteration: break (trim_left, trim_top, cols, rows, attr_map, canv) = \ cview[:6] col += cols col_gap -= cols if col_gap < 0: raise CanvasError("cviews overflow gaps in" " shard_tail!") if create_iter and canv: new_iter = canv.content(trim_left, trim_top, cols, rows, attr_map) else: new_iter = iter_default body.append((0, new_iter, cview)) body.append((done_rows, content_iter, tail_cview)) for cview in cviews_iter: (trim_left, trim_top, cols, rows, attr_map, canv) = \ cview[:6] if create_iter and canv: new_iter = canv.content(trim_left, trim_top, cols, rows, attr_map) else: new_iter = iter_default body.append((0, new_iter, cview)) return body def shards_trim_top(shards, top): """ Return shards with top rows removed. """ assert top > 0 shard_iter = iter(shards) shard_tail = [] # skip over shards that are completely removed for num_rows, cviews in shard_iter: if top < num_rows: break sbody = shard_body(cviews, shard_tail, False) shard_tail = shard_body_tail(num_rows, sbody) top -= num_rows else: raise CanvasError("tried to trim shards out of existence") sbody = shard_body(cviews, shard_tail, False) shard_tail = shard_body_tail(num_rows, sbody) # trim the top of this shard new_sbody = [] for done_rows, content_iter, cv in sbody: new_sbody.append((0, content_iter, cview_trim_top(cv, done_rows+top))) sbody = new_sbody new_shards = [(num_rows-top, [cv for done_rows, content_iter, cv in sbody])] # write out the rest of the shards new_shards.extend(shard_iter) return new_shards def shards_trim_rows(shards, keep_rows): """ Return the topmost keep_rows rows from shards. """ assert keep_rows >= 0, keep_rows new_shards = [] done_rows = 0 for num_rows, cviews in shards: if done_rows >= keep_rows: break new_cviews = [] for cv in cviews: if cv[3] + done_rows > keep_rows: new_cviews.append(cview_trim_rows(cv, keep_rows - done_rows)) else: new_cviews.append(cv) if num_rows + done_rows > keep_rows: new_shards.append((keep_rows - done_rows, new_cviews)) else: new_shards.append((num_rows, new_cviews)) done_rows += num_rows return new_shards def shards_trim_sides(shards, left, cols): """ Return shards with starting from column left and cols total width. """ assert left >= 0 and cols > 0, (left, cols) shard_tail = [] new_shards = [] right = left + cols for num_rows, cviews in shards: sbody = shard_body(cviews, shard_tail, False) shard_tail = shard_body_tail(num_rows, sbody) new_cviews = [] col = 0 for done_rows, content_iter, cv in sbody: cv_cols = cv[2] next_col = col + cv_cols if done_rows or next_col <= left or col >= right: col = next_col continue if col < left: cv = cview_trim_left(cv, left - col) col = left if next_col > right: cv = cview_trim_cols(cv, right - col) new_cviews.append(cv) col = next_col if not new_cviews: prev_num_rows, prev_cviews = new_shards[-1] new_shards[-1] = (prev_num_rows+num_rows, prev_cviews) else: new_shards.append((num_rows, new_cviews)) return new_shards def shards_join(shard_lists): """ Return the result of joining shard lists horizontally. All shards lists must have the same number of rows. """ shards_iters = [iter(sl) for sl in shard_lists] shards_current = [next(i) for i in shards_iters] new_shards = [] while True: new_cviews = [] num_rows = min([r for r,cv in shards_current]) shards_next = [] for rows, cviews in shards_current: if cviews: new_cviews.extend(cviews) shards_next.append((rows - num_rows, None)) shards_current = shards_next new_shards.append((num_rows, new_cviews)) # advance to next shards try: for i in range(len(shards_current)): if shards_current[i][0] > 0: continue shards_current[i] = next(shards_iters[i]) except StopIteration: break return new_shards def cview_trim_rows(cv, rows): return cv[:3] + (rows,) + cv[4:] def cview_trim_top(cv, trim): return (cv[0], trim + cv[1], cv[2], cv[3] - trim) + cv[4:] def cview_trim_left(cv, trim): return (cv[0] + trim, cv[1], cv[2] - trim,) + cv[3:] def cview_trim_cols(cv, cols): return cv[:2] + (cols,) + cv[3:] def CanvasCombine(l): """Stack canvases in l vertically and return resulting canvas. :param l: list of (canvas, position, focus) tuples: position a value that widget.set_focus will accept or None if not allowed focus True if this canvas is the one that would be in focus if the whole widget is in focus """ clist = [(CompositeCanvas(c),p,f) for c,p,f in l] combined_canvas = CompositeCanvas() shards = [] children = [] row = 0 focus_index = 0 n = 0 for canv, pos, focus in clist: if focus: focus_index = n children.append((0, row, canv, pos)) shards.extend(canv.shards) combined_canvas.coords.update(canv.translate_coords(0, row)) for shortcut in canv.shortcuts.keys(): combined_canvas.shortcuts[shortcut] = pos row += canv.rows() n += 1 if focus_index: children = [children[focus_index]] + children[:focus_index] + \ children[focus_index+1:] combined_canvas.shards = shards combined_canvas.children = children return combined_canvas def CanvasOverlay(top_c, bottom_c, left, top): """ Overlay canvas top_c onto bottom_c at position (left, top). """ overlayed_canvas = CompositeCanvas(bottom_c) overlayed_canvas.overlay(top_c, left, top) overlayed_canvas.children = [(left, top, top_c, None), (0, 0, bottom_c, None)] overlayed_canvas.shortcuts = {} # disable background shortcuts for shortcut in top_c.shortcuts.keys(): overlayed_canvas.shortcuts[shortcut]="fg" return overlayed_canvas def CanvasJoin(l): """ Join canvases in l horizontally. Return result. :param l: list of (canvas, position, focus, cols) tuples: position value that widget.set_focus will accept or None if not allowed focus True if this canvas is the one that would be in focus if the whole widget is in focus cols is the number of screen columns that this widget will require, if larger than the actual canvas.cols() value then this widget will be padded on the right. """ l2 = [] focus_item = 0 maxrow = 0 n = 0 for canv, pos, focus, cols in l: rows = canv.rows() pad_right = cols - canv.cols() if focus: focus_item = n if rows > maxrow: maxrow = rows l2.append((canv, pos, pad_right, rows)) n += 1 shard_lists = [] children = [] joined_canvas = CompositeCanvas() col = 0 for canv, pos, pad_right, rows in l2: canv = CompositeCanvas(canv) if pad_right: canv.pad_trim_left_right(0, pad_right) if rows < maxrow: canv.pad_trim_top_bottom(0, maxrow - rows) joined_canvas.coords.update(canv.translate_coords(col, 0)) for shortcut in canv.shortcuts.keys(): joined_canvas.shortcuts[shortcut] = pos shard_lists.append(canv.shards) children.append((col, 0, canv, pos)) col += canv.cols() if focus_item: children = [children[focus_item]] + children[:focus_item] + \ children[focus_item+1:] joined_canvas.shards = shards_join(shard_lists) joined_canvas.children = children return joined_canvas def apply_text_layout(text, attr, ls, maxcol): t = [] a = [] c = [] class AttrWalk: pass aw = AttrWalk aw.k = 0 # counter for moving through elements of a aw.off = 0 # current offset into text of attr[ak] def arange( start_offs, end_offs ): """Return an attribute list for the range of text specified.""" if start_offs < aw.off: aw.k = 0 aw.off = 0 o = [] # the loop should run at least once, the '=' part ensures that while aw.off <= end_offs: if len(attr)<=aw.k: # run out of attributes o.append((None,end_offs-max(start_offs,aw.off))) break at,run = attr[aw.k] if aw.off+run <= start_offs: # move forward through attr to find start_offs aw.k += 1 aw.off += run continue if end_offs <= aw.off+run: o.append((at, end_offs-max(start_offs,aw.off))) break o.append((at, aw.off+run-max(start_offs, aw.off))) aw.k += 1 aw.off += run return o for line_layout in ls: # trim the line to fit within maxcol line_layout = trim_line( line_layout, text, 0, maxcol ) line = [] linea = [] linec = [] def attrrange( start_offs, end_offs, destw ): """ Add attributes based on attributes between start_offs and end_offs. """ if start_offs == end_offs: [(at,run)] = arange(start_offs,end_offs) rle_append_modify( linea, ( at, destw )) return if destw == end_offs-start_offs: for at, run in arange(start_offs,end_offs): rle_append_modify( linea, ( at, run )) return # encoded version has different width o = start_offs for at, run in arange(start_offs, end_offs): if o+run == end_offs: rle_append_modify( linea, ( at, destw )) return tseg = text[o:o+run] tseg, cs = apply_target_encoding( tseg ) segw = rle_len(cs) rle_append_modify( linea, ( at, segw )) o += run destw -= segw for seg in line_layout: #if seg is None: assert 0, ls s = LayoutSegment(seg) if s.end: tseg, cs = apply_target_encoding( text[s.offs:s.end]) line.append(tseg) attrrange(s.offs, s.end, rle_len(cs)) rle_join_modify( linec, cs ) elif s.text: tseg, cs = apply_target_encoding( s.text ) line.append(tseg) attrrange( s.offs, s.offs, len(tseg) ) rle_join_modify( linec, cs ) elif s.offs: if s.sc: line.append(bytes().rjust(s.sc)) attrrange( s.offs, s.offs, s.sc ) else: line.append(bytes().rjust(s.sc)) linea.append((None, s.sc)) linec.append((None, s.sc)) t.append(bytes().join(line)) a.append(linea) c.append(linec) return TextCanvas(t, a, c, maxcol=maxcol)
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