Dome/Display2.py

   1 from __future__ import generators
   2
   3 import rox
   4 from rox import g
   5 from xml.dom import Node
   6 import pango
   7 from constants import XMLNS_NAMESPACE
   8
   9 import __main__
  10 default_font = __main__.default_font
  11
  12 drag_cursor = g.gdk.Cursor(g.gdk.HAND1)
  13
  14 def calc_node(display, node, pos):
  15         attribs = []
  16         if node.nodeType == Node.TEXT_NODE:
  17                 text = node.nodeValue.strip()
  18         elif node.nodeType == Node.ELEMENT_NODE:
  19                 if node.namespaceURI:
  20                         text = display.view.model.namespaces.prefix.get(node.namespaceURI, 'ERROR') + \
  21                                 ':' + node.localName
  22                 else:
  23                         text = node.localName
  24         elif node.nodeType == Node.ATTRIBUTE_NODE:
  25                 if node.namespaceURI:
  26                         text = display.view.model.namespaces.prefix.get(node.namespaceURI, 'ERROR') + \
  27                                 ':' + node.localName
  28                 else:
  29                         text = node.localName
  30                 text = ' %s=%s' % (unicode(text), unicode(node.value))
  31         elif node.nodeType == Node.COMMENT_NODE:
  32                 text = node.nodeValue.strip()
  33         elif node.nodeType == Node.DOCUMENT_NODE:
  34                 chroots = len(display.view.chroots)
  35                 if chroots > 1:
  36                         text = "subtree (%d levels)" % chroots
  37                 elif chroots == 1:
  38                         text = 'subtree (one level)'
  39                 else:
  40                         text = display.view.model.uri
  41         elif node.nodeName:
  42                 text = node.nodeName
  43         elif node.nodeValue:
  44                 text = '<noname>' + node.nodeValue
  45         else:
  46                 text = '<unknown>'
  47
  48         # PyGtk leaks PangoLayouts, so just reuse a single one
  49         layout = display.surface_layout
  50         layout.set_text(text)
  51         width, height = layout.get_pixel_size()
  52         x, y = map(int, pos)
  53
  54         text_x = x
  55         if node.nodeType != Node.ATTRIBUTE_NODE:
  56                 text_x += 12
  57
  58         def draw_fn():
  59                 surface = display.pm
  60                 style = display.surface.style   # Different surface ;-)
  61                 fg = style.fg_gc
  62                 bg = style.bg_gc
  63
  64                 if node in display.selection:
  65                         state = g.STATE_SELECTED
  66                 else:
  67                         state = g.STATE_NORMAL
  68
  69                 if node.nodeType != Node.ATTRIBUTE_NODE:
  70                         if node.nodeType == Node.ELEMENT_NODE:
  71                                 surface.draw_rectangle(style.fg_gc[state], False, x, y, 7, height - 2)
  72                                 surface.draw_rectangle(style.bg_gc[state], True, x + 1, y + 1, 6, height - 3)
  73                         elif node.nodeType == Node.DOCUMENT_NODE:
  74                                 surface.draw_arc(style.fg_gc[state], False, x, y, 7, height - 2, 0, 64 * 360)
  75                         else:
  76                                 # Text, etc
  77                                 surface.draw_rectangle(style.text_gc[state], False, x, y, 7, height - 2)
  78                                 surface.draw_rectangle(style.base_gc[state], True, x + 1, y + 1, 6, height - 3)
  79
  80                         if node in display.view.model.hidden:
  81                                 surface.draw_layout(fg[g.STATE_PRELIGHT], text_x + width + 2, y,
  82                                         display.create_pango_layout('(%s)' % display.view.model.hidden[node]))
  83
  84                 if node in display.selection:
  85                         surface.draw_rectangle(bg[g.STATE_SELECTED], True,
  86                                 text_x, y, width - 1, height - 1)
  87                         surface.draw_layout(fg[g.STATE_SELECTED], text_x, y, layout)
  88                 else:
  89                         if node.nodeType == Node.TEXT_NODE:
  90                                 gc = style.text_gc[g.STATE_NORMAL]
  91                         elif node.nodeType == Node.ATTRIBUTE_NODE:
  92                                 gc = style.fg_gc[g.STATE_INSENSITIVE]
  93                         elif node.nodeType == Node.COMMENT_NODE:
  94                                 gc = style.text_gc[g.STATE_INSENSITIVE]
  95                         else:
  96                                 gc = style.fg_gc[g.STATE_NORMAL]
  97                         surface.draw_layout(gc, text_x, y, layout)
  98
  99                 if node in display.view.marked:
 100                         surface.draw_rectangle(style.text_gc[g.STATE_PRELIGHT], False,
 101                                         x - 1, y - 1, width + (text_x - x), height)
 102
 103         bbox = (x, y, text_x + width, y + height)
 104         return bbox, draw_fn
 105
 106 class Display(g.HBox):
 107         visible = 1             # Always visible
 108
 109         def __init__(self, window, view):
 110                 g.HBox.__init__(self, False, 0)
 111
 112                 self.surface = g.EventBox()
 113                 self.surface_layout = self.surface.create_pango_layout('')
 114                 self.pack_start(self.surface, True, True, 0)
 115                 self.surface.show()
 116                 self.surface.set_app_paintable(True)
 117                 self.surface.set_double_buffered(False)
 118                 self.update_timeout = 0
 119                 self.cached_nodes = None
 120
 121                 self.scroll_adj = g.Adjustment(lower = 0, upper = 100, step_incr = 1)
 122                 self.scroll_adj.connect('value-changed', self.scroll_to)
 123                 scale = g.VScrollbar(self.scroll_adj)
 124                 scale.unset_flags(g.CAN_FOCUS)
 125                 #scale.set_draw_value(False)
 126                 self.pack_start(scale, False, True, 0)
 127
 128                 self.view = None
 129                 self.parent_window = window
 130                 self.pm = None
 131
 132                 s = self.surface.get_style().copy()
 133                 s.bg[g.STATE_NORMAL] = g.gdk.color_parse('old lace')
 134                 s.text[g.STATE_NORMAL] = g.gdk.color_parse('blue')
 135                 s.text[g.STATE_PRELIGHT] = g.gdk.color_parse('orange')  # Mark
 136                 s.text[g.STATE_INSENSITIVE] = g.gdk.color_parse('dark green')# Comment
 137                 s.fg[g.STATE_PRELIGHT] = g.gdk.color_parse('red')       # Hidden
 138                 self.surface.set_style(s)
 139
 140                 self.signals = [self.connect('destroy', self.destroyed)]
 141                 self.surface.connect('button-press-event', self.bg_event)
 142                 self.surface.connect('motion-notify-event', self.bg_motion)
 143                 self.surface.connect('button-release-event', self.bg_event)
 144
 145                 # Display is relative to this node, which is the highest
 146                 # displayed node (possibly off the top of the screen)
 147                 self.ref_node = view.root
 148                 self.ref_pos = (0, 0)
 149
 150                 self.drag_info = None
 151
 152                 self.last_alloc = None
 153                 self.surface.connect('size-allocate', lambda w, a: self.size_allocate(a))
 154                 self.surface.connect('size-request', lambda w, r: self.size_request(r))
 155                 self.surface.connect('expose-event', lambda w, e: 1)
 156
 157                 self.pan_timeout = None
 158                 self.h_limits = (0, 0)
 159                 self.set_view(view)
 160
 161         def destroyed(self, widget):
 162                 self.view.remove_display(self)
 163                 for s in self.signals:
 164                         self.disconnect(s)
 165                 if self.update_timeout:
 166                         g.timeout_remove(self.update_timeout)
 167                         self.update_timeout = 0
 168
 169                 #del self.selection
 170                 del self.view
 171                 del self.parent_window
 172                 del self.ref_node
 173                 del self.surface_layout
 174                 del self.surface
 175                 del self.scroll_adj
 176                 del self.drawn
 177                 del self.pm
 178
 179         def size_allocate(self, alloc):
 180                 new = (alloc.width, alloc.height)
 181                 if self.last_alloc == new:
 182                         return
 183                 self.last_alloc = new
 184                 assert self.window
 185                 #print "Alloc", alloc.width, alloc.height
 186                 pm = g.gdk.Pixmap(self.surface.window, alloc.width, alloc.height, -1)
 187                 self.surface.window.set_back_pixmap(pm, False)
 188                 self.pm = pm
 189
 190                 if self.update_timeout:
 191                         g.timeout_remove(self.update_timeout)
 192                         self.update_timeout = 0
 193                 self.update()
 194
 195         def update(self):
 196                 # Must be called either:
 197                 # - With no update_timeout running, or
 198                 # - From the timeout callback
 199
 200                 self.update_timeout = 0
 201
 202                 if not self.pm: return 0
 203                 #print "update"
 204
 205                 self.pm.draw_rectangle(self.surface.style.bg_gc[g.STATE_NORMAL], True,
 206                                   0, 0, self.last_alloc[0], self.last_alloc[1])
 207
 208                 self.drawn = {} # xmlNode -> ((x1, y1, y2, y2), attrib_parent)
 209
 210                 n = self.ref_node
 211                 p = self.view.root.parentNode
 212                 while n is not p:
 213                         n = n.parentNode
 214                         if not n:
 215                                 print "(lost root)"
 216                                 self.ref_node = self.view.root
 217                                 self.ref_pos = (0, 0)
 218                                 break
 219
 220                 if self.view.current_attrib:
 221                         self.selection = {self.view.current_attrib: None}
 222                 else:
 223                         self.selection = {}
 224                         for n in self.view.current_nodes:
 225                                 self.selection[n] = None
 226
 227                 pos = list(self.ref_pos)
 228                 self.h_limits = (self.ref_pos[0], self.ref_pos[0])      # Left, Right
 229                 node = self.ref_node
 230                 attr_parent = None
 231                 drawn = 0
 232                 for node, bbox, draw_fn in self.walk_tree(self.ref_node, self.ref_pos):
 233                         if bbox[1] > self.last_alloc[1]: break  # Off-screen
 234                         if bbox[1] > -self.last_alloc[1]:
 235                                 draw_fn()
 236                                 drawn += 1
 237                         else:
 238                                 pass#print 'Warning: Ref node way off:', bbox[1]
 239                         if node.nodeType == Node.ATTRIBUTE_NODE:
 240                                 self.drawn[node] = (bbox, attr_parent)
 241                         else:
 242                                 attr_parent = node
 243                                 self.drawn[node] = (bbox, None)
 244
 245                         if bbox[1] < 0 and node.nodeType != Node.ATTRIBUTE_NODE:
 246                                 self.ref_node = node
 247                                 self.ref_pos = bbox[:2]
 248                         self.h_limits = (min(self.h_limits[0], bbox[0]),
 249                                          max(self.h_limits[1], bbox[2]))
 250                 else:
 251                         # Didn't have enough nodes to fill the screen
 252                         frac_filled = float(bbox[3]) / self.last_alloc[1]
 253                         if frac_filled:
 254                                 drawn /= frac_filled
 255
 256                 self.surface.window.clear()
 257
 258                 # Update adjustment
 259                 self.ensure_cache()
 260                 try:
 261                         pos = self.cached_nodes.index(self.ref_node)
 262                 except:
 263                         pos = 0
 264                         print "Missing ref node!!"
 265                 self.scroll_adj.value = float(pos)
 266                 self.scroll_adj.upper = float(len(self.cached_nodes) + drawn)
 267
 268                 self.scroll_adj.page_size = float(drawn)
 269                 self.scroll_adj.page_increment = float(drawn)
 270
 271                 return 0
 272
 273         def ensure_cache(self):
 274                 "Find all the nodes in the document, in document order. Not attributes."
 275                 if self.cached_nodes is not None:
 276                         return
 277                 nodes = [self.view.root.parentNode]
 278                 node = self.view.root
 279                 while node:
 280                         nodes.append(node)
 281                         if node.childNodes:
 282                                 node = node.childNodes[0]
 283                         else:
 284                                 while not node.nextSibling:
 285                                         node = node.parentNode
 286                                         if not node:
 287                                                 self.cached_nodes = nodes
 288                                                 return
 289                                 node = node.nextSibling
 290                 self.cached_nodes = nodes
 291
 292         def walk_tree(self, node, pos):
 293                 """Yield this (node, bbox), and all following ones in document order."""
 294                 pos = list(pos)
 295                 hidden = self.view.model.hidden
 296                 while node:
 297                         bbox, draw_fn = calc_node(self, node, pos)
 298                         yield (node, bbox, draw_fn)
 299
 300                         if node.nodeType == Node.ELEMENT_NODE:
 301                                 if node not in hidden:
 302                                         apos = [bbox[2] + 4, bbox[1]]
 303                                         for key in node.attributes:
 304                                                 a = node.attributes[key]
 305                                                 if a.namespaceURI == XMLNS_NAMESPACE:
 306                                                         continue
 307                                                 abbox, draw_fn = calc_node(self, a, apos)
 308                                                 apos[0] = abbox[2] + 4
 309                                                 yield (a, abbox, draw_fn)
 310
 311                         pos[1] = bbox[3] + 2
 312                         if node.childNodes and node not in hidden:
 313                                 node = node.childNodes[0]
 314                                 pos[0] += 16
 315                         else:
 316                                 while not node.nextSibling:
 317                                         node = node.parentNode
 318                                         if not node: return
 319                                         pos[0] -= 16
 320                                 node = node.nextSibling
 321
 322         def size_request(self, req):
 323                 req.width = 4
 324                 req.height = 4
 325
 326         def do_update_now(self):
 327                 # Update now, if we need to
 328                 if self.update_timeout:
 329                         g.timeout_remove(self.update_timeout)
 330                         self.update_timeout = 0
 331                         self.update()
 332
 333         def update_all(self, node = None):
 334                 self.cached_nodes = None
 335
 336                 if self.update_timeout:
 337                         return          # Going to update anyway...
 338
 339                 if self.view.running():
 340                         self.update_timeout = g.timeout_add(2000, self.update)
 341                 else:
 342                         self.update_timeout = g.timeout_add(10, self.update)
 343
 344         def move_from(self, old = []):
 345                 if not self.pm: return
 346                 if self.view.current_nodes:
 347                         selection = {}
 348                         for n in self.view.current_nodes:
 349                                 selection[n] = None
 350                         shown = False
 351                         for node, bbox, draw_fn in self.walk_tree(self.ref_node, self.ref_pos):
 352                                 if bbox[1] > self.last_alloc[1]: break  # Off-screen
 353                                 if bbox[3] > 0 and node in selection:
 354                                         shown = True
 355                                         break   # A selected node is shown
 356                         if not shown:
 357                                 #print "(selected nodes not shown)"
 358                                 self.ref_node = self.view.current_nodes[0]
 359                                 self.ref_pos = (40, self.last_alloc[1] / 2)
 360                                 self.backup_ref_node()
 361                 self.update_all()
 362
 363         def set_view(self, view):
 364                 if self.view:
 365                         self.view.remove_display(self)
 366                 self.view = view
 367                 self.view.add_display(self)
 368                 self.update_all()
 369
 370         def show_menu(self, bev):
 371                 pass
 372
 373         def node_clicked(self, node, event):
 374                 pass
 375
 376         def xy_to_node(self, x, y):
 377                 "Return the node at this point and, if it's an attribute, its parent."
 378                 for (n, ((x1, y1, x2, y2), attrib_parent)) in self.drawn.iteritems():
 379                         if x >= x1 and x <= x2 and y >= y1 and y <= y2:
 380                                 return n, attrib_parent
 381                 return None, None
 382
 383         def pan(self):
 384                 def scale(x):
 385                         val = (float(abs(x)) ** 1.4)
 386                         if x < 0:
 387                                 return -val
 388                         else:
 389                                 return val
 390                 def chop(x):
 391                         if x > 10: return x - 10
 392                         if x < -10: return x + 10
 393                         return 0
 394                 x, y, mask = self.surface.window.get_pointer()
 395                 sx, sy = self.pan_start
 396                 dx, dy = scale(chop(x - sx)) / 20, scale(chop(y - sy))
 397                 dx = max(dx, 10 - self.h_limits[1])
 398                 dx = min(dx, self.last_alloc[0] - 10 - self.h_limits[0])
 399                 new = [self.ref_pos[0] + dx, self.ref_pos[1] + dy]
 400
 401                 if new == self.ref_pos:
 402                         return 1
 403
 404                 self.ref_pos = new
 405
 406                 self.backup_ref_node()
 407
 408                 if self.update_timeout:
 409                         g.timeout_remove(self.update_timeout)
 410                         self.update_timeout = 0
 411                 self.update()
 412
 413                 return 1
 414
 415         def backup_ref_node(self):
 416                 self.ref_pos = list(self.ref_pos)
 417                 # Walk up the parents until we get a ref node above the start of the screen
 418                 # (redraw will come back down)
 419                 while self.ref_pos[1] > 0:
 420                         src = self.ref_node
 421
 422                         if self.ref_node.previousSibling:
 423                                 self.ref_node = self.ref_node.previousSibling
 424                         elif self.ref_node.parentNode:
 425                                 self.ref_node = self.ref_node.parentNode
 426                         else:
 427                                 break
 428
 429                         # Walk from the parent node to find how far it is to this node...
 430                         for node, bbox, draw_fn in self.walk_tree(self.ref_node, (0, 0)):
 431                                 if node is src: break
 432                         else:
 433                                 assert 0
 434
 435                         self.ref_pos[0] -= bbox[0]
 436                         self.ref_pos[1] -= bbox[1]
 437
 438                         #print "(start from %s at (%d,%d))" % (self.ref_node, self.ref_pos[0], self.ref_pos[1])
 439
 440                 if self.ref_pos[1] > 10:
 441                         self.ref_pos[1] = 10
 442                 elif self.ref_pos[1] < -100:
 443                         for node, bbox, draw_fn in self.walk_tree(self.ref_node, self.ref_pos):
 444                                 if bbox[3] > 10: break  # Something is visible
 445                         else:
 446                                 self.ref_pos[1] = -100
 447
 448         def bg_motion(self, widget, event):
 449                 if not self.drag_info:
 450                         return
 451                 node, attr_parent, x, y, in_progress = self.drag_info
 452                 if not in_progress:
 453                         if abs(event.x - x) > 5 or abs(event.y - y) > 5:
 454                                 self.drag_info = (node, attr_parent, event.x, event.y, True)
 455                                 self.window.set_cursor(drag_cursor)
 456                         else:
 457                                 return False
 458                 return False
 459
 460         def do_drag(self, src, dst):
 461                 pass
 462
 463         def bg_event(self, widget, event):
 464                 if event.type == g.gdk.BUTTON_PRESS and event.button == 3:
 465                         self.show_menu(event)
 466                 elif event.type == g.gdk.BUTTON_PRESS or event.type == g.gdk._2BUTTON_PRESS:
 467                         self.do_update_now()
 468                         node, attr_parent = self.xy_to_node(event.x, event.y)
 469                         if event.button == 1:
 470                                 self.drag_info = (node, attr_parent, event.x, event.y, False)
 471                                 if node:
 472                                         if attr_parent:
 473                                                 self.attrib_clicked(attr_parent, node, event)
 474                                         else:
 475                                                 self.node_clicked(node, event)
 476                         elif event.button == 2:
 477                                 assert self.pan_timeout is None
 478                                 self.pan_start = (event.x, event.y)
 479                                 self.pan_timeout = g.timeout_add(100, self.pan)
 480                 elif event.type == g.gdk.BUTTON_RELEASE:
 481                         if event.button == 2:
 482                                 assert self.pan_timeout is not None
 483                                 g.timeout_remove(self.pan_timeout)
 484                                 self.pan_timeout = None
 485                         elif event.button == 1 and self.drag_info:
 486                                 src_node, src_attr_parent, x, y, in_progress = self.drag_info
 487                                 if not in_progress:
 488                                         return True
 489                                 dst_node, dst_attr_parent = self.xy_to_node(event.x, event.y)
 490                                 self.window.set_cursor(None)
 491                                 if not dst_node or (dst_node == src_node and dst_attr_parent == src_attr_parent):
 492                                         return True
 493                                 self.do_drag((src_node, src_attr_parent), (dst_node, dst_attr_parent))
 494                 else:
 495                         return False
 496                 return True
 497
 498         def marked_changed(self, nodes):
 499                 "nodes is a list of nodes to be rechecked."
 500                 self.update_all()
 501
 502         def options_changed(self):
 503                 if default_font.has_changed:
 504                         #self.modify_font(pango.FontDescription(default_font.value))
 505                         self.update_all()
 506
 507         def scroll_to(self, adj):
 508                 n = int(adj.value)
 509                 self.ensure_cache()
 510                 try:
 511                         node = self.cached_nodes[n]
 512                 except:
 513                         node = self.cached_nodes[-1]
 514                 if self.ref_node == node:
 515                         return
 516                 self.ref_node = node
 517                 x = 0
 518                 while node.parentNode:
 519                         x += 16
 520                         node = node.parentNode
 521                 self.ref_pos = (x, 0)
 522                 self.update_all()
 523
 524         def set_status(self, message):
 525                 self.parent_window.set_status(message)