git.maemo.org Git - gc-dialer/blob - src/util/qtpie.py

   1 #!/usr/bin/env python
   2
   3 import math
   4 import logging
   5
   6 from PyQt4 import QtGui
   7 from PyQt4 import QtCore
   8
   9 try:
  10         from util import misc as misc_utils
  11 except ImportError:
  12         class misc_utils(object):
  13
  14                 @staticmethod
  15                 def log_exception(logger):
  16
  17                         def wrapper(func):
  18                                 return func
  19                         return wrapper
  20
  21
  22 _moduleLogger = logging.getLogger(__name__)
  23
  24
  25 _TWOPI = 2 * math.pi
  26
  27
  28 def _radius_at(center, pos):
  29         delta = pos - center
  30         xDelta = delta.x()
  31         yDelta = delta.y()
  32
  33         radius = math.sqrt(xDelta ** 2 + yDelta ** 2)
  34         return radius
  35
  36
  37 def _angle_at(center, pos):
  38         delta = pos - center
  39         xDelta = delta.x()
  40         yDelta = delta.y()
  41
  42         radius = math.sqrt(xDelta ** 2 + yDelta ** 2)
  43         angle = math.acos(xDelta / radius)
  44         if 0 <= yDelta:
  45                 angle = _TWOPI - angle
  46
  47         return angle
  48
  49
  50 class QActionPieItem(object):
  51
  52         def __init__(self, action, weight = 1):
  53                 self._action = action
  54                 self._weight = weight
  55
  56         def action(self):
  57                 return self._action
  58
  59         def setWeight(self, weight):
  60                 self._weight = weight
  61
  62         def weight(self):
  63                 return self._weight
  64
  65         def setEnabled(self, enabled = True):
  66                 self._action.setEnabled(enabled)
  67
  68         def isEnabled(self):
  69                 return self._action.isEnabled()
  70
  71
  72 class PieFiling(object):
  73
  74         INNER_RADIUS_DEFAULT = 64
  75         OUTER_RADIUS_DEFAULT = 192
  76
  77         SELECTION_CENTER = -1
  78         SELECTION_NONE = -2
  79
  80         NULL_CENTER = QActionPieItem(QtGui.QAction(None))
  81
  82         def __init__(self):
  83                 self._innerRadius = self.INNER_RADIUS_DEFAULT
  84                 self._outerRadius = self.OUTER_RADIUS_DEFAULT
  85                 self._children = []
  86                 self._center = self.NULL_CENTER
  87
  88                 self._cacheIndexToAngle = {}
  89                 self._cacheTotalWeight = 0
  90
  91         def insertItem(self, item, index = -1):
  92                 self._children.insert(index, item)
  93                 self._invalidate_cache()
  94
  95         def removeItemAt(self, index):
  96                 item = self._children.pop(index)
  97                 self._invalidate_cache()
  98
  99         def set_center(self, item):
 100                 if item is None:
 101                         item = self.NULL_CENTER
 102                 self._center = item
 103
 104         def center(self):
 105                 return self._center
 106
 107         def clear(self):
 108                 del self._children[:]
 109                 self._center = self.NULL_CENTER
 110                 self._invalidate_cache()
 111
 112         def itemAt(self, index):
 113                 return self._children[index]
 114
 115         def indexAt(self, center, point):
 116                 return self._angle_to_index(_angle_at(center, point))
 117
 118         def innerRadius(self):
 119                 return self._innerRadius
 120
 121         def setInnerRadius(self, radius):
 122                 self._innerRadius = radius
 123
 124         def outerRadius(self):
 125                 return self._outerRadius
 126
 127         def setOuterRadius(self, radius):
 128                 self._outerRadius = radius
 129
 130         def __iter__(self):
 131                 return iter(self._children)
 132
 133         def __len__(self):
 134                 return len(self._children)
 135
 136         def __getitem__(self, index):
 137                 return self._children[index]
 138
 139         def _invalidate_cache(self):
 140                 self._cacheIndexToAngle.clear()
 141                 self._cacheTotalWeight = sum(child.weight() for child in self._children)
 142                 if self._cacheTotalWeight == 0:
 143                         self._cacheTotalWeight = 1
 144
 145         def _index_to_angle(self, index, isShifted):
 146                 key = index, isShifted
 147                 if key in self._cacheIndexToAngle:
 148                         return self._cacheIndexToAngle[key]
 149                 index = index % len(self._children)
 150
 151                 baseAngle = _TWOPI / self._cacheTotalWeight
 152
 153                 angle = math.pi / 2
 154                 if isShifted:
 155                         if self._children:
 156                                 angle -= (self._children[0].weight() * baseAngle) / 2
 157                         else:
 158                                 angle -= baseAngle / 2
 159                 while angle < 0:
 160                         angle += _TWOPI
 161
 162                 for i, child in enumerate(self._children):
 163                         if index < i:
 164                                 break
 165                         angle += child.weight() * baseAngle
 166                 while _TWOPI < angle:
 167                         angle -= _TWOPI
 168
 169                 self._cacheIndexToAngle[key] = angle
 170                 return angle
 171
 172         def _angle_to_index(self, angle):
 173                 numChildren = len(self._children)
 174                 if numChildren == 0:
 175                         return self.SELECTION_CENTER
 176
 177                 baseAngle = _TWOPI / self._cacheTotalWeight
 178
 179                 iterAngle = math.pi / 2 - (self.itemAt(0).weight() * baseAngle) / 2
 180                 while iterAngle < 0:
 181                         iterAngle += _TWOPI
 182
 183                 oldIterAngle = iterAngle
 184                 for index, child in enumerate(self._children):
 185                         iterAngle += child.weight() * baseAngle
 186                         if oldIterAngle < angle and angle <= iterAngle:
 187                                 return index - 1 if index != 0 else numChildren - 1
 188                         elif oldIterAngle < (angle + _TWOPI) and (angle + _TWOPI <= iterAngle):
 189                                 return index - 1 if index != 0 else numChildren - 1
 190                         oldIterAngle = iterAngle
 191
 192
 193 class PieArtist(object):
 194
 195         ICON_SIZE_DEFAULT = 48
 196
 197         SHAPE_CIRCLE = "circle"
 198         SHAPE_SQUARE = "square"
 199         DEFAULT_SHAPE = SHAPE_SQUARE
 200
 201         def __init__(self, filing):
 202                 self._filing = filing
 203
 204                 self._cachedOuterRadius = self._filing.outerRadius()
 205                 self._cachedInnerRadius = self._filing.innerRadius()
 206                 canvasSize = self._cachedOuterRadius * 2 + 1
 207                 self._canvas = QtGui.QPixmap(canvasSize, canvasSize)
 208                 self._mask = None
 209                 self.palette = None
 210
 211         def pieSize(self):
 212                 diameter = self._filing.outerRadius() * 2 + 1
 213                 return QtCore.QSize(diameter, diameter)
 214
 215         def centerSize(self):
 216                 painter = QtGui.QPainter(self._canvas)
 217                 text = self._filing.center().action().text()
 218                 fontMetrics = painter.fontMetrics()
 219                 if text:
 220                         textBoundingRect = fontMetrics.boundingRect(text)
 221                 else:
 222                         textBoundingRect = QtCore.QRect()
 223                 textWidth = textBoundingRect.width()
 224                 textHeight = textBoundingRect.height()
 225
 226                 return QtCore.QSize(
 227                         textWidth + self.ICON_SIZE_DEFAULT,
 228                         max(textHeight, self.ICON_SIZE_DEFAULT),
 229                 )
 230
 231         def show(self, palette):
 232                 self.palette = palette
 233
 234                 if (
 235                         self._cachedOuterRadius != self._filing.outerRadius() or
 236                         self._cachedInnerRadius != self._filing.innerRadius()
 237                 ):
 238                         self._cachedOuterRadius = self._filing.outerRadius()
 239                         self._cachedInnerRadius = self._filing.innerRadius()
 240                         self._canvas = self._canvas.scaled(self.pieSize())
 241
 242                 if self._mask is None:
 243                         self._mask = QtGui.QBitmap(self._canvas.size())
 244                         self._mask.fill(QtCore.Qt.color0)
 245                         self._generate_mask(self._mask)
 246                         self._canvas.setMask(self._mask)
 247                 return self._mask
 248
 249         def hide(self):
 250                 self.palette = None
 251
 252         def paint(self, selectionIndex):
 253                 painter = QtGui.QPainter(self._canvas)
 254                 painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
 255
 256                 adjustmentRect = self._canvas.rect().adjusted(0, 0, -1, -1)
 257
 258                 numChildren = len(self._filing)
 259                 if numChildren == 0:
 260                         if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 261                                 painter.setBrush(self.palette.highlight())
 262                         else:
 263                                 painter.setBrush(self.palette.window())
 264                         painter.setPen(self.palette.mid().color())
 265
 266                         painter.drawRect(self._canvas.rect())
 267                         self._paint_center_foreground(painter, selectionIndex)
 268                         return self._canvas
 269                 elif numChildren == 1:
 270                         if selectionIndex == 0 and self._filing[0].isEnabled():
 271                                 painter.setBrush(self.palette.highlight())
 272                         else:
 273                                 painter.setBrush(self.palette.window())
 274
 275                         painter.fillRect(self._canvas.rect(), painter.brush())
 276                 else:
 277                         for i in xrange(len(self._filing)):
 278                                 self._paint_slice_background(painter, adjustmentRect, i, selectionIndex)
 279
 280                 self._paint_center_background(painter, adjustmentRect, selectionIndex)
 281                 self._paint_center_foreground(painter, selectionIndex)
 282
 283                 for i in xrange(len(self._filing)):
 284                         self._paint_slice_foreground(painter, i, selectionIndex)
 285
 286                 return self._canvas
 287
 288         def _generate_mask(self, mask):
 289                 """
 290                 Specifies on the mask the shape of the pie menu
 291                 """
 292                 painter = QtGui.QPainter(mask)
 293                 painter.setPen(QtCore.Qt.color1)
 294                 painter.setBrush(QtCore.Qt.color1)
 295                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 296                         painter.drawRect(mask.rect())
 297                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 298                         painter.drawEllipse(mask.rect().adjusted(0, 0, -1, -1))
 299                 else:
 300                         raise NotImplementedError(self.DEFAULT_SHAPE)
 301
 302         def _paint_slice_background(self, painter, adjustmentRect, i, selectionIndex):
 303                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 304                         currentWidth = adjustmentRect.width()
 305                         newWidth = math.sqrt(2) * currentWidth
 306                         dx = (newWidth - currentWidth) / 2
 307                         adjustmentRect = adjustmentRect.adjusted(-dx, -dx, dx, dx)
 308                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 309                         pass
 310                 else:
 311                         raise NotImplementedError(self.DEFAULT_SHAPE)
 312
 313                 if i == selectionIndex and self._filing[i].isEnabled():
 314                         painter.setBrush(self.palette.highlight())
 315                 else:
 316                         painter.setBrush(self.palette.window())
 317                 painter.setPen(self.palette.mid().color())
 318
 319                 a = self._filing._index_to_angle(i, True)
 320                 b = self._filing._index_to_angle(i + 1, True)
 321                 if b < a:
 322                         b += _TWOPI
 323                 size = b - a
 324                 if size < 0:
 325                         size += _TWOPI
 326
 327                 startAngleInDeg = (a * 360 * 16) / _TWOPI
 328                 sizeInDeg = (size * 360 * 16) / _TWOPI
 329                 painter.drawPie(adjustmentRect, int(startAngleInDeg), int(sizeInDeg))
 330
 331         def _paint_slice_foreground(self, painter, i, selectionIndex):
 332                 child = self._filing[i]
 333
 334                 a = self._filing._index_to_angle(i, True)
 335                 b = self._filing._index_to_angle(i + 1, True)
 336                 if b < a:
 337                         b += _TWOPI
 338                 middleAngle = (a + b) / 2
 339                 averageRadius = (self._cachedInnerRadius + self._cachedOuterRadius) / 2
 340
 341                 sliceX = averageRadius * math.cos(middleAngle)
 342                 sliceY = - averageRadius * math.sin(middleAngle)
 343
 344                 piePos = self._canvas.rect().center()
 345                 pieX = piePos.x()
 346                 pieY = piePos.y()
 347                 self._paint_label(
 348                         painter, child.action(), i == selectionIndex, pieX+sliceX, pieY+sliceY
 349                 )
 350
 351         def _paint_label(self, painter, action, isSelected, x, y):
 352                 text = action.text()
 353                 fontMetrics = painter.fontMetrics()
 354                 if text:
 355                         textBoundingRect = fontMetrics.boundingRect(text)
 356                 else:
 357                         textBoundingRect = QtCore.QRect()
 358                 textWidth = textBoundingRect.width()
 359                 textHeight = textBoundingRect.height()
 360
 361                 icon = action.icon().pixmap(
 362                         QtCore.QSize(self.ICON_SIZE_DEFAULT, self.ICON_SIZE_DEFAULT),
 363                         QtGui.QIcon.Normal,
 364                         QtGui.QIcon.On,
 365                 )
 366                 iconWidth = icon.width()
 367                 iconHeight = icon.width()
 368                 averageWidth = (iconWidth + textWidth)/2
 369                 if not icon.isNull():
 370                         iconRect = QtCore.QRect(
 371                                 x - averageWidth,
 372                                 y - iconHeight/2,
 373                                 iconWidth,
 374                                 iconHeight,
 375                         )
 376
 377                         painter.drawPixmap(iconRect, icon)
 378
 379                 if text:
 380                         if isSelected:
 381                                 if action.isEnabled():
 382                                         pen = self.palette.highlightedText()
 383                                         brush = self.palette.highlight()
 384                                 else:
 385                                         pen = self.palette.mid()
 386                                         brush = self.palette.window()
 387                         else:
 388                                 if action.isEnabled():
 389                                         pen = self.palette.windowText()
 390                                 else:
 391                                         pen = self.palette.mid()
 392                                 brush = self.palette.window()
 393
 394                         leftX = x - averageWidth + iconWidth
 395                         topY = y + textHeight/2
 396                         painter.setPen(pen.color())
 397                         painter.setBrush(brush)
 398                         painter.drawText(leftX, topY, text)
 399
 400         def _paint_center_background(self, painter, adjustmentRect, selectionIndex):
 401                 dark = self.palette.mid().color()
 402                 light = self.palette.light().color()
 403                 if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 404                         background = self.palette.highlight().color()
 405                 else:
 406                         background = self.palette.window().color()
 407
 408                 innerRadius = self._cachedInnerRadius
 409                 adjustmentCenterPos = adjustmentRect.center()
 410                 innerRect = QtCore.QRect(
 411                         adjustmentCenterPos.x() - innerRadius,
 412                         adjustmentCenterPos.y() - innerRadius,
 413                         innerRadius * 2 + 1,
 414                         innerRadius * 2 + 1,
 415                 )
 416
 417                 painter.setPen(QtCore.Qt.NoPen)
 418                 painter.setBrush(background)
 419                 painter.drawPie(innerRect, 0, 360 * 16)
 420
 421                 painter.setPen(QtGui.QPen(dark, 1))
 422                 painter.setBrush(QtCore.Qt.NoBrush)
 423                 painter.drawEllipse(innerRect)
 424
 425                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 426                         pass
 427                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 428                         painter.setPen(QtGui.QPen(dark, 1))
 429                         painter.setBrush(QtCore.Qt.NoBrush)
 430                         painter.drawEllipse(adjustmentRect)
 431                 else:
 432                         raise NotImplementedError(self.DEFAULT_SHAPE)
 433
 434         def _paint_center_foreground(self, painter, selectionIndex):
 435                 centerPos = self._canvas.rect().center()
 436                 pieX = centerPos.x()
 437                 pieY = centerPos.y()
 438
 439                 x = pieX
 440                 y = pieY
 441
 442                 self._paint_label(
 443                         painter,
 444                         self._filing.center().action(),
 445                         selectionIndex == PieFiling.SELECTION_CENTER,
 446                         x, y
 447                 )
 448
 449
 450 class QPieDisplay(QtGui.QWidget):
 451
 452         def __init__(self, filing, parent = None, flags = QtCore.Qt.Window):
 453                 QtGui.QWidget.__init__(self, parent, flags)
 454                 self._filing = filing
 455                 self._artist = PieArtist(self._filing)
 456                 self._selectionIndex = PieFiling.SELECTION_NONE
 457
 458         def popup(self, pos):
 459                 self._update_selection(pos)
 460                 self.show()
 461
 462         def sizeHint(self):
 463                 return self._artist.pieSize()
 464
 465         @misc_utils.log_exception(_moduleLogger)
 466         def showEvent(self, showEvent):
 467                 mask = self._artist.show(self.palette())
 468                 self.setMask(mask)
 469
 470                 QtGui.QWidget.showEvent(self, showEvent)
 471
 472         @misc_utils.log_exception(_moduleLogger)
 473         def hideEvent(self, hideEvent):
 474                 self._artist.hide()
 475                 self._selectionIndex = PieFiling.SELECTION_NONE
 476                 QtGui.QWidget.hideEvent(self, hideEvent)
 477
 478         @misc_utils.log_exception(_moduleLogger)
 479         def paintEvent(self, paintEvent):
 480                 canvas = self._artist.paint(self._selectionIndex)
 481
 482                 screen = QtGui.QPainter(self)
 483                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 484
 485                 QtGui.QWidget.paintEvent(self, paintEvent)
 486
 487         def selectAt(self, index):
 488                 oldIndex = self._selectionIndex
 489                 self._selectionIndex = index
 490                 if self.isVisible():
 491                         self.update()
 492
 493
 494 class QPieButton(QtGui.QWidget):
 495
 496         activated = QtCore.pyqtSignal(int)
 497         highlighted = QtCore.pyqtSignal(int)
 498         canceled = QtCore.pyqtSignal()
 499         aboutToShow = QtCore.pyqtSignal()
 500         aboutToHide = QtCore.pyqtSignal()
 501
 502         BUTTON_RADIUS = 24
 503         DELAY = 250
 504
 505         def __init__(self, buttonSlice, parent = None, buttonSlices = None):
 506                 # @bug Artifacts on Maemo 5 due to window 3D effects, find way to disable them for just these?
 507                 # @bug The pie's are being pushed back on screen on Maemo, leading to coordinate issues
 508                 QtGui.QWidget.__init__(self, parent)
 509                 self._cachedCenterPosition = self.rect().center()
 510
 511                 self._filing = PieFiling()
 512                 self._display = QPieDisplay(self._filing, None, QtCore.Qt.SplashScreen)
 513                 self._selectionIndex = PieFiling.SELECTION_NONE
 514
 515                 self._buttonFiling = PieFiling()
 516                 self._buttonFiling.set_center(buttonSlice)
 517                 if buttonSlices is not None:
 518                         for slice in buttonSlices:
 519                                 self._buttonFiling.insertItem(slice)
 520                 self._buttonFiling.setOuterRadius(self.BUTTON_RADIUS)
 521                 self._buttonArtist = PieArtist(self._buttonFiling)
 522                 self._poppedUp = False
 523
 524                 self._delayPopupTimer = QtCore.QTimer()
 525                 self._delayPopupTimer.setInterval(self.DELAY)
 526                 self._delayPopupTimer.setSingleShot(True)
 527                 self._delayPopupTimer.timeout.connect(self._on_delayed_popup)
 528                 self._popupLocation = None
 529
 530                 self._mousePosition = None
 531                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 532                 self.setSizePolicy(
 533                         QtGui.QSizePolicy(
 534                                 QtGui.QSizePolicy.MinimumExpanding,
 535                                 QtGui.QSizePolicy.MinimumExpanding,
 536                         )
 537                 )
 538
 539         def insertItem(self, item, index = -1):
 540                 self._filing.insertItem(item, index)
 541
 542         def removeItemAt(self, index):
 543                 self._filing.removeItemAt(index)
 544
 545         def set_center(self, item):
 546                 self._filing.set_center(item)
 547
 548         def set_button(self, item):
 549                 self.update()
 550
 551         def clear(self):
 552                 self._filing.clear()
 553
 554         def itemAt(self, index):
 555                 return self._filing.itemAt(index)
 556
 557         def indexAt(self, point):
 558                 return self._filing.indexAt(self._cachedCenterPosition, point)
 559
 560         def innerRadius(self):
 561                 return self._filing.innerRadius()
 562
 563         def setInnerRadius(self, radius):
 564                 self._filing.setInnerRadius(radius)
 565
 566         def outerRadius(self):
 567                 return self._filing.outerRadius()
 568
 569         def setOuterRadius(self, radius):
 570                 self._filing.setOuterRadius(radius)
 571
 572         def buttonRadius(self):
 573                 return self._buttonFiling.outerRadius()
 574
 575         def setButtonRadius(self, radius):
 576                 self._buttonFiling.setOuterRadius(radius)
 577                 self._buttonFiling.setInnerRadius(radius / 2)
 578                 self._buttonArtist.show(self.palette())
 579
 580         def sizeHint(self):
 581                 return self._buttonArtist.pieSize()
 582
 583         def minimumSizeHint(self):
 584                 return self._buttonArtist.centerSize()
 585
 586         @misc_utils.log_exception(_moduleLogger)
 587         def mousePressEvent(self, mouseEvent):
 588                 lastSelection = self._selectionIndex
 589
 590                 lastMousePos = mouseEvent.pos()
 591                 self._mousePosition = lastMousePos
 592                 self._update_selection(self._cachedCenterPosition)
 593
 594                 self.highlighted.emit(self._selectionIndex)
 595
 596                 self._display.selectAt(self._selectionIndex)
 597                 self._popupLocation = mouseEvent.globalPos()
 598                 self._delayPopupTimer.start()
 599
 600         @QtCore.pyqtSlot()
 601         @misc_utils.log_exception(_moduleLogger)
 602         def _on_delayed_popup(self):
 603                 assert self._popupLocation is not None, "Widget location abuse"
 604                 self._popup_child(self._popupLocation)
 605
 606         @misc_utils.log_exception(_moduleLogger)
 607         def mouseMoveEvent(self, mouseEvent):
 608                 lastSelection = self._selectionIndex
 609
 610                 lastMousePos = mouseEvent.pos()
 611                 if self._mousePosition is None:
 612                         # Absolute
 613                         self._update_selection(lastMousePos)
 614                 else:
 615                         # Relative
 616                         self._update_selection(
 617                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 618                                 ignoreOuter = True,
 619                         )
 620
 621                 if lastSelection != self._selectionIndex:
 622                         self.highlighted.emit(self._selectionIndex)
 623                         self._display.selectAt(self._selectionIndex)
 624
 625                 if self._selectionIndex != PieFiling.SELECTION_CENTER and self._delayPopupTimer.isActive():
 626                         self._on_delayed_popup()
 627
 628         @misc_utils.log_exception(_moduleLogger)
 629         def mouseReleaseEvent(self, mouseEvent):
 630                 self._delayPopupTimer.stop()
 631                 self._popupLocation = None
 632
 633                 lastSelection = self._selectionIndex
 634
 635                 lastMousePos = mouseEvent.pos()
 636                 if self._mousePosition is None:
 637                         # Absolute
 638                         self._update_selection(lastMousePos)
 639                 else:
 640                         # Relative
 641                         self._update_selection(
 642                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 643                                 ignoreOuter = True,
 644                         )
 645                 self._mousePosition = None
 646
 647                 self._activate_at(self._selectionIndex)
 648                 self._hide_child()
 649
 650         @misc_utils.log_exception(_moduleLogger)
 651         def keyPressEvent(self, keyEvent):
 652                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 653                         self._popup_child(QtGui.QCursor.pos())
 654                         if self._selectionIndex != len(self._filing) - 1:
 655                                 nextSelection = self._selectionIndex + 1
 656                         else:
 657                                 nextSelection = 0
 658                         self._select_at(nextSelection)
 659                         self._display.selectAt(self._selectionIndex)
 660                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 661                         self._popup_child(QtGui.QCursor.pos())
 662                         if 0 < self._selectionIndex:
 663                                 nextSelection = self._selectionIndex - 1
 664                         else:
 665                                 nextSelection = len(self._filing) - 1
 666                         self._select_at(nextSelection)
 667                         self._display.selectAt(self._selectionIndex)
 668                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 669                         self._popup_child(QtGui.QCursor.pos())
 670                         self._select_at(PieFiling.SELECTION_CENTER)
 671                         self._display.selectAt(self._selectionIndex)
 672                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 673                         self._delayPopupTimer.stop()
 674                         self._popupLocation = None
 675                         self._activate_at(self._selectionIndex)
 676                         self._hide_child()
 677                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 678                         self._delayPopupTimer.stop()
 679                         self._popupLocation = None
 680                         self._activate_at(PieFiling.SELECTION_NONE)
 681                         self._hide_child()
 682                 else:
 683                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 684
 685         @misc_utils.log_exception(_moduleLogger)
 686         def resizeEvent(self, resizeEvent):
 687                 self.setButtonRadius(min(resizeEvent.size().width(), resizeEvent.size().height()) / 2 - 1)
 688                 QtGui.QWidget.resizeEvent(self, resizeEvent)
 689
 690         @misc_utils.log_exception(_moduleLogger)
 691         def showEvent(self, showEvent):
 692                 self._buttonArtist.show(self.palette())
 693                 self._cachedCenterPosition = self.rect().center()
 694
 695                 QtGui.QWidget.showEvent(self, showEvent)
 696
 697         @misc_utils.log_exception(_moduleLogger)
 698         def hideEvent(self, hideEvent):
 699                 self._display.hide()
 700                 self._select_at(PieFiling.SELECTION_NONE)
 701                 QtGui.QWidget.hideEvent(self, hideEvent)
 702
 703         @misc_utils.log_exception(_moduleLogger)
 704         def paintEvent(self, paintEvent):
 705                 self.setButtonRadius(min(self.rect().width(), self.rect().height()) / 2 - 1)
 706                 if self._poppedUp:
 707                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_CENTER)
 708                 else:
 709                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_NONE)
 710
 711                 screen = QtGui.QPainter(self)
 712                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 713
 714                 QtGui.QWidget.paintEvent(self, paintEvent)
 715
 716         def __iter__(self):
 717                 return iter(self._filing)
 718
 719         def __len__(self):
 720                 return len(self._filing)
 721
 722         def _popup_child(self, position):
 723                 self._poppedUp = True
 724                 self.aboutToShow.emit()
 725
 726                 self._delayPopupTimer.stop()
 727                 self._popupLocation = None
 728
 729                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 730                 self._display.move(position)
 731                 self._display.show()
 732
 733                 self.update()
 734
 735         def _hide_child(self):
 736                 self._poppedUp = False
 737                 self.aboutToHide.emit()
 738                 self._display.hide()
 739                 self.update()
 740
 741         def _select_at(self, index):
 742                 self._selectionIndex = index
 743
 744         def _update_selection(self, lastMousePos, ignoreOuter = False):
 745                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 746                 if radius < self._filing.innerRadius():
 747                         self._select_at(PieFiling.SELECTION_CENTER)
 748                 elif radius <= self._filing.outerRadius() or ignoreOuter:
 749                         self._select_at(self.indexAt(lastMousePos))
 750                 else:
 751                         self._select_at(PieFiling.SELECTION_NONE)
 752
 753         def _activate_at(self, index):
 754                 if index == PieFiling.SELECTION_NONE:
 755                         self.canceled.emit()
 756                         return
 757                 elif index == PieFiling.SELECTION_CENTER:
 758                         child = self._filing.center()
 759                 else:
 760                         child = self.itemAt(index)
 761
 762                 if child.action().isEnabled():
 763                         child.action().trigger()
 764                         self.activated.emit(index)
 765                 else:
 766                         self.canceled.emit()
 767
 768
 769 class QPieMenu(QtGui.QWidget):
 770
 771         activated = QtCore.pyqtSignal(int)
 772         highlighted = QtCore.pyqtSignal(int)
 773         canceled = QtCore.pyqtSignal()
 774         aboutToShow = QtCore.pyqtSignal()
 775         aboutToHide = QtCore.pyqtSignal()
 776
 777         def __init__(self, parent = None):
 778                 QtGui.QWidget.__init__(self, parent)
 779                 self._cachedCenterPosition = self.rect().center()
 780
 781                 self._filing = PieFiling()
 782                 self._artist = PieArtist(self._filing)
 783                 self._selectionIndex = PieFiling.SELECTION_NONE
 784
 785                 self._mousePosition = ()
 786                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 787
 788         def popup(self, pos):
 789                 self._update_selection(pos)
 790                 self.show()
 791
 792         def insertItem(self, item, index = -1):
 793                 self._filing.insertItem(item, index)
 794                 self.update()
 795
 796         def removeItemAt(self, index):
 797                 self._filing.removeItemAt(index)
 798                 self.update()
 799
 800         def set_center(self, item):
 801                 self._filing.set_center(item)
 802                 self.update()
 803
 804         def clear(self):
 805                 self._filing.clear()
 806                 self.update()
 807
 808         def itemAt(self, index):
 809                 return self._filing.itemAt(index)
 810
 811         def indexAt(self, point):
 812                 return self._filing.indexAt(self._cachedCenterPosition, point)
 813
 814         def innerRadius(self):
 815                 return self._filing.innerRadius()
 816
 817         def setInnerRadius(self, radius):
 818                 self._filing.setInnerRadius(radius)
 819                 self.update()
 820
 821         def outerRadius(self):
 822                 return self._filing.outerRadius()
 823
 824         def setOuterRadius(self, radius):
 825                 self._filing.setOuterRadius(radius)
 826                 self.update()
 827
 828         def sizeHint(self):
 829                 return self._artist.pieSize()
 830
 831         @misc_utils.log_exception(_moduleLogger)
 832         def mousePressEvent(self, mouseEvent):
 833                 lastSelection = self._selectionIndex
 834
 835                 lastMousePos = mouseEvent.pos()
 836                 self._update_selection(lastMousePos)
 837                 self._mousePosition = lastMousePos
 838
 839                 if lastSelection != self._selectionIndex:
 840                         self.highlighted.emit(self._selectionIndex)
 841                         self.update()
 842
 843         @misc_utils.log_exception(_moduleLogger)
 844         def mouseMoveEvent(self, mouseEvent):
 845                 lastSelection = self._selectionIndex
 846
 847                 lastMousePos = mouseEvent.pos()
 848                 self._update_selection(lastMousePos)
 849
 850                 if lastSelection != self._selectionIndex:
 851                         self.highlighted.emit(self._selectionIndex)
 852                         self.update()
 853
 854         @misc_utils.log_exception(_moduleLogger)
 855         def mouseReleaseEvent(self, mouseEvent):
 856                 lastSelection = self._selectionIndex
 857
 858                 lastMousePos = mouseEvent.pos()
 859                 self._update_selection(lastMousePos)
 860                 self._mousePosition = ()
 861
 862                 self._activate_at(self._selectionIndex)
 863                 self.update()
 864
 865         @misc_utils.log_exception(_moduleLogger)
 866         def keyPressEvent(self, keyEvent):
 867                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 868                         if self._selectionIndex != len(self._filing) - 1:
 869                                 nextSelection = self._selectionIndex + 1
 870                         else:
 871                                 nextSelection = 0
 872                         self._select_at(nextSelection)
 873                         self.update()
 874                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 875                         if 0 < self._selectionIndex:
 876                                 nextSelection = self._selectionIndex - 1
 877                         else:
 878                                 nextSelection = len(self._filing) - 1
 879                         self._select_at(nextSelection)
 880                         self.update()
 881                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 882                         self._activate_at(self._selectionIndex)
 883                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 884                         self._activate_at(PieFiling.SELECTION_NONE)
 885                 else:
 886                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 887
 888         @misc_utils.log_exception(_moduleLogger)
 889         def showEvent(self, showEvent):
 890                 self.aboutToShow.emit()
 891                 self._cachedCenterPosition = self.rect().center()
 892
 893                 mask = self._artist.show(self.palette())
 894                 self.setMask(mask)
 895
 896                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 897                 self._update_selection(lastMousePos)
 898
 899                 QtGui.QWidget.showEvent(self, showEvent)
 900
 901         @misc_utils.log_exception(_moduleLogger)
 902         def hideEvent(self, hideEvent):
 903                 self._artist.hide()
 904                 self._selectionIndex = PieFiling.SELECTION_NONE
 905                 QtGui.QWidget.hideEvent(self, hideEvent)
 906
 907         @misc_utils.log_exception(_moduleLogger)
 908         def paintEvent(self, paintEvent):
 909                 canvas = self._artist.paint(self._selectionIndex)
 910
 911                 screen = QtGui.QPainter(self)
 912                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 913
 914                 QtGui.QWidget.paintEvent(self, paintEvent)
 915
 916         def __iter__(self):
 917                 return iter(self._filing)
 918
 919         def __len__(self):
 920                 return len(self._filing)
 921
 922         def _select_at(self, index):
 923                 self._selectionIndex = index
 924
 925         def _update_selection(self, lastMousePos):
 926                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 927                 if radius < self._filing.innerRadius():
 928                         self._selectionIndex = PieFiling.SELECTION_CENTER
 929                 elif radius <= self._filing.outerRadius():
 930                         self._select_at(self.indexAt(lastMousePos))
 931                 else:
 932                         self._selectionIndex = PieFiling.SELECTION_NONE
 933
 934         def _activate_at(self, index):
 935                 if index == PieFiling.SELECTION_NONE:
 936                         self.canceled.emit()
 937                         self.aboutToHide.emit()
 938                         self.hide()
 939                         return
 940                 elif index == PieFiling.SELECTION_CENTER:
 941                         child = self._filing.center()
 942                 else:
 943                         child = self.itemAt(index)
 944
 945                 if child.isEnabled():
 946                         child.action().trigger()
 947                         self.activated.emit(index)
 948                 else:
 949                         self.canceled.emit()
 950                 self.aboutToHide.emit()
 951                 self.hide()
 952
 953
 954 def init_pies():
 955         PieFiling.NULL_CENTER.setEnabled(False)
 956
 957
 958 def _print(msg):
 959         print msg
 960
 961
 962 def _on_about_to_hide(app):
 963         app.exit()
 964
 965
 966 if __name__ == "__main__":
 967         app = QtGui.QApplication([])
 968         init_pies()
 969
 970         if False:
 971                 pie = QPieMenu()
 972                 pie.show()
 973
 974         if False:
 975                 singleAction = QtGui.QAction(None)
 976                 singleAction.setText("Boo")
 977                 singleItem = QActionPieItem(singleAction)
 978                 spie = QPieMenu()
 979                 spie.insertItem(singleItem)
 980                 spie.show()
 981
 982         if False:
 983                 oneAction = QtGui.QAction(None)
 984                 oneAction.setText("Chew")
 985                 oneItem = QActionPieItem(oneAction)
 986                 twoAction = QtGui.QAction(None)
 987                 twoAction.setText("Foo")
 988                 twoItem = QActionPieItem(twoAction)
 989                 iconTextAction = QtGui.QAction(None)
 990                 iconTextAction.setText("Icon")
 991                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 992                 iconTextItem = QActionPieItem(iconTextAction)
 993                 mpie = QPieMenu()
 994                 mpie.insertItem(oneItem)
 995                 mpie.insertItem(twoItem)
 996                 mpie.insertItem(oneItem)
 997                 mpie.insertItem(iconTextItem)
 998                 mpie.show()
 999
1000         if True:
1001                 oneAction = QtGui.QAction(None)
1002                 oneAction.setText("Chew")
1003                 oneAction.triggered.connect(lambda: _print("Chew"))
1004                 oneItem = QActionPieItem(oneAction)
1005                 twoAction = QtGui.QAction(None)
1006                 twoAction.setText("Foo")
1007                 twoAction.triggered.connect(lambda: _print("Foo"))
1008                 twoItem = QActionPieItem(twoAction)
1009                 iconAction = QtGui.QAction(None)
1010                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1011                 iconAction.triggered.connect(lambda: _print("Icon"))
1012                 iconItem = QActionPieItem(iconAction)
1013                 iconTextAction = QtGui.QAction(None)
1014                 iconTextAction.setText("Icon")
1015                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1016                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1017                 iconTextItem = QActionPieItem(iconTextAction)
1018                 mpie = QPieMenu()
1019                 mpie.set_center(iconItem)
1020                 mpie.insertItem(oneItem)
1021                 mpie.insertItem(twoItem)
1022                 mpie.insertItem(oneItem)
1023                 mpie.insertItem(iconTextItem)
1024                 mpie.show()
1025                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1026                 mpie.canceled.connect(lambda: _print("Canceled"))
1027
1028         if False:
1029                 oneAction = QtGui.QAction(None)
1030                 oneAction.setText("Chew")
1031                 oneAction.triggered.connect(lambda: _print("Chew"))
1032                 oneItem = QActionPieItem(oneAction)
1033                 twoAction = QtGui.QAction(None)
1034                 twoAction.setText("Foo")
1035                 twoAction.triggered.connect(lambda: _print("Foo"))
1036                 twoItem = QActionPieItem(twoAction)
1037                 iconAction = QtGui.QAction(None)
1038                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1039                 iconAction.triggered.connect(lambda: _print("Icon"))
1040                 iconItem = QActionPieItem(iconAction)
1041                 iconTextAction = QtGui.QAction(None)
1042                 iconTextAction.setText("Icon")
1043                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1044                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1045                 iconTextItem = QActionPieItem(iconTextAction)
1046                 pieFiling = PieFiling()
1047                 pieFiling.set_center(iconItem)
1048                 pieFiling.insertItem(oneItem)
1049                 pieFiling.insertItem(twoItem)
1050                 pieFiling.insertItem(oneItem)
1051                 pieFiling.insertItem(iconTextItem)
1052                 mpie = QPieDisplay(pieFiling)
1053                 mpie.show()
1054
1055         if False:
1056                 oneAction = QtGui.QAction(None)
1057                 oneAction.setText("Chew")
1058                 oneAction.triggered.connect(lambda: _print("Chew"))
1059                 oneItem = QActionPieItem(oneAction)
1060                 twoAction = QtGui.QAction(None)
1061                 twoAction.setText("Foo")
1062                 twoAction.triggered.connect(lambda: _print("Foo"))
1063                 twoItem = QActionPieItem(twoAction)
1064                 iconAction = QtGui.QAction(None)
1065                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1066                 iconAction.triggered.connect(lambda: _print("Icon"))
1067                 iconItem = QActionPieItem(iconAction)
1068                 iconTextAction = QtGui.QAction(None)
1069                 iconTextAction.setText("Icon")
1070                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1071                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1072                 iconTextItem = QActionPieItem(iconTextAction)
1073                 mpie = QPieButton(iconItem)
1074                 mpie.set_center(iconItem)
1075                 mpie.insertItem(oneItem)
1076                 mpie.insertItem(twoItem)
1077                 mpie.insertItem(oneItem)
1078                 mpie.insertItem(iconTextItem)
1079                 mpie.show()
1080                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1081                 mpie.canceled.connect(lambda: _print("Canceled"))
1082
1083         app.exec_()