git.maemo.org Git - gonvert/blob - gonvert/util/qtpie.py

   1 #!/usr/bin/env python
   2
   3 import math
   4 import logging
   5
   6 import qt_compat
   7 QtCore = qt_compat.QtCore
   8 QtGui = qt_compat.import_module("QtGui")
   9
  10 import misc as misc_utils
  11
  12
  13 _moduleLogger = logging.getLogger(__name__)
  14
  15
  16 _TWOPI = 2 * math.pi
  17
  18
  19 def _radius_at(center, pos):
  20         delta = pos - center
  21         xDelta = delta.x()
  22         yDelta = delta.y()
  23
  24         radius = math.sqrt(xDelta ** 2 + yDelta ** 2)
  25         return radius
  26
  27
  28 def _angle_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         angle = math.acos(xDelta / radius)
  35         if 0 <= yDelta:
  36                 angle = _TWOPI - angle
  37
  38         return angle
  39
  40
  41 class QActionPieItem(object):
  42
  43         def __init__(self, action, weight = 1):
  44                 self._action = action
  45                 self._weight = weight
  46
  47         def action(self):
  48                 return self._action
  49
  50         def setWeight(self, weight):
  51                 self._weight = weight
  52
  53         def weight(self):
  54                 return self._weight
  55
  56         def setEnabled(self, enabled = True):
  57                 self._action.setEnabled(enabled)
  58
  59         def isEnabled(self):
  60                 return self._action.isEnabled()
  61
  62
  63 class PieFiling(object):
  64
  65         INNER_RADIUS_DEFAULT = 64
  66         OUTER_RADIUS_DEFAULT = 192
  67
  68         SELECTION_CENTER = -1
  69         SELECTION_NONE = -2
  70
  71         NULL_CENTER = QActionPieItem(QtGui.QAction(None))
  72
  73         def __init__(self):
  74                 self._innerRadius = self.INNER_RADIUS_DEFAULT
  75                 self._outerRadius = self.OUTER_RADIUS_DEFAULT
  76                 self._children = []
  77                 self._center = self.NULL_CENTER
  78
  79                 self._cacheIndexToAngle = {}
  80                 self._cacheTotalWeight = 0
  81
  82         def insertItem(self, item, index = -1):
  83                 self._children.insert(index, item)
  84                 self._invalidate_cache()
  85
  86         def removeItemAt(self, index):
  87                 item = self._children.pop(index)
  88                 self._invalidate_cache()
  89
  90         def set_center(self, item):
  91                 if item is None:
  92                         item = self.NULL_CENTER
  93                 self._center = item
  94
  95         def center(self):
  96                 return self._center
  97
  98         def clear(self):
  99                 del self._children[:]
 100                 self._center = self.NULL_CENTER
 101                 self._invalidate_cache()
 102
 103         def itemAt(self, index):
 104                 return self._children[index]
 105
 106         def indexAt(self, center, point):
 107                 return self._angle_to_index(_angle_at(center, point))
 108
 109         def innerRadius(self):
 110                 return self._innerRadius
 111
 112         def setInnerRadius(self, radius):
 113                 self._innerRadius = radius
 114
 115         def outerRadius(self):
 116                 return self._outerRadius
 117
 118         def setOuterRadius(self, radius):
 119                 self._outerRadius = radius
 120
 121         def __iter__(self):
 122                 return iter(self._children)
 123
 124         def __len__(self):
 125                 return len(self._children)
 126
 127         def __getitem__(self, index):
 128                 return self._children[index]
 129
 130         def _invalidate_cache(self):
 131                 self._cacheIndexToAngle.clear()
 132                 self._cacheTotalWeight = sum(child.weight() for child in self._children)
 133                 if self._cacheTotalWeight == 0:
 134                         self._cacheTotalWeight = 1
 135
 136         def _index_to_angle(self, index, isShifted):
 137                 key = index, isShifted
 138                 if key in self._cacheIndexToAngle:
 139                         return self._cacheIndexToAngle[key]
 140                 index = index % len(self._children)
 141
 142                 baseAngle = _TWOPI / self._cacheTotalWeight
 143
 144                 angle = math.pi / 2
 145                 if isShifted:
 146                         if self._children:
 147                                 angle -= (self._children[0].weight() * baseAngle) / 2
 148                         else:
 149                                 angle -= baseAngle / 2
 150                 while angle < 0:
 151                         angle += _TWOPI
 152
 153                 for i, child in enumerate(self._children):
 154                         if index < i:
 155                                 break
 156                         angle += child.weight() * baseAngle
 157                 while _TWOPI < angle:
 158                         angle -= _TWOPI
 159
 160                 self._cacheIndexToAngle[key] = angle
 161                 return angle
 162
 163         def _angle_to_index(self, angle):
 164                 numChildren = len(self._children)
 165                 if numChildren == 0:
 166                         return self.SELECTION_CENTER
 167
 168                 baseAngle = _TWOPI / self._cacheTotalWeight
 169
 170                 iterAngle = math.pi / 2 - (self.itemAt(0).weight() * baseAngle) / 2
 171                 while iterAngle < 0:
 172                         iterAngle += _TWOPI
 173
 174                 oldIterAngle = iterAngle
 175                 for index, child in enumerate(self._children):
 176                         iterAngle += child.weight() * baseAngle
 177                         if oldIterAngle < angle and angle <= iterAngle:
 178                                 return index - 1 if index != 0 else numChildren - 1
 179                         elif oldIterAngle < (angle + _TWOPI) and (angle + _TWOPI <= iterAngle):
 180                                 return index - 1 if index != 0 else numChildren - 1
 181                         oldIterAngle = iterAngle
 182
 183
 184 class PieArtist(object):
 185
 186         ICON_SIZE_DEFAULT = 48
 187
 188         SHAPE_CIRCLE = "circle"
 189         SHAPE_SQUARE = "square"
 190         DEFAULT_SHAPE = SHAPE_SQUARE
 191
 192         BACKGROUND_FILL = "fill"
 193         BACKGROUND_NOFILL = "no fill"
 194
 195         def __init__(self, filing, background = BACKGROUND_FILL):
 196                 self._filing = filing
 197
 198                 self._cachedOuterRadius = self._filing.outerRadius()
 199                 self._cachedInnerRadius = self._filing.innerRadius()
 200                 canvasSize = self._cachedOuterRadius * 2 + 1
 201                 self._canvas = QtGui.QPixmap(canvasSize, canvasSize)
 202                 self._mask = None
 203                 self._backgroundState = background
 204                 self.palette = None
 205
 206         def pieSize(self):
 207                 diameter = self._filing.outerRadius() * 2 + 1
 208                 return QtCore.QSize(diameter, diameter)
 209
 210         def centerSize(self):
 211                 painter = QtGui.QPainter(self._canvas)
 212                 text = self._filing.center().action().text()
 213                 fontMetrics = painter.fontMetrics()
 214                 if text:
 215                         textBoundingRect = fontMetrics.boundingRect(text)
 216                 else:
 217                         textBoundingRect = QtCore.QRect()
 218                 textWidth = textBoundingRect.width()
 219                 textHeight = textBoundingRect.height()
 220
 221                 return QtCore.QSize(
 222                         textWidth + self.ICON_SIZE_DEFAULT,
 223                         max(textHeight, self.ICON_SIZE_DEFAULT),
 224                 )
 225
 226         def show(self, palette):
 227                 self.palette = palette
 228
 229                 if (
 230                         self._cachedOuterRadius != self._filing.outerRadius() or
 231                         self._cachedInnerRadius != self._filing.innerRadius()
 232                 ):
 233                         self._cachedOuterRadius = self._filing.outerRadius()
 234                         self._cachedInnerRadius = self._filing.innerRadius()
 235                         self._canvas = self._canvas.scaled(self.pieSize())
 236
 237                 if self._mask is None:
 238                         self._mask = QtGui.QBitmap(self._canvas.size())
 239                         self._mask.fill(QtCore.Qt.color0)
 240                         self._generate_mask(self._mask)
 241                         self._canvas.setMask(self._mask)
 242                 return self._mask
 243
 244         def hide(self):
 245                 self.palette = None
 246
 247         def paint(self, selectionIndex):
 248                 painter = QtGui.QPainter(self._canvas)
 249                 painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
 250
 251                 self.paintPainter(selectionIndex, painter)
 252
 253                 return self._canvas
 254
 255         def paintPainter(self, selectionIndex, painter):
 256                 adjustmentRect = painter.viewport().adjusted(0, 0, -1, -1)
 257
 258                 numChildren = len(self._filing)
 259                 if numChildren == 0:
 260                         self._paint_center_background(painter, adjustmentRect, selectionIndex)
 261                         self._paint_center_foreground(painter, adjustmentRect, selectionIndex)
 262                         return self._canvas
 263                 else:
 264                         for i in xrange(len(self._filing)):
 265                                 self._paint_slice_background(painter, adjustmentRect, i, selectionIndex)
 266
 267                 self._paint_center_background(painter, adjustmentRect, selectionIndex)
 268                 self._paint_center_foreground(painter, adjustmentRect, selectionIndex)
 269
 270                 for i in xrange(len(self._filing)):
 271                         self._paint_slice_foreground(painter, adjustmentRect, i, selectionIndex)
 272
 273         def _generate_mask(self, mask):
 274                 """
 275                 Specifies on the mask the shape of the pie menu
 276                 """
 277                 painter = QtGui.QPainter(mask)
 278                 painter.setPen(QtCore.Qt.color1)
 279                 painter.setBrush(QtCore.Qt.color1)
 280                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 281                         painter.drawRect(mask.rect())
 282                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 283                         painter.drawEllipse(mask.rect().adjusted(0, 0, -1, -1))
 284                 else:
 285                         raise NotImplementedError(self.DEFAULT_SHAPE)
 286
 287         def _paint_slice_background(self, painter, adjustmentRect, i, selectionIndex):
 288                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 289                         currentWidth = adjustmentRect.width()
 290                         newWidth = math.sqrt(2) * currentWidth
 291                         dx = (newWidth - currentWidth) / 2
 292                         adjustmentRect = adjustmentRect.adjusted(-dx, -dx, dx, dx)
 293                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 294                         pass
 295                 else:
 296                         raise NotImplementedError(self.DEFAULT_SHAPE)
 297
 298                 if self._backgroundState == self.BACKGROUND_NOFILL:
 299                         painter.setBrush(QtGui.QBrush(QtCore.Qt.transparent))
 300                         painter.setPen(self.palette.highlight().color())
 301                 else:
 302                         if i == selectionIndex and self._filing[i].isEnabled():
 303                                 painter.setBrush(self.palette.highlight())
 304                                 painter.setPen(self.palette.highlight().color())
 305                         else:
 306                                 painter.setBrush(self.palette.window())
 307                                 painter.setPen(self.palette.window().color())
 308
 309                 a = self._filing._index_to_angle(i, True)
 310                 b = self._filing._index_to_angle(i + 1, True)
 311                 if b < a:
 312                         b += _TWOPI
 313                 size = b - a
 314                 if size < 0:
 315                         size += _TWOPI
 316
 317                 startAngleInDeg = (a * 360 * 16) / _TWOPI
 318                 sizeInDeg = (size * 360 * 16) / _TWOPI
 319                 painter.drawPie(adjustmentRect, int(startAngleInDeg), int(sizeInDeg))
 320
 321         def _paint_slice_foreground(self, painter, adjustmentRect, i, selectionIndex):
 322                 child = self._filing[i]
 323
 324                 a = self._filing._index_to_angle(i, True)
 325                 b = self._filing._index_to_angle(i + 1, True)
 326                 if b < a:
 327                         b += _TWOPI
 328                 middleAngle = (a + b) / 2
 329                 averageRadius = (self._cachedInnerRadius + self._cachedOuterRadius) / 2
 330
 331                 sliceX = averageRadius * math.cos(middleAngle)
 332                 sliceY = - averageRadius * math.sin(middleAngle)
 333
 334                 piePos = adjustmentRect.center()
 335                 pieX = piePos.x()
 336                 pieY = piePos.y()
 337                 self._paint_label(
 338                         painter, child.action(), i == selectionIndex, pieX+sliceX, pieY+sliceY
 339                 )
 340
 341         def _paint_label(self, painter, action, isSelected, x, y):
 342                 text = action.text()
 343                 fontMetrics = painter.fontMetrics()
 344                 if text:
 345                         textBoundingRect = fontMetrics.boundingRect(text)
 346                 else:
 347                         textBoundingRect = QtCore.QRect()
 348                 textWidth = textBoundingRect.width()
 349                 textHeight = textBoundingRect.height()
 350
 351                 icon = action.icon().pixmap(
 352                         QtCore.QSize(self.ICON_SIZE_DEFAULT, self.ICON_SIZE_DEFAULT),
 353                         QtGui.QIcon.Normal,
 354                         QtGui.QIcon.On,
 355                 )
 356                 iconWidth = icon.width()
 357                 iconHeight = icon.width()
 358                 averageWidth = (iconWidth + textWidth)/2
 359                 if not icon.isNull():
 360                         iconRect = QtCore.QRect(
 361                                 x - averageWidth,
 362                                 y - iconHeight/2,
 363                                 iconWidth,
 364                                 iconHeight,
 365                         )
 366
 367                         painter.drawPixmap(iconRect, icon)
 368
 369                 if text:
 370                         if isSelected:
 371                                 if action.isEnabled():
 372                                         pen = self.palette.highlightedText()
 373                                         brush = self.palette.highlight()
 374                                 else:
 375                                         pen = self.palette.mid()
 376                                         brush = self.palette.window()
 377                         else:
 378                                 if action.isEnabled():
 379                                         pen = self.palette.windowText()
 380                                 else:
 381                                         pen = self.palette.mid()
 382                                 brush = self.palette.window()
 383
 384                         leftX = x - averageWidth + iconWidth
 385                         topY = y + textHeight/2
 386                         painter.setPen(pen.color())
 387                         painter.setBrush(brush)
 388                         painter.drawText(leftX, topY, text)
 389
 390         def _paint_center_background(self, painter, adjustmentRect, selectionIndex):
 391                 if self._backgroundState == self.BACKGROUND_NOFILL:
 392                         return
 393                 if len(self._filing) == 0:
 394                         if self._backgroundState == self.BACKGROUND_NOFILL:
 395                                 painter.setBrush(QtGui.QBrush(QtCore.Qt.transparent))
 396                         else:
 397                                 if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 398                                         painter.setBrush(self.palette.highlight())
 399                                 else:
 400                                         painter.setBrush(self.palette.window())
 401                         painter.setPen(self.palette.mid().color())
 402
 403                         painter.drawRect(adjustmentRect)
 404                 else:
 405                         dark = self.palette.mid().color()
 406                         light = self.palette.light().color()
 407                         if self._backgroundState == self.BACKGROUND_NOFILL:
 408                                 background = QtGui.QBrush(QtCore.Qt.transparent)
 409                         else:
 410                                 if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 411                                         background = self.palette.highlight().color()
 412                                 else:
 413                                         background = self.palette.window().color()
 414
 415                         innerRadius = self._cachedInnerRadius
 416                         adjustmentCenterPos = adjustmentRect.center()
 417                         innerRect = QtCore.QRect(
 418                                 adjustmentCenterPos.x() - innerRadius,
 419                                 adjustmentCenterPos.y() - innerRadius,
 420                                 innerRadius * 2 + 1,
 421                                 innerRadius * 2 + 1,
 422                         )
 423
 424                         painter.setPen(QtCore.Qt.NoPen)
 425                         painter.setBrush(background)
 426                         painter.drawPie(innerRect, 0, 360 * 16)
 427
 428                         if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 429                                 pass
 430                         elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 431                                 painter.setPen(QtGui.QPen(dark, 1))
 432                                 painter.setBrush(QtCore.Qt.NoBrush)
 433                                 painter.drawEllipse(adjustmentRect)
 434                         else:
 435                                 raise NotImplementedError(self.DEFAULT_SHAPE)
 436
 437         def _paint_center_foreground(self, painter, adjustmentRect, selectionIndex):
 438                 centerPos = adjustmentRect.center()
 439                 pieX = centerPos.x()
 440                 pieY = centerPos.y()
 441
 442                 x = pieX
 443                 y = pieY
 444
 445                 self._paint_label(
 446                         painter,
 447                         self._filing.center().action(),
 448                         selectionIndex == PieFiling.SELECTION_CENTER,
 449                         x, y
 450                 )
 451
 452
 453 class QPieDisplay(QtGui.QWidget):
 454
 455         def __init__(self, filing, parent = None, flags = QtCore.Qt.Window):
 456                 QtGui.QWidget.__init__(self, parent, flags)
 457                 self._filing = filing
 458                 self._artist = PieArtist(self._filing)
 459                 self._selectionIndex = PieFiling.SELECTION_NONE
 460
 461         def popup(self, pos):
 462                 self._update_selection(pos)
 463                 self.show()
 464
 465         def sizeHint(self):
 466                 return self._artist.pieSize()
 467
 468         @misc_utils.log_exception(_moduleLogger)
 469         def showEvent(self, showEvent):
 470                 mask = self._artist.show(self.palette())
 471                 self.setMask(mask)
 472
 473                 QtGui.QWidget.showEvent(self, showEvent)
 474
 475         @misc_utils.log_exception(_moduleLogger)
 476         def hideEvent(self, hideEvent):
 477                 self._artist.hide()
 478                 self._selectionIndex = PieFiling.SELECTION_NONE
 479                 QtGui.QWidget.hideEvent(self, hideEvent)
 480
 481         @misc_utils.log_exception(_moduleLogger)
 482         def paintEvent(self, paintEvent):
 483                 canvas = self._artist.paint(self._selectionIndex)
 484                 offset = (self.size() - canvas.size()) / 2
 485
 486                 screen = QtGui.QPainter(self)
 487                 screen.drawPixmap(QtCore.QPoint(offset.width(), offset.height()), canvas)
 488
 489                 QtGui.QWidget.paintEvent(self, paintEvent)
 490
 491         def selectAt(self, index):
 492                 oldIndex = self._selectionIndex
 493                 self._selectionIndex = index
 494                 if self.isVisible():
 495                         self.update()
 496
 497
 498 class QPieButton(QtGui.QWidget):
 499
 500         activated = qt_compat.Signal(int)
 501         highlighted = qt_compat.Signal(int)
 502         canceled = qt_compat.Signal()
 503         aboutToShow = qt_compat.Signal()
 504         aboutToHide = qt_compat.Signal()
 505
 506         BUTTON_RADIUS = 24
 507         DELAY = 250
 508
 509         def __init__(self, buttonSlice, parent = None, buttonSlices = None):
 510                 # @bug Artifacts on Maemo 5 due to window 3D effects, find way to disable them for just these?
 511                 # @bug The pie's are being pushed back on screen on Maemo, leading to coordinate issues
 512                 QtGui.QWidget.__init__(self, parent)
 513                 self._cachedCenterPosition = self.rect().center()
 514
 515                 self._filing = PieFiling()
 516                 self._display = QPieDisplay(self._filing, None, QtCore.Qt.SplashScreen)
 517                 self._selectionIndex = PieFiling.SELECTION_NONE
 518
 519                 self._buttonFiling = PieFiling()
 520                 self._buttonFiling.set_center(buttonSlice)
 521                 if buttonSlices is not None:
 522                         for slice in buttonSlices:
 523                                 self._buttonFiling.insertItem(slice)
 524                 self._buttonFiling.setOuterRadius(self.BUTTON_RADIUS)
 525                 self._buttonArtist = PieArtist(self._buttonFiling, PieArtist.BACKGROUND_NOFILL)
 526                 self._poppedUp = False
 527                 self._pressed = False
 528
 529                 self._delayPopupTimer = QtCore.QTimer()
 530                 self._delayPopupTimer.setInterval(self.DELAY)
 531                 self._delayPopupTimer.setSingleShot(True)
 532                 self._delayPopupTimer.timeout.connect(self._on_delayed_popup)
 533                 self._popupLocation = None
 534
 535                 self._mousePosition = None
 536                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 537                 self.setSizePolicy(
 538                         QtGui.QSizePolicy(
 539                                 QtGui.QSizePolicy.MinimumExpanding,
 540                                 QtGui.QSizePolicy.MinimumExpanding,
 541                         )
 542                 )
 543
 544         def insertItem(self, item, index = -1):
 545                 self._filing.insertItem(item, index)
 546
 547         def removeItemAt(self, index):
 548                 self._filing.removeItemAt(index)
 549
 550         def set_center(self, item):
 551                 self._filing.set_center(item)
 552
 553         def set_button(self, item):
 554                 self.update()
 555
 556         def clear(self):
 557                 self._filing.clear()
 558
 559         def itemAt(self, index):
 560                 return self._filing.itemAt(index)
 561
 562         def indexAt(self, point):
 563                 return self._filing.indexAt(self._cachedCenterPosition, point)
 564
 565         def innerRadius(self):
 566                 return self._filing.innerRadius()
 567
 568         def setInnerRadius(self, radius):
 569                 self._filing.setInnerRadius(radius)
 570
 571         def outerRadius(self):
 572                 return self._filing.outerRadius()
 573
 574         def setOuterRadius(self, radius):
 575                 self._filing.setOuterRadius(radius)
 576
 577         def buttonRadius(self):
 578                 return self._buttonFiling.outerRadius()
 579
 580         def setButtonRadius(self, radius):
 581                 self._buttonFiling.setOuterRadius(radius)
 582                 self._buttonFiling.setInnerRadius(radius / 2)
 583                 self._buttonArtist.show(self.palette())
 584
 585         def minimumSizeHint(self):
 586                 return self._buttonArtist.centerSize()
 587
 588         @misc_utils.log_exception(_moduleLogger)
 589         def mousePressEvent(self, mouseEvent):
 590                 lastSelection = self._selectionIndex
 591
 592                 lastMousePos = mouseEvent.pos()
 593                 self._mousePosition = lastMousePos
 594                 self._update_selection(self._cachedCenterPosition)
 595
 596                 self.highlighted.emit(self._selectionIndex)
 597
 598                 self._display.selectAt(self._selectionIndex)
 599                 self._pressed = True
 600                 self.update()
 601                 self._popupLocation = mouseEvent.globalPos()
 602                 self._delayPopupTimer.start()
 603
 604         @misc_utils.log_exception(_moduleLogger)
 605         def _on_delayed_popup(self):
 606                 assert self._popupLocation is not None, "Widget location abuse"
 607                 self._popup_child(self._popupLocation)
 608
 609         @misc_utils.log_exception(_moduleLogger)
 610         def mouseMoveEvent(self, mouseEvent):
 611                 lastSelection = self._selectionIndex
 612
 613                 lastMousePos = mouseEvent.pos()
 614                 if self._mousePosition is None:
 615                         # Absolute
 616                         self._update_selection(lastMousePos)
 617                 else:
 618                         # Relative
 619                         self._update_selection(
 620                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 621                                 ignoreOuter = True,
 622                         )
 623
 624                 if lastSelection != self._selectionIndex:
 625                         self.highlighted.emit(self._selectionIndex)
 626                         self._display.selectAt(self._selectionIndex)
 627
 628                 if self._selectionIndex != PieFiling.SELECTION_CENTER and self._delayPopupTimer.isActive():
 629                         self._on_delayed_popup()
 630
 631         @misc_utils.log_exception(_moduleLogger)
 632         def mouseReleaseEvent(self, mouseEvent):
 633                 self._delayPopupTimer.stop()
 634                 self._popupLocation = None
 635
 636                 lastSelection = self._selectionIndex
 637
 638                 lastMousePos = mouseEvent.pos()
 639                 if self._mousePosition is None:
 640                         # Absolute
 641                         self._update_selection(lastMousePos)
 642                 else:
 643                         # Relative
 644                         self._update_selection(
 645                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 646                                 ignoreOuter = True,
 647                         )
 648                 self._mousePosition = None
 649
 650                 self._activate_at(self._selectionIndex)
 651                 self._pressed = False
 652                 self.update()
 653                 self._hide_child()
 654
 655         @misc_utils.log_exception(_moduleLogger)
 656         def keyPressEvent(self, keyEvent):
 657                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 658                         self._popup_child(QtGui.QCursor.pos())
 659                         if self._selectionIndex != len(self._filing) - 1:
 660                                 nextSelection = self._selectionIndex + 1
 661                         else:
 662                                 nextSelection = 0
 663                         self._select_at(nextSelection)
 664                         self._display.selectAt(self._selectionIndex)
 665                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 666                         self._popup_child(QtGui.QCursor.pos())
 667                         if 0 < self._selectionIndex:
 668                                 nextSelection = self._selectionIndex - 1
 669                         else:
 670                                 nextSelection = len(self._filing) - 1
 671                         self._select_at(nextSelection)
 672                         self._display.selectAt(self._selectionIndex)
 673                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 674                         self._popup_child(QtGui.QCursor.pos())
 675                         self._select_at(PieFiling.SELECTION_CENTER)
 676                         self._display.selectAt(self._selectionIndex)
 677                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 678                         self._delayPopupTimer.stop()
 679                         self._popupLocation = None
 680                         self._activate_at(self._selectionIndex)
 681                         self._hide_child()
 682                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 683                         self._delayPopupTimer.stop()
 684                         self._popupLocation = None
 685                         self._activate_at(PieFiling.SELECTION_NONE)
 686                         self._hide_child()
 687                 else:
 688                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 689
 690         @misc_utils.log_exception(_moduleLogger)
 691         def resizeEvent(self, resizeEvent):
 692                 self.setButtonRadius(min(resizeEvent.size().width(), resizeEvent.size().height()) / 2 - 1)
 693                 QtGui.QWidget.resizeEvent(self, resizeEvent)
 694
 695         @misc_utils.log_exception(_moduleLogger)
 696         def showEvent(self, showEvent):
 697                 self._buttonArtist.show(self.palette())
 698                 self._cachedCenterPosition = self.rect().center()
 699
 700                 QtGui.QWidget.showEvent(self, showEvent)
 701
 702         @misc_utils.log_exception(_moduleLogger)
 703         def hideEvent(self, hideEvent):
 704                 self._display.hide()
 705                 self._select_at(PieFiling.SELECTION_NONE)
 706                 QtGui.QWidget.hideEvent(self, hideEvent)
 707
 708         @misc_utils.log_exception(_moduleLogger)
 709         def paintEvent(self, paintEvent):
 710                 self.setButtonRadius(min(self.rect().width(), self.rect().height()) / 2 - 1)
 711                 if self._poppedUp:
 712                         selectionIndex = PieFiling.SELECTION_CENTER
 713                 else:
 714                         selectionIndex = PieFiling.SELECTION_NONE
 715
 716                 screen = QtGui.QStylePainter(self)
 717                 screen.setRenderHint(QtGui.QPainter.Antialiasing, True)
 718                 option = QtGui.QStyleOptionButton()
 719                 option.initFrom(self)
 720                 option.state = QtGui.QStyle.State_Sunken if self._pressed else QtGui.QStyle.State_Raised
 721
 722                 screen.drawControl(QtGui.QStyle.CE_PushButton, option)
 723                 self._buttonArtist.paintPainter(selectionIndex, screen)
 724
 725                 QtGui.QWidget.paintEvent(self, paintEvent)
 726
 727         def __iter__(self):
 728                 return iter(self._filing)
 729
 730         def __len__(self):
 731                 return len(self._filing)
 732
 733         def _popup_child(self, position):
 734                 self._poppedUp = True
 735                 self.aboutToShow.emit()
 736
 737                 self._delayPopupTimer.stop()
 738                 self._popupLocation = None
 739
 740                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 741                 self._display.move(position)
 742                 self._display.show()
 743
 744                 self.update()
 745
 746         def _hide_child(self):
 747                 self._poppedUp = False
 748                 self.aboutToHide.emit()
 749                 self._display.hide()
 750                 self.update()
 751
 752         def _select_at(self, index):
 753                 self._selectionIndex = index
 754
 755         def _update_selection(self, lastMousePos, ignoreOuter = False):
 756                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 757                 if radius < self._filing.innerRadius():
 758                         self._select_at(PieFiling.SELECTION_CENTER)
 759                 elif radius <= self._filing.outerRadius() or ignoreOuter:
 760                         self._select_at(self.indexAt(lastMousePos))
 761                 else:
 762                         self._select_at(PieFiling.SELECTION_NONE)
 763
 764         def _activate_at(self, index):
 765                 if index == PieFiling.SELECTION_NONE:
 766                         self.canceled.emit()
 767                         return
 768                 elif index == PieFiling.SELECTION_CENTER:
 769                         child = self._filing.center()
 770                 else:
 771                         child = self.itemAt(index)
 772
 773                 if child.action().isEnabled():
 774                         child.action().trigger()
 775                         self.activated.emit(index)
 776                 else:
 777                         self.canceled.emit()
 778
 779
 780 class QPieMenu(QtGui.QWidget):
 781
 782         activated = qt_compat.Signal(int)
 783         highlighted = qt_compat.Signal(int)
 784         canceled = qt_compat.Signal()
 785         aboutToShow = qt_compat.Signal()
 786         aboutToHide = qt_compat.Signal()
 787
 788         def __init__(self, parent = None):
 789                 QtGui.QWidget.__init__(self, parent)
 790                 self._cachedCenterPosition = self.rect().center()
 791
 792                 self._filing = PieFiling()
 793                 self._artist = PieArtist(self._filing)
 794                 self._selectionIndex = PieFiling.SELECTION_NONE
 795
 796                 self._mousePosition = ()
 797                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 798
 799         def popup(self, pos):
 800                 self._update_selection(pos)
 801                 self.show()
 802
 803         def insertItem(self, item, index = -1):
 804                 self._filing.insertItem(item, index)
 805                 self.update()
 806
 807         def removeItemAt(self, index):
 808                 self._filing.removeItemAt(index)
 809                 self.update()
 810
 811         def set_center(self, item):
 812                 self._filing.set_center(item)
 813                 self.update()
 814
 815         def clear(self):
 816                 self._filing.clear()
 817                 self.update()
 818
 819         def itemAt(self, index):
 820                 return self._filing.itemAt(index)
 821
 822         def indexAt(self, point):
 823                 return self._filing.indexAt(self._cachedCenterPosition, point)
 824
 825         def innerRadius(self):
 826                 return self._filing.innerRadius()
 827
 828         def setInnerRadius(self, radius):
 829                 self._filing.setInnerRadius(radius)
 830                 self.update()
 831
 832         def outerRadius(self):
 833                 return self._filing.outerRadius()
 834
 835         def setOuterRadius(self, radius):
 836                 self._filing.setOuterRadius(radius)
 837                 self.update()
 838
 839         def sizeHint(self):
 840                 return self._artist.pieSize()
 841
 842         @misc_utils.log_exception(_moduleLogger)
 843         def mousePressEvent(self, mouseEvent):
 844                 lastSelection = self._selectionIndex
 845
 846                 lastMousePos = mouseEvent.pos()
 847                 self._update_selection(lastMousePos)
 848                 self._mousePosition = 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 mouseMoveEvent(self, mouseEvent):
 856                 lastSelection = self._selectionIndex
 857
 858                 lastMousePos = mouseEvent.pos()
 859                 self._update_selection(lastMousePos)
 860
 861                 if lastSelection != self._selectionIndex:
 862                         self.highlighted.emit(self._selectionIndex)
 863                         self.update()
 864
 865         @misc_utils.log_exception(_moduleLogger)
 866         def mouseReleaseEvent(self, mouseEvent):
 867                 lastSelection = self._selectionIndex
 868
 869                 lastMousePos = mouseEvent.pos()
 870                 self._update_selection(lastMousePos)
 871                 self._mousePosition = ()
 872
 873                 self._activate_at(self._selectionIndex)
 874                 self.update()
 875
 876         @misc_utils.log_exception(_moduleLogger)
 877         def keyPressEvent(self, keyEvent):
 878                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 879                         if self._selectionIndex != len(self._filing) - 1:
 880                                 nextSelection = self._selectionIndex + 1
 881                         else:
 882                                 nextSelection = 0
 883                         self._select_at(nextSelection)
 884                         self.update()
 885                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 886                         if 0 < self._selectionIndex:
 887                                 nextSelection = self._selectionIndex - 1
 888                         else:
 889                                 nextSelection = len(self._filing) - 1
 890                         self._select_at(nextSelection)
 891                         self.update()
 892                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 893                         self._activate_at(self._selectionIndex)
 894                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 895                         self._activate_at(PieFiling.SELECTION_NONE)
 896                 else:
 897                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 898
 899         @misc_utils.log_exception(_moduleLogger)
 900         def showEvent(self, showEvent):
 901                 self.aboutToShow.emit()
 902                 self._cachedCenterPosition = self.rect().center()
 903
 904                 mask = self._artist.show(self.palette())
 905                 self.setMask(mask)
 906
 907                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 908                 self._update_selection(lastMousePos)
 909
 910                 QtGui.QWidget.showEvent(self, showEvent)
 911
 912         @misc_utils.log_exception(_moduleLogger)
 913         def hideEvent(self, hideEvent):
 914                 self._artist.hide()
 915                 self._selectionIndex = PieFiling.SELECTION_NONE
 916                 QtGui.QWidget.hideEvent(self, hideEvent)
 917
 918         @misc_utils.log_exception(_moduleLogger)
 919         def paintEvent(self, paintEvent):
 920                 canvas = self._artist.paint(self._selectionIndex)
 921
 922                 screen = QtGui.QPainter(self)
 923                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 924
 925                 QtGui.QWidget.paintEvent(self, paintEvent)
 926
 927         def __iter__(self):
 928                 return iter(self._filing)
 929
 930         def __len__(self):
 931                 return len(self._filing)
 932
 933         def _select_at(self, index):
 934                 self._selectionIndex = index
 935
 936         def _update_selection(self, lastMousePos):
 937                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 938                 if radius < self._filing.innerRadius():
 939                         self._selectionIndex = PieFiling.SELECTION_CENTER
 940                 elif radius <= self._filing.outerRadius():
 941                         self._select_at(self.indexAt(lastMousePos))
 942                 else:
 943                         self._selectionIndex = PieFiling.SELECTION_NONE
 944
 945         def _activate_at(self, index):
 946                 if index == PieFiling.SELECTION_NONE:
 947                         self.canceled.emit()
 948                         self.aboutToHide.emit()
 949                         self.hide()
 950                         return
 951                 elif index == PieFiling.SELECTION_CENTER:
 952                         child = self._filing.center()
 953                 else:
 954                         child = self.itemAt(index)
 955
 956                 if child.isEnabled():
 957                         child.action().trigger()
 958                         self.activated.emit(index)
 959                 else:
 960                         self.canceled.emit()
 961                 self.aboutToHide.emit()
 962                 self.hide()
 963
 964
 965 def init_pies():
 966         PieFiling.NULL_CENTER.setEnabled(False)
 967
 968
 969 def _print(msg):
 970         print msg
 971
 972
 973 def _on_about_to_hide(app):
 974         app.exit()
 975
 976
 977 if __name__ == "__main__":
 978         app = QtGui.QApplication([])
 979         init_pies()
 980
 981         if False:
 982                 pie = QPieMenu()
 983                 pie.show()
 984
 985         if False:
 986                 singleAction = QtGui.QAction(None)
 987                 singleAction.setText("Boo")
 988                 singleItem = QActionPieItem(singleAction)
 989                 spie = QPieMenu()
 990                 spie.insertItem(singleItem)
 991                 spie.show()
 992
 993         if False:
 994                 oneAction = QtGui.QAction(None)
 995                 oneAction.setText("Chew")
 996                 oneItem = QActionPieItem(oneAction)
 997                 twoAction = QtGui.QAction(None)
 998                 twoAction.setText("Foo")
 999                 twoItem = QActionPieItem(twoAction)
1000                 iconTextAction = QtGui.QAction(None)
1001                 iconTextAction.setText("Icon")
1002                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1003                 iconTextItem = QActionPieItem(iconTextAction)
1004                 mpie = QPieMenu()
1005                 mpie.insertItem(oneItem)
1006                 mpie.insertItem(twoItem)
1007                 mpie.insertItem(oneItem)
1008                 mpie.insertItem(iconTextItem)
1009                 mpie.show()
1010
1011         if True:
1012                 oneAction = QtGui.QAction(None)
1013                 oneAction.setText("Chew")
1014                 oneAction.triggered.connect(lambda: _print("Chew"))
1015                 oneItem = QActionPieItem(oneAction)
1016                 twoAction = QtGui.QAction(None)
1017                 twoAction.setText("Foo")
1018                 twoAction.triggered.connect(lambda: _print("Foo"))
1019                 twoItem = QActionPieItem(twoAction)
1020                 iconAction = QtGui.QAction(None)
1021                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1022                 iconAction.triggered.connect(lambda: _print("Icon"))
1023                 iconItem = QActionPieItem(iconAction)
1024                 iconTextAction = QtGui.QAction(None)
1025                 iconTextAction.setText("Icon")
1026                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1027                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1028                 iconTextItem = QActionPieItem(iconTextAction)
1029                 mpie = QPieMenu()
1030                 mpie.set_center(iconItem)
1031                 mpie.insertItem(oneItem)
1032                 mpie.insertItem(twoItem)
1033                 mpie.insertItem(oneItem)
1034                 mpie.insertItem(iconTextItem)
1035                 mpie.show()
1036                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1037                 mpie.canceled.connect(lambda: _print("Canceled"))
1038
1039         if False:
1040                 oneAction = QtGui.QAction(None)
1041                 oneAction.setText("Chew")
1042                 oneAction.triggered.connect(lambda: _print("Chew"))
1043                 oneItem = QActionPieItem(oneAction)
1044                 twoAction = QtGui.QAction(None)
1045                 twoAction.setText("Foo")
1046                 twoAction.triggered.connect(lambda: _print("Foo"))
1047                 twoItem = QActionPieItem(twoAction)
1048                 iconAction = QtGui.QAction(None)
1049                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1050                 iconAction.triggered.connect(lambda: _print("Icon"))
1051                 iconItem = QActionPieItem(iconAction)
1052                 iconTextAction = QtGui.QAction(None)
1053                 iconTextAction.setText("Icon")
1054                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1055                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1056                 iconTextItem = QActionPieItem(iconTextAction)
1057                 pieFiling = PieFiling()
1058                 pieFiling.set_center(iconItem)
1059                 pieFiling.insertItem(oneItem)
1060                 pieFiling.insertItem(twoItem)
1061                 pieFiling.insertItem(oneItem)
1062                 pieFiling.insertItem(iconTextItem)
1063                 mpie = QPieDisplay(pieFiling)
1064                 mpie.show()
1065
1066         if False:
1067                 oneAction = QtGui.QAction(None)
1068                 oneAction.setText("Chew")
1069                 oneAction.triggered.connect(lambda: _print("Chew"))
1070                 oneItem = QActionPieItem(oneAction)
1071                 twoAction = QtGui.QAction(None)
1072                 twoAction.setText("Foo")
1073                 twoAction.triggered.connect(lambda: _print("Foo"))
1074                 twoItem = QActionPieItem(twoAction)
1075                 iconAction = QtGui.QAction(None)
1076                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1077                 iconAction.triggered.connect(lambda: _print("Icon"))
1078                 iconItem = QActionPieItem(iconAction)
1079                 iconTextAction = QtGui.QAction(None)
1080                 iconTextAction.setText("Icon")
1081                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1082                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1083                 iconTextItem = QActionPieItem(iconTextAction)
1084                 mpie = QPieButton(iconItem)
1085                 mpie.set_center(iconItem)
1086                 mpie.insertItem(oneItem)
1087                 mpie.insertItem(twoItem)
1088                 mpie.insertItem(oneItem)
1089                 mpie.insertItem(iconTextItem)
1090                 mpie.show()
1091                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1092                 mpie.canceled.connect(lambda: _print("Canceled"))
1093
1094         app.exec_()