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):
 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                 self._buttonFiling.setOuterRadius(self.BUTTON_RADIUS)
 518                 self._buttonArtist = PieArtist(self._buttonFiling)
 519                 self._poppedUp = False
 520
 521                 self._delayPopupTimer = QtCore.QTimer()
 522                 self._delayPopupTimer.setInterval(self.DELAY)
 523                 self._delayPopupTimer.setSingleShot(True)
 524                 self._delayPopupTimer.timeout.connect(self._on_delayed_popup)
 525                 self._popupLocation = None
 526
 527                 self._mousePosition = None
 528                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 529
 530         def insertItem(self, item, index = -1):
 531                 self._filing.insertItem(item, index)
 532
 533         def removeItemAt(self, index):
 534                 self._filing.removeItemAt(index)
 535
 536         def set_center(self, item):
 537                 self._filing.set_center(item)
 538
 539         def set_button(self, item):
 540                 self.update()
 541
 542         def clear(self):
 543                 self._filing.clear()
 544
 545         def itemAt(self, index):
 546                 return self._filing.itemAt(index)
 547
 548         def indexAt(self, point):
 549                 return self._filing.indexAt(self._cachedCenterPosition, point)
 550
 551         def innerRadius(self):
 552                 return self._filing.innerRadius()
 553
 554         def setInnerRadius(self, radius):
 555                 self._filing.setInnerRadius(radius)
 556
 557         def outerRadius(self):
 558                 return self._filing.outerRadius()
 559
 560         def setOuterRadius(self, radius):
 561                 self._filing.setOuterRadius(radius)
 562
 563         def buttonRadius(self):
 564                 return self._buttonFiling.outerRadius()
 565
 566         def setButtonRadius(self, radius):
 567                 self._buttonFiling.setOuterRadius(radius)
 568                 self._buttonArtist.show(self.palette())
 569
 570         def minimumSizeHint(self):
 571                 return self._buttonArtist.centerSize()
 572
 573         @misc_utils.log_exception(_moduleLogger)
 574         def mousePressEvent(self, mouseEvent):
 575                 lastSelection = self._selectionIndex
 576
 577                 lastMousePos = mouseEvent.pos()
 578                 self._mousePosition = lastMousePos
 579                 self._update_selection(self._cachedCenterPosition)
 580
 581                 self.highlighted.emit(self._selectionIndex)
 582
 583                 self._display.selectAt(self._selectionIndex)
 584                 self._popupLocation = mouseEvent.globalPos()
 585                 self._delayPopupTimer.start()
 586
 587         @misc_utils.log_exception(_moduleLogger)
 588         def _on_delayed_popup(self):
 589                 assert self._popupLocation is not None
 590                 self._popup_child(self._popupLocation)
 591
 592         @misc_utils.log_exception(_moduleLogger)
 593         def mouseMoveEvent(self, mouseEvent):
 594                 lastSelection = self._selectionIndex
 595
 596                 lastMousePos = mouseEvent.pos()
 597                 if self._mousePosition is None:
 598                         # Absolute
 599                         self._update_selection(lastMousePos)
 600                 else:
 601                         # Relative
 602                         self._update_selection(
 603                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 604                                 ignoreOuter = True,
 605                         )
 606
 607                 if lastSelection != self._selectionIndex:
 608                         self.highlighted.emit(self._selectionIndex)
 609                         self._display.selectAt(self._selectionIndex)
 610
 611                 if self._selectionIndex != PieFiling.SELECTION_CENTER and self._delayPopupTimer.isActive():
 612                         self._on_delayed_popup()
 613
 614         @misc_utils.log_exception(_moduleLogger)
 615         def mouseReleaseEvent(self, mouseEvent):
 616                 self._delayPopupTimer.stop()
 617                 self._popupLocation = None
 618
 619                 lastSelection = self._selectionIndex
 620
 621                 lastMousePos = mouseEvent.pos()
 622                 if self._mousePosition is None:
 623                         # Absolute
 624                         self._update_selection(lastMousePos)
 625                 else:
 626                         # Relative
 627                         self._update_selection(
 628                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 629                                 ignoreOuter = True,
 630                         )
 631                 self._mousePosition = None
 632
 633                 self._activate_at(self._selectionIndex)
 634                 self._hide_child()
 635
 636         @misc_utils.log_exception(_moduleLogger)
 637         def keyPressEvent(self, keyEvent):
 638                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 639                         self._popup_child(QtGui.QCursor.pos())
 640                         if self._selectionIndex != len(self._filing) - 1:
 641                                 nextSelection = self._selectionIndex + 1
 642                         else:
 643                                 nextSelection = 0
 644                         self._select_at(nextSelection)
 645                         self._display.selectAt(self._selectionIndex)
 646                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 647                         self._popup_child(QtGui.QCursor.pos())
 648                         if 0 < self._selectionIndex:
 649                                 nextSelection = self._selectionIndex - 1
 650                         else:
 651                                 nextSelection = len(self._filing) - 1
 652                         self._select_at(nextSelection)
 653                         self._display.selectAt(self._selectionIndex)
 654                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 655                         self._popup_child(QtGui.QCursor.pos())
 656                         self._select_at(PieFiling.SELECTION_CENTER)
 657                         self._display.selectAt(self._selectionIndex)
 658                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 659                         self._delayPopupTimer.stop()
 660                         self._popupLocation = None
 661                         self._activate_at(self._selectionIndex)
 662                         self._hide_child()
 663                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 664                         self._delayPopupTimer.stop()
 665                         self._popupLocation = None
 666                         self._activate_at(PieFiling.SELECTION_NONE)
 667                         self._hide_child()
 668                 else:
 669                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 670
 671         @misc_utils.log_exception(_moduleLogger)
 672         def resizeEvent(self, resizeEvent):
 673                 self.setButtonRadius(min(resizeEvent.size().width(), resizeEvent.size().height()) / 2 - 1)
 674                 QtGui.QWidget.resizeEvent(self, resizeEvent)
 675
 676         @misc_utils.log_exception(_moduleLogger)
 677         def showEvent(self, showEvent):
 678                 self._buttonArtist.show(self.palette())
 679                 self._cachedCenterPosition = self.rect().center()
 680
 681                 QtGui.QWidget.showEvent(self, showEvent)
 682
 683         @misc_utils.log_exception(_moduleLogger)
 684         def hideEvent(self, hideEvent):
 685                 self._display.hide()
 686                 self._select_at(PieFiling.SELECTION_NONE)
 687                 QtGui.QWidget.hideEvent(self, hideEvent)
 688
 689         @misc_utils.log_exception(_moduleLogger)
 690         def paintEvent(self, paintEvent):
 691                 self.setButtonRadius(min(self.rect().width(), self.rect().height()) / 2 - 1)
 692                 if self._poppedUp:
 693                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_CENTER)
 694                 else:
 695                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_NONE)
 696
 697                 screen = QtGui.QPainter(self)
 698                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 699
 700                 QtGui.QWidget.paintEvent(self, paintEvent)
 701
 702         def __iter__(self):
 703                 return iter(self._filing)
 704
 705         def __len__(self):
 706                 return len(self._filing)
 707
 708         def _popup_child(self, position):
 709                 self._poppedUp = True
 710                 self.aboutToShow.emit()
 711
 712                 self._delayPopupTimer.stop()
 713                 self._popupLocation = None
 714
 715                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 716                 self._display.move(position)
 717                 self._display.show()
 718
 719                 self.update()
 720
 721         def _hide_child(self):
 722                 self._poppedUp = False
 723                 self.aboutToHide.emit()
 724                 self._display.hide()
 725                 self.update()
 726
 727         def _select_at(self, index):
 728                 self._selectionIndex = index
 729
 730         def _update_selection(self, lastMousePos, ignoreOuter = False):
 731                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 732                 if radius < self._filing.innerRadius():
 733                         self._select_at(PieFiling.SELECTION_CENTER)
 734                 elif radius <= self._filing.outerRadius() or ignoreOuter:
 735                         self._select_at(self.indexAt(lastMousePos))
 736                 else:
 737                         self._select_at(PieFiling.SELECTION_NONE)
 738
 739         def _activate_at(self, index):
 740                 if index == PieFiling.SELECTION_NONE:
 741                         self.canceled.emit()
 742                         return
 743                 elif index == PieFiling.SELECTION_CENTER:
 744                         child = self._filing.center()
 745                 else:
 746                         child = self.itemAt(index)
 747
 748                 if child.action().isEnabled():
 749                         child.action().trigger()
 750                         self.activated.emit(index)
 751                 else:
 752                         self.canceled.emit()
 753
 754
 755 class QPieMenu(QtGui.QWidget):
 756
 757         activated = QtCore.pyqtSignal(int)
 758         highlighted = QtCore.pyqtSignal(int)
 759         canceled = QtCore.pyqtSignal()
 760         aboutToShow = QtCore.pyqtSignal()
 761         aboutToHide = QtCore.pyqtSignal()
 762
 763         def __init__(self, parent = None):
 764                 QtGui.QWidget.__init__(self, parent)
 765                 self._cachedCenterPosition = self.rect().center()
 766
 767                 self._filing = PieFiling()
 768                 self._artist = PieArtist(self._filing)
 769                 self._selectionIndex = PieFiling.SELECTION_NONE
 770
 771                 self._mousePosition = ()
 772                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 773
 774         def popup(self, pos):
 775                 self._update_selection(pos)
 776                 self.show()
 777
 778         def insertItem(self, item, index = -1):
 779                 self._filing.insertItem(item, index)
 780                 self.update()
 781
 782         def removeItemAt(self, index):
 783                 self._filing.removeItemAt(index)
 784                 self.update()
 785
 786         def set_center(self, item):
 787                 self._filing.set_center(item)
 788                 self.update()
 789
 790         def clear(self):
 791                 self._filing.clear()
 792                 self.update()
 793
 794         def itemAt(self, index):
 795                 return self._filing.itemAt(index)
 796
 797         def indexAt(self, point):
 798                 return self._filing.indexAt(self._cachedCenterPosition, point)
 799
 800         def innerRadius(self):
 801                 return self._filing.innerRadius()
 802
 803         def setInnerRadius(self, radius):
 804                 self._filing.setInnerRadius(radius)
 805                 self.update()
 806
 807         def outerRadius(self):
 808                 return self._filing.outerRadius()
 809
 810         def setOuterRadius(self, radius):
 811                 self._filing.setOuterRadius(radius)
 812                 self.update()
 813
 814         def sizeHint(self):
 815                 return self._artist.pieSize()
 816
 817         @misc_utils.log_exception(_moduleLogger)
 818         def mousePressEvent(self, mouseEvent):
 819                 lastSelection = self._selectionIndex
 820
 821                 lastMousePos = mouseEvent.pos()
 822                 self._update_selection(lastMousePos)
 823                 self._mousePosition = lastMousePos
 824
 825                 if lastSelection != self._selectionIndex:
 826                         self.highlighted.emit(self._selectionIndex)
 827                         self.update()
 828
 829         @misc_utils.log_exception(_moduleLogger)
 830         def mouseMoveEvent(self, mouseEvent):
 831                 lastSelection = self._selectionIndex
 832
 833                 lastMousePos = mouseEvent.pos()
 834                 self._update_selection(lastMousePos)
 835
 836                 if lastSelection != self._selectionIndex:
 837                         self.highlighted.emit(self._selectionIndex)
 838                         self.update()
 839
 840         @misc_utils.log_exception(_moduleLogger)
 841         def mouseReleaseEvent(self, mouseEvent):
 842                 lastSelection = self._selectionIndex
 843
 844                 lastMousePos = mouseEvent.pos()
 845                 self._update_selection(lastMousePos)
 846                 self._mousePosition = ()
 847
 848                 self._activate_at(self._selectionIndex)
 849                 self.update()
 850
 851         @misc_utils.log_exception(_moduleLogger)
 852         def keyPressEvent(self, keyEvent):
 853                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 854                         if self._selectionIndex != len(self._filing) - 1:
 855                                 nextSelection = self._selectionIndex + 1
 856                         else:
 857                                 nextSelection = 0
 858                         self._select_at(nextSelection)
 859                         self.update()
 860                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 861                         if 0 < self._selectionIndex:
 862                                 nextSelection = self._selectionIndex - 1
 863                         else:
 864                                 nextSelection = len(self._filing) - 1
 865                         self._select_at(nextSelection)
 866                         self.update()
 867                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 868                         self._activate_at(self._selectionIndex)
 869                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 870                         self._activate_at(PieFiling.SELECTION_NONE)
 871                 else:
 872                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 873
 874         @misc_utils.log_exception(_moduleLogger)
 875         def showEvent(self, showEvent):
 876                 self.aboutToShow.emit()
 877                 self._cachedCenterPosition = self.rect().center()
 878
 879                 mask = self._artist.show(self.palette())
 880                 self.setMask(mask)
 881
 882                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 883                 self._update_selection(lastMousePos)
 884
 885                 QtGui.QWidget.showEvent(self, showEvent)
 886
 887         @misc_utils.log_exception(_moduleLogger)
 888         def hideEvent(self, hideEvent):
 889                 self._artist.hide()
 890                 self._selectionIndex = PieFiling.SELECTION_NONE
 891                 QtGui.QWidget.hideEvent(self, hideEvent)
 892
 893         @misc_utils.log_exception(_moduleLogger)
 894         def paintEvent(self, paintEvent):
 895                 canvas = self._artist.paint(self._selectionIndex)
 896
 897                 screen = QtGui.QPainter(self)
 898                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 899
 900                 QtGui.QWidget.paintEvent(self, paintEvent)
 901
 902         def __iter__(self):
 903                 return iter(self._filing)
 904
 905         def __len__(self):
 906                 return len(self._filing)
 907
 908         def _select_at(self, index):
 909                 self._selectionIndex = index
 910
 911         def _update_selection(self, lastMousePos):
 912                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 913                 if radius < self._filing.innerRadius():
 914                         self._selectionIndex = PieFiling.SELECTION_CENTER
 915                 elif radius <= self._filing.outerRadius():
 916                         self._select_at(self.indexAt(lastMousePos))
 917                 else:
 918                         self._selectionIndex = PieFiling.SELECTION_NONE
 919
 920         def _activate_at(self, index):
 921                 if index == PieFiling.SELECTION_NONE:
 922                         self.canceled.emit()
 923                         self.aboutToHide.emit()
 924                         self.hide()
 925                         return
 926                 elif index == PieFiling.SELECTION_CENTER:
 927                         child = self._filing.center()
 928                 else:
 929                         child = self.itemAt(index)
 930
 931                 if child.isEnabled():
 932                         child.action().trigger()
 933                         self.activated.emit(index)
 934                 else:
 935                         self.canceled.emit()
 936                 self.aboutToHide.emit()
 937                 self.hide()
 938
 939
 940 def init_pies():
 941         PieFiling.NULL_CENTER.setEnabled(False)
 942
 943
 944 def _print(msg):
 945         print msg
 946
 947
 948 def _on_about_to_hide(app):
 949         app.exit()
 950
 951
 952 if __name__ == "__main__":
 953         app = QtGui.QApplication([])
 954         init_pies()
 955
 956         if False:
 957                 pie = QPieMenu()
 958                 pie.show()
 959
 960         if False:
 961                 singleAction = QtGui.QAction(None)
 962                 singleAction.setText("Boo")
 963                 singleItem = QActionPieItem(singleAction)
 964                 spie = QPieMenu()
 965                 spie.insertItem(singleItem)
 966                 spie.show()
 967
 968         if False:
 969                 oneAction = QtGui.QAction(None)
 970                 oneAction.setText("Chew")
 971                 oneItem = QActionPieItem(oneAction)
 972                 twoAction = QtGui.QAction(None)
 973                 twoAction.setText("Foo")
 974                 twoItem = QActionPieItem(twoAction)
 975                 iconTextAction = QtGui.QAction(None)
 976                 iconTextAction.setText("Icon")
 977                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 978                 iconTextItem = QActionPieItem(iconTextAction)
 979                 mpie = QPieMenu()
 980                 mpie.insertItem(oneItem)
 981                 mpie.insertItem(twoItem)
 982                 mpie.insertItem(oneItem)
 983                 mpie.insertItem(iconTextItem)
 984                 mpie.show()
 985
 986         if True:
 987                 oneAction = QtGui.QAction(None)
 988                 oneAction.setText("Chew")
 989                 oneAction.triggered.connect(lambda: _print("Chew"))
 990                 oneItem = QActionPieItem(oneAction)
 991                 twoAction = QtGui.QAction(None)
 992                 twoAction.setText("Foo")
 993                 twoAction.triggered.connect(lambda: _print("Foo"))
 994                 twoItem = QActionPieItem(twoAction)
 995                 iconAction = QtGui.QAction(None)
 996                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 997                 iconAction.triggered.connect(lambda: _print("Icon"))
 998                 iconItem = QActionPieItem(iconAction)
 999                 iconTextAction = QtGui.QAction(None)
1000                 iconTextAction.setText("Icon")
1001                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1002                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1003                 iconTextItem = QActionPieItem(iconTextAction)
1004                 mpie = QPieMenu()
1005                 mpie.set_center(iconItem)
1006                 mpie.insertItem(oneItem)
1007                 mpie.insertItem(twoItem)
1008                 mpie.insertItem(oneItem)
1009                 mpie.insertItem(iconTextItem)
1010                 mpie.show()
1011                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1012                 mpie.canceled.connect(lambda: _print("Canceled"))
1013
1014         if False:
1015                 oneAction = QtGui.QAction(None)
1016                 oneAction.setText("Chew")
1017                 oneAction.triggered.connect(lambda: _print("Chew"))
1018                 oneItem = QActionPieItem(oneAction)
1019                 twoAction = QtGui.QAction(None)
1020                 twoAction.setText("Foo")
1021                 twoAction.triggered.connect(lambda: _print("Foo"))
1022                 twoItem = QActionPieItem(twoAction)
1023                 iconAction = QtGui.QAction(None)
1024                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1025                 iconAction.triggered.connect(lambda: _print("Icon"))
1026                 iconItem = QActionPieItem(iconAction)
1027                 iconTextAction = QtGui.QAction(None)
1028                 iconTextAction.setText("Icon")
1029                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1030                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1031                 iconTextItem = QActionPieItem(iconTextAction)
1032                 pieFiling = PieFiling()
1033                 pieFiling.set_center(iconItem)
1034                 pieFiling.insertItem(oneItem)
1035                 pieFiling.insertItem(twoItem)
1036                 pieFiling.insertItem(oneItem)
1037                 pieFiling.insertItem(iconTextItem)
1038                 mpie = QPieDisplay(pieFiling)
1039                 mpie.show()
1040
1041         if False:
1042                 oneAction = QtGui.QAction(None)
1043                 oneAction.setText("Chew")
1044                 oneAction.triggered.connect(lambda: _print("Chew"))
1045                 oneItem = QActionPieItem(oneAction)
1046                 twoAction = QtGui.QAction(None)
1047                 twoAction.setText("Foo")
1048                 twoAction.triggered.connect(lambda: _print("Foo"))
1049                 twoItem = QActionPieItem(twoAction)
1050                 iconAction = QtGui.QAction(None)
1051                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1052                 iconAction.triggered.connect(lambda: _print("Icon"))
1053                 iconItem = QActionPieItem(iconAction)
1054                 iconTextAction = QtGui.QAction(None)
1055                 iconTextAction.setText("Icon")
1056                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1057                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1058                 iconTextItem = QActionPieItem(iconTextAction)
1059                 mpie = QPieButton(iconItem)
1060                 mpie.set_center(iconItem)
1061                 mpie.insertItem(oneItem)
1062                 mpie.insertItem(twoItem)
1063                 mpie.insertItem(oneItem)
1064                 mpie.insertItem(iconTextItem)
1065                 mpie.show()
1066                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1067                 mpie.canceled.connect(lambda: _print("Canceled"))
1068
1069         app.exec_()