git.maemo.org Git - ejpi/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                         painter.setPen(self.palette.highlight().color())
 316                 else:
 317                         painter.setBrush(self.palette.window())
 318                         painter.setPen(self.palette.window().color())
 319
 320                 a = self._filing._index_to_angle(i, True)
 321                 b = self._filing._index_to_angle(i + 1, True)
 322                 if b < a:
 323                         b += _TWOPI
 324                 size = b - a
 325                 if size < 0:
 326                         size += _TWOPI
 327
 328                 startAngleInDeg = (a * 360 * 16) / _TWOPI
 329                 sizeInDeg = (size * 360 * 16) / _TWOPI
 330                 painter.drawPie(adjustmentRect, int(startAngleInDeg), int(sizeInDeg))
 331
 332         def _paint_slice_foreground(self, painter, i, selectionIndex):
 333                 child = self._filing[i]
 334
 335                 a = self._filing._index_to_angle(i, True)
 336                 b = self._filing._index_to_angle(i + 1, True)
 337                 if b < a:
 338                         b += _TWOPI
 339                 middleAngle = (a + b) / 2
 340                 averageRadius = (self._cachedInnerRadius + self._cachedOuterRadius) / 2
 341
 342                 sliceX = averageRadius * math.cos(middleAngle)
 343                 sliceY = - averageRadius * math.sin(middleAngle)
 344
 345                 piePos = self._canvas.rect().center()
 346                 pieX = piePos.x()
 347                 pieY = piePos.y()
 348                 self._paint_label(
 349                         painter, child.action(), i == selectionIndex, pieX+sliceX, pieY+sliceY
 350                 )
 351
 352         def _paint_label(self, painter, action, isSelected, x, y):
 353                 text = action.text()
 354                 fontMetrics = painter.fontMetrics()
 355                 if text:
 356                         textBoundingRect = fontMetrics.boundingRect(text)
 357                 else:
 358                         textBoundingRect = QtCore.QRect()
 359                 textWidth = textBoundingRect.width()
 360                 textHeight = textBoundingRect.height()
 361
 362                 icon = action.icon().pixmap(
 363                         QtCore.QSize(self.ICON_SIZE_DEFAULT, self.ICON_SIZE_DEFAULT),
 364                         QtGui.QIcon.Normal,
 365                         QtGui.QIcon.On,
 366                 )
 367                 iconWidth = icon.width()
 368                 iconHeight = icon.width()
 369                 averageWidth = (iconWidth + textWidth)/2
 370                 if not icon.isNull():
 371                         iconRect = QtCore.QRect(
 372                                 x - averageWidth,
 373                                 y - iconHeight/2,
 374                                 iconWidth,
 375                                 iconHeight,
 376                         )
 377
 378                         painter.drawPixmap(iconRect, icon)
 379
 380                 if text:
 381                         if isSelected:
 382                                 if action.isEnabled():
 383                                         pen = self.palette.highlightedText()
 384                                         brush = self.palette.highlight()
 385                                 else:
 386                                         pen = self.palette.mid()
 387                                         brush = self.palette.window()
 388                         else:
 389                                 if action.isEnabled():
 390                                         pen = self.palette.windowText()
 391                                 else:
 392                                         pen = self.palette.mid()
 393                                 brush = self.palette.window()
 394
 395                         leftX = x - averageWidth + iconWidth
 396                         topY = y + textHeight/2
 397                         painter.setPen(pen.color())
 398                         painter.setBrush(brush)
 399                         painter.drawText(leftX, topY, text)
 400
 401         def _paint_center_background(self, painter, adjustmentRect, selectionIndex):
 402                 dark = self.palette.mid().color()
 403                 light = self.palette.light().color()
 404                 if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 405                         background = self.palette.highlight().color()
 406                 else:
 407                         background = self.palette.window().color()
 408
 409                 innerRadius = self._cachedInnerRadius
 410                 adjustmentCenterPos = adjustmentRect.center()
 411                 innerRect = QtCore.QRect(
 412                         adjustmentCenterPos.x() - innerRadius,
 413                         adjustmentCenterPos.y() - innerRadius,
 414                         innerRadius * 2 + 1,
 415                         innerRadius * 2 + 1,
 416                 )
 417
 418                 painter.setPen(QtCore.Qt.NoPen)
 419                 painter.setBrush(background)
 420                 painter.drawPie(innerRect, 0, 360 * 16)
 421
 422                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 423                         pass
 424                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 425                         painter.setPen(QtGui.QPen(dark, 1))
 426                         painter.setBrush(QtCore.Qt.NoBrush)
 427                         painter.drawEllipse(adjustmentRect)
 428                 else:
 429                         raise NotImplementedError(self.DEFAULT_SHAPE)
 430
 431         def _paint_center_foreground(self, painter, selectionIndex):
 432                 centerPos = self._canvas.rect().center()
 433                 pieX = centerPos.x()
 434                 pieY = centerPos.y()
 435
 436                 x = pieX
 437                 y = pieY
 438
 439                 self._paint_label(
 440                         painter,
 441                         self._filing.center().action(),
 442                         selectionIndex == PieFiling.SELECTION_CENTER,
 443                         x, y
 444                 )
 445
 446
 447 class QPieDisplay(QtGui.QWidget):
 448
 449         def __init__(self, filing, parent = None, flags = QtCore.Qt.Window):
 450                 QtGui.QWidget.__init__(self, parent, flags)
 451                 self._filing = filing
 452                 self._artist = PieArtist(self._filing)
 453                 self._selectionIndex = PieFiling.SELECTION_NONE
 454
 455         def popup(self, pos):
 456                 self._update_selection(pos)
 457                 self.show()
 458
 459         def sizeHint(self):
 460                 return self._artist.pieSize()
 461
 462         @misc_utils.log_exception(_moduleLogger)
 463         def showEvent(self, showEvent):
 464                 mask = self._artist.show(self.palette())
 465                 self.setMask(mask)
 466
 467                 QtGui.QWidget.showEvent(self, showEvent)
 468
 469         @misc_utils.log_exception(_moduleLogger)
 470         def hideEvent(self, hideEvent):
 471                 self._artist.hide()
 472                 self._selectionIndex = PieFiling.SELECTION_NONE
 473                 QtGui.QWidget.hideEvent(self, hideEvent)
 474
 475         @misc_utils.log_exception(_moduleLogger)
 476         def paintEvent(self, paintEvent):
 477                 canvas = self._artist.paint(self._selectionIndex)
 478                 offset = (self.size() - canvas.size()) / 2
 479
 480                 screen = QtGui.QPainter(self)
 481                 screen.drawPixmap(QtCore.QPoint(offset.width(), offset.height()), canvas)
 482
 483                 QtGui.QWidget.paintEvent(self, paintEvent)
 484
 485         def selectAt(self, index):
 486                 oldIndex = self._selectionIndex
 487                 self._selectionIndex = index
 488                 if self.isVisible():
 489                         self.update()
 490
 491
 492 class QPieButton(QtGui.QWidget):
 493
 494         activated = QtCore.pyqtSignal(int)
 495         highlighted = QtCore.pyqtSignal(int)
 496         canceled = QtCore.pyqtSignal()
 497         aboutToShow = QtCore.pyqtSignal()
 498         aboutToHide = QtCore.pyqtSignal()
 499
 500         BUTTON_RADIUS = 24
 501         DELAY = 250
 502
 503         def __init__(self, buttonSlice, parent = None, buttonSlices = None):
 504                 # @bug Artifacts on Maemo 5 due to window 3D effects, find way to disable them for just these?
 505                 # @bug The pie's are being pushed back on screen on Maemo, leading to coordinate issues
 506                 QtGui.QWidget.__init__(self, parent)
 507                 self._cachedCenterPosition = self.rect().center()
 508
 509                 self._filing = PieFiling()
 510                 self._display = QPieDisplay(self._filing, None, QtCore.Qt.SplashScreen)
 511                 self._selectionIndex = PieFiling.SELECTION_NONE
 512
 513                 self._buttonFiling = PieFiling()
 514                 self._buttonFiling.set_center(buttonSlice)
 515                 if buttonSlices is not None:
 516                         for slice in buttonSlices:
 517                                 self._buttonFiling.insertItem(slice)
 518                 self._buttonFiling.setOuterRadius(self.BUTTON_RADIUS)
 519                 self._buttonArtist = PieArtist(self._buttonFiling)
 520                 self._poppedUp = False
 521
 522                 self._delayPopupTimer = QtCore.QTimer()
 523                 self._delayPopupTimer.setInterval(self.DELAY)
 524                 self._delayPopupTimer.setSingleShot(True)
 525                 self._delayPopupTimer.timeout.connect(self._on_delayed_popup)
 526                 self._popupLocation = None
 527
 528                 self._mousePosition = None
 529                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 530                 self.setSizePolicy(
 531                         QtGui.QSizePolicy(
 532                                 QtGui.QSizePolicy.MinimumExpanding,
 533                                 QtGui.QSizePolicy.MinimumExpanding,
 534                         )
 535                 )
 536
 537         def insertItem(self, item, index = -1):
 538                 self._filing.insertItem(item, index)
 539
 540         def removeItemAt(self, index):
 541                 self._filing.removeItemAt(index)
 542
 543         def set_center(self, item):
 544                 self._filing.set_center(item)
 545
 546         def set_button(self, item):
 547                 self.update()
 548
 549         def clear(self):
 550                 self._filing.clear()
 551
 552         def itemAt(self, index):
 553                 return self._filing.itemAt(index)
 554
 555         def indexAt(self, point):
 556                 return self._filing.indexAt(self._cachedCenterPosition, point)
 557
 558         def innerRadius(self):
 559                 return self._filing.innerRadius()
 560
 561         def setInnerRadius(self, radius):
 562                 self._filing.setInnerRadius(radius)
 563
 564         def outerRadius(self):
 565                 return self._filing.outerRadius()
 566
 567         def setOuterRadius(self, radius):
 568                 self._filing.setOuterRadius(radius)
 569
 570         def buttonRadius(self):
 571                 return self._buttonFiling.outerRadius()
 572
 573         def setButtonRadius(self, radius):
 574                 self._buttonFiling.setOuterRadius(radius)
 575                 self._buttonFiling.setInnerRadius(radius / 2)
 576                 self._buttonArtist.show(self.palette())
 577
 578         def minimumSizeHint(self):
 579                 return self._buttonArtist.centerSize()
 580
 581         @misc_utils.log_exception(_moduleLogger)
 582         def mousePressEvent(self, mouseEvent):
 583                 lastSelection = self._selectionIndex
 584
 585                 lastMousePos = mouseEvent.pos()
 586                 self._mousePosition = lastMousePos
 587                 self._update_selection(self._cachedCenterPosition)
 588
 589                 self.highlighted.emit(self._selectionIndex)
 590
 591                 self._display.selectAt(self._selectionIndex)
 592                 self._popupLocation = mouseEvent.globalPos()
 593                 self._delayPopupTimer.start()
 594
 595         @misc_utils.log_exception(_moduleLogger)
 596         def _on_delayed_popup(self):
 597                 assert self._popupLocation is not None, "Widget location abuse"
 598                 self._popup_child(self._popupLocation)
 599
 600         @misc_utils.log_exception(_moduleLogger)
 601         def mouseMoveEvent(self, mouseEvent):
 602                 lastSelection = self._selectionIndex
 603
 604                 lastMousePos = mouseEvent.pos()
 605                 if self._mousePosition is None:
 606                         # Absolute
 607                         self._update_selection(lastMousePos)
 608                 else:
 609                         # Relative
 610                         self._update_selection(
 611                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 612                                 ignoreOuter = True,
 613                         )
 614
 615                 if lastSelection != self._selectionIndex:
 616                         self.highlighted.emit(self._selectionIndex)
 617                         self._display.selectAt(self._selectionIndex)
 618
 619                 if self._selectionIndex != PieFiling.SELECTION_CENTER and self._delayPopupTimer.isActive():
 620                         self._on_delayed_popup()
 621
 622         @misc_utils.log_exception(_moduleLogger)
 623         def mouseReleaseEvent(self, mouseEvent):
 624                 self._delayPopupTimer.stop()
 625                 self._popupLocation = None
 626
 627                 lastSelection = self._selectionIndex
 628
 629                 lastMousePos = mouseEvent.pos()
 630                 if self._mousePosition is None:
 631                         # Absolute
 632                         self._update_selection(lastMousePos)
 633                 else:
 634                         # Relative
 635                         self._update_selection(
 636                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 637                                 ignoreOuter = True,
 638                         )
 639                 self._mousePosition = None
 640
 641                 self._activate_at(self._selectionIndex)
 642                 self._hide_child()
 643
 644         @misc_utils.log_exception(_moduleLogger)
 645         def keyPressEvent(self, keyEvent):
 646                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 647                         self._popup_child(QtGui.QCursor.pos())
 648                         if self._selectionIndex != len(self._filing) - 1:
 649                                 nextSelection = self._selectionIndex + 1
 650                         else:
 651                                 nextSelection = 0
 652                         self._select_at(nextSelection)
 653                         self._display.selectAt(self._selectionIndex)
 654                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 655                         self._popup_child(QtGui.QCursor.pos())
 656                         if 0 < self._selectionIndex:
 657                                 nextSelection = self._selectionIndex - 1
 658                         else:
 659                                 nextSelection = len(self._filing) - 1
 660                         self._select_at(nextSelection)
 661                         self._display.selectAt(self._selectionIndex)
 662                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 663                         self._popup_child(QtGui.QCursor.pos())
 664                         self._select_at(PieFiling.SELECTION_CENTER)
 665                         self._display.selectAt(self._selectionIndex)
 666                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 667                         self._delayPopupTimer.stop()
 668                         self._popupLocation = None
 669                         self._activate_at(self._selectionIndex)
 670                         self._hide_child()
 671                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 672                         self._delayPopupTimer.stop()
 673                         self._popupLocation = None
 674                         self._activate_at(PieFiling.SELECTION_NONE)
 675                         self._hide_child()
 676                 else:
 677                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 678
 679         @misc_utils.log_exception(_moduleLogger)
 680         def resizeEvent(self, resizeEvent):
 681                 self.setButtonRadius(min(resizeEvent.size().width(), resizeEvent.size().height()) / 2 - 1)
 682                 QtGui.QWidget.resizeEvent(self, resizeEvent)
 683
 684         @misc_utils.log_exception(_moduleLogger)
 685         def showEvent(self, showEvent):
 686                 self._buttonArtist.show(self.palette())
 687                 self._cachedCenterPosition = self.rect().center()
 688
 689                 QtGui.QWidget.showEvent(self, showEvent)
 690
 691         @misc_utils.log_exception(_moduleLogger)
 692         def hideEvent(self, hideEvent):
 693                 self._display.hide()
 694                 self._select_at(PieFiling.SELECTION_NONE)
 695                 QtGui.QWidget.hideEvent(self, hideEvent)
 696
 697         @misc_utils.log_exception(_moduleLogger)
 698         def paintEvent(self, paintEvent):
 699                 self.setButtonRadius(min(self.rect().width(), self.rect().height()) / 2 - 1)
 700                 if self._poppedUp:
 701                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_CENTER)
 702                 else:
 703                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_NONE)
 704                 offset = (self.size() - canvas.size()) / 2
 705
 706                 screen = QtGui.QPainter(self)
 707                 screen.drawPixmap(QtCore.QPoint(offset.width(), offset.height()), canvas)
 708
 709                 QtGui.QWidget.paintEvent(self, paintEvent)
 710
 711         def __iter__(self):
 712                 return iter(self._filing)
 713
 714         def __len__(self):
 715                 return len(self._filing)
 716
 717         def _popup_child(self, position):
 718                 self._poppedUp = True
 719                 self.aboutToShow.emit()
 720
 721                 self._delayPopupTimer.stop()
 722                 self._popupLocation = None
 723
 724                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 725                 self._display.move(position)
 726                 self._display.show()
 727
 728                 self.update()
 729
 730         def _hide_child(self):
 731                 self._poppedUp = False
 732                 self.aboutToHide.emit()
 733                 self._display.hide()
 734                 self.update()
 735
 736         def _select_at(self, index):
 737                 self._selectionIndex = index
 738
 739         def _update_selection(self, lastMousePos, ignoreOuter = False):
 740                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 741                 if radius < self._filing.innerRadius():
 742                         self._select_at(PieFiling.SELECTION_CENTER)
 743                 elif radius <= self._filing.outerRadius() or ignoreOuter:
 744                         self._select_at(self.indexAt(lastMousePos))
 745                 else:
 746                         self._select_at(PieFiling.SELECTION_NONE)
 747
 748         def _activate_at(self, index):
 749                 if index == PieFiling.SELECTION_NONE:
 750                         self.canceled.emit()
 751                         return
 752                 elif index == PieFiling.SELECTION_CENTER:
 753                         child = self._filing.center()
 754                 else:
 755                         child = self.itemAt(index)
 756
 757                 if child.action().isEnabled():
 758                         child.action().trigger()
 759                         self.activated.emit(index)
 760                 else:
 761                         self.canceled.emit()
 762
 763
 764 class QPieMenu(QtGui.QWidget):
 765
 766         activated = QtCore.pyqtSignal(int)
 767         highlighted = QtCore.pyqtSignal(int)
 768         canceled = QtCore.pyqtSignal()
 769         aboutToShow = QtCore.pyqtSignal()
 770         aboutToHide = QtCore.pyqtSignal()
 771
 772         def __init__(self, parent = None):
 773                 QtGui.QWidget.__init__(self, parent)
 774                 self._cachedCenterPosition = self.rect().center()
 775
 776                 self._filing = PieFiling()
 777                 self._artist = PieArtist(self._filing)
 778                 self._selectionIndex = PieFiling.SELECTION_NONE
 779
 780                 self._mousePosition = ()
 781                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 782
 783         def popup(self, pos):
 784                 self._update_selection(pos)
 785                 self.show()
 786
 787         def insertItem(self, item, index = -1):
 788                 self._filing.insertItem(item, index)
 789                 self.update()
 790
 791         def removeItemAt(self, index):
 792                 self._filing.removeItemAt(index)
 793                 self.update()
 794
 795         def set_center(self, item):
 796                 self._filing.set_center(item)
 797                 self.update()
 798
 799         def clear(self):
 800                 self._filing.clear()
 801                 self.update()
 802
 803         def itemAt(self, index):
 804                 return self._filing.itemAt(index)
 805
 806         def indexAt(self, point):
 807                 return self._filing.indexAt(self._cachedCenterPosition, point)
 808
 809         def innerRadius(self):
 810                 return self._filing.innerRadius()
 811
 812         def setInnerRadius(self, radius):
 813                 self._filing.setInnerRadius(radius)
 814                 self.update()
 815
 816         def outerRadius(self):
 817                 return self._filing.outerRadius()
 818
 819         def setOuterRadius(self, radius):
 820                 self._filing.setOuterRadius(radius)
 821                 self.update()
 822
 823         def sizeHint(self):
 824                 return self._artist.pieSize()
 825
 826         @misc_utils.log_exception(_moduleLogger)
 827         def mousePressEvent(self, mouseEvent):
 828                 lastSelection = self._selectionIndex
 829
 830                 lastMousePos = mouseEvent.pos()
 831                 self._update_selection(lastMousePos)
 832                 self._mousePosition = lastMousePos
 833
 834                 if lastSelection != self._selectionIndex:
 835                         self.highlighted.emit(self._selectionIndex)
 836                         self.update()
 837
 838         @misc_utils.log_exception(_moduleLogger)
 839         def mouseMoveEvent(self, mouseEvent):
 840                 lastSelection = self._selectionIndex
 841
 842                 lastMousePos = mouseEvent.pos()
 843                 self._update_selection(lastMousePos)
 844
 845                 if lastSelection != self._selectionIndex:
 846                         self.highlighted.emit(self._selectionIndex)
 847                         self.update()
 848
 849         @misc_utils.log_exception(_moduleLogger)
 850         def mouseReleaseEvent(self, mouseEvent):
 851                 lastSelection = self._selectionIndex
 852
 853                 lastMousePos = mouseEvent.pos()
 854                 self._update_selection(lastMousePos)
 855                 self._mousePosition = ()
 856
 857                 self._activate_at(self._selectionIndex)
 858                 self.update()
 859
 860         @misc_utils.log_exception(_moduleLogger)
 861         def keyPressEvent(self, keyEvent):
 862                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 863                         if self._selectionIndex != len(self._filing) - 1:
 864                                 nextSelection = self._selectionIndex + 1
 865                         else:
 866                                 nextSelection = 0
 867                         self._select_at(nextSelection)
 868                         self.update()
 869                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 870                         if 0 < self._selectionIndex:
 871                                 nextSelection = self._selectionIndex - 1
 872                         else:
 873                                 nextSelection = len(self._filing) - 1
 874                         self._select_at(nextSelection)
 875                         self.update()
 876                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 877                         self._activate_at(self._selectionIndex)
 878                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 879                         self._activate_at(PieFiling.SELECTION_NONE)
 880                 else:
 881                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 882
 883         @misc_utils.log_exception(_moduleLogger)
 884         def showEvent(self, showEvent):
 885                 self.aboutToShow.emit()
 886                 self._cachedCenterPosition = self.rect().center()
 887
 888                 mask = self._artist.show(self.palette())
 889                 self.setMask(mask)
 890
 891                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 892                 self._update_selection(lastMousePos)
 893
 894                 QtGui.QWidget.showEvent(self, showEvent)
 895
 896         @misc_utils.log_exception(_moduleLogger)
 897         def hideEvent(self, hideEvent):
 898                 self._artist.hide()
 899                 self._selectionIndex = PieFiling.SELECTION_NONE
 900                 QtGui.QWidget.hideEvent(self, hideEvent)
 901
 902         @misc_utils.log_exception(_moduleLogger)
 903         def paintEvent(self, paintEvent):
 904                 canvas = self._artist.paint(self._selectionIndex)
 905
 906                 screen = QtGui.QPainter(self)
 907                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 908
 909                 QtGui.QWidget.paintEvent(self, paintEvent)
 910
 911         def __iter__(self):
 912                 return iter(self._filing)
 913
 914         def __len__(self):
 915                 return len(self._filing)
 916
 917         def _select_at(self, index):
 918                 self._selectionIndex = index
 919
 920         def _update_selection(self, lastMousePos):
 921                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 922                 if radius < self._filing.innerRadius():
 923                         self._selectionIndex = PieFiling.SELECTION_CENTER
 924                 elif radius <= self._filing.outerRadius():
 925                         self._select_at(self.indexAt(lastMousePos))
 926                 else:
 927                         self._selectionIndex = PieFiling.SELECTION_NONE
 928
 929         def _activate_at(self, index):
 930                 if index == PieFiling.SELECTION_NONE:
 931                         self.canceled.emit()
 932                         self.aboutToHide.emit()
 933                         self.hide()
 934                         return
 935                 elif index == PieFiling.SELECTION_CENTER:
 936                         child = self._filing.center()
 937                 else:
 938                         child = self.itemAt(index)
 939
 940                 if child.isEnabled():
 941                         child.action().trigger()
 942                         self.activated.emit(index)
 943                 else:
 944                         self.canceled.emit()
 945                 self.aboutToHide.emit()
 946                 self.hide()
 947
 948
 949 def init_pies():
 950         PieFiling.NULL_CENTER.setEnabled(False)
 951
 952
 953 def _print(msg):
 954         print msg
 955
 956
 957 def _on_about_to_hide(app):
 958         app.exit()
 959
 960
 961 if __name__ == "__main__":
 962         app = QtGui.QApplication([])
 963         init_pies()
 964
 965         if False:
 966                 pie = QPieMenu()
 967                 pie.show()
 968
 969         if False:
 970                 singleAction = QtGui.QAction(None)
 971                 singleAction.setText("Boo")
 972                 singleItem = QActionPieItem(singleAction)
 973                 spie = QPieMenu()
 974                 spie.insertItem(singleItem)
 975                 spie.show()
 976
 977         if False:
 978                 oneAction = QtGui.QAction(None)
 979                 oneAction.setText("Chew")
 980                 oneItem = QActionPieItem(oneAction)
 981                 twoAction = QtGui.QAction(None)
 982                 twoAction.setText("Foo")
 983                 twoItem = QActionPieItem(twoAction)
 984                 iconTextAction = QtGui.QAction(None)
 985                 iconTextAction.setText("Icon")
 986                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 987                 iconTextItem = QActionPieItem(iconTextAction)
 988                 mpie = QPieMenu()
 989                 mpie.insertItem(oneItem)
 990                 mpie.insertItem(twoItem)
 991                 mpie.insertItem(oneItem)
 992                 mpie.insertItem(iconTextItem)
 993                 mpie.show()
 994
 995         if True:
 996                 oneAction = QtGui.QAction(None)
 997                 oneAction.setText("Chew")
 998                 oneAction.triggered.connect(lambda: _print("Chew"))
 999                 oneItem = QActionPieItem(oneAction)
1000                 twoAction = QtGui.QAction(None)
1001                 twoAction.setText("Foo")
1002                 twoAction.triggered.connect(lambda: _print("Foo"))
1003                 twoItem = QActionPieItem(twoAction)
1004                 iconAction = QtGui.QAction(None)
1005                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1006                 iconAction.triggered.connect(lambda: _print("Icon"))
1007                 iconItem = QActionPieItem(iconAction)
1008                 iconTextAction = QtGui.QAction(None)
1009                 iconTextAction.setText("Icon")
1010                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1011                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1012                 iconTextItem = QActionPieItem(iconTextAction)
1013                 mpie = QPieMenu()
1014                 mpie.set_center(iconItem)
1015                 mpie.insertItem(oneItem)
1016                 mpie.insertItem(twoItem)
1017                 mpie.insertItem(oneItem)
1018                 mpie.insertItem(iconTextItem)
1019                 mpie.show()
1020                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1021                 mpie.canceled.connect(lambda: _print("Canceled"))
1022
1023         if False:
1024                 oneAction = QtGui.QAction(None)
1025                 oneAction.setText("Chew")
1026                 oneAction.triggered.connect(lambda: _print("Chew"))
1027                 oneItem = QActionPieItem(oneAction)
1028                 twoAction = QtGui.QAction(None)
1029                 twoAction.setText("Foo")
1030                 twoAction.triggered.connect(lambda: _print("Foo"))
1031                 twoItem = QActionPieItem(twoAction)
1032                 iconAction = QtGui.QAction(None)
1033                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1034                 iconAction.triggered.connect(lambda: _print("Icon"))
1035                 iconItem = QActionPieItem(iconAction)
1036                 iconTextAction = QtGui.QAction(None)
1037                 iconTextAction.setText("Icon")
1038                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1039                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1040                 iconTextItem = QActionPieItem(iconTextAction)
1041                 pieFiling = PieFiling()
1042                 pieFiling.set_center(iconItem)
1043                 pieFiling.insertItem(oneItem)
1044                 pieFiling.insertItem(twoItem)
1045                 pieFiling.insertItem(oneItem)
1046                 pieFiling.insertItem(iconTextItem)
1047                 mpie = QPieDisplay(pieFiling)
1048                 mpie.show()
1049
1050         if False:
1051                 oneAction = QtGui.QAction(None)
1052                 oneAction.setText("Chew")
1053                 oneAction.triggered.connect(lambda: _print("Chew"))
1054                 oneItem = QActionPieItem(oneAction)
1055                 twoAction = QtGui.QAction(None)
1056                 twoAction.setText("Foo")
1057                 twoAction.triggered.connect(lambda: _print("Foo"))
1058                 twoItem = QActionPieItem(twoAction)
1059                 iconAction = QtGui.QAction(None)
1060                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1061                 iconAction.triggered.connect(lambda: _print("Icon"))
1062                 iconItem = QActionPieItem(iconAction)
1063                 iconTextAction = QtGui.QAction(None)
1064                 iconTextAction.setText("Icon")
1065                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1066                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1067                 iconTextItem = QActionPieItem(iconTextAction)
1068                 mpie = QPieButton(iconItem)
1069                 mpie.set_center(iconItem)
1070                 mpie.insertItem(oneItem)
1071                 mpie.insertItem(twoItem)
1072                 mpie.insertItem(oneItem)
1073                 mpie.insertItem(iconTextItem)
1074                 mpie.show()
1075                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1076                 mpie.canceled.connect(lambda: _print("Canceled"))
1077
1078         app.exec_()