vcs.maemo.org Git - ejpi/blob - src/libraries/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 = 32
  75         OUTER_RADIUS_DEFAULT = 128
  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 = 32
 196
 197         def __init__(self, filing):
 198                 self._filing = filing
 199
 200                 self._cachedOuterRadius = self._filing.outerRadius()
 201                 self._cachedInnerRadius = self._filing.innerRadius()
 202                 canvasSize = self._cachedOuterRadius * 2 + 1
 203                 self._canvas = QtGui.QPixmap(canvasSize, canvasSize)
 204                 self._mask = None
 205                 self.palette = None
 206
 207         def pieSize(self):
 208                 diameter = self._filing.outerRadius() * 2 + 1
 209                 return QtCore.QSize(diameter, diameter)
 210
 211         def centerSize(self):
 212                 painter = QtGui.QPainter(self._canvas)
 213                 text = self._filing.center().action().text()
 214                 fontMetrics = painter.fontMetrics()
 215                 if text:
 216                         textBoundingRect = fontMetrics.boundingRect(text)
 217                 else:
 218                         textBoundingRect = QtCore.QRect()
 219                 textWidth = textBoundingRect.width()
 220                 textHeight = textBoundingRect.height()
 221
 222                 return QtCore.QSize(
 223                         textWidth + self.ICON_SIZE_DEFAULT,
 224                         max(textHeight, self.ICON_SIZE_DEFAULT),
 225                 )
 226
 227         def show(self, palette):
 228                 self.palette = palette
 229
 230                 if (
 231                         self._cachedOuterRadius != self._filing.outerRadius() or
 232                         self._cachedInnerRadius != self._filing.innerRadius()
 233                 ):
 234                         self._cachedOuterRadius = self._filing.outerRadius()
 235                         self._cachedInnerRadius = self._filing.innerRadius()
 236                         self._canvas = self._canvas.scaled(self.pieSize())
 237
 238                 if self._mask is None:
 239                         self._mask = QtGui.QBitmap(self._canvas.size())
 240                         self._mask.fill(QtCore.Qt.color0)
 241                         self._generate_mask(self._mask)
 242                         self._canvas.setMask(self._mask)
 243                 return self._mask
 244
 245         def hide(self):
 246                 self.palette = None
 247
 248         def paint(self, selectionIndex):
 249                 painter = QtGui.QPainter(self._canvas)
 250                 painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
 251
 252                 adjustmentRect = self._canvas.rect().adjusted(0, 0, -1, -1)
 253
 254                 numChildren = len(self._filing)
 255                 if numChildren == 0:
 256                         if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 257                                 painter.setBrush(self.palette.highlight())
 258                         else:
 259                                 painter.setBrush(self.palette.background())
 260                         painter.setPen(self.palette.mid().color())
 261
 262                         painter.drawRect(self._canvas.rect())
 263                         self._paint_center_foreground(painter, selectionIndex)
 264                         return self._canvas
 265                 elif numChildren == 1:
 266                         if selectionIndex == 0 and self._filing[0].isEnabled():
 267                                 painter.setBrush(self.palette.highlight())
 268                         else:
 269                                 painter.setBrush(self.palette.background())
 270
 271                         painter.fillRect(self._canvas.rect(), painter.brush())
 272                 else:
 273                         for i in xrange(len(self._filing)):
 274                                 self._paint_slice_background(painter, adjustmentRect, i, selectionIndex)
 275
 276                 self._paint_center_background(painter, adjustmentRect, selectionIndex)
 277                 self._paint_center_foreground(painter, selectionIndex)
 278
 279                 for i in xrange(len(self._filing)):
 280                         self._paint_slice_foreground(painter, i, selectionIndex)
 281
 282                 return self._canvas
 283
 284         def _generate_mask(self, mask):
 285                 """
 286                 Specifies on the mask the shape of the pie menu
 287                 """
 288                 painter = QtGui.QPainter(mask)
 289                 painter.setPen(QtCore.Qt.color1)
 290                 painter.setBrush(QtCore.Qt.color1)
 291                 painter.drawEllipse(mask.rect().adjusted(0, 0, -1, -1))
 292
 293         def _paint_slice_background(self, painter, adjustmentRect, i, selectionIndex):
 294                 if i == selectionIndex and self._filing[i].isEnabled():
 295                         painter.setBrush(self.palette.highlight())
 296                 else:
 297                         painter.setBrush(self.palette.background())
 298                 painter.setPen(self.palette.mid().color())
 299
 300                 a = self._filing._index_to_angle(i, True)
 301                 b = self._filing._index_to_angle(i + 1, True)
 302                 if b < a:
 303                         b += _TWOPI
 304                 size = b - a
 305                 if size < 0:
 306                         size += _TWOPI
 307
 308                 startAngleInDeg = (a * 360 * 16) / _TWOPI
 309                 sizeInDeg = (size * 360 * 16) / _TWOPI
 310                 painter.drawPie(adjustmentRect, int(startAngleInDeg), int(sizeInDeg))
 311
 312         def _paint_slice_foreground(self, painter, i, selectionIndex):
 313                 child = self._filing[i]
 314
 315                 a = self._filing._index_to_angle(i, True)
 316                 b = self._filing._index_to_angle(i + 1, True)
 317                 if b < a:
 318                         b += _TWOPI
 319                 middleAngle = (a + b) / 2
 320                 averageRadius = (self._cachedInnerRadius + self._cachedOuterRadius) / 2
 321
 322                 sliceX = averageRadius * math.cos(middleAngle)
 323                 sliceY = - averageRadius * math.sin(middleAngle)
 324
 325                 piePos = self._canvas.rect().center()
 326                 pieX = piePos.x()
 327                 pieY = piePos.y()
 328                 self._paint_label(
 329                         painter, child.action(), i == selectionIndex, pieX+sliceX, pieY+sliceY
 330                 )
 331
 332         def _paint_label(self, painter, action, isSelected, x, y):
 333                 text = action.text()
 334                 fontMetrics = painter.fontMetrics()
 335                 if text:
 336                         textBoundingRect = fontMetrics.boundingRect(text)
 337                 else:
 338                         textBoundingRect = QtCore.QRect()
 339                 textWidth = textBoundingRect.width()
 340                 textHeight = textBoundingRect.height()
 341
 342                 icon = action.icon().pixmap(
 343                         QtCore.QSize(self.ICON_SIZE_DEFAULT, self.ICON_SIZE_DEFAULT),
 344                         QtGui.QIcon.Normal,
 345                         QtGui.QIcon.On,
 346                 )
 347                 iconWidth = icon.width()
 348                 iconHeight = icon.width()
 349                 averageWidth = (iconWidth + textWidth)/2
 350                 if not icon.isNull():
 351                         iconRect = QtCore.QRect(
 352                                 x - averageWidth,
 353                                 y - iconHeight/2,
 354                                 iconWidth,
 355                                 iconHeight,
 356                         )
 357
 358                         painter.drawPixmap(iconRect, icon)
 359
 360                 if text:
 361                         if isSelected:
 362                                 if action.isEnabled():
 363                                         pen = self.palette.highlightedText()
 364                                         brush = self.palette.highlight()
 365                                 else:
 366                                         pen = self.palette.mid()
 367                                         brush = self.palette.background()
 368                         else:
 369                                 if action.isEnabled():
 370                                         pen = self.palette.text()
 371                                 else:
 372                                         pen = self.palette.mid()
 373                                 brush = self.palette.background()
 374
 375                         leftX = x - averageWidth + iconWidth
 376                         topY = y + textHeight/2
 377                         painter.setPen(pen.color())
 378                         painter.setBrush(brush)
 379                         painter.drawText(leftX, topY, text)
 380
 381         def _paint_center_background(self, painter, adjustmentRect, selectionIndex):
 382                 dark = self.palette.dark().color()
 383                 light = self.palette.light().color()
 384                 if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 385                         background = self.palette.highlight().color()
 386                 else:
 387                         background = self.palette.background().color()
 388
 389                 innerRadius = self._cachedInnerRadius
 390                 adjustmentCenterPos = adjustmentRect.center()
 391                 innerRect = QtCore.QRect(
 392                         adjustmentCenterPos.x() - innerRadius,
 393                         adjustmentCenterPos.y() - innerRadius,
 394                         innerRadius * 2 + 1,
 395                         innerRadius * 2 + 1,
 396                 )
 397
 398                 painter.setPen(QtCore.Qt.NoPen)
 399                 painter.setBrush(background)
 400                 painter.drawPie(innerRect, 0, 360 * 16)
 401
 402                 painter.setPen(QtGui.QPen(dark, 1))
 403                 painter.setBrush(QtCore.Qt.NoBrush)
 404                 painter.drawEllipse(innerRect)
 405
 406                 painter.setPen(QtGui.QPen(dark, 1))
 407                 painter.setBrush(QtCore.Qt.NoBrush)
 408                 painter.drawEllipse(adjustmentRect)
 409
 410                 r = QtCore.QRect(innerRect)
 411                 innerCenter = r.center()
 412                 innerRect.setLeft(innerCenter.x() + ((r.left() - innerCenter.x()) / 3) * 1)
 413                 innerRect.setRight(innerCenter.x() + ((r.right() - innerCenter.x()) / 3) * 1)
 414                 innerRect.setTop(innerCenter.y() + ((r.top() - innerCenter.y()) / 3) * 1)
 415                 innerRect.setBottom(innerCenter.y() + ((r.bottom() - innerCenter.y()) / 3) * 1)
 416
 417         def _paint_center_foreground(self, painter, selectionIndex):
 418                 centerPos = self._canvas.rect().center()
 419                 pieX = centerPos.x()
 420                 pieY = centerPos.y()
 421
 422                 x = pieX
 423                 y = pieY
 424
 425                 self._paint_label(
 426                         painter,
 427                         self._filing.center().action(),
 428                         selectionIndex == PieFiling.SELECTION_CENTER,
 429                         x, y
 430                 )
 431
 432
 433 class QPieDisplay(QtGui.QWidget):
 434
 435         def __init__(self, filing, parent = None, flags = QtCore.Qt.Window):
 436                 QtGui.QWidget.__init__(self, parent, flags)
 437                 self._filing = filing
 438                 self._artist = PieArtist(self._filing)
 439                 self._selectionIndex = PieFiling.SELECTION_NONE
 440
 441         def popup(self, pos):
 442                 self._update_selection(pos)
 443                 self.show()
 444
 445         def sizeHint(self):
 446                 return self._artist.pieSize()
 447
 448         @misc_utils.log_exception(_moduleLogger)
 449         def showEvent(self, showEvent):
 450                 mask = self._artist.show(self.palette())
 451                 self.setMask(mask)
 452
 453                 QtGui.QWidget.showEvent(self, showEvent)
 454
 455         @misc_utils.log_exception(_moduleLogger)
 456         def hideEvent(self, hideEvent):
 457                 self._artist.hide()
 458                 self._selectionIndex = PieFiling.SELECTION_NONE
 459                 QtGui.QWidget.hideEvent(self, hideEvent)
 460
 461         @misc_utils.log_exception(_moduleLogger)
 462         def paintEvent(self, paintEvent):
 463                 canvas = self._artist.paint(self._selectionIndex)
 464
 465                 screen = QtGui.QPainter(self)
 466                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 467
 468                 QtGui.QWidget.paintEvent(self, paintEvent)
 469
 470         def selectAt(self, index):
 471                 oldIndex = self._selectionIndex
 472                 self._selectionIndex = index
 473                 if self.isVisible():
 474                         self.update()
 475
 476
 477 class QPieButton(QtGui.QWidget):
 478
 479         activated = QtCore.pyqtSignal(int)
 480         highlighted = QtCore.pyqtSignal(int)
 481         canceled = QtCore.pyqtSignal()
 482         aboutToShow = QtCore.pyqtSignal()
 483         aboutToHide = QtCore.pyqtSignal()
 484
 485         BUTTON_RADIUS = 24
 486         DELAY = 250
 487
 488         def __init__(self, buttonSlice, parent = None):
 489                 QtGui.QWidget.__init__(self, parent)
 490                 self._cachedCenterPosition = self.rect().center()
 491
 492                 self._filing = PieFiling()
 493                 self._display = QPieDisplay(self._filing, None, QtCore.Qt.SplashScreen)
 494                 self._selectionIndex = PieFiling.SELECTION_NONE
 495
 496                 self._buttonFiling = PieFiling()
 497                 self._buttonFiling.set_center(buttonSlice)
 498                 # @todo Figure out how to make the button auto-fill to content
 499                 self._buttonFiling.setOuterRadius(self.BUTTON_RADIUS)
 500                 self._buttonArtist = PieArtist(self._buttonFiling)
 501                 self._poppedUp = False
 502
 503                 self._delayPopupTimer = QtCore.QTimer()
 504                 self._delayPopupTimer.setInterval(self.DELAY)
 505                 self._delayPopupTimer.setSingleShot(True)
 506                 self._delayPopupTimer.timeout.connect(self._on_delayed_popup)
 507                 self._popupLocation = None
 508
 509                 self._mousePosition = None
 510                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 511
 512         def insertItem(self, item, index = -1):
 513                 self._filing.insertItem(item, index)
 514
 515         def removeItemAt(self, index):
 516                 self._filing.removeItemAt(index)
 517
 518         def set_center(self, item):
 519                 self._filing.set_center(item)
 520
 521         def set_button(self, item):
 522                 self.update()
 523
 524         def clear(self):
 525                 self._filing.clear()
 526
 527         def itemAt(self, index):
 528                 return self._filing.itemAt(index)
 529
 530         def indexAt(self, point):
 531                 return self._filing.indexAt(self._cachedCenterPosition, point)
 532
 533         def innerRadius(self):
 534                 return self._filing.innerRadius()
 535
 536         def setInnerRadius(self, radius):
 537                 self._filing.setInnerRadius(radius)
 538
 539         def outerRadius(self):
 540                 return self._filing.outerRadius()
 541
 542         def setOuterRadius(self, radius):
 543                 self._filing.setOuterRadius(radius)
 544
 545         def buttonRadius(self):
 546                 return self._buttonFiling.outerRadius()
 547
 548         def setButtonRadius(self, radius):
 549                 self._buttonFiling.setOuterRadius(radius)
 550
 551         def sizeHint(self):
 552                 return self._buttonArtist.pieSize()
 553
 554         @misc_utils.log_exception(_moduleLogger)
 555         def mousePressEvent(self, mouseEvent):
 556                 lastSelection = self._selectionIndex
 557
 558                 lastMousePos = mouseEvent.pos()
 559                 self._mousePosition = lastMousePos
 560                 self._update_selection(self._cachedCenterPosition)
 561
 562                 self.highlighted.emit(self._selectionIndex)
 563
 564                 self._display.selectAt(self._selectionIndex)
 565                 self._popupLocation = mouseEvent.globalPos()
 566                 self._delayPopupTimer.start()
 567
 568         @misc_utils.log_exception(_moduleLogger)
 569         def _on_delayed_popup(self):
 570                 assert self._popupLocation is not None
 571                 self._popup_child(self._popupLocation)
 572
 573         @misc_utils.log_exception(_moduleLogger)
 574         def mouseMoveEvent(self, mouseEvent):
 575                 lastSelection = self._selectionIndex
 576
 577                 lastMousePos = mouseEvent.pos()
 578                 if self._mousePosition is None:
 579                         # Absolute
 580                         self._update_selection(lastMousePos)
 581                 else:
 582                         # Relative
 583                         self._update_selection(self._cachedCenterPosition + (lastMousePos - self._mousePosition))
 584
 585                 if lastSelection != self._selectionIndex:
 586                         self.highlighted.emit(self._selectionIndex)
 587                         self._display.selectAt(self._selectionIndex)
 588
 589                 if self._selectionIndex != PieFiling.SELECTION_CENTER and self._delayPopupTimer.isActive():
 590                         self._on_delayed_popup()
 591
 592         @misc_utils.log_exception(_moduleLogger)
 593         def mouseReleaseEvent(self, mouseEvent):
 594                 self._delayPopupTimer.stop()
 595                 self._popupLocation = None
 596
 597                 lastSelection = self._selectionIndex
 598
 599                 lastMousePos = mouseEvent.pos()
 600                 if self._mousePosition is None:
 601                         # Absolute
 602                         self._update_selection(lastMousePos)
 603                 else:
 604                         # Relative
 605                         self._update_selection(self._cachedCenterPosition + (lastMousePos - self._mousePosition))
 606                 self._mousePosition = None
 607
 608                 self._activate_at(self._selectionIndex)
 609                 self._hide_child()
 610
 611         @misc_utils.log_exception(_moduleLogger)
 612         def keyPressEvent(self, keyEvent):
 613                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 614                         self._popup_child(QtGui.QCursor.pos())
 615                         if self._selectionIndex != len(self._filing) - 1:
 616                                 nextSelection = self._selectionIndex + 1
 617                         else:
 618                                 nextSelection = 0
 619                         self._select_at(nextSelection)
 620                         self._display.selectAt(self._selectionIndex)
 621                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 622                         self._popup_child(QtGui.QCursor.pos())
 623                         if 0 < self._selectionIndex:
 624                                 nextSelection = self._selectionIndex - 1
 625                         else:
 626                                 nextSelection = len(self._filing) - 1
 627                         self._select_at(nextSelection)
 628                         self._display.selectAt(self._selectionIndex)
 629                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 630                         self._popup_child(QtGui.QCursor.pos())
 631                         self._select_at(PieFiling.SELECTION_CENTER)
 632                         self._display.selectAt(self._selectionIndex)
 633                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 634                         self._delayPopupTimer.stop()
 635                         self._popupLocation = None
 636                         self._activate_at(self._selectionIndex)
 637                         self._hide_child()
 638                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 639                         self._delayPopupTimer.stop()
 640                         self._popupLocation = None
 641                         self._activate_at(PieFiling.SELECTION_NONE)
 642                         self._hide_child()
 643                 else:
 644                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 645
 646         @misc_utils.log_exception(_moduleLogger)
 647         def showEvent(self, showEvent):
 648                 self._buttonArtist.show(self.palette())
 649                 self._cachedCenterPosition = self.rect().center()
 650
 651                 QtGui.QWidget.showEvent(self, showEvent)
 652
 653         @misc_utils.log_exception(_moduleLogger)
 654         def hideEvent(self, hideEvent):
 655                 self._display.hide()
 656                 self._select_at(PieFiling.SELECTION_NONE)
 657                 QtGui.QWidget.hideEvent(self, hideEvent)
 658
 659         @misc_utils.log_exception(_moduleLogger)
 660         def paintEvent(self, paintEvent):
 661                 if self._poppedUp:
 662                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_CENTER)
 663                 else:
 664                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_NONE)
 665
 666                 screen = QtGui.QPainter(self)
 667                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 668
 669                 QtGui.QWidget.paintEvent(self, paintEvent)
 670
 671         def __iter__(self):
 672                 return iter(self._filing)
 673
 674         def __len__(self):
 675                 return len(self._filing)
 676
 677         def _popup_child(self, position):
 678                 self._poppedUp = True
 679                 self.aboutToShow.emit()
 680
 681                 self._delayPopupTimer.stop()
 682                 self._popupLocation = None
 683
 684                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 685                 self._display.move(position)
 686                 self._display.show()
 687
 688                 self.update()
 689
 690         def _hide_child(self):
 691                 self._poppedUp = False
 692                 self.aboutToHide.emit()
 693                 self._display.hide()
 694                 self.update()
 695
 696         def _select_at(self, index):
 697                 self._selectionIndex = index
 698
 699         def _update_selection(self, lastMousePos):
 700                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 701                 if radius < self._filing.innerRadius():
 702                         self._select_at(PieFiling.SELECTION_CENTER)
 703                 elif radius <= self._filing.outerRadius():
 704                         self._select_at(self.indexAt(lastMousePos))
 705                 else:
 706                         self._select_at(PieFiling.SELECTION_NONE)
 707
 708         def _activate_at(self, index):
 709                 if index == PieFiling.SELECTION_NONE:
 710                         self.canceled.emit()
 711                         return
 712                 elif index == PieFiling.SELECTION_CENTER:
 713                         child = self._filing.center()
 714                 else:
 715                         child = self.itemAt(index)
 716
 717                 if child.action().isEnabled():
 718                         child.action().trigger()
 719                         self.activated.emit(index)
 720                 else:
 721                         self.canceled.emit()
 722
 723
 724 class QPieMenu(QtGui.QWidget):
 725
 726         activated = QtCore.pyqtSignal(int)
 727         highlighted = QtCore.pyqtSignal(int)
 728         canceled = QtCore.pyqtSignal()
 729         aboutToShow = QtCore.pyqtSignal()
 730         aboutToHide = QtCore.pyqtSignal()
 731
 732         def __init__(self, parent = None):
 733                 QtGui.QWidget.__init__(self, parent)
 734                 self._cachedCenterPosition = self.rect().center()
 735
 736                 self._filing = PieFiling()
 737                 self._artist = PieArtist(self._filing)
 738                 self._selectionIndex = PieFiling.SELECTION_NONE
 739
 740                 self._mousePosition = ()
 741                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 742
 743         def popup(self, pos):
 744                 self._update_selection(pos)
 745                 self.show()
 746
 747         def insertItem(self, item, index = -1):
 748                 self._filing.insertItem(item, index)
 749                 self.update()
 750
 751         def removeItemAt(self, index):
 752                 self._filing.removeItemAt(index)
 753                 self.update()
 754
 755         def set_center(self, item):
 756                 self._filing.set_center(item)
 757                 self.update()
 758
 759         def clear(self):
 760                 self._filing.clear()
 761                 self.update()
 762
 763         def itemAt(self, index):
 764                 return self._filing.itemAt(index)
 765
 766         def indexAt(self, point):
 767                 return self._filing.indexAt(self._cachedCenterPosition, point)
 768
 769         def innerRadius(self):
 770                 return self._filing.innerRadius()
 771
 772         def setInnerRadius(self, radius):
 773                 self._filing.setInnerRadius(radius)
 774                 self.update()
 775
 776         def outerRadius(self):
 777                 return self._filing.outerRadius()
 778
 779         def setOuterRadius(self, radius):
 780                 self._filing.setOuterRadius(radius)
 781                 self.update()
 782
 783         def sizeHint(self):
 784                 return self._artist.pieSize()
 785
 786         @misc_utils.log_exception(_moduleLogger)
 787         def mousePressEvent(self, mouseEvent):
 788                 lastSelection = self._selectionIndex
 789
 790                 lastMousePos = mouseEvent.pos()
 791                 self._update_selection(lastMousePos)
 792                 self._mousePosition = lastMousePos
 793
 794                 if lastSelection != self._selectionIndex:
 795                         self.highlighted.emit(self._selectionIndex)
 796                         self.update()
 797
 798         @misc_utils.log_exception(_moduleLogger)
 799         def mouseMoveEvent(self, mouseEvent):
 800                 lastSelection = self._selectionIndex
 801
 802                 lastMousePos = mouseEvent.pos()
 803                 self._update_selection(lastMousePos)
 804
 805                 if lastSelection != self._selectionIndex:
 806                         self.highlighted.emit(self._selectionIndex)
 807                         self.update()
 808
 809         @misc_utils.log_exception(_moduleLogger)
 810         def mouseReleaseEvent(self, mouseEvent):
 811                 lastSelection = self._selectionIndex
 812
 813                 lastMousePos = mouseEvent.pos()
 814                 self._update_selection(lastMousePos)
 815                 self._mousePosition = ()
 816
 817                 self._activate_at(self._selectionIndex)
 818                 self.update()
 819
 820         @misc_utils.log_exception(_moduleLogger)
 821         def keyPressEvent(self, keyEvent):
 822                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 823                         if self._selectionIndex != len(self._filing) - 1:
 824                                 nextSelection = self._selectionIndex + 1
 825                         else:
 826                                 nextSelection = 0
 827                         self._select_at(nextSelection)
 828                         self.update()
 829                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 830                         if 0 < self._selectionIndex:
 831                                 nextSelection = self._selectionIndex - 1
 832                         else:
 833                                 nextSelection = len(self._filing) - 1
 834                         self._select_at(nextSelection)
 835                         self.update()
 836                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 837                         self._activate_at(self._selectionIndex)
 838                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 839                         self._activate_at(PieFiling.SELECTION_NONE)
 840                 else:
 841                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 842
 843         @misc_utils.log_exception(_moduleLogger)
 844         def showEvent(self, showEvent):
 845                 self.aboutToShow.emit()
 846                 self._cachedCenterPosition = self.rect().center()
 847
 848                 mask = self._artist.show(self.palette())
 849                 self.setMask(mask)
 850
 851                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 852                 self._update_selection(lastMousePos)
 853
 854                 QtGui.QWidget.showEvent(self, showEvent)
 855
 856         @misc_utils.log_exception(_moduleLogger)
 857         def hideEvent(self, hideEvent):
 858                 self._artist.hide()
 859                 self._selectionIndex = PieFiling.SELECTION_NONE
 860                 QtGui.QWidget.hideEvent(self, hideEvent)
 861
 862         @misc_utils.log_exception(_moduleLogger)
 863         def paintEvent(self, paintEvent):
 864                 canvas = self._artist.paint(self._selectionIndex)
 865
 866                 screen = QtGui.QPainter(self)
 867                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 868
 869                 QtGui.QWidget.paintEvent(self, paintEvent)
 870
 871         def __iter__(self):
 872                 return iter(self._filing)
 873
 874         def __len__(self):
 875                 return len(self._filing)
 876
 877         def _select_at(self, index):
 878                 self._selectionIndex = index
 879
 880         def _update_selection(self, lastMousePos):
 881                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 882                 if radius < self._filing.innerRadius():
 883                         self._selectionIndex = PieFiling.SELECTION_CENTER
 884                 elif radius <= self._filing.outerRadius():
 885                         self._select_at(self.indexAt(lastMousePos))
 886                 else:
 887                         self._selectionIndex = PieFiling.SELECTION_NONE
 888
 889         def _activate_at(self, index):
 890                 if index == PieFiling.SELECTION_NONE:
 891                         self.canceled.emit()
 892                         self.aboutToHide.emit()
 893                         self.hide()
 894                         return
 895                 elif index == PieFiling.SELECTION_CENTER:
 896                         child = self._filing.center()
 897                 else:
 898                         child = self.itemAt(index)
 899
 900                 if child.isEnabled():
 901                         child.action().trigger()
 902                         self.activated.emit(index)
 903                 else:
 904                         self.canceled.emit()
 905                 self.aboutToHide.emit()
 906                 self.hide()
 907
 908
 909 def init_pies():
 910         PieFiling.NULL_CENTER.setEnabled(False)
 911
 912
 913 def _print(msg):
 914         print msg
 915
 916
 917 def _on_about_to_hide(app):
 918         app.exit()
 919
 920
 921 if __name__ == "__main__":
 922         app = QtGui.QApplication([])
 923         init_pies()
 924
 925         if False:
 926                 pie = QPieMenu()
 927                 pie.show()
 928
 929         if False:
 930                 singleAction = QtGui.QAction(None)
 931                 singleAction.setText("Boo")
 932                 singleItem = QActionPieItem(singleAction)
 933                 spie = QPieMenu()
 934                 spie.insertItem(singleItem)
 935                 spie.show()
 936
 937         if False:
 938                 oneAction = QtGui.QAction(None)
 939                 oneAction.setText("Chew")
 940                 oneItem = QActionPieItem(oneAction)
 941                 twoAction = QtGui.QAction(None)
 942                 twoAction.setText("Foo")
 943                 twoItem = QActionPieItem(twoAction)
 944                 iconTextAction = QtGui.QAction(None)
 945                 iconTextAction.setText("Icon")
 946                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 947                 iconTextItem = QActionPieItem(iconTextAction)
 948                 mpie = QPieMenu()
 949                 mpie.insertItem(oneItem)
 950                 mpie.insertItem(twoItem)
 951                 mpie.insertItem(oneItem)
 952                 mpie.insertItem(iconTextItem)
 953                 mpie.show()
 954
 955         if True:
 956                 oneAction = QtGui.QAction(None)
 957                 oneAction.setText("Chew")
 958                 oneAction.triggered.connect(lambda: _print("Chew"))
 959                 oneItem = QActionPieItem(oneAction)
 960                 twoAction = QtGui.QAction(None)
 961                 twoAction.setText("Foo")
 962                 twoAction.triggered.connect(lambda: _print("Foo"))
 963                 twoItem = QActionPieItem(twoAction)
 964                 iconAction = QtGui.QAction(None)
 965                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 966                 iconAction.triggered.connect(lambda: _print("Icon"))
 967                 iconItem = QActionPieItem(iconAction)
 968                 iconTextAction = QtGui.QAction(None)
 969                 iconTextAction.setText("Icon")
 970                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 971                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
 972                 iconTextItem = QActionPieItem(iconTextAction)
 973                 mpie = QPieMenu()
 974                 mpie.set_center(iconItem)
 975                 mpie.insertItem(oneItem)
 976                 mpie.insertItem(twoItem)
 977                 mpie.insertItem(oneItem)
 978                 mpie.insertItem(iconTextItem)
 979                 mpie.show()
 980                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
 981                 mpie.canceled.connect(lambda: _print("Canceled"))
 982
 983         if False:
 984                 oneAction = QtGui.QAction(None)
 985                 oneAction.setText("Chew")
 986                 oneAction.triggered.connect(lambda: _print("Chew"))
 987                 oneItem = QActionPieItem(oneAction)
 988                 twoAction = QtGui.QAction(None)
 989                 twoAction.setText("Foo")
 990                 twoAction.triggered.connect(lambda: _print("Foo"))
 991                 twoItem = QActionPieItem(twoAction)
 992                 iconAction = QtGui.QAction(None)
 993                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 994                 iconAction.triggered.connect(lambda: _print("Icon"))
 995                 iconItem = QActionPieItem(iconAction)
 996                 iconTextAction = QtGui.QAction(None)
 997                 iconTextAction.setText("Icon")
 998                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 999                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1000                 iconTextItem = QActionPieItem(iconTextAction)
1001                 pieFiling = PieFiling()
1002                 pieFiling.set_center(iconItem)
1003                 pieFiling.insertItem(oneItem)
1004                 pieFiling.insertItem(twoItem)
1005                 pieFiling.insertItem(oneItem)
1006                 pieFiling.insertItem(iconTextItem)
1007                 mpie = QPieDisplay(pieFiling)
1008                 mpie.show()
1009
1010         if False:
1011                 oneAction = QtGui.QAction(None)
1012                 oneAction.setText("Chew")
1013                 oneAction.triggered.connect(lambda: _print("Chew"))
1014                 oneItem = QActionPieItem(oneAction)
1015                 twoAction = QtGui.QAction(None)
1016                 twoAction.setText("Foo")
1017                 twoAction.triggered.connect(lambda: _print("Foo"))
1018                 twoItem = QActionPieItem(twoAction)
1019                 iconAction = QtGui.QAction(None)
1020                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1021                 iconAction.triggered.connect(lambda: _print("Icon"))
1022                 iconItem = QActionPieItem(iconAction)
1023                 iconTextAction = QtGui.QAction(None)
1024                 iconTextAction.setText("Icon")
1025                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1026                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1027                 iconTextItem = QActionPieItem(iconTextAction)
1028                 mpie = QPieButton(iconItem)
1029                 mpie.set_center(iconItem)
1030                 mpie.insertItem(oneItem)
1031                 mpie.insertItem(twoItem)
1032                 mpie.insertItem(oneItem)
1033                 mpie.insertItem(iconTextItem)
1034                 mpie.show()
1035                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1036                 mpie.canceled.connect(lambda: _print("Canceled"))
1037
1038         app.exec_()