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                         self._paint_center_background(painter, adjustmentRect, selectionIndex)
 261                         self._paint_center_foreground(painter, selectionIndex)
 262                         return self._canvas
 263                 else:
 264                         for i in xrange(len(self._filing)):
 265                                 self._paint_slice_background(painter, adjustmentRect, i, selectionIndex)
 266
 267                 self._paint_center_background(painter, adjustmentRect, selectionIndex)
 268                 self._paint_center_foreground(painter, selectionIndex)
 269
 270                 for i in xrange(len(self._filing)):
 271                         self._paint_slice_foreground(painter, i, selectionIndex)
 272
 273                 return self._canvas
 274
 275         def _generate_mask(self, mask):
 276                 """
 277                 Specifies on the mask the shape of the pie menu
 278                 """
 279                 painter = QtGui.QPainter(mask)
 280                 painter.setPen(QtCore.Qt.color1)
 281                 painter.setBrush(QtCore.Qt.color1)
 282                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 283                         painter.drawRect(mask.rect())
 284                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 285                         painter.drawEllipse(mask.rect().adjusted(0, 0, -1, -1))
 286                 else:
 287                         raise NotImplementedError(self.DEFAULT_SHAPE)
 288
 289         def _paint_slice_background(self, painter, adjustmentRect, i, selectionIndex):
 290                 if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 291                         currentWidth = adjustmentRect.width()
 292                         newWidth = math.sqrt(2) * currentWidth
 293                         dx = (newWidth - currentWidth) / 2
 294                         adjustmentRect = adjustmentRect.adjusted(-dx, -dx, dx, dx)
 295                 elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 296                         pass
 297                 else:
 298                         raise NotImplementedError(self.DEFAULT_SHAPE)
 299
 300                 if i == selectionIndex and self._filing[i].isEnabled():
 301                         painter.setBrush(self.palette.highlight())
 302                         painter.setPen(self.palette.highlight().color())
 303                 else:
 304                         painter.setBrush(self.palette.window())
 305                         painter.setPen(self.palette.window().color())
 306
 307                 a = self._filing._index_to_angle(i, True)
 308                 b = self._filing._index_to_angle(i + 1, True)
 309                 if b < a:
 310                         b += _TWOPI
 311                 size = b - a
 312                 if size < 0:
 313                         size += _TWOPI
 314
 315                 startAngleInDeg = (a * 360 * 16) / _TWOPI
 316                 sizeInDeg = (size * 360 * 16) / _TWOPI
 317                 painter.drawPie(adjustmentRect, int(startAngleInDeg), int(sizeInDeg))
 318
 319         def _paint_slice_foreground(self, painter, i, selectionIndex):
 320                 child = self._filing[i]
 321
 322                 a = self._filing._index_to_angle(i, True)
 323                 b = self._filing._index_to_angle(i + 1, True)
 324                 if b < a:
 325                         b += _TWOPI
 326                 middleAngle = (a + b) / 2
 327                 averageRadius = (self._cachedInnerRadius + self._cachedOuterRadius) / 2
 328
 329                 sliceX = averageRadius * math.cos(middleAngle)
 330                 sliceY = - averageRadius * math.sin(middleAngle)
 331
 332                 piePos = self._canvas.rect().center()
 333                 pieX = piePos.x()
 334                 pieY = piePos.y()
 335                 self._paint_label(
 336                         painter, child.action(), i == selectionIndex, pieX+sliceX, pieY+sliceY
 337                 )
 338
 339         def _paint_label(self, painter, action, isSelected, x, y):
 340                 text = action.text()
 341                 fontMetrics = painter.fontMetrics()
 342                 if text:
 343                         textBoundingRect = fontMetrics.boundingRect(text)
 344                 else:
 345                         textBoundingRect = QtCore.QRect()
 346                 textWidth = textBoundingRect.width()
 347                 textHeight = textBoundingRect.height()
 348
 349                 icon = action.icon().pixmap(
 350                         QtCore.QSize(self.ICON_SIZE_DEFAULT, self.ICON_SIZE_DEFAULT),
 351                         QtGui.QIcon.Normal,
 352                         QtGui.QIcon.On,
 353                 )
 354                 iconWidth = icon.width()
 355                 iconHeight = icon.width()
 356                 averageWidth = (iconWidth + textWidth)/2
 357                 if not icon.isNull():
 358                         iconRect = QtCore.QRect(
 359                                 x - averageWidth,
 360                                 y - iconHeight/2,
 361                                 iconWidth,
 362                                 iconHeight,
 363                         )
 364
 365                         painter.drawPixmap(iconRect, icon)
 366
 367                 if text:
 368                         if isSelected:
 369                                 if action.isEnabled():
 370                                         pen = self.palette.highlightedText()
 371                                         brush = self.palette.highlight()
 372                                 else:
 373                                         pen = self.palette.mid()
 374                                         brush = self.palette.window()
 375                         else:
 376                                 if action.isEnabled():
 377                                         pen = self.palette.windowText()
 378                                 else:
 379                                         pen = self.palette.mid()
 380                                 brush = self.palette.window()
 381
 382                         leftX = x - averageWidth + iconWidth
 383                         topY = y + textHeight/2
 384                         painter.setPen(pen.color())
 385                         painter.setBrush(brush)
 386                         painter.drawText(leftX, topY, text)
 387
 388         def _paint_center_background(self, painter, adjustmentRect, selectionIndex):
 389                 if len(self._filing) == 0:
 390                         if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 391                                 painter.setBrush(self.palette.highlight())
 392                         else:
 393                                 painter.setBrush(self.palette.window())
 394                         painter.setPen(self.palette.mid().color())
 395
 396                         painter.drawRect(self._canvas.rect())
 397                 else:
 398                         dark = self.palette.mid().color()
 399                         light = self.palette.light().color()
 400                         if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 401                                 background = self.palette.highlight().color()
 402                         else:
 403                                 background = self.palette.window().color()
 404
 405                         innerRadius = self._cachedInnerRadius
 406                         adjustmentCenterPos = adjustmentRect.center()
 407                         innerRect = QtCore.QRect(
 408                                 adjustmentCenterPos.x() - innerRadius,
 409                                 adjustmentCenterPos.y() - innerRadius,
 410                                 innerRadius * 2 + 1,
 411                                 innerRadius * 2 + 1,
 412                         )
 413
 414                         painter.setPen(QtCore.Qt.NoPen)
 415                         painter.setBrush(background)
 416                         painter.drawPie(innerRect, 0, 360 * 16)
 417
 418                         if self.DEFAULT_SHAPE == self.SHAPE_SQUARE:
 419                                 pass
 420                         elif self.DEFAULT_SHAPE == self.SHAPE_CIRCLE:
 421                                 painter.setPen(QtGui.QPen(dark, 1))
 422                                 painter.setBrush(QtCore.Qt.NoBrush)
 423                                 painter.drawEllipse(adjustmentRect)
 424                         else:
 425                                 raise NotImplementedError(self.DEFAULT_SHAPE)
 426
 427         def _paint_center_foreground(self, painter, selectionIndex):
 428                 centerPos = self._canvas.rect().center()
 429                 pieX = centerPos.x()
 430                 pieY = centerPos.y()
 431
 432                 x = pieX
 433                 y = pieY
 434
 435                 self._paint_label(
 436                         painter,
 437                         self._filing.center().action(),
 438                         selectionIndex == PieFiling.SELECTION_CENTER,
 439                         x, y
 440                 )
 441
 442
 443 class QPieDisplay(QtGui.QWidget):
 444
 445         def __init__(self, filing, parent = None, flags = QtCore.Qt.Window):
 446                 QtGui.QWidget.__init__(self, parent, flags)
 447                 self._filing = filing
 448                 self._artist = PieArtist(self._filing)
 449                 self._selectionIndex = PieFiling.SELECTION_NONE
 450
 451         def popup(self, pos):
 452                 self._update_selection(pos)
 453                 self.show()
 454
 455         def sizeHint(self):
 456                 return self._artist.pieSize()
 457
 458         @misc_utils.log_exception(_moduleLogger)
 459         def showEvent(self, showEvent):
 460                 mask = self._artist.show(self.palette())
 461                 self.setMask(mask)
 462
 463                 QtGui.QWidget.showEvent(self, showEvent)
 464
 465         @misc_utils.log_exception(_moduleLogger)
 466         def hideEvent(self, hideEvent):
 467                 self._artist.hide()
 468                 self._selectionIndex = PieFiling.SELECTION_NONE
 469                 QtGui.QWidget.hideEvent(self, hideEvent)
 470
 471         @misc_utils.log_exception(_moduleLogger)
 472         def paintEvent(self, paintEvent):
 473                 canvas = self._artist.paint(self._selectionIndex)
 474                 offset = (self.size() - canvas.size()) / 2
 475
 476                 screen = QtGui.QPainter(self)
 477                 screen.drawPixmap(QtCore.QPoint(offset.width(), offset.height()), canvas)
 478
 479                 QtGui.QWidget.paintEvent(self, paintEvent)
 480
 481         def selectAt(self, index):
 482                 oldIndex = self._selectionIndex
 483                 self._selectionIndex = index
 484                 if self.isVisible():
 485                         self.update()
 486
 487
 488 class QPieButton(QtGui.QWidget):
 489
 490         activated = QtCore.pyqtSignal(int)
 491         highlighted = QtCore.pyqtSignal(int)
 492         canceled = QtCore.pyqtSignal()
 493         aboutToShow = QtCore.pyqtSignal()
 494         aboutToHide = QtCore.pyqtSignal()
 495
 496         BUTTON_RADIUS = 24
 497         DELAY = 250
 498
 499         def __init__(self, buttonSlice, parent = None, buttonSlices = None):
 500                 # @bug Artifacts on Maemo 5 due to window 3D effects, find way to disable them for just these?
 501                 # @bug The pie's are being pushed back on screen on Maemo, leading to coordinate issues
 502                 QtGui.QWidget.__init__(self, parent)
 503                 self._cachedCenterPosition = self.rect().center()
 504
 505                 self._filing = PieFiling()
 506                 self._display = QPieDisplay(self._filing, None, QtCore.Qt.SplashScreen)
 507                 self._selectionIndex = PieFiling.SELECTION_NONE
 508
 509                 self._buttonFiling = PieFiling()
 510                 self._buttonFiling.set_center(buttonSlice)
 511                 if buttonSlices is not None:
 512                         for slice in buttonSlices:
 513                                 self._buttonFiling.insertItem(slice)
 514                 self._buttonFiling.setOuterRadius(self.BUTTON_RADIUS)
 515                 self._buttonArtist = PieArtist(self._buttonFiling)
 516                 self._poppedUp = False
 517
 518                 self._delayPopupTimer = QtCore.QTimer()
 519                 self._delayPopupTimer.setInterval(self.DELAY)
 520                 self._delayPopupTimer.setSingleShot(True)
 521                 self._delayPopupTimer.timeout.connect(self._on_delayed_popup)
 522                 self._popupLocation = None
 523
 524                 self._mousePosition = None
 525                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 526                 self.setSizePolicy(
 527                         QtGui.QSizePolicy(
 528                                 QtGui.QSizePolicy.MinimumExpanding,
 529                                 QtGui.QSizePolicy.MinimumExpanding,
 530                         )
 531                 )
 532
 533         def insertItem(self, item, index = -1):
 534                 self._filing.insertItem(item, index)
 535
 536         def removeItemAt(self, index):
 537                 self._filing.removeItemAt(index)
 538
 539         def set_center(self, item):
 540                 self._filing.set_center(item)
 541
 542         def set_button(self, item):
 543                 self.update()
 544
 545         def clear(self):
 546                 self._filing.clear()
 547
 548         def itemAt(self, index):
 549                 return self._filing.itemAt(index)
 550
 551         def indexAt(self, point):
 552                 return self._filing.indexAt(self._cachedCenterPosition, point)
 553
 554         def innerRadius(self):
 555                 return self._filing.innerRadius()
 556
 557         def setInnerRadius(self, radius):
 558                 self._filing.setInnerRadius(radius)
 559
 560         def outerRadius(self):
 561                 return self._filing.outerRadius()
 562
 563         def setOuterRadius(self, radius):
 564                 self._filing.setOuterRadius(radius)
 565
 566         def buttonRadius(self):
 567                 return self._buttonFiling.outerRadius()
 568
 569         def setButtonRadius(self, radius):
 570                 self._buttonFiling.setOuterRadius(radius)
 571                 self._buttonFiling.setInnerRadius(radius / 2)
 572                 self._buttonArtist.show(self.palette())
 573
 574         def minimumSizeHint(self):
 575                 return self._buttonArtist.centerSize()
 576
 577         @misc_utils.log_exception(_moduleLogger)
 578         def mousePressEvent(self, mouseEvent):
 579                 lastSelection = self._selectionIndex
 580
 581                 lastMousePos = mouseEvent.pos()
 582                 self._mousePosition = lastMousePos
 583                 self._update_selection(self._cachedCenterPosition)
 584
 585                 self.highlighted.emit(self._selectionIndex)
 586
 587                 self._display.selectAt(self._selectionIndex)
 588                 self._popupLocation = mouseEvent.globalPos()
 589                 self._delayPopupTimer.start()
 590
 591         @misc_utils.log_exception(_moduleLogger)
 592         def _on_delayed_popup(self):
 593                 assert self._popupLocation is not None, "Widget location abuse"
 594                 self._popup_child(self._popupLocation)
 595
 596         @misc_utils.log_exception(_moduleLogger)
 597         def mouseMoveEvent(self, mouseEvent):
 598                 lastSelection = self._selectionIndex
 599
 600                 lastMousePos = mouseEvent.pos()
 601                 if self._mousePosition is None:
 602                         # Absolute
 603                         self._update_selection(lastMousePos)
 604                 else:
 605                         # Relative
 606                         self._update_selection(
 607                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 608                                 ignoreOuter = True,
 609                         )
 610
 611                 if lastSelection != self._selectionIndex:
 612                         self.highlighted.emit(self._selectionIndex)
 613                         self._display.selectAt(self._selectionIndex)
 614
 615                 if self._selectionIndex != PieFiling.SELECTION_CENTER and self._delayPopupTimer.isActive():
 616                         self._on_delayed_popup()
 617
 618         @misc_utils.log_exception(_moduleLogger)
 619         def mouseReleaseEvent(self, mouseEvent):
 620                 self._delayPopupTimer.stop()
 621                 self._popupLocation = None
 622
 623                 lastSelection = self._selectionIndex
 624
 625                 lastMousePos = mouseEvent.pos()
 626                 if self._mousePosition is None:
 627                         # Absolute
 628                         self._update_selection(lastMousePos)
 629                 else:
 630                         # Relative
 631                         self._update_selection(
 632                                 self._cachedCenterPosition + (lastMousePos - self._mousePosition),
 633                                 ignoreOuter = True,
 634                         )
 635                 self._mousePosition = None
 636
 637                 self._activate_at(self._selectionIndex)
 638                 self._hide_child()
 639
 640         @misc_utils.log_exception(_moduleLogger)
 641         def keyPressEvent(self, keyEvent):
 642                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 643                         self._popup_child(QtGui.QCursor.pos())
 644                         if self._selectionIndex != len(self._filing) - 1:
 645                                 nextSelection = self._selectionIndex + 1
 646                         else:
 647                                 nextSelection = 0
 648                         self._select_at(nextSelection)
 649                         self._display.selectAt(self._selectionIndex)
 650                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 651                         self._popup_child(QtGui.QCursor.pos())
 652                         if 0 < self._selectionIndex:
 653                                 nextSelection = self._selectionIndex - 1
 654                         else:
 655                                 nextSelection = len(self._filing) - 1
 656                         self._select_at(nextSelection)
 657                         self._display.selectAt(self._selectionIndex)
 658                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 659                         self._popup_child(QtGui.QCursor.pos())
 660                         self._select_at(PieFiling.SELECTION_CENTER)
 661                         self._display.selectAt(self._selectionIndex)
 662                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 663                         self._delayPopupTimer.stop()
 664                         self._popupLocation = None
 665                         self._activate_at(self._selectionIndex)
 666                         self._hide_child()
 667                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 668                         self._delayPopupTimer.stop()
 669                         self._popupLocation = None
 670                         self._activate_at(PieFiling.SELECTION_NONE)
 671                         self._hide_child()
 672                 else:
 673                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 674
 675         @misc_utils.log_exception(_moduleLogger)
 676         def resizeEvent(self, resizeEvent):
 677                 self.setButtonRadius(min(resizeEvent.size().width(), resizeEvent.size().height()) / 2 - 1)
 678                 QtGui.QWidget.resizeEvent(self, resizeEvent)
 679
 680         @misc_utils.log_exception(_moduleLogger)
 681         def showEvent(self, showEvent):
 682                 self._buttonArtist.show(self.palette())
 683                 self._cachedCenterPosition = self.rect().center()
 684
 685                 QtGui.QWidget.showEvent(self, showEvent)
 686
 687         @misc_utils.log_exception(_moduleLogger)
 688         def hideEvent(self, hideEvent):
 689                 self._display.hide()
 690                 self._select_at(PieFiling.SELECTION_NONE)
 691                 QtGui.QWidget.hideEvent(self, hideEvent)
 692
 693         @misc_utils.log_exception(_moduleLogger)
 694         def paintEvent(self, paintEvent):
 695                 self.setButtonRadius(min(self.rect().width(), self.rect().height()) / 2 - 1)
 696                 if self._poppedUp:
 697                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_CENTER)
 698                 else:
 699                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_NONE)
 700                 offset = (self.size() - canvas.size()) / 2
 701
 702                 screen = QtGui.QPainter(self)
 703                 screen.drawPixmap(QtCore.QPoint(offset.width(), offset.height()), canvas)
 704
 705                 QtGui.QWidget.paintEvent(self, paintEvent)
 706
 707         def __iter__(self):
 708                 return iter(self._filing)
 709
 710         def __len__(self):
 711                 return len(self._filing)
 712
 713         def _popup_child(self, position):
 714                 self._poppedUp = True
 715                 self.aboutToShow.emit()
 716
 717                 self._delayPopupTimer.stop()
 718                 self._popupLocation = None
 719
 720                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 721                 self._display.move(position)
 722                 self._display.show()
 723
 724                 self.update()
 725
 726         def _hide_child(self):
 727                 self._poppedUp = False
 728                 self.aboutToHide.emit()
 729                 self._display.hide()
 730                 self.update()
 731
 732         def _select_at(self, index):
 733                 self._selectionIndex = index
 734
 735         def _update_selection(self, lastMousePos, ignoreOuter = False):
 736                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 737                 if radius < self._filing.innerRadius():
 738                         self._select_at(PieFiling.SELECTION_CENTER)
 739                 elif radius <= self._filing.outerRadius() or ignoreOuter:
 740                         self._select_at(self.indexAt(lastMousePos))
 741                 else:
 742                         self._select_at(PieFiling.SELECTION_NONE)
 743
 744         def _activate_at(self, index):
 745                 if index == PieFiling.SELECTION_NONE:
 746                         self.canceled.emit()
 747                         return
 748                 elif index == PieFiling.SELECTION_CENTER:
 749                         child = self._filing.center()
 750                 else:
 751                         child = self.itemAt(index)
 752
 753                 if child.action().isEnabled():
 754                         child.action().trigger()
 755                         self.activated.emit(index)
 756                 else:
 757                         self.canceled.emit()
 758
 759
 760 class QPieMenu(QtGui.QWidget):
 761
 762         activated = QtCore.pyqtSignal(int)
 763         highlighted = QtCore.pyqtSignal(int)
 764         canceled = QtCore.pyqtSignal()
 765         aboutToShow = QtCore.pyqtSignal()
 766         aboutToHide = QtCore.pyqtSignal()
 767
 768         def __init__(self, parent = None):
 769                 QtGui.QWidget.__init__(self, parent)
 770                 self._cachedCenterPosition = self.rect().center()
 771
 772                 self._filing = PieFiling()
 773                 self._artist = PieArtist(self._filing)
 774                 self._selectionIndex = PieFiling.SELECTION_NONE
 775
 776                 self._mousePosition = ()
 777                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 778
 779         def popup(self, pos):
 780                 self._update_selection(pos)
 781                 self.show()
 782
 783         def insertItem(self, item, index = -1):
 784                 self._filing.insertItem(item, index)
 785                 self.update()
 786
 787         def removeItemAt(self, index):
 788                 self._filing.removeItemAt(index)
 789                 self.update()
 790
 791         def set_center(self, item):
 792                 self._filing.set_center(item)
 793                 self.update()
 794
 795         def clear(self):
 796                 self._filing.clear()
 797                 self.update()
 798
 799         def itemAt(self, index):
 800                 return self._filing.itemAt(index)
 801
 802         def indexAt(self, point):
 803                 return self._filing.indexAt(self._cachedCenterPosition, point)
 804
 805         def innerRadius(self):
 806                 return self._filing.innerRadius()
 807
 808         def setInnerRadius(self, radius):
 809                 self._filing.setInnerRadius(radius)
 810                 self.update()
 811
 812         def outerRadius(self):
 813                 return self._filing.outerRadius()
 814
 815         def setOuterRadius(self, radius):
 816                 self._filing.setOuterRadius(radius)
 817                 self.update()
 818
 819         def sizeHint(self):
 820                 return self._artist.pieSize()
 821
 822         @misc_utils.log_exception(_moduleLogger)
 823         def mousePressEvent(self, mouseEvent):
 824                 lastSelection = self._selectionIndex
 825
 826                 lastMousePos = mouseEvent.pos()
 827                 self._update_selection(lastMousePos)
 828                 self._mousePosition = lastMousePos
 829
 830                 if lastSelection != self._selectionIndex:
 831                         self.highlighted.emit(self._selectionIndex)
 832                         self.update()
 833
 834         @misc_utils.log_exception(_moduleLogger)
 835         def mouseMoveEvent(self, mouseEvent):
 836                 lastSelection = self._selectionIndex
 837
 838                 lastMousePos = mouseEvent.pos()
 839                 self._update_selection(lastMousePos)
 840
 841                 if lastSelection != self._selectionIndex:
 842                         self.highlighted.emit(self._selectionIndex)
 843                         self.update()
 844
 845         @misc_utils.log_exception(_moduleLogger)
 846         def mouseReleaseEvent(self, mouseEvent):
 847                 lastSelection = self._selectionIndex
 848
 849                 lastMousePos = mouseEvent.pos()
 850                 self._update_selection(lastMousePos)
 851                 self._mousePosition = ()
 852
 853                 self._activate_at(self._selectionIndex)
 854                 self.update()
 855
 856         @misc_utils.log_exception(_moduleLogger)
 857         def keyPressEvent(self, keyEvent):
 858                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 859                         if self._selectionIndex != len(self._filing) - 1:
 860                                 nextSelection = self._selectionIndex + 1
 861                         else:
 862                                 nextSelection = 0
 863                         self._select_at(nextSelection)
 864                         self.update()
 865                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 866                         if 0 < self._selectionIndex:
 867                                 nextSelection = self._selectionIndex - 1
 868                         else:
 869                                 nextSelection = len(self._filing) - 1
 870                         self._select_at(nextSelection)
 871                         self.update()
 872                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 873                         self._activate_at(self._selectionIndex)
 874                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 875                         self._activate_at(PieFiling.SELECTION_NONE)
 876                 else:
 877                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 878
 879         @misc_utils.log_exception(_moduleLogger)
 880         def showEvent(self, showEvent):
 881                 self.aboutToShow.emit()
 882                 self._cachedCenterPosition = self.rect().center()
 883
 884                 mask = self._artist.show(self.palette())
 885                 self.setMask(mask)
 886
 887                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 888                 self._update_selection(lastMousePos)
 889
 890                 QtGui.QWidget.showEvent(self, showEvent)
 891
 892         @misc_utils.log_exception(_moduleLogger)
 893         def hideEvent(self, hideEvent):
 894                 self._artist.hide()
 895                 self._selectionIndex = PieFiling.SELECTION_NONE
 896                 QtGui.QWidget.hideEvent(self, hideEvent)
 897
 898         @misc_utils.log_exception(_moduleLogger)
 899         def paintEvent(self, paintEvent):
 900                 canvas = self._artist.paint(self._selectionIndex)
 901
 902                 screen = QtGui.QPainter(self)
 903                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 904
 905                 QtGui.QWidget.paintEvent(self, paintEvent)
 906
 907         def __iter__(self):
 908                 return iter(self._filing)
 909
 910         def __len__(self):
 911                 return len(self._filing)
 912
 913         def _select_at(self, index):
 914                 self._selectionIndex = index
 915
 916         def _update_selection(self, lastMousePos):
 917                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 918                 if radius < self._filing.innerRadius():
 919                         self._selectionIndex = PieFiling.SELECTION_CENTER
 920                 elif radius <= self._filing.outerRadius():
 921                         self._select_at(self.indexAt(lastMousePos))
 922                 else:
 923                         self._selectionIndex = PieFiling.SELECTION_NONE
 924
 925         def _activate_at(self, index):
 926                 if index == PieFiling.SELECTION_NONE:
 927                         self.canceled.emit()
 928                         self.aboutToHide.emit()
 929                         self.hide()
 930                         return
 931                 elif index == PieFiling.SELECTION_CENTER:
 932                         child = self._filing.center()
 933                 else:
 934                         child = self.itemAt(index)
 935
 936                 if child.isEnabled():
 937                         child.action().trigger()
 938                         self.activated.emit(index)
 939                 else:
 940                         self.canceled.emit()
 941                 self.aboutToHide.emit()
 942                 self.hide()
 943
 944
 945 def init_pies():
 946         PieFiling.NULL_CENTER.setEnabled(False)
 947
 948
 949 def _print(msg):
 950         print msg
 951
 952
 953 def _on_about_to_hide(app):
 954         app.exit()
 955
 956
 957 if __name__ == "__main__":
 958         app = QtGui.QApplication([])
 959         init_pies()
 960
 961         if False:
 962                 pie = QPieMenu()
 963                 pie.show()
 964
 965         if False:
 966                 singleAction = QtGui.QAction(None)
 967                 singleAction.setText("Boo")
 968                 singleItem = QActionPieItem(singleAction)
 969                 spie = QPieMenu()
 970                 spie.insertItem(singleItem)
 971                 spie.show()
 972
 973         if False:
 974                 oneAction = QtGui.QAction(None)
 975                 oneAction.setText("Chew")
 976                 oneItem = QActionPieItem(oneAction)
 977                 twoAction = QtGui.QAction(None)
 978                 twoAction.setText("Foo")
 979                 twoItem = QActionPieItem(twoAction)
 980                 iconTextAction = QtGui.QAction(None)
 981                 iconTextAction.setText("Icon")
 982                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 983                 iconTextItem = QActionPieItem(iconTextAction)
 984                 mpie = QPieMenu()
 985                 mpie.insertItem(oneItem)
 986                 mpie.insertItem(twoItem)
 987                 mpie.insertItem(oneItem)
 988                 mpie.insertItem(iconTextItem)
 989                 mpie.show()
 990
 991         if True:
 992                 oneAction = QtGui.QAction(None)
 993                 oneAction.setText("Chew")
 994                 oneAction.triggered.connect(lambda: _print("Chew"))
 995                 oneItem = QActionPieItem(oneAction)
 996                 twoAction = QtGui.QAction(None)
 997                 twoAction.setText("Foo")
 998                 twoAction.triggered.connect(lambda: _print("Foo"))
 999                 twoItem = QActionPieItem(twoAction)
1000                 iconAction = QtGui.QAction(None)
1001                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1002                 iconAction.triggered.connect(lambda: _print("Icon"))
1003                 iconItem = QActionPieItem(iconAction)
1004                 iconTextAction = QtGui.QAction(None)
1005                 iconTextAction.setText("Icon")
1006                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1007                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1008                 iconTextItem = QActionPieItem(iconTextAction)
1009                 mpie = QPieMenu()
1010                 mpie.set_center(iconItem)
1011                 mpie.insertItem(oneItem)
1012                 mpie.insertItem(twoItem)
1013                 mpie.insertItem(oneItem)
1014                 mpie.insertItem(iconTextItem)
1015                 mpie.show()
1016                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1017                 mpie.canceled.connect(lambda: _print("Canceled"))
1018
1019         if False:
1020                 oneAction = QtGui.QAction(None)
1021                 oneAction.setText("Chew")
1022                 oneAction.triggered.connect(lambda: _print("Chew"))
1023                 oneItem = QActionPieItem(oneAction)
1024                 twoAction = QtGui.QAction(None)
1025                 twoAction.setText("Foo")
1026                 twoAction.triggered.connect(lambda: _print("Foo"))
1027                 twoItem = QActionPieItem(twoAction)
1028                 iconAction = QtGui.QAction(None)
1029                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1030                 iconAction.triggered.connect(lambda: _print("Icon"))
1031                 iconItem = QActionPieItem(iconAction)
1032                 iconTextAction = QtGui.QAction(None)
1033                 iconTextAction.setText("Icon")
1034                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1035                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1036                 iconTextItem = QActionPieItem(iconTextAction)
1037                 pieFiling = PieFiling()
1038                 pieFiling.set_center(iconItem)
1039                 pieFiling.insertItem(oneItem)
1040                 pieFiling.insertItem(twoItem)
1041                 pieFiling.insertItem(oneItem)
1042                 pieFiling.insertItem(iconTextItem)
1043                 mpie = QPieDisplay(pieFiling)
1044                 mpie.show()
1045
1046         if False:
1047                 oneAction = QtGui.QAction(None)
1048                 oneAction.setText("Chew")
1049                 oneAction.triggered.connect(lambda: _print("Chew"))
1050                 oneItem = QActionPieItem(oneAction)
1051                 twoAction = QtGui.QAction(None)
1052                 twoAction.setText("Foo")
1053                 twoAction.triggered.connect(lambda: _print("Foo"))
1054                 twoItem = QActionPieItem(twoAction)
1055                 iconAction = QtGui.QAction(None)
1056                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1057                 iconAction.triggered.connect(lambda: _print("Icon"))
1058                 iconItem = QActionPieItem(iconAction)
1059                 iconTextAction = QtGui.QAction(None)
1060                 iconTextAction.setText("Icon")
1061                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1062                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1063                 iconTextItem = QActionPieItem(iconTextAction)
1064                 mpie = QPieButton(iconItem)
1065                 mpie.set_center(iconItem)
1066                 mpie.insertItem(oneItem)
1067                 mpie.insertItem(twoItem)
1068                 mpie.insertItem(oneItem)
1069                 mpie.insertItem(iconTextItem)
1070                 mpie.show()
1071                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1072                 mpie.canceled.connect(lambda: _print("Canceled"))
1073
1074         app.exec_()