git.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                 self._selectionIndex = index
 472                 self.update()
 473
 474
 475 class QPieButton(QtGui.QWidget):
 476
 477         activated = QtCore.pyqtSignal(int)
 478         highlighted = QtCore.pyqtSignal(int)
 479         canceled = QtCore.pyqtSignal()
 480         aboutToShow = QtCore.pyqtSignal()
 481         aboutToHide = QtCore.pyqtSignal()
 482
 483         def __init__(self, buttonSlice, parent = None):
 484                 QtGui.QWidget.__init__(self, parent)
 485                 self._cachedCenterPosition = self.rect().center()
 486
 487                 self._filing = PieFiling()
 488                 self._display = QPieDisplay(self._filing, None, QtCore.Qt.SplashScreen)
 489                 self._selectionIndex = PieFiling.SELECTION_NONE
 490
 491                 self._buttonFiling = PieFiling()
 492                 self._buttonFiling.set_center(buttonSlice)
 493                 self._buttonArtist = PieArtist(self._buttonFiling)
 494                 centerSize = self._buttonArtist.centerSize()
 495                 self._buttonFiling.setOuterRadius(max(centerSize.width(), centerSize.height()))
 496                 self._poppedUp = False
 497
 498                 self._mousePosition = None
 499                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 500
 501         def insertItem(self, item, index = -1):
 502                 self._filing.insertItem(item, index)
 503
 504         def removeItemAt(self, index):
 505                 self._filing.removeItemAt(index)
 506
 507         def set_center(self, item):
 508                 self._filing.set_center(item)
 509
 510         def set_button(self, item):
 511                 self.update()
 512
 513         def clear(self):
 514                 self._filing.clear()
 515
 516         def itemAt(self, index):
 517                 return self._filing.itemAt(index)
 518
 519         def indexAt(self, point):
 520                 return self._filing.indexAt(self._cachedCenterPosition, point)
 521
 522         def innerRadius(self):
 523                 return self._filing.innerRadius()
 524
 525         def setInnerRadius(self, radius):
 526                 self._filing.setInnerRadius(radius)
 527
 528         def outerRadius(self):
 529                 return self._filing.outerRadius()
 530
 531         def setOuterRadius(self, radius):
 532                 self._filing.setOuterRadius(radius)
 533
 534         def sizeHint(self):
 535                 return self._buttonArtist.pieSize()
 536
 537         @misc_utils.log_exception(_moduleLogger)
 538         def mousePressEvent(self, mouseEvent):
 539                 self._popup_child(mouseEvent.globalPos())
 540                 lastSelection = self._selectionIndex
 541
 542                 lastMousePos = mouseEvent.pos()
 543                 self._mousePosition = lastMousePos
 544                 self._update_selection(self._cachedCenterPosition)
 545
 546                 if lastSelection != self._selectionIndex:
 547                         self.highlighted.emit(self._selectionIndex)
 548                         self._display.selectAt(self._selectionIndex)
 549
 550         @misc_utils.log_exception(_moduleLogger)
 551         def mouseMoveEvent(self, mouseEvent):
 552                 lastSelection = self._selectionIndex
 553
 554                 lastMousePos = mouseEvent.pos()
 555                 if self._mousePosition is None:
 556                         # Absolute
 557                         self._update_selection(lastMousePos)
 558                 else:
 559                         # Relative
 560                         self._update_selection(self._cachedCenterPosition + (lastMousePos - self._mousePosition))
 561
 562                 if lastSelection != self._selectionIndex:
 563                         self.highlighted.emit(self._selectionIndex)
 564                         self._display.selectAt(self._selectionIndex)
 565
 566         @misc_utils.log_exception(_moduleLogger)
 567         def mouseReleaseEvent(self, mouseEvent):
 568                 lastSelection = self._selectionIndex
 569
 570                 lastMousePos = mouseEvent.pos()
 571                 if self._mousePosition is None:
 572                         # Absolute
 573                         self._update_selection(lastMousePos)
 574                 else:
 575                         # Relative
 576                         self._update_selection(self._cachedCenterPosition + (lastMousePos - self._mousePosition))
 577                 self._mousePosition = None
 578
 579                 self._activate_at(self._selectionIndex)
 580                 self._hide_child()
 581
 582         @misc_utils.log_exception(_moduleLogger)
 583         def keyPressEvent(self, keyEvent):
 584                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 585                         self._popup_child(QtGui.QCursor.pos())
 586                         if self._selectionIndex != len(self._filing) - 1:
 587                                 nextSelection = self._selectionIndex + 1
 588                         else:
 589                                 nextSelection = 0
 590                         self._select_at(nextSelection)
 591                         self._display.selectAt(self._selectionIndex)
 592                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 593                         self._popup_child(QtGui.QCursor.pos())
 594                         if 0 < self._selectionIndex:
 595                                 nextSelection = self._selectionIndex - 1
 596                         else:
 597                                 nextSelection = len(self._filing) - 1
 598                         self._select_at(nextSelection)
 599                         self._display.selectAt(self._selectionIndex)
 600                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 601                         self._popup_child(QtGui.QCursor.pos())
 602                         self._select_at(PieFiling.SELECTION_CENTER)
 603                         self._display.selectAt(self._selectionIndex)
 604                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 605                         self._activate_at(self._selectionIndex)
 606                         self._hide_child()
 607                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 608                         self._activate_at(PieFiling.SELECTION_NONE)
 609                         self._hide_child()
 610                 else:
 611                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 612
 613         @misc_utils.log_exception(_moduleLogger)
 614         def showEvent(self, showEvent):
 615                 self._buttonFiling.setOuterRadius(max(self.size().width(), self.size().height()) / 2)
 616                 self._buttonArtist.show(self.palette())
 617                 self._cachedCenterPosition = self.rect().center()
 618
 619                 QtGui.QWidget.showEvent(self, showEvent)
 620
 621         @misc_utils.log_exception(_moduleLogger)
 622         def hideEvent(self, hideEvent):
 623                 self._display.hide()
 624                 self._select_at(PieFiling.SELECTION_NONE)
 625                 QtGui.QWidget.hideEvent(self, hideEvent)
 626
 627         @misc_utils.log_exception(_moduleLogger)
 628         def paintEvent(self, paintEvent):
 629                 if self._poppedUp:
 630                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_CENTER)
 631                 else:
 632                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_NONE)
 633
 634                 screen = QtGui.QPainter(self)
 635                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 636
 637                 QtGui.QWidget.paintEvent(self, paintEvent)
 638
 639         def __iter__(self):
 640                 return iter(self._filing)
 641
 642         def __len__(self):
 643                 return len(self._filing)
 644
 645         def _popup_child(self, position):
 646                 self._poppedUp = True
 647                 self.aboutToShow.emit()
 648
 649                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 650                 self._display.move(position)
 651                 self._display.show()
 652
 653                 self.update()
 654
 655         def _hide_child(self):
 656                 self._poppedUp = False
 657                 self.aboutToHide.emit()
 658                 self._display.hide()
 659                 self.update()
 660
 661         def _select_at(self, index):
 662                 self._selectionIndex = index
 663
 664         def _update_selection(self, lastMousePos):
 665                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 666                 if radius < self._filing.innerRadius():
 667                         self._select_at(PieFiling.SELECTION_CENTER)
 668                 elif radius <= self._filing.outerRadius():
 669                         self._select_at(self.indexAt(lastMousePos))
 670                 else:
 671                         self._select_at(PieFiling.SELECTION_NONE)
 672
 673         def _activate_at(self, index):
 674                 if index == PieFiling.SELECTION_NONE:
 675                         self.canceled.emit()
 676                         return
 677                 elif index == PieFiling.SELECTION_CENTER:
 678                         child = self._filing.center()
 679                 else:
 680                         child = self.itemAt(index)
 681
 682                 if child.action().isEnabled():
 683                         child.action().trigger()
 684                         self.activated.emit(index)
 685                 else:
 686                         self.canceled.emit()
 687
 688
 689 class QPieMenu(QtGui.QWidget):
 690
 691         activated = QtCore.pyqtSignal(int)
 692         highlighted = QtCore.pyqtSignal(int)
 693         canceled = QtCore.pyqtSignal()
 694         aboutToShow = QtCore.pyqtSignal()
 695         aboutToHide = QtCore.pyqtSignal()
 696
 697         def __init__(self, parent = None):
 698                 QtGui.QWidget.__init__(self, parent)
 699                 self._cachedCenterPosition = self.rect().center()
 700
 701                 self._filing = PieFiling()
 702                 self._artist = PieArtist(self._filing)
 703                 self._selectionIndex = PieFiling.SELECTION_NONE
 704
 705                 self._mousePosition = ()
 706                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 707
 708         def popup(self, pos):
 709                 self._update_selection(pos)
 710                 self.show()
 711
 712         def insertItem(self, item, index = -1):
 713                 self._filing.insertItem(item, index)
 714                 self.update()
 715
 716         def removeItemAt(self, index):
 717                 self._filing.removeItemAt(index)
 718                 self.update()
 719
 720         def set_center(self, item):
 721                 self._filing.set_center(item)
 722                 self.update()
 723
 724         def clear(self):
 725                 self._filing.clear()
 726                 self.update()
 727
 728         def itemAt(self, index):
 729                 return self._filing.itemAt(index)
 730
 731         def indexAt(self, point):
 732                 return self._filing.indexAt(self._cachedCenterPosition, point)
 733
 734         def innerRadius(self):
 735                 return self._filing.innerRadius()
 736
 737         def setInnerRadius(self, radius):
 738                 self._filing.setInnerRadius(radius)
 739                 self.update()
 740
 741         def outerRadius(self):
 742                 return self._filing.outerRadius()
 743
 744         def setOuterRadius(self, radius):
 745                 self._filing.setOuterRadius(radius)
 746                 self.update()
 747
 748         def sizeHint(self):
 749                 return self._artist.pieSize()
 750
 751         @misc_utils.log_exception(_moduleLogger)
 752         def mousePressEvent(self, mouseEvent):
 753                 lastSelection = self._selectionIndex
 754
 755                 lastMousePos = mouseEvent.pos()
 756                 self._update_selection(lastMousePos)
 757                 self._mousePosition = lastMousePos
 758
 759                 if lastSelection != self._selectionIndex:
 760                         self.highlighted.emit(self._selectionIndex)
 761                         self.update()
 762
 763         @misc_utils.log_exception(_moduleLogger)
 764         def mouseMoveEvent(self, mouseEvent):
 765                 lastSelection = self._selectionIndex
 766
 767                 lastMousePos = mouseEvent.pos()
 768                 self._update_selection(lastMousePos)
 769
 770                 if lastSelection != self._selectionIndex:
 771                         self.highlighted.emit(self._selectionIndex)
 772                         self.update()
 773
 774         @misc_utils.log_exception(_moduleLogger)
 775         def mouseReleaseEvent(self, mouseEvent):
 776                 lastSelection = self._selectionIndex
 777
 778                 lastMousePos = mouseEvent.pos()
 779                 self._update_selection(lastMousePos)
 780                 self._mousePosition = ()
 781
 782                 self._activate_at(self._selectionIndex)
 783                 self.update()
 784
 785         @misc_utils.log_exception(_moduleLogger)
 786         def keyPressEvent(self, keyEvent):
 787                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 788                         if self._selectionIndex != len(self._filing) - 1:
 789                                 nextSelection = self._selectionIndex + 1
 790                         else:
 791                                 nextSelection = 0
 792                         self._select_at(nextSelection)
 793                         self.update()
 794                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 795                         if 0 < self._selectionIndex:
 796                                 nextSelection = self._selectionIndex - 1
 797                         else:
 798                                 nextSelection = len(self._filing) - 1
 799                         self._select_at(nextSelection)
 800                         self.update()
 801                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 802                         self._activate_at(self._selectionIndex)
 803                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 804                         self._activate_at(PieFiling.SELECTION_NONE)
 805                 else:
 806                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 807
 808         @misc_utils.log_exception(_moduleLogger)
 809         def showEvent(self, showEvent):
 810                 self.aboutToShow.emit()
 811                 self._cachedCenterPosition = self.rect().center()
 812
 813                 mask = self._artist.show(self.palette())
 814                 self.setMask(mask)
 815
 816                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 817                 self._update_selection(lastMousePos)
 818
 819                 QtGui.QWidget.showEvent(self, showEvent)
 820
 821         @misc_utils.log_exception(_moduleLogger)
 822         def hideEvent(self, hideEvent):
 823                 self._artist.hide()
 824                 self._selectionIndex = PieFiling.SELECTION_NONE
 825                 QtGui.QWidget.hideEvent(self, hideEvent)
 826
 827         @misc_utils.log_exception(_moduleLogger)
 828         def paintEvent(self, paintEvent):
 829                 canvas = self._artist.paint(self._selectionIndex)
 830
 831                 screen = QtGui.QPainter(self)
 832                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 833
 834                 QtGui.QWidget.paintEvent(self, paintEvent)
 835
 836         def __iter__(self):
 837                 return iter(self._filing)
 838
 839         def __len__(self):
 840                 return len(self._filing)
 841
 842         def _select_at(self, index):
 843                 self._selectionIndex = index
 844
 845         def _update_selection(self, lastMousePos):
 846                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 847                 if radius < self._filing.innerRadius():
 848                         self._selectionIndex = PieFiling.SELECTION_CENTER
 849                 elif radius <= self._filing.outerRadius():
 850                         self._select_at(self.indexAt(lastMousePos))
 851                 else:
 852                         self._selectionIndex = PieFiling.SELECTION_NONE
 853
 854         def _activate_at(self, index):
 855                 if index == PieFiling.SELECTION_NONE:
 856                         self.canceled.emit()
 857                         self.aboutToHide.emit()
 858                         self.hide()
 859                         return
 860                 elif index == PieFiling.SELECTION_CENTER:
 861                         child = self._filing.center()
 862                 else:
 863                         child = self.itemAt(index)
 864
 865                 if child.isEnabled():
 866                         child.action().trigger()
 867                         self.activated.emit(index)
 868                 else:
 869                         self.canceled.emit()
 870                 self.aboutToHide.emit()
 871                 self.hide()
 872
 873
 874 def init_pies():
 875         PieFiling.NULL_CENTER.setEnabled(False)
 876
 877
 878 def _print(msg):
 879         print msg
 880
 881
 882 def _on_about_to_hide(app):
 883         app.exit()
 884
 885
 886 if __name__ == "__main__":
 887         app = QtGui.QApplication([])
 888         init_pies()
 889
 890         if False:
 891                 pie = QPieMenu()
 892                 pie.show()
 893
 894         if False:
 895                 singleAction = QtGui.QAction(None)
 896                 singleAction.setText("Boo")
 897                 singleItem = QActionPieItem(singleAction)
 898                 spie = QPieMenu()
 899                 spie.insertItem(singleItem)
 900                 spie.show()
 901
 902         if False:
 903                 oneAction = QtGui.QAction(None)
 904                 oneAction.setText("Chew")
 905                 oneItem = QActionPieItem(oneAction)
 906                 twoAction = QtGui.QAction(None)
 907                 twoAction.setText("Foo")
 908                 twoItem = QActionPieItem(twoAction)
 909                 iconTextAction = QtGui.QAction(None)
 910                 iconTextAction.setText("Icon")
 911                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 912                 iconTextItem = QActionPieItem(iconTextAction)
 913                 mpie = QPieMenu()
 914                 mpie.insertItem(oneItem)
 915                 mpie.insertItem(twoItem)
 916                 mpie.insertItem(oneItem)
 917                 mpie.insertItem(iconTextItem)
 918                 mpie.show()
 919
 920         if True:
 921                 oneAction = QtGui.QAction(None)
 922                 oneAction.setText("Chew")
 923                 oneAction.triggered.connect(lambda: _print("Chew"))
 924                 oneItem = QActionPieItem(oneAction)
 925                 twoAction = QtGui.QAction(None)
 926                 twoAction.setText("Foo")
 927                 twoAction.triggered.connect(lambda: _print("Foo"))
 928                 twoItem = QActionPieItem(twoAction)
 929                 iconAction = QtGui.QAction(None)
 930                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 931                 iconAction.triggered.connect(lambda: _print("Icon"))
 932                 iconItem = QActionPieItem(iconAction)
 933                 iconTextAction = QtGui.QAction(None)
 934                 iconTextAction.setText("Icon")
 935                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 936                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
 937                 iconTextItem = QActionPieItem(iconTextAction)
 938                 mpie = QPieMenu()
 939                 mpie.set_center(iconItem)
 940                 mpie.insertItem(oneItem)
 941                 mpie.insertItem(twoItem)
 942                 mpie.insertItem(oneItem)
 943                 mpie.insertItem(iconTextItem)
 944                 mpie.show()
 945                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
 946                 mpie.canceled.connect(lambda: _print("Canceled"))
 947
 948         if False:
 949                 oneAction = QtGui.QAction(None)
 950                 oneAction.setText("Chew")
 951                 oneAction.triggered.connect(lambda: _print("Chew"))
 952                 oneItem = QActionPieItem(oneAction)
 953                 twoAction = QtGui.QAction(None)
 954                 twoAction.setText("Foo")
 955                 twoAction.triggered.connect(lambda: _print("Foo"))
 956                 twoItem = QActionPieItem(twoAction)
 957                 iconAction = QtGui.QAction(None)
 958                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 959                 iconAction.triggered.connect(lambda: _print("Icon"))
 960                 iconItem = QActionPieItem(iconAction)
 961                 iconTextAction = QtGui.QAction(None)
 962                 iconTextAction.setText("Icon")
 963                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 964                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
 965                 iconTextItem = QActionPieItem(iconTextAction)
 966                 pieFiling = PieFiling()
 967                 pieFiling.set_center(iconItem)
 968                 pieFiling.insertItem(oneItem)
 969                 pieFiling.insertItem(twoItem)
 970                 pieFiling.insertItem(oneItem)
 971                 pieFiling.insertItem(iconTextItem)
 972                 mpie = QPieDisplay(pieFiling)
 973                 mpie.show()
 974
 975         if False:
 976                 oneAction = QtGui.QAction(None)
 977                 oneAction.setText("Chew")
 978                 oneAction.triggered.connect(lambda: _print("Chew"))
 979                 oneItem = QActionPieItem(oneAction)
 980                 twoAction = QtGui.QAction(None)
 981                 twoAction.setText("Foo")
 982                 twoAction.triggered.connect(lambda: _print("Foo"))
 983                 twoItem = QActionPieItem(twoAction)
 984                 iconAction = QtGui.QAction(None)
 985                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 986                 iconAction.triggered.connect(lambda: _print("Icon"))
 987                 iconItem = QActionPieItem(iconAction)
 988                 iconTextAction = QtGui.QAction(None)
 989                 iconTextAction.setText("Icon")
 990                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 991                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
 992                 iconTextItem = QActionPieItem(iconTextAction)
 993                 mpie = QPieButton(iconItem)
 994                 mpie.set_center(iconItem)
 995                 mpie.insertItem(oneItem)
 996                 mpie.insertItem(twoItem)
 997                 mpie.insertItem(oneItem)
 998                 mpie.insertItem(iconTextItem)
 999                 mpie.show()
1000                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1001                 mpie.canceled.connect(lambda: _print("Canceled"))
1002
1003         app.exec_()