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                 # @bug The wrong text is being using on unselected pie menus
 199                 # @bug Plus it would be a good idea to fill in the icon body's
 200                 # @bug Maybe even make the icons glow?
 201                 self._filing = filing
 202
 203                 self._cachedOuterRadius = self._filing.outerRadius()
 204                 self._cachedInnerRadius = self._filing.innerRadius()
 205                 canvasSize = self._cachedOuterRadius * 2 + 1
 206                 self._canvas = QtGui.QPixmap(canvasSize, canvasSize)
 207                 self._mask = None
 208                 self.palette = None
 209
 210         def pieSize(self):
 211                 diameter = self._filing.outerRadius() * 2 + 1
 212                 return QtCore.QSize(diameter, diameter)
 213
 214         def centerSize(self):
 215                 painter = QtGui.QPainter(self._canvas)
 216                 text = self._filing.center().action().text()
 217                 fontMetrics = painter.fontMetrics()
 218                 if text:
 219                         textBoundingRect = fontMetrics.boundingRect(text)
 220                 else:
 221                         textBoundingRect = QtCore.QRect()
 222                 textWidth = textBoundingRect.width()
 223                 textHeight = textBoundingRect.height()
 224
 225                 return QtCore.QSize(
 226                         textWidth + self.ICON_SIZE_DEFAULT,
 227                         max(textHeight, self.ICON_SIZE_DEFAULT),
 228                 )
 229
 230         def show(self, palette):
 231                 self.palette = palette
 232
 233                 if (
 234                         self._cachedOuterRadius != self._filing.outerRadius() or
 235                         self._cachedInnerRadius != self._filing.innerRadius()
 236                 ):
 237                         self._cachedOuterRadius = self._filing.outerRadius()
 238                         self._cachedInnerRadius = self._filing.innerRadius()
 239                         self._canvas = self._canvas.scaled(self.pieSize())
 240
 241                 if self._mask is None:
 242                         self._mask = QtGui.QBitmap(self._canvas.size())
 243                         self._mask.fill(QtCore.Qt.color0)
 244                         self._generate_mask(self._mask)
 245                         self._canvas.setMask(self._mask)
 246                 return self._mask
 247
 248         def hide(self):
 249                 self.palette = None
 250
 251         def paint(self, selectionIndex):
 252                 painter = QtGui.QPainter(self._canvas)
 253                 painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
 254
 255                 adjustmentRect = self._canvas.rect().adjusted(0, 0, -1, -1)
 256
 257                 numChildren = len(self._filing)
 258                 if numChildren == 0:
 259                         if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 260                                 painter.setBrush(self.palette.highlight())
 261                         else:
 262                                 painter.setBrush(self.palette.background())
 263                         painter.setPen(self.palette.mid().color())
 264
 265                         painter.drawRect(self._canvas.rect())
 266                         self._paint_center_foreground(painter, selectionIndex)
 267                         return self._canvas
 268                 elif numChildren == 1:
 269                         if selectionIndex == 0 and self._filing[0].isEnabled():
 270                                 painter.setBrush(self.palette.highlight())
 271                         else:
 272                                 painter.setBrush(self.palette.background())
 273
 274                         painter.fillRect(self._canvas.rect(), painter.brush())
 275                 else:
 276                         for i in xrange(len(self._filing)):
 277                                 self._paint_slice_background(painter, adjustmentRect, i, selectionIndex)
 278
 279                 self._paint_center_background(painter, adjustmentRect, selectionIndex)
 280                 self._paint_center_foreground(painter, selectionIndex)
 281
 282                 for i in xrange(len(self._filing)):
 283                         self._paint_slice_foreground(painter, i, selectionIndex)
 284
 285                 return self._canvas
 286
 287         def _generate_mask(self, mask):
 288                 """
 289                 Specifies on the mask the shape of the pie menu
 290                 """
 291                 painter = QtGui.QPainter(mask)
 292                 painter.setPen(QtCore.Qt.color1)
 293                 painter.setBrush(QtCore.Qt.color1)
 294                 painter.drawEllipse(mask.rect().adjusted(0, 0, -1, -1))
 295
 296         def _paint_slice_background(self, painter, adjustmentRect, i, selectionIndex):
 297                 if i == selectionIndex and self._filing[i].isEnabled():
 298                         painter.setBrush(self.palette.highlight())
 299                 else:
 300                         painter.setBrush(self.palette.background())
 301                 painter.setPen(self.palette.mid().color())
 302
 303                 a = self._filing._index_to_angle(i, True)
 304                 b = self._filing._index_to_angle(i + 1, True)
 305                 if b < a:
 306                         b += _TWOPI
 307                 size = b - a
 308                 if size < 0:
 309                         size += _TWOPI
 310
 311                 startAngleInDeg = (a * 360 * 16) / _TWOPI
 312                 sizeInDeg = (size * 360 * 16) / _TWOPI
 313                 painter.drawPie(adjustmentRect, int(startAngleInDeg), int(sizeInDeg))
 314
 315         def _paint_slice_foreground(self, painter, i, selectionIndex):
 316                 child = self._filing[i]
 317
 318                 a = self._filing._index_to_angle(i, True)
 319                 b = self._filing._index_to_angle(i + 1, True)
 320                 if b < a:
 321                         b += _TWOPI
 322                 middleAngle = (a + b) / 2
 323                 averageRadius = (self._cachedInnerRadius + self._cachedOuterRadius) / 2
 324
 325                 sliceX = averageRadius * math.cos(middleAngle)
 326                 sliceY = - averageRadius * math.sin(middleAngle)
 327
 328                 piePos = self._canvas.rect().center()
 329                 pieX = piePos.x()
 330                 pieY = piePos.y()
 331                 self._paint_label(
 332                         painter, child.action(), i == selectionIndex, pieX+sliceX, pieY+sliceY
 333                 )
 334
 335         def _paint_label(self, painter, action, isSelected, x, y):
 336                 text = action.text()
 337                 fontMetrics = painter.fontMetrics()
 338                 if text:
 339                         textBoundingRect = fontMetrics.boundingRect(text)
 340                 else:
 341                         textBoundingRect = QtCore.QRect()
 342                 textWidth = textBoundingRect.width()
 343                 textHeight = textBoundingRect.height()
 344
 345                 icon = action.icon().pixmap(
 346                         QtCore.QSize(self.ICON_SIZE_DEFAULT, self.ICON_SIZE_DEFAULT),
 347                         QtGui.QIcon.Normal,
 348                         QtGui.QIcon.On,
 349                 )
 350                 iconWidth = icon.width()
 351                 iconHeight = icon.width()
 352                 averageWidth = (iconWidth + textWidth)/2
 353                 if not icon.isNull():
 354                         iconRect = QtCore.QRect(
 355                                 x - averageWidth,
 356                                 y - iconHeight/2,
 357                                 iconWidth,
 358                                 iconHeight,
 359                         )
 360
 361                         painter.drawPixmap(iconRect, icon)
 362
 363                 if text:
 364                         if isSelected:
 365                                 if action.isEnabled():
 366                                         pen = self.palette.highlightedText()
 367                                         brush = self.palette.highlight()
 368                                 else:
 369                                         pen = self.palette.mid()
 370                                         brush = self.palette.background()
 371                         else:
 372                                 if action.isEnabled():
 373                                         pen = self.palette.text()
 374                                 else:
 375                                         pen = self.palette.mid()
 376                                 brush = self.palette.background()
 377
 378                         leftX = x - averageWidth + iconWidth
 379                         topY = y + textHeight/2
 380                         painter.setPen(pen.color())
 381                         painter.setBrush(brush)
 382                         painter.drawText(leftX, topY, text)
 383
 384         def _paint_center_background(self, painter, adjustmentRect, selectionIndex):
 385                 dark = self.palette.dark().color()
 386                 light = self.palette.light().color()
 387                 if selectionIndex == PieFiling.SELECTION_CENTER and self._filing.center().isEnabled():
 388                         background = self.palette.highlight().color()
 389                 else:
 390                         background = self.palette.background().color()
 391
 392                 innerRadius = self._cachedInnerRadius
 393                 adjustmentCenterPos = adjustmentRect.center()
 394                 innerRect = QtCore.QRect(
 395                         adjustmentCenterPos.x() - innerRadius,
 396                         adjustmentCenterPos.y() - innerRadius,
 397                         innerRadius * 2 + 1,
 398                         innerRadius * 2 + 1,
 399                 )
 400
 401                 painter.setPen(QtCore.Qt.NoPen)
 402                 painter.setBrush(background)
 403                 painter.drawPie(innerRect, 0, 360 * 16)
 404
 405                 painter.setPen(QtGui.QPen(dark, 1))
 406                 painter.setBrush(QtCore.Qt.NoBrush)
 407                 painter.drawEllipse(innerRect)
 408
 409                 painter.setPen(QtGui.QPen(dark, 1))
 410                 painter.setBrush(QtCore.Qt.NoBrush)
 411                 painter.drawEllipse(adjustmentRect)
 412
 413                 r = QtCore.QRect(innerRect)
 414                 innerCenter = r.center()
 415                 innerRect.setLeft(innerCenter.x() + ((r.left() - innerCenter.x()) / 3) * 1)
 416                 innerRect.setRight(innerCenter.x() + ((r.right() - innerCenter.x()) / 3) * 1)
 417                 innerRect.setTop(innerCenter.y() + ((r.top() - innerCenter.y()) / 3) * 1)
 418                 innerRect.setBottom(innerCenter.y() + ((r.bottom() - innerCenter.y()) / 3) * 1)
 419
 420         def _paint_center_foreground(self, painter, selectionIndex):
 421                 centerPos = self._canvas.rect().center()
 422                 pieX = centerPos.x()
 423                 pieY = centerPos.y()
 424
 425                 x = pieX
 426                 y = pieY
 427
 428                 self._paint_label(
 429                         painter,
 430                         self._filing.center().action(),
 431                         selectionIndex == PieFiling.SELECTION_CENTER,
 432                         x, y
 433                 )
 434
 435
 436 class QPieDisplay(QtGui.QWidget):
 437
 438         def __init__(self, filing, parent = None, flags = QtCore.Qt.Window):
 439                 QtGui.QWidget.__init__(self, parent, flags)
 440                 self._filing = filing
 441                 self._artist = PieArtist(self._filing)
 442                 self._selectionIndex = PieFiling.SELECTION_NONE
 443
 444         def popup(self, pos):
 445                 self._update_selection(pos)
 446                 self.show()
 447
 448         def sizeHint(self):
 449                 return self._artist.pieSize()
 450
 451         @misc_utils.log_exception(_moduleLogger)
 452         def showEvent(self, showEvent):
 453                 mask = self._artist.show(self.palette())
 454                 self.setMask(mask)
 455
 456                 QtGui.QWidget.showEvent(self, showEvent)
 457
 458         @misc_utils.log_exception(_moduleLogger)
 459         def hideEvent(self, hideEvent):
 460                 self._artist.hide()
 461                 self._selectionIndex = PieFiling.SELECTION_NONE
 462                 QtGui.QWidget.hideEvent(self, hideEvent)
 463
 464         @misc_utils.log_exception(_moduleLogger)
 465         def paintEvent(self, paintEvent):
 466                 canvas = self._artist.paint(self._selectionIndex)
 467
 468                 screen = QtGui.QPainter(self)
 469                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 470
 471                 QtGui.QWidget.paintEvent(self, paintEvent)
 472
 473         def selectAt(self, index):
 474                 oldIndex = self._selectionIndex
 475                 self._selectionIndex = index
 476                 if self.isVisible():
 477                         self.update()
 478
 479
 480 class QPieButton(QtGui.QWidget):
 481
 482         activated = QtCore.pyqtSignal(int)
 483         highlighted = QtCore.pyqtSignal(int)
 484         canceled = QtCore.pyqtSignal()
 485         aboutToShow = QtCore.pyqtSignal()
 486         aboutToHide = QtCore.pyqtSignal()
 487
 488         BUTTON_RADIUS = 24
 489         DELAY = 250
 490
 491         def __init__(self, buttonSlice, parent = None):
 492                 QtGui.QWidget.__init__(self, parent)
 493                 self._cachedCenterPosition = self.rect().center()
 494
 495                 self._filing = PieFiling()
 496                 self._display = QPieDisplay(self._filing, None, QtCore.Qt.SplashScreen)
 497                 self._selectionIndex = PieFiling.SELECTION_NONE
 498
 499                 self._buttonFiling = PieFiling()
 500                 self._buttonFiling.set_center(buttonSlice)
 501                 # @todo Figure out how to make the button auto-fill to content
 502                 self._buttonFiling.setOuterRadius(self.BUTTON_RADIUS)
 503                 self._buttonArtist = PieArtist(self._buttonFiling)
 504                 self._poppedUp = False
 505
 506                 self._delayPopupTimer = QtCore.QTimer()
 507                 self._delayPopupTimer.setInterval(self.DELAY)
 508                 self._delayPopupTimer.setSingleShot(True)
 509                 self._delayPopupTimer.timeout.connect(self._on_delayed_popup)
 510                 self._popupLocation = None
 511
 512                 self._mousePosition = None
 513                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 514
 515         def insertItem(self, item, index = -1):
 516                 self._filing.insertItem(item, index)
 517
 518         def removeItemAt(self, index):
 519                 self._filing.removeItemAt(index)
 520
 521         def set_center(self, item):
 522                 self._filing.set_center(item)
 523
 524         def set_button(self, item):
 525                 self.update()
 526
 527         def clear(self):
 528                 self._filing.clear()
 529
 530         def itemAt(self, index):
 531                 return self._filing.itemAt(index)
 532
 533         def indexAt(self, point):
 534                 return self._filing.indexAt(self._cachedCenterPosition, point)
 535
 536         def innerRadius(self):
 537                 return self._filing.innerRadius()
 538
 539         def setInnerRadius(self, radius):
 540                 self._filing.setInnerRadius(radius)
 541
 542         def outerRadius(self):
 543                 return self._filing.outerRadius()
 544
 545         def setOuterRadius(self, radius):
 546                 self._filing.setOuterRadius(radius)
 547
 548         def buttonRadius(self):
 549                 return self._buttonFiling.outerRadius()
 550
 551         def setButtonRadius(self, radius):
 552                 self._buttonFiling.setOuterRadius(radius)
 553
 554         def sizeHint(self):
 555                 return self._buttonArtist.pieSize()
 556
 557         @misc_utils.log_exception(_moduleLogger)
 558         def mousePressEvent(self, mouseEvent):
 559                 lastSelection = self._selectionIndex
 560
 561                 lastMousePos = mouseEvent.pos()
 562                 self._mousePosition = lastMousePos
 563                 self._update_selection(self._cachedCenterPosition)
 564
 565                 self.highlighted.emit(self._selectionIndex)
 566
 567                 self._display.selectAt(self._selectionIndex)
 568                 self._popupLocation = mouseEvent.globalPos()
 569                 self._delayPopupTimer.start()
 570
 571         @misc_utils.log_exception(_moduleLogger)
 572         def _on_delayed_popup(self):
 573                 assert self._popupLocation is not None
 574                 self._popup_child(self._popupLocation)
 575
 576         @misc_utils.log_exception(_moduleLogger)
 577         def mouseMoveEvent(self, mouseEvent):
 578                 lastSelection = self._selectionIndex
 579
 580                 lastMousePos = mouseEvent.pos()
 581                 if self._mousePosition is None:
 582                         # Absolute
 583                         self._update_selection(lastMousePos)
 584                 else:
 585                         # Relative
 586                         self._update_selection(self._cachedCenterPosition + (lastMousePos - self._mousePosition))
 587
 588                 if lastSelection != self._selectionIndex:
 589                         self.highlighted.emit(self._selectionIndex)
 590                         self._display.selectAt(self._selectionIndex)
 591
 592                 if self._selectionIndex != PieFiling.SELECTION_CENTER and self._delayPopupTimer.isActive():
 593                         self._on_delayed_popup()
 594
 595         @misc_utils.log_exception(_moduleLogger)
 596         def mouseReleaseEvent(self, mouseEvent):
 597                 self._delayPopupTimer.stop()
 598                 self._popupLocation = None
 599
 600                 lastSelection = self._selectionIndex
 601
 602                 lastMousePos = mouseEvent.pos()
 603                 if self._mousePosition is None:
 604                         # Absolute
 605                         self._update_selection(lastMousePos)
 606                 else:
 607                         # Relative
 608                         self._update_selection(self._cachedCenterPosition + (lastMousePos - self._mousePosition))
 609                 self._mousePosition = None
 610
 611                 self._activate_at(self._selectionIndex)
 612                 self._hide_child()
 613
 614         @misc_utils.log_exception(_moduleLogger)
 615         def keyPressEvent(self, keyEvent):
 616                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 617                         self._popup_child(QtGui.QCursor.pos())
 618                         if self._selectionIndex != len(self._filing) - 1:
 619                                 nextSelection = self._selectionIndex + 1
 620                         else:
 621                                 nextSelection = 0
 622                         self._select_at(nextSelection)
 623                         self._display.selectAt(self._selectionIndex)
 624                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 625                         self._popup_child(QtGui.QCursor.pos())
 626                         if 0 < self._selectionIndex:
 627                                 nextSelection = self._selectionIndex - 1
 628                         else:
 629                                 nextSelection = len(self._filing) - 1
 630                         self._select_at(nextSelection)
 631                         self._display.selectAt(self._selectionIndex)
 632                 elif keyEvent.key() in [QtCore.Qt.Key_Space]:
 633                         self._popup_child(QtGui.QCursor.pos())
 634                         self._select_at(PieFiling.SELECTION_CENTER)
 635                         self._display.selectAt(self._selectionIndex)
 636                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 637                         self._delayPopupTimer.stop()
 638                         self._popupLocation = None
 639                         self._activate_at(self._selectionIndex)
 640                         self._hide_child()
 641                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 642                         self._delayPopupTimer.stop()
 643                         self._popupLocation = None
 644                         self._activate_at(PieFiling.SELECTION_NONE)
 645                         self._hide_child()
 646                 else:
 647                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 648
 649         @misc_utils.log_exception(_moduleLogger)
 650         def showEvent(self, showEvent):
 651                 self._buttonArtist.show(self.palette())
 652                 self._cachedCenterPosition = self.rect().center()
 653
 654                 QtGui.QWidget.showEvent(self, showEvent)
 655
 656         @misc_utils.log_exception(_moduleLogger)
 657         def hideEvent(self, hideEvent):
 658                 self._display.hide()
 659                 self._select_at(PieFiling.SELECTION_NONE)
 660                 QtGui.QWidget.hideEvent(self, hideEvent)
 661
 662         @misc_utils.log_exception(_moduleLogger)
 663         def paintEvent(self, paintEvent):
 664                 if self._poppedUp:
 665                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_CENTER)
 666                 else:
 667                         canvas = self._buttonArtist.paint(PieFiling.SELECTION_NONE)
 668
 669                 screen = QtGui.QPainter(self)
 670                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 671
 672                 QtGui.QWidget.paintEvent(self, paintEvent)
 673
 674         def __iter__(self):
 675                 return iter(self._filing)
 676
 677         def __len__(self):
 678                 return len(self._filing)
 679
 680         def _popup_child(self, position):
 681                 self._poppedUp = True
 682                 self.aboutToShow.emit()
 683
 684                 self._delayPopupTimer.stop()
 685                 self._popupLocation = None
 686
 687                 position = position - QtCore.QPoint(self._filing.outerRadius(), self._filing.outerRadius())
 688                 self._display.move(position)
 689                 self._display.show()
 690
 691                 self.update()
 692
 693         def _hide_child(self):
 694                 self._poppedUp = False
 695                 self.aboutToHide.emit()
 696                 self._display.hide()
 697                 self.update()
 698
 699         def _select_at(self, index):
 700                 self._selectionIndex = index
 701
 702         def _update_selection(self, lastMousePos):
 703                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 704                 if radius < self._filing.innerRadius():
 705                         self._select_at(PieFiling.SELECTION_CENTER)
 706                 elif radius <= self._filing.outerRadius():
 707                         self._select_at(self.indexAt(lastMousePos))
 708                 else:
 709                         self._select_at(PieFiling.SELECTION_NONE)
 710
 711         def _activate_at(self, index):
 712                 if index == PieFiling.SELECTION_NONE:
 713                         self.canceled.emit()
 714                         return
 715                 elif index == PieFiling.SELECTION_CENTER:
 716                         child = self._filing.center()
 717                 else:
 718                         child = self.itemAt(index)
 719
 720                 if child.action().isEnabled():
 721                         child.action().trigger()
 722                         self.activated.emit(index)
 723                 else:
 724                         self.canceled.emit()
 725
 726
 727 class QPieMenu(QtGui.QWidget):
 728
 729         activated = QtCore.pyqtSignal(int)
 730         highlighted = QtCore.pyqtSignal(int)
 731         canceled = QtCore.pyqtSignal()
 732         aboutToShow = QtCore.pyqtSignal()
 733         aboutToHide = QtCore.pyqtSignal()
 734
 735         def __init__(self, parent = None):
 736                 QtGui.QWidget.__init__(self, parent)
 737                 self._cachedCenterPosition = self.rect().center()
 738
 739                 self._filing = PieFiling()
 740                 self._artist = PieArtist(self._filing)
 741                 self._selectionIndex = PieFiling.SELECTION_NONE
 742
 743                 self._mousePosition = ()
 744                 self.setFocusPolicy(QtCore.Qt.StrongFocus)
 745
 746         def popup(self, pos):
 747                 self._update_selection(pos)
 748                 self.show()
 749
 750         def insertItem(self, item, index = -1):
 751                 self._filing.insertItem(item, index)
 752                 self.update()
 753
 754         def removeItemAt(self, index):
 755                 self._filing.removeItemAt(index)
 756                 self.update()
 757
 758         def set_center(self, item):
 759                 self._filing.set_center(item)
 760                 self.update()
 761
 762         def clear(self):
 763                 self._filing.clear()
 764                 self.update()
 765
 766         def itemAt(self, index):
 767                 return self._filing.itemAt(index)
 768
 769         def indexAt(self, point):
 770                 return self._filing.indexAt(self._cachedCenterPosition, point)
 771
 772         def innerRadius(self):
 773                 return self._filing.innerRadius()
 774
 775         def setInnerRadius(self, radius):
 776                 self._filing.setInnerRadius(radius)
 777                 self.update()
 778
 779         def outerRadius(self):
 780                 return self._filing.outerRadius()
 781
 782         def setOuterRadius(self, radius):
 783                 self._filing.setOuterRadius(radius)
 784                 self.update()
 785
 786         def sizeHint(self):
 787                 return self._artist.pieSize()
 788
 789         @misc_utils.log_exception(_moduleLogger)
 790         def mousePressEvent(self, mouseEvent):
 791                 lastSelection = self._selectionIndex
 792
 793                 lastMousePos = mouseEvent.pos()
 794                 self._update_selection(lastMousePos)
 795                 self._mousePosition = lastMousePos
 796
 797                 if lastSelection != self._selectionIndex:
 798                         self.highlighted.emit(self._selectionIndex)
 799                         self.update()
 800
 801         @misc_utils.log_exception(_moduleLogger)
 802         def mouseMoveEvent(self, mouseEvent):
 803                 lastSelection = self._selectionIndex
 804
 805                 lastMousePos = mouseEvent.pos()
 806                 self._update_selection(lastMousePos)
 807
 808                 if lastSelection != self._selectionIndex:
 809                         self.highlighted.emit(self._selectionIndex)
 810                         self.update()
 811
 812         @misc_utils.log_exception(_moduleLogger)
 813         def mouseReleaseEvent(self, mouseEvent):
 814                 lastSelection = self._selectionIndex
 815
 816                 lastMousePos = mouseEvent.pos()
 817                 self._update_selection(lastMousePos)
 818                 self._mousePosition = ()
 819
 820                 self._activate_at(self._selectionIndex)
 821                 self.update()
 822
 823         @misc_utils.log_exception(_moduleLogger)
 824         def keyPressEvent(self, keyEvent):
 825                 if keyEvent.key() in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 826                         if self._selectionIndex != len(self._filing) - 1:
 827                                 nextSelection = self._selectionIndex + 1
 828                         else:
 829                                 nextSelection = 0
 830                         self._select_at(nextSelection)
 831                         self.update()
 832                 elif keyEvent.key() in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 833                         if 0 < self._selectionIndex:
 834                                 nextSelection = self._selectionIndex - 1
 835                         else:
 836                                 nextSelection = len(self._filing) - 1
 837                         self._select_at(nextSelection)
 838                         self.update()
 839                 elif keyEvent.key() in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 840                         self._activate_at(self._selectionIndex)
 841                 elif keyEvent.key() in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 842                         self._activate_at(PieFiling.SELECTION_NONE)
 843                 else:
 844                         QtGui.QWidget.keyPressEvent(self, keyEvent)
 845
 846         @misc_utils.log_exception(_moduleLogger)
 847         def showEvent(self, showEvent):
 848                 self.aboutToShow.emit()
 849                 self._cachedCenterPosition = self.rect().center()
 850
 851                 mask = self._artist.show(self.palette())
 852                 self.setMask(mask)
 853
 854                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 855                 self._update_selection(lastMousePos)
 856
 857                 QtGui.QWidget.showEvent(self, showEvent)
 858
 859         @misc_utils.log_exception(_moduleLogger)
 860         def hideEvent(self, hideEvent):
 861                 self._artist.hide()
 862                 self._selectionIndex = PieFiling.SELECTION_NONE
 863                 QtGui.QWidget.hideEvent(self, hideEvent)
 864
 865         @misc_utils.log_exception(_moduleLogger)
 866         def paintEvent(self, paintEvent):
 867                 canvas = self._artist.paint(self._selectionIndex)
 868
 869                 screen = QtGui.QPainter(self)
 870                 screen.drawPixmap(QtCore.QPoint(0, 0), canvas)
 871
 872                 QtGui.QWidget.paintEvent(self, paintEvent)
 873
 874         def __iter__(self):
 875                 return iter(self._filing)
 876
 877         def __len__(self):
 878                 return len(self._filing)
 879
 880         def _select_at(self, index):
 881                 self._selectionIndex = index
 882
 883         def _update_selection(self, lastMousePos):
 884                 radius = _radius_at(self._cachedCenterPosition, lastMousePos)
 885                 if radius < self._filing.innerRadius():
 886                         self._selectionIndex = PieFiling.SELECTION_CENTER
 887                 elif radius <= self._filing.outerRadius():
 888                         self._select_at(self.indexAt(lastMousePos))
 889                 else:
 890                         self._selectionIndex = PieFiling.SELECTION_NONE
 891
 892         def _activate_at(self, index):
 893                 if index == PieFiling.SELECTION_NONE:
 894                         self.canceled.emit()
 895                         self.aboutToHide.emit()
 896                         self.hide()
 897                         return
 898                 elif index == PieFiling.SELECTION_CENTER:
 899                         child = self._filing.center()
 900                 else:
 901                         child = self.itemAt(index)
 902
 903                 if child.isEnabled():
 904                         child.action().trigger()
 905                         self.activated.emit(index)
 906                 else:
 907                         self.canceled.emit()
 908                 self.aboutToHide.emit()
 909                 self.hide()
 910
 911
 912 def init_pies():
 913         PieFiling.NULL_CENTER.setEnabled(False)
 914
 915
 916 def _print(msg):
 917         print msg
 918
 919
 920 def _on_about_to_hide(app):
 921         app.exit()
 922
 923
 924 if __name__ == "__main__":
 925         app = QtGui.QApplication([])
 926         init_pies()
 927
 928         if False:
 929                 pie = QPieMenu()
 930                 pie.show()
 931
 932         if False:
 933                 singleAction = QtGui.QAction(None)
 934                 singleAction.setText("Boo")
 935                 singleItem = QActionPieItem(singleAction)
 936                 spie = QPieMenu()
 937                 spie.insertItem(singleItem)
 938                 spie.show()
 939
 940         if False:
 941                 oneAction = QtGui.QAction(None)
 942                 oneAction.setText("Chew")
 943                 oneItem = QActionPieItem(oneAction)
 944                 twoAction = QtGui.QAction(None)
 945                 twoAction.setText("Foo")
 946                 twoItem = QActionPieItem(twoAction)
 947                 iconTextAction = QtGui.QAction(None)
 948                 iconTextAction.setText("Icon")
 949                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 950                 iconTextItem = QActionPieItem(iconTextAction)
 951                 mpie = QPieMenu()
 952                 mpie.insertItem(oneItem)
 953                 mpie.insertItem(twoItem)
 954                 mpie.insertItem(oneItem)
 955                 mpie.insertItem(iconTextItem)
 956                 mpie.show()
 957
 958         if True:
 959                 oneAction = QtGui.QAction(None)
 960                 oneAction.setText("Chew")
 961                 oneAction.triggered.connect(lambda: _print("Chew"))
 962                 oneItem = QActionPieItem(oneAction)
 963                 twoAction = QtGui.QAction(None)
 964                 twoAction.setText("Foo")
 965                 twoAction.triggered.connect(lambda: _print("Foo"))
 966                 twoItem = QActionPieItem(twoAction)
 967                 iconAction = QtGui.QAction(None)
 968                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 969                 iconAction.triggered.connect(lambda: _print("Icon"))
 970                 iconItem = QActionPieItem(iconAction)
 971                 iconTextAction = QtGui.QAction(None)
 972                 iconTextAction.setText("Icon")
 973                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
 974                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
 975                 iconTextItem = QActionPieItem(iconTextAction)
 976                 mpie = QPieMenu()
 977                 mpie.set_center(iconItem)
 978                 mpie.insertItem(oneItem)
 979                 mpie.insertItem(twoItem)
 980                 mpie.insertItem(oneItem)
 981                 mpie.insertItem(iconTextItem)
 982                 mpie.show()
 983                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
 984                 mpie.canceled.connect(lambda: _print("Canceled"))
 985
 986         if False:
 987                 oneAction = QtGui.QAction(None)
 988                 oneAction.setText("Chew")
 989                 oneAction.triggered.connect(lambda: _print("Chew"))
 990                 oneItem = QActionPieItem(oneAction)
 991                 twoAction = QtGui.QAction(None)
 992                 twoAction.setText("Foo")
 993                 twoAction.triggered.connect(lambda: _print("Foo"))
 994                 twoItem = QActionPieItem(twoAction)
 995                 iconAction = QtGui.QAction(None)
 996                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
 997                 iconAction.triggered.connect(lambda: _print("Icon"))
 998                 iconItem = QActionPieItem(iconAction)
 999                 iconTextAction = QtGui.QAction(None)
1000                 iconTextAction.setText("Icon")
1001                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1002                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1003                 iconTextItem = QActionPieItem(iconTextAction)
1004                 pieFiling = PieFiling()
1005                 pieFiling.set_center(iconItem)
1006                 pieFiling.insertItem(oneItem)
1007                 pieFiling.insertItem(twoItem)
1008                 pieFiling.insertItem(oneItem)
1009                 pieFiling.insertItem(iconTextItem)
1010                 mpie = QPieDisplay(pieFiling)
1011                 mpie.show()
1012
1013         if False:
1014                 oneAction = QtGui.QAction(None)
1015                 oneAction.setText("Chew")
1016                 oneAction.triggered.connect(lambda: _print("Chew"))
1017                 oneItem = QActionPieItem(oneAction)
1018                 twoAction = QtGui.QAction(None)
1019                 twoAction.setText("Foo")
1020                 twoAction.triggered.connect(lambda: _print("Foo"))
1021                 twoItem = QActionPieItem(twoAction)
1022                 iconAction = QtGui.QAction(None)
1023                 iconAction.setIcon(QtGui.QIcon.fromTheme("gtk-open"))
1024                 iconAction.triggered.connect(lambda: _print("Icon"))
1025                 iconItem = QActionPieItem(iconAction)
1026                 iconTextAction = QtGui.QAction(None)
1027                 iconTextAction.setText("Icon")
1028                 iconTextAction.setIcon(QtGui.QIcon.fromTheme("gtk-close"))
1029                 iconTextAction.triggered.connect(lambda: _print("Icon and text"))
1030                 iconTextItem = QActionPieItem(iconTextAction)
1031                 mpie = QPieButton(iconItem)
1032                 mpie.set_center(iconItem)
1033                 mpie.insertItem(oneItem)
1034                 mpie.insertItem(twoItem)
1035                 mpie.insertItem(oneItem)
1036                 mpie.insertItem(iconTextItem)
1037                 mpie.show()
1038                 mpie.aboutToHide.connect(lambda: _on_about_to_hide(app))
1039                 mpie.canceled.connect(lambda: _print("Canceled"))
1040
1041         app.exec_()