git.maemo.org Git - ejpi/blob - src/libraries/qtpie.py

   1 #!/usr/bin/env python
   2
   3 import math
   4
   5 from PyQt4 import QtGui
   6 from PyQt4 import QtCore
   7
   8
   9 class QActionPieItem(object):
  10
  11         def __init__(self, action, weight = 1):
  12                 self._action = action
  13                 self._weight = weight
  14
  15         def action(self):
  16                 return self._action
  17
  18         def setWeight(self, weight):
  19                 self._weight = weight
  20
  21         def weight(self):
  22                 return self._weight
  23
  24         def setEnabled(self, enabled = True):
  25                 self._action.setEnabled(enabled)
  26
  27         def isEnabled(self):
  28                 return self._action.isEnabled()
  29
  30
  31 class QPieMenu(QtGui.QWidget):
  32
  33         INNER_RADIUS_DEFAULT = 24
  34         OUTER_RADIUS_DEFAULT = 64
  35         ICON_SIZE_DEFAULT = 32
  36
  37         activated = QtCore.pyqtSignal((), (int, ))
  38         highlighted = QtCore.pyqtSignal(int)
  39         canceled = QtCore.pyqtSignal()
  40         aboutToShow = QtCore.pyqtSignal()
  41         aboutToHide = QtCore.pyqtSignal()
  42
  43         def __init__(self, parent = None):
  44                 QtGui.QWidget.__init__(self, parent)
  45                 self._innerRadius = self.INNER_RADIUS_DEFAULT
  46                 self._outerRadius = self.OUTER_RADIUS_DEFAULT
  47                 self._children = []
  48                 self._selectionIndex = -2
  49
  50                 self._motion = 0
  51                 self._mouseButtonPressed = True
  52                 self._mousePosition = ()
  53
  54                 canvasSize = self._outerRadius * 2 + 1
  55                 self._canvas = QtGui.QPixmap(canvasSize, canvasSize)
  56                 self._mask = None
  57
  58         def popup(self, pos):
  59                 index = self.indexAt(self.mapFromGlobal(QtGui.QCursor.pos()))
  60                 self._mousePosition = pos
  61                 self.show()
  62
  63         def insertItem(self, item, index = -1):
  64                 self._children.insert(index, item)
  65                 self._invalidate_view()
  66
  67         def removeItemAt(self, index):
  68                 item = self._children.pop(index)
  69                 self._invalidate_view()
  70
  71         def clear(self):
  72                 del self._children[:]
  73                 self._invalidate_view()
  74
  75         def itemAt(self, index):
  76                 return self._children[index]
  77
  78         def indexAt(self, point):
  79                 return self._angle_to_index(self._angle_at(point))
  80
  81         def setHighlightedItem(self, index):
  82                 pass
  83
  84         def highlightedItem(self):
  85                 pass
  86
  87         def innerRadius(self):
  88                 return self._innerRadius
  89
  90         def setInnerRadius(self, radius):
  91                 self._innerRadius = radius
  92
  93         def outerRadius(self):
  94                 return self._outerRadius
  95
  96         def setOuterRadius(self, radius):
  97                 self._outerRadius = radius
  98                 self._canvas = self._canvas.scaled(self.sizeHint())
  99
 100         def sizeHint(self):
 101                 diameter = self._outerRadius * 2 + 1
 102                 return QtCore.QSize(diameter, diameter)
 103
 104         def showEvent(self, showEvent):
 105                 self.aboutToShow.emit()
 106
 107                 if self._mask is None:
 108                         self._mask = QtGui.QBitmap(self._canvas.size())
 109                         self._mask.fill(QtCore.Qt.color0)
 110                         self._generate_mask(self._mask)
 111                         self._canvas.setMask(self._mask)
 112                         self.setMask(self._mask)
 113
 114                 self._motion = 0
 115
 116                 lastMousePos = self.mapFromGlobal(QtGui.QCursor.pos())
 117                 radius = self._radius_at(lastMousePos)
 118                 if self._innerRadius <= radius and radius <= self._outerRadius:
 119                         self._select_at(self._angle_to_index(lastMousePos))
 120                 else:
 121                         if radius < self._innerRadius:
 122                                 self._selectionIndex = -1
 123                         else:
 124                                 self._selectionIndex = -2
 125
 126                 QtGui.QWidget.showEvent(self, showEvent)
 127
 128         def hideEvent(self, hideEvent):
 129                 self.canceled.emit()
 130                 self._selectionIndex = -2
 131                 QtGui.QWidget.hideEvent(self, hideEvent)
 132
 133         def paintEvent(self, paintEvent):
 134                 painter = QtGui.QPainter(self._canvas)
 135                 painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
 136
 137                 adjustmentRect = self._canvas.rect().adjusted(0, 0, -1, -1)
 138
 139                 numChildren = len(self._children)
 140                 if numChildren < 2:
 141                         if self._selectionIndex == 0 and self._children[0].isEnabled():
 142                                 painter.setBrush(self.palette().highlight())
 143                         else:
 144                                 painter.setBrush(self.palette().background())
 145
 146                         painter.fillRect(self.rect(), painter.brush())
 147                 else:
 148                         for i, child in enumerate(self._children):
 149                                 if i == self._selectionIndex:
 150                                         painter.setBrush(self.palette().highlight())
 151                                 else:
 152                                         painter.setBrush(self.palette().background())
 153                                 painter.setPen(self.palette().mid().color())
 154
 155                                 a = self._index_to_angle(i, True)
 156                                 b = self._index_to_angle(i + 1, True)
 157                                 if b < a:
 158                                         b += 2*math.pi
 159                                 size = b - a
 160                                 if size < 0:
 161                                         size += 2*math.pi
 162
 163                                 startAngleInDeg = (a * 360 * 16) / (2*math.pi)
 164                                 sizeInDeg = (size * 360 * 16) / (2*math.pi)
 165                                 painter.drawPie(adjustmentRect, int(startAngleInDeg), int(sizeInDeg))
 166
 167                 dark = self.palette().dark().color()
 168                 light = self.palette().light().color()
 169                 if self._selectionIndex == -1:
 170                         background = self.palette().highlight().color()
 171                 else:
 172                         background = self.palette().background().color()
 173
 174                 innerRect = QtCore.QRect(
 175                         adjustmentRect.center().x() - self._innerRadius,
 176                         adjustmentRect.center().y() - self._innerRadius,
 177                         self._innerRadius * 2 + 1,
 178                         self._innerRadius * 2 + 1,
 179                 )
 180
 181                 painter.setPen(QtCore.Qt.NoPen)
 182                 painter.setBrush(background)
 183                 painter.drawPie(innerRect, 0, 360 * 16)
 184
 185                 painter.setPen(QtGui.QPen(dark, 1))
 186                 painter.setBrush(QtCore.Qt.NoBrush)
 187                 painter.drawEllipse(innerRect)
 188
 189                 painter.setPen(QtGui.QPen(dark, 1))
 190                 painter.setBrush(QtCore.Qt.NoBrush)
 191                 painter.drawEllipse(adjustmentRect)
 192
 193                 r = QtCore.QRect(innerRect)
 194                 innerRect.setLeft(r.center().x() + ((r.left() - r.center().x()) / 3) * 1)
 195                 innerRect.setRight(r.center().x() + ((r.right() - r.center().x()) / 3) * 1)
 196                 innerRect.setTop(r.center().y() + ((r.top() - r.center().y()) / 3) * 1)
 197                 innerRect.setBottom(r.center().y() + ((r.bottom() - r.center().y()) / 3) * 1)
 198
 199                 if self._selectionIndex == -1:
 200                         text = self.palette().highlightedText().color()
 201                 else:
 202                         text = self.palette().text().color()
 203
 204                 for i, child in enumerate(self._children):
 205                         text = child.action().text()
 206
 207                         a = self._index_to_angle(i, True)
 208                         b = self._index_to_angle(i + 1, True)
 209                         if b < a:
 210                                 b += 2*math.pi
 211                         middleAngle = (a + b) / 2
 212                         averageRadius = (self._innerRadius + self._outerRadius) / 2
 213
 214                         sliceX = averageRadius * math.cos(middleAngle)
 215                         sliceY = - averageRadius * math.sin(middleAngle)
 216
 217                         pieX = self._canvas.rect().center().x()
 218                         pieY = self._canvas.rect().center().y()
 219
 220                         fontMetrics = painter.fontMetrics()
 221                         if text:
 222                                 textBoundingRect = fontMetrics.boundingRect(text)
 223                         else:
 224                                 textBoundingRect = QtCore.QRect()
 225                         textWidth = textBoundingRect.width()
 226                         textHeight = textBoundingRect.height()
 227
 228                         icon = child.action().icon().pixmap(
 229                                 QtCore.QSize(self.ICON_SIZE_DEFAULT, self.ICON_SIZE_DEFAULT),
 230                                 QtGui.QIcon.Normal,
 231                                 QtGui.QIcon.On,
 232                         )
 233                         averageWidth = (icon.width() + textWidth)/2
 234                         if not icon.isNull():
 235                                 iconRect = QtCore.QRect(
 236                                         pieX + sliceX - averageWidth,
 237                                         pieY + sliceY - icon.height()/2,
 238                                         icon.width(),
 239                                         icon.height(),
 240                                 )
 241
 242                                 painter.drawPixmap(iconRect, icon)
 243
 244                         if text:
 245                                 if i == self._selectionIndex:
 246                                         if child.action().isEnabled():
 247                                                 pen = self.palette().highlightedText()
 248                                                 brush = self.palette().highlight()
 249                                         else:
 250                                                 pen = self.palette().mid()
 251                                                 brush = self.palette().background()
 252                                 else:
 253                                         if child.action().isEnabled():
 254                                                 pen = self.palette().text()
 255                                         else:
 256                                                 pen = self.palette().mid()
 257                                         brush = self.palette().background()
 258
 259                                 leftX = pieX + sliceX - averageWidth + icon.width()
 260                                 topY = pieY + sliceY + textHeight/2
 261                                 painter.setPen(pen.color())
 262                                 painter.setBrush(brush)
 263                                 painter.drawText(leftX, topY, text)
 264
 265                 screen = QtGui.QPainter(self)
 266                 screen.drawPixmap(QtCore.QPoint(0, 0), self._canvas)
 267
 268                 QtGui.QWidget.paintEvent(self, paintEvent)
 269
 270         def __len__(self):
 271                 return len(self._children)
 272
 273         def _invalidate_view(self):
 274                 pass
 275
 276         def _generate_mask(self, mask):
 277                 """
 278                 Specifies on the mask the shape of the pie menu
 279                 """
 280                 painter = QtGui.QPainter(mask)
 281                 painter.setPen(QtCore.Qt.color1)
 282                 painter.setBrush(QtCore.Qt.color1)
 283                 painter.drawEllipse(mask.rect().adjusted(0, 0, -1, -1))
 284
 285         def _select_at(self, index):
 286                 self._selectionIndex = index
 287
 288                 numChildren = len(self._children)
 289                 loopDelta = max(numChildren, 1)
 290                 while self._selectionIndex < 0:
 291                         self._selectionIndex += loopDelta
 292                 while numChildren <= self._selectionIndex:
 293                         self._selectionIndex -= loopDelta
 294
 295         def _activate_at(self, index):
 296                 child = self.itemAt(index)
 297                 if child.action.isEnabled:
 298                         child.action.trigger()
 299                 self.activated.emit()
 300                 self.aboutToHide.emit()
 301                 self.hide()
 302
 303         def _index_to_angle(self, index, isShifted):
 304                 index = index % len(self._children)
 305
 306                 totalWeight = sum(child.weight() for child in self._children)
 307                 if totalWeight == 0:
 308                         totalWeight = 1
 309                 baseAngle = (2 * math.pi) / totalWeight
 310
 311                 angle = math.pi / 2
 312                 if isShifted:
 313                         if self._children:
 314                                 angle -= (self._children[0].weight() * baseAngle) / 2
 315                         else:
 316                                 angle -= baseAngle / 2
 317                 while angle < 0:
 318                         angle += 2*math.pi
 319
 320                 for i, child in enumerate(self._children):
 321                         if index < i:
 322                                 break
 323                         angle += child.weight() * baseAngle
 324                 while (2*math.pi) < angle:
 325                         angle -= 2*math.pi
 326
 327                 return angle
 328
 329         def _angle_to_index(self, angle):
 330                 numChildren = len(self._children)
 331                 if numChildren == 0:
 332                         return -1
 333
 334                 totalWeight = sum(child.weight() for child in self._children)
 335                 if totalWeight == 0:
 336                         totalWeight = 1
 337                 baseAngle = (2 * math.pi) / totalWeight
 338
 339                 iterAngle = math.pi / 2 - (self.itemAt(0).weight * baseAngle) / 2
 340                 while iterAngle < 0:
 341                         iterAngle += 2 * math.pi
 342
 343                 oldIterAngle = iterAngle
 344                 for index, child in enumerate(self._children):
 345                         iterAngle += child.weight * baseAngle
 346                         if oldIterAngle < iterAngle and angle <= iterAngle:
 347                                 return index
 348                         elif oldIterAngle < (iterAngle + 2*math.pi) and angle <= (iterAngle + 2*math.pi):
 349                                 return index
 350                         oldIterAngle = iterAngle
 351
 352         def _radius_at(self, pos):
 353                 xDelta = pos.x() - self.rect().center().x()
 354                 yDelta = pos.y() - self.rect().center().y()
 355
 356                 radius = math.sqrt(xDelta ** 2 + yDelta ** 2)
 357                 return radius
 358
 359         def _angle_at(self, pos):
 360                 xDelta = pos.x() - self.rect().center().x()
 361                 yDelta = pos.y() - self.rect().center().y()
 362
 363                 radius = math.sqrt(xDelta ** 2 + yDelta ** 2)
 364                 angle = math.acos(xDelta / radius)
 365                 if 0 <= yDelta:
 366                         angle = 2*math.pi - angle
 367
 368                 return angle
 369
 370         def _on_key_press(self, keyEvent):
 371                 if keyEvent.key in [QtCore.Qt.Key_Right, QtCore.Qt.Key_Down, QtCore.Qt.Key_Tab]:
 372                         self._select_at(self._selectionIndex + 1)
 373                 elif keyEvent.key in [QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Backtab]:
 374                         self._select_at(self._selectionIndex - 1)
 375                 elif keyEvent.key in [QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter, QtCore.Qt.Key_Space]:
 376                         self._motion = 0
 377                         self._activate_at(self._selectionIndex)
 378                 elif keyEvent.key in [QtCore.Qt.Key_Escape, QtCore.Qt.Key_Backspace]:
 379                         pass
 380
 381         def _on_mouse_press(self, mouseEvent):
 382                 self._mouseButtonPressed = True
 383
 384
 385 if __name__ == "__main__":
 386         app = QtGui.QApplication([])
 387
 388         if False:
 389                 pie = QPieMenu()
 390                 pie.show()
 391
 392         if False:
 393                 singleAction = QtGui.QAction(None)
 394                 singleAction.setText("Boo")
 395                 singleItem = QActionPieItem(singleAction)
 396                 spie = QPieMenu()
 397                 spie.insertItem(singleItem)
 398                 spie.show()
 399
 400         if True:
 401                 oneAction = QtGui.QAction(None)
 402                 oneAction.setText("Chew")
 403                 oneItem = QActionPieItem(oneAction)
 404                 twoAction = QtGui.QAction(None)
 405                 twoAction.setText("Foo")
 406                 twoItem = QActionPieItem(twoAction)
 407                 mpie = QPieMenu()
 408                 mpie.insertItem(oneItem)
 409                 mpie.insertItem(twoItem)
 410                 mpie.insertItem(oneItem)
 411                 mpie.insertItem(twoItem)
 412                 mpie.show()
 413
 414         app.exec_()