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scanwidget: changes as of 19a1d40 (closes #330)
This commit is contained in:
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@ -62,23 +62,20 @@ class ScanSlider(QtWidgets.QSlider):
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def __init__(self):
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QtWidgets.QSlider.__init__(self, QtCore.Qt.Horizontal)
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self.startPos = 0 # Pos and Val can differ in event handling.
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# perhaps prevPos and currPos is more accurate.
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self.stopPos = 99
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self.startVal = 0 # lower
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self.stopVal = 99 # upper
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self.offset = 0
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self.position = 0
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self.upperPressed = QtWidgets.QStyle.SC_None
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self.lowerPressed = QtWidgets.QStyle.SC_None
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self.firstMovement = False # State var for handling slider overlap.
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self.blockTracking = False
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self.startVal = None
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self.stopVal = None
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self.offset = None
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self.position = None
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self.pressed = None
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self.setMinimum(0)
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self.setMaximum(4095)
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self.setRange(0, (1 << 15) - 1)
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# We need fake sliders to keep around so that we can dynamically
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# set the stylesheets for drawing each slider later. See paintEvent.
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# QPalettes would be nicer to use, since palette entries can be set
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# individually for each slider handle, but Windows 7 does not
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# use them. This seems to be the only way to override the colors
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# regardless of platform.
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self.dummyStartSlider = QtWidgets.QSlider()
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self.dummyStopSlider = QtWidgets.QSlider()
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self.dummyStartSlider.setStyleSheet(
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@ -86,19 +83,6 @@ class ScanSlider(QtWidgets.QSlider):
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self.dummyStopSlider.setStyleSheet(
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"QSlider::handle {background:red}")
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# We basically superimpose two QSliders on top of each other, discarding
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# the state that remains constant between the two when drawing.
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# Everything except the handles remain constant.
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def initHandleStyleOption(self, opt, handle):
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self.initStyleOption(opt)
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if handle == "start":
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opt.sliderPosition = self.startPos
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opt.sliderValue = self.startVal
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elif handle == "stop":
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opt.sliderPosition = self.stopPos
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opt.sliderValue = self.stopVal
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# We get the range of each slider separately.
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def pixelPosToRangeValue(self, pos):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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@ -137,98 +121,59 @@ class ScanSlider(QtWidgets.QSlider):
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self)
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return gr.width() - self.handleWidth()
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def handleMousePress(self, pos, control, val, handle):
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opt = QtWidgets.QStyleOptionSlider()
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self.initHandleStyleOption(opt, handle)
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startAtEdges = (handle == "start" and
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(self.startVal == self.minimum() or
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self.startVal == self.maximum()))
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stopAtEdges = (handle == "stop" and
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(self.stopVal == self.minimum() or
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self.stopVal == self.maximum()))
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# If chosen slider at edge, treat it as non-interactive.
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if startAtEdges or stopAtEdges:
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return QtWidgets.QStyle.SC_None
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oldControl = control
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control = self.style().hitTestComplexControl(
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QtWidgets.QStyle.CC_Slider, opt, pos, self)
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sr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderHandle,
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self)
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if control == QtWidgets.QStyle.SC_SliderHandle:
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# no pick()- slider orientation static
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self.offset = pos.x() - sr.topLeft().x()
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self.setSliderDown(True)
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# emit
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# Needed?
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if control != oldControl:
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self.update(sr)
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return control
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def drawHandle(self, painter, handle):
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def _getStyleOptionSlider(self, val):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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self.initHandleStyleOption(opt, handle)
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opt.sliderPosition = val
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opt.sliderValue = val
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opt.subControls = QtWidgets.QStyle.SC_SliderHandle
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painter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
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return opt
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def setSpan(self, low, high):
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# TODO: Is this necessary? QStyle::sliderPositionFromValue appears
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# to clamp already.
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low = min(max(self.minimum(), low), self.maximum())
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high = min(max(self.minimum(), high), self.maximum())
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if low != self.startVal or high != self.stopVal:
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if low != self.startVal:
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self.startVal = low
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self.startPos = low
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if high != self.stopVal:
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self.stopVal = high
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self.stopPos = high
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self.update()
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def _hitHandle(self, pos, val):
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# If chosen slider at edge, treat it as non-interactive.
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if not (self.minimum() < val < self.maximum()):
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return False
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opt = self._getStyleOptionSlider(val)
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control = self.style().hitTestComplexControl(
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QtWidgets.QStyle.CC_Slider, opt, pos, self)
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if control != QtWidgets.QStyle.SC_SliderHandle:
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return False
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sr = self.style().subControlRect(
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QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderHandle, self)
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self.offset = pos.x() - sr.topLeft().x()
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self.setSliderDown(True)
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# Needed?
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self.update(sr)
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return True
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def setStartPosition(self, val):
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if val != self.startPos:
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self.startPos = val
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if not self.hasTracking():
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self.update()
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if self.isSliderDown():
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self.sigStartMoved.emit(self.startPos)
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if self.hasTracking() and not self.blockTracking:
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self.setSpan(self.startPos, self.stopVal)
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if val == self.startVal:
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return
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self.startVal = val
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self.update()
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def setStopPosition(self, val):
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if val != self.stopPos:
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self.stopPos = val
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if not self.hasTracking():
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self.update()
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if self.isSliderDown():
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self.sigStopMoved.emit(self.stopPos)
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if self.hasTracking() and not self.blockTracking:
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self.setSpan(self.startVal, self.stopPos)
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if val == self.stopVal:
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return
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self.stopVal = val
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self.update()
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def mousePressEvent(self, ev):
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if ev.buttons() ^ ev.button():
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ev.ignore()
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return
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# Prefer stopVal in the default case.
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self.upperPressed = self.handleMousePress(
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ev.pos(), self.upperPressed, self.stopVal, "stop")
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if self.upperPressed != QtWidgets.QStyle.SC_SliderHandle:
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self.lowerPressed = self.handleMousePress(
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ev.pos(), self.upperPressed, self.startVal, "start")
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# State that is needed to handle the case where two sliders are equal.
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self.firstMovement = True
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if self._hitHandle(ev.pos(), self.stopVal):
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self.pressed = "stop"
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elif self._hitHandle(ev.pos(), self.startVal):
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self.pressed = "start"
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else:
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self.pressed = None
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ev.accept()
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def mouseMoveEvent(self, ev):
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if (self.lowerPressed != QtWidgets.QStyle.SC_SliderHandle and
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self.upperPressed != QtWidgets.QStyle.SC_SliderHandle):
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if not self.pressed:
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ev.ignore()
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return
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@ -246,49 +191,38 @@ class ScanSlider(QtWidgets.QSlider):
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if not r.contains(ev.pos()):
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newPos = self.position
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if self.firstMovement:
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if self.startPos == self.stopPos:
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# StopSlider is preferred, except in the case where
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# start == max possible value the slider can take.
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if self.startPos == self.maximum():
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self.lowerPressed = QtWidgets.QStyle.SC_SliderHandle
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self.upperPressed = QtWidgets.QStyle.SC_None
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self.firstMovement = False
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if self.lowerPressed == QtWidgets.QStyle.SC_SliderHandle:
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if self.pressed == "start":
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self.setStartPosition(newPos)
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if self.upperPressed == QtWidgets.QStyle.SC_SliderHandle:
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if self.hasTracking():
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self.sigStartMoved.emit(self.startVal)
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elif self.pressed == "stop":
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self.setStopPosition(newPos)
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if self.hasTracking():
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self.sigStopMoved.emit(self.stopVal)
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ev.accept()
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def mouseReleaseEvent(self, ev):
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QtWidgets.QSlider.mouseReleaseEvent(self, ev)
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self.setSliderDown(False) # AbstractSlider needs this
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self.lowerPressed = QtWidgets.QStyle.SC_None
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self.upperPressed = QtWidgets.QStyle.SC_None
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if not self.hasTracking():
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if self.pressed == "start":
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self.sigStartMoved.emit(self.startVal)
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elif self.pressed == "stop":
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self.sigStopMoved.emit(self.stopVal)
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self.pressed = None
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def paintEvent(self, ev):
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# Use QStylePainters to make redrawing as painless as possible.
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# Paint on the custom widget, using the attributes of the fake
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# slider references we keep around. setStyleSheet within paintEvent
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# leads to heavy performance penalties (and recursion?).
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# QPalettes would be nicer to use, since palette entries can be set
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# individually for each slider handle, but Windows 7 does not
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# use them. This seems to be the only way to override the colors
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# regardless of platform.
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# Use the pre-parsed, styled sliders.
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startPainter = QtWidgets.QStylePainter(self, self.dummyStartSlider)
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stopPainter = QtWidgets.QStylePainter(self, self.dummyStopSlider)
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# Handles
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# Qt will snap sliders to 0 or maximum() if given a desired pixel
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# location outside the mapped range. So we manually just don't draw
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# the handles if they are at 0 or max.
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# Only draw handles that are not railed
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if self.minimum() < self.startVal < self.maximum():
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self.drawHandle(startPainter, "start")
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opt = self._getStyleOptionSlider(self.startVal)
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startPainter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
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if self.minimum() < self.stopVal < self.maximum():
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self.drawHandle(stopPainter, "stop")
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opt = self._getStyleOptionSlider(self.stopVal)
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stopPainter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
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# real (Sliders) => pixel (one pixel movement of sliders would increment by X)
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@ -320,27 +254,20 @@ class ScanWidget(QtWidgets.QWidget):
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snapRangeAct.triggered.connect(self.snapRange)
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self.menu.addAction(snapRangeAct)
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self.realStart = -1.
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self.realStop = 1.
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self.numPoints = 11
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self.realStart = None
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self.realStop = None
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self.numPoints = None
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self.zoomMargin = zoomMargin
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self.dynamicRange = dynamicRange
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self.zoomFactor = zoomFactor
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# Transform that maps the spinboxes to a pixel position on the
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# axis. 0 to axis.width() exclusive indicate positions which will be
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# displayed on the axis.
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# Because the axis's width will change when placed within a layout,
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# the realToPixelTransform will initially be invalid. It will be set
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# properly during the first resizeEvent, with the below transform.
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self.realToPixelTransform = -self.axis.width()/2, 1.
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self.invalidOldSizeExpected = True
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# Connect event observers.
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axis.installEventFilter(self)
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slider.installEventFilter(self)
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slider.sigStopMoved.connect(self.handleStopMoved)
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slider.sigStartMoved.connect(self.handleStartMoved)
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slider.sigStopMoved.connect(self._handleStopMoved)
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slider.sigStartMoved.connect(self._handleStartMoved)
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def contextMenuEvent(self, ev):
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self.menu.popup(ev.globalPos())
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@ -353,7 +280,6 @@ class ScanWidget(QtWidgets.QWidget):
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rawVal = min(max(-(1 << 31), rawVal), (1 << 31) - 1)
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return rawVal
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# Get a point from pixel units to what the sliders display.
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def pixelToReal(self, val):
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a, b = self.realToPixelTransform
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return val/b + a
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@ -366,42 +292,38 @@ class ScanWidget(QtWidgets.QWidget):
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pixelVal = self.realToPixel(val)
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return self.slider.pixelPosToRangeValue(pixelVal)
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def setView(self, left, scale):
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self.realToPixelTransform = left, scale
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sliderX = self.realToRange(self.realStop)
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self.slider.setStopPosition(sliderX)
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sliderX = self.realToRange(self.realStart)
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self.slider.setStartPosition(sliderX)
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self.axis.update()
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def setStop(self, val):
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if self.realStop == val:
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return
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sliderX = self.realToRange(val)
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self.slider.setStopPosition(sliderX)
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self.realStop = val
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self.axis.update() # Number of points ticks changed positions.
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self.sigStopMoved.emit(val)
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def setStart(self, val):
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if self.realStart == val:
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return
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sliderX = self.realToRange(val)
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self.slider.setStartPosition(sliderX)
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self.realStart = val
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self.axis.update()
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self.sigStartMoved.emit(val)
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def setNumPoints(self, val):
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if self.numPoints == val:
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return
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self.numPoints = val
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self.axis.update()
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def handleStopMoved(self, rangeVal):
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# FIXME: this relies on the event being fed back and ending up calling
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# setStop()
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self.sigStopMoved.emit(self.rangeToReal(rangeVal))
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def handleStartMoved(self, rangeVal):
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# FIXME: this relies on the event being fed back and ending up calling
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# setStart()
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self.sigStartMoved.emit(self.rangeToReal(rangeVal))
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def handleZoom(self, zoomFactor, mouseXPos):
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newScale = self.realToPixelTransform[1] * zoomFactor
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refReal = self.pixelToReal(mouseXPos)
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newLeft = refReal - mouseXPos/newScale
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newZero = newLeft*newScale + self.slider.effectiveWidth()/2
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if zoomFactor > 1 and abs(newZero) > self.dynamicRange:
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return
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self.realToPixelTransform = newLeft, newScale
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self.setStop(self.realStop)
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self.setStart(self.realStart)
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self.sigNumChanged.emit(val)
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def viewRange(self):
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newScale = self.slider.effectiveWidth()/abs(
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@ -411,80 +333,65 @@ class ScanWidget(QtWidgets.QWidget):
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if newCenter:
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newScale = min(newScale, self.dynamicRange/abs(newCenter))
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newLeft = newCenter - self.slider.effectiveWidth()/2/newScale
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self.realToPixelTransform = newLeft, newScale
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self.setStop(self.realStop)
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self.setStart(self.realStart)
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self.axis.update() # Axis normally takes care to update itself during
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# zoom. In this code path however, the zoom didn't arrive via the axis
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# widget, so we need to notify manually.
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# This function is called if the axis width, slider width, and slider
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# positions are in an inconsistent state, to initialize the widget.
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# This function handles handles the slider positions. Slider and axis
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# handle its own width changes; proxy watches for axis width resizeEvent to
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# alter mapping from real to pixel space.
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def viewRangeInit(self):
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currRangeReal = abs(self.realStop - self.realStart)
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if currRangeReal == 0:
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self.setStop(self.realStop)
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self.setStart(self.realStart)
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# Ill-formed snap range- move the sliders anyway,
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# because we arrived here during widget
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# initialization, where the slider positions are likely invalid.
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# This will force the sliders to have positions on the axis
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# which reflect the start/stop values currently set.
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else:
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self.viewRange()
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# Notify spinboxes manually, since slider wasn't clicked and will
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# therefore not emit signals.
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self.sigStopMoved.emit(self.realStop)
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self.sigStartMoved.emit(self.realStart)
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self.setView(newLeft, newScale)
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def snapRange(self):
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lowRange = self.zoomMargin
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highRange = 1 - self.zoomMargin
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newStart = self.pixelToReal(lowRange * self.slider.effectiveWidth())
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newStop = self.pixelToReal(highRange * self.slider.effectiveWidth())
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# Signals won't fire unless slider was actually grabbed, so
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# manually update so the spinboxes know that knew values were set.
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# self.realStop/Start and the sliders themselves will be updated as a
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# consequence of ValueChanged signal in spinboxes. The slider widget
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# has guards against recursive signals in setSpan().
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# FIXME: this relies on the events being fed back and ending up
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# calling setStart() and setStop()
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self.sigStopMoved.emit(newStop)
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self.sigStartMoved.emit(newStart)
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self.setStart(newStart)
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self.setStop(newStop)
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def wheelEvent(self, ev):
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def _handleStartMoved(self, rangeVal):
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val = self.rangeToReal(rangeVal)
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self.realStart = val
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self.axis.update()
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self.sigStartMoved.emit(val)
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def _handleStopMoved(self, rangeVal):
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val = self.rangeToReal(rangeVal)
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self.realStop = val
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self.axis.update()
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self.sigStopMoved.emit(val)
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def _handleZoom(self, zoomFactor, mouseXPos):
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newScale = self.realToPixelTransform[1] * zoomFactor
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refReal = self.pixelToReal(mouseXPos)
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newLeft = refReal - mouseXPos/newScale
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newZero = newLeft*newScale + self.slider.effectiveWidth()/2
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if zoomFactor > 1 and abs(newZero) > self.dynamicRange:
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return
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self.setView(newLeft, newScale)
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def _wheelEvent(self, ev):
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y = ev.angleDelta().y()
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if y:
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if ev.modifiers() & QtCore.Qt.ShiftModifier:
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# If shift+scroll, modify number of points.
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# TODO: This is not perfect. For high-resolution touchpads you
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# get many small events with y < 120 which should accumulate.
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# That would also match the wheel behavior of an integer
|
||||
# spinbox.
|
||||
z = int(y / 120.)
|
||||
# FIXME: this relies on the event being fed back and ending up
|
||||
# calling setNumPoints()
|
||||
self.sigNumChanged.emit(self.numPoints + z)
|
||||
self.axis.update()
|
||||
ev.accept()
|
||||
elif ev.modifiers() & QtCore.Qt.ControlModifier:
|
||||
if ev.modifiers() & QtCore.Qt.ShiftModifier:
|
||||
# If shift+scroll, modify number of points.
|
||||
# TODO: This is not perfect. For high-resolution touchpads you
|
||||
# get many small events with y < 120 which should accumulate.
|
||||
# That would also match the wheel behavior of an integer
|
||||
# spinbox.
|
||||
z = int(y / 120.)
|
||||
if z:
|
||||
self.setNumPoints(max(1, self.numPoints + z))
|
||||
ev.accept()
|
||||
elif ev.modifiers() & QtCore.Qt.ControlModifier:
|
||||
# Remove the slider-handle shift correction, b/c none of the
|
||||
# other widgets know about it. If we have the mouse directly
|
||||
# over a tick during a zoom, it should appear as if we are
|
||||
# doing zoom relative to the ticks which live in axis
|
||||
# pixel-space, not slider pixel-space.
|
||||
if y:
|
||||
z = self.zoomFactor**(y / 120.)
|
||||
# Remove the slider-handle shift correction, b/c none of the
|
||||
# other widgets know about it. If we have the mouse directly
|
||||
# over a tick during a zoom, it should appear as if we are
|
||||
# doing zoom relative to the ticks which live in axis
|
||||
# pixel-space, not slider pixel-space.
|
||||
self.handleZoom(z, ev.x() - self.slider.handleWidth()/2)
|
||||
ev.accept()
|
||||
else:
|
||||
ev.ignore()
|
||||
self._handleZoom(z, ev.x() - self.slider.handleWidth()/2)
|
||||
ev.accept()
|
||||
else:
|
||||
ev.ignore()
|
||||
|
||||
def eventFilter(self, obj, ev):
|
||||
if ev.type() == QtCore.QEvent.Wheel:
|
||||
self.wheelEvent(ev)
|
||||
self._wheelEvent(ev)
|
||||
return True
|
||||
if not (obj is self.axis and ev.type() == QtCore.QEvent.Resize):
|
||||
return False
|
||||
@ -497,24 +404,7 @@ class ScanWidget(QtWidgets.QWidget):
|
||||
center = (self.realStop + self.realStart)/2
|
||||
if center:
|
||||
newScale = min(newScale, self.dynamicRange/abs(center))
|
||||
self.realToPixelTransform = oldLeft, newScale
|
||||
self.setView(oldLeft, newScale)
|
||||
else:
|
||||
# TODO: self.axis.width() is invalid during object
|
||||
# construction. The width will change when placed in a
|
||||
# layout WITHOUT a resizeEvent. Why?
|
||||
oldLeft = -ev.size().width()/2
|
||||
newScale = 1.0
|
||||
self.realToPixelTransform = oldLeft, newScale
|
||||
# We need to reinitialize the pixel transform b/c the old width
|
||||
# of the axis is no longer valid. When we have a valid transform,
|
||||
# we can then viewRange based on the desired real values.
|
||||
# The slider handle values are invalid before this point as well;
|
||||
# we set them to the correct value here, regardless of whether
|
||||
# the slider has already resized itsef or not.
|
||||
self.viewRangeInit()
|
||||
self.invalidOldSizeExpected = False
|
||||
# Slider will update independently, making sure that the old
|
||||
# slider positions are preserved. Because of this, we can be
|
||||
# confident that the new slider position will still map to the
|
||||
# same positions in the new axis-space.
|
||||
self.viewRange()
|
||||
return False
|
||||
|
||||
Loading…
Reference in New Issue
Block a user