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scanwidget: apply changes as of 579bf5e
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d34d83f35c
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78f2706aa8
@ -10,15 +10,12 @@ logger = logging.getLogger(__name__)
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class ScanAxis(QtWidgets.QWidget):
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sigZoom = QtCore.pyqtSignal(float, int)
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sigPoints = QtCore.pyqtSignal(int)
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def __init__(self, zoomFactor):
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def __init__(self):
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QtWidgets.QWidget.__init__(self)
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self.proxy = None
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self.sizePolicy().setControlType(QtWidgets.QSizePolicy.ButtonBox)
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self.ticker = Ticker()
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self.zoomFactor = zoomFactor
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self.setMinimumHeight(40)
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def paintEvent(self, ev):
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painter = QtGui.QPainter(self)
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@ -52,37 +49,6 @@ class ScanAxis(QtWidgets.QWidget):
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painter.drawLine(p_int, 0, p_int, 5)
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ev.accept()
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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
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# spinbox.
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z = int(y / 120.)
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self.sigPoints.emit(z)
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else:
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z = self.zoomFactor**(y / 120.)
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# Remove the slider-handle shift correction, b/c none of the
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# other widgets know about it. If we have the mouse directly
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# over a tick during a zoom, it should appear as if we are
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# doing zoom relative to the ticks which live in axis
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# pixel-space, not slider pixel-space.
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self.sigZoom.emit(
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z, ev.x() - self.proxy.slider.handleWidth()/2)
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self.update()
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ev.accept()
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def eventFilter(self, obj, ev):
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if obj is not self.proxy.slider:
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return False
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if ev.type() != QtCore.QEvent.Wheel:
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return False
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self.wheelEvent(ev)
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return True
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# Basic ideas from https://gist.github.com/Riateche/27e36977f7d5ea72cf4f
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class ScanSlider(QtWidgets.QSlider):
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@ -103,6 +69,9 @@ class ScanSlider(QtWidgets.QSlider):
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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.setMinimum(0)
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self.setMaximum(4095)
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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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self.dummyStartSlider = QtWidgets.QSlider()
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@ -201,10 +170,6 @@ class ScanSlider(QtWidgets.QSlider):
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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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# def triggerAction(self, action, slider):
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# if action == QtWidgets.QAbstractSlider.SliderSingleStepAdd:
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# if
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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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@ -241,7 +206,7 @@ class ScanSlider(QtWidgets.QSlider):
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self.setSpan(self.startVal, self.stopPos)
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def mousePressEvent(self, ev):
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if self.minimum() == self.maximum() or (ev.buttons() ^ ev.button()):
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if ev.buttons() ^ ev.button():
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ev.ignore()
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return
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@ -315,9 +280,9 @@ class ScanSlider(QtWidgets.QSlider):
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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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if self.startVal > 0 and self.startVal < self.maximum():
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if self.minimum() < self.startVal < self.maximum():
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self.drawHandle(startPainter, "start")
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if self.stopVal > 0 and self.stopVal < self.maximum():
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if self.minimum() < self.stopVal < self.maximum():
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self.drawHandle(stopPainter, "stop")
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@ -326,17 +291,19 @@ class ScanSlider(QtWidgets.QSlider):
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class ScanProxy(QtCore.QObject):
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sigStartMoved = QtCore.pyqtSignal(float)
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sigStopMoved = QtCore.pyqtSignal(float)
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sigNumPoints = QtCore.pyqtSignal(int)
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sigNumChanged = QtCore.pyqtSignal(int)
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def __init__(self, slider, axis, zoomMargin, dynamicRange):
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def __init__(self, slider, axis, zoomMargin, dynamicRange, zoomFactor):
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QtCore.QObject.__init__(self)
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self.axis = axis
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axis.proxy = self
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self.slider = slider
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self.realStart = 0
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self.realStop = 0
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self.numPoints = 10
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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.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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@ -347,6 +314,12 @@ class ScanProxy(QtCore.QObject):
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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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# pixel vals for sliders: 0 to slider_width - 1
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def realToPixel(self, val):
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a, b = self.realToPixelTransform
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@ -381,14 +354,15 @@ class ScanProxy(QtCore.QObject):
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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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# moveStop()
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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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# moveStart()
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self.sigStartMoved.emit(self.rangeToReal(rangeVal))
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def handleNumPoints(self, inc):
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self.sigNumPoints.emit(self.numPoints + inc)
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def setNumPoints(self, val):
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self.numPoints = val
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self.axis.update()
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@ -446,28 +420,55 @@ class ScanProxy(QtCore.QObject):
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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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sliderRange = self.slider.maximum() - self.slider.minimum()
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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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if sliderRange > 0:
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self.sigStopMoved.emit(newStop)
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self.sigStartMoved.emit(newStart)
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# FIXME: this relies on the events being fed back and ending up
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# calling moveStart() and moveStop()
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self.sigStopMoved.emit(newStop)
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self.sigStartMoved.emit(newStart)
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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
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# spinbox.
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z = int(y / 120.)
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# FIXME: this relies on the event being fed back and ending up
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# calling setNumPoints()
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self.sigNumChanged.emit(self.numPoints + z)
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self.axis.update()
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else:
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z = self.zoomFactor**(y / 120.)
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# Remove the slider-handle shift correction, b/c none of the
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# other widgets know about it. If we have the mouse directly
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# over a tick during a zoom, it should appear as if we are
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# doing zoom relative to the ticks which live in axis
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# pixel-space, not slider pixel-space.
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self.handleZoom(z, ev.x() - self.slider.handleWidth()/2)
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ev.accept()
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def eventFilter(self, obj, ev):
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if obj != self.axis:
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return False
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if ev.type() != QtCore.QEvent.Resize:
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if ev.type() == QtCore.QEvent.Wheel:
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self.wheelEvent(ev)
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return True
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if not (obj is self.axis and ev.type() == QtCore.QEvent.Resize):
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return False
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if ev.oldSize().isValid():
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oldLeft = self.pixelToReal(0)
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refWidth = ev.oldSize().width() - self.slider.handleWidth()
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refRight = self.pixelToReal(refWidth)
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newWidth = ev.size().width() - self.slider.handleWidth()
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# assert refRight > oldLeft
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newScale = newWidth/(refRight - oldLeft)
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center = (self.realStop + self.realStart)/2
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if center:
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newScale = min(newScale, self.dynamicRange/abs(center))
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self.realToPixelTransform = oldLeft, newScale
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else:
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# TODO: self.axis.width() is invalid during object
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@ -484,8 +485,6 @@ class ScanProxy(QtCore.QObject):
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# the slider has already resized itsef or not.
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self.viewRangeInit()
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self.invalidOldSizeExpected = False
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# assert self.pixelToReal(0) == oldLeft, \
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# "{}, {}".format(self.pixelToReal(0), oldLeft)
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# Slider will update independently, making sure that the old
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# slider positions are preserved. Because of this, we can be
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# confident that the new slider position will still map to the
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@ -498,43 +497,34 @@ class ScanWidget(QtWidgets.QWidget):
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sigStopMoved = QtCore.pyqtSignal(float)
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sigNumChanged = QtCore.pyqtSignal(int)
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def __init__(self, zoomFactor=1.05, zoomMargin=.1, dynamicRange=1e8):
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def __init__(self, zoomFactor=1.05, zoomMargin=.1, dynamicRange=1e9):
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QtWidgets.QWidget.__init__(self)
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self.slider = slider = ScanSlider()
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self.axis = axis = ScanAxis(zoomFactor)
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self.proxy = ScanProxy(slider, axis, zoomMargin, dynamicRange)
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axis.proxy = self.proxy
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slider.setMaximum(1023)
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self.axis = axis = ScanAxis()
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self.proxy = ScanProxy(slider, axis, zoomMargin, dynamicRange,
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zoomFactor)
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# Layout.
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layout = QtWidgets.QGridLayout()
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# Default size will cause axis to disappear otherwise.
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layout.setRowMinimumHeight(0, 40)
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layout.addWidget(axis, 0, 0, 1, -1)
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layout.addWidget(slider, 1, 0, 1, -1)
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layout = QtWidgets.QVBoxLayout()
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layout.setSpacing(0)
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layout.addWidget(axis)
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layout.addWidget(slider)
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self.setLayout(layout)
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# Connect signals (minus context menu)
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slider.sigStopMoved.connect(self.proxy.handleStopMoved)
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slider.sigStartMoved.connect(self.proxy.handleStartMoved)
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self.proxy.sigStopMoved.connect(self.sigStopMoved)
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self.proxy.sigStartMoved.connect(self.sigStartMoved)
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self.proxy.sigNumPoints.connect(self.sigNumChanged)
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axis.sigZoom.connect(self.proxy.handleZoom)
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axis.sigPoints.connect(self.proxy.handleNumPoints)
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# Connect event observers.
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axis.installEventFilter(self.proxy)
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slider.installEventFilter(axis)
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self.proxy.sigNumChanged.connect(self.sigNumChanged)
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# Context menu entries
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self.viewRangeAct = QtWidgets.QAction("&View Range", self)
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self.snapRangeAct = QtWidgets.QAction("&Snap Range", self)
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self.viewRangeAct.triggered.connect(self.viewRange)
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self.snapRangeAct.triggered.connect(self.snapRange)
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self.menu = QtWidgets.QMenu(self)
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viewRangeAct = QtWidgets.QAction("&View Range", self)
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viewRangeAct.triggered.connect(self.viewRange)
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self.menu.addAction(viewRangeAct)
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snapRangeAct = QtWidgets.QAction("&Snap Range", self)
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snapRangeAct.triggered.connect(self.snapRange)
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self.menu.addAction(snapRangeAct)
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# Spinbox and button slots. Any time the spinboxes change, ScanWidget
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# mirrors it and passes the information to the proxy.
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def setStop(self, val):
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self.proxy.moveStop(val)
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@ -551,7 +541,4 @@ class ScanWidget(QtWidgets.QWidget):
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self.proxy.snapRange()
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def contextMenuEvent(self, ev):
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menu = QtWidgets.QMenu(self)
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menu.addAction(self.viewRangeAct)
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menu.addAction(self.snapRangeAct)
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menu.exec(ev.globalPos())
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self.menu.popup(ev.globalPos())
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