2016-02-26 03:34:04 +08:00
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from PyQt5 import QtGui, QtCore, QtWidgets
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from .ticker import Ticker
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2016-03-08 19:35:13 +08:00
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from numpy import linspace
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2016-02-26 03:34:04 +08:00
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class ScanAxis(QtWidgets.QWidget):
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sigZoom = QtCore.pyqtSignal(float, int)
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2016-03-08 19:35:13 +08:00
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sigPoints = QtCore.pyqtSignal(int)
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2016-02-26 03:34:04 +08:00
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def __init__(self, zoomFactor):
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QtWidgets.QWidget.__init__(self)
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self.proxy = None
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self.slider = None # Needed for eventFilter
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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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def paintEvent(self, ev):
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painter = QtGui.QPainter(self)
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font = painter.font()
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avgCharWidth = QtGui.QFontMetrics(font).averageCharWidth()
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painter.setRenderHint(QtGui.QPainter.Antialiasing)
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# The center of the slider handles should reflect what's displayed
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# on the spinboxes.
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painter.translate(self.proxy.slider.handleWidth()/2, self.height() - 5)
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painter.drawLine(0, 0, self.width(), 0)
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realLeft = self.proxy.pixelToReal(0)
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realRight = self.proxy.pixelToReal(self.width())
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ticks, prefix, labels = self.ticker(realLeft, realRight)
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2016-02-26 03:34:04 +08:00
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for t, l in zip(ticks, labels):
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t = self.proxy.realToPixel(t)
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textCenter = (len(l)/2.0)*avgCharWidth
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painter.drawLine(t, 5, t, -5)
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painter.drawText(t - textCenter, -10, l)
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painter.save()
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painter.setPen(QtGui.QColor(QtCore.Qt.green))
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sliderStartPixel = self.proxy.realToPixel(self.proxy.realStart)
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sliderStopPixel = self.proxy.realToPixel(self.proxy.realStop)
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pixels = linspace(sliderStartPixel, sliderStopPixel,
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self.proxy.numPoints)
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for p in pixels:
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p_int = int(p)
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painter.drawLine(p_int, 0, p_int, 5)
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painter.restore()
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painter.drawText(0, -25, prefix)
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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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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(z, ev.x() -
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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 != self.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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sigStartMoved = QtCore.pyqtSignal(int)
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sigStopMoved = QtCore.pyqtSignal(int)
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noSlider, startSlider, stopSlider = range(3)
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stopStyle = "QSlider::handle {background:red}"
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startStyle = "QSlider::handle {background:blue}"
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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.lastPressed = ScanSlider.noSlider
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self.selectedHandle = ScanSlider.startSlider
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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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# 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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self.dummyStopSlider = QtWidgets.QSlider()
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self.dummyStartSlider.setStyleSheet(ScanSlider.startStyle)
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self.dummyStopSlider.setStyleSheet(ScanSlider.stopStyle)
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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 == ScanSlider.startSlider:
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opt.sliderPosition = self.startPos
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opt.sliderValue = self.startVal
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elif handle == ScanSlider.stopSlider:
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opt.sliderPosition = self.stopPos
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opt.sliderValue = self.stopVal
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else:
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pass # AssertionErrors
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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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gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderGroove,
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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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sliderLength = sr.width()
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sliderStart = gr.x()
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# For historical reasons right() returns left()+width() - 1
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# x() is equivalent to left().
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sliderStop = gr.right() - sliderLength + 1
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rangeVal = QtWidgets.QStyle.sliderValueFromPosition(
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self.minimum(), self.maximum(), pos - sliderStart,
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sliderStop - sliderStart, opt.upsideDown)
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return rangeVal
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def rangeValueToPixelPos(self, val):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderGroove,
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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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sliderLength = sr.width()
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sliderStart = gr.x()
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sliderStop = gr.right() - sliderLength + 1
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pixel = QtWidgets.QStyle.sliderPositionFromValue(
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self.minimum(), self.maximum(), val, sliderStop - sliderStart,
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opt.upsideDown)
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return pixel
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# When calculating conversions to/from pixel space, not all of the slider's
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# width is actually usable, because the slider handle has a nonzero width.
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# We use this function as a helper when the axis needs slider information.
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def handleWidth(self):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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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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return sr.width()
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def effectiveWidth(self):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderGroove,
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self)
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sliderLength = self.handleWidth()
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sliderStart = gr.x()
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sliderStop = gr.right() - sliderLength + 1
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return sliderStop - sliderStart
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# If groove and axis are not aligned (and they should be), we can use
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# this function to calculate the offset between them.
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def grooveX(self):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderGroove,
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self)
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return gr.x()
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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 == ScanSlider.startSlider and
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(self.startVal == self.minimum() or
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self.startVal == self.maximum()))
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stopAtEdges = (handle == ScanSlider.stopSlider 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.lastPressed = handle
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self.setSliderDown(True)
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self.selectedHandle = handle
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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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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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self.initHandleStyleOption(opt, handle)
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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 setStartValue(self, val):
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self.setSpan(val, self.stopVal)
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def setStopValue(self, val):
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self.setSpan(self.startVal, val)
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def setSpan(self, lower, upper):
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# TODO: Is bound() necessary? QStyle::sliderPositionFromValue appears
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# to clamp already.
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def bound(min, curr, max):
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if curr < min:
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return min
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elif curr > max:
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return max
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else:
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return curr
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low = bound(self.minimum(), lower, self.maximum())
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high = bound(self.minimum(), upper, 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 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.setStartValue(val)
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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.setStopValue(val)
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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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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, ScanSlider.stopSlider)
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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,
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ScanSlider.startSlider)
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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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ev.accept()
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def mouseMoveEvent(self, ev):
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if (self.lowerPressed != QtWidgets.QStyle.SC_SliderHandle and
|
|
|
|
self.upperPressed != QtWidgets.QStyle.SC_SliderHandle):
|
|
|
|
ev.ignore()
|
|
|
|
return
|
|
|
|
|
|
|
|
opt = QtWidgets.QStyleOptionSlider()
|
|
|
|
self.initStyleOption(opt)
|
|
|
|
|
|
|
|
# This code seems to be needed so that returning the slider to the
|
|
|
|
# previous position is honored if a drag distance is exceeded.
|
|
|
|
m = self.style().pixelMetric(QtWidgets.QStyle.PM_MaximumDragDistance,
|
|
|
|
opt, self)
|
|
|
|
newPos = self.pixelPosToRangeValue(ev.pos().x() - self.offset)
|
|
|
|
|
|
|
|
if m >= 0:
|
|
|
|
r = self.rect().adjusted(-m, -m, m, m)
|
|
|
|
if not r.contains(ev.pos()):
|
|
|
|
newPos = self.position
|
|
|
|
|
|
|
|
if self.firstMovement:
|
2016-03-08 19:35:13 +08:00
|
|
|
if self.startPos == self.stopPos:
|
|
|
|
# StopSlider is preferred, except in the case where
|
|
|
|
# start == max possible value the slider can take.
|
|
|
|
if self.startPos == self.maximum():
|
2016-02-26 03:34:04 +08:00
|
|
|
self.lowerPressed = QtWidgets.QStyle.SC_SliderHandle
|
|
|
|
self.upperPressed = QtWidgets.QStyle.SC_None
|
|
|
|
self.firstMovement = False
|
|
|
|
|
|
|
|
if self.lowerPressed == QtWidgets.QStyle.SC_SliderHandle:
|
2016-03-08 19:35:13 +08:00
|
|
|
self.setStartPosition(newPos)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
if self.upperPressed == QtWidgets.QStyle.SC_SliderHandle:
|
2016-03-08 19:35:13 +08:00
|
|
|
self.setStopPosition(newPos)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
ev.accept()
|
|
|
|
|
|
|
|
def mouseReleaseEvent(self, ev):
|
|
|
|
QtWidgets.QSlider.mouseReleaseEvent(self, ev)
|
|
|
|
self.setSliderDown(False) # AbstractSlider needs this
|
|
|
|
self.lowerPressed = QtWidgets.QStyle.SC_None
|
|
|
|
self.upperPressed = QtWidgets.QStyle.SC_None
|
|
|
|
|
|
|
|
def paintEvent(self, ev):
|
|
|
|
# Use QStylePainters to make redrawing as painless as possible.
|
|
|
|
painter = QtWidgets.QStylePainter(self)
|
|
|
|
# Paint on the custom widget, using the attributes of the fake
|
|
|
|
# slider references we keep around. setStyleSheet within paintEvent
|
|
|
|
# leads to heavy performance penalties (and recursion?).
|
|
|
|
# QPalettes would be nicer to use, since palette entries can be set
|
|
|
|
# individually for each slider handle, but Windows 7 does not
|
|
|
|
# use them. This seems to be the only way to override the colors
|
|
|
|
# regardless of platform.
|
2016-03-08 19:35:13 +08:00
|
|
|
startPainter = QtWidgets.QStylePainter(self, self.dummyStartSlider)
|
|
|
|
stopPainter = QtWidgets.QStylePainter(self, self.dummyStopSlider)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
# Groove
|
|
|
|
opt = QtWidgets.QStyleOptionSlider()
|
|
|
|
self.initStyleOption(opt)
|
|
|
|
opt.sliderValue = 0
|
|
|
|
opt.sliderPosition = 0
|
|
|
|
opt.subControls = QtWidgets.QStyle.SC_SliderGroove
|
|
|
|
painter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
|
|
|
|
|
|
|
|
# Handles
|
2016-03-08 19:35:13 +08:00
|
|
|
# Qt will snap sliders to 0 or maximum() if given a desired pixel
|
|
|
|
# location outside the mapped range. So we manually just don't draw
|
|
|
|
# the handles if they are at 0 or max.
|
|
|
|
if self.startVal > 0 and self.startVal < self.maximum():
|
|
|
|
self.drawHandle(startPainter, ScanSlider.startSlider)
|
|
|
|
if self.stopVal > 0 and self.stopVal < self.maximum():
|
|
|
|
self.drawHandle(stopPainter, ScanSlider.stopSlider)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
|
|
|
|
# real (Sliders) => pixel (one pixel movement of sliders would increment by X)
|
|
|
|
# => range (minimum granularity that sliders understand).
|
|
|
|
class ScanProxy(QtCore.QObject):
|
2016-03-08 19:35:13 +08:00
|
|
|
sigStartMoved = QtCore.pyqtSignal(float)
|
|
|
|
sigStopMoved = QtCore.pyqtSignal(float)
|
|
|
|
sigNumPoints = QtCore.pyqtSignal(int)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def __init__(self, slider, axis, rangeFactor):
|
|
|
|
QtCore.QObject.__init__(self)
|
|
|
|
self.axis = axis
|
|
|
|
self.slider = slider
|
2016-03-08 19:35:13 +08:00
|
|
|
self.realStart = 0
|
|
|
|
self.realStop = 0
|
2016-02-26 03:34:04 +08:00
|
|
|
self.numPoints = 10
|
|
|
|
self.rangeFactor = rangeFactor
|
|
|
|
|
|
|
|
# Transform that maps the spinboxes to a pixel position on the
|
|
|
|
# axis. 0 to axis.width() exclusive indicate positions which will be
|
|
|
|
# displayed on the axis.
|
|
|
|
# Because the axis's width will change when placed within a layout,
|
|
|
|
# the realToPixelTransform will initially be invalid. It will be set
|
|
|
|
# properly during the first resizeEvent, with the below transform.
|
|
|
|
self.realToPixelTransform = self.calculateNewRealToPixel(
|
|
|
|
-self.axis.width()/2, 1.0)
|
|
|
|
self.invalidOldSizeExpected = True
|
|
|
|
|
|
|
|
# What real value should map to the axis/slider left? This doesn't depend
|
|
|
|
# on any public members so we can make decisions about centering during
|
|
|
|
# resize and zoom events.
|
|
|
|
def calculateNewRealToPixel(self, targetLeft, targetScale):
|
|
|
|
return QtGui.QTransform.fromScale(targetScale, 1).translate(
|
|
|
|
-targetLeft, 0)
|
|
|
|
|
|
|
|
# pixel vals for sliders: 0 to slider_width - 1
|
|
|
|
def realToPixel(self, val):
|
2016-03-08 19:35:13 +08:00
|
|
|
rawVal = (QtCore.QPointF(val, 0) * self.realToPixelTransform).x()
|
|
|
|
# Clamp pixel values to 32 bits, b/c Qt will otherwise wrap values.
|
|
|
|
if rawVal < -(2**31):
|
|
|
|
rawVal = -(2**31)
|
|
|
|
elif rawVal > (2**31 - 1):
|
|
|
|
rawVal = (2**31 - 1)
|
|
|
|
return rawVal
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
# Get a point from pixel units to what the sliders display.
|
|
|
|
def pixelToReal(self, val):
|
|
|
|
(revXform, invertible) = self.realToPixelTransform.inverted()
|
|
|
|
if not invertible:
|
|
|
|
revXform = (QtGui.QTransform.fromTranslate(
|
|
|
|
-self.realToPixelTransform.dx(), 0) *
|
|
|
|
QtGui.QTransform.fromScale(
|
|
|
|
1/self.realToPixelTransform.m11(), 0))
|
|
|
|
realPoint = QtCore.QPointF(val, 0) * revXform
|
|
|
|
return realPoint.x()
|
|
|
|
|
|
|
|
def rangeToReal(self, val):
|
|
|
|
# gx = self.slider.grooveX()
|
|
|
|
# ax = self.axis.x()
|
|
|
|
# assert gx == ax, "gx: {}, ax: {}".format(gx, ax)
|
|
|
|
pixelVal = self.slider.rangeValueToPixelPos(val)
|
|
|
|
return self.pixelToReal(pixelVal)
|
|
|
|
|
|
|
|
def realToRange(self, val):
|
|
|
|
pixelVal = self.realToPixel(val)
|
|
|
|
return self.slider.pixelPosToRangeValue(pixelVal)
|
|
|
|
|
2016-03-08 19:35:13 +08:00
|
|
|
def moveStop(self, val):
|
2016-02-26 03:34:04 +08:00
|
|
|
sliderX = self.realToRange(val)
|
2016-03-08 19:35:13 +08:00
|
|
|
self.slider.setStopPosition(sliderX)
|
|
|
|
self.realStop = val
|
|
|
|
self.axis.update() # Number of points ticks changed positions.
|
2016-02-26 03:34:04 +08:00
|
|
|
|
2016-03-08 19:35:13 +08:00
|
|
|
def moveStart(self, val):
|
2016-02-26 03:34:04 +08:00
|
|
|
sliderX = self.realToRange(val)
|
2016-03-08 19:35:13 +08:00
|
|
|
self.slider.setStartPosition(sliderX)
|
|
|
|
self.realStart = val
|
|
|
|
self.axis.update()
|
|
|
|
|
|
|
|
def handleStopMoved(self, rangeVal):
|
|
|
|
self.sigStopMoved.emit(self.rangeToReal(rangeVal))
|
|
|
|
|
|
|
|
def handleStartMoved(self, rangeVal):
|
|
|
|
self.sigStartMoved.emit(self.rangeToReal(rangeVal))
|
2016-02-26 03:34:04 +08:00
|
|
|
|
2016-03-08 19:35:13 +08:00
|
|
|
def handleNumPoints(self, inc):
|
|
|
|
self.sigNumPoints.emit(self.numPoints + inc)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
2016-03-08 19:35:13 +08:00
|
|
|
def setNumPoints(self, val):
|
|
|
|
self.numPoints = val
|
|
|
|
self.axis.update()
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def handleZoom(self, zoomFactor, mouseXPos):
|
|
|
|
newScale = self.realToPixelTransform.m11() * zoomFactor
|
|
|
|
refReal = self.pixelToReal(mouseXPos)
|
|
|
|
newLeft = refReal - mouseXPos/newScale
|
|
|
|
self.realToPixelTransform = self.calculateNewRealToPixel(
|
|
|
|
newLeft, newScale)
|
2016-03-08 19:35:13 +08:00
|
|
|
self.moveStop(self.realStop)
|
|
|
|
self.moveStart(self.realStart)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def zoomToFit(self):
|
2016-03-08 19:35:13 +08:00
|
|
|
currRangeReal = abs(self.realStop - self.realStart)
|
|
|
|
# Slider closest to the left should be used to find the new axis left.
|
|
|
|
if self.realStop < self.realStart:
|
|
|
|
refSlider = self.realStop
|
|
|
|
else:
|
|
|
|
refSlider = self.realStart
|
|
|
|
if self.rangeFactor <= 2:
|
|
|
|
return # Ill-formed snap range- do nothing.
|
2016-02-26 03:34:04 +08:00
|
|
|
proportion = self.rangeFactor/(self.rangeFactor - 2)
|
|
|
|
newScale = self.slider.effectiveWidth()/(proportion*currRangeReal)
|
2016-03-08 19:35:13 +08:00
|
|
|
newLeft = refSlider - self.slider.effectiveWidth() \
|
2016-02-26 03:34:04 +08:00
|
|
|
/ (self.rangeFactor*newScale)
|
|
|
|
self.realToPixelTransform = self.calculateNewRealToPixel(
|
|
|
|
newLeft, newScale)
|
|
|
|
self.printTransform()
|
2016-03-08 19:35:13 +08:00
|
|
|
self.moveStop(self.realStop)
|
|
|
|
self.moveStart(self.realStart)
|
|
|
|
self.axis.update() # Axis normally takes care to update itself during
|
|
|
|
# zoom. In this code path however, the zoom didn't arrive via the axis
|
|
|
|
# widget, so we need to notify manually.
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def fitToView(self):
|
|
|
|
lowRange = 1.0/self.rangeFactor
|
|
|
|
highRange = (self.rangeFactor - 1)/self.rangeFactor
|
2016-03-08 19:35:13 +08:00
|
|
|
newStart = self.pixelToReal(lowRange * self.slider.effectiveWidth())
|
|
|
|
newStop = self.pixelToReal(highRange * self.slider.effectiveWidth())
|
2016-02-26 03:34:04 +08:00
|
|
|
sliderRange = self.slider.maximum() - self.slider.minimum()
|
|
|
|
# Signals won't fire unless slider was actually grabbed, so
|
|
|
|
# manually update so the spinboxes know that knew values were set.
|
2016-03-08 19:35:13 +08:00
|
|
|
# self.realStop/Start and the sliders themselves will be updated as a
|
|
|
|
# consequence of ValueChanged signal in spinboxes. The slider widget
|
|
|
|
# has guards against recursive signals in setSpan().
|
|
|
|
if sliderRange > 0:
|
|
|
|
self.sigStopMoved.emit(newStop)
|
|
|
|
self.sigStartMoved.emit(newStart)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def eventFilter(self, obj, ev):
|
|
|
|
if obj != self.axis:
|
|
|
|
return False
|
|
|
|
if ev.type() != QtCore.QEvent.Resize:
|
|
|
|
return False
|
|
|
|
if ev.oldSize().isValid():
|
2016-03-08 19:35:13 +08:00
|
|
|
oldLeft = self.pixelToReal(0)
|
2016-02-26 03:34:04 +08:00
|
|
|
refWidth = ev.oldSize().width() - self.slider.handleWidth()
|
|
|
|
refRight = self.pixelToReal(refWidth)
|
|
|
|
newWidth = ev.size().width() - self.slider.handleWidth()
|
2016-03-08 19:35:13 +08:00
|
|
|
# assert refRight > oldLeft
|
2016-02-26 03:34:04 +08:00
|
|
|
newScale = newWidth/(refRight - oldLeft)
|
|
|
|
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.invalidOldSizeExpected = False
|
|
|
|
self.realToPixelTransform = self.calculateNewRealToPixel(
|
|
|
|
oldLeft, newScale)
|
|
|
|
# assert self.pixelToReal(0) == oldLeft, \
|
|
|
|
# "{}, {}".format(self.pixelToReal(0), oldLeft)
|
|
|
|
# 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.
|
|
|
|
return False
|
|
|
|
|
|
|
|
def printTransform(self):
|
|
|
|
print("m11: {}, dx: {}".format(
|
|
|
|
self.realToPixelTransform.m11(), self.realToPixelTransform.dx()))
|
|
|
|
(inverted, invertible) = self.realToPixelTransform.inverted()
|
|
|
|
print("m11: {}, dx: {}, singular: {}".format(
|
|
|
|
inverted.m11(), inverted.dx(), not invertible))
|
|
|
|
|
|
|
|
|
|
|
|
class ScanWidget(QtWidgets.QWidget):
|
2016-03-08 19:35:13 +08:00
|
|
|
sigStartMoved = QtCore.pyqtSignal(float)
|
|
|
|
sigStopMoved = QtCore.pyqtSignal(float)
|
|
|
|
sigNumChanged = QtCore.pyqtSignal(int)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def __init__(self, zoomFactor=1.05, rangeFactor=6):
|
|
|
|
QtWidgets.QWidget.__init__(self)
|
2016-03-08 23:43:04 +08:00
|
|
|
self.slider = slider = ScanSlider()
|
|
|
|
self.axis = axis = ScanAxis(zoomFactor)
|
2016-02-26 03:34:04 +08:00
|
|
|
zoomFitButton = QtWidgets.QPushButton("View Range")
|
|
|
|
fitViewButton = QtWidgets.QPushButton("Snap Range")
|
|
|
|
self.proxy = ScanProxy(slider, axis, rangeFactor)
|
|
|
|
axis.proxy = self.proxy
|
2016-03-08 19:35:13 +08:00
|
|
|
axis.slider = slider
|
|
|
|
slider.setMaximum(1023)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
# Layout.
|
|
|
|
layout = QtWidgets.QGridLayout()
|
|
|
|
# Default size will cause axis to disappear otherwise.
|
|
|
|
layout.setRowMinimumHeight(0, 40)
|
|
|
|
layout.addWidget(axis, 0, 0, 1, -1)
|
|
|
|
layout.addWidget(slider, 1, 0, 1, -1)
|
|
|
|
layout.addWidget(zoomFitButton, 2, 0)
|
|
|
|
layout.addWidget(fitViewButton, 2, 1)
|
|
|
|
self.setLayout(layout)
|
|
|
|
|
|
|
|
# Connect signals
|
2016-03-08 19:35:13 +08:00
|
|
|
slider.sigStopMoved.connect(self.proxy.handleStopMoved)
|
|
|
|
slider.sigStartMoved.connect(self.proxy.handleStartMoved)
|
|
|
|
self.proxy.sigStopMoved.connect(self.sigStopMoved)
|
|
|
|
self.proxy.sigStartMoved.connect(self.sigStartMoved)
|
|
|
|
self.proxy.sigNumPoints.connect(self.sigNumChanged)
|
2016-02-26 03:34:04 +08:00
|
|
|
axis.sigZoom.connect(self.proxy.handleZoom)
|
2016-03-08 19:35:13 +08:00
|
|
|
axis.sigPoints.connect(self.proxy.handleNumPoints)
|
2016-02-26 03:34:04 +08:00
|
|
|
fitViewButton.clicked.connect(self.fitToView)
|
|
|
|
zoomFitButton.clicked.connect(self.zoomToFit)
|
|
|
|
|
|
|
|
# Connect event observers.
|
2016-03-08 19:35:13 +08:00
|
|
|
axis.installEventFilter(self.proxy)
|
|
|
|
slider.installEventFilter(axis)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
# Spinbox and button slots. Any time the spinboxes change, ScanWidget
|
|
|
|
# mirrors it and passes the information to the proxy.
|
2016-03-08 19:35:13 +08:00
|
|
|
def setStop(self, val):
|
|
|
|
self.proxy.moveStop(val)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
2016-03-08 19:35:13 +08:00
|
|
|
def setStart(self, val):
|
|
|
|
self.proxy.moveStart(val)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def setNumPoints(self, val):
|
2016-03-08 19:35:13 +08:00
|
|
|
self.proxy.setNumPoints(val)
|
2016-02-26 03:34:04 +08:00
|
|
|
|
|
|
|
def zoomToFit(self):
|
|
|
|
self.proxy.zoomToFit()
|
|
|
|
|
|
|
|
def fitToView(self):
|
|
|
|
self.proxy.fitToView()
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def reset(self):
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self.proxy.reset()
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