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scanwidget: rewrite, pending drawing area (3de1505)

This commit is contained in:
Robert Jördens 2016-03-16 15:13:31 +01:00
parent 0e1f75ec49
commit d858ad4180
2 changed files with 195 additions and 358 deletions

View File

@ -158,8 +158,6 @@ class _RangeScan(LayoutWidget):
scanner.setMinimumSize(150, 0)
scanner.setSizePolicy(QtWidgets.QSizePolicy(
QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Fixed))
disable_scroll_wheel(scanner.axis)
disable_scroll_wheel(scanner.slider)
self.addWidget(scanner, 0, 0, -1, 1)
self.min = ScientificSpinBox()
@ -191,17 +189,17 @@ class _RangeScan(LayoutWidget):
def update_npoints(value):
state["npoints"] = value
scanner.setNumPoints(value)
scanner.setNum(value)
scanner.sigStartMoved.connect(self.min.setValue)
scanner.sigNumChanged.connect(self.npoints.setValue)
scanner.sigStopMoved.connect(self.max.setValue)
scanner.startChanged.connect(self.min.setValue)
scanner.numChanged.connect(self.npoints.setValue)
scanner.stopChanged.connect(self.max.setValue)
self.min.valueChanged.connect(update_min)
self.npoints.valueChanged.connect(update_npoints)
self.max.valueChanged.connect(update_max)
self.min.setValue(state["min"]/scale)
self.npoints.setValue(state["npoints"])
self.max.setValue(state["max"]/scale)
scanner.setStart(state["min"]/scale)
scanner.setNum(state["npoints"])
scanner.setStop(state["max"]/scale)
apply_properties(self.min)
apply_properties(self.max)

View File

@ -1,7 +1,7 @@
import logging
from PyQt5 import QtGui, QtCore, QtWidgets
from numpy import linspace
import numpy as np
from .ticker import Ticker
@ -9,119 +9,111 @@ from .ticker import Ticker
logger = logging.getLogger(__name__)
class ScanAxis(QtWidgets.QWidget):
def __init__(self):
QtWidgets.QWidget.__init__(self)
self.proxy = None
self.sizePolicy().setControlType(QtWidgets.QSizePolicy.ButtonBox)
self.ticker = Ticker()
qfm = QtGui.QFontMetrics(QtGui.QFont())
lineSpacing = qfm.lineSpacing()
descent = qfm.descent()
self.setMinimumHeight(2*lineSpacing + descent + 5 + 5)
class ScanWidget(QtWidgets.QSlider):
startChanged = QtCore.pyqtSignal(float)
stopChanged = QtCore.pyqtSignal(float)
numChanged = QtCore.pyqtSignal(int)
def paintEvent(self, ev):
painter = QtGui.QPainter(self)
qfm = QtGui.QFontMetrics(painter.font())
avgCharWidth = qfm.averageCharWidth()
lineSpacing = qfm.lineSpacing()
descent = qfm.descent()
painter.setRenderHint(QtGui.QPainter.Antialiasing)
# The center of the slider handles should reflect what's displayed
# on the spinboxes.
painter.translate(self.proxy.slider.handleWidth()/2, self.height() - 5)
painter.drawLine(0, 0, self.width(), 0)
realLeft = self.proxy.pixelToReal(0)
realRight = self.proxy.pixelToReal(self.width())
ticks, prefix, labels = self.ticker(realLeft, realRight)
painter.drawText(0, -5-descent-lineSpacing, prefix)
pen = QtGui.QPen()
pen.setWidth(2)
painter.setPen(pen)
for t, l in zip(ticks, labels):
t = self.proxy.realToPixel(t)
painter.drawLine(t, 0, t, -5)
painter.drawText(t - len(l)/2*avgCharWidth, -5-descent, l)
sliderStartPixel = self.proxy.realToPixel(self.proxy.realStart)
sliderStopPixel = self.proxy.realToPixel(self.proxy.realStop)
pixels = linspace(sliderStartPixel, sliderStopPixel,
self.proxy.numPoints)
for p in pixels:
p_int = int(p)
painter.drawLine(p_int, 0, p_int, 5)
ev.accept()
# Basic ideas from https://gist.github.com/Riateche/27e36977f7d5ea72cf4f
class ScanSlider(QtWidgets.QSlider):
sigStartMoved = QtCore.pyqtSignal(int)
sigStopMoved = QtCore.pyqtSignal(int)
def __init__(self):
def __init__(self, zoomFactor=1.05, zoomMargin=.1, dynamicRange=1e9):
QtWidgets.QSlider.__init__(self, QtCore.Qt.Horizontal)
self.startVal = None
self.stopVal = None
self.offset = None
self.position = None
self.pressed = None
self.zoomMargin = zoomMargin
self.dynamicRange = dynamicRange
self.zoomFactor = zoomFactor
self.setRange(0, (1 << 15) - 1)
self.ticker = Ticker()
# We need fake sliders to keep around so that we can dynamically
# set the stylesheets for drawing each slider later. See paintEvent.
# 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.
self.dummyStartSlider = QtWidgets.QSlider()
self.dummyStopSlider = QtWidgets.QSlider()
self.dummyStartSlider.setStyleSheet(
"QSlider::handle {background:blue}")
self.dummyStopSlider.setStyleSheet(
"QSlider::handle {background:red}")
self.menu = QtWidgets.QMenu(self)
action = QtWidgets.QAction("&View Range", self)
action.triggered.connect(self.viewRange)
self.menu.addAction(action)
action = QtWidgets.QAction("&Snap Range", self)
action.triggered.connect(self.snapRange)
self.menu.addAction(action)
def pixelPosToRangeValue(self, pos):
self._startSlider = QtWidgets.QSlider()
self._startSlider.setStyleSheet("QSlider::handle {background:blue}")
self._stopSlider = QtWidgets.QSlider()
self._stopSlider.setStyleSheet("QSlider::handle {background:red}")
self.setRange(0, 4095)
self._start, self._stop, self._num = None, None, None
self._axisView, self._sliderView = None, None
self._offset, self._pressed = None, None
def contextMenuEvent(self, ev):
self.menu.popup(ev.globalPos())
def _axisToPixel(self, val):
a, b = self._axisView
return a + val*b
def _pixelToAxis(self, val):
a, b = self._axisView
return (val - a)/b
def _setView(self, axis_left, axis_scale):
opt = QtWidgets.QStyleOptionSlider()
self.initStyleOption(opt)
gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
g = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
QtWidgets.QStyle.SC_SliderGroove,
self)
rangeVal = QtWidgets.QStyle.sliderValueFromPosition(
self.minimum(), self.maximum(), pos - gr.x(),
self.effectiveWidth(), opt.upsideDown)
return rangeVal
def rangeValueToPixelPos(self, val):
opt = QtWidgets.QStyleOptionSlider()
self.initStyleOption(opt)
pixel = QtWidgets.QStyle.sliderPositionFromValue(
self.minimum(), self.maximum(), val, self.effectiveWidth(),
opt.upsideDown)
return pixel
# When calculating conversions to/from pixel space, not all of the slider's
# width is actually usable, because the slider handle has a nonzero width.
# We use this function as a helper when the axis needs slider information.
def handleWidth(self):
opt = QtWidgets.QStyleOptionSlider()
self.initStyleOption(opt)
sr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
h = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
QtWidgets.QStyle.SC_SliderHandle,
self)
return sr.width()
slider_left = g.x() + h.width()/2
slider_scale = (self.maximum() - self.minimum())/(
g.width() - h.width())
def effectiveWidth(self):
opt = QtWidgets.QStyleOptionSlider()
self.initStyleOption(opt)
gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
QtWidgets.QStyle.SC_SliderGroove,
self)
return gr.width() - self.handleWidth()
self._axisView = axis_left, axis_scale
self._sliderView = ((axis_left - slider_left)*slider_scale,
axis_scale*slider_scale)
self.update()
def setStart(self, val):
if self._start == val:
return
self._start = val
self.update()
self.startChanged.emit(val)
def setStop(self, val):
if self._stop == val:
return
self._stop = val
self.update()
self.stopChanged.emit(val)
def setNum(self, val):
if self._num == val:
return
self._num = val
self.update()
self.numChanged.emit(val)
def viewRange(self):
center = (self._stop + self._start)/2
scale = self.width()*(1 - 2*self.zoomMargin)
if self._stop != self._start:
scale /= abs(self._stop - self._start)
if center:
scale = min(scale, self.dynamicRange/abs(center))
else:
scale = self.dynamicRange
if center:
scale /= abs(center)
left = self.width()/2 - center*scale
self._setView(left, scale)
def snapRange(self):
self.setStart(self._pixelToAxis(self.zoomMargin*self.width()))
self.setStop(self._pixelToAxis((1 - self.zoomMargin)*self.width()))
def _getStyleOptionSlider(self, val):
a, b = self._sliderView
val = a + val*b
if not (self.minimum() <= val <= self.maximum()):
return None
opt = QtWidgets.QStyleOptionSlider()
self.initStyleOption(opt)
opt.sliderPosition = val
@ -130,284 +122,131 @@ class ScanSlider(QtWidgets.QSlider):
return opt
def _hitHandle(self, pos, val):
# If chosen slider at edge, treat it as non-interactive.
if not (self.minimum() < val < self.maximum()):
return False
opt = self._getStyleOptionSlider(val)
if not opt:
return False
control = self.style().hitTestComplexControl(
QtWidgets.QStyle.CC_Slider, opt, pos, self)
if control != QtWidgets.QStyle.SC_SliderHandle:
return False
sr = self.style().subControlRect(
QtWidgets.QStyle.CC_Slider, opt,
QtWidgets.QStyle.SC_SliderHandle, self)
self.offset = pos.x() - sr.topLeft().x()
sr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
QtWidgets.QStyle.SC_SliderHandle,
self)
self._offset = pos.x() - sr.center().x()
self.setSliderDown(True)
# Needed?
self.update(sr)
return True
def setStartPosition(self, val):
if val == self.startVal:
return
self.startVal = val
self.update()
def setStopPosition(self, val):
if val == self.stopVal:
return
self.stopVal = val
self.update()
def mousePressEvent(self, ev):
if ev.buttons() ^ ev.button():
ev.ignore()
return
# Prefer stopVal in the default case.
if self._hitHandle(ev.pos(), self.stopVal):
self.pressed = "stop"
elif self._hitHandle(ev.pos(), self.startVal):
self.pressed = "start"
if self._hitHandle(ev.pos(), self._stop):
self._pressed = "stop"
elif self._hitHandle(ev.pos(), self._start):
self._pressed = "start"
else:
self.pressed = None
ev.accept()
self._pressed = None
def mouseMoveEvent(self, ev):
if not self.pressed:
if not self._pressed:
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.pressed == "start":
self.setStartPosition(newPos)
val = self._pixelToAxis(ev.pos().x() - self._offset)
if self._pressed == "stop":
self._stop = val
self.update()
if self.hasTracking():
self.sigStartMoved.emit(self.startVal)
elif self.pressed == "stop":
self.setStopPosition(newPos)
self.stopChanged.emit(val)
elif self._pressed == "start":
self._start = val
self.update()
if self.hasTracking():
self.sigStopMoved.emit(self.stopVal)
ev.accept()
self.startChanged.emit(val)
def mouseReleaseEvent(self, ev):
QtWidgets.QSlider.mouseReleaseEvent(self, ev)
self.setSliderDown(False) # AbstractSlider needs this
if not self.hasTracking():
if self.pressed == "start":
self.sigStartMoved.emit(self.startVal)
elif self.pressed == "stop":
self.sigStopMoved.emit(self.stopVal)
self.pressed = None
self.setSliderDown(False)
if self._pressed == "start":
self.startChanged.emit(self._start)
elif self._pressed == "stop":
self.stopChanged.emit(self._stop)
self._pressed = None
def paintEvent(self, ev):
# Use the pre-parsed, styled sliders.
startPainter = QtWidgets.QStylePainter(self, self.dummyStartSlider)
stopPainter = QtWidgets.QStylePainter(self, self.dummyStopSlider)
# Only draw handles that are not railed
if self.minimum() < self.startVal < self.maximum():
opt = self._getStyleOptionSlider(self.startVal)
startPainter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
if self.minimum() < self.stopVal < self.maximum():
opt = self._getStyleOptionSlider(self.stopVal)
stopPainter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
# real (Sliders) => pixel (one pixel movement of sliders would increment by X)
# => range (minimum granularity that sliders understand).
class ScanWidget(QtWidgets.QWidget):
sigStartMoved = QtCore.pyqtSignal(float)
sigStopMoved = QtCore.pyqtSignal(float)
sigNumChanged = QtCore.pyqtSignal(int)
def __init__(self, zoomFactor=1.05, zoomMargin=.1, dynamicRange=1e9):
QtWidgets.QWidget.__init__(self)
self.slider = slider = ScanSlider()
self.axis = axis = ScanAxis()
axis.proxy = self
# Layout.
layout = QtWidgets.QVBoxLayout()
layout.setSpacing(0)
layout.addWidget(axis)
layout.addWidget(slider)
self.setLayout(layout)
# Context menu entries
self.menu = QtWidgets.QMenu(self)
viewRangeAct = QtWidgets.QAction("&View Range", self)
viewRangeAct.triggered.connect(self.viewRange)
self.menu.addAction(viewRangeAct)
snapRangeAct = QtWidgets.QAction("&Snap Range", self)
snapRangeAct.triggered.connect(self.snapRange)
self.menu.addAction(snapRangeAct)
self.realStart = None
self.realStop = None
self.numPoints = None
self.zoomMargin = zoomMargin
self.dynamicRange = dynamicRange
self.zoomFactor = zoomFactor
self.realToPixelTransform = -self.axis.width()/2, 1.
# Connect event observers.
axis.installEventFilter(self)
slider.installEventFilter(self)
slider.sigStopMoved.connect(self._handleStopMoved)
slider.sigStartMoved.connect(self._handleStartMoved)
def contextMenuEvent(self, ev):
self.menu.popup(ev.globalPos())
# pixel vals for sliders: 0 to slider_width - 1
def realToPixel(self, val):
a, b = self.realToPixelTransform
rawVal = b*(val - a)
# Clamp pixel values to 32 bits, b/c Qt will otherwise wrap values.
rawVal = min(max(-(1 << 31), rawVal), (1 << 31) - 1)
return rawVal
def pixelToReal(self, val):
a, b = self.realToPixelTransform
return val/b + a
def rangeToReal(self, val):
pixelVal = self.slider.rangeValueToPixelPos(val)
return self.pixelToReal(pixelVal)
def realToRange(self, val):
pixelVal = self.realToPixel(val)
return self.slider.pixelPosToRangeValue(pixelVal)
def setView(self, left, scale):
self.realToPixelTransform = left, scale
sliderX = self.realToRange(self.realStop)
self.slider.setStopPosition(sliderX)
sliderX = self.realToRange(self.realStart)
self.slider.setStartPosition(sliderX)
self.axis.update()
def setStop(self, val):
if self.realStop == val:
def _zoom(self, z, x):
a, b = self._axisView
scale = z*b
left = x - z*(x - a)
if z > 1 and abs(left - self.width()/2) > self.dynamicRange:
return
sliderX = self.realToRange(val)
self.slider.setStopPosition(sliderX)
self.realStop = val
self.axis.update() # Number of points ticks changed positions.
self.sigStopMoved.emit(val)
def setStart(self, val):
if self.realStart == val:
return
sliderX = self.realToRange(val)
self.slider.setStartPosition(sliderX)
self.realStart = val
self.axis.update()
self.sigStartMoved.emit(val)
def setNumPoints(self, val):
if self.numPoints == val:
return
self.numPoints = val
self.axis.update()
self.sigNumChanged.emit(val)
def viewRange(self):
newScale = self.slider.effectiveWidth()/abs(
self.realStop - self.realStart)
newScale *= 1 - 2*self.zoomMargin
newCenter = (self.realStop + self.realStart)/2
if newCenter:
newScale = min(newScale, self.dynamicRange/abs(newCenter))
newLeft = newCenter - self.slider.effectiveWidth()/2/newScale
self.setView(newLeft, newScale)
def snapRange(self):
lowRange = self.zoomMargin
highRange = 1 - self.zoomMargin
newStart = self.pixelToReal(lowRange * self.slider.effectiveWidth())
newStop = self.pixelToReal(highRange * self.slider.effectiveWidth())
self.setStart(newStart)
self.setStop(newStop)
def _handleStartMoved(self, rangeVal):
val = self.rangeToReal(rangeVal)
self.realStart = val
self.axis.update()
self.sigStartMoved.emit(val)
def _handleStopMoved(self, rangeVal):
val = self.rangeToReal(rangeVal)
self.realStop = val
self.axis.update()
self.sigStopMoved.emit(val)
def _handleZoom(self, zoomFactor, mouseXPos):
newScale = self.realToPixelTransform[1] * zoomFactor
refReal = self.pixelToReal(mouseXPos)
newLeft = refReal - mouseXPos/newScale
newZero = newLeft*newScale + self.slider.effectiveWidth()/2
if zoomFactor > 1 and abs(newZero) > self.dynamicRange:
return
self.setView(newLeft, newScale)
self._setView(left, scale)
def wheelEvent(self, ev):
y = ev.angleDelta().y()
y = ev.angleDelta().y()/120.
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.)
self._handleZoom(z, ev.x() - self.slider.handleWidth()/2)
ev.accept()
self.setNum(max(1, self._num + y))
elif ev.modifiers() & QtCore.Qt.ControlModifier:
if y:
self._zoom(self.zoomFactor**y, ev.x())
else:
ev.ignore()
def resizeEvent(self, ev):
if ev.oldSize().isValid():
oldLeft = self.pixelToReal(0)
refWidth = ev.oldSize().width() - self.slider.handleWidth()
refRight = self.pixelToReal(refWidth)
newWidth = ev.size().width() - self.slider.handleWidth()
newScale = newWidth/(refRight - oldLeft)
center = (self.realStop + self.realStart)/2
if center:
newScale = min(newScale, self.dynamicRange/abs(center))
self.setView(oldLeft, newScale)
else:
if not ev.oldSize().isValid():
self.viewRange()
return
a, b = self._axisView
scale = b*ev.size().width()/ev.oldSize().width()
center = (self._stop + self._start)/2
if center:
scale = min(scale, self.dynamicRange/abs(center))
left = a*scale/b
self._setView(left, scale)
def eventFilter(self, obj, ev):
if ev.type() == QtCore.QEvent.Wheel:
ev.ignore()
return True
if ev.type() == QtCore.QEvent.Resize:
ev.ignore()
return True
return False
def paintEvent(self, ev):
self._paintSliders()
self._paintAxis()
def _paintAxis(self):
painter = QtGui.QPainter(self)
qfm = QtGui.QFontMetrics(painter.font())
avgCharWidth = qfm.averageCharWidth()
lineSpacing = qfm.lineSpacing()
descent = qfm.descent()
ascent = qfm.ascent()
height = qfm.height()
# painter.setRenderHint(QtGui.QPainter.Antialiasing)
# TODO: make drawable area big enough and move axis higher
painter.translate(0, ascent - 15)
ticks, prefix, labels = self.ticker(self._pixelToAxis(0),
self._pixelToAxis(self.width()))
painter.drawText(0, 0, prefix)
pen = QtGui.QPen()
pen.setWidth(2)
painter.setPen(pen)
painter.translate(0, lineSpacing)
for t, l in zip(ticks, labels):
t = self._axisToPixel(t)
painter.drawLine(t, descent, t, height/2)
painter.drawText(t - len(l)/2*avgCharWidth, 0, l)
painter.drawLine(0, height/2, self.width(), height/2)
painter.translate(0, height)
for p in np.linspace(self._axisToPixel(self._start),
self._axisToPixel(self._stop),
self._num):
# TODO: is drawing far outside the viewport dangerous?
painter.drawLine(p, 0, p, -height/2)
def _paintSliders(self):
startPainter = QtWidgets.QStylePainter(self, self._startSlider)
stopPainter = QtWidgets.QStylePainter(self, self._stopSlider)
opt = self._getStyleOptionSlider(self._start)
if opt:
startPainter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
opt = self._getStyleOptionSlider(self._stop)
if opt:
stopPainter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)