class SliderControl(QObject):
"""This class implements a slider control for a colormap"""
def __init__(self, name, value, minval, maxval, step, format="%s: %.1f"):
QObject.__init__(self)
self.name, self.value, self.minval, self.maxval, self.step, self.format = \
name, value, minval, maxval, step, format
self._default = value
self._wlabel = None
def makeControlWidgets(self, parent, gridlayout, row, column):
toprow = QWidget(parent)
gridlayout.addWidget(toprow, row * 2, column)
top_lo = QHBoxLayout(toprow)
top_lo.setContentsMargins(0, 0, 0, 0)
self._wlabel = QLabel(self.format % (self.name, self.value), toprow)
top_lo.addWidget(self._wlabel)
self._wreset = QToolButton(toprow)
self._wreset.setText("reset")
self._wreset.setToolButtonStyle(Qt.ToolButtonTextOnly)
self._wreset.setAutoRaise(True)
self._wreset.setEnabled(self.value != self._default)
QObject.connect(self._wreset, SIGNAL("clicked()"), self._resetValue)
top_lo.addWidget(self._wreset)
self._wslider = QwtSlider(parent)
# This works around a stupid bug in QwtSliders -- see comments on histogram zoom wheel above
self._wslider_timer = QTimer(parent)
self._wslider_timer.setSingleShot(True)
self._wslider_timer.setInterval(500)
QObject.connect(self._wslider_timer, SIGNAL("timeout()"), self.setValue)
gridlayout.addWidget(self._wslider, row * 2 + 1, column)
self._wslider.setRange(self.minval, self.maxval)
self._wslider.setStep(self.step)
self._wslider.setValue(self.value)
self._wslider.setTracking(False)
QObject.connect(self._wslider, SIGNAL("valueChanged(double)"), self.setValue)
QObject.connect(self._wslider, SIGNAL("sliderMoved(double)"), self._previewValue)
def _resetValue(self):
self._wslider.setValue(self._default)
self.setValue(self._default)
def setValue(self, value=None, notify=True):
# only update widgets if already created
self.value = value
if self._wlabel is not None:
if value is None:
self.value = value = self._wslider.value()
self._wreset.setEnabled(value != self._default)
self._wlabel.setText(self.format % (self.name, self.value))
# stop timer if being called to finalize the change in value
if notify:
self._wslider_timer.stop()
self.emit(SIGNAL("valueChanged"), self.value)
def _previewValue(self, value):
self.setValue(notify=False)
self._wslider_timer.start(500)
self.emit(SIGNAL("valueMoved"), self.value)
class SliderControl(QObject):
"""This class implements a slider control for a colormap"""
def __init__(self,
name,
value,
minval,
maxval,
step,
format="%s: %.1f"):
QObject.__init__(self)
self.name, self.value, self.minval, self.maxval, self.step, self.format = \
name, value, minval, maxval, step, format
self._default = value
self._wlabel = None
def makeControlWidgets(self, parent, gridlayout, row, column):
toprow = QWidget(parent)
gridlayout.addWidget(toprow, row * 2, column)
top_lo = QHBoxLayout(toprow)
top_lo.setContentsMargins(0, 0, 0, 0)
self._wlabel = QLabel(self.format % (self.name, self.value),
toprow)
top_lo.addWidget(self._wlabel)
self._wreset = QToolButton(toprow)
self._wreset.setText("reset")
self._wreset.setToolButtonStyle(Qt.ToolButtonTextOnly)
self._wreset.setAutoRaise(True)
self._wreset.setEnabled(self.value != self._default)
QObject.connect(self._wreset, SIGNAL("clicked()"),
self._resetValue)
top_lo.addWidget(self._wreset)
self._wslider = QwtSlider(parent)
# This works around a stupid bug in QwtSliders -- see comments on histogram zoom wheel above
self._wslider_timer = QTimer(parent)
self._wslider_timer.setSingleShot(True)
self._wslider_timer.setInterval(500)
QObject.connect(self._wslider_timer, SIGNAL("timeout()"),
self.setValue)
gridlayout.addWidget(self._wslider, row * 2 + 1, column)
self._wslider.setRange(self.minval, self.maxval)
self._wslider.setStep(self.step)
self._wslider.setValue(self.value)
self._wslider.setTracking(False)
QObject.connect(self._wslider, SIGNAL("valueChanged(double)"),
self.setValue)
QObject.connect(self._wslider, SIGNAL("sliderMoved(double)"),
self._previewValue)
def _resetValue(self):
self._wslider.setValue(self._default)
self.setValue(self._default)
def setValue(self, value=None, notify=True):
# only update widgets if already created
self.value = value
if self._wlabel is not None:
if value is None:
self.value = value = self._wslider.value()
self._wreset.setEnabled(value != self._default)
self._wlabel.setText(self.format % (self.name, self.value))
# stop timer if being called to finalize the change in value
if notify:
self._wslider_timer.stop()
self.emit(SIGNAL("valueChanged"), self.value)
def _previewValue(self, value):
self.setValue(notify=False)
self._wslider_timer.start(500)
self.emit(SIGNAL("valueMoved"), self.value)
