77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
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# -*- coding: utf-8 -*-
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from pyqtgraph.Qt import QtCore, QtGui
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if not hasattr(QtCore, 'Signal'):
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QtCore.Signal = QtCore.pyqtSignal
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import weakref
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class CanvasManager(QtCore.QObject):
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SINGLETON = None
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sigCanvasListChanged = QtCore.Signal()
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def __init__(self):
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if CanvasManager.SINGLETON is not None:
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raise Exception("Can only create one canvas manager.")
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CanvasManager.SINGLETON = self
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QtCore.QObject.__init__(self)
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self.canvases = weakref.WeakValueDictionary()
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@classmethod
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def instance(cls):
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return CanvasManager.SINGLETON
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def registerCanvas(self, canvas, name):
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n2 = name
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i = 0
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while n2 in self.canvases:
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n2 = "%s_%03d" % (name, i)
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i += 1
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self.canvases[n2] = canvas
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self.sigCanvasListChanged.emit()
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return n2
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def unregisterCanvas(self, name):
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c = self.canvases[name]
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del self.canvases[name]
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self.sigCanvasListChanged.emit()
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def listCanvases(self):
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return list(self.canvases.keys())
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def getCanvas(self, name):
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return self.canvases[name]
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manager = CanvasManager()
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class CanvasCombo(QtGui.QComboBox):
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def __init__(self, parent=None):
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QtGui.QComboBox.__init__(self, parent)
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man = CanvasManager.instance()
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man.sigCanvasListChanged.connect(self.updateCanvasList)
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self.hostName = None
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self.updateCanvasList()
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def updateCanvasList(self):
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canvases = CanvasManager.instance().listCanvases()
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canvases.insert(0, "")
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if self.hostName in canvases:
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canvases.remove(self.hostName)
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sel = self.currentText()
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if sel in canvases:
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self.blockSignals(True) ## change does not affect current selection; block signals during update
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self.clear()
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for i in canvases:
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self.addItem(i)
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if i == sel:
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self.setCurrentIndex(self.count())
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self.blockSignals(False)
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def setHostName(self, name):
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self.hostName = name
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self.updateCanvasList()
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