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POPython GUI Drag/Drop Problems
 

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  1. POPython GUI Drag/Drop Problems
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    <p>I am having problems with a GUI I'm working on. The idea is to have a tree list of signals and be able to drag them onto the plot. Eventually having a long list of signals and multiple plots etc.. However the code segmentation faults after a seemingly random number of drag &amp; drops (sometimes just one). I've stripped the code to the bare bones so it plots the same curve each time and there is only one 'signal'to choose from; in this case just x^2.</p> <p>Below I've posted the code with the packages it requires.</p> <pre><code>import wx import random import scipy import matplotlib matplotlib.use('WXAgg') from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg from matplotlib.figure import Figure class MainFrame(wx.Frame): ''' Create the mainframe on which all of the other panels are placed. ''' def __init__(self): wx.Frame.__init__(self, parent=None, title="GUI", size=(998,800)) self.SetBackgroundColour('#CCCCCC') self.GUIBox = wx.BoxSizer(wx.HORIZONTAL) self.P = PlotWindow(self) self.DD = DragDrop(self) self.GUIBox.Add(self.DD, 0, wx.LEFT | wx.ALIGN_TOP) self.GUIBox.Add(self.P, 0, wx.LEFT | wx.ALIGN_TOP) self.SetSizer(self.GUIBox) return class PlotWindow(wx.Panel): def __init__(self, parent): wx.Window.__init__(self, parent) self.Figure = Figure() self.Figure.set_size_inches(8.56, 9.115) self.C = FigureCanvasWxAgg(self, -1, self.Figure) self.SP = self.Figure.add_subplot(111) self.a = [0,1,2,3,4,5] self.b = [0,1,4,9,16,25] self.signals = [self.b] def rePlot(self): self.SP.clear() c = scipy.zeros(6) for i in range(0, 6, 1): c[i] = self.b[i]*random.uniform(0, 2) self.SP.plot(self.a,c) self.C.draw() class MyTextDropTarget(wx.TextDropTarget): def __init__(self, objt): wx.TextDropTarget.__init__(self) self.Objt = objt def OnDropText(self, x, y, data): self.Objt.rePlot() class DragDrop(wx.Panel): def __init__(self, parent): wx.Panel.__init__(self, parent, style=wx.BORDER_RAISED) self.SetBackgroundColour('#CCCCCC') self.tree = wx.TreeCtrl(self, -1, size=(270,700)) # Add root root = self.tree.AddRoot("Signals") self.tree.AppendItem(root, "Square") dt = MyTextDropTarget(self.GetParent().P) self.GetParent().P.SetDropTarget(dt) self.Bind(wx.EVT_TREE_BEGIN_DRAG, self.OnDragInit) self.VBox = wx.BoxSizer(wx.VERTICAL) self.VBox.Add(self.tree, 0) self.SetSizer(self.VBox) def OnDragInit(self, event): text = self.tree.GetItemText(event.GetItem()) tdo = wx.TextDataObject(text) tds = wx.DropSource(self.tree) tds.SetData(tdo) tds.DoDragDrop(True) class App(wx.App): def OnInit(self): self.dis = MainFrame() self.dis.Show() return True app = App() app.MainLoop() </code></pre> <p>I've tried to take out as much unnecessary code as possible; any help would be much appreciated!</p> <p>Cheers!</p>
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    1. COSeems to be working fine for me (no crashes) on (wx 2.8.12.1 (mac-unicode) python 2.7.2 osx 10.6.8) Although nothing happens when I drag squares onto the graph? not sure if that's normal?
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    2. COI'm using python 2.5.2 and wx 2.8.9.1. I removed the line of code that made the plotted line random each time by accident. I've changed rePlot in the original post to plot a random line each time now. Does it still work for you?
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    3. COThe plotting works fine if I call it myself, just no drop events are getting fired for me. I monitored it with the inspection tool and there's none I can see, which is why OnDropText wasn't getting called. Sorry I can't help you more
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