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POTrying to make draggable children of a scrolledwindow in wXPython
 

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  1. POTrying to make draggable children of a scrolledwindow in wXPython
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    <p>I am trying to create children whose parent is a ScrolledWindow and intercept mouse drags to allow repositioning children absolutely within the client area of the parent. I want the client virtual scrolled area to expand as needed to accommodate the position of the children (so a larger-than-window graph gets scrolled). The dragging seems to be problematic since it wants to move by the corners all the time trying to drag an object left or up is problematic. It's also not scrolling when the widgets go beyond the current window boundaries. In the driver using this code all the ConceptNode widgets specify the SemNetWidget as their parent. I'm not using using a sizer since the absolute positioning (dragged positions) of the children should be maintained. I don't suppose wxPython provides a way to position objects by centers rather than by corners as it would make some of this much easier to code:</p> <pre><code>class SemNetWidget(wx.ScrolledWindow): def __init__(self,edit,*args,**kwargs): self.editor=edit super(SemNetWidget,self).__init__(*args,**kwargs) self.SetScrollbars(1,1,1,1) class ConceptNode(wx.StaticText): count=0 def __init__(self,nm,*args,**kwargs): if not kwargs.has_key("style"): kwargs["style"]=0 kwargs["style"]=wx.SIMPLE_BORDER|wx.ALIGN_CENTRE super(ConceptNode,self).__init__(*args,**kwargs) par=args[0] self.nm=nm self.mcap=False self.par=par self.SetLabel(" %s " % self.nm) self.Move((0,15*self.count)) # so new nodes don't overlap self.par.FitInside() self.Bind(wx.EVT_MOUSE_EVENTS,self.onDrag) self.Bind(wx.EVT_MOTION,self.onDrag) self.Bind(wx.EVT_MOUSE_CAPTURE_LOST,self.onUncap) ConceptNode.count+=1 def onUncap(self,evt): self.mcap=False self.drag=None def onDrag(self,evt): if evt.Dragging() and self.drag is not None: #cdc=wx.ClientDC(self) #self.PrepareDC(cdc) #pos=list(evt.GetLogicalPosition(cdc)) pos=evt.GetPosition() dx=pos[0]-self.drag['x'] dy=pos[1]-self.drag['y'] self.SetPosition((self.drag['ox']+dx, self.drag['oy']+dy), wx.SIZE_ALLOW_MINUS_ONE) if evt.LeftDown(): pos=evt.GetPosition() opos=self.GetPosition() self.drag={'x':pos[0],'y':pos[1], 'ox':opos[0],'oy':opos[1]} self.CaptureMouse() self.mcap=True evt.Skip() if evt.LeftUp(): self.drag=None if self.mcap: self.ReleaseMouse() </code></pre> <p>Driver:</p> <pre><code>if __name__=="__main__": app=wx.App() window=wx.Frame(None,wx.ID_ANY) frame=SemNetWidget(None,window) # None:=No editor object c1=ConceptNode("Concept1",frame) c2=ConceptNode("Concept2",frame) window.Show() app.MainLoop() </code></pre>
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      1. POTrying to make draggable children of a scrolledwindow in wXPython
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    1. COUpdated the event handling to use mouse capture and drag delta movement (remember initial click point and object initial position on MouseDown). However, it still doesn't work quite right. It seems to be moving much more slowly than the mouse pointer...
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      1. POTrying to make draggable children of a scrolledwindow in wXPython
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