33b7017158
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27844 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
204 lines
7.0 KiB
Python
204 lines
7.0 KiB
Python
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import wx
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import wx.xrc as xrc
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#----------------------------------------------------------------------
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resourceText = r'''<?xml version="1.0"?>
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<resource>
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<!-- Notice that the class is NOT a standard wx class -->
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<object class="MyCustomPanel" name="MyPanel">
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<size>200,100</size>
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<object class="wxStaticText" name="label1">
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<label>This panel is a custom class derived from wx.Panel,\nand is loaded by a custom XmlResourceHandler.</label>
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<pos>10,10</pos>
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</object>
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</object>
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</resource>
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'''
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#----------------------------------------------------------------------
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class MyCustomPanel(wx.Panel):
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def __init__(self, parent, id, pos, size, style, name):
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wx.Panel.__init__(self, parent, id, pos, size, style, name)
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# This is the little bit of customization that we do for this
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# silly example.
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self.Bind(wx.EVT_SIZE, self.OnSize)
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t = wx.StaticText(self, -1, "MyCustomPanel")
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f = t.GetFont()
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f.SetWeight(wx.BOLD)
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f.SetPointSize(f.GetPointSize()+2)
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t.SetFont(f)
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self.t = t
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def OnSize(self, evt):
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sz = self.GetSize()
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w, h = self.t.GetTextExtent(self.t.GetLabel())
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self.t.SetPosition(((sz.width-w)/2, (sz.height-h)/2))
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# To do it the more complex way, (see below) we need to write the
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# class a little differently... This could obviously be done with a
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# single class, but I wanted to make separate ones to make clear what
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# the different requirements are.
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class PreMyCustomPanel(wx.Panel):
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def __init__(self):
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p = wx.PrePanel()
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self.PostCreate(p)
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def Create(self, parent, id, pos, size, style, name):
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wx.Panel.Create(self, parent, id, pos, size, style, name)
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self.Bind(wx.EVT_SIZE, self.OnSize)
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t = wx.StaticText(self, -1, "MyCustomPanel")
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f = t.GetFont()
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f.SetWeight(wx.BOLD)
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f.SetPointSize(f.GetPointSize()+2)
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t.SetFont(f)
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self.t = t
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def OnSize(self, evt):
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sz = self.GetSize()
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w, h = self.t.GetTextExtent(self.t.GetLabel())
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self.t.SetPosition(((sz.width-w)/2, (sz.height-h)/2))
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#----------------------------------------------------------------------
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class MyCustomPanelXmlHandler(xrc.XmlResourceHandler):
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def __init__(self):
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xrc.XmlResourceHandler.__init__(self)
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# Specify the styles recognized by objects of this type
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self.AddStyle("wxNO_3D", wx.NO_3D);
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self.AddStyle("wxTAB_TRAVERSAL", wx.TAB_TRAVERSAL);
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self.AddStyle("wxWS_EX_VALIDATE_RECURSIVELY", wx.WS_EX_VALIDATE_RECURSIVELY);
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self.AddStyle("wxCLIP_CHILDREN", wx.CLIP_CHILDREN);
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self.AddWindowStyles();
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# This method and the next one are required for XmlResourceHandlers
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def CanHandle(self, node):
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return self.IsOfClass(node, "MyCustomPanel")
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def DoCreateResource(self):
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# NOTE: wxWindows can be created in either a single-phase or
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# in a two-phase way. Single phase is what you normally do,
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# and two-phase creates the instnace first, and then later
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# creates the actual window when the Create method is called.
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# (In wxPython the first phase is done using the wxPre*
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# function, for example, wxPreFrame, wxPrePanel, etc.)
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#
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# wxXmlResource supports either method, a premade instance can
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# be created and populated by xrc using the appropriate
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# LoadOn* method (such as LoadOnPanel) or xrc can create the
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# instance too, using the Load* method. However this makes
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# the handlers a bit more complex. If you can be sure that a
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# particular class will never be loaded using a pre-existing
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# instance, then you can make the handle much simpler. I'll
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# show both methods below.
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if 1:
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# The simple method assumes that there is no existing
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# instance. Be sure of that with an assert.
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assert self.GetInstance() is None
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# Now create the object
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panel = MyCustomPanel(self.GetParentAsWindow(),
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self.GetID(),
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self.GetPosition(),
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self.GetSize(),
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self.GetStyle("style", wx.TAB_TRAVERSAL),
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self.GetName()
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)
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else:
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# When using the more complex (but more flexible) method
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# the instance may already have been created, check for it
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panel = self.GetInstance()
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if panel is None:
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# if not, then create the instance (but not the window)
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panel = PreMyCustomPanel()
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# Now call the panel's Create method to actually create the window
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panel.Create(self.GetParentAsWindow(),
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self.GetID(),
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self.GetPosition(),
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self.GetSize(),
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self.GetStyle("style", wx.TAB_TRAVERSAL),
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self.GetName()
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)
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# These two things should be done in either case:
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# Set standard window attributes
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self.SetupWindow(panel)
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# Create any child windows of this node
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self.CreateChildren(panel)
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return panel
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#----------------------------------------------------------------------
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class TestPanel(wx.Panel):
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def __init__(self, parent, log):
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self.log = log
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wx.Panel.__init__(self, parent, -1)
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# make the components
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label = wx.StaticText(self, -1, "The lower panel was built from this XML:")
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label.SetFont(wx.Font(12, wx.SWISS, wx.NORMAL, wx.BOLD))
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text = wx.TextCtrl(self, -1, resourceText,
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style=wx.TE_READONLY|wx.TE_MULTILINE)
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text.SetInsertionPoint(0)
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line = wx.StaticLine(self, -1)
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# Load the resource
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res = xrc.EmptyXmlResource()
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res.InsertHandler(MyCustomPanelXmlHandler())
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res.LoadFromString(resourceText)
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# Now create a panel from the resource data
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panel = res.LoadObject(self, "MyPanel", "MyCustomPanel")
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# and do the layout
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sizer = wx.BoxSizer(wx.VERTICAL)
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sizer.Add(label, 0, wx.EXPAND|wx.TOP|wx.LEFT, 5)
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sizer.Add(text, 1, wx.EXPAND|wx.ALL, 5)
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sizer.Add(line, 0, wx.EXPAND)
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sizer.Add(panel, 1, wx.EXPAND|wx.ALL, 5)
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self.SetSizer(sizer)
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self.SetAutoLayout(True)
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#----------------------------------------------------------------------
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def runTest(frame, nb, log):
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win = TestPanel(nb, log)
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return win
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#----------------------------------------------------------------------
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overview = """<html><body>
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<h2><center>wx.XmlResourceHandler</center></h2>
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Deriving a class from wx.XmlResourceHandler allows you to specify your
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own classes in XRC resources, and your handler class will then be used
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to create instances of that class when the resource is loaded.
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</body></html>
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"""
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if __name__ == '__main__':
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import sys,os
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import run
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run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
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