Typical - I just hit send and then I realise I can create my own Graphics 2D sub-class and just delegate to a Graphics2D created elsewhere, or to a SWT graphics context. I'll have a play with this later, but any ideas about the instantiation problem?
Thanks, Chris 2009/11/15 Christopher Brind <[email protected]> > Hi, > > I don't want to get people too excited, but I'm working on an Eclipse > plugin for Pivot. At the moment it simply recognises WTKX as an XML format, > and I've extended the XML editor to add a new page called 'Preview'. > > My original plan was use the SWT AWT bridge and some very simple code to > render the WTKX. That is, I don't render the the contents of the WTKX using > Pivot code, I simply call paint(Graphics2D) directly. > > However, I've hit a couple of problems: > > 1) SWT AWT Bridge doesn't work on Mac! > > The problem is also described here, ignoring the fact that the original > poster isn't actually using the SWT/AWT bridge - he has come across the same > problem as me, that something in Eclipse basically breaks AWT. In his case > he can run it on the command line, but when it comes to using the SWT/AWT > bridge, this has fail written all over it. > > I'm looking in to this in more detail, but I wonder if it would be worth > abstracting the graphics context so that it isn't AWT specific? Perhaps a > lot of work, but it would mean I could implement a pure SWT version for > rendering in Eclipse. > > > > 2) Instantiation problems when deserialising the WTKX > > Here's my rendering code, but in a stand alone way outside of Eclipse (I > got here by trying to debug the SWT/AWT problem) : > > public static void main(String[] args) throws Exception { > > > // Frame frame = new Frame(); > > Properties props = System.getProperties(); > > Iterator iter = props.keySet().iterator(); > > while (iter.hasNext()) { > > String key = (String) iter.next(); > > System.out.println(key + " : " + props.getProperty(key)); > > } > > > JFrame frame = new JFrame(); > > frame.setSize(800, 600); > > frame.setVisible(true); > > > JApplet applet = new JApplet(); > > applet.setSize(800, 600); > > frame.add(applet); > > frame.setVisible(true); > > > WTKXSerializer wtkx = new WTKXSerializer(); > > Object o = wtkx.readObject(new FileInputStream("assets/template.wtkx")); > > > Window window = null; > > if (o instanceof Window) { > > window = (Window) o; > > } else { > > window = new Window(); > > > Component c = (Component) o; > > c.setSize(applet.getWidth(), applet.getHeight()); > > > window.add(c); > > } > > > window.setSize(applet.getWidth(), applet.getHeight()); > > window.validate(); > > > Graphics2D g2d = (Graphics2D) applet.getGraphics(); > > window.paint(g2d); > > > } > > Similar code will be used inside the Eclipse plugin to render the WTKX in > the Eclipse editor - as you can see, it's a render-only process, it doesn't > handle events or anything like that. > > Now this actually works OK for the given WTKX: > > <BoxPane xmlns="org.apache.pivot.wtk" > > xmlns:wtkx="http://pivot.apache.org/wtkx";> > > <Label wtkx:id="label" text="Enter your name: "/> > > <TextInput preferredWidth="200" /> > > > > </BoxPane> > > But, if I drop in a Button, like this: > > <BoxPane xmlns="org.apache.pivot.wtk" > > xmlns:wtkx="http://pivot.apache.org/wtkx";> > > <Label wtkx:id="label" text="Enter your name: "/> > > <TextInput preferredWidth="200" /> > > <Button label="Submit" /> > > > > </BoxPane> > > I get some exceptions: > > An error occurred while processing element <BoxPane> starting at line > number 6: > org.apache.pivot.serialization.SerializationException: > java.lang.InstantiationException > at > org.apache.pivot.wtkx.WTKXSerializer.processStartElement(WTKXSerializer.java:585) > at > org.apache.pivot.wtkx.WTKXSerializer.readObject(WTKXSerializer.java:426) > at > org.apache.pivot.wtkxeditor.editors.WTKXPreviewer.main(WTKXPreviewer.java:37) > Caused by: java.lang.InstantiationException > at > sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30) > at java.lang.reflect.Constructor.newInstance(Constructor.java:513) > at java.lang.Class.newInstance0(Class.java:355) > at java.lang.Class.newInstance(Class.java:308) > at > org.apache.pivot.wtkx.WTKXSerializer.processStartElement(WTKXSerializer.java:583) > ... 2 more > Exception in thread "main" > org.apache.pivot.serialization.SerializationException: > java.lang.InstantiationException > at > org.apache.pivot.wtkx.WTKXSerializer.processStartElement(WTKXSerializer.java:585) > at org.apache.pivot.wtkx.WTKXSerializer.readObject(WTKXSerializer.java:426) > at > org.apache.pivot.wtkxeditor.editors.WTKXPreviewer.main(WTKXPreviewer.java:37) > Caused by: java.lang.InstantiationException > at > sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30) > at java.lang.reflect.Constructor.newInstance(Constructor.java:513) > at java.lang.Class.newInstance0(Class.java:355) > at java.lang.Class.newInstance(Class.java:308) > at > org.apache.pivot.wtkx.WTKXSerializer.processStartElement(WTKXSerializer.java:583) > ... 2 more > > > I realise my circumventing the usual Pivot lifecycle might have something > to do with it, so any ideas? > > If I can get around problem #2 somehow I think I can still produce an alpha > version Eclipse plugin that will work on Windows/Linux, just not Mac =( but > like I say - being able to implement a pure SWT graphics context would get > around that problem. > > Cheers, > Chris > > > >
