Cannot add a FigureCanvas

[Feng Dihai]

We have created a customized component based on FigureCanvas, but failed to insert it via SWT designer.

Please help us to figure out the problem. Thank you.

Log is here:

!ENTRY com.swtdesigner 4 4 2006-08-14 16:53:00.536
!MESSAGE Designer internal error [5.0.0.2006.06.23]: Can not find constructor for org.eclipse.draw2d.FigureCanvas
!STACK 0
java.lang.IllegalArgumentException: Can not find constructor for org.eclipse.draw2d.FigureCanvas
at com.swtdesigner.model.swt.widgets.SWTBeanInfo.getNewControlCode(SWTBeanInfo.java:413)
at com.swtdesigner.model.JavaInfo.getNewControlBlockCode(JavaInfo.java:3411)
at com.swtdesigner.model.JavaInfo.addToParentBlockOrPlain(JavaInfo.java:3138)
at com.swtdesigner.model.JavaInfo.addToParent(JavaInfo.java:3104)
at com.swtdesigner.model.swing.JavaBeanInfo.addToParent(JavaBeanInfo.java:720)
at com.swtdesigner.model.swt.widgets.WidgetInfo.addToParent(WidgetInfo.java:93)
at com.swtdesigner.model.JavaInfo.addToParent(JavaInfo.java:3083)
at com.swtdesigner.model.swt.layout.grid.GridLayoutInfo.createCommand(GridLayoutInfo.java:1333)
at com.swtdesigner.gef.policy.swt.layout.grid.GridLayoutEditPolicy2$CreateCommand.execute(GridLayoutEditPolicy2.java:243)
at org.eclipse.gef.commands.CommandStack.execute(CommandStack.java:78)
at com.swtdesigner.gef.domain.DesignerEditDomain$1.execute(DesignerEditDomain.java:57)
at org.eclipse.gef.tools.AbstractTool.executeCurrentCommand(AbstractTool.java:416)
at org.eclipse.gef.tools.CreationTool.performCreation(CreationTool.java:198)
at org.eclipse.gef.tools.CreationTool.handleButtonUp(CreationTool.java:122)
at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:1006)
at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:229)
at com.swtdesigner.gef.domain.DesignerEditDomain.mouseUp(DesignerEditDomain.java:265)
at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:346)
at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:511)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:137)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

[Eric Clayberg]

We have created a customized component based on FigureCanvas, but failed to insert it via SWT designer.
...
java.lang.IllegalArgumentException: Can not find constructor for org.eclipse.draw2d.FigureCanvas

Make sure that your widget has a public, two argument constructor (required in order to be a valid SWT widget).

The constructor argtuments should be a Composite and an int (e.g., parent and style).

[Feng Dihai]

Make sure that your widget has a public, two argument constructor (required in order to be a valid SWT widget).

The constructor argtuments should be a Composite and an int (e.g., parent and style).

Yes, we prepared a constructor like this:

Code: Select all

public MyFigureCanvas(Composite parent, int style)

The problem is we just cannot insert a org.eclipse.draw2d.FigureCanvas, which of course has a constructor like

Code: Select all

public FigureCanvas(Composite parent, int style)

[Eric Clayberg]

The problem is we just cannot insert a org.eclipse.draw2d.FigureCanvas, which of course has a constructor like

I'm not sure what you mean.

I would suggest that you send us an actual test case.

[Feng Dihai]

I'm not sure what you mean.

I would suggest that you send us an actual test case.

I prepared a test case project to show the problem, including a .log file and 2 screenshots for both design&run time under project root.

com.foo.swt.widget.GridFigureCanvas
The sample subclass of org.eclipse.draw2d.FigureCanvas, which drawing grids line on background of the widget

com.foo.SampleShell
The container shell holding a GridFigureCanvas which is inserted by WindowBuilderPro SWTDesigner. On desing time, errors occured while everything is ok on runtime.

Please check the archived project file, download it from here: FigureCanvasTestCase.zip

Thank you very much.

[Eric Clayberg]

Please check the archived project file

Give the latest v5.0.1 daily build a try. It will no longer throw an exception and you will be able to place your GridFigureCanvas widget in Designer.

Note that any widgets that you base off of FigureCanvas will not render correctly in the Designer Design view (they will be blank) because of the way that FigureCanvas manages its own GC. They will show up correcty when you test the window.

If you want your custom widgets to render within the Designer Design view, you should subclass Canvas instead.