[news.eclipse.platform] Re: custom content provider not automatically ac

[Qinxian <fyaoxy@xxxxxxxxx>]

Hi,

The content provider must be set before that viewer call setInput method.
Is this?


Cheers,
Xiangya
Andreas Pakulat åé:
> Hi,
>
> I've got a relatively simple custom content provider for a CommonNavigator
> view. The provider itself seems to work quite fine, but I can't seem to
> find out why it displays the content only after I've disabled and
> re-enabled the content provider under the Customize View dialog. After the
> re-enabling I see the two nodes, but not when initially showing the view.
>
> Any ideas?
>
> Andreas
>
> The content provider code is as follows and its just bound to a plain
> CommonNavigator view.
>
> import org.eclipse.core.resources.IFile;
> import org.eclipse.core.resources.IFolder;
> import org.eclipse.core.resources.IProject;
> import org.eclipse.core.resources.IResource;
> import org.eclipse.core.resources.IResourceChangeEvent;
> import org.eclipse.core.resources.IResourceChangeListener;
> import org.eclipse.core.resources.IResourceDelta;
> import org.eclipse.core.resources.IResourceDeltaVisitor;
> import org.eclipse.core.resources.ResourcesPlugin;
> import org.eclipse.core.runtime.CoreException;
> import org.eclipse.core.runtime.IProgressMonitor;
> import org.eclipse.core.runtime.IStatus;
> import org.eclipse.core.runtime.Status;
> import org.eclipse.jface.viewers.ITreeContentProvider;
> import org.eclipse.jface.viewers.StructuredViewer;
> import org.eclipse.jface.viewers.Viewer;
> import org.eclipse.ui.progress.UIJob;
>
> public class MyTreeContentProvider implements ITreeContentProvider,
>         IResourceChangeListener, IResourceDeltaVisitor
> {
>
>     private String root;
>     private String[] childs = { "foo", "bar" };
>     
>     private StructuredViewer viewer;
>
>     public MyTreeContentProvider()
>     {
>         System.err.println("content tree provider");
>         System.out.println( "Using squish content provider" );
>         ResourcesPlugin.getWorkspace().addResourceChangeListener( this,
>                 IResourceChangeEvent.POST_CHANGE );
>     }
>
>     @Override
>     public Object[] getChildren( Object parentElement )
>     {
>         // TODO Auto-generated method stub
>         System.err.println( "TreeProvider.getChildren:" +
> parentElement+"|"+parentElement.getClass() );
>         if ( parentElement instanceof String ) {
>             return new String[0];
>         } else {
>             return childs;
>         }
>     }
>
>     @Override
>     public Object getParent( Object element )
>     {
>         // TODO Auto-generated method stub
>         if( element.equals( childs[0] ) || element.equals( childs[1] ) )
>             return root;
>         System.err.println( "TreeProvider.getParent" + element
> +"|"+element.getClass() );
>         return null;
>     }
>
>     @Override
>     public boolean hasChildren( Object element )
>     {
>         // TODO Auto-generated method stub
>         System.err.println( "TreeProvider.hasChildren:"+element+"|"+
>                 element.getClass() );
>         return getChildren( element ).length > 0;
>     }
>
>     @Override
>     public Object[] getElements( Object inputElement )
>     {
>         // TODO Auto-generated method stub
>         System.err.println( "TreeProvider.getElements:" +
> inputElement+"|"+inputElement.getClass() );
>         return getChildren( inputElement );
>     }
>
>     @Override
>     public void dispose()
>     {
>         System.err.println( "TreeProvider.dispose" );
>         ResourcesPlugin.getWorkspace().removeResourceChangeListener( this );
>         // TODO Auto-generated method stub
>
>     }
>
>     @Override
>     public void inputChanged( Viewer aviewer, Object oldInput, Object
> newInput )
>     {
>         System.err.println( "TreeProvider.inputChanged" );
>         viewer = (StructuredViewer)aviewer;
>         // TODO Auto-generated method stub
>
>     }
>
>     /*
>      * (non-Javadoc)
>      * 
>      */
>     public void resourceChanged( IResourceChangeEvent event )
>     {
>         System.out.println("TreeProvider.resourceChagned");
>         IResourceDelta delta = event.getDelta();
>         try {
>             delta.accept( this );
>         } catch ( CoreException e ) {
>             e.printStackTrace();
>         }
>     }
>
>     /*
>      * (non-Javadoc)
>      * 
>      */
>     public boolean visit( IResourceDelta delta )
>     {
>         IResource source = delta.getResource();
>         System.out.println("TreeProvider.visit:"+source.getType() );
>         switch ( source.getType() ) {
>             case IResource.FOLDER:
>                 System.err.println("folder change");
>                 final IFolder f = (IFolder)source;
>                 System.err.println("updating view");
>                 new UIJob("Update Properties Model in CommonViewer") {
>                     public IStatus runInUIThread(IProgressMonitor monitor) {
>                         if (viewer != null
> && !viewer.getControl().isDisposed()) {
>                             System.err.println("refreshing viewer for
> project");
>                             viewer.refresh(f);
>                         }
>                         return Status.OK_STATUS;
>                     }
>                 }.schedule();
>                 
>             case IResource.ROOT:
>                 System.err.println("root change:");
>                 final IResource root = (IResource)source;
>                 System.err.println("updating view");
>                 new UIJob("Update Properties Model in CommonViewer") {
>                     public IStatus runInUIThread(IProgressMonitor monitor) {
>                         if (viewer != null
> && !viewer.getControl().isDisposed()) {
>                             System.err.println("refreshing viewer for
> project");
>                             viewer.refresh(root);
>                         }
>                         return Status.OK_STATUS;
>                     }
>                 }.schedule();
>                 
>             case IResource.PROJECT:
>                 System.err.println("project change");
>                 final IProject project = (IProject)source;
>                 System.err.println("updating view");
>                 new UIJob("Update Properties Model in CommonViewer") {
>                     public IStatus runInUIThread(IProgressMonitor monitor) {
>                         if (viewer != null
> && !viewer.getControl().isDisposed()) {
>                             System.err.println("refreshing viewer for
> project");
>                             viewer.refresh(project);
>                         }
>                         return Status.OK_STATUS;
>                     }
>                 }.schedule();
>                 return false;
>             case IResource.FILE:
>                 System.err.println("got file");
>                  final IFile file = (IFile) source;
>                 // if (PROPERTIES_EXT.equals(file.getFileExtension())) {
>                 // updateModel(file);
>                  new UIJob("Update Properties Model in CommonViewer") {
>                      public IStatus runInUIThread(IProgressMonitor monitor)
> {
>                          if (viewer != null
> && !viewer.getControl().isDisposed()) {
>                              System.err.println("refreshing viewer for
> file");
>                              viewer.refresh(file);
>                          }
>                          return Status.OK_STATUS;
>                      }
>                  }.schedule();
>                 // }
>                 return false;
>             default:
>                 System.err.println("unknown change");
>         }
>         return true;
>     }
> }