org.eclipse.jface.viewers.TreeViewer#getContentProvider ( )源码实例Demo

/**
 * Gathers the checked states of the given widget and its descendants, following a pre-order
 * traversal of the {@link ITreeContentProvider}.
 *
 * @param treeViewer to be traversed
 * @return
 */
protected static List<RosterEntryElement> collectAllRosterEntryElement(TreeViewer treeViewer) {
  ITreeContentProvider treeContentProvider =
      (ITreeContentProvider) treeViewer.getContentProvider();

  List<Object> collectedObjects = new ArrayList<Object>();

  Object[] objects = treeContentProvider.getElements(treeViewer.getInput());

  for (Object object : objects) {
    collectedObjects.add(object);
    collectAllRosterEntryElement(collectedObjects, treeViewer, object);
  }

  return ArrayUtils.getInstances(collectedObjects.toArray(), RosterEntryElement.class);
}
 

protected void configureTreeViewer(TreeViewer viewer) {
	viewer.setUseHashlookup(true);
	TypeScriptSearchLabelProvider innerLabelProvider= new TypeScriptSearchLabelProvider(this, TypeScriptSearchLabelProvider.SHOW_LABEL);
	viewer.setLabelProvider(new DecoratingTypeScriptSearchLabelProvider(innerLabelProvider));
	viewer.setContentProvider(new TypeScriptSearchTreeContentProvider(this, viewer));
	viewer.setComparator(new DecoratorIgnoringViewerSorter(innerLabelProvider));
	fContentProvider= (ITypeScriptSearchContentProvider) viewer.getContentProvider();
	addDragAdapters(viewer);
}
 

private void doNewButtonPressed() {
	Object newElement= fCreateTargetQuery.getCreatedTarget(fDestination);
	if (newElement != null) {
		TreeViewer viewer= getTreeViewer();
		ITreeContentProvider contentProvider= (ITreeContentProvider) viewer.getContentProvider();
		viewer.refresh(contentProvider.getParent(newElement));
		viewer.setSelection(new StructuredSelection(newElement), true);
		viewer.getTree().setFocus();
	}
}
 

protected void toggleHierarchy() {
	TreeViewer treeViewer= getTreeViewer();

	treeViewer.getTree().setRedraw(false);

	Object[] expandedElements= treeViewer.getExpandedElements();
	TypeHierarchyContentProvider contentProvider= (TypeHierarchyContentProvider) treeViewer.getContentProvider();
	treeViewer.setContentProvider(fOtherContentProvider);

	treeViewer.refresh();
	if (fOtherExpandedElements != null) {
		treeViewer.setExpandedElements(fOtherExpandedElements);
	} else {
		treeViewer.expandAll();
	}

	// reveal selection
	Object selectedElement= getSelectedElement();
	if (selectedElement != null)
		getTreeViewer().reveal(selectedElement);
	else
		selectFirstMatch();

	treeViewer.getTree().setRedraw(true);

	fOtherContentProvider= contentProvider;
	fOtherExpandedElements= expandedElements;

	updateStatusFieldText();
}
 

@Override
protected void configureTreeViewer(TreeViewer viewer) {
    viewer.setUseHashlookup(true);
    SearchIndexLabelProvider innerLabelProvider = createSearchIndexLabelProvider();
    viewer.setLabelProvider(new DecoratingFileSearchLabelProvider(innerLabelProvider));
    viewer.setContentProvider(createTreeContentProvider(viewer));
    viewer.setComparator(new DecoratorIgnoringViewerSorter(innerLabelProvider));
    fContentProvider = (ISearchIndexContentProvider) viewer.getContentProvider();
    addDragAdapters(viewer);

    updateGroupWith(viewer);
}
 

@Override
protected void configureTreeViewer(TreeViewer viewer) {
    viewer.setUseHashlookup(true);
    FileLabelProvider innerLabelProvider = new FileLabelProvider(this, FileLabelProvider.SHOW_LABEL);
    viewer.setLabelProvider(innerLabelProvider);
    viewer.setContentProvider(new FileTreeContentProvider(this, viewer));
    viewer.setComparator(new DecoratorIgnoringViewerSorter(innerLabelProvider));
    fContentProvider = (IFileSearchContentProvider) viewer.getContentProvider();
    addDragAdapters(viewer);
}
 

/**
 * Gathers the checked states of the given widget and its descendants, following a pre-order
 * traversal of the {@link ITreeContentProvider}.
 *
 * @param collectedObjects a writable list of elements (element type: <code>Object</code> )
 * @param treeViewer to be traversed
 * @param parentElement of which to determine the child nodes
 */
protected static void collectAllRosterEntryElement(
    List<Object> collectedObjects, TreeViewer treeViewer, Object parentElement) {

  ITreeContentProvider treeContentProvider =
      (ITreeContentProvider) treeViewer.getContentProvider();

  Object[] objects = treeContentProvider.getChildren(parentElement);

  for (Object object : objects) {
    collectedObjects.add(object);
    collectAllRosterEntryElement(collectedObjects, treeViewer, object);
  }
}
 

private void createTree(Composite parent) {

		Label label= new Label(parent, SWT.NONE);
		label.setLayoutData(new GridData(SWT.LEAD, SWT.CENTER, false, false));
		label.setText(WorkingSetMessages.JavaWorkingSetPage_workspace_content);

		fTree= new TreeViewer(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.MULTI);
		fTree.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		fTree.addFilter(new AddedElementsFilter());
		fTree.setUseHashlookup(true);

		configureTree(fTree);

		fTreeContentProvider= (ITreeContentProvider) fTree.getContentProvider();
	}
 

public void testPyCodeCoverageView() throws Exception {

        final PyCodeCoverageView view = PyCodeCoverageView.getView(true);
        //At this point it should have no folder selected and the option to run things in coverage should be
        //set to false.
        assertTrue(!PyCoveragePreferences.getAllRunsDoCoverage());
        assertTrue(PyCodeCoverageView.getChosenDir() == null);

        assertTrue(!view.allRunsGoThroughCoverage.getSelection());
        assertTrue(!PyCoveragePreferences.getInternalAllRunsDoCoverage());
        view.allRunsGoThroughCoverage.setSelection(true);
        view.allRunsGoThroughCoverage.notifyListeners(SWT.Selection, new Event());

        assertTrue(PyCoveragePreferences.getInternalAllRunsDoCoverage());
        assertTrue(!PyCoveragePreferences.getAllRunsDoCoverage());

        view.setSelectedContainer(sourceFolder);
        TreeViewer treeViewer = view.getTreeViewer();
        ITreeContentProvider cp = (ITreeContentProvider) treeViewer.getContentProvider();
        Object[] elements = cp.getElements(treeViewer.getInput());
        assertEquals(1, elements.length);
        ILabelProvider labelProvider = (ILabelProvider) treeViewer.getLabelProvider();
        assertEquals("pack_cov", labelProvider.getText(elements[0]));

        TestCaseUtils.assertContentsEqual(getInitialCoverageText(), view.getCoverageText());

        Object[] expandedElements = treeViewer.getExpandedElements();
        assertEquals(0, expandedElements.length);
        treeViewer.expandAll();
        expandedElements = treeViewer.getExpandedElements();
        assertEquals(1, expandedElements.length);

        view.executeRefreshAction(new NullProgressMonitor());
        expandedElements = treeViewer.getExpandedElements();
        assertEquals(1, expandedElements.length);

        assertTrue(PyCoveragePreferences.getAllRunsDoCoverage());

        final IWorkbench workBench = PydevPlugin.getDefault().getWorkbench();
        Display display = workBench.getDisplay();

        // Make sure to run the UI thread.
        final PyEdit modCovEditor = (PyEdit) PyOpenEditor.doOpenEditor(modCov);
        try {
            display.syncExec(new Runnable() {
                @Override
                public void run() {
                    LaunchShortcut launchShortcut = new LaunchShortcut();
                    launchShortcut.launch(modCovEditor, "run");
                }
            });

            final String modCovCoverageText = StringUtils.replaceNewLines(getModCovCoverageText(), "\n");
            //Should be enough time for the refresh to happen!
            goToManual(10000, new ICallback<Boolean, Object>() {

                @Override
                public Boolean call(Object arg) {
                    return modCovCoverageText.equals(StringUtils.replaceNewLines(view.getCoverageText(), "\n"));
                }
            });

            TestCaseUtils.assertContentsEqual(modCovCoverageText, view.getCoverageText());

            //goToManual();
        } finally {
            try {
                modCovEditor.close(false);
            } catch (Exception e) {
                //ignore anything here
            }
        }

    }
 

/**
 * Returns the number of items.
 *
 * @param tree
 * @return
 */
private int getItemCount(TreeViewer tree) {
    ITreeContentProvider provider = (ITreeContentProvider)tree.getContentProvider();
    return provider.getElements(null).length;
}