Bonjour,

J'ai recréé le problème dans un snippet. Vous pourrez constater le soucis.
Si on sélectionne un élément d'un sous dossier, puis que l'on s'amuse a cocher/décocher le bouton "Afficher les fichiers", la sélection change de place.

Est-ce normal ?

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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package test;
 
import java.io.File;
 
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
 
public class TestTreeWithFilter {
	static boolean	  showFile	   = false;
	static TreeViewer	treeViewer	= null;
 
	static void checkPath(final TreeItem item, boolean checked, boolean grayed) {
		if (item == null) {
			return;
		}
		if (grayed) {
			checked = true;
		} else {
			int index = 0;
			TreeItem[] items = item.getItems();
			while (index < items.length) {
				TreeItem child = items[index];
				if (child.getGrayed() || (checked != child.getChecked())) {
					checked = grayed = true;
					break;
				}
				index++;
			}
		}
		item.setChecked(checked);
		item.setGrayed(grayed);
		checkPath(item.getParentItem(), checked, grayed);
	}
 
	static void checkItems(final TreeItem item, final boolean checked) {
		item.setGrayed(false);
		item.setChecked(checked);
		TreeItem[] items = item.getItems();
		for (TreeItem item2 : items) {
			checkItems(item2, checked);
		}
	}
 
	public static void main(final String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
 
		Composite composite = new Composite(shell, SWT.None);
		composite.setLayout(new GridLayout(1, false));
 
		treeViewer = new TreeViewer(composite, SWT.BORDER | SWT.CHECK);
 
		treeViewer.setContentProvider(new ITreeContentProvider() {
 
			@Override
			public void inputChanged(final Viewer viewer, final Object oldInput, final Object newInput) {
			}
 
			@Override
			public void dispose() {
			}
 
			@Override
			public Object[] getElements(final Object inputElement) {
				return ((File) inputElement).listFiles();
			}
 
			@Override
			public boolean hasChildren(final Object element) {
				if (element != null) {
					File file = (File) element;
					File[] fileChildren = file.listFiles();
					if (fileChildren != null) {
						return fileChildren.length != 0;
					}
				}
				return false;
			}
 
			@Override
			public Object getParent(final Object element) {
				return null;
			}
 
			@Override
			public Object[] getChildren(final Object parentElement) {
				if (parentElement != null) {
					File file = (File) parentElement;
					return file.listFiles();
				}
				return null;
			}
		});
 
		treeViewer.setLabelProvider(new LabelProvider() {
			@Override
			public String getText(final Object element) {
				File file = (File) element;
				return file.getName();
			}
		});
 
		treeViewer.setFilters(new ViewerFilter[] { new ViewerFilter() {
			@Override
			public boolean select(final Viewer viewer, final Object parentElement, final Object element) {
				if (element != null) {
					File file = (File) element;
					return ((showFile && file.isFile()) || file.isDirectory());
				}
				return false;
			}
		} });
 
		Tree tree = treeViewer.getTree();
		tree.addListener(SWT.Selection, new Listener() {
			public void handleEvent(final Event event) {
				if (event.detail == SWT.CHECK) {
					TreeItem item = (TreeItem) event.item;
					boolean checked = item.getChecked();
					checkItems(item, checked);
					checkPath(item.getParentItem(), checked, false);
				}
			}
		});
		tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
 
		Button filtrer = new Button(composite, SWT.CHECK);
		filtrer.setText("Afficher les fichiers");
		filtrer.addSelectionListener(new SelectionListener() {
 
			@Override
			public void widgetSelected(final SelectionEvent e) {
				showFile = ((Button) e.getSource()).getSelection();
				treeViewer.refresh();
			}
 
			@Override
			public void widgetDefaultSelected(final SelectionEvent e) {
			}
		});
		filtrer.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false, 1, 1));
 
		treeViewer.setInput(new File("C:\\"));
 
		tree.setSize(200, 200);
		shell.pack();
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}
}
Merci d'avance.