Java 类org.eclipse.jface.viewers.ITreePathContentProvider 实例源码

private boolean hasUnfilteredChild(TreeViewer viewer, TreePath parentPath, Object element) {
    TreePath elementPath = parentPath.createChildPath(element);
    IContentProvider contentProvider = viewer.getContentProvider();
    Object[] children = contentProvider instanceof ITreePathContentProvider
            ? ((ITreePathContentProvider) contentProvider).getChildren(elementPath)
            : ((ITreeContentProvider) contentProvider).getChildren(element);

    /* avoid NPE + guard close */
    if (children == null || children.length == 0) {
        return false;
    }
    for (int i = 0; i < children.length; i++) {
        if (selectTreePath(viewer, elementPath, children[i])) {
            return true;
        }
    }
    return false;
}

private boolean hasUnfilteredChild(TreeViewer viewer, TreePath parentPath, Object element) {
    TreePath elementPath = parentPath.createChildPath(element);
    IContentProvider contentProvider = viewer.getContentProvider();
    Object[] children = contentProvider instanceof ITreePathContentProvider
            ? ((ITreePathContentProvider) contentProvider).getChildren(elementPath)
            : ((ITreeContentProvider) contentProvider).getChildren(element);

    /* avoid NPE + guard close */
    if (children == null || children.length == 0) {
        return false;
    }
    for (int i = 0; i < children.length; i++) {
        if (selectTreePath(viewer, elementPath, children[i])) {
            return true;
        }
    }
    return false;
}

private boolean hasUnfilteredChild(TreeViewer viewer, TreePath parentPath, Object element) {
    TreePath elementPath = parentPath.createChildPath(element);
    IContentProvider contentProvider = viewer.getContentProvider();
    Object[] children = contentProvider instanceof ITreePathContentProvider
            ? ((ITreePathContentProvider) contentProvider).getChildren(elementPath)
            : ((ITreeContentProvider) contentProvider).getChildren(element);

    /* avoid NPE + guard close */
    if (children == null || children.length == 0) {
        return false;
    }

    for (int i = 0; i < children.length; i++) {
        if (selectTreePath(viewer, elementPath, children[i])) {
            return true;
        }
    }
    return false;
}

/**
 * <p>
 * Gallery expects contents to have exactly 2 levels of hierarchy, with groups as the root elements and image
 * thumbnails as direct children of the groups. This method accepts ITreeContentProvider and ITreePathContentProvider
 * as-is, and relies on the providers to return contents with the correct structure.
 * </p>
 * <p>
 * This method also accepts IStructuredContentProvider and wraps it in a FlatTreeContentProvider with an empty string
 * as the root node. If you need a different root node, construct your own FlatTreeContentProvider and pass it here.
 * If you want the Gallery to suppress the collapsable group header, call
 * </p>
 * <code>getGallery().setGroupRenderer(new NoGroupRenderer());</code>
 */
public void setContentProvider(IContentProvider provider) {
    if (provider instanceof IStructuredContentProvider
            && !(provider instanceof ITreeContentProvider || provider instanceof ITreePathContentProvider)) {
        // Wrap a table-style contents with a single root node.
        super.setContentProvider(new FlatTreeContentProvider((IStructuredContentProvider) provider));
    } else {
        super.setContentProvider(provider);
    }
}