Move more work from edt into background thread when updating directories.

core/src/main/java/com/github/weisj/darklaf/components/RotatableIconAnimator.java

@@ -27,6 +27,7 @@ import javax.swing.*;
 
 import com.github.weisj.darklaf.icons.RotatableIcon;
 import com.github.weisj.darklaf.util.Alignment;
+import com.github.weisj.darklaf.util.DarkUIUtil;
 
 public class RotatableIconAnimator extends Timer {
 
@@ -43,8 +44,6 @@ public class RotatableIconAnimator extends Timer {
         super(100, null);
         if (icon == null)
             throw new IllegalArgumentException("Icon is null");
-        if (parent == null)
-            throw new IllegalArgumentException("Component is null");
         addActionListener(this::onAction);
         setRepeats(true);
         this.icon = icon;
@@ -53,16 +52,26 @@ public class RotatableIconAnimator extends Timer {
     }
 
     public void resume() {
+        if (!isRunning())
             start();
     }
 
     public void onAction(final ActionEvent e) {
         icon.setRotation(Math.PI * 2 * (((double) frame) / frameCount));
-        parent.repaint();
+        repaint();
         frame = (frame + 1) % frameCount;
     }
 
+    protected void repaint() {
+        DarkUIUtil.repaint(getParent());
+    }
+
+    public JComponent getParent() {
+        return parent;
+    }
+
     public void suspend() {
+        if (isRunning())
             stop();
     }
 }

core/src/main/java/com/github/weisj/darklaf/components/filetree/FileTree.java

@@ -22,30 +22,38 @@
 package com.github.weisj.darklaf.components.filetree;
 
 import java.io.File;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
 
 import javax.swing.*;
 import javax.swing.filechooser.FileSystemView;
 import javax.swing.tree.TreeModel;
+import javax.swing.tree.TreePath;
+
 
 public class FileTree extends JTree {
 
     public FileTree() {
-        this(null);
+        this((File[]) null);
     }
 
-    public FileTree(final File rootFile) {
+    public FileTree(final File... rootFile) {
-        this(rootFile, false);
+        this(false, rootFile);
     }
 
-    public FileTree(final File rootFile, final boolean showHiddenFiles) {
+    public FileTree(final boolean showHiddenFiles, final File... rootFiles) {
         FileSystemView fileSystemView = FileSystemView.getFileSystemView();
-        setFileTreeModel(createModel(fileSystemView, rootFile, showHiddenFiles));
+        setFileTreeModel(createModel(fileSystemView, showHiddenFiles, rootFiles));
         setCellRenderer(new FileTreeCellRenderer(fileSystemView));
         setRootVisible(false);
     }
 
-    protected FileTreeModel createModel(final FileSystemView fsv, final File rootFile, final boolean showHiddenFiles) {
+    protected FileTreeModel createModel(final FileSystemView fsv, final boolean showHiddenFiles,
-        return new FileTreeModel(fsv, rootFile, showHiddenFiles);
+            final File... rootFiles) {
+        return new FileTreeModel(fsv, showHiddenFiles, rootFiles);
     }
 
     public boolean isShowHiddenFiles() {
@@ -71,4 +79,19 @@ public class FileTree extends JTree {
     public void reload() {
         getModel().reload();
     }
+
+    public Path getSelectedFile() {
+        TreePath path = getSelectionPath();
+        if (path == null)
+            return null;
+        return ((FileTreeNode) path.getLastPathComponent()).getFile();
+    }
+
+    public List<Path> getSelectedFiles() {
+        TreePath[] paths = getSelectionPaths();
+        if (paths == null)
+            return Collections.emptyList();
+        return Arrays.stream(getSelectionPaths()).map(TreePath::getLastPathComponent).map(FileTreeNode.class::cast)
+                .map(FileTreeNode::getFile).collect(Collectors.toList());
+    }
 }

core/src/main/java/com/github/weisj/darklaf/components/filetree/FileTreeCellRenderer.java

@@ -39,7 +39,8 @@ public class FileTreeCellRenderer extends DefaultTreeCellRenderer {
     @Override
     public Component getTreeCellRendererComponent(final JTree tree, final Object value, final boolean selected,
             final boolean expanded, final boolean leaf, final int row, final boolean hasFocus) {
-        Path f = ((FileTreeNode) value).getFile();
+        FileTreeNode node = ((FileTreeNode) value);
+        Path f = node.getFile();
         if (f != null) {
             setIcon(fsv.getSystemIcon(f.toFile()));
             setText(fsv.getSystemDisplayName(f.toFile()));

core/src/main/java/com/github/weisj/darklaf/components/filetree/FileTreeModel.java

@@ -23,6 +23,8 @@ package com.github.weisj.darklaf.components.filetree;
 
 import java.io.File;
 import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.Collections;
 
 import javax.swing.filechooser.FileSystemView;
 import javax.swing.tree.DefaultTreeModel;
@@ -33,28 +35,29 @@ public class FileTreeModel extends DefaultTreeModel {
     protected boolean showHiddenFiles;
 
     public FileTreeModel(final FileSystemView fileSystemView) {
-        this(fileSystemView, (Path) null, false);
+        this(fileSystemView, false, (Path[]) null);
     }
 
-    public FileTreeModel(final FileSystemView fileSystemView, final File root, final boolean showHiddenFiles) {
+    public FileTreeModel(final FileSystemView fileSystemView, final boolean showHiddenFiles, final File... roots) {
-        this(fileSystemView, root != null ? root.toPath() : null, showHiddenFiles);
+        this(fileSystemView, showHiddenFiles,
+                roots != null ? Arrays.stream(roots).map(File::toPath).toArray(Path[]::new) : null);
     }
 
-    public FileTreeModel(final FileSystemView fileSystemView, final Path root, final boolean showHiddenFiles) {
+    public FileTreeModel(final FileSystemView fileSystemView, final boolean showHiddenFiles, final Path... roots) {
         super(null);
         init();
         this.showHiddenFiles = showHiddenFiles;
         this.fsv = fileSystemView;
-        this.root = createRoot(root);
+        this.root = createRoot(roots);
     }
 
     protected void init() {}
 
-    protected FileTreeNode createRoot(final Path root) {
+    protected FileTreeNode createRoot(final Path... roots) {
-        if (root == null) {
+        if (roots == null || roots.length != 1) {
-            return new FileTreeNode.RootNode(this);
+            return new FileTreeNode.RootNode(this, roots == null ? Collections.emptyList() : Arrays.asList(roots));
         } else {
-            return createNode(null, root);
+            return createNode(null, roots[0]);
         }
     }
 

core/src/main/java/com/github/weisj/darklaf/components/filetree/FileTreeNode.java

@@ -24,9 +24,9 @@ package com.github.weisj.darklaf.components.filetree;
 import java.io.IOException;
 import java.nio.file.*;
 import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
-import java.util.function.Function;
 import java.util.stream.Stream;
 
 import javax.swing.*;
@@ -37,6 +37,7 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
     protected final FileTreeNode parent;
     protected final FileTreeModel model;
     protected final Path file;
+    protected AtomicInteger taskCount = new AtomicInteger();
     protected AtomicReference<List<FileTreeNode>> children;
     protected WatchKey watchKey;
 
@@ -75,18 +76,13 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
         return index;
     }
 
-    private void add(final List<FileTreeNode> nodes, final FileTreeNode node) {
+    private int remove(final List<FileTreeNode> nodes, final FileTreeNode node) {
-        int index = addSorted(nodes, node);
-        model.nodesWereInserted(FileTreeNode.this, new int[] {index});
-    }
-
-    private void remove(final List<FileTreeNode> nodes, final FileTreeNode node) {
         int index = nodes.indexOf(node);
-        if (index < 0)
+        if (index >= 0) {
-            return;
             nodes.remove(node);
             model.unregister(node);
-        model.nodesWereRemoved(FileTreeNode.this, new int[] {index}, new Object[] {node});
+        }
+        return index;
     }
 
     public void reload() {
@@ -99,30 +95,45 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
         if (children.get() == null)
             return;
         List<FileTreeNode> fileList = children.get();
-        doInBackground((Consumer<FileTreeNode> proc) -> {
+        this.<ReloadOp>doInBackground(pub -> {
-            traverseChildren(this::toNodes).accept(proc);
+            taskCount.getAndIncrement();
-            fileList.stream().filter(n -> Files.notExists(n.file)).forEach(proc);
+            this.traverseChildren(s -> {
-        }, chunks -> {
+                Stream.concat(s.map(this::toNode), fileList.stream()).map(n -> {
-            for (FileTreeNode node : chunks) {
+                    if (Files.notExists(n.file)) {
-                if (Files.notExists(node.file)) {
+                        return ReloadOp.remove(n, remove(fileList, n));
-                    remove(fileList, node);
                     } else {
                         if (model.showHiddenFiles) {
-                        if (!fileList.contains(node)) {
+                            if (!fileList.contains(n)) {
-                            add(fileList, node);
+                                return ReloadOp.add(n, addSorted(fileList, n));
                             }
                         } else {
-                        if (isHidden(node.file)) {
+                            if (isHidden(n.file)) {
-                            remove(fileList, node);
+                                return ReloadOp.remove(n, remove(fileList, n));
-                        } else if (!fileList.contains(node)) {
+                            } else if (!fileList.contains(n)) {
-                            add(fileList, node);
+                                return ReloadOp.add(n, addSorted(fileList, n));
                             }
                         }
                     }
+                    return null;
+                }).forEach(pub);
+            });
+        }, chunk -> {
+            for (ReloadOp op : chunk) {
+                if (op != null) {
+                    switch (op.type) {
+                        case ADD:
+                            model.nodesWereInserted(FileTreeNode.this, new int[] {op.index});
+                            break;
+                        case REMOVE:
+                            model.nodesWereRemoved(FileTreeNode.this, new int[] {op.index}, new Object[] {op.node});
+                            break;
+                    }
+                }
             }
         }, () -> {
             if (depth > 0)
                 fileList.forEach(n -> n.reload(depth - 1));
+            taskCount.getAndDecrement();
         });
     }
 
@@ -132,17 +143,13 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
                 return list;
             }
             List<FileTreeNode> fileList = Collections.synchronizedList(new ArrayList<>());
-            doInBackground(
+            this.<Integer>doInBackground(pub -> {
-                    traverseChildren(asNodes(stream -> stream.filter(p -> model.showHiddenFiles || !isHidden(p)))),
+                traverseChildren(s -> {
-                    chunks -> {
+                    s.filter(p -> model.showHiddenFiles || !isHidden(p)).map(this::toNode)
-                        Collections.sort(fileList);
+                            .map(n -> addSorted(fileList, n)).forEach(pub);
-                        int[] indices = new int[chunks.size()];
+                });
-                        int i = 0;
+            }, chunks -> {
-                        for (FileTreeNode node : chunks) {
+                model.nodesWereInserted(FileTreeNode.this, chunks.stream().mapToInt(Integer::intValue).toArray());
-                            indices[i] = addSorted(fileList, node);
-                            i++;
-                        }
-                        model.nodesWereInserted(FileTreeNode.this, indices);
             });
             return fileList;
         });
@@ -156,24 +163,17 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
         }
     }
 
-    private Function<Stream<Path>, Stream<FileTreeNode>> asNodes(
+    private FileTreeNode toNode(final Path path) {
-            final Function<Stream<Path>, Stream<Path>> transformer) {
+        return model.createNode(FileTreeNode.this, path);
-        return stream -> toNodes(transformer.apply(stream));
-    }
-
-    private Stream<FileTreeNode> toNodes(final Stream<Path> stream) {
-        return stream.map(p -> model.createNode(FileTreeNode.this, p));
     }
 
-    private <T> Consumer<Consumer<T>> traverseChildren(final Function<Stream<Path>, Stream<T>> transformer) {
+    private void traverseChildren(final Consumer<Stream<Path>> consumer) {
-        return publish -> {
         if (Files.isDirectory(file)) {
             try (Stream<Path> files = Files.walk(file, 1, FileVisitOption.FOLLOW_LINKS)) {
-                    transformer.apply(files.filter(p -> !file.equals(p)).filter(Files::isReadable)).forEach(publish);
+                consumer.accept(files.filter(p -> !file.equals(p)).filter(Files::isReadable));
             } catch (IOException ignored) {
             }
         }
-        };
     }
 
     private <T> void doInBackground(final Consumer<Consumer<T>> task, final Consumer<List<T>> processor) {
@@ -263,12 +263,19 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
         }
     }
 
+    public boolean isBusy() {
+        return taskCount.get() > 0;
+    }
+
     public static class RootNode extends FileTreeNode {
 
-        public RootNode(final FileTreeModel model) {
+        private final List<Path> roots;
+
+        public RootNode(final FileTreeModel model, final List<Path> roots) {
             super(null, null, model);
+            this.roots = roots;
             List<FileTreeNode> nodes = new ArrayList<>();
-            FileSystems.getDefault().getRootDirectories().forEach(p -> {
+            createInitialDirectories().forEach(p -> {
                 FileTreeNode node = model.createNode(RootNode.this, p);
                 model.register(node);
                 nodes.add(node);
@@ -276,12 +283,16 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
             children.set(nodes);
         }
 
+        protected Iterable<Path> createInitialDirectories() {
+            return roots.size() > 0 ? roots : FileSystems.getDefault().getRootDirectories();
+        }
+
         @Override
         protected void reload(final int depth) {
             if (depth < 0)
                 return;
             List<FileTreeNode> nodes = children.get();
-            FileSystems.getDefault().getRootDirectories().forEach(p -> {
+            createInitialDirectories().forEach(p -> {
                 FileTreeNode node = model.createNode(this, p);
                 if (!nodes.contains(node)) {
                     model.register(node);
@@ -310,4 +321,30 @@ public class FileTreeNode implements TreeNode, Comparable<FileTreeNode> {
             return true;
         }
     }
+
+    private static class ReloadOp {
+
+        private final Type type;
+        private final FileTreeNode node;
+        private final int index;
+
+        private ReloadOp(final Type type, final FileTreeNode node, final int index) {
+            this.type = type;
+            this.node = node;
+            this.index = index;
+        }
+
+        private static ReloadOp add(final FileTreeNode n, final int index) {
+            return new ReloadOp(Type.ADD, n, index);
+        }
+
+        private static ReloadOp remove(final FileTreeNode n, final int index) {
+            return new ReloadOp(Type.REMOVE, n, index);
+        }
+
+        private enum Type {
+            ADD, REMOVE
+        }
+
+    }
 }

core/src/main/java/com/github/weisj/darklaf/components/filetree/WatchFileTree.java

@@ -29,20 +29,21 @@ import javax.swing.filechooser.FileSystemView;
 public class WatchFileTree extends FileTree {
 
     public WatchFileTree() {
-        super(null);
+        super();
     }
 
-    public WatchFileTree(final File rootFile) {
+    public WatchFileTree(final File... rootFiles) {
-        super(rootFile, false);
+        super(rootFiles);
     }
 
-    public WatchFileTree(final File rootFile, final boolean showHiddenFiles) {
+    public WatchFileTree(final boolean showHiddenFiles, final File... rootFiles) {
-        super(rootFile, showHiddenFiles);
+        super(showHiddenFiles, rootFiles);
     }
 
     @Override
-    protected FileTreeModel createModel(final FileSystemView fsv, final File rootFile, final boolean showHiddenFiles) {
+    protected FileTreeModel createModel(final FileSystemView fsv, final boolean showHiddenFiles,
-        return new WatchFileTreeModel(fsv, rootFile, showHiddenFiles);
+            final File... rootFiles) {
+        return new WatchFileTreeModel(fsv, showHiddenFiles, rootFiles);
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/components/filetree/WatchFileTreeModel.java

@@ -24,10 +24,7 @@ package com.github.weisj.darklaf.components.filetree;
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.*;
-import java.util.Collections;
+import java.util.*;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
@@ -76,12 +73,12 @@ public class WatchFileTreeModel extends FileTreeModel {
         super(fileSystemView);
     }
 
-    public WatchFileTreeModel(final FileSystemView fileSystemView, final File root, final boolean showHiddenFiles) {
+    public WatchFileTreeModel(final FileSystemView fileSystemView, final boolean showHiddenFiles, final File... roots) {
-        super(fileSystemView, root, showHiddenFiles);
+        super(fileSystemView, showHiddenFiles, roots);
     }
 
-    public WatchFileTreeModel(final FileSystemView fileSystemView, final Path root, final boolean showHiddenFiles) {
+    public WatchFileTreeModel(final FileSystemView fileSystemView, final boolean showHiddenFiles, final Path... roots) {
-        super(fileSystemView, root, showHiddenFiles);
+        super(fileSystemView, showHiddenFiles, roots);
     }
 
     @Override

core/src/test/java/ui/tree/FileTreeDemo.java

@@ -42,7 +42,7 @@ public class FileTreeDemo implements ComponentDemo {
 
     @Override
     public JComponent createComponent() {
-        FileTree tree = new WatchFileTree(null, false);
+        FileTree tree = new WatchFileTree(false);
         DemoPanel panel = new DemoPanel(new OverlayScrollPane(tree), new BorderLayout(), 0);
         JPanel controlPanel = panel.addControls();
         controlPanel.add(new JCheckBox("Show hidden files") {