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Utility classes developed at Adrian Smith Software (A.S.S.)
package com.databasesandlife.util.swing;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
/**
* Represents a tree node in a hierarchy/detail situation, such as in the
* Windows Explorer. Has following features:
*
* - Each node belongs to exactly one
JTree with exactly one TreeModel.
* The root node stores these. Through a node's parents one gets to the root, and thus these.
* - Assumes that children are cached, and that subclass implements
fetchChildren, called once.
* - Assumes that per program only one such tree exists (public static TreeModel).
*
- Assumes that parent is known at node creation time. Parent can be changed later.
*
- If
parent==null then this node is root. In which case it stores table model and tree.
* All nodes have getTableModel etc methods, they just call parent.getTableModel until
* root is found.
* - Has utility methods such as
deleteNode0, redraw, getTreePath etc.
* - Comes with a
Node.CellRenderer, allowing icon,text,extra-text to be displayed
* - Supports creation of context menus, through
newPopupMenu
* - Installs itself into a Tree (e.g. created in NetBeans), remembers static TreeModel.
*
- On tree right-click, pop-up menu opened
*
- On tree left-click, detail panel changed (with default "no detail panel")
*
* Usage:
*
* Tree t = new Tree(); // from NetBeans UI designer
* MyRootNode n = new MyNode(null); // extends MasterDetailTreeNode, parent==null
* n.installIntoTreeAsRootNode(t);
*
*
* @author This source is copyright Adrian Smith and licensed under the LGPL 3.
* @see Project on GitHub
*/
@SuppressWarnings("serial")
public abstract class MasterDetailTreeNode
implements TreeNode, java.io.Serializable {
protected class CellRenderer extends JPanel implements TreeCellRenderer {
JLabel icon = new JLabel(), text = new JLabel(), extraText = new JLabel();
public CellRenderer() {
setLayout(new BorderLayout());
add(icon, BorderLayout.WEST);
var p = new JPanel();
p.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
p.add(text);
p.add(extraText);
p.setOpaque(false);
add(p, BorderLayout.CENTER);
icon.setPreferredSize(new Dimension(18, 200));
text.setOpaque(true);
extraText.setOpaque(true);
setOpaque(false);
}
public Component getTreeCellRendererComponent(
JTree jTree, Object obj, boolean isSelected, boolean isExpanded,
boolean isLeaf, int row, boolean hasFocus
) {
var node = (MasterDetailTreeNode) obj;
var isDropTarget = (node == candidateDropTarget);
text.setBackground(isSelected ? UIManager.getColor("Tree.selectionBackground")
: isDropTarget ? Color.LIGHT_GRAY
: UIManager.getColor("Tree.textBackground"));
text.setForeground(isSelected ? UIManager.getColor("Tree.selectionForeground")
: UIManager.getColor("Tree.textForeground"));
text.setText(" " + node.getTreeText());
icon.setIcon(node.getTreeIcon());
extraText.setText(node.getExtraText() + " ");
extraText.setBackground(text.getBackground());
extraText.setForeground(node.getExtraTextColor().equals(Color.black)
? text.getForeground() : node.getExtraTextColor());
setPreferredSize(new Dimension(text.getPreferredSize().width
+ icon.getPreferredSize().width + extraText.getPreferredSize().width, 20)); // height irrelevant
return this;
}
}
protected class TreeListener extends MouseAdapter implements TreeSelectionListener, DropTargetListener {
public JPanel detailPanelContainer, defaultDetailPanel;
public TreeListener(JPanel cont, JPanel def) { detailPanelContainer=cont; defaultDetailPanel=def; }
protected MasterDetailTreeNode getNodeUnderXY(int x, int y) {
var selectedRow = tree.getRowForLocation(x, y);
var selectedPath = tree.getPathForLocation(x, y);
if(selectedRow == -1) return null;
return (MasterDetailTreeNode) selectedPath.getLastPathComponent();
}
public void mouseReleased(java.awt.event.MouseEvent evt) {
if (evt.isPopupTrigger()) {
var node = getNodeUnderXY(evt.getX(), evt.getY());
if (node != null) {
tree.setSelectionPath(node.newTreePath());
final JPopupMenu menu = node.newPopupMenu();
// if not invokeLater, then new tree selection is only shown
// after pop-up menu disappears
final MouseEvent evt2 = evt;
if (menu != null) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
tree.add(menu);
menu.show(tree, evt2.getX(), evt2.getY());
}
});
}
}
}
}
/** Node selection changed */
public void valueChanged(javax.swing.event.TreeSelectionEvent evt) {
JPanel detailPanel;
var newTP = evt.getNewLeadSelectionPath();
if (newTP != null) {
var node = (MasterDetailTreeNode) newTP.getLastPathComponent();
detailPanel = node.newDetailJPanel();
} else {
detailPanel = defaultDetailPanel;
}
detailPanelContainer.removeAll();
detailPanelContainer.add(detailPanel);
detailPanel.requestFocus();
detailPanelContainer.revalidate();
}
protected boolean isDragOk(DropTargetDragEvent e, MasterDetailTreeNode node) {
// 1. flavor ok ?
var flavorOk = false;
DataFlavor[] flavors = node.getAcceptableDropFlavors();
for (var i = 0; i < flavors.length; i++)
if (e.isDataFlavorSupported(flavors[i])) flavorOk = true;
if ( ! flavorOk) return false;
// 2. action ok ?
if ((e.getSourceActions() & node.getAcceptableDropActions()) == 0)
return false;
return true;
}
protected void change(MasterDetailTreeNode newNode) {
var oldNode = candidateDropTarget;
candidateDropTarget = newNode;
if (oldNode == newNode) return;
if (oldNode != null) oldNode.redraw();
if (newNode != null) newNode.redraw();
}
protected void accept(DropTargetDragEvent e) {
if (candidateDropTarget != null) e.acceptDrag(candidateDropTarget.getAcceptableDropActions());
else e.rejectDrag();
}
public void dragEnter(DropTargetDragEvent e) {
dragOver(e);
}
public void dragOver(DropTargetDragEvent e) {
var node = getNodeUnderXY((int)e.getLocation().getX(), (int)e.getLocation().getY());
if (node == null) { change(null); accept(e); return; }
if ( ! isDragOk(e, node)) { change(null); accept(e); return; }
change(node); accept(e);
}
public void dropActionChanged(DropTargetDragEvent e) {
accept(e);
}
public void dragExit(DropTargetEvent e) {
change(null);
}
public void drop(DropTargetDropEvent e) {
candidateDropTarget.transferrableHasBeenDropped(e);
e.dropComplete(true);
change(null);
}
}
/** Contains children if loaded, or null meaning not yet loaded */
protected MasterDetailTreeNode children[] = null;
/** Must always be set, or null if root node */
protected MasterDetailTreeNode parent;
protected MasterDetailTreeNode(MasterDetailTreeNode parent) {
this.parent = parent;
}
public MasterDetailTreeNode[] getChildren() {
if (children != null) return children;
else return children = fetchChildren();
}
public void setParent(MasterDetailTreeNode n) { parent = n; }
/** if root, candidate drop target, otherwise null */
protected MasterDetailTreeNode candidateDropTarget = null;
/** if root, assigned to a tree, this is a value, otherwise null */
protected DefaultTreeModel treeModel = null;
/** if root, assigned to a tree, this is a value, otherwise null */
protected JTree tree = null;
protected JTree getTree() { if (parent == null) return tree; else return parent.getTree(); }
protected DefaultTreeModel getTreeModel() { if (parent == null) return treeModel; else return parent.getTreeModel(); }
protected MasterDetailTreeNode getRootNode() { if (parent == null) return this; else return parent.getRootNode(); }
/** Sets Node.treeModel and makes this the first node
* of it. Also sets some properties of the tree such as the cell renderer.
* This can only be called on root nodes (where parent==null)
* @param detailPanelContainer panel which should contain the detail panels
* @param defaultDetailPanel if no node selected, this panel is shown in detailContainingPanel */
public void installIntoTreeAsRootNode(JTree tree, JPanel detailPanelContainer, JPanel defaultDetailPanel) {
if (parent != null) throw new IllegalStateException("trying to install non-root node into tree as root node");
this.tree = tree;
tree.setModel(treeModel = new DefaultTreeModel(this));
tree.setCellRenderer(new CellRenderer());
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setExpandsSelectedPaths(true);
var l = new TreeListener(detailPanelContainer, defaultDetailPanel);
tree.addMouseListener(l);
tree.addTreeSelectionListener(l);
new DropTarget(tree, DnDConstants.ACTION_COPY, l);
}
protected String getLeafNameForNodeKey(String key) {
var dotPosition = -1;
while (true) {
int newDotPosition;
if (dotPosition == -1) newDotPosition = key.indexOf(".");
else newDotPosition = key.indexOf(".", dotPosition+1);
if (newDotPosition == -1) break;
else dotPosition = newDotPosition;
}
return key.substring(dotPosition+1);
}
/** Deletes a node, which must be a member of this's children. Tree
* model is informed. */
protected void deleteNode0(MasterDetailTreeNode node) {
// create new children
MasterDetailTreeNode[] newChildren = new MasterDetailTreeNode[children.length - 1];
var newChildrenPos = 0;
var oldElementInOldChildren = -1;
for (var childrenPos = 0; childrenPos < children.length; childrenPos++)
if (children[childrenPos] == node)
oldElementInOldChildren = childrenPos;
else
newChildren[newChildrenPos++] = children[childrenPos];
if (oldElementInOldChildren == -1 || newChildrenPos != newChildren.length)
throw new RuntimeException("elements found != 1");
children = newChildren;
// inform tree model
getTreeModel().nodesWereRemoved(this,
new int[] { oldElementInOldChildren },
new MasterDetailTreeNode[] { node });
}
protected void informTreeModelThatNodeHasRadicallyChanged() {
MasterDetailTreeNode[] siblings = parent.getChildren();
var thisIndexInParent = -1;
for (var i = 0; i < siblings.length; i++)
if (siblings[i] == this) thisIndexInParent = i;
if (thisIndexInParent == -1) throw new RuntimeException("this not found");
getTreeModel().nodesChanged(parent,
new int[] { thisIndexInParent });
}
public TreePath newTreePath() {
var path = new Vector<>();
var n = this;
while (n != null) {
path.insertElementAt(n, 0);
n = n.parent;
}
return new TreePath(path.toArray());
}
public void select() {
var tree = getTree();
var path = newTreePath();
tree.setSelectionPath(path);
tree.scrollPathToVisible(path);
}
public void redraw() {
getTreeModel().nodeChanged(this);
}
// from http://www.jguru.com/faq/view.jsp?EID=513951
protected int expandJTreeNode (javax.swing.JTree tree,
javax.swing.tree.TreeModel model,
MasterDetailTreeNode node, int row)
{
if (node != null && !model.isLeaf(node)) {
tree.expandRow(row);
for (var index = 0;
row + 1 < tree.getRowCount() &&
index < model.getChildCount(node);
index++)
{
row++;
var child = (MasterDetailTreeNode) model.getChild(node, index);
if (child == null)
break;
javax.swing.tree.TreePath path;
while ((path = tree.getPathForRow(row)) != null &&
path.getLastPathComponent() != child)
row++;
if (path == null)
break;
row = expandJTreeNode(tree, model, child, row);
}
}
return row;
}
public void expandAllChildren() {
var tree = getTree();
var model = getTreeModel();
var thisRow = tree.getRowForPath(newTreePath());
expandJTreeNode(tree, model, this, thisRow);
}
/** Can be called anywhere on the tree. Assumes only one node selected.
* Returns null if no node selected. */
public MasterDetailTreeNode getSelectedNode() {
var p = tree.getSelectionPath();
if (p == null) return null;
return (MasterDetailTreeNode) p.getLastPathComponent();
}
// -----------------------------------------------------------------------
// Must be implemented by subclasses
// -----------------------------------------------------------------------
/** Create and return children. No caching need be done, this is done
* by getChildren() */
protected abstract MasterDetailTreeNode[] fetchChildren();
/** Create and return a Panel which can be displayed on the right hand
* side of the window, when this node is selected. */
public abstract JPanel newDetailJPanel();
/** Create and return a JPopupMenu which can be displayed when the user
* right-clicks on this node, or null for no pop-up menu */
public JPopupMenu newPopupMenu() { return null; }
/** Returns an ImageIcon which represents this icon, to be displayed to the
* left of it in the tree-view */
public abstract ImageIcon getTreeIcon();
/** Returns the text which can be used to display this icon in the
* tree-view */
public abstract String getTreeText();
/** Returns the text which is in color at the end of the name. */
public String getExtraText() { return ""; }
/** Returns the color which should be used for the extra text. */
public Color getExtraTextColor() { return Color.black; }
/** Returns array of Flavors which can be accepted, in the case a drag & drop
* attempts to drop on this node. */
public DataFlavor[] getAcceptableDropFlavors() { return new DataFlavor[0]; }
/** Returns a bitmask of acceptable actions such as
* DnDConstants.ACTION_COPY. */
public int getAcceptableDropActions() { return 0; }
/** When a Transferrable is dropped on this node, this method
* is called. In the default implementation this should never be reached,
* as a default node cannot accept any DataFlavors or accept any actions. */
public void transferrableHasBeenDropped(DropTargetDropEvent e) {
throw new RuntimeException("unreachable");
}
// -----------------------------------------------------------------------
// javax.swing.tree.TreeNode API
// -----------------------------------------------------------------------
public Enumeration children() { return new Vector<>(Arrays.asList(getChildren())).elements(); }
public TreeNode getChildAt(int param) { return getChildren()[param]; }
public int getChildCount() { return getChildren().length; }
public TreeNode getParent() { return parent; }
public boolean isLeaf() { return getChildren().length == 0; }
public int getIndex(TreeNode treeNode) {
TreeNode[] children = getChildren();
for (var i = 0; i < children.length; i++)
if (treeNode == children[i]) return i;
return -1;
}
}
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