jxtree.java

java实现浏览器等本地桌面的功能

                public void stateChanged(ChangeEvent e) {
                    repaint();
                    
                }
                
            };
        }
        return highlighterChangeListener;
    }


    /**
     * Property to enable/disable rollover support. This can be enabled
     * to show "live" rollover behaviour, f.i. the cursor over LinkModel cells. 
     * Default is disabled.
     * @param rolloverEnabled
     */
    public void setRolloverEnabled(boolean rolloverEnabled) {
        boolean old = isRolloverEnabled();
        if (rolloverEnabled == old) return;
        if (rolloverEnabled) {
            rolloverProducer = createRolloverProducer();
            addMouseListener(rolloverProducer);
            addMouseMotionListener(rolloverProducer);
            linkController = new LinkController();
            addPropertyChangeListener(linkController);
        } else {
            removeMouseListener(rolloverProducer);
            removeMouseMotionListener(rolloverProducer);
            rolloverProducer = null;
            removePropertyChangeListener(linkController);
            linkController = null;
        }
        firePropertyChange("rolloverEnabled", old, isRolloverEnabled());
    }

    /**
     * creates and returns the RolloverProducer to use with this tree.
     * A "hit" for rollover is covering the total width of the tree.
     * Additionally, a pressed to the right (but outside of the label bounds)
     * is re-dispatched as a pressed just inside the label bounds. This 
     * is a first go for #166-swingx.
     * 
     * @return
     */
    protected RolloverProducer createRolloverProducer() {
        RolloverProducer r = new RolloverProducer() {
            
            @Override
            public void mousePressed(MouseEvent e) {
                JXTree tree = (JXTree) e.getComponent();
                Point mousePoint = e.getPoint();
              int labelRow = tree.getRowForLocation(mousePoint.x, mousePoint.y);
              // default selection
              if (labelRow >= 0) return;
              int row = tree.getClosestRowForLocation(mousePoint.x, mousePoint.y);
              Rectangle bounds = tree.getRowBounds(row);
              if (bounds == null) {
                  row = -1;
              } else {
                  if ((bounds.y + bounds.height < mousePoint.y) || 
                       bounds.x > mousePoint.x)   {
                      row = -1;
                  }
              }
              // no hit
              if (row < 0) return;
              tree.dispatchEvent(new MouseEvent(tree, e.getID(), e.getWhen(), 
                      e.getModifiers(), bounds.x + bounds.width - 2, mousePoint.y,
                      e.getClickCount(), e.isPopupTrigger(), e.getButton()));
            }

            protected void updateRolloverPoint(JComponent component,
                    Point mousePoint) {
                JXTree tree = (JXTree) component;
                int row = tree.getClosestRowForLocation(mousePoint.x, mousePoint.y);
                Rectangle bounds = tree.getRowBounds(row);
                if (bounds == null) {
                    row = -1;
                } else {
                    if ((bounds.y + bounds.height < mousePoint.y) || 
                            bounds.x > mousePoint.x)   {
                           row = -1;
                       }
                }
                int col = row < 0 ? -1 : 0;
                rollover.x = col;
                rollover.y = row;
            }

        };
        return r;
    }

  
   
    /**
     * returns the rolloverEnabled property.
     * @return
     */
    public boolean isRolloverEnabled() {
        return rolloverProducer != null;
    }


    /**
     * listens to rollover properties. 
     * Repaints effected component regions.
     * Updates link cursor.
     * 
     * @author Jeanette Winzenburg
     */
    public  class LinkController implements PropertyChangeListener {


        private Cursor oldCursor;
        public void propertyChange(PropertyChangeEvent evt) {
            if (RolloverProducer.ROLLOVER_KEY.equals(evt.getPropertyName())) {
                    rollover((JXTree) evt.getSource(), (Point) evt.getOldValue(),
                            (Point) evt.getOldValue());
            } 
        }
        
        
//    -------------------------------------JTree rollover
        
        private void rollover(JXTree tree, Point oldLocation, Point newLocation) {
            //setLinkCursor(list, newLocation);
            // JW: conditional repaint not working?
            tree.repaint();
//            if (oldLocation != null) {
//                Rectangle r = tree.getRowBounds(oldLocation.y);
////                r.x = 0;
////                r.width = table.getWidth();
//                if (r != null)
//                tree.repaint(r);
//            }
//            if (newLocation != null) {
//                Rectangle r = tree.getRowBounds(newLocation.y);
////                r.x = 0;
////                r.width = table.getWidth();
//                if (r != null)
//                tree.repaint(r);
//            }
        }

    }


    
    private DelegatingRenderer getDelegatingRenderer() {
        if (delegatingRenderer == null) {
            // only called once... to get hold of the default?
            delegatingRenderer = new DelegatingRenderer();
            delegatingRenderer.setDelegateRenderer(super.getCellRenderer());
        }
        return delegatingRenderer;
    }

    public TreeCellRenderer getCellRenderer() {
        return getDelegatingRenderer();
    }

    public void setCellRenderer(TreeCellRenderer renderer) {
        // PENDING: do something against recursive setting
        // == multiple delegation...
        getDelegatingRenderer().setDelegateRenderer(renderer);
        super.setCellRenderer(delegatingRenderer);
    }

    /**
     * sets the icon for the handle of an expanded node.
     * 
     * Note: this will only succeed if the current ui delegate is
     * a BasicTreeUI otherwise it will do nothing.
     * 
     * @param expanded
     */
    public void setExpandedIcon(Icon expanded) {
        if (getUI() instanceof BasicTreeUI) {
            ((BasicTreeUI) getUI()).setExpandedIcon(expanded);
        }
    }
    
    /**
     * sets the icon for the handel of a collapsed node.
     * 
     * Note: this will only succeed if the current ui delegate is
     * a BasicTreeUI otherwise it will do nothing.
     *  
     * @param collapsed
     */
    public void setCollapsedIcon(Icon collapsed) {
        if (getUI() instanceof BasicTreeUI) {
            ((BasicTreeUI) getUI()).setCollapsedIcon(collapsed);
        }
    }
    
    /**
     * set the icon for a leaf node.
     * 
     * Note: this will only succeed if current renderer is a 
     * DefaultTreeCellRenderer.
     * 
     * @param leafIcon
     */
    public void setLeafIcon(Icon leafIcon) {
        getDelegatingRenderer().setLeafIcon(leafIcon);
        
    }
    
    /**
     * set the icon for a open non-leaf node.
     * 
     * Note: this will only succeed if current renderer is a 
     * DefaultTreeCellRenderer.
     * 
     * @param openIcon
     */
    public void setOpenIcon(Icon openIcon) {
        getDelegatingRenderer().setOpenIcon(openIcon);
    }
    
    /**
     * set the icon for a closed non-leaf node.
     * 
     * Note: this will only succeed if current renderer is a 
     * DefaultTreeCellRenderer.
     * 
     * @param closedIcon
     */
    public void setClosedIcon(Icon closedIcon) {
        getDelegatingRenderer().setClosedIcon(closedIcon);
    }
    
    /**
     * Property to control whether per-tree icons should be 
     * copied to the renderer on setCellRenderer.
     * 
     * the default is false for backward compatibility.
     * 
     * PENDING: should update the current renderer's icons when 
     * setting to true?
     * 
     * @param overwrite
     */
    public void setOverwriteRendererIcons(boolean overwrite) {
        if (overwriteIcons == overwrite) return;
        boolean old = overwriteIcons;
        this.overwriteIcons = overwrite;
        firePropertyChange("overwriteRendererIcons", old, overwrite);
    }

    public boolean isOverwriteRendererIcons() {
        return overwriteIcons;
    }
    
    public class DelegatingRenderer implements TreeCellRenderer {
        private Icon    closedIcon = null;
        private Icon    openIcon = null;
        private Icon    leafIcon = null;
       
        private TreeCellRenderer delegate;
        
        public DelegatingRenderer() {
            initIcons(new DefaultTreeCellRenderer());
        }

        /**
         * initially sets the icons to the defaults as given
         * by a DefaultTreeCellRenderer.
         * 
         * @param renderer
         */
        private void initIcons(DefaultTreeCellRenderer renderer) {
            closedIcon = renderer.getDefaultClosedIcon();
            openIcon = renderer.getDefaultOpenIcon();
            leafIcon = renderer.getDefaultLeafIcon();
        }

        /**
         * Set the delegate renderer. 
         * Updates the folder/leaf icons. 
         * 
         * THINK: how to update? always override with this.icons, only
         * if renderer's icons are null, update this icons if they are not,
         * update all if only one is != null.... ??
         * 
         * @param delegate
         */
        public void setDelegateRenderer(TreeCellRenderer delegate) {
            if (delegate == null) {
                delegate = new DefaultTreeCellRenderer();
            }
            this.delegate = delegate;
            updateIcons();
        }
        
        /**
         * tries to set the renderers icons. Can succeed only if the
         * delegate is a DefaultTreeCellRenderer.
         * THINK: how to update? always override with this.icons, only
         * if renderer's icons are null, update this icons if they are not,
         * update all if only one is != null.... ??
         * 
         */
        private void updateIcons() {
            if (!isOverwriteRendererIcons()) return;
            setClosedIcon(closedIcon);
            setOpenIcon(openIcon);
            setLeafIcon(leafIcon);
        }

        public void setClosedIcon(Icon closedIcon) {
            if (delegate instanceof DefaultTreeCellRenderer) {
                ((DefaultTreeCellRenderer) delegate).setClosedIcon(closedIcon);
            }
            this.closedIcon = closedIcon;
        }
        
        public void setOpenIcon(Icon openIcon) {
            if (delegate instanceof DefaultTreeCellRenderer) {
                ((DefaultTreeCellRenderer) delegate).setOpenIcon(openIcon);
            }
            this.openIcon = openIcon;
        }
        
        public void setLeafIcon(Icon leafIcon) {
            if (delegate instanceof DefaultTreeCellRenderer) {
                ((DefaultTreeCellRenderer) delegate).setLeafIcon(leafIcon);
            }
            this.leafIcon = leafIcon;
        }
        
        public TreeCellRenderer getDelegateRenderer() {
            return delegate;
        }
            public Component getTreeCellRendererComponent(JTree tree, Object value, 
                    boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
                Component result = delegate.getTreeCellRendererComponent(tree, value, 
                        selected, expanded, leaf, row, hasFocus);

                    if (highlighters != null) {
                        getComponentAdapter().row = row;
                        result = highlighters.apply(result, getComponentAdapter());
                    }

                 return result;
            }
    }

    
    protected ComponentAdapter getComponentAdapter() {
        return dataAdapter;
    }

    private final ComponentAdapter dataAdapter = new TreeAdapter(this);

    protected static class TreeAdapter extends ComponentAdapter {
        private final JXTree tree;

        /**
         * Constructs a <code>TableCellRenderContext</code> for the specified
         * target component.
         *
         * @param component the target component
         */
        public TreeAdapter(JXTree component) {
            super(component);
            tree = component;
        }
        public JXTree getTree() {
            return tree;
        }

        public boolean hasFocus() {
            return tree.isFocusOwner() && (tree.getLeadSelectionRow() == row);
        }

        public Object getValueAt(int row, int column) {
            TreePath path = tree.getPathForRow(row);
            return path.getLastPathComponent();
        }

        public Object getFilteredValueAt(int row, int column) {
            /** @todo Implement filtering */
            return getValueAt(row, column);
        }

        public boolean isSelected() {
            return tree.isRowSelected(row);
        }

        public boolean isExpanded() {
            return tree.isExpanded(row);
        }

        public boolean isLeaf() {
            return tree.getModel().isLeaf(getValue());
        }

        public boolean isCellEditable(int row, int column) {
            return false;	/** @todo  */
        }

        public void setValueAt(Object aValue, int row, int column) {
            /** @todo  */
        }
        
        public String getColumnName(int columnIndex) {
            return "Column_" + columnIndex;
        }
        
        public String getColumnIdentifier(int columnIndex) {
            return null;
        }
    }

}