basictreeui.java

JAVA 所有包

        return getHandler();
    }

    /**
     * Creates the listener reponsible for getting key events from
     * the tree.
     */
    protected KeyListener createKeyListener() {
        return getHandler();
    }

    /**
     * Creates the listener responsible for getting property change
     * events from the selection model.
     */
    protected PropertyChangeListener createSelectionModelPropertyChangeListener() {
	return getHandler();
    }

    /**
     * Creates the listener that updates the display based on selection change
     * methods.
     */
    protected TreeSelectionListener createTreeSelectionListener() {
	return getHandler();
    }

    /**
     * Creates a listener to handle events from the current editor.
     */
    protected CellEditorListener createCellEditorListener() {
	return getHandler();
    }

    /**
     * Creates and returns a new ComponentHandler. This is used for
     * the large model to mark the validCachedPreferredSize as invalid
     * when the component moves.
     */
    protected ComponentListener createComponentListener() {
	return new ComponentHandler();
    }

    /**
     * Creates and returns the object responsible for updating the treestate
     * when nodes expanded state changes.
     */
    protected TreeExpansionListener createTreeExpansionListener() {
	return getHandler();
    }

    /**
     * Creates the object responsible for managing what is expanded, as
     * well as the size of nodes.
     */
    protected AbstractLayoutCache createLayoutCache() {
	if(isLargeModel() && getRowHeight() > 0) {
	    return new FixedHeightLayoutCache();
	}
	return new VariableHeightLayoutCache();
    }

    /**
     * Returns the renderer pane that renderer components are placed in.
     */
    protected CellRendererPane createCellRendererPane() {
        return new CellRendererPane();
    }

    /**
      * Creates a default cell editor.
      */
    protected TreeCellEditor createDefaultCellEditor() {
	if(currentCellRenderer != null &&
	   (currentCellRenderer instanceof DefaultTreeCellRenderer)) {
	    DefaultTreeCellEditor editor = new DefaultTreeCellEditor
		        (tree, (DefaultTreeCellRenderer)currentCellRenderer);

	    return editor;
	}
	return new DefaultTreeCellEditor(tree, null);
    }

    /**
      * Returns the default cell renderer that is used to do the
      * stamping of each node.
      */
    protected TreeCellRenderer createDefaultCellRenderer() {
	return new DefaultTreeCellRenderer();
    }

    /**
     * Returns a listener that can update the tree when the model changes.
     */
    protected TreeModelListener createTreeModelListener() {
	return getHandler();
    }

    //
    // Uninstall methods
    //

    public void uninstallUI(JComponent c) {
	completeEditing();

	prepareForUIUninstall();

	uninstallDefaults();
	uninstallListeners();
	uninstallKeyboardActions();
	uninstallComponents();

	completeUIUninstall();
    }

    protected void prepareForUIUninstall() {
    }

    protected void completeUIUninstall() {
	if(createdRenderer) {
	    tree.setCellRenderer(null);
	}
	if(createdCellEditor) {
	    tree.setCellEditor(null);
	}
	cellEditor = null;
	currentCellRenderer = null;
	rendererPane = null;
        componentListener = null;
	propertyChangeListener = null;
	mouseListener = null;
	focusListener = null;
	keyListener = null;
	setSelectionModel(null);
	treeState = null;
	drawingCache = null;
	selectionModelPropertyChangeListener = null;
	tree = null;
	treeModel = null;
	treeSelectionModel = null;
	treeSelectionListener = null;
	treeExpansionListener = null;
    }

    protected void uninstallDefaults() {
	if (tree.getTransferHandler() instanceof UIResource) {
	    tree.setTransferHandler(null);
	}
    }

    protected void uninstallListeners() {
	if(componentListener != null) {
	    tree.removeComponentListener(componentListener);
	}
        if (propertyChangeListener != null) {
	    tree.removePropertyChangeListener(propertyChangeListener);
	}
        if (mouseListener != null) {
	    tree.removeMouseListener(mouseListener);
	    if (mouseListener instanceof MouseMotionListener) {
		tree.removeMouseMotionListener((MouseMotionListener)mouseListener);
	    }
	}
        if (focusListener != null) {
	    tree.removeFocusListener(focusListener);
	}
        if (keyListener != null) {
	    tree.removeKeyListener(keyListener);
	}
	if(treeExpansionListener != null) {
	    tree.removeTreeExpansionListener(treeExpansionListener);
	}
	if(treeModel != null && treeModelListener != null) {
	    treeModel.removeTreeModelListener(treeModelListener);
	}
	if(selectionModelPropertyChangeListener != null &&
	   treeSelectionModel != null) {
	    treeSelectionModel.removePropertyChangeListener
		(selectionModelPropertyChangeListener);
	}
	if(treeSelectionListener != null && treeSelectionModel != null) {
	    treeSelectionModel.removeTreeSelectionListener
		               (treeSelectionListener);
	}
        handler = null;
    }

    protected void uninstallKeyboardActions() {
	SwingUtilities.replaceUIActionMap(tree, null);
	SwingUtilities.replaceUIInputMap(tree, JComponent.
					 WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,
					 null);
	SwingUtilities.replaceUIInputMap(tree, JComponent.WHEN_FOCUSED, null);
    }

    /**
     * Uninstalls the renderer pane.
     */
    protected void uninstallComponents() {
	if(rendererPane != null) {
	    tree.remove(rendererPane);
	}
    }

    /**
     * Recomputes the right margin, and invalidates any tree states
     */
    private void redoTheLayout() {
	if (treeState != null) {
	    treeState.invalidateSizes();
	}
    }

    /**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        super.getBaseline(c, width, height);
        UIDefaults lafDefaults = UIManager.getLookAndFeelDefaults();
        Component renderer = (Component)lafDefaults.get(
                BASELINE_COMPONENT_KEY);
        if (renderer == null) {
            TreeCellRenderer tcr = createDefaultCellRenderer();
            renderer = tcr.getTreeCellRendererComponent(
                    tree, "a", false, false, false, -1, false);
            lafDefaults.put(BASELINE_COMPONENT_KEY, renderer);
        }
        int rowHeight = tree.getRowHeight();
        int baseline;
        if (rowHeight > 0) {
            baseline = renderer.getBaseline(Integer.MAX_VALUE, rowHeight);
        }
        else {
            Dimension pref = renderer.getPreferredSize();
            baseline = renderer.getBaseline(pref.width, pref.height);
        }
        return baseline + tree.getInsets().top;
    }

    /**
     * Returns an enum indicating how the baseline of the component
     * changes as the size changes.
     *
     * @throws NullPointerException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(
            JComponent c) {
        super.getBaselineResizeBehavior(c);
        return Component.BaselineResizeBehavior.CONSTANT_ASCENT;
    }

    //
    // Painting routines.
    //

    public void paint(Graphics g, JComponent c) {
	if (tree != c) {
	    throw new InternalError("incorrect component");
	}

	// Should never happen if installed for a UI
	if(treeState == null) {
	    return;
	}

	Rectangle        paintBounds = g.getClipBounds();
	Insets           insets = tree.getInsets();
	TreePath         initialPath = getClosestPathForLocation
	                               (tree, 0, paintBounds.y);
	Enumeration      paintingEnumerator = treeState.getVisiblePathsFrom
	                                      (initialPath);
	int              row = treeState.getRowForPath(initialPath);
	int              endY = paintBounds.y + paintBounds.height;

	drawingCache.clear();

	if(initialPath != null && paintingEnumerator != null) {
	    TreePath   parentPath = initialPath;

	    // Draw the lines, knobs, and rows

	    // Find each parent and have them draw a line to their last child
	    parentPath = parentPath.getParentPath();
	    while(parentPath != null) {
		paintVerticalPartOfLeg(g, paintBounds, insets, parentPath);
		drawingCache.put(parentPath, Boolean.TRUE);
		parentPath = parentPath.getParentPath();
	    }

	    boolean         done = false;
	    // Information for the node being rendered.
	    boolean         isExpanded;
	    boolean         hasBeenExpanded;
	    boolean         isLeaf;
	    Rectangle       boundsBuffer = new Rectangle();
	    Rectangle       bounds;
	    TreePath        path;
	    boolean         rootVisible = isRootVisible();

	    while(!done && paintingEnumerator.hasMoreElements()) {
		path = (TreePath)paintingEnumerator.nextElement();
		if(path != null) {
		    isLeaf = treeModel.isLeaf(path.getLastPathComponent());
		    if(isLeaf)
			isExpanded = hasBeenExpanded = false;
		    else {
			isExpanded = treeState.getExpandedState(path);
			hasBeenExpanded = tree.hasBeenExpanded(path);
		    }
                    bounds = getPathBounds(path, insets, boundsBuffer);
		    if(bounds == null)
			// This will only happen if the model changes out
			// from under us (usually in another thread).
			// Swing isn't multithreaded, but I'll put this
			// check in anyway.
			return;
		    // See if the vertical line to the parent has been drawn.
		    parentPath = path.getParentPath();
		    if(parentPath != null) {
			if(drawingCache.get(parentPath) == null) {
			    paintVerticalPartOfLeg(g, paintBounds,
						   insets, parentPath);
			    drawingCache.put(parentPath, Boolean.TRUE);
			}
			paintHorizontalPartOfLeg(g, paintBounds, insets,
						 bounds, path, row,
						 isExpanded,
						 hasBeenExpanded, isLeaf);
		    }
		    else if(rootVisible && row == 0) {
			paintHorizontalPartOfLeg(g, paintBounds, insets,
						 bounds, path, row,
						 isExpanded,
						 hasBeenExpanded, isLeaf);
		    }
		    if(shouldPaintExpandControl(path, row, isExpanded,
						hasBeenExpanded, isLeaf)) {
			paintExpandControl(g, paintBounds, insets, bounds,
					   path, row, isExpanded,
					   hasBeenExpanded, isLeaf);
		    }
		    paintRow(g, paintBounds, insets, bounds, path,
				 row, isExpanded, hasBeenExpanded, isLeaf);
		    if((bounds.y + bounds.height) >= endY)
			done = true;
		}
		else {
		    done = true;
		}
		row++;
	    }
	}

        paintDropLine(g);

	// Empty out the renderer pane, allowing renderers to be gc'ed.
	rendererPane.removeAll();
    }

    private boolean isDropLine(JTree.DropLocation loc) {
        return loc != null && loc.getPath() != null && loc.getChildIndex() != -1;
    }

    private void paintDropLine(Graphics g) {
        JTree.DropLocation loc = tree.getDropLocation();
        if (!isDropLine(loc)) {
            return;
        }

        Color c = UIManager.getColor("Tree.dropLineColor");
        if (c != null) {
            g.setColor(c);
            Rectangle rect = getDropLineRect(loc);
            g.fillRect(rect.x, rect.y, rect.width, rect.height);
        }
    }

    private Rectangle getDropLineRect(JTree.DropLocation loc) {
        Rectangle rect = null;
        TreePath path = loc.getPath();
        int index = loc.getChildIndex();
        boolean ltr = leftToRight;

        Insets insets = tree.getInsets();

        if (tree.getRowCount() == 0) {
            rect = new Rectangle(insets.left,
                                 insets.top,
                                 tree.getWidth() - insets.left - insets.right,
                                 0);
        } else {
            int row = tree.getRowForPath(path);
            TreeModel model = getModel();
            Object root = model.getRoot();

            if (path.getLastPathComponent() == root
                    && index >= model.getChildCount(root)) {

                rect = tree.getRowBounds(tree.getRowCount() - 1);
                rect.y = rect.y + rect.height;
                Rectangle xRect;

                if (!tree.isRootVisible()) {
                    xRect = tree.getRowBounds(0);
                } else if (model.getChildCount(root) == 0){
                    xRect = tree.getRowBounds(0);
                    xRect.x += totalChildIndent;
                    xRect.width -= totalChildIndent + totalChildIndent;
                } else {
                    TreePath lastChildPath = path.pathByAddingChild(
                        model.getChild(root, model.getChildCount(root) - 1));
                    xRect = tree.getPathBounds(lastChildPath);
                }

                rect.x = xRect.x;
                rect.width = xRect.width;
            } else {
                rect = tree.getPathBounds(path.pathByAddingChild(
                    model.getChild(path.getLastPathComponent(), index)));
            }
        }