/*
* @(#)BasicGraphUI.java 1.0 03-JUL-04
*
* Copyright (c) 2001-2004 Gaudenz Alder
*
*/
package org.jgraph.plaf.basic;
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Dimension2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
import java.util.Map;
import java.util.TooManyListenersException;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.CellRendererPane;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.TransferHandler;
import javax.swing.UIManager;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.ActionMapUIResource;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.UIResource;
import org.jgraph.JGraph;
import org.jgraph.event.GraphLayoutCacheEvent;
import org.jgraph.event.GraphLayoutCacheListener;
import org.jgraph.event.GraphModelEvent;
import org.jgraph.event.GraphModelListener;
import org.jgraph.event.GraphSelectionEvent;
import org.jgraph.event.GraphSelectionListener;
import org.jgraph.graph.AbstractCellView;
import org.jgraph.graph.AttributeMap;
import org.jgraph.graph.BasicMarqueeHandler;
import org.jgraph.graph.CellHandle;
import org.jgraph.graph.CellView;
import org.jgraph.graph.CellViewRenderer;
import org.jgraph.graph.ConnectionSet;
import org.jgraph.graph.DefaultGraphModel;
import org.jgraph.graph.EdgeRenderer;
import org.jgraph.graph.EdgeView;
import org.jgraph.graph.GraphCell;
import org.jgraph.graph.GraphCellEditor;
import org.jgraph.graph.GraphConstants;
import org.jgraph.graph.GraphContext;
import org.jgraph.graph.GraphLayoutCache;
import org.jgraph.graph.GraphModel;
import org.jgraph.graph.GraphSelectionModel;
import org.jgraph.graph.GraphTransferHandler;
import org.jgraph.graph.ParentMap;
import org.jgraph.graph.PortView;
import org.jgraph.plaf.GraphUI;
/**
* The basic L&F for a graph data structure.
*
* @version 1.0 1/1/02
* @author Gaudenz Alder
*/
public class BasicGraphUI extends GraphUI implements Serializable {
/**
* Controls live-preview in dragEnabled mode. This is used to disable
* live-preview in dragEnabled mode on Java 1.4.0 to workaround a bug that
* cause the VM to hang during concurrent DnD and repaints. Is this still
* required?
*/
public static final boolean DNDPREVIEW = System.getProperty("java.version")
.compareTo("1.4.0") < 0
|| System.getProperty("java.version").compareTo("1.4.0") > 0;
/** Border in pixels to scroll if marquee or dragging are active. */
public static int SCROLLBORDER = 18;
/** Multiplicator for width and height when autoscrolling (=stepsize). */
public static float SCROLLSTEP = 0.05f;
/** The maximum number of cells to paint when dragging. */
public static int MAXCELLS = 20;
/** The maximum number of handles to paint individually. */
public static int MAXHANDLES = 20;
/** Maximum number of cells to compute clipping bounds for. */
public static int MAXCLIPCELLS = 20;
/** Minimum preferred size. */
protected Dimension preferredMinSize;
/** Component that we're going to be drawing into. */
protected JGraph graph;
/** Reference to the graph's view (geometric pattern). */
protected GraphLayoutCache graphLayoutCache;
/** Current editor for the graph. */
protected GraphCellEditor cellEditor;
/**
* Set to false when editing and shouldSelectCell() returns true meaning the
* node should be selected before editing, used in completeEditing.
*/
protected boolean stopEditingInCompleteEditing;
/** Used to paint the CellRenderer. */
protected CellRendererPane rendererPane;
/** Size needed to completely display all the cells. */
protected Dimension preferredSize;
/** Is the preferredSize valid? */
protected boolean validCachedPreferredSize;
/** Used to determine what to display. */
protected GraphModel graphModel;
/** Model maintaining the selection. */
protected GraphSelectionModel graphSelectionModel;
/** Handle that we are going to use. */
protected CellHandle handle;
/** Marquee that we are going to use. */
protected BasicMarqueeHandler marquee;
// Following 4 ivars are only valid when editing.
/**
* When editing, this will be the Component that is doing the actual
* editing.
*/
protected Component editingComponent;
/** The focused cell under the mousepointer. */
protected CellView focus;
/** Path that is being edited. */
protected Object editingCell;
/** Set to true if the editor has a different size than the renderer. */
protected boolean editorHasDifferentSize;
/** Needed to exchange information between Transfer- and MouseListener. */
protected Point insertionLocation;
/**
* Needed to exchange information between DropTargetHandler and
* TransferHandler.
*/
protected int dropAction = TransferHandler.NONE;
/**
* If ture, a the view under mousepointer will be snapped to the grid lines
* during a drag operation. If snap-to-grid mode is disabled, views are
* moved by a snap increment.
*/
protected boolean snapSelectedView = false;
// Cached listeners
/** Listens for JGraph property changes and updates display. */
protected PropertyChangeListener propertyChangeListener;
/** Listens for Mouse events. */
protected MouseListener mouseListener;
/** Listens for KeyListener events. */
protected KeyListener keyListener;
/** Listens for Component events. */
protected ComponentListener componentListener;
/** Listens for CellEditor events. */
protected CellEditorListener cellEditorListener = createCellEditorListener();
/** Updates the display when the selection changes. */
protected GraphSelectionListener graphSelectionListener;
/** Is responsible for updating the view based on model events. */
protected GraphModelListener graphModelListener;
/** Updates the display when the view has changed. */
protected GraphLayoutCacheListener graphLayoutCacheListener;
/** The default TransferHandler. */
protected TransferHandler defaultTransferHandler;
/** The default DropTargetListener. */
protected GraphDropTargetListener defaultDropTargetListener;
/** The drop target where the default listener was last installed. */
protected DropTarget dropTarget = null;
public static ComponentUI createUI(JComponent x) {
return new BasicGraphUI();
}
public BasicGraphUI() {
super();
}
//
// Methods for configuring the behavior of the graph. None of them
// push the value to the JGraph instance. You should really only
// call these methods on the JGraph instance.
//
/**
* Sets the GraphModel. This invokes <code>updateSize</code>.
*/
protected void setModel(GraphModel model) {
cancelEditing(graph);
if (graphModel != null && graphModelListener != null)
graphModel.removeGraphModelListener(graphModelListener);
graphModel = model;
if (graphModel != null && graphModelListener != null)
graphModel.addGraphModelListener(graphModelListener);
if (graphModel != null) // jmv : to avoid NullPointerException
updateSize();
}
/**
* Sets the GraphLayoutCache (geometric pattern). This invokes
* <code>updateSize</code>.
*/
protected void setGraphLayoutCache(GraphLayoutCache cache) {
cancelEditing(graph);
if (graphLayoutCache != null && graphLayoutCacheListener != null)
graphLayoutCache
.removeGraphLayoutCacheListener(graphLayoutCacheListener);
graphLayoutCache = cache;
if (graphLayoutCache != null && graphLayoutCacheListener != null)
graphLayoutCache
.addGraphLayoutCacheListener(graphLayoutCacheListener);
updateSize();
}
/**
* Sets the marquee handler.
*/
protected void setMarquee(BasicMarqueeHandler marqueeHandler) {
marquee = marqueeHandler;
}
/**
* Resets the selection model. The appropriate listeners are installed on
* the model.
*/
protected void setSelectionModel(GraphSelectionModel newLSM) {
cancelEditing(graph);
if (graphSelectionListener != null && graphSelectionModel != null)
graphSelectionModel
.removeGraphSelectionListener(graphSelectionListener);
graphSelectionModel = newLSM;
if (graphSelectionModel != null && graphSelectionListener != null)
graphSelectionModel
.addGraphSelectionListener(graphSelectionListener);
if (graph != null)
graph.repaint();
}
//
// GraphUI methods
//
/**
*
*/
/**
* Returns the handle that is currently active, or null, if no handle is
* currently active. Typically, the returned objects are instances of the
* RootHandle inner class.
*/
public CellHandle getHandle() {
return handle;
}
/**
* Returns the current drop action.
*/
public int getDropAction() {
return dropAction;
}
/**
* Returns the cell that has the focus.
*/
protected Object getFocusedCell() {
if (focus != null)
return focus.getCell();
return null;
}
/** Get the preferred Size for a cell view. */
public Dimension2D getPreferredSize(JGraph graph, CellView view) {
// Either label or icon
if (view != null) {
Object cell = view.getCell();
String valueStr = graph.convertValueToString(cell);
boolean label = (valueStr != null && valueStr.length() > 0);
boolean icon = GraphConstants.getIcon(view.getAllAttributes()) != null;
if (label || icon) {
boolean focus = (getFocusedCell() == cell) && graph.hasFocus();
// Only ever removed when UI changes, this is OK!
Component component = view.getRendererComponent(graph, focus,
false, false);
if (component != null) {
graph.add(component);
component.validate();
Dimension d = component.getPreferredSize();
int inset = 2 * GraphConstants.getInset(view
.getAllAttributes());
d.width += inset;
d.height += inset;
return d;
}
}
if (view.getBounds() == null)
view.update();
Rectangle2D bounds = view.getBounds();
return new Dimension((int) bounds.getWidth(), (int) bounds
.getHeight());
}
return null;
}
//
// Insertion Location
//
// Used to track the location of the mousepointer during Drag-and-Drop.
//
/**
* Returns the current location of the Drag-and-Drop activity.
*/
public Point getInsertionLocation() {
return insertionLocation;
}
/**
* Sets the current location for Drag-and-Drop activity. Should be set to
* null after a drop. Used from within DropTargetListener.
*/
public void setInsertionLocation(Point p) {
insertionLocation = p;
}
//
// Selection
//
/**
* From GraphUI interface.
*/
public void selectCellsForEvent(JGraph graph, Object[] cells,
MouseEvent event) {
selectCellsForEvent(cells, event);
}
/**
* Messaged to update the selection based on a MouseEvent for a group of
* cells. If the event is a toggle selection event, the cells are either
* selected, or deselected. Otherwise the cells are selected.
*/
public void selectCellsForEvent(Object[] cells, MouseEvent event) {
if (cells == null || !graph.isSelectionEnabled())
return;
// Toggle selection
if (isToggleSelectionEvent(event)) {
for (int i = 0; i < cells.length; i++)
toggleSelectionCellForEvent(cells[i], event);
// Select cells
} else if (isAddToSelectionEvent(event))
graph.addSelectionCells(cells);
else
graph.setSelectionCells(cells);
}
/**
* Messaged to update the selection based on a MouseEvent over a particular
* cell. If the event is a toggle selection event, the cell is either
* selected, or deselected. Otherwise the cell is selected.
*/
public void selectCellForEvent(Object cell, MouseEvent event) {
if (graph.isSelectionEnabled()) {
// Toggle selection
if (isToggleSelectionEvent(event))
toggleSelectionCellForEvent(cell, event);
// Select cell
else if (isAddToSelectionEvent(event))
graph.addSelectionCell(cell);
else
graph.setSelectionCell(cell);
}
}
/**
* Messaged to update the selection based on a toggle selection event, which
* means the cell's selection state is inverted.
*/
protected void toggleSelectionCellForEvent(Object cell, MouseEvent event) {
if (graph.isCellSelected(cell))
graph.removeSelectionCell(cell);
else
graph.addSelectionCell(cell);
}
/**
* Returning true signifies that cells are added to the selection.
*/
public boolean isAddToSelectionEvent(MouseEvent e) {
return e.isShiftDown();
}
/**
* Returning true signifies a mouse event on the cell should toggle the
* selection of only the cell under mouse.
*/
public boolean isToggleSelectionEvent(MouseEvent e) {
switch (Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()) {
case InputEvent.CTRL_MASK:
return e.isControlDown();
case InputEvent.ALT_MASK:
return e.isAltDown();
case InputEvent.META_MASK:
return e.isMetaDown();
default:
return false;
}
}
/**
* Returning true signifies the marquee handler has precedence over other
* handlers, and is receiving subsequent mouse events.
*/
public boolean isForceMarqueeEvent(MouseEvent event) {
if (marquee != null)
return marquee.isForceMarqueeEvent(event);
return false;
}
/**
* Returning true signifies a move should only be applied to one direction.
*/
public boolean isConstrainedMoveEvent(MouseEvent event) {
if (event != null)
return event.isShiftDown();
return false;
}
//
// Editing
//
/**
* Returns true if the graph is being edited. The item that is being edited
* can be returned by getEditingPath().
*/
public boolean isEditing(JGraph graph) {
return (editingComponent != null);
}
/**
* Stops the current editing session. This has no effect if the graph isn't
* being edited. Returns true if the editor allows the editing session to
* stop.
*/
public boolean stopEditing(JGraph graph) {
if (editingComponent != null && cellEditor.stopCellEditing()) {
completeEditing(false, false, true);
return true;
}
return false;
}
/**
* Cancels all current editing sessions.
*/
public void cancelEditing(JGraph graph) {
if (editingComponent != null)
completeEditing(false, true, false);
// Escape key is handled by the KeyHandler.keyPressed inner class method
}
/**
* Selects the cell and tries to edit it. Editing will fail if the
* CellEditor won't allow it for the selected item.
*/
public void startEditingAtCell(JGraph graph, Object cell) {
graph.scrollCellToVisible(cell);
if (cell != null)
startEditing(cell, null);
}
/**
* Returns the element that is being edited.
*/
public Object getEditingCell(JGraph graph) {
return editingCell;
}
//
// Install methods
//
public void installUI(JComponent c) {
if (c == null)
throw new NullPointerException(
"null component passed to BasicGraphUI.installUI()");
graph = (JGraph) c;
marquee = graph.getMarqueeHandler();
prepareForUIInstall();
// Boilerplate install block
installDefaults();
installListeners();
installKeyboardActions();
installComponents();
completeUIInstall();
}
/**
* Invoked after the <code>graph</code> instance variable has been set,
* but before any defaults/listeners have been installed.
*/
protected void prepareForUIInstall() {
// Data member initializations
stopEditingInCompleteEditing = true;
preferredSize = new Dimension();
setGraphLayoutCache(graph.getGraphLayoutCache());
setModel(graph.getModel());
}
/**
* Invoked from installUI after all the defaults/listeners have been
* installed.
*/
protected void completeUIInstall() {
// Custom install code
setSelectionModel(graph.getSelectionModel());
updateSize();
}
/**
* Invoked as part from the boilerplate install block. This sets the look
* and feel specific variables in JGraph.
*/
protected void installDefaults() {
if (graph.getBackground() == null
|| graph.getBackground() instanceof UIResource) {
graph.setBackground(UIManager.getColor("Tree.background"));
}
if (graph.getFont() == null || graph.getFont() instanceof UIResource)
graph.setFont(UIManager.getFont("Tree.font"));
// Set JGraph's laf-specific colors
graph.setMarqueeColor(UIManager.getColor("Table.gridColor"));
graph
.setHandleColor(UIManager
.getColor("MenuItem.selectionBackground"));
graph.setLockedHandleColor(UIManager.getColor("MenuItem.background"));
graph.setGridColor(UIManager.getColor("Tree.selectionBackground"));
graph.setOpaque(true);
}
/**
* Invoked as part from the boilerplate install block. This installs the
* listeners from BasicGraphUI in the graph.
*/
protected void installListeners() {
// Install Local Handlers
TransferHandler th = graph.getTransferHandler();
if (th == null || th instanceof UIResource) {
defaultTransferHandler = createTransferHandler();
graph.setTransferHandler(defaultTransferHandler);
}
if (graphLayoutCache != null) {
graphLayoutCacheListener = createGraphLayoutCacheListener();
graphLayoutCache
.addGraphLayoutCacheListener(graphLayoutCacheListener);
}
dropTarget = graph.getDropTarget();
try {
if (dropTarget != null) {
defaultDropTargetListener = new GraphDropTargetListener();
dropTarget.addDropTargetListener(defaultDropTargetListener);
}
} catch (TooManyListenersException tmle) {
// should not happen... swing drop target is multicast
}
// Install Listeners
if ((propertyChangeListener = createPropertyChangeListener()) != null)
graph.addPropertyChangeListener(propertyChangeListener);
if ((mouseListener = createMouseListener()) != null) {
graph.addMouseListener(mouseListener);
if (mouseListener instanceof MouseMotionListener) {
graph
.addMouseMotionListener((MouseMotionListener) mouseListener);
}
}
if ((keyListener = createKeyListener()) != null) {
graph.addKeyListener(keyListener);
}
if ((graphModelListener = createGraphModelListener()) != null
&& graphModel != null)
graphModel.addGraphModelListener(graphModelListener);
if ((graphSelectionListener = createGraphSelectionListener()) != null
&& graphSelectionModel != null)
graphSelectionModel
.addGraphSelectionListener(graphSelectionListener);
}
/**
* Invoked as part from the boilerplate install block.
*/
protected void installKeyboardActions() {
InputMap km = getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
SwingUtilities.replaceUIInputMap(graph,
JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, km);
km = getInputMap(JComponent.WHEN_FOCUSED);
SwingUtilities.replaceUIInputMap(graph, JComponent.WHEN_FOCUSED, km);
SwingUtilities.replaceUIActionMap(graph, createActionMap());
}
/**
* Return JTree's input map.
*/
InputMap getInputMap(int condition) {
if (condition == JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
return (InputMap) UIManager.get("Tree.ancestorInputMap");
else if (condition == JComponent.WHEN_FOCUSED)
return (InputMap) UIManager.get("Tree.focusInputMap");
return null;
}
/**
* Return the mapping between JTree's input map and JGraph's actions.
*/
ActionMap createActionMap() {
// 1: Up, 2: Right, 3: Down, 4: Left
ActionMap map = new ActionMapUIResource();
map
.put("selectPrevious", new GraphIncrementAction(1,
"selectPrevious"));
map.put("selectPreviousChangeLead", new GraphIncrementAction(1,
"selectPreviousLead"));
map.put("selectPreviousExtendSelection", new GraphIncrementAction(1,
"selectPreviousExtendSelection"));
map.put("selectParent", new GraphIncrementAction(4, "selectParent"));
map.put("selectParentChangeLead", new GraphIncrementAction(4,
"selectParentChangeLead"));
map.put("selectNext", new GraphIncrementAction(3, "selectNext"));
map.put("selectNextChangeLead", new GraphIncrementAction(3,
"selectNextLead"));
map.put("selectNextExtendSelection", new GraphIncrementAction(3,
"selectNextExtendSelection"));
map.put("selectChild", new GraphIncrementAction(2, "selectChild"));
map.put("selectChildChangeLead", new GraphIncrementAction(2,
"selectChildChangeLead"));
map.put("cancel", new GraphCancelEditingAction("cancel"));
map.put("startEditing", new GraphEditAction("startEditing"));
map.put("selectAll", new GraphSelectAllAction("selectAll", true));
map.put("clearSelection", new GraphSelectAllAction("clearSelection",
false));
return map;
}
/**
* Intalls the subcomponents of the graph, which is the renderer pane.
*/
protected void installComponents() {
if ((rendererPane = createCellRendererPane()) != null)
graph.add(rendererPane);
}
//
// Create methods.
//
/**
* Creates an instance of TransferHandler. Used for subclassers to provide
* different TransferHandler.
*/
protected TransferHandler createTransferHandler() {
return new GraphTransferHandler();
}
/**
* Creates a listener that is responsible to update the UI based on how the
* graph's bounds properties change.
*/
protected PropertyChangeListener createPropertyChangeListener() {
return new PropertyChangeHandler();
}
/**
* Creates the listener responsible for calling the correct handlers based
* on mouse events, and to select invidual cells.
*/
protected MouseListener createMouseListener() {
return new MouseHandler();
}
/**
* Creates the listener reponsible for getting key events from the graph.
*/
protected KeyListener createKeyListener() {
return new KeyHandler();
}
/**
* Creates the listener that updates the display based on selection change
* methods.
*/
protected GraphSelectionListener createGraphSelectionListener() {
return new GraphSelectionHandler();
}
/**
* Creates a listener to handle events from the current editor.
*/
protected CellEditorListener createCellEditorListener() {
return new CellEditorHandler();
}
/**
* Creates and returns a new ComponentHandler.
*/
protected ComponentListener createComponentListener() {
return new ComponentHandler();
}
/**
* Returns the renderer pane that renderer components are placed in.
*/
protected CellRendererPane createCellRendererPane() {
return new CellRendererPane();
}
/**
* Returns a listener that can update the graph when the view changes.
*/
protected GraphLayoutCacheListener createGraphLayoutCacheListener() {
return new GraphLayoutCacheHandler();
}
/**
* Returns a listener that can update the graph when the model changes.
*/
protected GraphModelListener createGraphModelListener() {
return new GraphModelHandler();
}
//
// Uninstall methods
//
public void uninstallUI(JComponent c) {
cancelEditing(graph);
uninstallListeners();
uninstallKeyboardActions();
uninstallComponents();
completeUIUninstall();
}
protected void completeUIUninstall() {
graphLayoutCache = null;
rendererPane = null;
componentListener = null;
propertyChangeListener = null;
keyListener = null;
setSelectionModel(null);
graph = null;
graphModel = null;
graphSelectionModel = null;
graphSelectionListener = null;
}
protected void uninstallListeners() {
// Uninstall Handlers
TransferHandler th = graph.getTransferHandler();
if (th == defaultTransferHandler)
graph.setTransferHandler(null);
if (graphLayoutCacheListener != null)
graphLayoutCache
.removeGraphLayoutCacheListener(graphLayoutCacheListener);
if (dropTarget != null && defaultDropTargetListener != null)
dropTarget.removeDropTargetListener(defaultDropTargetListener);
if (componentListener != null)
graph.removeComponentListener(componentListener);
if (propertyChangeListener != null)
graph.removePropertyChangeListener(propertyChangeListener);
if (mouseListener != null) {
graph.removeMouseListener(mouseListener);
if (mouseListener instanceof MouseMotionListener)
graph
.removeMouseMotionListener((MouseMotionListener) mouseListener);
}
if (keyListener != null)
graph.removeKeyListener(keyListener);
if (graphModel != null && graphModelListener != null)
graphModel.removeGraphModelListener(graphModelListener);
if (graphSelectionListener != null && graphSelectionModel != null)
graphSelectionModel
.removeGraphSelectionListener(graphSelectionListener);
}
protected void uninstallKeyboardActions() {
SwingUtilities.replaceUIActionMap(graph, null);
SwingUtilities.replaceUIInputMap(graph,
JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, null);
SwingUtilities.replaceUIInputMap(graph, JComponent.WHEN_FOCUSED, null);
}
/**
* Uninstalls the renderer pane.
*/
protected void uninstallComponents() {
if (rendererPane != null)
graph.remove(rendererPane);
}
//
// Painting routines.
//
/**
* Main painting routine.
*/
public void paint(Graphics g, JComponent c) {
if (graph != c)
throw new InternalError("BasicGraphUI cannot paint " + c.toString()
+ "; " + graph + " was expected.");
Graphics2D g2 = (Graphics2D) g;
Rectangle2D tmp = g.getClipBounds();
Rectangle2D paintBounds = new Rectangle2D.Double(tmp.getX(),
tmp.getY(), tmp.getWidth(), tmp.getHeight());
Rectangle2D real = graph.fromScreen(new Rectangle2D.Double(paintBounds
.getX(), paintBounds.getY(), paintBounds.getWidth(),
paintBounds.getHeight()));
// Paint Background (Typically Grid)
paintBackground(g);
// Remember current affine transform
AffineTransform at = g2.getTransform();
// Use anti aliasing
if (graph.isAntiAliased())
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// Use Swing's scaling
double scale = graph.getScale();
g2.scale(scale, scale);
// Paint cells
CellView[] views = graphLayoutCache.getRoots();
for (int i = 0; i < views.length; i++) {
Rectangle2D bounds = views[i].getBounds();
if (bounds != null && real != null && bounds.intersects(real))
paintCell(g, views[i], bounds, false);
}
// Reset affine transform and antialias
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
// Paint Foreground (Typically Ports)
if (!graph.isPortsScaled())
g2.setTransform(at);
paintForeground(g);
g2.setTransform(at);
// Paint Handle
if (handle != null)
handle.paint(g);
// Paint Marquee
g.setColor(graph.getMarqueeColor());
g.setXORMode(graph.getBackground());
if (marquee != null)
marquee.paint(graph, g);
g.setPaintMode();
// Empty out the renderer pane, allowing renderers to be gc'ed.
if (rendererPane != null)
rendererPane.removeAll();
}
/**
* Paints the renderer of <code>view</code> to <code>g</code> at
* <code>bounds</code>. Recursive implementation that paints the children
* first.
* <p>
* The reciever should NOT modify <code>clipBounds</code>, or
* <code>insets</code>. The <code>preview</code> flag is passed to the
* renderer, and is not used here.
*/
public void paintCell(Graphics g, CellView view, Rectangle2D bounds,
boolean preview) {
// First Paint View
if (view != null && bounds != null) {
boolean bfocus = (view == this.focus);
boolean sel = graph.isCellSelected(view.getCell());
Component component = view.getRendererComponent(graph, sel, bfocus,
preview);
rendererPane.paintComponent(g, component, graph, (int) bounds
.getX(), (int) bounds.getY(), (int) bounds.getWidth(),
(int) bounds.getHeight(), true);
}
// Then Paint Children
if (!view.isLeaf()) {
CellView[] children = view.getChildViews();
for (int i = 0; i < children.length; i++)
paintCell(g, children[i], children[i].getBounds(), preview);
}
}
//
// Background
//
/**
* Paint the background of this graph. Calls paintGrid.
*/
protected void paintBackground(Graphics g) {
if (graph.isGridVisible())
paintGrid(graph.getGridSize(), g, g.getClipBounds());
}
/**
* Paint the grid.
*/
protected void paintGrid(double gs, Graphics g, Rectangle2D r) {
// Parameter "r" is never used: remove it.
Rectangle rr = (Rectangle) g.getClipBounds();
double xl = rr.x;
double yt = rr.y;
double xr = xl + rr.width;
double yb = yt + rr.height;
double sgs = Math.max(2, gs * graph.getScale());
int xs = (int) (Math.floor(xl / sgs) * sgs);
int xe = (int) (Math.ceil(xr / sgs) * sgs);
int ys = (int) (Math.floor(yt / sgs) * sgs);
int ye = (int) (Math.ceil(yb / sgs) * sgs);
g.setColor(graph.getGridColor());
switch (graph.getGridMode()) {
case JGraph.CROSS_GRID_MODE: {
int cs = (sgs > 16.0) ? 2 : ((sgs < 8.0) ? 0 : 1);
for (double x = xs; x <= xe; x += sgs) {
for (double y = ys; y <= ye; y += sgs) {
int ix = (int) Math.round(x);
int iy = (int) Math.round(y);
g.drawLine(ix - cs, iy, ix + cs, iy);
g.drawLine(ix, iy - cs, ix, iy + cs);
}
}
}
break;
case JGraph.LINE_GRID_MODE: {
xe += (int) Math.ceil(sgs);
ye += (int) Math.ceil(sgs);
for (double x = xs; x <= xe; x += sgs) {
int ix = (int) Math.round(x);
g.drawLine(ix, ys, ix, ye);
}
for (double y = ys; y <= ye; y += sgs) {
int iy = (int) Math.round(y);
g.drawLine(xs, iy, xe, iy);
}
}
break;
case JGraph.DOT_GRID_MODE:
default:
for (double x = xs; x <= xe; x += sgs) {
for (double y = ys; y <= ye; y += sgs) {
int ix = (int) Math.round(x);
int iy = (int) Math.round(y);
g.drawLine(ix, iy, ix, iy);
}
}
break;
}
}
//
// Foreground
//
/**
* Paint the foreground of this graph. Calls paintPorts.
*/
protected void paintForeground(Graphics g) {
if (graph.isPortsVisible())
paintPorts(g, graphLayoutCache.getPorts());
}
/**
* Paint <code>ports</code>.
*/
public void paintPorts(Graphics g, CellView[] ports) {
if (ports != null) {
Rectangle r = g.getClipBounds();
for (int i = 0; i < ports.length; i++) {
if (ports[i] != null) {
Rectangle2D tmp = ports[i].getBounds();
Rectangle2D bounds = new Rectangle2D.Double(tmp.getX(), tmp
.getY(), tmp.getWidth(), tmp.getHeight());
Point2D center = new Point2D.Double(bounds.getCenterX(),
bounds.getCenterY());
if (!graph.isPortsScaled())
center = graph.toScreen(center);
bounds.setFrame(center.getX() - bounds.getWidth() / 2,
center.getY() - bounds.getHeight() / 2, bounds
.getWidth(), bounds.getHeight());
if (r == null || bounds.intersects(r))
paintCell(g, ports[i], bounds, false);
}
}
}
}
//
// Various local methods
//
/**
* Update the handle using createHandle.
*/
public void updateHandle() {
if (graphLayoutCache != null) {
Object[] cells = graphLayoutCache.getVisibleCells(graph
.getSelectionCells());
if (cells != null && cells.length > 0)
handle = createHandle(createContext(graph, cells));
else
handle = null;
}
}
protected GraphContext createContext(JGraph graph, Object[] cells) {
return new GraphContext(graph, cells);
}
/**
* Constructs the "root handle" for <code>context</code>.
*
* @param context
* reference to the context of the current selection.
*/
public CellHandle createHandle(GraphContext context) {
if (context != null && !context.isEmpty() && graph.isEnabled()) {
try {
return new RootHandle(context);
} catch (NullPointerException e) {
// ignore for now...
}
}
return null;
}
/**
* Messages the Graph with <code>graphDidChange</code>.
*/
public void updateSize() {
validCachedPreferredSize = false;
graph.graphDidChange();
updateHandle();
}
/**
* Updates the <code>preferredSize</code> instance variable, which is
* returned from <code>getPreferredSize()</code>.
*/
protected void updateCachedPreferredSize() {
Rectangle2D size = AbstractCellView.getBounds(graphLayoutCache
.getRoots());
if (size == null)
size = new Rectangle2D.Double();
Point2D psize = new Point2D.Double(size.getX() + size.getWidth(), size
.getY()
+ size.getHeight());
Dimension d = graph.getMinimumSize();
Point2D min = (d != null) ? graph
.toScreen(new Point(d.width, d.height)) : new Point(0, 0);
Point2D scaled = graph.toScreen(psize);
preferredSize = new Dimension(
(int) Math.max(min.getX(), scaled.getX()), (int) Math.max(min
.getY(), scaled.getY()));
Insets in = graph.getInsets();
if (in != null) {
preferredSize.setSize(
preferredSize.getWidth() + in.left + in.right,
preferredSize.getHeight() + in.top + in.bottom);
}
validCachedPreferredSize = true;
}
/**
* Sets the preferred minimum size.
*/
public void setPreferredMinSize(Dimension newSize) {
preferredMinSize = newSize;
}
/**
* Returns the minimum preferred size.
*/
public Dimension getPreferredMinSize() {
if (preferredMinSize == null)
return null;
return new Dimension(preferredMinSize);
}
/**
* Returns the preferred size to properly display the graph.
*/
public Dimension getPreferredSize(JComponent c) {
Dimension pSize = this.getPreferredMinSize();
if (!validCachedPreferredSize)
updateCachedPreferredSize();
if (graph != null) {
if (pSize != null)
return new Dimension(
Math.max(pSize.width, preferredSize.width), Math.max(
pSize.height, preferredSize.height));
return new Dimension(preferredSize.width, preferredSize.height);
} else if (pSize != null)
return pSize;
else
return new Dimension(0, 0);
}
/**
* Returns the minimum size for this component. Which will be the min
* preferred size or 0, 0.
*/
public Dimension getMinimumSize(JComponent c) {
if (this.getPreferredMinSize() != null)
return this.getPreferredMinSize();
return new Dimension(0, 0);
}
/**
* Returns the maximum size for this component, which will be the preferred
* size if the instance is currently in a JGraph, or 0, 0.
*/
public Dimension getMaximumSize(JComponent c) {
if (graph != null)
return getPreferredSize(graph);
if (this.getPreferredMinSize() != null)
return this.getPreferredMinSize();
return new Dimension(0, 0);
}
/**
* Messages to stop the editing session. If the UI the receiver is providing
* the look and feel for returns true from
* <code>getInvokesStopCellEditing</code>, stopCellEditing will invoked
* on the current editor. Then completeEditing will be messaged with false,
* true, false to cancel any lingering editing.
*/
protected void completeEditing() {
/* If should invoke stopCellEditing, try that */
if (graph.getInvokesStopCellEditing() && stopEditingInCompleteEditing
&& editingComponent != null) {
cellEditor.stopCellEditing();
}
/*
* Invoke cancelCellEditing, this will do nothing if stopCellEditing was
* succesful.
*/
completeEditing(false, true, false);
}
/**
* Stops the editing session. If messageStop is true the editor is messaged
* with stopEditing, if messageCancel is true the editor is messaged with
* cancelEditing. If messageGraph is true the graphModel is messaged with
* valueForCellChanged.
*/
protected void completeEditing(boolean messageStop, boolean messageCancel,
boolean messageGraph) {
if (stopEditingInCompleteEditing && editingComponent != null) {
Component oldComponent = editingComponent;
Object oldCell = editingCell;
GraphCellEditor oldEditor = cellEditor;
boolean requestFocus = (graph != null && (graph.hasFocus() || SwingUtilities
.findFocusOwner(editingComponent) != null));
editingCell = null;
editingComponent = null;
if (messageStop)
oldEditor.stopCellEditing();
else if (messageCancel)
oldEditor.cancelCellEditing();
graph.remove(oldComponent);
if (requestFocus)
graph.requestFocus();
if (messageGraph) {
Object newValue = oldEditor.getCellEditorValue();
graphLayoutCache.valueForCellChanged(oldCell, newValue);
}
updateSize();
// Remove Editor Listener
if (oldEditor != null && cellEditorListener != null)
oldEditor.removeCellEditorListener(cellEditorListener);
cellEditor = null;
}
}
/**
* Will start editing for cell if there is a cellEditor and shouldSelectCell
* returns true.
* <p>
* This assumes that cell is valid and visible.
*/
protected boolean startEditing(Object cell, MouseEvent event) {
completeEditing();
if (graph.isCellEditable(cell)) {
CellView tmp = graphLayoutCache.getMapping(cell, false);
cellEditor = tmp.getEditor();
editingComponent = cellEditor.getGraphCellEditorComponent(graph,
cell, graph.isCellSelected(cell));
if (cellEditor.isCellEditable(event)) {
Rectangle2D cellBounds = graph.getCellBounds(cell);
editingCell = cell;
Dimension2D editorSize = editingComponent.getPreferredSize();
graph.add(editingComponent);
Point2D p = getEditorLocation(cell, editorSize, graph
.toScreen(new Point2D.Double(cellBounds.getX(),
cellBounds.getY())));
editingComponent.setBounds((int) p.getX(), (int) p.getY(),
(int) editorSize.getWidth(), (int) editorSize
.getHeight());
editingCell = cell;
editingComponent.validate();
// Add Editor Listener
if (cellEditorListener == null)
cellEditorListener = createCellEditorListener();
if (cellEditor != null && cellEditorListener != null)
cellEditor.addCellEditorListener(cellEditorListener);
Rectangle2D visRect = graph.getVisibleRect();
graph.paintImmediately((int) p.getX(), (int) p.getY(),
(int) (visRect.getWidth() + visRect.getX() - cellBounds
.getX()), (int) editorSize.getHeight());
if (cellEditor.shouldSelectCell(event)
&& graph.isSelectionEnabled()) {
stopEditingInCompleteEditing = false;
try {
graph.setSelectionCell(cell);
} catch (Exception e) {
System.err.println("Editing exception: " + e);
}
stopEditingInCompleteEditing = true;
}
if (event instanceof MouseEvent) {
/*
* Find the component that will get forwarded all the mouse
* events until mouseReleased.
*/
Point componentPoint = SwingUtilities.convertPoint(graph,
new Point(event.getX(), event.getY()),
editingComponent);
/*
* Create an instance of BasicTreeMouseListener to handle
* passing the mouse/motion events to the necessary
* component.
*/
// We really want similiar behavior to getMouseEventTarget,
// but it is package private.
Component activeComponent = SwingUtilities
.getDeepestComponentAt(editingComponent,
componentPoint.x, componentPoint.y);
if (activeComponent != null) {
new MouseInputHandler(graph, activeComponent, event);
}
}
return true;
} else
editingComponent = null;
}
return false;
}
/**
* Subclassers may override this to provide a better location for the
* in-place editing of edges (if you do not inherit from the EdgeRenderer
* class).
*/
protected Point2D getEditorLocation(Object cell, Dimension2D editorSize,
Point2D pt) {
// Edges have different editor position and size
CellView view = graphLayoutCache.getMapping(cell, false);
if (view instanceof EdgeView) {
EdgeView edgeView = (EdgeView) view;
CellViewRenderer renderer = edgeView.getRenderer();
if (renderer instanceof EdgeRenderer) {
Point2D tmp = ((EdgeRenderer) renderer).getLabelPosition(edgeView);
if (tmp != null) {
pt = tmp;
pt.setLocation(Math.max(0, pt.getX() - editorSize.getWidth()
/ 2), Math.max(0, pt.getY() - editorSize.getHeight()
/ 2));
}
}
graph.toScreen(pt);
}
return pt;
}
/**
* Scroll the graph for an event at <code>p</code>.
*/
public static void autoscroll(JGraph graph, Point p) {
Rectangle view = graph.getBounds();
if (graph.getParent() instanceof JViewport)
view = ((JViewport) graph.getParent()).getViewRect();
if (view.contains(p)) {
Point target = new Point(p);
int dx = (int) (graph.getWidth() * SCROLLSTEP);
int dy = (int) (graph.getHeight() * SCROLLSTEP);
if (target.x - view.x < SCROLLBORDER)
target.x -= dx;
if (target.y - view.y < SCROLLBORDER)
target.y -= dy;
if (view.x + view.width - target.x < SCROLLBORDER)
target.x += dx;
if (view.y + view.height - target.y < SCROLLBORDER)
target.y += dy;
graph.scrollPointToVisible(target);
}
}
/**
* Updates the preferred size when scrolling (if necessary).
*/
public class ComponentHandler extends ComponentAdapter implements
ActionListener {
/**
* Timer used when inside a scrollpane and the scrollbar is adjusting.
*/
protected Timer timer;
/** ScrollBar that is being adjusted. */
protected JScrollBar scrollBar;
public void componentMoved(ComponentEvent e) {
if (timer == null) {
JScrollPane scrollPane = getScrollPane();
if (scrollPane == null)
updateSize();
else {
scrollBar = scrollPane.getVerticalScrollBar();
if (scrollBar == null || !scrollBar.getValueIsAdjusting()) {
// Try the horizontal scrollbar.
if ((scrollBar = scrollPane.getHorizontalScrollBar()) != null
&& scrollBar.getValueIsAdjusting())
startTimer();
else
updateSize();
} else
startTimer();
}
}
}
/**
* Creates, if necessary, and starts a Timer to check if need to resize
* the bounds.
*/
protected void startTimer() {
if (timer == null) {
timer = new Timer(200, this);
timer.setRepeats(true);
}
timer.start();
}
/**
* Returns the JScrollPane housing the JGraph, or null if one isn't
* found.
*/
protected JScrollPane getScrollPane() {
Component c = graph.getParent();
while (c != null && !(c instanceof JScrollPane))
c = c.getParent();
if (c instanceof JScrollPane)
return (JScrollPane) c;
return null;
}
/**
* Public as a result of Timer. If the scrollBar is null, or not
* adjusting, this stops the timer and updates the sizing.
*/
public void actionPerformed(ActionEvent ae) {
if (scrollBar == null || !scrollBar.getValueIsAdjusting()) {
if (timer != null)
timer.stop();
updateSize();
timer = null;
scrollBar = null;
}
}
} // End of BasicGraphUI.ComponentHandler
/**
* Listens for changes in the graph model and updates the view accordingly.
*/
public class GraphModelHandler implements GraphModelListener, Serializable {
public void graphChanged(GraphModelEvent e) {
Object[] removed = e.getChange().getRemoved();
// Remove from selection & focus
if (removed != null && removed.length > 0) {
// Update Focus If Necessary
for (int i = 0; i < removed.length && focus != null; i++) {
if (removed[i] == focus.getCell()) {
focus = null;
break;
}
}
// Remove from selection
graph.getSelectionModel().removeSelectionCells(removed);
}
if (graphLayoutCache != null)
graphLayoutCache.graphChanged(e.getChange());
// Get arrays
Object[] inserted = e.getChange().getInserted();
Object[] changed = e.getChange().getChanged();
// Insert
if (inserted != null && inserted.length > 0) {
// Update focus to first inserted cell
focus = graphLayoutCache.getMapping(inserted[0], false);
for (int i = 0; i < inserted.length; i++)
graph.updateAutoSize(graphLayoutCache.getMapping(
inserted[i], false));
}
// Change (update size)
if (changed != null && changed.length > 0) {
for (int i = 0; i < changed.length; i++)
graph.updateAutoSize(graphLayoutCache.getMapping(
changed[i], false));
}
// Select if not partial
if (!graphLayoutCache.isPartial()
&& graphLayoutCache.isSelectsAllInsertedCells()
&& graph.isEnabled()) {
Object[] roots = DefaultGraphModel.getRoots(graphModel,
inserted);
if (roots != null && roots.length > 0) {
focus = graphLayoutCache.getMapping(roots[0], false);
graph.setSelectionCells(roots);
}
}
updateSize();
}
} // End of BasicGraphUI.GraphModelHandler
/**
* Listens for changes in the graph view and updates the size accordingly.
*/
public class GraphLayoutCacheHandler implements GraphLayoutCacheListener,
Serializable {
/*
* (non-Javadoc)
*
* @see org.jgraph.event.GraphLayoutCacheListener#graphLayoutCacheChanged(org.jgraph.event.GraphLayoutCacheEvent)
*/
public void graphLayoutCacheChanged(GraphLayoutCacheEvent e) {
Object[] changed = e.getChange().getChanged();
if (changed != null && changed.length > 0) {
for (int i = 0; i < changed.length; i++) {
graph.updateAutoSize(graphLayoutCache.getMapping(
changed[i], false));
}
}
Object[] inserted = e.getChange().getInserted();
if (inserted != null
&& inserted.length > 0
&& graphLayoutCache.isSelectsLocalInsertedCells()
&& !(graphLayoutCache.isSelectsAllInsertedCells() && !graphLayoutCache
.isPartial()) && graph.isEnabled()) {
Object[] roots = DefaultGraphModel.getRoots(graphModel,
inserted);
if (roots != null && roots.length > 0) {
focus = graphLayoutCache.getMapping(roots[0], false);
graph.setSelectionCells(roots);
}
}
updateSize();
}
} // End of BasicGraphUI.GraphLayoutCacheHandler
/**
* Listens for changes in the selection model and updates the display
* accordingly.
*/
public class GraphSelectionHandler implements GraphSelectionListener,
Serializable {
/**
* Messaged when the selection changes in the graph we're displaying
* for. Stops editing, updates handles and displays the changed cells.
*/
public void valueChanged(GraphSelectionEvent event) {
// cancelEditing(graph);
updateHandle();
Object[] cells = event.getCells();
if (cells != null && cells.length <= MAXCLIPCELLS) {
Rectangle2D r = graph.toScreen(graph.getCellBounds(cells));
if (r != null) {
int hsize = (int) (graph.getHandleSize() * graph.getScale()) + 1;
updateHandle();
graph.repaint((int) r.getX() - hsize, (int) r.getY()
- hsize, (int) r.getWidth() + 2 * hsize, (int) r
.getHeight()
+ 2 * hsize);
}
} else
graph.repaint();
}
}
/**
* Listener responsible for getting cell editing events and updating the
* graph accordingly.
*/
public class CellEditorHandler implements CellEditorListener, Serializable {
/** Messaged when editing has stopped in the graph. */
public void editingStopped(ChangeEvent e) {
completeEditing(false, false, true);
}
/** Messaged when editing has been canceled in the graph. */
public void editingCanceled(ChangeEvent e) {
completeEditing(false, false, false);
}
} // BasicGraphUI.CellEditorHandler
/**
* This is used to get mutliple key down events to appropriately generate
* events.
*/
public class KeyHandler extends KeyAdapter implements Serializable {
/** Key code that is being generated for. */
protected Action repeatKeyAction;
/** Set to true while keyPressed is active. */
protected boolean isKeyDown;
public void keyPressed(KeyEvent e) {
if (graph != null && graph.hasFocus() && graph.isEnabled()) {
KeyStroke keyStroke = KeyStroke.getKeyStroke(e.getKeyCode(), e
.getModifiers());
if (graph.getConditionForKeyStroke(keyStroke) == JComponent.WHEN_FOCUSED) {
ActionListener listener = graph
.getActionForKeyStroke(keyStroke);
if (listener instanceof Action)
repeatKeyAction = (Action) listener;
else
repeatKeyAction = null;
} else {
repeatKeyAction = null;
if (keyStroke.getKeyCode() == KeyEvent.VK_ESCAPE) {
// System.out.println("Calling release on " + marquee);
if (marquee != null)
marquee.mouseReleased(null);
if (mouseListener != null)
mouseListener.mouseReleased(null);
updateHandle();
graph.repaint();
}
}
if (isKeyDown && repeatKeyAction != null) {
repeatKeyAction.actionPerformed(new ActionEvent(graph,
ActionEvent.ACTION_PERFORMED, ""));
e.consume();
} else
isKeyDown = true;
}
}
public void keyReleased(KeyEvent e) {
isKeyDown = false;
}
} // End of BasicGraphUI.KeyHandler
/**
* TreeMouseListener is responsible for updating the selection based on
* mouse events.
*/
public class MouseHandler extends MouseAdapter implements
MouseMotionListener, Serializable {
/* The cell under the mousepointer. */
protected CellView cell;
/* The object that handles mouse operations. */
protected Object handler;
protected transient Cursor previousCursor = null;
/**
* Invoked when a mouse button has been pressed on a component.
*/
public void mousePressed(MouseEvent e) {
handler = null;
if (!e.isConsumed() && graph.isEnabled()) {
graph.requestFocus();
int s = graph.getTolerance();
Rectangle2D r = graph.fromScreen(new Rectangle2D.Double(e
.getX()
- s, e.getY() - s, 2 * s, 2 * s));
focus = (focus != null && focus.intersects(graph, r)) ? focus
: null;
cell = graph.getNextSelectableViewAt(focus, e.getX(), e.getY());
if (focus == null)
focus = cell;
completeEditing();
if (!isForceMarqueeEvent(e)) {
if (e.getClickCount() == graph.getEditClickCount()
&& focus != null && focus.isLeaf()
&& focus.getParentView() == null
&& graph.isCellEditable(focus.getCell())
&& handleEditTrigger(cell.getCell(), e)) {
e.consume();
cell = null;
} else if (!isToggleSelectionEvent(e)) {
if (handle != null) {
handle.mousePressed(e);
handler = handle;
}
// Immediate Selection
if (!e.isConsumed() && cell != null
&& !graph.isCellSelected(cell)) {
selectCellForEvent(cell.getCell(), e);
focus = cell;
if (handle != null) {
handle.mousePressed(e);
handler = handle;
}
e.consume();
cell = null;
}
}
}
// Marquee Selection
if (!e.isConsumed() && marquee != null
&& (!isToggleSelectionEvent(e) || focus == null)) {
marquee.mousePressed(e);
handler = marquee;
}
}
}
/**
* Handles edit trigger by starting the edit and return true if the
* editing has already started.
*
* @param cell
* the cell being edited
* @param e
* the mouse event triggering the edit
* @return <code>true</code> if the editing has already started
*/
protected boolean handleEditTrigger(Object cell, MouseEvent e) {
graph.scrollCellToVisible(cell);
if (cell != null)
startEditing(cell, e);
return graph.isEditing();
}
public void mouseDragged(MouseEvent e) {
try {
autoscroll(graph, e.getPoint());
if (handler != null && handler == marquee)
marquee.mouseDragged(e);
else if (handler == null && !isEditing(graph) && focus != null) {
if (!graph.isCellSelected(focus.getCell())) {
selectCellForEvent(focus.getCell(), e);
cell = null;
}
if (handle != null)
handle.mousePressed(e);
handler = handle;
}
if (handle != null && handler == handle)
handle.mouseDragged(e);
} finally {
// cell = null;
}
}
/**
* Invoked when the mouse pointer has been moved on a component (with no
* buttons down).
*/
public void mouseMoved(MouseEvent e) {
if (previousCursor == null)
previousCursor = graph.getCursor();
if (graph != null && graph.isEnabled()) {
if (marquee != null)
marquee.mouseMoved(e);
if (handle != null)
handle.mouseMoved(e);
if (!e.isConsumed() && previousCursor != null) {
graph.setCursor(previousCursor);
previousCursor = null;
}
}
}
// Event may be null when called to cancel the current operation.
public void mouseReleased(MouseEvent e) {
try {
if (e != null && !e.isConsumed()) {
if (handler == marquee && marquee != null)
marquee.mouseReleased(e);
else if (handler == handle && handle != null)
handle.mouseReleased(e);
if (isDescendant(cell, focus) && e.getModifiers() != 0) {
// Do not switch to parent if Special Selection
cell = focus;
}
if (!e.isConsumed() && cell != null) {
Object tmp = cell.getCell();
boolean wasSelected = graph.isCellSelected(tmp);
// if (!wasSelected || e.getModifiers() != 0)
selectCellForEvent(tmp, e);
focus = cell;
postProcessSelection(e, tmp, wasSelected);
}
}
} finally {
handler = null;
cell = null;
}
}
/**
* Invoked after a cell has been selected in the mouseReleased method.
* This can be used to do something interesting if the cell was already
* selected, in which case this implementation selects the parent.
* Override if you want different behaviour, such as start editing.
*/
protected void postProcessSelection(MouseEvent e, Object cell,
boolean wasSelected) {
if (wasSelected && graph.isCellSelected(cell)
&& e.getModifiers() != 0) {
Object parent = cell;
Object nextParent = null;
while (((nextParent = graphModel.getParent(parent)) != null)
&& graphLayoutCache.isVisible(nextParent))
parent = nextParent;
selectCellForEvent(parent, e);
focus = graphLayoutCache.getMapping(parent, false);
}
}
protected boolean isDescendant(CellView parentView, CellView childView) {
if (parentView == null || childView == null) {
return false;
}
Object parent = parentView.getCell();
Object child = childView.getCell();
Object ancestor = child;
do {
if (ancestor == parent)
return true;
} while ((ancestor = graphModel.getParent(ancestor)) != null);
return false;
}
} // End of BasicGraphUI.MouseHandler
public class RootHandle implements CellHandle, Serializable {
// x and y offset from the mouse press event to the left/top corner of a
// view that is returned by a findViewForPoint().
// These are used only when the isSnapSelectedView mode is enabled.
protected transient double _mouseToViewDelta_x = 0;
protected transient double _mouseToViewDelta_y = 0;
// Double Buffered
protected transient Image offscreen;
protected transient Graphics offgraphics;
protected transient boolean firstDrag = true;
/* Temporary views for the cells. */
protected transient CellView[] views;
protected transient CellView[] contextViews;
protected transient CellView[] portViews;
/* Bounds of the cells. Non-null if too many cells. */
protected transient Rectangle2D cachedBounds;
/* Initial top left corner of the selection */
protected transient Point2D initialLocation;
/* Child handles. Null if too many handles. */
protected transient CellHandle[] handles;
/* The point where the mouse was pressed. */
protected transient Point2D start = null, last, snapStart, snapLast;
/**
* Indicates whether this handle is currently moving cells. Start may be
* non-null and isMoving false while the minimum movement has not been
* reached.
*/
protected boolean isMoving = false;
/**
* Indicates whether this handle has started drag and drop. Note:
* isDragging => isMoving.
*/
protected boolean isDragging = false;
/** The handle that consumed the last mousePressedEvent. Initially null. */
protected transient CellHandle activeHandle = null;
/* The current selection context, responsible for cloning the cells. */
protected transient GraphContext context;
/*
* True after the graph was repainted to block xor-ed painting of
* background.
*/
protected boolean isContextVisible = true;
protected boolean blockPaint = false;
/* Defines the Disconnection if DisconnectOnMove is True */
protected transient ConnectionSet disconnect = null;
/**
* Creates a root handle which contains handles for the given cells. The
* root handle and all its childs point to the specified JGraph
* instance. The root handle is responsible for dragging the selection.
*/
public RootHandle(GraphContext ctx) {
this.context = ctx;
if (!ctx.isEmpty()) {
// Temporary cells
views = ctx.createTemporaryCellViews();
Rectangle2D tmpBounds = graph.toScreen(graph.getCellBounds(ctx
.getCells()));
if (ctx.getDescendantCount() < MAXCELLS) {
contextViews = ctx.createTemporaryContextViews();
initialLocation = graph.toScreen(getInitialLocation(ctx
.getCells()));
} else
cachedBounds = tmpBounds;
if (initialLocation == null)
initialLocation = new Point2D.Double(tmpBounds.getX(),
tmpBounds.getY());
// Sub-Handles
Object[] cells = ctx.getCells();
if (cells.length < MAXHANDLES) {
handles = new CellHandle[views.length];
for (int i = 0; i < views.length; i++)
handles[i] = views[i].getHandle(ctx);
// PortView Preview
portViews = ctx.createTemporaryPortViews();
}
}
}
/**
* Returns the initial location, which is the top left corner of the
* selection, ignoring all connected endpoints of edges.
*/
protected Point2D getInitialLocation(Object[] cells) {
if (cells != null && cells.length > 0) {
Rectangle2D ret = null;
for (int i = 0; i < cells.length; i++) {
if (graphModel.isEdge(cells[i])) {
CellView cellView = graphLayoutCache.getMapping(
cells[i], false);
if (cellView instanceof EdgeView) {
EdgeView edgeView = (EdgeView) cellView;
if (edgeView.getSource() == null) {
Point2D pt = edgeView.getPoint(0);
if (pt != null) {
if (ret == null)
ret = new Rectangle2D.Double(pt.getX(),
pt.getY(), 0, 0);
else
Rectangle2D.union(ret,
new Rectangle2D.Double(pt
.getX(), pt.getY(), 0,
0), ret);
}
}
if (edgeView.getTarget() == null) {
Point2D pt = edgeView.getPoint(edgeView
.getPointCount() - 1);
if (pt != null) {
if (ret == null)
ret = new Rectangle2D.Double(pt.getX(),
pt.getY(), 0, 0);
else
Rectangle2D.union(ret,
new Rectangle2D.Double(pt
.getX(), pt.getY(), 0,
0), ret);
}
}
}
} else {
Rectangle2D r = graph.getCellBounds(cells[i]);
if (r != null) {
if (ret == null)
ret = (Rectangle2D) r.clone();
Rectangle2D.union(ret, r, ret);
}
}
}
if (ret != null)
return new Point2D.Double(ret.getX(), ret.getY());
}
return null;
}
/* Returns the context of this root handle. */
public GraphContext getContext() {
return context;
}
/* Paint the handles. Use overlay to paint the current state. */
public void paint(Graphics g) {
if (handles != null && handles.length < MAXHANDLES)
for (int i = 0; i < handles.length; i++)
if (handles[i] != null)
handles[i].paint(g);
blockPaint = true;
}
public void overlay(Graphics g) {
if (isDragging && !DNDPREVIEW) // BUG IN 1.4.0 (FREEZE)
return;
if (cachedBounds != null) { // Paint Cached Bounds
g.setColor(Color.black);
g.drawRect((int) cachedBounds.getX(),
(int) cachedBounds.getY(), (int) cachedBounds
.getWidth() - 2,
(int) cachedBounds.getHeight() - 2);
} else {
Graphics2D g2 = (Graphics2D) g;
AffineTransform oldTransform = g2.getTransform();
g2.scale(graph.getScale(), graph.getScale());
if (views != null) { // Paint Temporary Views
for (int i = 0; i < views.length; i++)
paintCell(g, views[i], views[i].getBounds(), true);
}
// Paint temporary context
if (contextViews != null && isContextVisible) {
for (int i = 0; i < contextViews.length; i++)
paintCell(g, contextViews[i], contextViews[i]
.getBounds(), true);
}
if (!graph.isPortsScaled())
g2.setTransform(oldTransform);
if (portViews != null && graph.isPortsVisible())
paintPorts(g, portViews);
g2.setTransform(oldTransform);
}
}
/**
* Invoked when the mouse pointer has been moved on a component (with no
* buttons down).
*/
public void mouseMoved(MouseEvent event) {
if (!event.isConsumed() && handles != null) {
for (int i = handles.length - 1; i >= 0 && !event.isConsumed(); i--)
if (handles[i] != null)
handles[i].mouseMoved(event);
}
}
public void mousePressed(MouseEvent event) {
if (!event.isConsumed() && graph.isMoveable()) {
if (handles != null) { // Find Handle
for (int i = handles.length - 1; i >= 0; i--) {
if (handles[i] != null) {
handles[i].mousePressed(event);
if (event.isConsumed()) {
activeHandle = handles[i];
return;
}
}
}
}
if (views != null) { // Start Move if over cell
Point2D screenPoint = event.getPoint();
Point2D pt = graph
.fromScreen((Point2D) screenPoint.clone());
CellView view = findViewForPoint(pt);
if (view != null) {
if (snapSelectedView) {
Rectangle2D bounds = view.getBounds();
start = graph.toScreen(new Point2D.Double(bounds
.getX(), bounds.getY()));
snapStart = graph.snap((Point2D) start.clone());
_mouseToViewDelta_x = screenPoint.getX()
- start.getX();
_mouseToViewDelta_y = screenPoint.getY()
- start.getY();
} else { // this is the original RootHandle's mode.
snapStart = graph.snap((Point2D) screenPoint
.clone());
_mouseToViewDelta_x = snapStart.getX()
- screenPoint.getX();
_mouseToViewDelta_y = snapStart.getY()
- screenPoint.getY();
start = (Point2D) snapStart.clone();
}
last = (Point2D) start.clone();
snapLast = (Point2D) snapStart.clone();
isContextVisible = contextViews != null
&& contextViews.length < MAXCELLS
&& (!event.isControlDown() || !graph
.isCloneable());
event.consume();
}
}
}
}
/**
* Hook for subclassers to return a different view for a mouse click at
* <code>pt</code>. For example, this can be used to return a leaf
* cell instead of a group.
*/
protected CellView findViewForPoint(Point2D pt) {
double snap = graph.getTolerance();
Rectangle2D r = new Rectangle2D.Double(pt.getX() - snap, pt.getY()
- snap, 2 * snap, 2 * snap);
for (int i = 0; i < views.length; i++)
if (views[i].intersects(graph, r))
return views[i];
return null;
}
protected void startDragging(MouseEvent event) {
isDragging = true;
if (graph.isDragEnabled()) {
int action = (event.isControlDown() && graph.isCloneable()) ? TransferHandler.COPY
: TransferHandler.MOVE;
TransferHandler th = graph.getTransferHandler();
setInsertionLocation(event.getPoint());
try {
th.exportAsDrag(graph, event, action);
} catch (Exception ex) {
// Ignore
}
}
}
/**
* @return Returns the parent graph scrollpane for the specified graph.
*/
public Component getFirstOpaqueParent(Component component) {
if (component != null) {
Component parent = component;
while (parent != null) {
if (parent.isOpaque() && !(parent instanceof JViewport))
return parent;
parent = parent.getParent();
}
}
return component;
}
// Double Buffers by David Larsson
protected void initOffscreen() {
try {
Rectangle rect = graph.getBounds();
/*
* RepaintManager repMan = RepaintManager.currentManager(graph);
* offscreen = repMan.getVolatileOffscreenBuffer(graph, (int)
* rect.getWidth(), (int) rect.getHeight());
*/
offscreen = new BufferedImage(rect.width, rect.height,
BufferedImage.TYPE_INT_RGB);
offgraphics = offscreen.getGraphics();
offgraphics.setClip(0, 0, rect.width, rect.height);
/*
* Component comp = getFirstOpaqueParent(graph);
* offgraphics.translate(-rect.x, -rect.y);
* comp.paint(offgraphics); offgraphics.translate(rect.x,
* rect.y);
*/
offgraphics.setColor(graph.getBackground());
offgraphics.fillRect(0, 0, rect.width, rect.height);
graph.getUI().paint(offgraphics, graph);
} catch (Exception e) {
offscreen = null;
offgraphics = null;
} catch (Error e) {
offscreen = null;
offgraphics = null;
}
}
/** Process mouse dragged event. */
public void mouseDragged(MouseEvent event) {
boolean constrained = isConstrainedMoveEvent(event);
Rectangle2D dirty = null;
if (firstDrag && graph.isDoubleBuffered() && cachedBounds == null) {
initOffscreen();
firstDrag = false;
}
if (event != null && !event.isConsumed()) {
if (activeHandle != null) // Paint Active Handle
activeHandle.mouseDragged(event);
// Invoke Mouse Dragged
else if (start != null) { // Move Cells
Graphics g = (offgraphics != null) ? offgraphics : graph
.getGraphics();
Point ep = event.getPoint();
Point2D point = new Point2D.Double(ep.getX()
- _mouseToViewDelta_x, ep.getY()
- _mouseToViewDelta_y);
Point2D snapCurrent = graph.snap(point);
Point2D current = snapCurrent;
int thresh = graph.getMinimumMove();
double dx = current.getX() - start.getX();
double dy = current.getY() - start.getY();
if (isMoving || Math.abs(dx) > thresh
|| Math.abs(dy) > thresh) {
boolean overlayed = false;
isMoving = true;
if (disconnect == null && graph.isDisconnectOnMove())
disconnect = context.disconnect(graphLayoutCache
.getAllDescendants(views));
// Constrained movement
double totDx = current.getX() - start.getX();
double totDy = current.getY() - start.getY();
dx = current.getX() - last.getX();
dy = current.getY() - last.getY();
if (constrained && cachedBounds == null) {
if (Math.abs(totDx) < Math.abs(totDy)) {
dx = 0;
dy = totDy;
} else {
dx = totDx;
dy = 0;
}
} else if (!graph.isMoveBelowZero() && last != null
&& initialLocation != null && start != null) {
// TODO: remove?
if (initialLocation.getX() + totDx < 0)
dx = start.getX() - last.getX()
- initialLocation.getX();
if (initialLocation.getY() + totDy < 0)
dy = start.getY() - last.getY()
- initialLocation.getY();
}
double scale = graph.getScale();
dx = (int) (dx / scale);
// we don't want to round. The best thing is to get just
// the integer part.
// That way, the view won't "run away" from the mouse.
// It may lag behind
// a mouse pointer occasionally, but will be catching
// up.
dy = (int) (dy / scale);
g.setColor(graph.getForeground());
// use 'darker' to force XOR to distinguish between
// existing background elements during drag
// http://sourceforge.net/tracker/index.php?func=detail&aid=677743&group_id=43118&atid=435210
g.setXORMode(graph.getBackground().darker());
// Start Drag and Drop
if (graph.isDragEnabled() && !isDragging)
startDragging(event);
if (dx != 0 || dy != 0) {
if (!snapLast.equals(snapStart)
&& (offscreen != null || !blockPaint)) {
overlay(g);
overlayed = true;
}
isContextVisible = (!event.isControlDown() || !graph
.isCloneable())
&& contextViews != null
&& (contextViews.length < MAXCELLS);
blockPaint = false;
if (offscreen != null) {
dirty = graph.toScreen(AbstractCellView
.getBounds(views));
Rectangle2D t = graph.toScreen(AbstractCellView
.getBounds(contextViews));
if (t != null)
dirty.add(t);
}
if (constrained && cachedBounds == null) {
// Reset Initial Positions
CellView[] all = graphLayoutCache
.getAllDescendants(views);
for (int i = 0; i < all.length; i++) {
CellView orig = graphLayoutCache
.getMapping(all[i].getCell(), false);
AttributeMap attr = orig.getAllAttributes();
all[i].changeAttributes((AttributeMap) attr
.clone());
all[i].refresh(graph.getModel(), context,
false);
}
}
if (cachedBounds != null)
cachedBounds.setFrame(cachedBounds.getX() + dx
* scale, cachedBounds.getY() + dy
* scale, cachedBounds.getWidth(),
cachedBounds.getHeight());
else {
// Translate
GraphLayoutCache.translateViews(views, dx, dy);
if (views != null)
graphLayoutCache.update(views);
if (contextViews != null)
graphLayoutCache.update(contextViews);
}
if (!snapCurrent.equals(snapStart)) {
overlay(g);
overlayed = true;
}
if (constrained)
last = (Point2D) start.clone();
last.setLocation(last.getX() + dx * scale, last
.getY()
+ dy * scale);
// It is better to translate <code>last<code> by a
// scaled dx/dy
// instead of making it to be the
// <code>current<code> (as in prev version),
// so that the view would be catching up with a
// mouse pointer
snapLast = snapCurrent;
if (overlayed && offscreen != null) {
dirty.add(graph.toScreen(AbstractCellView
.getBounds(views)));
Rectangle2D t = graph.toScreen(AbstractCellView
.getBounds(contextViews));
if (t != null)
dirty.add(t);
// TODO: Should use real ports if portsVisible
// and check if ports are scaled
int border = PortView.SIZE + 4;
if (graph.isPortsScaled())
border = (int) (graph.getScale() * border);
int border2 = border / 2;
dirty.setFrame(dirty.getX() - border2, dirty
.getY()
- border2, dirty.getWidth() + border,
dirty.getHeight() + border);
double sx1 = Math.max(0, dirty.getX());
double sy1 = Math.max(0, dirty.getY());
double sx2 = sx1 + dirty.getWidth();
double sy2 = sy1 + dirty.getHeight();
if (isDragging && !DNDPREVIEW) // BUG IN 1.4.0
// (FREEZE)
return;
graph.getGraphics().drawImage(offscreen,
(int) sx1, (int) sy1, (int) sx2,
(int) sy2, (int) sx1, (int) sy1,
(int) sx2, (int) sy2, graph);
}
}
} // end if (isMoving or ...)
} // end if (start != null)
} else if (event == null)
graph.repaint();
}
public void mouseReleased(MouseEvent event) {
try {
if (event != null && !event.isConsumed()) {
if (activeHandle != null) {
activeHandle.mouseReleased(event);
activeHandle = null;
} else if (isMoving && !event.getPoint().equals(start)) {
if (cachedBounds != null) {
double dx = event.getX() - start.getX();
double dy = event.getY() - start.getY();
Point2D tmp = graph.fromScreen(new Point2D.Double(
dx, dy));
GraphLayoutCache.translateViews(views, tmp.getX(),
tmp.getY());
}
CellView[] all = graphLayoutCache
.getAllDescendants(views);
Map attributes = GraphConstants.createAttributes(all,
null);
if (event.isControlDown() && graph.isCloneable()) { // Clone
// Cells
Object[] cells = graph.getDescendants(graph
.order(context.getCells()));
// Include properties from hidden cells
Map hiddenMapping = graphLayoutCache
.getHiddenMapping();
for (int i = 0; i < cells.length; i++) {
Object witness = attributes.get(cells[i]);
if (witness == null) {
CellView view = (CellView) hiddenMapping
.get(cells[i]);
if (view != null
&& !graphModel.isPort(view
.getCell())) {
// TODO: Clone required? Same in
// GraphConstants.
AttributeMap attrs = (AttributeMap) view
.getAllAttributes().clone();
// Maybe translate?
// attrs.translate(dx, dy);
attributes.put(cells[i], attrs.clone());
}
}
}
ConnectionSet cs = ConnectionSet.create(graphModel,
cells, false);
ParentMap pm = ParentMap.create(graphModel, cells,
false, true);
cells = graphLayoutCache.insertClones(cells, graph
.cloneCells(cells), attributes, cs, pm, 0,
0);
} else if (graph.isMoveable()) { // Move Cells
// Execute on view
graph.getGraphLayoutCache().edit(attributes,
disconnect, null, null);
}
event.consume();
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
initialLocation = null;
isDragging = false;
disconnect = null;
offscreen = null;
firstDrag = true;
start = null;
}
}
}
/**
* PropertyChangeListener for the graph. Updates the appropriate variable
* and takes the appropriate actions, based on what changes.
*/
public class PropertyChangeHandler implements PropertyChangeListener,
Serializable {
public void propertyChange(PropertyChangeEvent event) {
if (event.getSource() == graph) {
String changeName = event.getPropertyName();
if (changeName.equals("minimumSize"))
updateCachedPreferredSize();
else if (changeName.equals(JGraph.GRAPH_MODEL_PROPERTY))
setModel((GraphModel) event.getNewValue());
else if (changeName.equals(JGraph.GRAPH_LAYOUT_CACHE_PROPERTY)) {
setGraphLayoutCache((GraphLayoutCache) event.getNewValue());
graph.repaint();
} else if (changeName.equals(JGraph.MARQUEE_HANDLER_PROPERTY))
setMarquee((BasicMarqueeHandler) event.getNewValue());
else if (changeName.equals("transferHandler")) {
if (dropTarget != null)
dropTarget
.removeDropTargetListener(defaultDropTargetListener);
dropTarget = graph.getDropTarget();
try {
if (dropTarget != null)
dropTarget
.addDropTargetListener(defaultDropTargetListener);
} catch (TooManyListenersException tmle) {
// should not happen... swing drop target is multicast
}
} else if (changeName.equals(JGraph.EDITABLE_PROPERTY)) {
boolean editable = ((Boolean) event.getNewValue())
.booleanValue();
if (!editable && isEditing(graph))
cancelEditing(graph);
} else if (changeName.equals(JGraph.SELECTION_MODEL_PROPERTY))
setSelectionModel(graph.getSelectionModel());
else if (changeName.equals(JGraph.GRID_VISIBLE_PROPERTY)
|| changeName.equals(JGraph.GRID_SIZE_PROPERTY)
|| changeName.equals(JGraph.PORTS_VISIBLE_PROPERTY)
|| changeName.equals(JGraph.ANTIALIASED_PROPERTY))
graph.repaint();
else if (changeName.equals(JGraph.SCALE_PROPERTY))
updateSize();
else if (changeName.equals("font")) {
completeEditing();
updateSize();
} else if (changeName.equals("componentOrientation")) {
if (graph != null)
graph.graphDidChange();
}
}
}
} // End of BasicGraphUI.PropertyChangeHandler
/**
* GraphIncrementAction is used to handle up/down actions.
*/
public class GraphIncrementAction extends AbstractAction {
/** Specifies the direction to adjust the selection by. */
protected int direction;
private GraphIncrementAction(int direction, String name) {
this.direction = direction;
}
public void actionPerformed(ActionEvent e) {
if (graph != null) {
int step = 70;
Rectangle rect = graph.getVisibleRect();
if (direction == 1)
rect.translate(0, -step); // up
else if (direction == 2)
rect.translate(step, 0); // right
else if (direction == 3)
rect.translate(0, step); // down
else if (direction == 4)
rect.translate(-step, 0); // left
graph.scrollRectToVisible(rect);
}
}
public boolean isEnabled() {
return (graph != null && graph.isEnabled());
}
} // End of class BasicGraphUI.GraphIncrementAction
/**
* ActionListener that invokes cancelEditing when action performed.
*/
private class GraphCancelEditingAction extends AbstractAction {
public GraphCancelEditingAction(String name) {
}
public void actionPerformed(ActionEvent e) {
if (graph != null)
cancelEditing(graph);
}
public boolean isEnabled() {
return (graph != null && graph.isEnabled());
}
} // End of class BasicGraphUI.GraphCancelEditingAction
/**
* ActionListener invoked to start editing on the focused cell.
*/
private class GraphEditAction extends AbstractAction {
public GraphEditAction(String name) {
}
public void actionPerformed(ActionEvent ae) {
if (isEnabled()) {
if (getFocusedCell() instanceof GraphCell) {
graph.startEditingAtCell(getFocusedCell());
}
}
}
public boolean isEnabled() {
return (graph != null && graph.isEnabled());
}
} // End of BasicGraphUI.GraphEditAction
/**
* Action to select everything in the graph.
*/
private class GraphSelectAllAction extends AbstractAction {
private boolean selectAll;
public GraphSelectAllAction(String name, boolean selectAll) {
this.selectAll = selectAll;
}
public void actionPerformed(ActionEvent ae) {
if (graph != null) {
if (selectAll) {
graph.setSelectionCells(graph.getGraphLayoutCache()
.getVisibleCells(graph.getRoots()));
} else
graph.clearSelection();
}
}
public boolean isEnabled() {
return (graph != null && graph.isEnabled());
}
} // End of BasicGraphUI.GraphSelectAllAction
/**
* MouseInputHandler handles passing all mouse events, including mouse
* motion events, until the mouse is released to the destination it is
* constructed with. It is assumed all the events are currently target at
* source.
*/
public class MouseInputHandler extends Object implements MouseInputListener {
/** Source that events are coming from. */
protected Component source;
/** Destination that receives all events. */
protected Component destination;
public MouseInputHandler(Component source, Component destination,
MouseEvent event) {
this.source = source;
this.destination = destination;
this.source.addMouseListener(this);
this.source.addMouseMotionListener(this);
/* Dispatch the editing event */
destination.dispatchEvent(SwingUtilities.convertMouseEvent(source,
event, destination));
}
public void mouseClicked(MouseEvent e) {
if (destination != null)
destination.dispatchEvent(SwingUtilities.convertMouseEvent(
source, e, destination));
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
if (destination != null)
destination.dispatchEvent(SwingUtilities.convertMouseEvent(
source, e, destination));
removeFromSource();
}
public void mouseEntered(MouseEvent e) {
if (!SwingUtilities.isLeftMouseButton(e)) {
removeFromSource();
}
}
public void mouseExited(MouseEvent e) {
if (!SwingUtilities.isLeftMouseButton(e)) {
removeFromSource();
}
// insertionLocation = null;
}
public void mouseDragged(MouseEvent e) {
if (destination != null)
destination.dispatchEvent(SwingUtilities.convertMouseEvent(
source, e, destination));
}
public void mouseMoved(MouseEvent e) {
removeFromSource();
}
protected void removeFromSource() {
if (source != null) {
source.removeMouseListener(this);
source.removeMouseMotionListener(this);
}
source = destination = null;
}
} // End of class BasicGraphUI.MouseInputHandler
/**
* Graph Drop Target Listener
*/
public class GraphDropTargetListener extends BasicGraphDropTargetListener
implements Serializable {
/**
* called to save the state of a component in case it needs to be
* restored because a drop is not performed.
*/
protected void saveComponentState(JComponent comp) {
}
/**
* called to restore the state of a component because a drop was not
* performed.
*/
protected void restoreComponentState(JComponent comp) {
if (handle != null)
handle.mouseDragged(null);
}
/**
* called to set the insertion location to match the current mouse
* pointer coordinates.
*/
protected void updateInsertionLocation(JComponent comp, Point p) {
setInsertionLocation(p);
if (handle != null) {
// How to fetch the shift state?
int mod = (dropAction == TransferHandler.COPY) ? InputEvent.CTRL_MASK
: 0;
handle.mouseDragged(new MouseEvent(comp, 0, 0, mod, p.x, p.y,
1, false));
}
}
public void dragEnter(DropTargetDragEvent e) {
dropAction = e.getDropAction();
super.dragEnter(e);
}
public void dropActionChanged(DropTargetDragEvent e) {
dropAction = e.getDropAction();
super.dropActionChanged(e);
}
} // End of BasicGraphUI.GraphDropTargetListener
/**
* @return true if snapSelectedView mode is enabled during the drag
* operation. If it is enabled, the view, that is returned by the
* findViewForPoint(Point pt), will be snapped to the grid lines.
* <br>
* By default, findViewForPoint() returns the first view from the
* GraphContext whose bounds intersect with snap proximity of a
* mouse pointer. If snap-to-grid mode is disabled, views are moved
* by a snap increment.
*/
public boolean isSnapSelectedView() {
return snapSelectedView;
}
/**
* Sets the mode of the snapSelectedView drag operation.
*
* @param snapSelectedView
* specifies if the snap-to-grid mode should be applied during a
* drag operation. If it is enabled, the view, that is returned
* by the findViewForPoint(Point pt), will be snapped to the grid
* lines. <br>
* By default, findViewForPoint() returns the first view from the
* GraphContext whose bounds intersect with snap proximity of a
* mouse pointer. If snap-to-grid mode is disabled, views are
* moved by a snap increment.
*/
public void setSnapSelectedView(boolean snapSelectedView) {
this.snapSelectedView = snapSelectedView;
}
} // End of class BasicGraphUI