| /* |
| * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.awt.dnd; |
| |
| import java.util.TooManyListenersException; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| |
| import java.awt.Component; |
| import java.awt.Dimension; |
| import java.awt.GraphicsEnvironment; |
| import java.awt.HeadlessException; |
| import java.awt.Insets; |
| import java.awt.Point; |
| import java.awt.Rectangle; |
| import java.awt.Toolkit; |
| import java.awt.event.ActionEvent; |
| import java.awt.event.ActionListener; |
| import java.awt.datatransfer.FlavorMap; |
| import java.awt.datatransfer.SystemFlavorMap; |
| import javax.swing.Timer; |
| import java.awt.peer.ComponentPeer; |
| import java.awt.peer.LightweightPeer; |
| import java.awt.dnd.peer.DropTargetPeer; |
| |
| import sun.awt.AWTAccessor; |
| import sun.awt.AWTAccessor.ComponentAccessor; |
| |
| |
| /** |
| * The {@code DropTarget} is associated |
| * with a {@code Component} when that {@code Component} |
| * wishes |
| * to accept drops during Drag and Drop operations. |
| * <P> |
| * Each |
| * {@code DropTarget} is associated with a {@code FlavorMap}. |
| * The default {@code FlavorMap} hereafter designates the |
| * {@code FlavorMap} returned by {@code SystemFlavorMap.getDefaultFlavorMap()}. |
| * |
| * @since 1.2 |
| */ |
| |
| public class DropTarget implements DropTargetListener, Serializable { |
| |
| private static final long serialVersionUID = -6283860791671019047L; |
| |
| /** |
| * Creates a new DropTarget given the {@code Component} |
| * to associate itself with, an {@code int} representing |
| * the default acceptable action(s) to |
| * support, a {@code DropTargetListener} |
| * to handle event processing, a {@code boolean} indicating |
| * if the {@code DropTarget} is currently accepting drops, and |
| * a {@code FlavorMap} to use (or null for the default {@code FlavorMap}). |
| * <P> |
| * The Component will receive drops only if it is enabled. |
| * @param c The {@code Component} with which this {@code DropTarget} is associated |
| * @param ops The default acceptable actions for this {@code DropTarget} |
| * @param dtl The {@code DropTargetListener} for this {@code DropTarget} |
| * @param act Is the {@code DropTarget} accepting drops. |
| * @param fm The {@code FlavorMap} to use, or null for the default {@code FlavorMap} |
| * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| * returns true |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public DropTarget(Component c, int ops, DropTargetListener dtl, |
| boolean act, FlavorMap fm) |
| throws HeadlessException |
| { |
| if (GraphicsEnvironment.isHeadless()) { |
| throw new HeadlessException(); |
| } |
| |
| component = c; |
| |
| setDefaultActions(ops); |
| |
| if (dtl != null) try { |
| addDropTargetListener(dtl); |
| } catch (TooManyListenersException tmle) { |
| // do nothing! |
| } |
| |
| if (c != null) { |
| c.setDropTarget(this); |
| setActive(act); |
| } |
| |
| if (fm != null) { |
| flavorMap = fm; |
| } else { |
| flavorMap = SystemFlavorMap.getDefaultFlavorMap(); |
| } |
| } |
| |
| /** |
| * Creates a {@code DropTarget} given the {@code Component} |
| * to associate itself with, an {@code int} representing |
| * the default acceptable action(s) |
| * to support, a {@code DropTargetListener} |
| * to handle event processing, and a {@code boolean} indicating |
| * if the {@code DropTarget} is currently accepting drops. |
| * <P> |
| * The Component will receive drops only if it is enabled. |
| * @param c The {@code Component} with which this {@code DropTarget} is associated |
| * @param ops The default acceptable actions for this {@code DropTarget} |
| * @param dtl The {@code DropTargetListener} for this {@code DropTarget} |
| * @param act Is the {@code DropTarget} accepting drops. |
| * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| * returns true |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public DropTarget(Component c, int ops, DropTargetListener dtl, |
| boolean act) |
| throws HeadlessException |
| { |
| this(c, ops, dtl, act, null); |
| } |
| |
| /** |
| * Creates a {@code DropTarget}. |
| * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| * returns true |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public DropTarget() throws HeadlessException { |
| this(null, DnDConstants.ACTION_COPY_OR_MOVE, null, true, null); |
| } |
| |
| /** |
| * Creates a {@code DropTarget} given the {@code Component} |
| * to associate itself with, and the {@code DropTargetListener} |
| * to handle event processing. |
| * <P> |
| * The Component will receive drops only if it is enabled. |
| * @param c The {@code Component} with which this {@code DropTarget} is associated |
| * @param dtl The {@code DropTargetListener} for this {@code DropTarget} |
| * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| * returns true |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public DropTarget(Component c, DropTargetListener dtl) |
| throws HeadlessException |
| { |
| this(c, DnDConstants.ACTION_COPY_OR_MOVE, dtl, true, null); |
| } |
| |
| /** |
| * Creates a {@code DropTarget} given the {@code Component} |
| * to associate itself with, an {@code int} representing |
| * the default acceptable action(s) to support, and a |
| * {@code DropTargetListener} to handle event processing. |
| * <P> |
| * The Component will receive drops only if it is enabled. |
| * @param c The {@code Component} with which this {@code DropTarget} is associated |
| * @param ops The default acceptable actions for this {@code DropTarget} |
| * @param dtl The {@code DropTargetListener} for this {@code DropTarget} |
| * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| * returns true |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public DropTarget(Component c, int ops, DropTargetListener dtl) |
| throws HeadlessException |
| { |
| this(c, ops, dtl, true); |
| } |
| |
| /** |
| * Note: this interface is required to permit the safe association |
| * of a DropTarget with a Component in one of two ways, either: |
| * {@code component.setDropTarget(droptarget);} |
| * or {@code droptarget.setComponent(component);} |
| * <P> |
| * The Component will receive drops only if it is enabled. |
| * @param c The new {@code Component} this {@code DropTarget} |
| * is to be associated with. |
| */ |
| |
| public synchronized void setComponent(Component c) { |
| if (component == c || component != null && component.equals(c)) |
| return; |
| |
| final Component old = component; |
| |
| if (old != null) { |
| clearAutoscroll(); |
| |
| component = null; |
| removeNotify(); |
| old.setDropTarget(null); |
| |
| } |
| |
| if ((component = c) != null) try { |
| c.setDropTarget(this); |
| } catch (Exception e) { // undo the change |
| if (old != null) { |
| old.setDropTarget(this); |
| addNotify(); |
| } |
| } |
| } |
| |
| /** |
| * Gets the {@code Component} associated |
| * with this {@code DropTarget}. |
| * |
| * @return the current {@code Component} |
| */ |
| |
| public synchronized Component getComponent() { |
| return component; |
| } |
| |
| /** |
| * Sets the default acceptable actions for this {@code DropTarget} |
| * |
| * @param ops the default actions |
| * @see java.awt.dnd.DnDConstants |
| */ |
| |
| public void setDefaultActions(int ops) { |
| getDropTargetContext().setTargetActions(ops & (DnDConstants.ACTION_COPY_OR_MOVE | DnDConstants.ACTION_REFERENCE)); |
| } |
| |
| /* |
| * Called by DropTargetContext.setTargetActions() |
| * with appropriate synchronization. |
| */ |
| void doSetDefaultActions(int ops) { |
| actions = ops; |
| } |
| |
| /** |
| * Gets an {@code int} representing the |
| * current action(s) supported by this {@code DropTarget}. |
| * |
| * @return the current default actions |
| */ |
| |
| public int getDefaultActions() { |
| return actions; |
| } |
| |
| /** |
| * Sets the DropTarget active if {@code true}, |
| * inactive if {@code false}. |
| * |
| * @param isActive sets the {@code DropTarget} (in)active. |
| */ |
| |
| public synchronized void setActive(boolean isActive) { |
| if (isActive != active) { |
| active = isActive; |
| } |
| |
| if (!active) clearAutoscroll(); |
| } |
| |
| /** |
| * Reports whether or not |
| * this {@code DropTarget} |
| * is currently active (ready to accept drops). |
| * |
| * @return {@code true} if active, {@code false} if not |
| */ |
| |
| public boolean isActive() { |
| return active; |
| } |
| |
| /** |
| * Adds a new {@code DropTargetListener} (UNICAST SOURCE). |
| * |
| * @param dtl The new {@code DropTargetListener} |
| * |
| * @throws TooManyListenersException if a |
| * {@code DropTargetListener} is already added to this |
| * {@code DropTarget}. |
| */ |
| |
| public synchronized void addDropTargetListener(DropTargetListener dtl) throws TooManyListenersException { |
| if (dtl == null) return; |
| |
| if (equals(dtl)) throw new IllegalArgumentException("DropTarget may not be its own Listener"); |
| |
| if (dtListener == null) |
| dtListener = dtl; |
| else |
| throw new TooManyListenersException(); |
| } |
| |
| /** |
| * Removes the current {@code DropTargetListener} (UNICAST SOURCE). |
| * |
| * @param dtl the DropTargetListener to deregister. |
| */ |
| |
| public synchronized void removeDropTargetListener(DropTargetListener dtl) { |
| if (dtl != null && dtListener != null) { |
| if(dtListener.equals(dtl)) |
| dtListener = null; |
| else |
| throw new IllegalArgumentException("listener mismatch"); |
| } |
| } |
| |
| /** |
| * Calls {@code dragEnter} on the registered |
| * {@code DropTargetListener} and passes it |
| * the specified {@code DropTargetDragEvent}. |
| * Has no effect if this {@code DropTarget} |
| * is not active. |
| * |
| * @param dtde the {@code DropTargetDragEvent} |
| * |
| * @throws NullPointerException if this {@code DropTarget} |
| * is active and {@code dtde} is {@code null} |
| * |
| * @see #isActive |
| */ |
| public synchronized void dragEnter(DropTargetDragEvent dtde) { |
| isDraggingInside = true; |
| |
| if (!active) return; |
| |
| if (dtListener != null) { |
| dtListener.dragEnter(dtde); |
| } else |
| dtde.getDropTargetContext().setTargetActions(DnDConstants.ACTION_NONE); |
| |
| initializeAutoscrolling(dtde.getLocation()); |
| } |
| |
| /** |
| * Calls {@code dragOver} on the registered |
| * {@code DropTargetListener} and passes it |
| * the specified {@code DropTargetDragEvent}. |
| * Has no effect if this {@code DropTarget} |
| * is not active. |
| * |
| * @param dtde the {@code DropTargetDragEvent} |
| * |
| * @throws NullPointerException if this {@code DropTarget} |
| * is active and {@code dtde} is {@code null} |
| * |
| * @see #isActive |
| */ |
| public synchronized void dragOver(DropTargetDragEvent dtde) { |
| if (!active) return; |
| |
| if (dtListener != null && active) dtListener.dragOver(dtde); |
| |
| updateAutoscroll(dtde.getLocation()); |
| } |
| |
| /** |
| * Calls {@code dropActionChanged} on the registered |
| * {@code DropTargetListener} and passes it |
| * the specified {@code DropTargetDragEvent}. |
| * Has no effect if this {@code DropTarget} |
| * is not active. |
| * |
| * @param dtde the {@code DropTargetDragEvent} |
| * |
| * @throws NullPointerException if this {@code DropTarget} |
| * is active and {@code dtde} is {@code null} |
| * |
| * @see #isActive |
| */ |
| public synchronized void dropActionChanged(DropTargetDragEvent dtde) { |
| if (!active) return; |
| |
| if (dtListener != null) dtListener.dropActionChanged(dtde); |
| |
| updateAutoscroll(dtde.getLocation()); |
| } |
| |
| /** |
| * Calls {@code dragExit} on the registered |
| * {@code DropTargetListener} and passes it |
| * the specified {@code DropTargetEvent}. |
| * Has no effect if this {@code DropTarget} |
| * is not active. |
| * <p> |
| * This method itself does not throw any exception |
| * for null parameter but for exceptions thrown by |
| * the respective method of the listener. |
| * |
| * @param dte the {@code DropTargetEvent} |
| * |
| * @see #isActive |
| */ |
| public synchronized void dragExit(DropTargetEvent dte) { |
| isDraggingInside = false; |
| |
| if (!active) return; |
| |
| if (dtListener != null && active) dtListener.dragExit(dte); |
| |
| clearAutoscroll(); |
| } |
| |
| /** |
| * Calls {@code drop} on the registered |
| * {@code DropTargetListener} and passes it |
| * the specified {@code DropTargetDropEvent} |
| * if this {@code DropTarget} is active. |
| * |
| * @param dtde the {@code DropTargetDropEvent} |
| * |
| * @throws NullPointerException if {@code dtde} is null |
| * and at least one of the following is true: this |
| * {@code DropTarget} is not active, or there is |
| * no a {@code DropTargetListener} registered. |
| * |
| * @see #isActive |
| */ |
| public synchronized void drop(DropTargetDropEvent dtde) { |
| isDraggingInside = false; |
| |
| clearAutoscroll(); |
| |
| if (dtListener != null && active) |
| dtListener.drop(dtde); |
| else { // we shouldn't get here ... |
| dtde.rejectDrop(); |
| } |
| } |
| |
| /** |
| * Gets the {@code FlavorMap} |
| * associated with this {@code DropTarget}. |
| * If no {@code FlavorMap} has been set for this |
| * {@code DropTarget}, it is associated with the default |
| * {@code FlavorMap}. |
| * |
| * @return the FlavorMap for this DropTarget |
| */ |
| |
| public FlavorMap getFlavorMap() { return flavorMap; } |
| |
| /** |
| * Sets the {@code FlavorMap} associated |
| * with this {@code DropTarget}. |
| * |
| * @param fm the new {@code FlavorMap}, or null to |
| * associate the default FlavorMap with this DropTarget. |
| */ |
| |
| public void setFlavorMap(FlavorMap fm) { |
| flavorMap = fm == null ? SystemFlavorMap.getDefaultFlavorMap() : fm; |
| } |
| |
| /** |
| * Notify the DropTarget that it has been associated with a Component |
| * |
| ********************************************************************** |
| * This method is usually called from java.awt.Component.addNotify() of |
| * the Component associated with this DropTarget to notify the DropTarget |
| * that a ComponentPeer has been associated with that Component. |
| * |
| * Calling this method, other than to notify this DropTarget of the |
| * association of the ComponentPeer with the Component may result in |
| * a malfunction of the DnD system. |
| ********************************************************************** |
| */ |
| public void addNotify() { |
| final ComponentAccessor acc = AWTAccessor.getComponentAccessor(); |
| ComponentPeer peer = acc.getPeer(component); |
| if (peer == null || peer == componentPeer) { |
| return; |
| } |
| |
| componentPeer = peer; |
| |
| |
| for (Component c = component; |
| c != null && peer instanceof LightweightPeer; c = c.getParent()) { |
| peer = acc.getPeer(c); |
| } |
| |
| if (peer instanceof DropTargetPeer) { |
| nativePeer = (DropTargetPeer) peer; |
| ((DropTargetPeer)peer).addDropTarget(this); |
| } else { |
| nativePeer = null; |
| } |
| } |
| |
| /** |
| * Notify the DropTarget that it has been disassociated from a Component |
| * |
| ********************************************************************** |
| * This method is usually called from java.awt.Component.removeNotify() of |
| * the Component associated with this DropTarget to notify the DropTarget |
| * that a ComponentPeer has been disassociated with that Component. |
| * |
| * Calling this method, other than to notify this DropTarget of the |
| * disassociation of the ComponentPeer from the Component may result in |
| * a malfunction of the DnD system. |
| ********************************************************************** |
| */ |
| |
| public void removeNotify() { |
| if (nativePeer != null) { |
| nativePeer.removeDropTarget(this); |
| } |
| componentPeer = null; |
| nativePeer = null; |
| |
| synchronized (this) { |
| if (isDraggingInside) { |
| dragExit(new DropTargetEvent(getDropTargetContext())); |
| } |
| } |
| } |
| |
| /** |
| * Gets the {@code DropTargetContext} associated |
| * with this {@code DropTarget}. |
| * |
| * @return the {@code DropTargetContext} associated with this {@code DropTarget}. |
| */ |
| |
| public DropTargetContext getDropTargetContext() { |
| return dropTargetContext; |
| } |
| |
| /** |
| * Creates the DropTargetContext associated with this DropTarget. |
| * Subclasses may override this method to instantiate their own |
| * DropTargetContext subclass. |
| * |
| * This call is typically *only* called by the platform's |
| * DropTargetContextPeer as a drag operation encounters this |
| * DropTarget. Accessing the Context while no Drag is current |
| * has undefined results. |
| * @return the DropTargetContext associated with this DropTarget |
| */ |
| |
| protected DropTargetContext createDropTargetContext() { |
| return new DropTargetContext(this); |
| } |
| |
| /** |
| * Serializes this {@code DropTarget}. Performs default serialization, |
| * and then writes out this object's {@code DropTargetListener} if and |
| * only if it can be serialized. If not, {@code null} is written |
| * instead. |
| * |
| * @serialData The default serializable fields, in alphabetical order, |
| * followed by either a {@code DropTargetListener} |
| * instance, or {@code null}. |
| * @since 1.4 |
| */ |
| private void writeObject(ObjectOutputStream s) throws IOException { |
| s.defaultWriteObject(); |
| |
| s.writeObject(SerializationTester.test(dtListener) |
| ? dtListener : null); |
| } |
| |
| /** |
| * Deserializes this {@code DropTarget}. This method first performs |
| * default deserialization for all non-{@code transient} fields. An |
| * attempt is then made to deserialize this object's |
| * {@code DropTargetListener} as well. This is first attempted by |
| * deserializing the field {@code dtListener}, because, in releases |
| * prior to 1.4, a non-{@code transient} field of this name stored the |
| * {@code DropTargetListener}. If this fails, the next object in the |
| * stream is used instead. |
| * |
| * @since 1.4 |
| */ |
| private void readObject(ObjectInputStream s) |
| throws ClassNotFoundException, IOException |
| { |
| ObjectInputStream.GetField f = s.readFields(); |
| |
| try { |
| dropTargetContext = |
| (DropTargetContext)f.get("dropTargetContext", null); |
| } catch (IllegalArgumentException e) { |
| // Pre-1.4 support. 'dropTargetContext' was previously transient |
| } |
| if (dropTargetContext == null) { |
| dropTargetContext = createDropTargetContext(); |
| } |
| |
| component = (Component)f.get("component", null); |
| actions = f.get("actions", DnDConstants.ACTION_COPY_OR_MOVE); |
| active = f.get("active", true); |
| |
| // Pre-1.4 support. 'dtListener' was previously non-transient |
| try { |
| dtListener = (DropTargetListener)f.get("dtListener", null); |
| } catch (IllegalArgumentException e) { |
| // 1.4-compatible byte stream. 'dtListener' was written explicitly |
| dtListener = (DropTargetListener)s.readObject(); |
| } |
| } |
| |
| /*********************************************************************/ |
| |
| /** |
| * this protected nested class implements autoscrolling |
| */ |
| |
| protected static class DropTargetAutoScroller implements ActionListener { |
| |
| /** |
| * construct a DropTargetAutoScroller |
| * |
| * @param c the {@code Component} |
| * @param p the {@code Point} |
| */ |
| |
| protected DropTargetAutoScroller(Component c, Point p) { |
| super(); |
| |
| component = c; |
| autoScroll = (Autoscroll)component; |
| |
| Toolkit t = Toolkit.getDefaultToolkit(); |
| |
| Integer initial = Integer.valueOf(100); |
| Integer interval = Integer.valueOf(100); |
| |
| try { |
| initial = (Integer)t.getDesktopProperty("DnD.Autoscroll.initialDelay"); |
| } catch (Exception e) { |
| // ignore |
| } |
| |
| try { |
| interval = (Integer)t.getDesktopProperty("DnD.Autoscroll.interval"); |
| } catch (Exception e) { |
| // ignore |
| } |
| |
| timer = new Timer(interval.intValue(), this); |
| |
| timer.setCoalesce(true); |
| timer.setInitialDelay(initial.intValue()); |
| |
| locn = p; |
| prev = p; |
| |
| try { |
| hysteresis = ((Integer)t.getDesktopProperty("DnD.Autoscroll.cursorHysteresis")).intValue(); |
| } catch (Exception e) { |
| // ignore |
| } |
| |
| timer.start(); |
| } |
| |
| /** |
| * update the geometry of the autoscroll region |
| */ |
| |
| @SuppressWarnings("deprecation") |
| private void updateRegion() { |
| Insets i = autoScroll.getAutoscrollInsets(); |
| Dimension size = component.getSize(); |
| |
| if (size.width != outer.width || size.height != outer.height) |
| outer.reshape(0, 0, size.width, size.height); |
| |
| if (inner.x != i.left || inner.y != i.top) |
| inner.setLocation(i.left, i.top); |
| |
| int newWidth = size.width - (i.left + i.right); |
| int newHeight = size.height - (i.top + i.bottom); |
| |
| if (newWidth != inner.width || newHeight != inner.height) |
| inner.setSize(newWidth, newHeight); |
| |
| } |
| |
| /** |
| * cause autoscroll to occur |
| * |
| * @param newLocn the {@code Point} |
| */ |
| |
| protected synchronized void updateLocation(Point newLocn) { |
| prev = locn; |
| locn = newLocn; |
| |
| if (Math.abs(locn.x - prev.x) > hysteresis || |
| Math.abs(locn.y - prev.y) > hysteresis) { |
| if (timer.isRunning()) timer.stop(); |
| } else { |
| if (!timer.isRunning()) timer.start(); |
| } |
| } |
| |
| /** |
| * cause autoscrolling to stop |
| */ |
| |
| protected void stop() { timer.stop(); } |
| |
| /** |
| * cause autoscroll to occur |
| * |
| * @param e the {@code ActionEvent} |
| */ |
| |
| public synchronized void actionPerformed(ActionEvent e) { |
| updateRegion(); |
| |
| if (outer.contains(locn) && !inner.contains(locn)) |
| autoScroll.autoscroll(locn); |
| } |
| |
| /* |
| * fields |
| */ |
| |
| private Component component; |
| private Autoscroll autoScroll; |
| |
| private Timer timer; |
| |
| private Point locn; |
| private Point prev; |
| |
| private Rectangle outer = new Rectangle(); |
| private Rectangle inner = new Rectangle(); |
| |
| private int hysteresis = 10; |
| } |
| |
| /*********************************************************************/ |
| |
| /** |
| * create an embedded autoscroller |
| * |
| * @param c the {@code Component} |
| * @param p the {@code Point} |
| * @return an embedded autoscroller |
| */ |
| |
| protected DropTargetAutoScroller createDropTargetAutoScroller(Component c, Point p) { |
| return new DropTargetAutoScroller(c, p); |
| } |
| |
| /** |
| * initialize autoscrolling |
| * |
| * @param p the {@code Point} |
| */ |
| |
| protected void initializeAutoscrolling(Point p) { |
| if (component == null || !(component instanceof Autoscroll)) return; |
| |
| autoScroller = createDropTargetAutoScroller(component, p); |
| } |
| |
| /** |
| * update autoscrolling with current cursor location |
| * |
| * @param dragCursorLocn the {@code Point} |
| */ |
| |
| protected void updateAutoscroll(Point dragCursorLocn) { |
| if (autoScroller != null) autoScroller.updateLocation(dragCursorLocn); |
| } |
| |
| /** |
| * clear autoscrolling |
| */ |
| |
| protected void clearAutoscroll() { |
| if (autoScroller != null) { |
| autoScroller.stop(); |
| autoScroller = null; |
| } |
| } |
| |
| /** |
| * The DropTargetContext associated with this DropTarget. |
| * |
| * @serial |
| */ |
| private DropTargetContext dropTargetContext = createDropTargetContext(); |
| |
| /** |
| * The Component associated with this DropTarget. |
| * |
| * @serial |
| */ |
| private Component component; |
| |
| /* |
| * That Component's Peer |
| */ |
| private transient ComponentPeer componentPeer; |
| |
| /* |
| * That Component's "native" Peer |
| */ |
| private transient DropTargetPeer nativePeer; |
| |
| |
| /** |
| * Default permissible actions supported by this DropTarget. |
| * |
| * @see #setDefaultActions |
| * @see #getDefaultActions |
| * @serial |
| */ |
| int actions = DnDConstants.ACTION_COPY_OR_MOVE; |
| |
| /** |
| * {@code true} if the DropTarget is accepting Drag & Drop operations. |
| * |
| * @serial |
| */ |
| boolean active = true; |
| |
| /* |
| * the auto scrolling object |
| */ |
| |
| private transient DropTargetAutoScroller autoScroller; |
| |
| /* |
| * The delegate |
| */ |
| |
| private transient DropTargetListener dtListener; |
| |
| /* |
| * The FlavorMap |
| */ |
| |
| private transient FlavorMap flavorMap; |
| |
| /* |
| * If the dragging is currently inside this drop target |
| */ |
| private transient boolean isDraggingInside; |
| } |
