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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package sun.awt.X11;

import java.awt.Component;
import java.awt.peer.ComponentPeer;

import java.io.IOException;

import java.util.Iterator;

import sun.awt.AWTAccessor;
import sun.util.logging.PlatformLogger;

import sun.awt.AppContext;
import sun.awt.SunToolkit;

import sun.awt.dnd.SunDropTargetContextPeer;
import sun.awt.dnd.SunDropTargetEvent;

import jdk.internal.misc.Unsafe;

The XDropTargetContextPeer is the class responsible for handling the interaction between the XDnD/Motif DnD subsystem and Java drop targets.
Since:1.5
/** * The XDropTargetContextPeer is the class responsible for handling * the interaction between the XDnD/Motif DnD subsystem and Java drop targets. * * @since 1.5 */
final class XDropTargetContextPeer extends SunDropTargetContextPeer { private static final PlatformLogger logger = PlatformLogger.getLogger("sun.awt.X11.xembed.xdnd.XDropTargetContextPeer"); private static final Unsafe unsafe = XlibWrapper.unsafe; /* * A key to store a peer instance for an AppContext. */ private static final Object DTCP_KEY = "DropTargetContextPeer"; private XDropTargetContextPeer() {} static XDropTargetContextPeer getPeer(AppContext appContext) { synchronized (_globalLock) { XDropTargetContextPeer peer = (XDropTargetContextPeer)appContext.get(DTCP_KEY); if (peer == null) { peer = new XDropTargetContextPeer(); appContext.put(DTCP_KEY, peer); } return peer; } } static XDropTargetProtocolListener getXDropTargetProtocolListener() { return XDropTargetProtocolListenerImpl.getInstance(); } /* * @param returnValue the drop action selected by the Java drop target. */ protected void eventProcessed(SunDropTargetEvent e, int returnValue, boolean dispatcherDone) { /* The native context is the pointer to the XClientMessageEvent structure. */ long ctxt = getNativeDragContext(); /* If the event was not consumed, send a response to the source. */ try { if (ctxt != 0 && !e.isConsumed()) { Iterator<XDropTargetProtocol> dropTargetProtocols = XDragAndDropProtocols.getDropTargetProtocols(); while (dropTargetProtocols.hasNext()) { XDropTargetProtocol dropTargetProtocol = dropTargetProtocols.next(); if (dropTargetProtocol.sendResponse(ctxt, e.getID(), returnValue)) { break; } } } } finally { if (dispatcherDone && ctxt != 0) { unsafe.freeMemory(ctxt); } } } protected void doDropDone(boolean success, int dropAction, boolean isLocal) { /* The native context is the pointer to the XClientMessageEvent structure. */ long ctxt = getNativeDragContext(); if (ctxt != 0) { try { Iterator<XDropTargetProtocol> dropTargetProtocols = XDragAndDropProtocols.getDropTargetProtocols(); while (dropTargetProtocols.hasNext()) { XDropTargetProtocol dropTargetProtocol = dropTargetProtocols.next(); if (dropTargetProtocol.sendDropDone(ctxt, success, dropAction)) { break; } } } finally { unsafe.freeMemory(ctxt); } } } protected Object getNativeData(long format) throws IOException { /* The native context is the pointer to the XClientMessageEvent structure. */ long ctxt = getNativeDragContext(); if (ctxt != 0) { Iterator<XDropTargetProtocol> dropTargetProtocols = XDragAndDropProtocols.getDropTargetProtocols(); while (dropTargetProtocols.hasNext()) { XDropTargetProtocol dropTargetProtocol = dropTargetProtocols.next(); // getData throws IAE if ctxt is not for this protocol. try { return dropTargetProtocol.getData(ctxt, format); } catch (IllegalArgumentException iae) { } } } return null; } private void cleanup() { } protected void processEnterMessage(SunDropTargetEvent event) { if (!processSunDropTargetEvent(event)) { super.processEnterMessage(event); } } protected void processExitMessage(SunDropTargetEvent event) { if (!processSunDropTargetEvent(event)) { super.processExitMessage(event); } } protected void processMotionMessage(SunDropTargetEvent event, boolean operationChanged) { if (!processSunDropTargetEvent(event)) { super.processMotionMessage(event, operationChanged); } } protected void processDropMessage(SunDropTargetEvent event) { if (!processSunDropTargetEvent(event)) { super.processDropMessage(event); } } // If source is an XEmbedCanvasPeer, passes the event to it for processing and // return true if the event is forwarded to the XEmbed child. // Otherwise, does nothing and return false. private boolean processSunDropTargetEvent(SunDropTargetEvent event) { Object source = event.getSource(); if (source instanceof Component) { Object peer = AWTAccessor.getComponentAccessor() .getPeer((Component) source); if (peer instanceof XEmbedCanvasPeer) { XEmbedCanvasPeer xEmbedCanvasPeer = (XEmbedCanvasPeer)peer; /* The native context is the pointer to the XClientMessageEvent structure. */ long ctxt = getNativeDragContext(); if (logger.isLoggable(PlatformLogger.Level.FINER)) { logger.finer(" processing " + event + " ctxt=" + ctxt + " consumed=" + event.isConsumed()); } /* If the event is not consumed, pass it to the XEmbedCanvasPeer for processing. */ if (!event.isConsumed()) { // NOTE: ctxt can be zero at this point. if (xEmbedCanvasPeer.processXEmbedDnDEvent(ctxt, event.getID())) { event.consume(); return true; } } } } return false; } public void forwardEventToEmbedded(long embedded, long ctxt, int eventID) { Iterator<XDropTargetProtocol> dropTargetProtocols = XDragAndDropProtocols.getDropTargetProtocols(); while (dropTargetProtocols.hasNext()) { XDropTargetProtocol dropTargetProtocol = dropTargetProtocols.next(); if (dropTargetProtocol.forwardEventToEmbedded(embedded, ctxt, eventID)) { break; } } } static final class XDropTargetProtocolListenerImpl implements XDropTargetProtocolListener { private static final XDropTargetProtocolListener theInstance = new XDropTargetProtocolListenerImpl(); private XDropTargetProtocolListenerImpl() {} static XDropTargetProtocolListener getInstance() { return theInstance; } public void handleDropTargetNotification(XWindow xwindow, int x, int y, int dropAction, int actions, long[] formats, long nativeCtxt, int eventID) { Object target = xwindow.getTarget(); // The Every component is associated with some AppContext. assert target instanceof Component; Component component = (Component)target; AppContext appContext = SunToolkit.targetToAppContext(target); // Every component is associated with some AppContext. assert appContext != null; XDropTargetContextPeer peer = XDropTargetContextPeer.getPeer(appContext); peer.postDropTargetEvent(component, x, y, dropAction, actions, formats, nativeCtxt, eventID, !SunDropTargetContextPeer.DISPATCH_SYNC); } } }