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org.webswing.toolkit.extra.DndEventHandler Maven / Gradle / Ivy
package org.webswing.toolkit.extra;
import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Window;
import java.awt.datatransfer.Transferable;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import javax.swing.SwingUtilities;
import javax.swing.TransferHandler;
import org.webswing.toolkit.WebDragSourceContextPeer;
import org.webswing.toolkit.WebDropTargetContextPeer;
import org.webswing.toolkit.util.Logger;
import org.webswing.toolkit.util.Util;
@SuppressWarnings("restriction")
public class DndEventHandler {
private WebDropTargetContextPeer dropTarget;
private long[] formats;
private WebDragSourceContextPeer dragSource;
private int sourceActions;
private int lastDropTargetAction = 0;
private boolean dropped;
private boolean finished = true;
private Component enteredComponent;
private static Cursor cursor = Cursor.getDefaultCursor();
public void processMouseEvent(Window w, AWTEvent e) {
if (e instanceof MouseEvent) {
MouseEvent me = (MouseEvent) e;
int modifiers = (me.getModifiersEx() & (MouseEvent.CTRL_DOWN_MASK | MouseEvent.SHIFT_DOWN_MASK)) | MouseEvent.BUTTON1_DOWN_MASK;
int currentDropAction = WebDragSourceContextPeer.convertModifiersToDropAction(modifiers, sourceActions);
if(enteredComponent==w){
lastDropTargetAction = dropTarget.handleMotionMessage(w, me.getX(), me.getY(), currentDropAction, sourceActions, formats, 123123123);
}else{
lastDropTargetAction = dropTarget.handleEnterMessage(w, me.getX(), me.getY(), currentDropAction, sourceActions, formats, 123123123);
enteredComponent=w;
}
if (e.getID() == MouseEvent.MOUSE_RELEASED) {
//dragSource.dragMouseMoved(currentDropAction, modifiers, me.getXOnScreen(), me.getYOnScreen());
//dragSource.dragEnter(currentDropAction, modifiers, me.getXOnScreen(), me.getYOnScreen());
//dragSource.dragMotion(currentDropAction, modifiers, me.getXOnScreen(), me.getYOnScreen());
//lastDropTargetAction = dropTarget.handleMotionMessage(w, me.getX(), me.getY(), currentDropAction, sourceActions, formats, 123123123);
dragEnd(w, e, lastDropTargetAction != 0, lastDropTargetAction);
} else if (e.getID() == MouseEvent.MOUSE_DRAGGED) {
updateCursor();
String winId = Util.getPeerForTarget(w) == null ? null : Util.getPeerForTarget(w).getGuid();
Util.getWebToolkit().getPaintDispatcher().notifyCursorUpdate(cursor,null, winId);
}
} else if (e instanceof KeyEvent) {
if (e.getID() == KeyEvent.KEY_PRESSED && ((KeyEvent) e).getKeyCode() == KeyEvent.VK_ESCAPE) {
enteredComponent=null;
dragEnd(w, e, false, 0);
}
}
}
private void updateCursor() {
try {
switch (lastDropTargetAction) {
case TransferHandler.NONE:
cursor = Cursor.getSystemCustomCursor("Invalid.32x32");
break;
case TransferHandler.COPY:
cursor = Cursor.getSystemCustomCursor("CopyDrop.32x32");
break;
case TransferHandler.LINK:
cursor = Cursor.getSystemCustomCursor("LinkDrop.32x32");
break;
case TransferHandler.MOVE:
case TransferHandler.COPY_OR_MOVE:
default:
cursor = Cursor.getSystemCustomCursor("MoveDrop.32x32");
break;
}
} catch (Exception e) {
Logger.debug("Failed to load DnD cursor", e);
}
}
public void dragStart(WebDragSourceContextPeer dragSource, Transferable transferable, int actions, long[] formats) {
this.dragSource = dragSource;
this.formats = formats;
this.sourceActions = actions;
dropTarget = WebDropTargetContextPeer.getWebDropTargetContextPeer();
this.dropped = false;
this.finished = false;
this.enteredComponent=null;
}
private void dragEnd(Window w, AWTEvent e, boolean supported, int dropAction) {
if (!finished) {
if (e instanceof MouseEvent) {
MouseEvent me = ((MouseEvent) e);
if (w != null) {
if (supported && !dropped) {
dropTarget.setDragSource(dragSource);
dropTarget.handleDropMessage(w, me.getX(), me.getY(), lastDropTargetAction, this.sourceActions, formats, 123123123);
dropped = true;
} else {
dropTarget.handleExitMessage(w, 123123123);
dragSource.dragFinished(false, dropAction, me.getX(), me.getY());
}
}
} else {
dropTarget.handleExitMessage(w, 123123123);
dragSource.dragFinished(false, dropAction, 0, 0);
}
finished = true;
}
sourceActions = 0;
lastDropTargetAction = TransferHandler.NONE;
cursor = Cursor.getDefaultCursor();
}
public static Cursor getCurrentDropTargetCursorName() {
return cursor;
}
public boolean isDndInProgress() {
return !finished;
}
}
