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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.server;
import java.io.PrintWriter;
import java.util.Map;
import java.util.logging.Logger;
import com.vaadin.event.Transferable;
import com.vaadin.event.TransferableImpl;
import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.event.dd.DragSource;
import com.vaadin.event.dd.DropHandler;
import com.vaadin.event.dd.DropTarget;
import com.vaadin.event.dd.TargetDetails;
import com.vaadin.event.dd.TargetDetailsImpl;
import com.vaadin.event.dd.acceptcriteria.AcceptCriterion;
import com.vaadin.terminal.PaintException;
import com.vaadin.terminal.VariableOwner;
import com.vaadin.terminal.gwt.client.ui.dd.VDragAndDropManager.DragEventType;
import com.vaadin.ui.Component;
public class DragAndDropService implements VariableOwner {
private static final Logger logger = Logger
.getLogger(DragAndDropService.class.getName());
private int lastVisitId;
private boolean lastVisitAccepted = false;
private DragAndDropEvent dragEvent;
private final AbstractCommunicationManager manager;
private AcceptCriterion acceptCriterion;
public DragAndDropService(AbstractCommunicationManager manager) {
this.manager = manager;
}
public void changeVariables(Object source, Map<String, Object> variables) {
Object owner = variables.get("dhowner");
// Validate drop handler owner
if (!(owner instanceof DropTarget)) {
logger.severe("DropHandler owner " + owner
+ " must implement DropTarget");
return;
}
// owner cannot be null here
DropTarget dropTarget = (DropTarget) owner;
lastVisitId = (Integer) variables.get("visitId");
// request may be dropRequest or request during drag operation (commonly
// dragover or dragenter)
boolean dropRequest = isDropRequest(variables);
if (dropRequest) {
handleDropRequest(dropTarget, variables);
} else {
handleDragRequest(dropTarget, variables);
}
}
/**
* Handles a drop request from the VDragAndDropManager.
*
* @param dropTarget
* @param variables
*/
private void handleDropRequest(DropTarget dropTarget,
Map<String, Object> variables) {
DropHandler dropHandler = (dropTarget).getDropHandler();
if (dropHandler == null) {
// No dropHandler returned so no drop can be performed.
logger.fine("DropTarget.getDropHandler() returned null for owner: "
+ dropTarget);
return;
}
/*
* Construct the Transferable and the DragDropDetails for the drop
* operation based on the info passed from the client widgets (drag
* source for Transferable, drop target for DragDropDetails).
*/
Transferable transferable = constructTransferable(dropTarget, variables);
TargetDetails dropData = constructDragDropDetails(dropTarget, variables);
DragAndDropEvent dropEvent = new DragAndDropEvent(transferable,
dropData);
if (dropHandler.getAcceptCriterion().accept(dropEvent)) {
dropHandler.drop(dropEvent);
}
}
/**
* Handles a drag/move request from the VDragAndDropManager.
*
* @param dropTarget
* @param variables
*/
private void handleDragRequest(DropTarget dropTarget,
Map<String, Object> variables) {
lastVisitId = (Integer) variables.get("visitId");
acceptCriterion = dropTarget.getDropHandler().getAcceptCriterion();
/*
* Construct the Transferable and the DragDropDetails for the drag
* operation based on the info passed from the client widgets (drag
* source for Transferable, current target for DragDropDetails).
*/
Transferable transferable = constructTransferable(dropTarget, variables);
TargetDetails dragDropDetails = constructDragDropDetails(dropTarget,
variables);
dragEvent = new DragAndDropEvent(transferable, dragDropDetails);
lastVisitAccepted = acceptCriterion.accept(dragEvent);
}
/**
* Construct DragDropDetails based on variables from client drop target.
* Uses DragDropDetailsTranslator if available, otherwise a default
* DragDropDetails implementation is used.
*
* @param dropTarget
* @param variables
* @return
*/
@SuppressWarnings("unchecked")
private TargetDetails constructDragDropDetails(DropTarget dropTarget,
Map<String, Object> variables) {
Map<String, Object> rawDragDropDetails = (Map<String, Object>) variables
.get("evt");
TargetDetails dropData = dropTarget
.translateDropTargetDetails(rawDragDropDetails);
if (dropData == null) {
// Create a default DragDropDetails with all the raw variables
dropData = new TargetDetailsImpl(rawDragDropDetails, dropTarget);
}
return dropData;
}
private boolean isDropRequest(Map<String, Object> variables) {
return getRequestType(variables) == DragEventType.DROP;
}
private DragEventType getRequestType(Map<String, Object> variables) {
int type = (Integer) variables.get("type");
return DragEventType.values()[type];
}
@SuppressWarnings("unchecked")
private Transferable constructTransferable(DropTarget dropHandlerOwner,
Map<String, Object> variables) {
final Component sourceComponent = (Component) variables
.get("component");
variables = (Map<String, Object>) variables.get("tra");
Transferable transferable = null;
if (sourceComponent != null && sourceComponent instanceof DragSource) {
transferable = ((DragSource) sourceComponent)
.getTransferable(variables);
}
if (transferable == null) {
transferable = new TransferableImpl(sourceComponent, variables);
}
return transferable;
}
public boolean isEnabled() {
return true;
}
public boolean isImmediate() {
return true;
}
void printJSONResponse(PrintWriter outWriter) throws PaintException {
if (isDirty()) {
outWriter.print(", \"dd\":");
JsonPaintTarget jsonPaintTarget = new JsonPaintTarget(manager,
outWriter, false);
jsonPaintTarget.startTag("dd");
jsonPaintTarget.addAttribute("visitId", lastVisitId);
if (acceptCriterion != null) {
jsonPaintTarget.addAttribute("accepted", lastVisitAccepted);
acceptCriterion.paintResponse(jsonPaintTarget);
}
jsonPaintTarget.endTag("dd");
jsonPaintTarget.close();
lastVisitId = -1;
lastVisitAccepted = false;
acceptCriterion = null;
dragEvent = null;
}
}
private boolean isDirty() {
if (lastVisitId > 0) {
return true;
}
return false;
}
}
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