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package com.vaadin.ui;
import java.util.Map;
import com.vaadin.event.ComponentTransferable;
import com.vaadin.event.DataBindedTransferable;
import com.vaadin.event.Transferable;
import com.vaadin.event.dd.DropEvent;
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.AcceptAll;
import com.vaadin.event.dd.acceptCriteria.AcceptCriterion;
import com.vaadin.terminal.PaintException;
import com.vaadin.terminal.PaintTarget;
import com.vaadin.terminal.gwt.client.MouseEventDetails;
/**
* Test class that implements various component related Drag and Drop features.
*
* TODO consider implementing this kind of general purpose layout class:
*
* - extend simple component (CssLayout or CustomComponent, instead of absolute
* layout)
*
* - implement both drag source and drop handler with server side api
*
* - implement html5 drop target etc
*
* - include a lots of details for drop event (coordinates & sizes of drop
* position and widget/Paintable hierarchy up to drop handler)
*
* This way we could have one rather complex dd component that could be used (by
* wrapping layouts) in most common situations with server side api. Core
* layouts wouldn't need changes (and have regression risk/ performance
* penalty).
*
*/
@SuppressWarnings("serial")
@ClientWidget(com.vaadin.terminal.gwt.client.ui.VDragDropPane.class)
public class DragDropPane extends AbsoluteLayout implements DropTarget {
private DropHandler dropHandler;
public DragDropPane(DropHandler dropHandler) {
setWidth("400px");
setHeight("300px");
if (dropHandler == null) {
this.dropHandler = new ImportPrettyMuchAnything();
} else {
this.dropHandler = dropHandler;
}
}
public DragDropPane() {
this(null);
}
@Override
public void paintContent(PaintTarget target) throws PaintException {
super.paintContent(target);
dropHandler.getAcceptCriterion().paint(target);
}
public DropHandler getDropHandler() {
return dropHandler;
}
public static class ImportPrettyMuchAnything implements DropHandler {
public void drop(DropEvent event) {
DragDropPane pane = (DragDropPane) event.getDropTargetData()
.getTarget();
DragEventDetails ed = (DragEventDetails) event.getDropTargetData();
Transferable transferable = event.getTransferable();
if (transferable instanceof ComponentTransferable) {
ComponentTransferable ctr = (ComponentTransferable) transferable;
Component component = ctr.getSourceComponent();
if (component.getParent() != pane) {
if (transferable instanceof DataBindedTransferable) {
// Item has been dragged, construct a Label from
// Item id
Label l = new Label();
l.setSizeUndefined();
l.setValue("ItemId : "
+ ((DataBindedTransferable) transferable)
.getItemId());
pane.addComponent(l);
component = l;
} else {
// we have a component that is been dragged, add
// it
// to
// this
pane.addComponent(component);
}
Integer left = ed.getAbsoluteLeft();
Integer top = ed.getAbsoluteTop();
MouseEventDetails eventDetails = ed.getMouseEvent();
int clientX = eventDetails.getClientX();
int clientY = eventDetails.getClientY();
try {
pane.getPosition(component).setTopValue(clientY - top);
pane.getPosition(component)
.setLeftValue(clientX - left);
} catch (Exception e) {
// TODO: handle exception
}
} else {
// drag ended inside the this Pane
MouseEventDetails start = ed.getMouseDownEvent();
MouseEventDetails eventDetails = ed.getMouseEvent();
int deltaX = eventDetails.getClientX() - start.getClientX();
int deltaY = eventDetails.getClientY() - start.getClientY();
ComponentPosition p = pane.getPosition(component);
p.setTopValue(p.getTopValue() + deltaY);
p.setLeftValue(p.getLeftValue() + deltaX);
}
} else {
// drag coming outside of Vaadin
String object = (String) transferable.getData("text/plain");
String content = (String) transferable.getData("fileContents");
Label l = new Label();
l.setCaption("Generated from HTML5 drag:");
if (object != null) {
l.setValue(object);
} else {
l.setValue("HTML5 dd");
}
l.setDescription(content);
l.setSizeUndefined();
pane.addComponent(l);
}
return;
}
public AcceptCriterion getAcceptCriterion() {
return AcceptAll.get();
}
}
class DragEventDetails extends TargetDetailsImpl {
public DragEventDetails(Map<String, Object> rawVariables) {
super(rawVariables);
}
public Integer getAbsoluteTop() {
return (Integer) getData("absoluteTop");
}
public Integer getAbsoluteLeft() {
return (Integer) getData("absoluteLeft");
}
public MouseEventDetails getMouseDownEvent() {
return MouseEventDetails.deSerialize((String) getData("mouseDown"));
}
public MouseEventDetails getMouseEvent() {
return MouseEventDetails
.deSerialize((String) getData("mouseEvent"));
}
}
public TargetDetails translateDragDropDetails(
Map<String, Object> clientVariables) {
return new DragEventDetails(clientVariables);
}
public void setDropHandler(DropHandler dropHandler2) {
dropHandler = dropHandler2;
requestRepaint();
}
}
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