com.vaadin.event.dd.acceptcriteria.ContainsDataFlavor Maven / Gradle / Ivy
/*
* Vaadin Framework 7
*
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
/**
*
*/
package com.vaadin.event.dd.acceptcriteria;
import com.vaadin.event.Transferable;
import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.server.PaintException;
import com.vaadin.server.PaintTarget;
/**
* A Criterion that checks whether {@link Transferable} contains given data
* flavor. The developer might for example accept the incoming data only if it
* contains "Url" or "Text".
*
* @since 6.3
*/
public class ContainsDataFlavor extends ClientSideCriterion {
private String dataFlavorId;
/**
* Constructs a new instance of {@link ContainsDataFlavor}.
*
* @param dataFlawor
* the type of data that will be checked from
* {@link Transferable}
*/
public ContainsDataFlavor(String dataFlawor) {
dataFlavorId = dataFlawor;
}
@Override
public void paintContent(PaintTarget target) throws PaintException {
super.paintContent(target);
target.addAttribute("p", dataFlavorId);
}
@Override
public boolean accept(DragAndDropEvent dragEvent) {
return dragEvent.getTransferable().getDataFlavors()
.contains(dataFlavorId);
}
@Override
protected String getIdentifier() {
// extending classes use client side implementation from this class
return ContainsDataFlavor.class.getCanonicalName();
}
}