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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.client.ui.dd;
import com.vaadin.terminal.gwt.client.UIDL;
public abstract class VAcceptCriterion {
/**
* Checks if current drag event has valid drop target and target accepts the
* transferable. If drop target is valid, callback is used.
*
* @param drag
* @param configuration
* @param callback
*/
public void accept(final VDragEvent drag, UIDL configuration,
final VAcceptCallback callback) {
if (needsServerSideCheck(drag, configuration)) {
VDragEventServerCallback acceptCallback = new VDragEventServerCallback() {
public void handleResponse(boolean accepted, UIDL response) {
if (accepted) {
callback.accepted(drag);
}
}
};
VDragAndDropManager.get().visitServer(acceptCallback);
} else {
boolean validates = accept(drag, configuration);
if (validates) {
callback.accepted(drag);
}
}
}
protected abstract boolean accept(VDragEvent drag, UIDL configuration);
public boolean needsServerSideCheck(VDragEvent drag, UIDL criterioUIDL) {
return false;
}
}
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