Example usage for com.vaadin.client.ui.dd VAcceptCriterion accept

Introduction

In this page you can find the example usage for com.vaadin.client.ui.dd VAcceptCriterion accept.

Prototype

public void accept(final VDragEvent drag, UIDL configuration, final VAcceptCallback callback) 

Source Link

Document

Checks if current drag event has valid drop target and target accepts the transferable.

Usage

From source file:org.eclipse.hawkbit.ui.dd.client.criteria.ViewClientCriterion.java

License:Open Source License

@Override
// Exception squid:S1604 - GWT 2.7 does not support Java 8
@SuppressWarnings("squid:S1604")
public void accept(final VDragEvent drag, final UIDL configuration, final VAcceptCallback callback) {

    if (isDragStarting(drag)) {
        final NativePreviewHandler nativeEventHandler = new NativePreviewHandler() {
            @Override/*  w ww .j a  v a  2  s . c  om*/
            public void onPreviewNativeEvent(final NativePreviewEvent event) {
                if (isEscKey(event) || isMouseUp(event)) {
                    try {
                        hideDropTargetHints(configuration);
                    } finally {
                        nativeEventHandlerRegistration.removeHandler();
                    }
                }
            }
        };

        nativeEventHandlerRegistration = Event.addNativePreviewHandler(nativeEventHandler);
        setMultiRowDragDecoration(drag);
    }

    final int childCount = configuration.getChildCount();
    accepted = false;
    for (int childIndex = 0; childIndex < childCount; childIndex++) {
        final VAcceptCriterion crit = getCriteria(configuration, childIndex);
        crit.accept(drag, configuration.getChildUIDL(childIndex), this);
        if (Boolean.TRUE.equals(accepted)) {
            callback.accepted(drag);
            return;
        }
    }

    // if no VAcceptCriterion accepts and the mouse is release, an error
    // message is shown
    if (Event.ONMOUSEUP == Event.getTypeInt(drag.getCurrentGwtEvent().getType())) {
        showErrorNotification(drag);
    }

    errorMessage = configuration.getStringAttribute(ERROR_MESSAGE);
}

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