Example usage for com.google.gwt.dom.client NativeEvent getDataTransfer

Introduction

In this page you can find the example usage for com.google.gwt.dom.client NativeEvent getDataTransfer.

Prototype

public final native DataTransfer getDataTransfer() ;

Source Link

Document

Get the DataTransfer associated with the current drag event.

Usage

From source file:com.vaadin.client.extensions.DragSourceExtensionConnector.java

License:Apache License

/**
 * Event handler for the {@code dragstart} event. Called when {@code
 * dragstart} event occurs.// w ww . j  a v  a 2s.  c  om
 *
 * @param event
 *         browser event to be handled
 */
protected void onDragStart(Event event) {
    // Convert elemental event to have access to dataTransfer
    NativeEvent nativeEvent = (NativeEvent) event;

    // Set effectAllowed parameter
    if (getState().effectAllowed != null) {
        setEffectAllowed(nativeEvent.getDataTransfer(), getState().effectAllowed.getValue());
    }

    // Set data parameter
    List<String> types = getState().types;
    Map<String, String> data = getState().data;
    for (String format : types) {
        nativeEvent.getDataTransfer().setData(format, data.get(format));
    }

    // Store the extension's connector ID in DataTransfer.data
    nativeEvent.getDataTransfer().setData(DATA_TYPE_DRAG_SOURCE_ID, getConnectorId());

    // Initiate firing server side dragstart event when there is a
    // DragStartListener attached on the server side
    if (hasEventListener(DragSourceState.EVENT_DRAGSTART)) {
        getRpcProxy(DragSourceRpc.class).dragStart();
    }
}

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From source file:com.vaadin.client.extensions.DropTargetExtensionConnector.java

License:Apache License

/**
 * Event handler for the {@code dragover} event.
 *
 * @param event/*from w ww. j  a  va 2s.  com*/
 *         browser event to be handled
 */
protected void onDragOver(Event event) {
    NativeEvent nativeEvent = (NativeEvent) event;
    if (isDragOverAllowed(nativeEvent)) {
        // Set dropEffect parameter
        if (getState().dropEffect != null) {
            nativeEvent.getDataTransfer()
                    .setDropEffect(DataTransfer.DropEffect.valueOf(getState().dropEffect.name()));
        }

        // Prevent default to allow drop
        nativeEvent.preventDefault();
        nativeEvent.stopPropagation();
    } else {
        // Remove drop effect
        nativeEvent.getDataTransfer().setDropEffect(DataTransfer.DropEffect.NONE);

        // Remove drop target indicator
        removeTargetIndicator(getDropTargetElement());
    }
}

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From source file:com.vaadin.client.extensions.DropTargetExtensionConnector.java

License:Apache License

/**
 * Event handler for the {@code drop} event.
 *
 * @param event//from ww w  .ja  v  a2s.  c  o m
 *         browser event to be handled
 */
protected void onDrop(Event event) {
    NativeEvent nativeEvent = (NativeEvent) event;
    if (dropAllowed(nativeEvent)) {
        nativeEvent.preventDefault();
        nativeEvent.stopPropagation();

        // Initiate firing server side drop event
        JsArrayString typesJsArray = getTypes(nativeEvent.getDataTransfer());
        List<String> types = new ArrayList<>();
        Map<String, String> data = new HashMap<>();
        for (int i = 0; i < typesJsArray.length(); i++) {
            types.add(typesJsArray.get(i));
            data.put(typesJsArray.get(i), nativeEvent.getDataTransfer().getData(typesJsArray.get(i)));
        }

        getRpcProxy(DropTargetRpc.class).drop(types, data, getState().dropEffect,
                data.get(DragSourceExtensionConnector.DATA_TYPE_DRAG_SOURCE_ID));
    }

    removeTargetIndicator(getDropTargetElement());
}

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