com.allen_sauer.gwt.dnd.client.drop.AbstractDropController.java Source code

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Here is the source code for com.allen_sauer.gwt.dnd.client.drop.AbstractDropController.java

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/*
 * Copyright 2009 Fred Sauer
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.allen_sauer.gwt.dnd.client.drop;

import com.google.gwt.user.client.ui.Widget;

import com.allen_sauer.gwt.dnd.client.DragContext;
import com.allen_sauer.gwt.dnd.client.VetoDragException;
import com.allen_sauer.gwt.dnd.client.util.DOMUtil;
import com.allen_sauer.gwt.dnd.client.util.DragClientBundle;

/**
 * Base class for typical drop controllers. Contains some basic functionality like adjust widget
 * styles.
 */
public abstract class AbstractDropController implements DropController {
    // CHECKSTYLE_JAVADOC_OFF

    /**
     * The drop target.
     */
    private Widget dropTarget;

    public AbstractDropController(Widget dropTarget) {
        this.dropTarget = dropTarget;
        dropTarget.addStyleName(DragClientBundle.INSTANCE.css().dropTarget());
    }

    @Override
    public Widget getDropTarget() {
        return dropTarget;
    }

    boolean isRtl() {
        return DOMUtil.isRtl(dropTarget);
    }

    @Override
    public void onDrop(DragContext context) {
    }

    @Override
    public void onEnter(DragContext context) {
        dropTarget.addStyleName(DragClientBundle.INSTANCE.css().dropTargetEngage());
    }

    @Override
    public void onLeave(DragContext context) {
        dropTarget.removeStyleName(DragClientBundle.INSTANCE.css().dropTargetEngage());
    }

    @Override
    public void onMove(DragContext context) {
    }

    @Override
    public void onPreviewDrop(DragContext context) throws VetoDragException {
    }
}