gwtquery.plugins.draggable.client.impl.DraggableHandlerImpl.java Source code

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Here is the source code for gwtquery.plugins.draggable.client.impl.DraggableHandlerImpl.java

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/*
 * Copyright 2010 The gwtquery plugins team.
 *
 * 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 gwtquery.plugins.draggable.client.impl;

import com.google.gwt.dom.client.Element;
import com.google.gwt.query.client.GQuery;
import com.google.gwt.query.client.GQuery.Offset;
import com.google.gwt.query.client.plugins.UiPlugin;

import gwtquery.plugins.draggable.client.DraggableHandler;
import gwtquery.plugins.draggable.client.DraggableOptions.HelperType;

import static com.google.gwt.query.client.GQuery.$;

/**
 * @author Julien Dramaix (julien.dramaix@gmail.com, @jdramaix)
 */
public class DraggableHandlerImpl {

    public boolean resetParentOffsetPosition(GQuery helperOffsetParent) {
        return helperOffsetParent.get(0) == GQuery.body;
    }

    public int[] calculateContainment(DraggableHandler draggableHandler, Offset containerOffset,
            Element containerElement, boolean overflow) {

        Offset helperMargin = draggableHandler.getMargin();
        UiPlugin.Dimension helperDimension = draggableHandler.getHelperDimension();

        return new int[] {
                containerOffset.left + (int) $(containerElement).cur("borderLeftWidth", true)
                        + (int) $(containerElement).cur("paddingLeft", true) - helperMargin.left,
                containerOffset.top + (int) $(containerElement).cur("borderTopWidth", true)
                        + (int) $(containerElement).cur("paddingTop", true) - helperMargin.top,
                containerOffset.left
                        + (overflow ? Math.max(containerElement.getScrollWidth(), containerElement.getOffsetWidth())
                                : containerElement.getOffsetWidth())
                        - (int) $(containerElement).cur("borderLeftWidth", true)
                        - (int) $(containerElement).cur("paddingRight", true) - helperDimension.getWidth()
                        - helperMargin.left,
                containerOffset.top
                        + (overflow
                                ? Math.max(containerElement.getScrollHeight(), containerElement.getOffsetHeight())
                                : containerElement.getOffsetHeight())
                        - (int) $(containerElement).cur("borderTopWidth", true)
                        - (int) $(containerElement).cur("paddingBottom", true) - helperDimension.getHeight()
                        - helperMargin.top };
    }

    public void removeHelper(GQuery helper, HelperType helperType) {
        helper.remove();
    }

    public Offset calculateRelativeHelperOffset(Element element, DraggableHandler draggableHandler) {

        Offset position = new Offset(element.getOffsetLeft(), element.getOffsetTop());
        Element helperElement = draggableHandler.getHelper().get(0);
        Offset margin = draggableHandler.getMargin();

        Offset helperCssPosition = getCssPosition(helperElement);
        int top = position.top - helperCssPosition.top - margin.top;
        int left = position.left - helperCssPosition.left - margin.left;

        return new Offset(left, top);

    }

    public Offset getCssPosition(Element e) {
        int top = 0;
        int left = 0;
        if (e.getStyle().getTop() != null && e.getStyle().getTop().length() > 0) {
            top = (int) $(e).cur("top", true);
        }
        //same remark
        if (e.getStyle().getLeft() != null && e.getStyle().getLeft().length() > 0) {
            left = (int) $(e).cur("left", true);
        }
        return new Offset(left, top);
    }

}