com.haulmont.cuba.web.widgets.addons.dragdroplayouts.drophandlers.DefaultAbsoluteLayoutDropHandler.java Source code

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Here is the source code for com.haulmont.cuba.web.widgets.addons.dragdroplayouts.drophandlers.DefaultAbsoluteLayoutDropHandler.java

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/*
 * Copyright 2015 John Ahlroos
 * 
 * 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.haulmont.cuba.web.widgets.addons.dragdroplayouts.drophandlers;

import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.server.Sizeable;
import com.vaadin.ui.AbsoluteLayout;
import com.vaadin.ui.AbsoluteLayout.ComponentPosition;
import com.vaadin.ui.Component;
import com.vaadin.ui.ComponentContainer;
import com.vaadin.ui.SingleComponentContainer;

import com.haulmont.cuba.web.widgets.addons.dragdroplayouts.DDAbsoluteLayout;
import com.haulmont.cuba.web.widgets.addons.dragdroplayouts.details.AbsoluteLayoutTargetDetails;
import com.haulmont.cuba.web.widgets.addons.dragdroplayouts.events.LayoutBoundTransferable;

/**
 * A default drop handler for absolute layouts
 * 
 * @author John Ahlroos / www.jasoft.fi
 * @since 0.4.0
 */
@SuppressWarnings("serial")
public class DefaultAbsoluteLayoutDropHandler extends AbstractDefaultLayoutDropHandler {

    /**
     * Called when a component changed location within the layout
     * 
     * @param event
     *            The drag and drop event
     */
    @Override
    protected void handleComponentReordering(DragAndDropEvent event) {
        AbsoluteLayoutTargetDetails details = (AbsoluteLayoutTargetDetails) event.getTargetDetails();
        DDAbsoluteLayout layout = (DDAbsoluteLayout) details.getTarget();
        LayoutBoundTransferable transferable = (LayoutBoundTransferable) event.getTransferable();
        Component component = transferable.getComponent();

        // Get top-left pixel position
        int leftPixelPosition = details.getRelativeLeft();
        int topPixelPosition = details.getRelativeTop();

        ComponentPosition position = layout.getPosition(component);

        position.setLeft((float) leftPixelPosition, Sizeable.UNITS_PIXELS);
        position.setTop((float) topPixelPosition, Sizeable.UNITS_PIXELS);
    }

    /**
     * Handle a drop from another layout
     * 
     * @param event
     *            The drag and drop event
     */
    @Override
    protected void handleDropFromLayout(DragAndDropEvent event) {
        AbsoluteLayoutTargetDetails details = (AbsoluteLayoutTargetDetails) event.getTargetDetails();
        LayoutBoundTransferable transferable = (LayoutBoundTransferable) event.getTransferable();
        Component component = transferable.getComponent();
        Component source = event.getTransferable().getSourceComponent();
        DDAbsoluteLayout layout = (DDAbsoluteLayout) details.getTarget();
        int leftPixelPosition = details.getRelativeLeft();
        int topPixelPosition = details.getRelativeTop();

        // Check that we are not dragging an outer layout into an
        // inner
        // layout
        Component parent = source.getParent();
        while (parent != null) {
            parent = parent.getParent();
        }

        // remove component from source
        if (source instanceof ComponentContainer) {
            ((ComponentContainer) source).removeComponent(component);
        } else if (source instanceof SingleComponentContainer) {
            ((SingleComponentContainer) source).setContent(null);
        }

        // Add component to absolute layout
        layout.addComponent(component, "left:" + leftPixelPosition + "px;top:" + topPixelPosition + "px");
    }

    @Override
    protected void handleHTML5Drop(DragAndDropEvent event) {
        AbsoluteLayoutTargetDetails details = (AbsoluteLayoutTargetDetails) event.getTargetDetails();
        DDAbsoluteLayout layout = (DDAbsoluteLayout) details.getTarget();

        int leftPixelPosition = details.getRelativeLeft();
        int topPixelPosition = details.getRelativeTop();
        layout.addComponent(resolveComponentFromHTML5Drop(event),
                "left:" + leftPixelPosition + "px;top:" + topPixelPosition + "px");

    }

    @Override
    public Class<AbsoluteLayout> getTargetLayoutType() {
        return AbsoluteLayout.class;
    }
}