com.foc.vaadin.gui.layouts.FVAbsoulte_WYSIWYG_DropHandler.java Source code

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Here is the source code for com.foc.vaadin.gui.layouts.FVAbsoulte_WYSIWYG_DropHandler.java

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/*******************************************************************************
 * Copyright 2016 Antoine Nicolas SAMAHA
 * 
 * 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.foc.vaadin.gui.layouts;

import org.xml.sax.helpers.AttributesImpl;

import com.foc.Globals;
import com.foc.vaadin.gui.FocXMLGuiComponent;
import com.foc.vaadin.gui.xmlForm.FXML;
import com.foc.vaadin.gui.xmlForm.FocXMLAttributes;
import com.vaadin.event.DataBoundTransferable;
import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.event.dd.DropTarget;
import com.vaadin.ui.AbsoluteLayout.ComponentPosition;
import com.vaadin.ui.Component;
import com.vaadin.ui.ComponentContainer;
import com.vaadin.ui.HasComponents;

import fi.jasoft.dragdroplayouts.DDAbsoluteLayout;
import fi.jasoft.dragdroplayouts.details.AbsoluteLayoutTargetDetails;
import fi.jasoft.dragdroplayouts.events.LayoutBoundTransferable;

@SuppressWarnings("serial")
public class FVAbsoulte_WYSIWYG_DropHandler extends FVDropHandler {

    public FVAbsoulte_WYSIWYG_DropHandler(FVLayout layout) {
        super(layout);
    }

    /**
     * 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, com.vaadin.server.Sizeable.Unit.PIXELS);
        position.setTop((float) topPixelPosition, com.vaadin.server.Sizeable.Unit.PIXELS);

        AttributesImpl newAttributes = new AttributesImpl(((FocXMLGuiComponent) component).getAttributes());
        newAttributes.setValue(newAttributes.getIndex(FXML.ATT_LEFT), leftPixelPosition + "px");
        newAttributes.setValue(newAttributes.getIndex(FXML.ATT_TOP), topPixelPosition + "px");
        ((FocXMLGuiComponent) component).setAttributes(newAttributes);

        if (component instanceof FVLayout) {
            ((FVLayout) component).setDragDrop(true);
        }
    }

    /**
     * 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();
        }

        ComponentContainer sourceLayout = null;

        // remove component from source
        if (source instanceof ComponentContainer) {
            sourceLayout = (ComponentContainer) source;
            sourceLayout.removeComponent(component);
        }

        AttributesImpl newAttributes = removeNotNeededAttributes(((FocXMLGuiComponent) component).getAttributes(),
                (FVLayout) sourceLayout);

        if (newAttributes.getIndex(FXML.ATT_LEFT) != -1) {
            newAttributes.setValue(newAttributes.getIndex(FXML.ATT_LEFT), leftPixelPosition + "px");
        } else {
            newAttributes.addAttribute("", FXML.ATT_LEFT, FXML.ATT_LEFT, "CDATA", leftPixelPosition + "px");
        }

        if (newAttributes.getIndex(FXML.ATT_TOP) != -1) {
            newAttributes.setValue(newAttributes.getIndex(FXML.ATT_TOP), topPixelPosition + "px");
        } else {
            newAttributes.addAttribute("", FXML.ATT_TOP, FXML.ATT_TOP, "CDATA", topPixelPosition + "px");
        }

        ((FocXMLGuiComponent) component).setAttributes(newAttributes);

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

    public void drop(DragAndDropEvent event) {
        AbsoluteLayoutTargetDetails details = (AbsoluteLayoutTargetDetails) event.getTargetDetails();
        DropTarget layout = details.getTarget();
        Component source = event.getTransferable().getSourceComponent();

        if (layout == source) {
            Globals.logString("Here in");
            handleComponentReordering(event);
        } else if (event.getTransferable() instanceof LayoutBoundTransferable) {
            LayoutBoundTransferable transferable = (LayoutBoundTransferable) event.getTransferable();
            Component comp = transferable.getComponent();

            if (comp == layout) {
                if (comp.getParent() instanceof DDAbsoluteLayout) {
                    handleDropFromAbsoluteParentLayout(event);
                }
            } else {
                handleDropFromLayout(event);
            }
        } else if (event.getTransferable() instanceof DataBoundTransferable) {

            DataBoundTransferable t = (DataBoundTransferable) event.getTransferable();

            String name = t.getItemId() + "";

            Globals.logString("Item ID = " + t.getItemId());

            FVLayout targetLayout = (FVLayout) details.getTarget();

            FocXMLAttributes attributes = new FocXMLAttributes();
            attributes.addAttribute("", FXML.ATT_LEFT, FXML.ATT_LEFT, "CDATA", details.getRelativeLeft() + "px");
            attributes.addAttribute("", FXML.ATT_TOP, FXML.ATT_TOP, "CDATA", details.getRelativeTop() + "px");

            handleSourceContainer(t, targetLayout, name, attributes);

            Globals.logString(targetLayout.toString());
        }
    }

}