com.jaspersoft.studio.book.gallery.controls.render.DraggableGroupRenderer.java Source code

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Here is the source code for com.jaspersoft.studio.book.gallery.controls.render.DraggableGroupRenderer.java

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/*******************************************************************************
 * Copyright (C) 2005 - 2014 TIBCO Software Inc. All rights reserved.
 * http://www.jaspersoft.com.
 * 
 * Unless you have purchased  a commercial license agreement from Jaspersoft,
 * the following license terms  apply:
 * 
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 ******************************************************************************/
package com.jaspersoft.studio.book.gallery.controls.render;

import org.apache.commons.lang.ArrayUtils;
import org.eclipse.nebula.widgets.gallery.GalleryItem;
import org.eclipse.nebula.widgets.gallery.NoGroupRenderer;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;

import com.jaspersoft.studio.book.gallery.controls.DropEffectLocation;

/**
 * Group render for the gallery control to add a feedback during the 
 * drag and drop operation
 * 
 * @author Orlandin Marco
 *
 */
public class DraggableGroupRenderer extends NoGroupRenderer {

    /**
     * Specify where the drag and drop feedback must be placed
     */
    private DropEffectLocation dropTargetEffect = null;

    /**
     * Pain all the elements and the if it is available also the drag feedback
     */
    @Override
    public void draw(GC gc, GalleryItem group, int x, int y, int clipX, int clipY, int clipWidth, int clipHeight) {
        super.draw(gc, group, x, y, clipX, clipY, clipWidth, clipHeight);
        paintDropTargetEffect(gc);
    }

    /**
     * Pain the feedback on the gallery item if it is position is provided trought the dropTargetEffect
     * field
     * 
     * @param graphicContext graphic context to pain the feedback on the gallery item
     */
    protected void paintDropTargetEffect(GC graphicContext) {
        if (dropTargetEffect != null && dropTargetEffect.isValid()) {
            int oldStroke = graphicContext.getLineWidth();
            graphicContext.setLineWidth(2);
            GalleryItem elementGroups = dropTargetEffect.getItem().getParentItem();
            int index = ArrayUtils.indexOf(elementGroups.getItems(), dropTargetEffect.getItem());
            Rectangle itemBounds = dropTargetEffect.getItem().getBounds();
            if (dropTargetEffect.isPlacedAfter()) {
                if (index == (elementGroups.getItemCount() - 1)) {
                    // it's the last element, draw the line after it
                    int xAxis = itemBounds.x + itemBounds.width;
                    graphicContext.drawLine(xAxis, itemBounds.y, xAxis, itemBounds.y + itemBounds.height);
                } else {
                    // place the line in the middle between the element and the next one
                    GalleryItem nextItem = elementGroups.getItem(index + 1);
                    Rectangle nextItemBounds = nextItem.getBounds();
                    if (nextItemBounds.y != itemBounds.y) {
                        // the element are on two different levels
                        int xAxis = itemBounds.x + itemBounds.width;
                        graphicContext.drawLine(xAxis, itemBounds.y, xAxis, itemBounds.y + itemBounds.height);
                    } else {
                        DraggableGalleryItemRenderer itemRender = (DraggableGalleryItemRenderer) gallery
                                .getItemRenderer();
                        Rectangle image1Bounds = itemRender.imagesBounds.get(dropTargetEffect.getItem());
                        Rectangle image2Bounds = itemRender.imagesBounds.get(nextItem);
                        int mX = image1Bounds.x + image1Bounds.width;
                        int mWidth = image2Bounds.x - mX;
                        int drawLineX = mX + mWidth / 2 - graphicContext.getLineWidth() / 2;
                        graphicContext.drawLine(drawLineX, itemBounds.y, drawLineX,
                                itemBounds.y + itemBounds.height);
                    }
                }
            } else {
                if (index == 0) {
                    // it's the first element, draw the line before it
                    graphicContext.drawLine(itemBounds.x, itemBounds.y, itemBounds.x,
                            itemBounds.y + itemBounds.height);
                } else {
                    // place the line in the middle between the element and the previous one
                    GalleryItem previousItem = elementGroups.getItem(index - 1);
                    Rectangle previousItemBounds = previousItem.getBounds();
                    if (previousItemBounds.y != itemBounds.y) {
                        // the element are on two different levels
                        graphicContext.drawLine(itemBounds.x, itemBounds.y, itemBounds.x,
                                itemBounds.y + itemBounds.height);
                    } else {
                        DraggableGalleryItemRenderer itemRender = (DraggableGalleryItemRenderer) gallery
                                .getItemRenderer();
                        Rectangle image1Bounds = itemRender.imagesBounds.get(previousItem);
                        Rectangle image2Bounds = itemRender.imagesBounds.get(dropTargetEffect.getItem());
                        int mX = image1Bounds.x + image1Bounds.width;
                        int mWidth = image2Bounds.x - mX;

                        int drawLineX = mX + mWidth / 2 - graphicContext.getLineWidth() / 2;
                        graphicContext.drawLine(drawLineX, itemBounds.y, drawLineX,
                                itemBounds.y + itemBounds.height);
                    }
                }
            }
            graphicContext.setLineWidth(oldStroke);
        }
    }

    /**
     * Set the drop feedback location
     * 
     * @param location a location of the drop feedback. If null no feedback is painted
     */
    public void setDropTargetLocation(DropEffectLocation location) {
        this.dropTargetEffect = location;
    }
}