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/**
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* Copyright (C) 2017 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.editor.descriptiveDataSet.character;
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import java.util.Collection;
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import java.util.stream.Collectors;
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import org.eclipse.jface.viewers.IStructuredSelection;
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import org.eclipse.jface.viewers.TreeSelection;
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import org.eclipse.jface.viewers.TreeViewer;
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import org.eclipse.nebula.widgets.nattable.util.GUIHelper;
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import org.eclipse.swt.dnd.DragSourceEvent;
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import org.eclipse.swt.graphics.GC;
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import org.eclipse.swt.graphics.Image;
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import org.eclipse.swt.graphics.Point;
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import org.eclipse.swt.widgets.Display;
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import eu.etaxonomy.cdm.model.description.Character;
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import eu.etaxonomy.cdm.model.description.FeatureNode;
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import eu.etaxonomy.taxeditor.featuretree.CharacterTransfer;
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import eu.etaxonomy.taxeditor.featuretree.e4.FeatureNodeDragListener;
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/**
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* @author pplitzner
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* @since Jun 2, 2017
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*
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*/
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public class CharacterDragListener extends FeatureNodeDragListener {
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private TreeViewer structureViewer;
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private TreeViewer propertyViewer;
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Collection<Character> characters;
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private Image image;
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private GC gc;
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public CharacterDragListener(TreeViewer structureViewer, TreeViewer propertyViewer) {
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super(propertyViewer);
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this.structureViewer = structureViewer;
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this.propertyViewer = propertyViewer;
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}
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@Override
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public void dragFinished(DragSourceEvent event) {
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characters = null;
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if(image!=null){
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image.dispose();
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image = null;
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}
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if(gc!=null){
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gc.dispose();
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gc = null;
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}
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super.dragFinished(event);
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}
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@Override
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public void dragSetData(DragSourceEvent event) {
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if (CharacterTransfer.getInstance().isSupportedType(event.dataType)) {
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event.data = characters;
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}
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}
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@Override
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public void dragStart(DragSourceEvent event) {
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event.doit =
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!structureViewer.getSelection().isEmpty()
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&& !propertyViewer.getSelection().isEmpty()
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&& ((IStructuredSelection) structureViewer.getSelection()).toList()
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.stream().allMatch(element -> element instanceof FeatureNode)
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&& ((IStructuredSelection) propertyViewer.getSelection()).toList()
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.stream().allMatch(element -> element instanceof FeatureNode);
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if(!event.doit){
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return;
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}
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TreeSelection structureSelection = (TreeSelection) structureViewer.getSelection();
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TreeSelection propertySelection = (TreeSelection) propertyViewer.getSelection();
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if(structureSelection!=null && propertySelection!=null
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&& !structureSelection.isEmpty() && !propertySelection.isEmpty()){
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//create all possible characters
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characters = CharacterEditor.createCharacters(structureSelection, propertySelection);
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}
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String text = characters.stream().map(character->character.generateTitle()).collect(Collectors.joining("\n"));
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// creating temporary GC for size calculation
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gc = new GC(Display.getDefault());
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// Calculate text extent
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Point compositeSize = gc.textExtent(text);
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//remove temporary gc
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gc.dispose();
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gc = null;
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// Creating new Image
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image = new Image(Display.getCurrent(),compositeSize.x+10,compositeSize.y+10);
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//create gc for image to be able to draw on it
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gc = new GC(image);
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//set and fill with bg color
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gc.setBackground(GUIHelper.COLOR_LIST_BACKGROUND);
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gc.fillRectangle(0, 0, compositeSize.x+10, compositeSize.y+10);
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//draw text
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gc.drawText(text, 5, 5, true);
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//draw border
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gc.drawRectangle(0, 0, compositeSize.x+9, compositeSize.y+9);
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// Setting widget to DnD image
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event.image = image;
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}
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}
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