de.fkoeberle.autocommit.message.ui.CMFDropAdapter.java Source code

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Here is the source code for de.fkoeberle.autocommit.message.ui.CMFDropAdapter.java

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/*
 * Copyright (C) 2012, Florian Kberle <florian@fkoeberle.de>
 *
 * All rights reserved. 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 de.fkoeberle.autocommit.message.ui;

import java.util.Map;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.ViewerDropAdapter;
import org.eclipse.swt.dnd.TransferData;

import de.fkoeberle.autocommit.message.ui.Model.CMFList;

public class CMFDropAdapter extends ViewerDropAdapter {
    private final Model model;
    private final TableViewer targetTable;
    private final CMFList targetListType;
    private final Map<Long, CMFList> listIdToTypeMap;
    private final Map<CMFList, TableViewer> listTypeToTableViewerMap;

    public CMFDropAdapter(CMFList targetListType, Model model, Map<Long, CMFList> listIdToTypeMap,
            Map<CMFList, TableViewer> listTypeToTableViewerMap) {
        super(listTypeToTableViewerMap.get(targetListType));
        this.model = model;
        this.targetTable = listTypeToTableViewerMap.get(targetListType);
        this.targetListType = targetListType;
        this.listIdToTypeMap = listIdToTypeMap;
        this.listTypeToTableViewerMap = listTypeToTableViewerMap;
    }

    @Override
    public boolean validateDrop(Object target, int operation, TransferData transferType) {
        return true;
    }

    private int determineInsertIndex() {
        int insertIndex;
        if (getCurrentLocation() == LOCATION_NONE) {
            insertIndex = model.getList(targetListType).size();
        } else {
            int targetIndex = model.getList(targetListType).indexOf(getCurrentTarget());
            if (getCurrentLocation() == LOCATION_BEFORE || (getCurrentLocation() == LOCATION_ON)) {
                insertIndex = targetIndex;
            } else {
                assert ((getCurrentLocation() == LOCATION_AFTER));
                insertIndex = targetIndex + 1;
            }
        }
        return insertIndex;
    }

    @Override
    public boolean performDrop(Object data) {
        CMFList sourceListType = listIdToTypeMap.get(data);
        if (sourceListType == null) {
            return false;
        }
        TableViewer sourceTable = listTypeToTableViewerMap.get(sourceListType);
        int insertIndex = determineInsertIndex();
        try {
            model.moveFactories(sourceListType, targetListType, sourceTable.getTable().getSelectionIndices(),
                    insertIndex);
        } catch (ExecutionException e) {
            CMFMultiPageEditorPart.reportError(targetTable.getTable().getShell(), "Drop failed", e);
            return false;
        }

        return true;
    }
}