Examples with Command org.eclipse.gef.commands.Command used on opensource projects

Example 71 with Command

use of org.eclipse.gef.commands.Command in project tdi-studio-se by Talend.

the class ComponentChooseDialog method createProperty.

private void createProperty(Object dragModel, EditPart targetEditPart) {
    if (!(dragModel instanceof RepositoryNode && targetEditPart instanceof NodeContainerPart)) {
        return;
    }
    RepositoryNode dragNode = (RepositoryNode) dragModel;
    NodeContainerPart nodePart = (NodeContainerPart) targetEditPart;
    if (dragNode.getObject().getProperty().getItem() instanceof ConnectionItem) {
        ConnectionItem connectionItem = (ConnectionItem) dragNode.getObject().getProperty().getItem();
        Command command = getChangePropertyCommand(dragNode, (Node) nodePart.getNodePart().getModel(), connectionItem);
        if (command != null) {
            execCommandStack(command);
        }
    }
}

Example 72 with Command

use of org.eclipse.gef.commands.Command in project tdi-studio-se by Talend.

the class ComponentChooseDialog method createRefreshingPropertiesCommand.

/**
     * DOC bqian Comment method "createRefreshingPropertiesCommand".
     *
     * @param selectedNode
     * @param node
     */
private List<Command> createRefreshingPropertiesCommand(CompoundCommand cc, RepositoryNode selectedNode, Node node) {
    // List<Command> list = new ArrayList<Command>();
    if (selectedNode.getObject().getProperty().getItem() instanceof ConnectionItem) {
        String propertyId = selectedNode.getObject().getProperty().getId();
        ConnectionItem originalConnectionItem = (ConnectionItem) selectedNode.getObject().getProperty().getItem();
        ConnectionItem connectionItem = originalConnectionItem;
        Connection originalConnection = connectionItem.getConnection();
        Connection connection = connectionItem.getConnection();
        // if component is CDC, replace by the CDC connection.
        if (node.getComponent().getName().contains("CDC")) {
            // to replace by a flag CDC in component? //$NON-NLS-1$
            if (selectedNode.getObject().getProperty().getItem() instanceof DatabaseConnectionItem) {
                final DatabaseConnection databaseConnection = (DatabaseConnection) connection;
                CDCConnection cdcConn = databaseConnection.getCdcConns();
                if (cdcConn != null) {
                    EList cdcTypes = cdcConn.getCdcTypes();
                    if (cdcTypes != null && !cdcTypes.isEmpty()) {
                        CDCType cdcType = (CDCType) cdcTypes.get(0);
                        // replace property by CDC property.
                        propertyId = cdcType.getLinkDB();
                        try {
                            IRepositoryViewObject object = ProxyRepositoryFactory.getInstance().getLastVersion(propertyId);
                            if (object != null) {
                                if (object.getProperty().getItem() instanceof DatabaseConnectionItem) {
                                    DatabaseConnectionItem dbConnItem = (DatabaseConnectionItem) object.getProperty().getItem();
                                    // replace connection by CDC connection
                                    connectionItem = dbConnItem;
                                    connection = dbConnItem.getConnection();
                                }
                            }
                        } catch (PersistenceException e) {
                            ExceptionHandler.process(e);
                        }
                        // set cdc type mode.
                        IElementParameter logModeParam = node.getElementParameter(EParameterName.CDC_TYPE_MODE.getName());
                        if (logModeParam != null) {
                            String cdcTypeMode = ((DatabaseConnection) originalConnection).getCdcTypeMode();
                            Command logModeCmd = new PropertyChangeCommand(node, EParameterName.CDC_TYPE_MODE.getName(), CDCTypeMode.LOG_MODE.getName().equals(cdcTypeMode));
                            cc.add(logModeCmd);
                        }
                        // set lib for as400 so far.
                        //$NON-NLS-1$
                        final String name = "SOURCE_LIB";
                        IElementParameter libParam = node.getElementParameter(name);
                        if (libParam != null) {
                            Object propValue;
                            if (connection.isContextMode() && ContextParameterUtils.isContainContextParam(databaseConnection.getSID())) {
                                propValue = databaseConnection.getSID();
                            } else {
                                propValue = TalendTextUtils.addQuotes(databaseConnection.getSID());
                            }
                            Command libSettingCmd = new PropertyChangeCommand(node, name, propValue);
                            cc.add(libSettingCmd);
                        }
                    }
                }
            }
        }
        // fore EBCDIC, by cli
        if ((connectionItem instanceof EbcdicConnectionItem) && PluginChecker.isEBCDICPluginLoaded()) {
            // TDI-20505:integration the drag/drop for EBCDIC connection and EBCDIC metadataTable
            IRepositoryViewObject object = selectedNode.getObject();
            if (selectedNode.getObjectType() == ERepositoryObjectType.METADATA_FILE_EBCDIC) {
                for (MetadataTable table : ConnectionHelper.getTables(originalConnection)) {
                    Command ebcdicCmd = new RepositoryChangeMetadataForEBCDICCommand(node, IEbcdicConstant.TABLE_SCHEMAS, table.getLabel(), ConvertionHelper.convert(table));
                    cc.add(ebcdicCmd);
                }
            }
            if (selectedNode.getProperties(EProperties.CONTENT_TYPE) == ERepositoryObjectType.METADATA_CON_TABLE) {
                MetadataTable table = null;
                if (object instanceof MetadataTableRepositoryObject) {
                    table = ((MetadataTableRepositoryObject) object).getTable();
                }
                Command ebcdicCmd = new RepositoryChangeMetadataForEBCDICCommand(node, IEbcdicConstant.TABLE_SCHEMAS, table.getLabel(), ConvertionHelper.convert(table));
                cc.add(ebcdicCmd);
            }
        }
        // fore HL7, by gcui
        if ((selectedNode.getObjectType() == ERepositoryObjectType.METADATA_FILE_HL7 && PluginChecker.isHL7PluginLoaded()) || (selectedNode.getParent() != null && selectedNode.getParent().getObjectType() == ERepositoryObjectType.METADATA_FILE_HL7 && PluginChecker.isHL7PluginLoaded())) {
            if (originalConnection instanceof HL7ConnectionImpl) {
                if (((HL7ConnectionImpl) originalConnection).getRoot() != null) {
                    List<Map<String, String>> mapList = new ArrayList<Map<String, String>>();
                    for (Object obj : ((HL7ConnectionImpl) originalConnection).getRoot()) {
                        if (obj instanceof HL7FileNode) {
                            Map<String, String> newMap = new HashMap<String, String>();
                            newMap.put(IHL7Constant.ATTRIBUTE, ((HL7FileNode) obj).getAttribute());
                            newMap.put(IHL7Constant.PATH, ((HL7FileNode) obj).getFilePath());
                            newMap.put(IHL7Constant.COLUMN, ((HL7FileNode) obj).getRelatedColumn());
                            newMap.put(IHL7Constant.ORDER, String.valueOf(((HL7FileNode) obj).getOrder()));
                            newMap.put(IHL7Constant.VALUE, ((HL7FileNode) obj).getDefaultValue());
                            newMap.put(IHL7Constant.REPEATABLE, String.valueOf(((HL7FileNode) obj).isRepeatable()));
                            mapList.add(newMap);
                        }
                    }
                    IExternalNode externalNode = ExternalUtilities.getExternalNodeReadyToOpen(node);
                    if (externalNode != null && externalNode.getElementParameter("ROOT") != null) {
                        //$NON-NLS-1$
                        //$NON-NLS-1$
                        externalNode.getElementParameter("ROOT").setValue(mapList);
                    }
                    String fileName = ((HL7ConnectionImpl) originalConnection).getOutputFilePath();
                    if (externalNode != null && externalNode.getElementParameter("FILENAME") != null && fileName != null) {
                        //$NON-NLS-1$
                        //$NON-NLS-1$
                        externalNode.getElementParameter("FILENAME").setValue(TalendTextUtils.addQuotes(fileName));
                    }
                }
            }
            // fore HL7, by gcui
            if (selectedNode.getObjectType() == ERepositoryObjectType.METADATA_FILE_HL7 && PluginChecker.isHL7PluginLoaded()) {
                for (MetadataTable table : ConnectionHelper.getTablesWithOrders(originalConnection)) {
                    Command hl7Cmd = new RepositoryChangeMetadataForHL7Command(node, IHL7Constant.TABLE_SCHEMAS, table.getLabel(), ConvertionHelper.convert(table));
                    cc.add(hl7Cmd);
                }
            }
        }
        // for brms
        if ((selectedNode.getObjectType() == ERepositoryObjectType.METADATA_FILE_BRMS && PluginChecker.isBRMSPluginLoaded()) || (selectedNode.getParent() != null && selectedNode.getParent().getObjectType() == ERepositoryObjectType.METADATA_FILE_BRMS && PluginChecker.isBRMSPluginLoaded())) {
            if (originalConnection instanceof BRMSConnectionImpl) {
                if (((BRMSConnectionImpl) originalConnection).getRoot() != null) {
                    List<Map<String, String>> rootList = new ArrayList<Map<String, String>>();
                    List<Map<String, String>> loopList = new ArrayList<Map<String, String>>();
                    List<Map<String, String>> groupList = new ArrayList<Map<String, String>>();
                    for (Object obj : ((BRMSConnectionImpl) originalConnection).getRoot()) {
                        if (obj instanceof XMLFileNode) {
                            Map<String, String> rootMap = new HashMap<String, String>();
                            //$NON-NLS-1$
                            rootMap.put("ATTRIBUTE", ((XMLFileNode) obj).getAttribute());
                            //$NON-NLS-1$
                            rootMap.put("PATH", ((XMLFileNode) obj).getXMLPath());
                            //$NON-NLS-1$
                            rootMap.put("COLUMN", ((XMLFileNode) obj).getRelatedColumn());
                            //$NON-NLS-1$
                            rootMap.put("ORDER", String.valueOf(((XMLFileNode) obj).getOrder()));
                            //$NON-NLS-1$
                            rootMap.put("VALUE", ((XMLFileNode) obj).getDefaultValue());
                            rootList.add(rootMap);
                        }
                    }
                    for (Object obj : ((BRMSConnectionImpl) originalConnection).getLoop()) {
                        if (obj instanceof XMLFileNode) {
                            Map<String, String> loopMap = new HashMap<String, String>();
                            //$NON-NLS-1$
                            loopMap.put("ATTRIBUTE", ((XMLFileNode) obj).getAttribute());
                            //$NON-NLS-1$
                            loopMap.put("PATH", ((XMLFileNode) obj).getXMLPath());
                            //$NON-NLS-1$
                            loopMap.put("COLUMN", ((XMLFileNode) obj).getRelatedColumn());
                            //$NON-NLS-1$
                            loopMap.put("ORDER", String.valueOf(((XMLFileNode) obj).getOrder()));
                            //$NON-NLS-1$
                            loopMap.put("VALUE", ((XMLFileNode) obj).getDefaultValue());
                            loopList.add(loopMap);
                        }
                    }
                    for (Object obj : ((BRMSConnectionImpl) originalConnection).getGroup()) {
                        if (obj instanceof XMLFileNode) {
                            Map<String, String> groupMap = new HashMap<String, String>();
                            //$NON-NLS-1$
                            groupMap.put("ATTRIBUTE", ((XMLFileNode) obj).getAttribute());
                            //$NON-NLS-1$
                            groupMap.put("PATH", ((XMLFileNode) obj).getXMLPath());
                            //$NON-NLS-1$
                            groupMap.put("COLUMN", ((XMLFileNode) obj).getRelatedColumn());
                            //$NON-NLS-1$
                            groupMap.put("ORDER", String.valueOf(((XMLFileNode) obj).getOrder()));
                            //$NON-NLS-1$
                            groupMap.put("VALUE", ((XMLFileNode) obj).getDefaultValue());
                            groupList.add(groupMap);
                        }
                    }
                    IExternalNode externalNode = ExternalUtilities.getExternalNodeReadyToOpen(node);
                    if (externalNode != null && externalNode.getElementParameter("ROOT") != null) {
                        //$NON-NLS-1$
                        //$NON-NLS-1$
                        externalNode.getElementParameter("ROOT").setValue(rootList);
                    }
                    if (externalNode != null && externalNode.getElementParameter("LOOP") != null) {
                        //$NON-NLS-1$
                        //$NON-NLS-1$
                        externalNode.getElementParameter("LOOP").setValue(loopList);
                    }
                    if (externalNode != null && externalNode.getElementParameter("GROUP") != null) {
                        //$NON-NLS-1$
                        //$NON-NLS-1$
                        externalNode.getElementParameter("GROUP").setValue(groupList);
                    }
                }
            }
        }
        IElementParameter propertyParam = node.getElementParameterFromField(EParameterFieldType.PROPERTY_TYPE);
        if (propertyParam != null) {
            propertyParam.getChildParameters().get(EParameterName.PROPERTY_TYPE.getName()).setValue(EmfComponent.REPOSITORY);
            propertyParam.getChildParameters().get(EParameterName.REPOSITORY_PROPERTY_TYPE.getName()).setValue(propertyId);
        }
        IProxyRepositoryFactory factory = DesignerPlugin.getDefault().getProxyRepositoryFactory();
        Map<String, IMetadataTable> repositoryTableMap = new HashMap<String, IMetadataTable>();
        if (!originalConnection.isReadOnly()) {
            for (Object tableObj : ConnectionHelper.getTables(originalConnection)) {
                org.talend.core.model.metadata.builder.connection.MetadataTable table;
                table = (org.talend.core.model.metadata.builder.connection.MetadataTable) tableObj;
                if (factory.getStatus(originalConnectionItem) != ERepositoryStatus.DELETED) {
                    if (!factory.isDeleted(table)) {
                        String value = table.getId();
                        IMetadataTable newTable = ConvertionHelper.convert(table);
                        repositoryTableMap.put(value, newTable);
                    }
                }
            }
        }
        // DesignerPlugin.getDefault().getProxyRepositoryFactory().getLastVersion("")
        if (propertyParam != null) {
            // command used to set property type
            IMetadataTable metadataTable = null;
            // && selectedNode.getObjectType() == ERepositoryObjectType.METADATA_CON_TABLE) {
            if (selectedNode.getObject() instanceof IMetadataTable) {
                metadataTable = (IMetadataTable) selectedNode.getObject();
                if (metadataTable != null && repositoryTableMap.get(metadataTable.getId()) != null) {
                    metadataTable = repositoryTableMap.get(metadataTable.getId());
                }
            }
            // }
            ChangeValuesFromRepository command1 = new ChangeValuesFromRepository(node, connection, metadataTable, propertyParam.getName() + ":" + EParameterName.REPOSITORY_PROPERTY_TYPE.getName(), propertyId, //$NON-NLS-1$
            true);
            command1.setMaps(repositoryTableMap);
            if (selectedNode.getProperties(EProperties.CONTENT_TYPE) != ERepositoryObjectType.METADATA_CON_QUERY) {
                command1.setGuessQuery(true);
            }
            setSAPSpecailValueForCommand(selectedNode, command1);
            // for salesForce module
            SalesforceModuleRepositoryObject sfObject = null;
            if (selectedNode.getProperties(EProperties.CONTENT_TYPE) == ERepositoryObjectType.METADATA_SALESFORCE_MODULE) {
                sfObject = (SalesforceModuleRepositoryObject) selectedNode.getObject();
            } else if (selectedNode.getProperties(EProperties.CONTENT_TYPE) == ERepositoryObjectType.METADATA_CON_TABLE) {
                IRepositoryViewObject object = selectedNode.getParent().getObject();
                if (object instanceof SalesforceModuleRepositoryObject) {
                    sfObject = (SalesforceModuleRepositoryObject) object;
                }
            }
            if (sfObject != null) {
                ModelElement modelElement = sfObject.getModelElement();
                if (modelElement instanceof SalesforceModuleUnit) {
                    command1.setSalesForceModuleUnit((SalesforceModuleUnit) modelElement);
                }
            }
            cc.add(command1);
        }
        // command used to set metadata
        getChangeMetadataCommand(cc, selectedNode, node, originalConnectionItem);
        // command used to set query
        if (selectedNode.getProperties(EProperties.CONTENT_TYPE) == ERepositoryObjectType.METADATA_CON_QUERY) {
            IElementParameter queryParam = node.getElementParameterFromField(EParameterFieldType.QUERYSTORE_TYPE);
            QueryRepositoryObject object = (QueryRepositoryObject) selectedNode.getObject();
            Query query = object.getQuery();
            //$NON-NLS-1$
            String value = originalConnectionItem.getProperty().getId() + " - " + query.getLabel();
            if (queryParam != null) {
                RepositoryChangeQueryCommand command3 = new RepositoryChangeQueryCommand(node, query, queryParam.getName() + ":" + EParameterName.REPOSITORY_QUERYSTORE_TYPE.getName(), //$NON-NLS-1$
                value);
                cc.add(command3);
            }
        } else {
            if (connection instanceof DatabaseConnection && hasQuery(node)) {
                DatabaseConnection connection2 = (DatabaseConnection) connection;
                String schema = connection2.getUiSchema();
                String dbType = connection2.getDatabaseType();
                QueryGuessCommand queryGuessCommand = null;
                if (node.getMetadataList().size() == 0) {
                    queryGuessCommand = new QueryGuessCommand(node, null, schema, dbType);
                } else {
                    // modified by hyWang for bug 7190
                    queryGuessCommand = new QueryGuessCommand(node, node.getMetadataList().get(0), schema, dbType, connection);
                }
                if (queryGuessCommand != null) {
                    cc.add(queryGuessCommand);
                }
            }
        }
    // context, moved to ChangeValuesFromRepository(bug 5198)
    // ConnectionContextHelper.addContextForNodeParameter(node, connectionItem);
    } else if (selectedNode.getObject().getProperty().getItem() instanceof ProcessItem) {
        ProcessItem processItem = (ProcessItem) selectedNode.getObject().getProperty().getItem();
        // command used to set job
        String value = processItem.getProperty().getId();
        PropertyChangeCommand command4 = new PropertyChangeCommand(node, EParameterName.PROCESS_TYPE_PROCESS.getName(), value);
        cc.add(command4);
        PropertyChangeCommand command5 = new PropertyChangeCommand(node, EParameterName.PROCESS_TYPE_CONTEXT.getName(), processItem.getProcess().getDefaultContext());
        cc.add(command5);
    } else if (selectedNode.getObject().getProperty().getItem() instanceof FileItem) {
        // hywang add for 6484
        if (selectedNode.getObject().getProperty().getItem() instanceof RulesItem) {
            RulesItem rulesItem = (RulesItem) selectedNode.getObject().getProperty().getItem();
            //                String displayName = "Rules:" + rulesItem.getProperty().getLabel(); //$NON-NLS-N$
            IElementParameter propertyParam = node.getElementParameterFromField(EParameterFieldType.PROPERTY_TYPE);
            if (propertyParam != null) {
                propertyParam.getChildParameters().get(EParameterName.PROPERTY_TYPE.getName()).setValue(EmfComponent.REPOSITORY);
                // propertyParam.getChildParameters().get(EParameterName.REPOSITORY_PROPERTY_TYPE.getName())
                // .setListItemsDisplayName(new String[] { displayName });
                final String showId = rulesItem.getProperty().getId();
                PropertyChangeCommand command6 = new PropertyChangeCommand(node, EParameterName.REPOSITORY_PROPERTY_TYPE.getName(), showId);
                cc.add(command6);
            }
        }
    } else if (selectedNode.getObject().getProperty().getItem() instanceof LinkRulesItem) {
        LinkRulesItem linkItem = (LinkRulesItem) selectedNode.getObject().getProperty().getItem();
        IElementParameter propertyParam = node.getElementParameterFromField(EParameterFieldType.PROPERTY_TYPE);
        if (propertyParam != null) {
            propertyParam.getChildParameters().get(EParameterName.PROPERTY_TYPE.getName()).setValue(EmfComponent.REPOSITORY);
            // propertyParam.getChildParameters().get(EParameterName.REPOSITORY_PROPERTY_TYPE.getName())
            // .setListItemsDisplayName(new String[] { displayName });
            final String showId = linkItem.getProperty().getId();
            PropertyChangeCommand command7 = new PropertyChangeCommand(node, EParameterName.REPOSITORY_PROPERTY_TYPE.getName(), showId);
            cc.add(command7);
        }
    }
    return null;
}

Example 73 with Command

use of org.eclipse.gef.commands.Command in project tdi-studio-se by Talend.

the class ProcessLayoutEditPolicy method getCreateCommand.

// ------------------------------------------------------------------------
// Abstract methods from LayoutEditPolicy
/*
     * (non-Javadoc)
     * 
     * @see org.eclipse.gef.editpolicies.LayoutEditPolicy#getCreateCommand(org.eclipse.gef.requests.CreateRequest)
     */
@Override
protected Command getCreateCommand(final CreateRequest request) {
    if (((Process) getHost().getModel()).isReadOnly()) {
        return null;
    }
    Rectangle constraint = (Rectangle) getConstraintFor(request);
    Command command = null;
    if (Note.class.equals(request.getNewObjectType())) {
        command = new CreateNoteCommand((Process) getHost().getModel(), (Note) request.getNewObject(), constraint.getLocation());
    } else if (request.getNewObject() instanceof Node) {
        Node node = (Node) request.getNewObject();
        NodeContainer nodeContainer = ((Process) node.getProcess()).loadNodeContainer(node, false);
        command = new CreateNodeContainerCommand((Process) getHost().getModel(), nodeContainer, constraint.getLocation());
    }
    return command;
}

Example 74 with Command

use of org.eclipse.gef.commands.Command in project tdi-studio-se by Talend.

the class UpdateManagerUtils method executeUpdate.

private static void executeUpdate(UpdateResult result, IProgressMonitor monitor, boolean updateAllJobs) {
    if (result.isReadOnlyProcess()) {
        return;
    }
    // update
    Command command = null;
    IUpdateItemType updateType = result.getUpdateType();
    if (updateType instanceof EUpdateItemType) {
        switch((EUpdateItemType) updateType) {
            case NODE_PROPERTY:
            case NODE_SCHEMA:
            case NODE_QUERY:
            case NODE_SAP_IDOC:
            case NODE_SAP_FUNCTION:
            case NODE_VALIDATION_RULE:
                command = new UpdateNodeParameterCommand(result);
                break;
            case JOB_PROPERTY_EXTRA:
            case JOB_PROPERTY_STATS_LOGS:
            case JOB_PROPERTY_HEADERFOOTER:
            case JOB_PROPERTY_STORM:
            case JOB_PROPERTY_MAPREDUCE:
                command = new UpdateMainParameterCommand(result);
                break;
            case CONTEXT:
                command = executeContextUpdates(result);
                break;
            case CONTEXT_GROUP:
                command = executeContextGroupUpdates(result);
                break;
            case JOBLET_RENAMED:
            case JOBLET_SCHEMA:
            case RELOAD:
                command = executeJobletNodesUpdates(result);
                break;
            case JUNIT_RELOAD:
                command = executeJunitNodesUpdates(result);
                break;
            // break;
            case MAP_PATH:
                command = new UpdateNodePathCommand(result);
                break;
            default:
                break;
        }
    }
    if (command != null) {
        SubProgressMonitor subMonitor = new SubProgressMonitor(monitor, 1 * UpdatesConstants.SCALE, SubProgressMonitor.PREPEND_MAIN_LABEL_TO_SUBTASK);
        subMonitor.beginTask(UpdatesConstants.EMPTY, 1);
        subMonitor.subTask(getResultTaskInfor(result));
        //
        Object job = result.getJob();
        boolean executed = false;
        if (job != null && job instanceof IGEFProcess) {
            IDesignerCoreUIService designerCoreUIService = CoreUIPlugin.getDefault().getDesignerCoreUIService();
            if (designerCoreUIService != null) {
                executed = designerCoreUIService.executeCommand((IGEFProcess) job, command);
            }
        }
        if (!executed) {
            command.execute();
        }
        subMonitor.worked(1);
    }
    // from extension point
    UpdateManagerProviderDetector.INSTANCE.doUpdate(monitor, result);
}

Example 75 with Command

use of org.eclipse.gef.commands.Command in project tdi-studio-se by Talend.

the class TalendConnectionCreationTool method handleCreateConnection.

/*
     * override this method for issue 1253.
     * 
     * @see org.eclipse.gef.tools.AbstractConnectionCreationTool#handleCreateConnection()
     */
@Override
protected boolean handleCreateConnection() {
    Command endCommand = getCommand();
    if (endCommand != null) {
        return super.handleCreateConnection();
    }
    if (getTargetEditPart() == null) {
        EditPart processPart = getProcessPart(this.sourcePart);
        if (processPart != null) {
            this.setTargetEditPart(getProcessPart(this.sourcePart));
            this.getTargetRequest().setType(RequestConstants.REQ_CONNECTION_END);
        }
        return handleConnection();
    }
    if (isInState(STATE_TERMINAL)) {
        // Fake a drag to cause feedback to be displayed immediately on mouse down.
        setState(STATE_CONNECTION_STARTED);
        handleDrag();
    }
    return true;
}