vaadin-framework/client/src/main/java/com/vaadin/client/connectors/grid/SingleSelectionModelConnector.java

/*
 * Copyright 2000-2016 Vaadin Ltd.
 *
 * 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.vaadin.client.connectors.grid;

import com.vaadin.client.widget.grid.events.GridSelectionAllowedEvent;
import com.vaadin.client.widget.grid.selection.ClickSelectHandler;
import com.vaadin.client.widget.grid.selection.SelectionModel;
import com.vaadin.shared.data.DataCommunicatorConstants;
import com.vaadin.shared.data.selection.SelectionServerRpc;
import com.vaadin.shared.ui.Connect;

import elemental.json.JsonObject;

/**
 * Client side connector for grid single selection model.
 *
 * @author Vaadin Ltd.
 *
 * @since 8.0
 */
@Connect(com.vaadin.ui.components.grid.SingleSelectionModelImpl.class)
public class SingleSelectionModelConnector
        extends AbstractSelectionModelConnector {

    private ClickSelectHandler<JsonObject> clickSelectHandler;

    /**
     * Single selection model for grid.
     */
    protected class SingleSelectionModel implements SelectionModel<JsonObject> {

        private boolean isSelectionAllowed = true;

        @Override
        public void select(JsonObject item) {
            getRpcProxy(SelectionServerRpc.class)
                    .select(item.getString(DataCommunicatorConstants.KEY));
        }

        @Override
        public void deselect(JsonObject item) {
            getRpcProxy(SelectionServerRpc.class)
                    .deselect(item.getString(DataCommunicatorConstants.KEY));
        }

        @Override
        public boolean isSelected(JsonObject item) {
            return SingleSelectionModelConnector.this.isSelected(item);
        }

        @Override
        public void deselectAll() {
            getRpcProxy(SelectionServerRpc.class).select(null);
        }

        @Override
        public void setSelectionAllowed(boolean selectionAllowed) {
            isSelectionAllowed = selectionAllowed;
            getGrid()
                    .fireEvent(new GridSelectionAllowedEvent(selectionAllowed));
        }

        @Override
        public boolean isSelectionAllowed() {
            return isSelectionAllowed;
        }
    }

    @Override
    protected void initSelectionModel() {
        getGrid().setSelectionModel(new SingleSelectionModel());

        clickSelectHandler = new ClickSelectHandler<>(getParent().getWidget());
    }

    @Override
    public void onUnregister() {
        super.onUnregister();
        if (clickSelectHandler != null) {
            clickSelectHandler.removeHandler();
        }
    }

}