cn.dockerfoundry.ide.eclipse.server.ui.internal.editor.ServiceViewerConfigurator.java Source code

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Here is the source code for cn.dockerfoundry.ide.eclipse.server.ui.internal.editor.ServiceViewerConfigurator.java

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/*******************************************************************************
 * Copyright (c) 2012, 2014 Pivotal Software, Inc. 
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of 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.
 *  
 *  Contributors:
 *     Pivotal Software, Inc. - initial API and implementation
 ********************************************************************************/
package cn.dockerfoundry.ide.eclipse.server.ui.internal.editor;

import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;

import cn.dockerfoundry.ide.eclipse.server.ui.internal.ColumnSortListener;
import cn.dockerfoundry.ide.eclipse.server.ui.internal.editor.ServiceViewColumn.ServiceViewColumnDescriptor;

/**
 * Configures the services viewer providers, sorters and columns. Must be called
 * before setting the viewer input.
 * 
 */
public class ServiceViewerConfigurator {

    private boolean addAutomaticViewerResizing;

    public ServiceViewerConfigurator() {
        this.addAutomaticViewerResizing = false;

    }

    public ServiceViewerConfigurator enableAutomaticViewerResizing() {
        addAutomaticViewerResizing = true;
        return this;
    }

    /**
     * This must be called before setting the viewer input
     * @param tableViewer
     */
    public void configureViewer(final TableViewer tableViewer) {

        final Table table = tableViewer.getTable();
        table.setHeaderVisible(true);

        int columnIndex = 0;
        ServiceViewColumnDescriptor descriptor = ServiceViewColumn.getServiceViewColumnDescriptor();

        ServiceViewColumn[] columns = descriptor != null ? descriptor.getServiceViewColumn() : null;

        if (columns == null) {
            return;
        }

        String[] columnProperties = new String[columns.length];
        TableColumn sortColumn = null;
        for (ServiceViewColumn column : columns) {
            columnProperties[columnIndex] = column.name();
            TableColumn tableColumn = new TableColumn(table, SWT.NONE, columnIndex++);
            tableColumn.setData(column);
            tableColumn.setText(column.name());
            tableColumn.setWidth(column.getWidth());
            tableColumn.addSelectionListener(new ColumnSortListener(tableViewer));

            if (column == ServiceViewColumn.Alias) {
                sortColumn = tableColumn;
            }

        }

        // Add a control listener to resize the columns such that there is no
        // empty space
        // after the last column
        if (addAutomaticViewerResizing) {
            table.getParent().addControlListener(new ControlAdapter() {
                public void controlResized(ControlEvent e) {
                    Composite tableComposite = tableViewer.getTable().getParent();
                    Rectangle tableCompositeArea = tableComposite.getClientArea();
                    int width = tableCompositeArea.width;
                    resizeTableColumns(width, table);
                }
            });
        }

        tableViewer.setColumnProperties(columnProperties);

        if (sortColumn != null) {
            table.setSortColumn(sortColumn);
            table.setSortDirection(SWT.UP);
        }
    }

    protected void resizeTableColumns(int tableWidth, Table table) {
        TableColumn[] tableColumns = table.getColumns();

        if (tableColumns.length == 0) {
            return;
        }

        int total = 0;

        // resize only if there is empty space at the end of the table
        for (TableColumn column : tableColumns) {
            total += column.getWidth();
        }

        if (total < tableWidth) {
            // resize the last one
            TableColumn lastColumn = tableColumns[tableColumns.length - 1];
            int newWidth = (tableWidth - total) + lastColumn.getWidth();
            lastColumn.setWidth(newWidth);
        }

    }

}