com.starterkit.todo.Tracker.TableColumnTracker.java Source code

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Here is the source code for com.starterkit.todo.Tracker.TableColumnTracker.java

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/*******************************************************************************
 * Copyright (c) 2014 Christian Pontesegger and others.
 * 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
 *
 * Contributors:
 *     Christian Pontesegger - initial API and implementation
 *******************************************************************************/
package com.starterkit.todo.Tracker;

import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Table;

public class TableColumnTracker implements Listener {

    public static final int NO_COLUMN = -1;

    private final TableViewer fTableViewer;
    private boolean fHeaderArea = false;
    private int fSelectedColumnIndex = NO_COLUMN;

    public TableColumnTracker(TableViewer tableViewer) {
        fTableViewer = tableViewer;
        fTableViewer.getTable().addListener(SWT.MenuDetect, this);
    }

    @Override
    public void handleEvent(Event event) {
        Table table = fTableViewer.getTable();
        Point point = Display.getDefault().map(null, table, new Point(event.x, event.y));
        Rectangle clientArea = table.getClientArea();
        fHeaderArea = (clientArea.y <= point.y) && (point.y < (clientArea.y + table.getHeaderHeight()));

        ViewerCell cell = fTableViewer.getCell(point);
        if (cell != null)
            fSelectedColumnIndex = cell.getColumnIndex();

        else {
            // no cell detected, click on header
            int xOffset = point.x;
            int columnIndex = 0;
            int[] order = table.getColumnOrder();
            while ((columnIndex < table.getColumnCount())
                    && (xOffset > table.getColumn(order[columnIndex]).getWidth())) {
                xOffset -= table.getColumn(order[columnIndex]).getWidth();
                columnIndex++;
            }

            fSelectedColumnIndex = (columnIndex < table.getColumnCount()) ? order[columnIndex] : NO_COLUMN;
        }
    }

    public boolean isHeaderArea() {
        return fHeaderArea;
    }

    public int getSelectedColumnIndex() {
        return fSelectedColumnIndex;
    }
}