com.github.fritaly.dualcommander.event.ColumnEventHelper.java Source code

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Here is the source code for com.github.fritaly.dualcommander.event.ColumnEventHelper.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.github.fritaly.dualcommander.event;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.event.ChangeEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.TableColumnModelEvent;
import javax.swing.event.TableColumnModelListener;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;

import org.apache.commons.lang.Validate;

// See http://stackoverflow.com/questions/8752694/java-jtable-detect-column-re-sized-by-user
public final class ColumnEventHelper extends MouseAdapter implements TableColumnModelListener {

    private final ColumnEventListener listener;

    private boolean resizing = false;

    private int resizingColumn = -1;

    private int oldWidth = -1;

    public ColumnEventHelper(ColumnEventListener listener) {
        Validate.notNull(listener, "The given listener is null");

        this.listener = listener;
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // capture start of resize
        if (e.getSource() instanceof JTableHeader) {
            final TableColumn column = ((JTableHeader) e.getSource()).getResizingColumn();

            if (column != null) {
                resizing = true;
                resizingColumn = column.getModelIndex();
                oldWidth = column.getPreferredWidth();
            } else {
                resizingColumn = -1;
                oldWidth = -1;
            }
        }
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        if (resizing) {
            if (e.getSource() instanceof JTableHeader) {
                final TableColumn column = ((JTableHeader) e.getSource()).getColumnModel()
                        .getColumn(resizingColumn);

                if (column != null) {
                    int newWidth = column.getPreferredWidth();

                    if (newWidth != oldWidth) {
                        listener.columnResized(new ColumnEvent(column));
                    }
                }
            }
        }

        resizing = false;
        resizingColumn = -1;
        oldWidth = -1;
    }

    @Override
    public void columnAdded(TableColumnModelEvent e) {
    }

    @Override
    public void columnMarginChanged(ChangeEvent e) {
    }

    @Override
    public void columnMoved(TableColumnModelEvent e) {
    }

    @Override
    public void columnRemoved(TableColumnModelEvent e) {
    }

    @Override
    public void columnSelectionChanged(ListSelectionEvent e) {
    }
}