com.questoid.sqlitebrowser.data.DataLabelProvider.java Source code

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Here is the source code for com.questoid.sqlitebrowser.data.DataLabelProvider.java

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/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY. 
 * See the GNU General Public License for more details.
 * 
 * Copyright (C) 2010 Questoid.com
 */
package com.questoid.sqlitebrowser.data;

import java.io.ByteArrayInputStream;

import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.widgets.Display;

public class DataLabelProvider extends LabelProvider implements ITableLabelProvider {

    private final Display display = Display.getDefault();

    private Image resize(final Image image, final int width, final int height) {
        final Image scaled = new Image(display, width, height);
        final GC gc = new GC(scaled);
        gc.setAntialias(SWT.ON);
        gc.setInterpolation(SWT.HIGH);
        gc.drawImage(image, 0, 0, image.getBounds().width, image.getBounds().height, 0, 0, width, height);
        gc.dispose();
        image.dispose(); // don't forget about me!
        return scaled;
    }

    private Image makeScaledImage(final byte[] bytes) {
        final ImageData data = new ImageData(new ByteArrayInputStream(bytes));
        final Image image = new Image(display, data);
        int height = data.height;
        int width = data.width;

        final int length = height > width ? height : width;
        float percent = 100;
        if (length > 64) {
            percent = 64f / length;

            height *= percent;
            width *= percent;
        }

        final Image scaled = resize(image, width, height);

        return scaled;
    }

    @Override
    public Image getColumnImage(final Object element, final int index) {

        // DataRow dataRow = (DataRow) element;
        // if (dataRow != null && dataRow.getValueAt(index) != null) {
        // Object val = dataRow.getValueAt(index);
        // if (val instanceof SqlJetMemoryPointer) {
        //
        // SqlJetMemoryPointer p = (SqlJetMemoryPointer) val;
        //
        // int size = p.remaining();
        // byte[] bytes = new byte[size];
        // p.getBytes(bytes);
        //
        // try {
        // return makeScaledImage(bytes);
        // } catch (SWTException e) {
        // e.printStackTrace();
        // }
        // }
        // }

        return null;
    }

    @Override
    public String getColumnText(final Object element, final int index) {
        final DataRow dataRow = (DataRow) element;
        if (dataRow != null && dataRow.getValueAt(index) != null) {

            final Object val = dataRow.getValueAt(index);
            // if (val instanceof SqlJetMemoryPointer) {
            // return "";
            // }

            return dataRow.getValueAt(index).toString();
        } else {
            return "";
        }

    }
}