[jira] [Created] (NETBEANS-3355) SideBarFactory painting offset with large files

["Benedikt Schlagberger (Jira)" <ji...@apache.org>]

Benedikt Schlagberger created NETBEANS-3355:
-----------------------------------------------

             Summary: SideBarFactory painting offset with large files
                 Key: NETBEANS-3355
                 URL: https://issues.apache.org/jira/browse/NETBEANS-3355
             Project: NetBeans
          Issue Type: Bug
    Affects Versions: 11.0, 8.2
            Reporter: Benedikt Schlagberger
         Attachments: Bildschirmfoto von 2019-11-07 19-34-21.png

When painting in the sidebar using the {{SideBarFactory}}, the painted Graphic is offset for large files. To reproduce, create a NetBeans plugin project and add the following class:
{code:java}
package com.mycompany.sidebar_test;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.text.JTextComponent;
import org.netbeans.spi.editor.SideBarFactory;

public class MySidebarFactory implements SideBarFactory {
    @Override
    public JComponent createSideBar(JTextComponent jtc) {
        return new MySidebar();
    }

    private class MySidebar extends JComponent {
        @Override
        protected void paintComponent(Graphics g) {
            g.setColor(Color.BLUE);
            g.fillRect(0, 0, 10, 1000);
        }

        @Override
        public Dimension getPreferredSize() {
            Dimension dimension = new Dimension(this.getParent().getSize());
            dimension.width = 10;

            return dimension;
        }
    }
}
{code}

Register the {{SideBarFactory}} using the following {{layers.xml}}:
{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE filesystem PUBLIC "-//NetBeans//DTD Filesystem 1.2//EN" "http://www.netbeans.org/dtds/filesystem-1_2.dtd">
<filesystem>
    <folder name="Editors">
        <folder name="SideBar">
            <file name="com-mycompany-sidebar_test-MySidebarFactory.instance">
                <attr name="location" stringvalue="West"/>
            </file>
        </folder>
    </folder>
</filesystem>
{code}

Now start the plugin and open a project containing a large file for example the [StrBuilder.java|https://raw.githubusercontent.com/apache/commons-lang/master/src/main/java/org/apache/commons/lang3/text/StrBuilder.java] from the apache commons lib.

The painting is offset by a large amount as you can see in the attached screenshot. When shortening the file and re-opening it, the marker moves, so I suppose this is related to the file size.



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