org.apache.pdfbox.debugger.hexviewer.AddressPane Maven / Gradle / Ivy
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The Apache PDFBox library is an open source Java tool for working with PDF documents.
This artefact contains the PDFDebugger.
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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 org.apache.pdfbox.debugger.hexviewer;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.JComponent;
/**
* @author Khyrul Bashar
*
* This class shows the address of the currently selected byte.
*/
class AddressPane extends JComponent
{
private final int totalLine;
private int selectedLine = -1;
private int selectedIndex = -1;
/**
* Constructor.
* @param total int. Total line number needed to show all the bytes.
*/
AddressPane(int total)
{
totalLine = total;
setPreferredSize(new Dimension(HexView.ADDRESS_PANE_WIDTH, HexView.CHAR_HEIGHT * (totalLine+1)));
setFont(HexView.FONT);
}
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.setRenderingHints(HexView.RENDERING_HINTS);
Rectangle bound = getVisibleRect();
int x = HexView.LINE_INSET;
int y = bound.y;
if (y == 0 || y%HexView.CHAR_HEIGHT != 0)
{
y += HexView.CHAR_HEIGHT - y%HexView.CHAR_HEIGHT;
}
int firstLine = y/HexView.CHAR_HEIGHT;
for (int line = firstLine; line < firstLine + bound.getHeight()/HexView.CHAR_HEIGHT; line++)
{
if (line > totalLine)
{
break;
}
if (line == selectedLine)
{
paintSelected(g, x, y);
}
else
{
g.drawString(String.format("%08X", (line - 1)*16), x, y);
}
x = HexView.LINE_INSET;
y += HexView.CHAR_HEIGHT;
}
}
/**
* Paint a selected line
* @param g Graphics instance.
* @param x int. x axis value.
* @param y int. y axis value.
*/
private void paintSelected(Graphics g, int x, int y)
{
g.setColor(HexView.SELECTED_COLOR);
g.setFont(HexView.BOLD_FONT);
g.drawString(String.format("%08X", selectedIndex), x, y);
g.setColor(Color.black);
g.setFont(HexView.FONT);
}
/**
* Updates the line text (index in hexadecimal) for a given index. It is used when a byte is
* selected in hex pane.
* @param index int.
*/
void setSelected(int index)
{
if (index != selectedIndex)
{
selectedLine = HexModel.lineNumber(index);
selectedIndex = index;
repaint();
}
}
}