org.apache.pdfbox.debugger.ui.PrintDpiMenu 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.ui;
import java.awt.Component;
import javax.swing.ButtonGroup;
import javax.swing.JMenu;
import javax.swing.JRadioButtonMenuItem;
/**
* @author Tilman Hausherr
*
* A singleton class that provides the print dpi menu.
*/
public final class PrintDpiMenu extends MenuBase
{
@SuppressWarnings("squid:MaximumInheritanceDepth")
private static class PrintDpiMenuItem extends JRadioButtonMenuItem
{
private static final long serialVersionUID = -475209538362541000L;
private final int dpi;
PrintDpiMenuItem(String text, int dpi)
{
super(text);
this.dpi = dpi;
}
}
private static final int[] DPIS = new int[] { 0, 100, 200, 300, 600, 1200 };
private static PrintDpiMenu instance;
private final JMenu menu;
/**
* Constructor.
*/
private PrintDpiMenu()
{
menu = new JMenu("Print dpi");
ButtonGroup bg = new ButtonGroup();
for (int dpi : DPIS)
{
PrintDpiMenuItem printDpiMenuItem = new PrintDpiMenuItem(dpi == 0 ? "auto" : "" + dpi, dpi);
bg.add(printDpiMenuItem);
menu.add(printDpiMenuItem);
}
changeDpiSelection(0);
setMenu(menu);
}
/**
* Provides the DpiMenu instance.
*
* @return DpiMenu instance.
*/
public static PrintDpiMenu getInstance()
{
if (instance == null)
{
instance = new PrintDpiMenu();
}
return instance;
}
/**
* Set the dpi selection.
*
* @param selection the selected DPI value
*
* @throws IllegalArgumentException if the parameter doesn't belong to a dpi menu item.
*/
public void changeDpiSelection(int selection)
{
for (Component comp : menu.getMenuComponents())
{
PrintDpiMenuItem menuItem = (PrintDpiMenuItem) comp;
if (menuItem.dpi == selection)
{
menuItem.setSelected(true);
return;
}
}
throw new IllegalArgumentException("no dpi menu item found for: " + selection);
}
/**
* Tell the current dpi scale.
*
* @return the current dpi scale.
* @throws IllegalStateException if no dpi menu item is selected.
*/
public static int getDpiSelection()
{
for (Component comp : instance.menu.getMenuComponents())
{
PrintDpiMenuItem menuItem = (PrintDpiMenuItem) comp;
if (menuItem.isSelected())
{
return menuItem.dpi;
}
}
throw new IllegalStateException("no dpi menu item is selected");
}
}