content: package com.actelion.research.gui.hidpi;
  
  /*
  * Copyright (c) 1997 - 2016
  * Actelion Pharmaceuticals Ltd.
  * Gewerbestrasse 16
  * CH-4123 Allschwil, Switzerland
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice, this
  *    list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  * 3. Neither the name of the the copyright holder nor the
  *    names of its contributors may be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
  
  
  		import java.awt.Color;
  		import java.awt.Font;
  		import java.io.StringReader;
  
  		import javax.swing.text.Document;
  		import javax.swing.text.Element;
  		import javax.swing.text.View;
  		import javax.swing.text.ViewFactory;
  		import javax.swing.text.html.HTMLDocument;
  		import javax.swing.text.html.HTMLEditorKit;
  		import javax.swing.text.html.ImageView;
  		import javax.swing.text.html.StyleSheet;
  
  @SuppressWarnings("serial")
  public class ScaledEditorKit extends HTMLEditorKit {
  	public static float getFontScaleFactor() {
  		return HiDPIHelper.getUIScaleFactor();
  	}
  
  	/** Shared base style for all documents created by us use. */
  	private static StyleSheet defaultStyles;
  
  	public ScaledEditorKit() {
  	};
  
  	/**
  	 * Overriden to return our own slimmed down style sheet.
  	 */
  	public StyleSheet getStyleSheet() {
  		if (defaultStyles == null) {
  			defaultStyles = new StyleSheet();
  			StringReader r = new StringReader(ScaledHTML.styleChanges);
  			try {
  				defaultStyles.loadRules(r, null);
  			}
  			catch (Throwable e) {
  				// don't want to die in static initialization...
  				// just display things wrong.
  			}
  			r.close();
  			defaultStyles.addStyleSheet(super.getStyleSheet());
  		}
  		return defaultStyles;
  	}
  
  	@Override
  	public Document createDefaultDocument() {
  		StyleSheet styles = getStyleSheet();
  		StyleSheet ss = new ScaledStyleSheet();
  		ss.addStyleSheet(styles);
  		HTMLDocument doc = new HTMLDocument(ss);
  		doc.setParser(getParser());
  		doc.setAsynchronousLoadPriority(4);
  		doc.setTokenThreshold(100);
  		return doc;
  	}
  
  	/**
  	 * Sets the async policy to flush everything in one chunk, and
  	 * to not display unknown tags.
  	 */
  	Document createDefaultDocument(Font defaultFont, Color foreground) {
  		StyleSheet styles = getStyleSheet();
  		StyleSheet ss = new ScaledStyleSheet();
  		ss.addStyleSheet(styles);
  		HTMLDocument doc = new HTMLDocument(ss);
  		doc.setPreservesUnknownTags(false);
  		doc.getStyleSheet().addRule(displayPropertiesToCSS(defaultFont, foreground));
  		doc.setParser(getParser());
  		doc.setAsynchronousLoadPriority(Integer.MAX_VALUE);
  		doc.setPreservesUnknownTags(false);
  		return doc;
  	}
  
  	private String displayPropertiesToCSS(Font font, Color fg) {
  		StringBuffer rule = new StringBuffer("body {");
  		if (font != null) {
  			rule.append(" font-family: ");
  			rule.append(font.getFamily());
  			rule.append(" ; ");
  			rule.append(" font-size: ");
  			final int fontSize = Math.round(font.getSize() / getFontScaleFactor());
  			rule.append(fontSize);
  			rule.append("pt ;");
  			if (font.isBold()) {
  				rule.append(" font-weight: bold ; ");
  			}
  			if (font.isItalic()) {
  				rule.append(" font-style: italic ; ");
  			}
  		}
  		if (fg != null) {
  			rule.append(" color: ").append(colorToString(fg)).append(" ; ");
  		}
  		rule.append(" }");
  		return rule.toString();
  	}
  
  	private String colorToString(final Color col) {
  		if (col == null) {
  			return null;
  		}
  		return String.format("#%02x%02x%02x", col.getRed(), col.getGreen(), col.getBlue());
  	}
  
  	/**
  	 * Returns the ViewFactory that is used to make sure the Views don't
  	 * load in the background.
  	 */
  	public ViewFactory getViewFactory() {
  		if (basicHTMLViewFactory == null) {
  			basicHTMLViewFactory = new BasicHTMLViewFactory();
  		}
  		return basicHTMLViewFactory;
  	}
  
  	/**
  	 * BasicHTMLViewFactory extends HTMLFactory to force images to be loaded
  	 * synchronously.
  	 */
  	static class BasicHTMLViewFactory extends HTMLEditorKit.HTMLFactory {
  		public View create(Element elem) {
  			View view = super.create(elem);
  
  			if (view instanceof ImageView) {
  				((ImageView)view).setLoadsSynchronously(true);
  			}
  			return view;
  		}
  	}
  
  
  	static public ScaledEditorKit create() {
  		if (kit == null) {
  			kit = new ScaledEditorKit();
  		}
  		return kit;
  	}
  
  	/**
  	 * The source of the html renderers
  	 */
  	private static ScaledEditorKit kit;
  	/**
  	 * Creates the Views that visually represent the model.
  	 */
  	static ViewFactory basicHTMLViewFactory;
  }
  