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SWT custom HtmlToolTip

    博客分类：
  • SWT
HTMLEclipseCSSUI 
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public class HtmlTooltip extends BrowserInformationControl{
	
	public final static String APPEARANCE_JAVADOC_FONT= "org.eclipse.jdt.ui.javadocfont"; //$NON-NLS-1$
	
	private static final String fgStyleSheet= "/* Font definitions */\n" + //$NON-NLS-1$
	"body, h1, h2, h3, h4, h5, h6, p, table, td, caption, th, ul, ol, dl, li, dd, dt {font-family: sans-serif; font-size: 9pt }\n" + //$NON-NLS-1$
	"pre				{ font-family: monospace; font-size: 9pt }\n" + //$NON-NLS-1$
	"\n" + //$NON-NLS-1$
	"/* Margins */\n" + //$NON-NLS-1$
	"body	     { overflow: auto; margin-top: 0; margin-bottom: 4; margin-left: 3; margin-right: 0 }\n" + //$NON-NLS-1$
	"h1           { margin-top: 5; margin-bottom: 1 }	\n" + //$NON-NLS-1$
	"h2           { margin-top: 25; margin-bottom: 3 }\n" + //$NON-NLS-1$
	"h3           { margin-top: 20; margin-bottom: 3 }\n" + //$NON-NLS-1$
	"h4           { margin-top: 20; margin-bottom: 3 }\n" + //$NON-NLS-1$
	"h5           { margin-top: 0; margin-bottom: 0 }\n" + //$NON-NLS-1$
	"p            { margin-top: 10px; margin-bottom: 10px }\n" + //$NON-NLS-1$
	"pre	         { margin-left: 6 }\n" + //$NON-NLS-1$
	"ul	         { margin-top: 0; margin-bottom: 10 }\n" + //$NON-NLS-1$
	"li	         { margin-top: 0; margin-bottom: 0 } \n" + //$NON-NLS-1$
	"li p	     { margin-top: 0; margin-bottom: 0 } \n" + //$NON-NLS-1$
	"ol	         { margin-top: 0; margin-bottom: 10 }\n" + //$NON-NLS-1$
	"dl	         { margin-top: 0; margin-bottom: 10 }\n" + //$NON-NLS-1$
	"dt	         { margin-top: 0; margin-bottom: 0; font-weight: bold }\n" + //$NON-NLS-1$
	"dd	         { margin-top: 0; margin-bottom: 0 }\n" + //$NON-NLS-1$
	"\n" + //$NON-NLS-1$
	"/* Styles and colors */\n" + //$NON-NLS-1$
	"a:link	     { color: #0000FF }\n" + //$NON-NLS-1$
	"a:hover	     { color: #000080 }\n" + //$NON-NLS-1$
	"a:visited    { text-decoration: underline }\n" + //$NON-NLS-1$
	"h4           { font-style: italic }\n" + //$NON-NLS-1$
	"strong	     { font-weight: bold }\n" + //$NON-NLS-1$
	"em	         { font-style: italic }\n" + //$NON-NLS-1$
	"var	         { font-style: italic }\n" + //$NON-NLS-1$
	"th	         { font-weight: bold }\n" + //$NON-NLS-1$
	""; //$NON-NLS-1$

	
	public HtmlTooltip(Shell parent,boolean resizable) {
		super(parent, APPEARANCE_JAVADOC_FONT, resizable);
	}
	
	public HtmlTooltip(Shell parent, String symbolicFontName, boolean resizable) {
		super(parent, symbolicFontName, resizable);
	}
	
	protected void createContent(Composite parent) {
		super.createContent(parent);
		super.addLocationListener(new LocationListener() {
			
			public void changing(LocationEvent event) {
				String url = event.location;
				if (url.startsWith("about:")) {
					return;
				}
				event.doit = false;
				if( url.startsWith("http"))
					launchBrowser(url);
			}
			
			public void changed(LocationEvent event) {
				
			}
		});
	}
	
	protected void launchBrowser(String url) {
		// open url in external browser
		 Program.launch(url);		
	}

	public void setTooltip(String content){
		content= addCSSToHTMLFragment(content);
		super.setInformation(content);
	}

	/**
	 * Adds a HTML header and CSS info if <code>html</code> is only an HTML fragment (has no
	 * &lt;html&gt; section).
	 *
	 * @param html the html / text produced by a revision
	 * @return modified html
	 */
	private String addCSSToHTMLFragment(String html) {
		int max= Math.min(100, html.length());
		if (html.substring(0, max).indexOf("<html>") != -1) //$NON-NLS-1$
			// there is already a header
			return html;

		StringBuffer info= new StringBuffer(512 + html.length());
		HTMLPrinter.insertPageProlog(info, 0, fgStyleSheet);
		info.append(html);
		HTMLPrinter.addPageEpilog(info);
		return info.toString();
	}
}

 
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