org.eclipse.lsp4e/src/org/eclipse/lsp4e/operations/hover/FocusableBrowserInformationControl.java - lsp4e/lsp4e - Git at Google

 /*******************************************************************************
  * Copyright (c) 2016, 2020 Red Hat Inc. and others.
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
  * which is available at https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *  Mickael Istria (Red Hat Inc.) - initial implementation
  *******************************************************************************/
 package org.eclipse.lsp4e.operations.hover;

 import java.io.IOException;
 import java.net.URL;

 import org.eclipse.core.runtime.FileLocator;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.jdt.annotation.NonNull;
 import org.eclipse.jdt.annotation.Nullable;
 import org.eclipse.jface.internal.text.html.BrowserInformationControl;
 import org.eclipse.jface.resource.ColorRegistry;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jface.text.DefaultInformationControl;
 import org.eclipse.jface.text.IInformationControlCreator;
 import org.eclipse.lsp4e.LSPEclipseUtils;
 import org.eclipse.lsp4e.LanguageServerPlugin;
 import org.eclipse.swt.browser.Browser;
 import org.eclipse.swt.browser.LocationEvent;
 import org.eclipse.swt.browser.LocationListener;
 import org.eclipse.swt.browser.ProgressListener;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.FontData;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.RGB;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.editors.text.EditorsUI;
 import org.eclipse.ui.texteditor.AbstractDecoratedTextEditorPreferenceConstants;

 @SuppressWarnings("restriction")
 public class FocusableBrowserInformationControl extends BrowserInformationControl {

 	private static final String HEAD = "<head>"; //$NON-NLS-1$

 	private static final LocationListener HYPER_LINK_LISTENER = new LocationListener() {

 		@Override
 		public void changing(LocationEvent event) {
 			if (!"about:blank".equals(event.location)) { //$NON-NLS-1$
 				IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
 				LSPEclipseUtils.open(event.location, page, null);
 				event.doit = false;
 			}
 		}

 		@Override
 		public void changed(LocationEvent event) {
 			// comment requested by sonar
 		}
 	};

 	public FocusableBrowserInformationControl(Shell parent, String symbolicFontName, boolean resizable) {
 		super(parent, JFaceResources.DEFAULT_FONT, resizable);
 	}

 	public FocusableBrowserInformationControl(Shell parent) {
 		super(parent, JFaceResources.DEFAULT_FONT, EditorsUI.getTooltipAffordanceString());
 	}

 	@Override
 	protected void createContent(Composite parent) {
 		super.createContent(parent);
 		Browser b = (Browser) (parent.getChildren()[0]);
 		b.addProgressListener(ProgressListener.completedAdapter(event -> {
 			if (getInput() == null)
 				return;
 			Browser browser = (Browser) event.getSource();
 			@Nullable
 			Point constraints = getSizeConstraints();
 			Point hint = computeSizeHint();

 			setSize(hint.x, hint.y);
 			browser.execute("document.getElementsByTagName(\"html\")[0].style.whiteSpace = \"nowrap\""); //$NON-NLS-1$
 			Double width = 20 + (Double) browser.evaluate("return document.body.scrollWidth;"); //$NON-NLS-1$

 			setSize(width.intValue(), hint.y);
 			browser.execute("document.getElementsByTagName(\"html\")[0].style.whiteSpace = \"normal\""); //$NON-NLS-1$
 			Double height = (Double) browser.evaluate("return document.body.scrollHeight;"); //$NON-NLS-1$
 			if (Platform.getPreferencesService().getBoolean(EditorsUI.PLUGIN_ID,
 					AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_TEXT_HOVER_AFFORDANCE, true,
 					null)) {
 				FontData[] fontDatas = JFaceResources.getDialogFont().getFontData();
 				height = fontDatas[0].getHeight() + height;
 			}

 			width = Double.valueOf(width * 1.5);
 			if (constraints != null && constraints.x < width) {
 				width = (double) constraints.x;
 			}
 			if (constraints != null && constraints.y < height) {
 				height = (double) constraints.y;
 			}

 			setSize(width.intValue(), height.intValue());
 		}));
 		b.setJavascriptEnabled(true);
 	}

 	@Override
 	public void setInput(Object input) {
 		if (input instanceof String) {
 			input = styleHtml((String)input);
 		}
 		super.setInput(input);
 	}

 	public String styleHtml(String html) {
 		if (html == null || html.isEmpty()) {
 			return html;
 		}

 		// put CSS styling to match Eclipse style
 		ColorRegistry colorRegistry = JFaceResources.getColorRegistry();
 		Color foreground = colorRegistry.get("org.eclipse.ui.workbench.HOVER_FOREGROUND"); //$NON-NLS-1$
 		Color background = colorRegistry.get("org.eclipse.ui.workbench.HOVER_BACKGROUND"); //$NON-NLS-1$
 		String style = "<style TYPE='text/css'>html { " + //$NON-NLS-1$
 				"font-family: " + JFaceResources.getDefaultFontDescriptor().getFontData()[0].getName() + "; " + //$NON-NLS-1$ //$NON-NLS-2$
 				"font-size: " + Integer.toString(JFaceResources.getDefaultFontDescriptor().getFontData()[0].getHeight()) //$NON-NLS-1$
 				+ "pt; " + //$NON-NLS-1$
 				(background != null ? "background-color: " + toHTMLrgb(background.getRGB()) + "; " : "") + //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 				(foreground != null ? "color: " + toHTMLrgb(foreground.getRGB()) + "; " : "") + //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 				" }</style>"; //$NON-NLS-1$

 		String hlStyle = null;
 		try {
 			URL urlHJScript = FileLocator.toFileURL(LanguageServerPlugin.getDefault().getClass().getResource("/resources/highlight.min.js/highlight.min.js")); //$NON-NLS-1$
 			URL urlHJCss = FileLocator.toFileURL(LanguageServerPlugin.getDefault().getClass().getResource(isDarkTheme() ? //
 					"/resources/highlight.min.js/styles/dark.min.css" : //$NON-NLS-1$
 					"/resources/highlight.min.js/styles/default.min.css")); //$NON-NLS-1$
 			if (urlHJScript != null && urlHJCss != null) {
 				hlStyle = "<link rel='stylesheet' href='" + urlHJCss.toString() + "'>" + //$NON-NLS-1$ //$NON-NLS-2$
 						"<script src='" + urlHJScript.toString() + "'></script>" + //$NON-NLS-1$ //$NON-NLS-2$
 						"<script>hljs.highlightAll();</script>"; //$NON-NLS-1$
 			}
 		} catch (IOException e) {
 			LanguageServerPlugin.logError(e);
 		}

 		int headIndex = html.indexOf(HEAD);
 		StringBuilder builder = new StringBuilder(html.length() + style.length());
 		builder.append(html.substring(0, headIndex + HEAD.length()));
 		builder.append(style);
 		if (hlStyle != null) {
 			builder.append(hlStyle);
 		}
 		builder.append(html.substring(headIndex + HEAD.length()));
 		return builder.toString();
 	}

 	private boolean isDarkTheme() {
 		RGB color = getShell().getBackground().getRGB();
 		return (color.red * 0.299 + color.green * 0.587+ color.blue *0.114) < 128; //turn to grey and check the level
 	}

 	private static @NonNull String toHTMLrgb(RGB rgb) {
 		StringBuilder builder = new StringBuilder(7);
 		builder.append('#');
 		appendAsHexString(builder, rgb.red);
 		appendAsHexString(builder, rgb.green);
 		appendAsHexString(builder, rgb.blue);
 		return builder.toString();
 	}

 	private static void appendAsHexString(StringBuilder buffer, int intValue) {
 		String hexValue= Integer.toHexString(intValue);
 		if (hexValue.length() == 1) {
 			buffer.append('0');
 		}
 		buffer.append(hexValue);
 	}

 	@Override
 	public IInformationControlCreator getInformationPresenterControlCreator() {
 		return parent -> {
 			if (BrowserInformationControl.isAvailable(parent)) {
 				BrowserInformationControl res = new FocusableBrowserInformationControl(parent, JFaceResources.DEFAULT_FONT,
 						true);
 				res.addLocationListener(HYPER_LINK_LISTENER);
 				return res;
 			} else {
 				return new DefaultInformationControl(parent);
 			}
 		};
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2016, 2020 Red Hat Inc. and others.
	* This program and the accompanying materials are made
	* available under the terms of the Eclipse Public License 2.0
	* which is available at https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* Mickael Istria (Red Hat Inc.) - initial implementation
	*******************************************************************************/
	package org.eclipse.lsp4e.operations.hover;

	import java.io.IOException;
	import java.net.URL;

	import org.eclipse.core.runtime.FileLocator;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.jdt.annotation.NonNull;
	import org.eclipse.jdt.annotation.Nullable;
	import org.eclipse.jface.internal.text.html.BrowserInformationControl;
	import org.eclipse.jface.resource.ColorRegistry;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jface.text.DefaultInformationControl;
	import org.eclipse.jface.text.IInformationControlCreator;
	import org.eclipse.lsp4e.LSPEclipseUtils;
	import org.eclipse.lsp4e.LanguageServerPlugin;
	import org.eclipse.swt.browser.Browser;
	import org.eclipse.swt.browser.LocationEvent;
	import org.eclipse.swt.browser.LocationListener;
	import org.eclipse.swt.browser.ProgressListener;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.FontData;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.RGB;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.ui.IWorkbenchPage;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.editors.text.EditorsUI;
	import org.eclipse.ui.texteditor.AbstractDecoratedTextEditorPreferenceConstants;

	@SuppressWarnings("restriction")
	public class FocusableBrowserInformationControl extends BrowserInformationControl {

	private static final String HEAD = "<head>"; //$NON-NLS-1$

	private static final LocationListener HYPER_LINK_LISTENER = new LocationListener() {

	@Override
	public void changing(LocationEvent event) {
	if (!"about:blank".equals(event.location)) { //$NON-NLS-1$
	IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
	LSPEclipseUtils.open(event.location, page, null);
	event.doit = false;
	}
	}

	@Override
	public void changed(LocationEvent event) {
	// comment requested by sonar
	}
	};

	public FocusableBrowserInformationControl(Shell parent, String symbolicFontName, boolean resizable) {
	super(parent, JFaceResources.DEFAULT_FONT, resizable);
	}

	public FocusableBrowserInformationControl(Shell parent) {
	super(parent, JFaceResources.DEFAULT_FONT, EditorsUI.getTooltipAffordanceString());
	}

	@Override
	protected void createContent(Composite parent) {
	super.createContent(parent);
	Browser b = (Browser) (parent.getChildren()[0]);
	b.addProgressListener(ProgressListener.completedAdapter(event -> {
	if (getInput() == null)
	return;
	Browser browser = (Browser) event.getSource();
	@Nullable
	Point constraints = getSizeConstraints();
	Point hint = computeSizeHint();

	setSize(hint.x, hint.y);
	browser.execute("document.getElementsByTagName(\"html\")[0].style.whiteSpace = \"nowrap\""); //$NON-NLS-1$
	Double width = 20 + (Double) browser.evaluate("return document.body.scrollWidth;"); //$NON-NLS-1$

	setSize(width.intValue(), hint.y);
	browser.execute("document.getElementsByTagName(\"html\")[0].style.whiteSpace = \"normal\""); //$NON-NLS-1$
	Double height = (Double) browser.evaluate("return document.body.scrollHeight;"); //$NON-NLS-1$
	if (Platform.getPreferencesService().getBoolean(EditorsUI.PLUGIN_ID,
	AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_TEXT_HOVER_AFFORDANCE, true,
	null)) {
	FontData[] fontDatas = JFaceResources.getDialogFont().getFontData();
	height = fontDatas[0].getHeight() + height;
	}

	width = Double.valueOf(width * 1.5);
	if (constraints != null && constraints.x < width) {
	width = (double) constraints.x;
	}
	if (constraints != null && constraints.y < height) {
	height = (double) constraints.y;
	}

	setSize(width.intValue(), height.intValue());
	}));
	b.setJavascriptEnabled(true);
	}

	@Override
	public void setInput(Object input) {
	if (input instanceof String) {
	input = styleHtml((String)input);
	}
	super.setInput(input);
	}

	public String styleHtml(String html) {
	if (html == null \|\| html.isEmpty()) {
	return html;
	}

	// put CSS styling to match Eclipse style
	ColorRegistry colorRegistry = JFaceResources.getColorRegistry();
	Color foreground = colorRegistry.get("org.eclipse.ui.workbench.HOVER_FOREGROUND"); //$NON-NLS-1$
	Color background = colorRegistry.get("org.eclipse.ui.workbench.HOVER_BACKGROUND"); //$NON-NLS-1$
	String style = "<style TYPE='text/css'>html { " + //$NON-NLS-1$
	"font-family: " + JFaceResources.getDefaultFontDescriptor().getFontData()[0].getName() + "; " + //$NON-NLS-1$ //$NON-NLS-2$
	"font-size: " + Integer.toString(JFaceResources.getDefaultFontDescriptor().getFontData()[0].getHeight()) //$NON-NLS-1$
	+ "pt; " + //$NON-NLS-1$
	(background != null ? "background-color: " + toHTMLrgb(background.getRGB()) + "; " : "") + //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	(foreground != null ? "color: " + toHTMLrgb(foreground.getRGB()) + "; " : "") + //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	" }</style>"; //$NON-NLS-1$

	String hlStyle = null;
	try {
	URL urlHJScript = FileLocator.toFileURL(LanguageServerPlugin.getDefault().getClass().getResource("/resources/highlight.min.js/highlight.min.js")); //$NON-NLS-1$
	URL urlHJCss = FileLocator.toFileURL(LanguageServerPlugin.getDefault().getClass().getResource(isDarkTheme() ? //
	"/resources/highlight.min.js/styles/dark.min.css" : //$NON-NLS-1$
	"/resources/highlight.min.js/styles/default.min.css")); //$NON-NLS-1$
	if (urlHJScript != null && urlHJCss != null) {
	hlStyle = "<link rel='stylesheet' href='" + urlHJCss.toString() + "'>" + //$NON-NLS-1$ //$NON-NLS-2$
	"<script src='" + urlHJScript.toString() + "'></script>" + //$NON-NLS-1$ //$NON-NLS-2$
	"<script>hljs.highlightAll();</script>"; //$NON-NLS-1$
	}
	} catch (IOException e) {
	LanguageServerPlugin.logError(e);
	}

	int headIndex = html.indexOf(HEAD);
	StringBuilder builder = new StringBuilder(html.length() + style.length());
	builder.append(html.substring(0, headIndex + HEAD.length()));
	builder.append(style);
	if (hlStyle != null) {
	builder.append(hlStyle);
	}
	builder.append(html.substring(headIndex + HEAD.length()));
	return builder.toString();
	}

	private boolean isDarkTheme() {
	RGB color = getShell().getBackground().getRGB();
	return (color.red * 0.299 + color.green * 0.587+ color.blue *0.114) < 128; //turn to grey and check the level
	}

	private static @NonNull String toHTMLrgb(RGB rgb) {
	StringBuilder builder = new StringBuilder(7);
	builder.append('#');
	appendAsHexString(builder, rgb.red);
	appendAsHexString(builder, rgb.green);
	appendAsHexString(builder, rgb.blue);
	return builder.toString();
	}

	private static void appendAsHexString(StringBuilder buffer, int intValue) {
	String hexValue= Integer.toHexString(intValue);
	if (hexValue.length() == 1) {
	buffer.append('0');
	}
	buffer.append(hexValue);
	}

	@Override
	public IInformationControlCreator getInformationPresenterControlCreator() {
	return parent -> {
	if (BrowserInformationControl.isAvailable(parent)) {
	BrowserInformationControl res = new FocusableBrowserInformationControl(parent, JFaceResources.DEFAULT_FONT,
	true);
	res.addLocationListener(HYPER_LINK_LISTENER);
	return res;
	} else {
	return new DefaultInformationControl(parent);
	}
	};
	}

	}