| /******************************************************************************* |
| * Copyright (c) 2000, 2017 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| *******************************************************************************/ |
| package org.eclipse.dltk.internal.ui.text; |
| |
| import java.io.IOException; |
| import java.io.StringReader; |
| import java.util.Iterator; |
| |
| import org.eclipse.dltk.internal.ui.DLTKUIMessages; |
| import org.eclipse.dltk.ui.DLTKUIPlugin; |
| import org.eclipse.jface.text.DefaultInformationControl; |
| import org.eclipse.jface.text.Region; |
| import org.eclipse.jface.text.TextPresentation; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.custom.StyleRange; |
| import org.eclipse.swt.graphics.Drawable; |
| import org.eclipse.swt.graphics.Font; |
| import org.eclipse.swt.graphics.FontData; |
| import org.eclipse.swt.graphics.GC; |
| import org.eclipse.swt.widgets.Display; |
| |
| public class HTMLTextPresenter implements DefaultInformationControl.IInformationPresenter, DefaultInformationControl.IInformationPresenterExtension { |
| |
| private static final String LINE_DELIM= System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$ |
| |
| private int fCounter; |
| private boolean fEnforceUpperLineLimit; |
| |
| /** |
| * Enables using bold font in order not to clip the text. |
| * <p> |
| * <em>Enabling this is a hack.</em> |
| * |
| * |
| */ |
| private boolean fUseBoldFont= false; |
| |
| public HTMLTextPresenter(boolean enforceUpperLineLimit) { |
| super(); |
| fEnforceUpperLineLimit= enforceUpperLineLimit; |
| } |
| |
| public HTMLTextPresenter() { |
| this(true); |
| } |
| |
| protected HTML2TextReader createReader(String hoverInfo, TextPresentation presentation) { |
| return new HTML2TextReader(new StringReader(hoverInfo), presentation); |
| } |
| |
| protected void adaptTextPresentation(TextPresentation presentation, int offset, int insertLength) { |
| |
| int yoursStart= offset; |
| int yoursEnd= offset + insertLength -1; |
| yoursEnd= Math.max(yoursStart, yoursEnd); |
| |
| Iterator e= presentation.getAllStyleRangeIterator(); |
| while (e.hasNext()) { |
| |
| StyleRange range= (StyleRange) e.next(); |
| |
| int myStart= range.start; |
| int myEnd= range.start + range.length -1; |
| myEnd= Math.max(myStart, myEnd); |
| |
| if (myEnd < yoursStart) |
| continue; |
| |
| if (myStart < yoursStart) |
| range.length += insertLength; |
| else |
| range.start += insertLength; |
| } |
| } |
| |
| private void append(StringBuffer buffer, String string, TextPresentation presentation) { |
| |
| int length= string.length(); |
| buffer.append(string); |
| |
| if (presentation != null) |
| adaptTextPresentation(presentation, fCounter, length); |
| |
| fCounter += length; |
| } |
| |
| private String getIndent(String line) { |
| int length= line.length(); |
| |
| int i= 0; |
| while (i < length && Character.isWhitespace(line.charAt(i))) ++i; |
| |
| return (i == length ? line : line.substring(0, i)) + " "; //$NON-NLS-1$ |
| } |
| |
| @Override |
| public String updatePresentation(Display display, String hoverInfo, TextPresentation presentation, int maxWidth, int maxHeight) { |
| return updatePresentation((Drawable)display, hoverInfo, presentation, maxWidth, maxHeight); |
| } |
| |
| @Override |
| public String updatePresentation(Drawable drawable, String hoverInfo, TextPresentation presentation, int maxWidth, int maxHeight) { |
| |
| if (hoverInfo == null) |
| return null; |
| |
| GC gc= new GC(drawable); |
| |
| Font font= null; |
| if (fUseBoldFont) { |
| font= gc.getFont(); |
| FontData[] fontData= font.getFontData(); |
| for (int i= 0; i < fontData.length; i++) |
| fontData[i].setStyle(SWT.BOLD); |
| font= new Font(gc.getDevice(), fontData); |
| gc.setFont(font); |
| } |
| |
| try { |
| |
| StringBuffer buffer= new StringBuffer(); |
| int maxNumberOfLines= Math.round((float)maxHeight / gc.getFontMetrics().getHeight()); |
| |
| fCounter= 0; |
| LineBreakingReader reader= new LineBreakingReader(createReader(hoverInfo, presentation), gc, maxWidth); |
| |
| boolean lastLineFormatted= false; |
| String lastLineIndent= null; |
| |
| String line=reader.readLine(); |
| boolean lineFormatted= reader.isFormattedLine(); |
| boolean firstLineProcessed= false; |
| |
| while (line != null) { |
| |
| if (fEnforceUpperLineLimit && maxNumberOfLines <= 0) |
| break; |
| |
| if (firstLineProcessed) { |
| if (!lastLineFormatted) |
| append(buffer, LINE_DELIM, null); |
| else { |
| append(buffer, LINE_DELIM, presentation); |
| if (lastLineIndent != null) |
| append(buffer, lastLineIndent, presentation); |
| } |
| } |
| |
| append(buffer, line, null); |
| firstLineProcessed= true; |
| |
| lastLineFormatted= lineFormatted; |
| if (!lineFormatted) |
| lastLineIndent= null; |
| else if (lastLineIndent == null) |
| lastLineIndent= getIndent(line); |
| |
| line= reader.readLine(); |
| lineFormatted= reader.isFormattedLine(); |
| |
| maxNumberOfLines--; |
| } |
| |
| if (line != null && buffer.length() > 0) { |
| append(buffer, LINE_DELIM, lineFormatted ? presentation : null); |
| append(buffer, DLTKUIMessages.HTMLTextPresenter_ellipsis, presentation); |
| } |
| |
| return trim(buffer, presentation); |
| |
| } catch (IOException e) { |
| |
| DLTKUIPlugin.log(e); |
| return null; |
| |
| } finally { |
| if (font != null) |
| font.dispose(); |
| gc.dispose(); |
| } |
| } |
| |
| private String trim(StringBuffer buffer, TextPresentation presentation) { |
| |
| int length= buffer.length(); |
| |
| int end= length -1; |
| while (end >= 0 && Character.isWhitespace(buffer.charAt(end))) |
| -- end; |
| |
| if (end == -1) |
| return ""; //$NON-NLS-1$ |
| |
| if (end < length -1) |
| buffer.delete(end + 1, length); |
| else |
| end= length; |
| |
| int start= 0; |
| while (start < end && Character.isWhitespace(buffer.charAt(start))) |
| ++ start; |
| |
| buffer.delete(0, start); |
| presentation.setResultWindow(new Region(start, buffer.length())); |
| return buffer.toString(); |
| } |
| } |
| |