Java tutorial
/***************************************************************** * 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.cayenne.swing.components.textpane; import java.awt.Color; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Image; import java.awt.Point; import java.awt.Rectangle; import java.awt.event.MouseEvent; import javax.swing.BorderFactory; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextPane; import javax.swing.JViewport; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.text.BadLocationException; import javax.swing.text.Document; import javax.swing.text.Highlighter; import javax.swing.text.JTextComponent; import org.apache.cayenne.modeler.Main; import org.apache.cayenne.modeler.util.ModelerUtil; import org.apache.cayenne.swing.components.textpane.syntax.SQLSyntaxConstants; import org.apache.cayenne.swing.components.textpane.syntax.SyntaxConstant; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class JCayenneTextPane extends JPanel { protected Highlighter.HighlightPainter painter; private JTextPaneScrollable pane; private JScrollPane scrollPane; private boolean imageError; private String tooltipTextError; private int startYPositionToolTip; private int endYPositionToolTip; public boolean repaint; public JScrollPane getScrollPane() { return scrollPane; } public String getTooltipTextError() { return tooltipTextError; } public void setTooltipTextError(String tooltipTextError) { this.tooltipTextError = tooltipTextError; } private static Log logObj = LogFactory.getLog(Main.class); public void setText(String text) { pane.setText(text); } public String getText() { return pane.getText(); } public JTextComponent getPane() { return pane; } public int getStartPositionInDocument() { return pane.viewToModel(scrollPane.getViewport().getViewPosition()); // starting pos // in document } public int getEndPositionInDocument() { return pane.viewToModel(new Point(scrollPane.getViewport().getViewPosition().x + pane.getWidth(), scrollPane.getViewport().getViewPosition().y + pane.getHeight())); } public void repaintPane() { pane.repaint(); } /** * Return an int containing the wrapped line index at the given position * * @param int pos * @return int */ public int getLineNumber(int pos) { int posLine; int y = 0; try { Rectangle caretCoords = pane.modelToView(pos); y = (int) caretCoords.getY(); } catch (BadLocationException ex) { logObj.warn("Error: ", ex); } int lineHeight = pane.getFontMetrics(pane.getFont()).getHeight(); posLine = (y / lineHeight) + 1; return posLine; } /** * Return an int position at the given line number and symbol position in this line * * @param int posInLine * @param int line * @return int * @throws BadLocationException */ public int getPosition(int line, int posInLine) throws BadLocationException { // translate lines to offsets int position = -1; int numrows = 1; char[] chararr = pane.getText().toCharArray(); for (int i = 0; i < chararr.length; i++) { if (chararr[i] == '\n') { numrows++; if (numrows == line) { position = i; break; } } } return position + posInLine; } public JCayenneTextPane(SyntaxConstant syntaxConstant) { super(); Dimension dimention = new Dimension(15, 15); setMinimumSize(dimention); setPreferredSize(dimention); setMinimumSize(dimention); setBackground(new Color(245, 238, 238)); setBorder(null); pane = new JTextPaneScrollable(new EditorKit(syntaxConstant)) { public void paint(Graphics g) { super.paint(g); JCayenneTextPane.this.repaint(); } }; pane.setFont(SQLSyntaxConstants.DEFAULT_FONT); pane.setBorder(new LineNumberedBorder(this)); scrollPane = new JScrollPane(pane); scrollPane.setBorder(BorderFactory.createLineBorder(new Color(115, 115, 115))); this.painter = new UnderlineHighlighterForText.UnderlineHighlightPainter(Color.red); pane.getDocument().addDocumentListener(new DocumentListener() { public void insertUpdate(DocumentEvent evt) { try { String text = pane.getText(evt.getOffset(), 1).toString(); if (text.equals("/") || text.equals("*")) { removeHighlightText(); pane.repaint(); } if (text.equals(" ") || text.equals("\t") || text.equals("\n")) { pane.repaint(); } } catch (Exception e) { logObj.warn("Error: ", e); } } public void removeUpdate(DocumentEvent evt) { } public void changedUpdate(DocumentEvent evt) { } }); } public void setHighlightText(int lastIndex, int endIndex) throws BadLocationException { Highlighter highlighter = pane.getHighlighter(); removeHighlightText(highlighter); highlighter.addHighlight(lastIndex, endIndex, painter); } /** * set underlines text in JCayenneTextPane * * @param int line - starting line for underlined text * @param int lastIndex - starting position in line for underlined text * @param int size * @param String message - text for toolTip, contains the text of the error */ public void setHighlightText(int line, int lastIndex, int size, String message) { Highlighter highlighter = pane.getHighlighter(); removeHighlightText(highlighter); if (getText().length() > 0) { try { int position = getPosition(line, lastIndex); int positionEnd = position + size; highlighter.addHighlight(position, positionEnd, painter); setToolTipPosition(line, message); repaintPane(); } catch (BadLocationException e) { logObj.warn("Error: ", e); } } else { setToolTipPosition(0, ""); } } public void removeHighlightText(Highlighter highlighter) { Highlighter.Highlight[] highlights = highlighter.getHighlights(); for (int i = 0; i < highlights.length; i++) { Highlighter.Highlight h = highlights[i]; if (h.getPainter() instanceof UnderlineHighlighterForText.UnderlineHighlightPainter) { highlighter.removeHighlight(h); } } } public void setToolTipPosition(int line, String string) { if (line != 0) { int height = pane.getFontMetrics(pane.getFont()).getHeight(); int start = (line - 1) * height; this.endYPositionToolTip = start; this.startYPositionToolTip = start + height; setTooltipTextError(string); if (string != "") { imageError = true; } else { imageError = false; } setToolTipText(""); } else { this.endYPositionToolTip = -1; this.startYPositionToolTip = -1; setTooltipTextError(""); setToolTipText(""); imageError = false; } } public String getToolTipText(MouseEvent e) { if (e.getPoint().y > endYPositionToolTip && e.getPoint().y < startYPositionToolTip && imageError) { setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); String htmlText = getTooltipTextError().replaceAll("\n", "<br> ").replaceAll("\t", " ") .replaceAll("\r", "<br> "); return "<HTML>" + "<body bgcolor='#FFEBCD' text='black'>" + htmlText + "</body>"; } else { setCursor(Cursor.getDefaultCursor()); return null; } } public void removeHighlightText() { imageError = false; Highlighter highlighter = pane.getHighlighter(); removeHighlightText(highlighter); } public int getCaretPosition() { return pane.getCaretPosition(); } public void paint(Graphics g) { super.paint(g); int start = getStartPositionInDocument(); int end = getEndPositionInDocument(); // end pos in doc // translate offsets to lines Document doc = pane.getDocument(); int startline = doc.getDefaultRootElement().getElementIndex(start) + 1; int endline = doc.getDefaultRootElement().getElementIndex(end) + 1; int fontHeight = g.getFontMetrics(pane.getFont()).getHeight(); int fontDesc = g.getFontMetrics(pane.getFont()).getDescent(); int starting_y = -1; try { if (pane.modelToView(start) == null) { starting_y = -1; } else { starting_y = pane.modelToView(start).y - scrollPane.getViewport().getViewPosition().y + fontHeight - fontDesc; } } catch (Exception e1) { logObj.warn("Error: ", e1); } for (int line = startline, y = starting_y; line <= endline; y += fontHeight, line++) { Color color = g.getColor(); if (line - 1 == doc.getDefaultRootElement().getElementIndex(pane.getCaretPosition())) { g.setColor(new Color(224, 224, 255)); g.fillRect(0, y - fontHeight + 3, 30, fontHeight + 1); } if (imageError) { Image img = ModelerUtil.buildIcon("error.gif").getImage(); g.drawImage(img, 0, endYPositionToolTip, this); } g.setColor(color); } } public Document getDocument() { return pane.getDocument(); } class JTextPaneScrollable extends JTextPane { public JTextPaneScrollable(EditorKit editorKit) { // Set editor kit this.setEditorKitForContentType(editorKit.getContentType(), editorKit); this.setContentType(editorKit.getContentType()); } @Override public boolean getScrollableTracksViewportWidth() { if (getParent() instanceof JViewport) { JViewport port = (JViewport) getParent(); if (port.getWidth() > getUI().getPreferredSize(this).width) { return true; } } return false; } @Override public void paintComponent(Graphics g) { super.paintComponent(g); } } }