Java tutorial
/** * Copyright 2015-2016 the original author or authors. * * Licensed 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.beryx.viewreka.fxapp.codearea; import javafx.event.EventHandler; import javafx.geometry.Point2D; import javafx.scene.control.ContextMenu; import javafx.scene.control.MenuItem; import javafx.scene.input.KeyCode; import javafx.scene.input.KeyCombination; import javafx.scene.input.KeyEvent; import org.apache.commons.lang3.StringUtils; import org.beryx.viewreka.bundle.api.CodeTemplate; import org.beryx.viewreka.bundle.util.SimpleConfiguration; import org.beryx.viewreka.bundle.util.SimpleContext; import org.beryx.viewreka.core.CodeContext; import org.beryx.viewreka.fxapp.ClassLoaderManager; import org.beryx.viewreka.model.ProjectModel; import org.fxmisc.richtext.PopupAlignment; import org.fxmisc.wellbehaved.event.EventHandlerHelper; import org.fxmisc.wellbehaved.event.EventPattern; import java.util.Arrays; import java.util.Set; import java.util.TreeSet; import java.util.stream.Collectors; /** * Specialization of {@link SimpleCodeArea} for Viewreka scripts. */ public class ViewrekaCodeArea extends SimpleCodeArea { private static final String[] KEYWORDS = new String[] { // groovy keywords "abstract", "any", "as", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue", "def", "default", "do", "double", "else", "enum", "extends", "false", "final", "finally", "float", "for", "goto", "if", "implements", "import", "in", "instanceof", "int", "interface", "it", "long", "native", "new", "null", "package", "private", "protected", "public", "return", "short", "static", "strictfp", "super", "switch", "synchronized", "this", "threadsafe", "throw", "throws", "traits", "transient", "true", "try", "void", "volatile", "while", // viewreka keywords "dataset", "datasource", "view", "parameter", "chart", "styles", "xAxis", "yAxis", "series" }; public static final CodeAreaConfig CONFIG = new CodeAreaConfig().withCaseInsensitive(false) .withKeywords(KEYWORDS); private static final String CARET_MARKER = "\u0000"; private final Set<CodeTemplate> codeTemplates = new TreeSet<>((t1, t2) -> t1.getName().compareTo(t2.getName())); private ClassLoaderManager classLoaderManager; private ProjectModel<?> projectModel; private double[] codeTemplatesCoordinates; public ViewrekaCodeArea() { applyConfiguration(CONFIG); ContextMenu cm = new ContextMenu(); setPopupWindow(cm); setPopupAlignment(PopupAlignment.CARET_BOTTOM); setPopupAnchorOffset(new Point2D(-20, 1)); cm.setOnShown(ev -> codeTemplatesCoordinates = new double[] { cm.getX(), cm.getY() }); EventHandler<? super KeyEvent> tabHandler = EventHandlerHelper .on(EventPattern.keyPressed(KeyCode.SPACE, KeyCombination.CONTROL_DOWN)) .act(ev -> showContextMenu(cm)).create(); EventHandlerHelper.install(onKeyPressedProperty(), tabHandler); } public Set<CodeTemplate> getCodeTemplates() { return codeTemplates; } public void setClassLoaderManager(ClassLoaderManager classLoaderManager) { this.classLoaderManager = classLoaderManager; } public void setProjectModel(ProjectModel<?> projectModel) { this.projectModel = projectModel; } protected void showContextMenu(ContextMenu cm) { if (codeTemplates.isEmpty()) return; cm.getItems().clear(); for (CodeTemplate template : codeTemplates) { // TODO retrieve context and create MenuItem only if template.isAllowedInContext() returns true MenuItem item = new MenuItem(template.getName()); item.setOnAction(ev -> { if (classLoaderManager != null) { classLoaderManager.setProjectClassLoader(); } try { insertCodeFragment(template); } finally { classLoaderManager.resetClassLoader(); } }); cm.getItems().add(item); } cm.getItems() .sort((item1, item2) -> item1.getText().toLowerCase().compareTo(item2.getText().toLowerCase())); cm.show(getScene().getWindow()); } protected CodeContext getCodeTemplateContext() { return new SimpleContext(); } protected CodeTemplate.Configuration getCodeTemplateConfiguration() { return new SimpleConfiguration(projectModel, getCodeTemplateContext(), codeTemplatesCoordinates); } public void insertCodeFragment(CodeTemplate template) { CodeTemplate.CodeFragment fragment = template.getCodeFragment(getCodeTemplateConfiguration()); if (fragment == null) return; String code = fragment.getCode(); if (StringUtils.isBlank(code)) return; int cPos = fragment.getCaretPosition(); if (cPos >= 0) { code = new StringBuilder(code).insert(cPos, CARET_MARKER).toString(); } String[] codeLines = code.split("\\R", -1);// Split around line breaks without discarding empty lines at the end Position startPos = offsetToPosition(getSelection().getStart(), Bias.Forward); int startParagraph = startPos.getMajor(); String textBeforeCaret = getText(startParagraph).substring(0, startPos.getMinor()); boolean shouldIndent = !textBeforeCaret.isEmpty(); if (shouldIndent) { for (char ch : textBeforeCaret.toCharArray()) { if (ch != ' ' && ch != '\t') { shouldIndent = false; break; } } } if (shouldIndent) { for (int i = 1; i < codeLines.length; i++) { codeLines[i] = textBeforeCaret + codeLines[i]; } } code = Arrays.stream(codeLines).collect(Collectors.joining("\n")); replaceSelection(code); if (cPos >= 0) { for (int i = 0; i < codeLines.length; i++) { int markerPos = getText(startParagraph + i).indexOf(CARET_MARKER); if (markerPos >= 0) { int offset = position(startParagraph + i, markerPos).toOffset(); replaceText(offset, offset + CARET_MARKER.length(), ""); break; } } } } }