Java tutorial
/******************************************************************************* * Copyright (c) 2016 Red Hat Inc. 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 * * Contributors: * Red Hat Inc. - initial API and implementation *******************************************************************************/ package org.eclipse.cdt.internal.autotools.ui.editors; import org.eclipse.cdt.autotools.ui.editors.AutoconfEditor; import org.eclipse.cdt.autotools.ui.editors.outline.AutoconfContentProvider; import org.eclipse.cdt.autotools.ui.editors.outline.AutoconfLabelProvider; import org.eclipse.cdt.autotools.ui.editors.parser.AutoconfElement; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.PopupDialog; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.viewers.AbstractTreeViewer; import org.eclipse.jface.viewers.ILabelProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.FontMetrics; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.Tree; import org.eclipse.ui.editors.text.TextEditor; import org.eclipse.ui.views.contentoutline.IContentOutlinePage; public class QuickOutlineDialog extends PopupDialog { TreeViewer treeViewer; private Text filterText; private TextEditor editor; private ContainsFilter treeViewerFilter; public QuickOutlineDialog(Shell parent, int shellStyle, AutoconfEditor editor) { super(parent, shellStyle, true, true, true, true, true, null, null); this.editor = editor; create(); } public void setVisible(boolean visible) { if (visible) { open(); filterText.setFocus(); } else { saveDialogBounds(getShell()); getShell().setVisible(false); } } public void dispose() { close(); } @Override protected Control createDialogArea(Composite parent) { createUIWidgetTreeViewer(parent); createUIListenersTreeViewer(); return treeViewer.getControl(); } @Override protected Control createTitleControl(Composite parent) { filterText = new Text(parent, SWT.NONE); GC gc = new GC(parent); gc.setFont(parent.getFont()); FontMetrics fontMetrics = gc.getFontMetrics(); gc.dispose(); GridDataFactory.fillDefaults().align(SWT.FILL, SWT.CENTER).grab(true, false) .hint(SWT.DEFAULT, Dialog.convertHeightInCharsToPixels(fontMetrics, 1)).applyTo(filterText); filterText.addKeyListener(new KeyAdapter() { @Override public void keyPressed(KeyEvent e) { if (e.keyCode == 0x0D) { // Enter pressed gotoSelectedElement(); } else if (e.keyCode == SWT.ARROW_DOWN) { treeViewer.getTree().setFocus(); } else if (e.keyCode == SWT.ARROW_UP) { treeViewer.getTree().setFocus(); } else if (e.character == 0x1B) { // Escape pressed dispose(); } } }); filterText.addModifyListener(e -> { String filterTextInput = ((Text) e.widget).getText().toLowerCase(); treeViewerFilter.setLookFor(filterTextInput); stringMatcherUpdated(); }); return filterText; } private void stringMatcherUpdated() { treeViewer.getControl().setRedraw(false); treeViewer.refresh(); treeViewer.expandAll(); if (treeViewer.getTree().getTopItem() != null && treeViewer.getTree().getTopItem().getItemCount() > 0) { treeViewer.getTree().select(treeViewer.getTree().getTopItem().getItem(0)); } else if (treeViewer.getTree().getItemCount() > 0) { treeViewer.getTree().select(treeViewer.getTree().getItem(0)); } treeViewer.getControl().setRedraw(true); } private void createUIWidgetTreeViewer(Composite parent) { final int style = SWT.H_SCROLL | SWT.V_SCROLL; final Tree widget = new Tree(parent, style); final GridData data = new GridData(GridData.FILL_BOTH); data.heightHint = widget.getItemHeight() * 12; widget.setLayoutData(data); treeViewer = new TreeViewer(widget); treeViewerFilter = new ContainsFilter(); treeViewer.addFilter(treeViewerFilter); ITreeContentProvider fOutlineContentProvider = new AutoconfContentProvider(editor); ILabelProvider fTreeLabelProvider = new AutoconfLabelProvider(); treeViewer.setContentProvider(fOutlineContentProvider); treeViewer.setLabelProvider(fTreeLabelProvider); treeViewer.setAutoExpandLevel(AbstractTreeViewer.ALL_LEVELS); treeViewer.setUseHashlookup(true); treeViewer.setInput(editor.getAdapter(IContentOutlinePage.class)); } private void createUIListenersTreeViewer() { final Tree tree = treeViewer.getTree(); tree.addSelectionListener(new SelectionAdapter() { @Override public void widgetDefaultSelected(SelectionEvent e) { gotoSelectedElement(); } }); } private void gotoSelectedElement() { if (editor instanceof AutoconfEditor) { final AutoconfElement curElement = (AutoconfElement) getSelectedElement(); if (curElement == null) { return; } dispose(); editor.setHighlightRange(curElement.getStartOffset(), curElement.getLength(), true); } } private Object getSelectedElement() { if (treeViewer == null) { return null; } return ((IStructuredSelection) treeViewer.getSelection()).getFirstElement(); } }