Java tutorial
/* * Copyright (c) 2012, the Dart project authors. * * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html * * 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 com.google.dart.tools.search2.internal.ui; import com.google.dart.tools.search.internal.ui.SearchPlugin; import com.google.dart.tools.search.internal.ui.util.SWTUtil; import com.google.dart.tools.search.ui.ISearchQuery; import com.google.dart.tools.search.ui.ISearchResult; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.ui.dialogs.SelectionDialog; import java.util.ArrayList; import java.util.Iterator; import java.util.List; /** * Dialog that shows a list of items with icon and label. */ public class SearchHistorySelectionDialog extends SelectionDialog { private static final class SearchesLabelProvider extends LabelProvider { private ArrayList<Image> fImages = new ArrayList<Image>(); @Override public void dispose() { Iterator<Image> iter = fImages.iterator(); while (iter.hasNext()) { iter.next().dispose(); } fImages = null; } @Override public Image getImage(Object element) { ImageDescriptor imageDescriptor = ((ISearchResult) element).getImageDescriptor(); if (imageDescriptor == null) { return null; } Image image = imageDescriptor.createImage(); fImages.add(image); return image; } @Override public String getText(Object element) { return ((ISearchResult) element).getLabel(); } } private static final int REMOVE_ID = IDialogConstants.CLIENT_ID + 1; private static final int WIDTH_IN_CHARACTERS = 55; private List<ISearchResult> fInput; private final List<Object> fRemovedEntries; private TableViewer fViewer; private Button fRemoveButton; public SearchHistorySelectionDialog(Shell parent, List<ISearchResult> input) { super(parent); setTitle(SearchMessages.SearchesDialog_title); setMessage(SearchMessages.SearchesDialog_message); fInput = input; fRemovedEntries = new ArrayList<Object>(); setHelpAvailable(false); } @Override public void create() { super.create(); List<?> initialSelection = getInitialElementSelections(); if (initialSelection != null) { fViewer.setSelection(new StructuredSelection(initialSelection)); } validateDialogState(); } @Override protected void buttonPressed(int buttonId) { if (buttonId == REMOVE_ID) { IStructuredSelection selection = (IStructuredSelection) fViewer.getSelection(); Iterator<?> searchResults = selection.iterator(); while (searchResults.hasNext()) { Object curr = searchResults.next(); fRemovedEntries.add(curr); fInput.remove(curr); fViewer.remove(curr); } if (fViewer.getSelection().isEmpty() && !fInput.isEmpty()) { fViewer.setSelection(new StructuredSelection(fInput.get(0))); } return; } super.buttonPressed(buttonId); } @Override protected void createButtonsForButtonBar(Composite parent) { createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OPEN_LABEL, true); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); } @Override protected Control createDialogArea(Composite container) { Composite ancestor = (Composite) super.createDialogArea(container); createMessageArea(ancestor); Composite parent = new Composite(ancestor, SWT.NONE); GridLayout layout = new GridLayout(); layout.numColumns = 2; layout.marginHeight = 0; layout.marginWidth = 0; parent.setLayout(layout); parent.setLayoutData(new GridData(GridData.FILL_BOTH)); fViewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER | SWT.FULL_SELECTION); fViewer.setContentProvider(new ArrayContentProvider()); final Table table = fViewer.getTable(); table.addMouseListener(new MouseAdapter() { @Override public void mouseDoubleClick(MouseEvent e) { okPressed(); } }); fViewer.setLabelProvider(new SearchesLabelProvider()); GridData gd = new GridData(GridData.FILL_BOTH); gd.heightHint = convertHeightInCharsToPixels(15); gd.widthHint = convertWidthInCharsToPixels(WIDTH_IN_CHARACTERS); table.setLayoutData(gd); fRemoveButton = new Button(parent, SWT.PUSH); fRemoveButton.setText(SearchMessages.SearchesDialog_remove_label); fRemoveButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent event) { buttonPressed(REMOVE_ID); } }); fRemoveButton.setLayoutData(new GridData(GridData.BEGINNING, GridData.BEGINNING, false, false)); SWTUtil.setButtonDimensionHint(fRemoveButton); fViewer.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { validateDialogState(); } }); applyDialogFont(ancestor); // set input & selections last, so all the widgets are created. fViewer.setInput(fInput); fViewer.getTable().setFocus(); return ancestor; } @Override protected Label createMessageArea(Composite composite) { Composite parent = new Composite(composite, SWT.NONE); GridLayout layout = new GridLayout(); layout.numColumns = 2; layout.marginHeight = 0; layout.marginWidth = 0; parent.setLayout(layout); parent.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Label label = new Label(parent, SWT.WRAP); label.setText(getMessage()); GridData gd = new GridData(GridData.FILL_HORIZONTAL); //gd.widthHint= convertWidthInCharsToPixels(WIDTH_IN_CHARACTERS); label.setLayoutData(gd); applyDialogFont(label); return label; } @Override protected IDialogSettings getDialogBoundsSettings() { return SearchPlugin.getDefault().getDialogSettingsSection("DialogBounds_SearchHistorySelectionDialog"); //$NON-NLS-1$ } @Override protected int getDialogBoundsStrategy() { return DIALOG_PERSISTSIZE; } @Override protected void okPressed() { // Build a list of selected children. ISelection selection = fViewer.getSelection(); if (selection instanceof IStructuredSelection) { setResult(((IStructuredSelection) fViewer.getSelection()).toList()); } // remove queries for (Iterator<Object> iter = fRemovedEntries.iterator(); iter.hasNext();) { ISearchResult result = (ISearchResult) iter.next(); ISearchQuery query = result.getQuery(); if (query != null) { // must not be null: invalid implementation of a search query InternalSearchUI.getInstance().removeQuery(query); } } super.okPressed(); } protected final void validateDialogState() { IStructuredSelection sel = (IStructuredSelection) fViewer.getSelection(); int elementsSelected = sel.toList().size(); fRemoveButton.setEnabled(elementsSelected > 0); Button okButton = getOkButton(); if (okButton != null) { okButton.setEnabled(elementsSelected == 1); } Button openInNewButton = getButton(IDialogConstants.OPEN_ID); if (openInNewButton != null) { openInNewButton.setEnabled(elementsSelected == 1); } } }