Java tutorial
/******************************************************************************* * Copyright 2013 Geoscience Australia * * 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 au.gov.ga.earthsci.discovery.darwin; import java.util.Collection; import java.util.List; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.StatusDialog; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ColumnViewerToolTipSupport; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; 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.custom.CLabel; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; 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.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.TableColumn; /** * Dialog used to select a URL to open from a Darwin discovery result. * * @author Michael de Hoog (michael.dehoog@ga.gov.au) */ public class DarwinURLSelectionDialog extends StatusDialog { private final List<DarwinDiscoveryResultURL> urls; private DarwinDiscoveryResultURL selected; private Button okButton; private TableViewer viewer; private CLabel urlLabel; public DarwinURLSelectionDialog(Shell parent, List<DarwinDiscoveryResultURL> urls) { super(parent); this.urls = urls; } public DarwinDiscoveryResultURL getSelected() { return selected; } public void setSelected(DarwinDiscoveryResultURL selected) { this.selected = selected; } @Override protected void createButtonsForButtonBar(Composite parent) { okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); validate(); } @Override protected void setShellStyle(int newShellStyle) { super.setShellStyle(newShellStyle | SWT.RESIZE); } @Override protected Control createDialogArea(Composite parent) { Composite comp = new Composite(parent, SWT.NONE); comp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); GridLayout layout = new GridLayout(); layout.marginTop = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING); comp.setLayout(layout); initializeDialogUnits(comp); viewer = new TableViewer(comp, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.FULL_SELECTION); GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true); //set max size (actual size is calculated below): gd.widthHint = 600; gd.heightHint = 400; viewer.getTable().setLayoutData(gd); viewer.setContentProvider(new ArrayContentProvider()); viewer.setLabelProvider(new LabelProvider()); viewer.setInput(urls); DarwinDiscoveryResultURL longestUrl = urlWithLongestName(urls); if (longestUrl != null) { GC gc = new GC(viewer.getTable()); Point point = gc.textExtent(longestUrl.getName()); gc.dispose(); gd.widthHint = Math.min(gd.widthHint, point.x); } int height = viewer.getTable().getItemHeight() * urls.size() + viewer.getTable().getHeaderHeight(); if (height < gd.heightHint) { //if height of all rows is less than the max height, then use the default height: gd.heightHint = SWT.DEFAULT; } //keep the column width in sync with the table width final TableColumn resultsColumn = new TableColumn(viewer.getTable(), SWT.LEFT); Listener resizeListener = new Listener() { @Override public void handleEvent(Event event) { resultsColumn.setWidth(viewer.getTable().getClientArea().width); } }; viewer.getControl().addListener(SWT.Resize, resizeListener); viewer.getControl().addListener(SWT.Paint, resizeListener); if (selected != null) { viewer.setSelection(new StructuredSelection(selected)); } else if (urls.size() == 1) { viewer.getTable().select(0); } else { //if there is a WMS url, select it by default for (DarwinDiscoveryResultURL url : urls) { if (url.getProtocol().toLowerCase().contains("wms")) //$NON-NLS-1$ { viewer.setSelection(new StructuredSelection(url)); break; } } } viewer.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { validate(); } }); ColumnViewerToolTipSupport.enableFor(viewer); urlLabel = new CLabel(comp, SWT.NONE); urlLabel.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false)); Dialog.applyDialogFont(comp); return comp; } private void validate() { selected = (DarwinDiscoveryResultURL) ((IStructuredSelection) viewer.getSelection()).getFirstElement(); urlLabel.setText(selected == null ? "" : selected.getUrl().toString().replace("&", "&&")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ boolean valid = selected != null; okButton.setEnabled(valid); } private static DarwinDiscoveryResultURL urlWithLongestName(Collection<DarwinDiscoveryResultURL> urls) { DarwinDiscoveryResultURL longest = null; int maxLength = 0; for (DarwinDiscoveryResultURL url : urls) { int length = url.getName().length(); if (length > maxLength) { maxLength = length; longest = url; } } return longest; } private static class LabelProvider extends ColumnLabelProvider { @Override public String getText(Object element) { return ((DarwinDiscoveryResultURL) element).getName(); } @Override public Image getImage(Object element) { return super.getImage(element); } @Override public String getToolTipText(Object element) { return ((DarwinDiscoveryResultURL) element).getUrl().toString(); } } }