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.common.ui.dialogs; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.TitleAreaDialog; import org.eclipse.jface.layout.TableColumnLayout; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ColumnPixelData; import org.eclipse.jface.viewers.ColumnWeightData; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TableViewerColumn; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.graphics.Point; 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.gdal.osr.SpatialReference; import au.gov.ga.earthsci.common.spatial.SpatialReferences; import au.gov.ga.earthsci.common.spatial.SpatialReferences.SpatialReferenceSummary; import au.gov.ga.earthsci.common.util.Util; /** * A dialog that allows a user to select a spatial reference system (SRS) from a * list of known reference systems. * * @author James Navin (james.navin@ga.gov.au) * */ public final class SpatialReferenceSelectorDialog extends TitleAreaDialog { private static final Point DIALOG_SIZE = new Point(400, 500); private SpatialReferenceSummary selectedSummary = null; private Text filterText; private TableViewer referencesView; public SpatialReferenceSelectorDialog(Shell parentShell) { super(parentShell); } @Override protected void configureShell(Shell newShell) { super.configureShell(newShell); newShell.setText(Messages.getString("SpatialReferenceSelectorDialog.DialogTitle")); //$NON-NLS-1$ newShell.setSize(DIALOG_SIZE); newShell.setMinimumSize(DIALOG_SIZE); } @Override protected Control createDialogArea(Composite parent) { setTitle(Messages.getString("SpatialReferenceSelectorDialog.DialogTitle")); //$NON-NLS-1$ setMessage(Messages.getString("SpatialReferenceSelectorDialog.DialogDescription")); //$NON-NLS-1$ Composite container = (Composite) super.createDialogArea(parent); addFilterText(container); addReferencesTableViewer(container); wireReferenceSelectionListener(); wireFilterTextToViewer(); return container; } @Override protected void createButtonsForButtonBar(Composite parent) { super.createButtonsForButtonBar(parent); getButton(IDialogConstants.OK_ID).setEnabled(false); } private void wireReferenceSelectionListener() { referencesView.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { IStructuredSelection selection = (IStructuredSelection) event.getSelection(); if (selection.isEmpty()) { getButton(IDialogConstants.OK_ID).setEnabled(false); selectedSummary = null; } else { getButton(IDialogConstants.OK_ID).setEnabled(true); selectedSummary = (SpatialReferenceSummary) selection.getFirstElement(); } } }); } private void wireFilterTextToViewer() { referencesView.addFilter(new ViewerFilter() { @Override public boolean select(Viewer viewer, Object parentElement, Object element) { // TODO: This filter is quite naive. Might be nicer to some wildcard matching etc. String search = Util.removeWhitespace(filterText.getText()).toUpperCase(); if (Util.isEmpty(search)) { return true; } SpatialReferenceSummary summary = (SpatialReferenceSummary) element; String candidate = Util.removeWhitespace(summary.getEpsg() + summary.getName()).toUpperCase(); return candidate.contains(search); } }); filterText.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { referencesView.refresh(); } }); } private void addFilterText(Composite container) { filterText = new Text(container, SWT.SINGLE | SWT.BORDER | SWT.SEARCH | SWT.ICON_SEARCH | SWT.ICON_ERROR); filterText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL)); } private void addReferencesTableViewer(Composite container) { Composite tableContainer = new Composite(container, SWT.NONE); tableContainer.setLayoutData(new GridData(GridData.FILL_BOTH)); TableColumnLayout tableColumnLayout = new TableColumnLayout(); tableContainer.setLayout(tableColumnLayout); referencesView = new TableViewer(tableContainer, SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER | SWT.SINGLE | SWT.VIRTUAL | SWT.FULL_SELECTION); referencesView.setContentProvider(ArrayContentProvider.getInstance()); referencesView.setInput(SpatialReferences.get()); referencesView.getTable().setLinesVisible(true); referencesView.getTable().setHeaderVisible(true); TableViewerColumn epsgColumn = new TableViewerColumn(referencesView, SWT.NONE); epsgColumn.getColumn().setText(Messages.getString("SpatialReferenceSelectorDialog.CodeColumnTitle")); //$NON-NLS-1$ tableColumnLayout.setColumnData(epsgColumn.getColumn(), new ColumnPixelData(80)); epsgColumn.setLabelProvider(new ColumnLabelProvider() { @Override public String getText(Object element) { return ((SpatialReferenceSummary) element).getEpsg(); } }); TableViewerColumn nameColumn = new TableViewerColumn(referencesView, SWT.NONE); nameColumn.getColumn().setText(Messages.getString("SpatialReferenceSelectorDialog.NameColumnTitle")); //$NON-NLS-1$ tableColumnLayout.setColumnData(nameColumn.getColumn(), new ColumnWeightData(100)); nameColumn.setLabelProvider(new ColumnLabelProvider() { @Override public String getText(Object element) { return ((SpatialReferenceSummary) element).getName(); } }); } @Override protected void cancelPressed() { selectedSummary = null; super.cancelPressed(); } /** * Get the user-selected {@link SpatialReference}, or <code>null</code> if * none was selected or the dialog was cancelled. */ public SpatialReference getSelectedSpatialReference() { return selectedSummary == null ? null : selectedSummary.createReference(); } public SpatialReferenceSummary getSelected() { return selectedSummary; } }