Java tutorial
/******************************************************************************* * Copyright (c) 2017 MEDEVIT <office@medevit.at>. * 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: * MEDEVIT <office@medevit.at> - initial API and implementation ******************************************************************************/ package ch.elexis.core.ui.views.controls; import java.util.HashMap; import java.util.LinkedList; import java.util.List; import java.util.Map; import org.eclipse.core.runtime.ListenerList; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.ISelectionProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; 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 ch.elexis.data.PersistentObject; /** * A {@link Composite} to manage the selection from a list of objects. A {@link Label} shows the * current selction and a {@link Button} is used to open a {@link Dialog} to change the selection. * * @author thomas * */ public class GenericSelectionComposite extends Composite implements ISelectionProvider { private ListenerList selectionListeners = new ListenerList(); private List<?> input; private IStructuredSelection selection; private Label selectLabel; private Button selectButton; public GenericSelectionComposite(Composite parent, int style) { super(parent, style); createContent(); } private void createContent() { setLayout(new GridLayout(2, false)); selectLabel = new Label(this, SWT.NONE); selectLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); selectButton = new Button(this, SWT.NONE); selectButton.setText("..."); //$NON-NLS-1$ selectButton.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false)); selectButton.addSelectionListener(new SelectionAdapter() { @SuppressWarnings("unchecked") @Override public void widgetSelected(SelectionEvent e) { if (input != null && !input.isEmpty()) { GenericSelectionDialog dialog = new GenericSelectionDialog(getShell(), input); if (selection != null) { dialog.setSelection(selection.toList()); } if (dialog.open() == Dialog.OK) { setSelection(dialog.getSelection()); callSelectionListeners(); } } } }); } private void updateLabel() { StringBuilder sb = new StringBuilder(); if (selection != null && !selection.isEmpty()) { for (Object object : selection.toList()) { String label = GenericSelectionDialog.getLabel(object); if (label != null && !label.isEmpty()) { if (sb.length() > 0) { sb.append(", ").append(label); } else { sb.append(label); } } } selectLabel.setText(sb.toString()); } else { selectLabel.setText(""); } getParent().layout(); } public void setInput(List<?> input) { this.input = input; } private void callSelectionListeners() { Object[] listeners = selectionListeners.getListeners(); if (listeners != null && listeners.length > 0) { for (Object object : listeners) { ((ISelectionChangedListener) object).selectionChanged(new SelectionChangedEvent(this, selection)); } } } @Override public void addSelectionChangedListener(ISelectionChangedListener listener) { selectionListeners.add(listener); } @Override public void removeSelectionChangedListener(ISelectionChangedListener listener) { selectionListeners.remove(listener); } @Override public ISelection getSelection() { if (selection != null) { return selection; } return StructuredSelection.EMPTY; } @Override public void setSelection(ISelection selection) { if (selection instanceof IStructuredSelection) { this.selection = (IStructuredSelection) selection; updateLabel(); } } /** * Dialog for managing the selection from a list of objects. For each Object a checkbox with * text is displayed. For {@link PersistentObject} instances the Label property is displayed, * else toString. * * @author thomas * */ public static class GenericSelectionDialog extends Dialog { private List<?> input; private Map<Object, Button> buttonMap = new HashMap<>(); private List<Object> selection = new LinkedList<>(); public GenericSelectionDialog(Shell parentShell, List<?> input) { super(parentShell); this.input = input; } public void setSelection(List<Object> selection) { this.selection = new LinkedList<>(selection); } public IStructuredSelection getSelection() { return new StructuredSelection(selection); } @Override protected Control createDialogArea(Composite parent) { Composite ret = (Composite) super.createDialogArea(parent); Label title = new Label(ret, SWT.NONE); title.setText("Auswahl:"); // create the UI for (Object object : input) { Button button = new Button(ret, SWT.CHECK); button.setText(getLabel(object)); button.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { if (button.getSelection()) { selection.add(object); } else { selection.remove(object); } } }); buttonMap.put(object, button); } updateSelectionUi(); return ret; } private void updateSelectionUi() { if (selection != null && !selection.isEmpty() && !buttonMap.isEmpty()) { for (Object object : selection) { buttonMap.get(object).setSelection(true); } } } protected static String getLabel(Object object) { if (object instanceof PersistentObject) { return ((PersistentObject) object).getLabel(); } else if (object != null) { return object.toString(); } else { return ""; } } } }