Java tutorial
// ============================================================================ // // Copyright (C) 2006-2015 Talend Inc. - www.talend.com // // This source code is available under agreement available at // %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt // // You should have received a copy of the agreement // along with this program; if not, write to Talend SA // 9 rue Pages 92150 Suresnes, France // // ============================================================================ package org.talend.repository.ui.wizards.ConfigExternalLib; import java.util.ArrayList; import java.util.Collections; import java.util.List; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; 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.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.Widget; /** * DOC tguiu class global comment. Detailled comment <br/> * * $Id: TableEditor.java 1819 2007-02-05 09:09:15 +0000 (, 05 2007) yzhang $ * */ public abstract class TableField { private TableViewer viewer; private List<Object> list; /** * The button box containing the Add, Remove, Up, and Down buttons; <code>null</code> if none (before creation or * after disposal). */ private Composite buttonBox; /** * The Add button. */ private Button addButton; /** * The Remove button. */ private Button removeButton; /** * The Up button. */ private Button upButton; /** * The Down button. */ private Button downButton; // use this to store the original input private List<Object> backupList = new ArrayList<Object>(); /** * The selection listener. */ private SelectionListener selectionListener; private boolean isReadOnly; public TableField(String name, Composite parent) { this(name, parent, false); } public TableField(String name, Composite parent, boolean isReadOnly) { this.isReadOnly = isReadOnly; createControl(name, parent); } @SuppressWarnings("unchecked") public void setInput(List list) { this.list = list; backupList.addAll(list); viewer.setInput(list); } /** * Creates this field editor's main control containing all of its basic controls. * * @param name * * @param parent the parent control */ protected void createControl(String name, Composite parent) { GridLayout layout = new GridLayout(); layout.numColumns = 3; layout.marginWidth = 0; layout.marginHeight = 0; parent.setLayout(layout); doFillIntoGrid(name, parent); } /** * Notifies that the Add button has been pressed. */ private void addPressed() { List input = getNewInputObject(); if (input != null) { int index = viewer.getTable().getSelectionIndex(); if (index >= 0) { list.addAll(index + 1, input); } else { list.addAll(input); } viewer.refresh(); selectionChanged(); } } /** * Creates the Add, Remove, Up, and Down button in the given button box. * * @param box the box for the buttons */ private void createButtons(Composite box) { addButton = createPushButton(box, "ListEditor.add"); //$NON-NLS-1$ removeButton = createPushButton(box, "ListEditor.remove"); //$NON-NLS-1$ addButton.setEnabled(!isReadOnly); removeButton.setEnabled(!isReadOnly); // upButton = createPushButton(box, "ListEditor.up"); //$NON-NLS-1$ // downButton = createPushButton(box, "ListEditor.down"); //$NON-NLS-1$ } /** * Helper method to create a push button. * * @param parent the parent control * @param key the resource name used to supply the button's label text * @return Button */ private Button createPushButton(Composite parent, String key) { Button button = new Button(parent, SWT.PUSH); button.setText(JFaceResources.getString(key)); button.setFont(parent.getFont()); GridData data = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING); int widthHint = IDialogConstants.BUTTON_WIDTH; data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); button.setLayoutData(data); button.addSelectionListener(getSelectionListener()); return button; } /** * Creates a selection listener. */ public void createSelectionListener() { selectionListener = new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent event) { Widget widget = event.widget; if (widget == addButton) { addPressed(); } else if (widget == removeButton) { removePressed(); } else if (widget == upButton) { upPressed(); } else if (widget == downButton) { downPressed(); // } else if (widget == viewer.getTable()) { // selectionChanged(); } } }; } /* * (non-Javadoc) Method declared on FieldEditor. */ protected void doFillIntoGrid(String name, Composite parent) { Label label = new Label(parent, SWT.NONE); label.setText(name); GridDataFactory.swtDefaults().align(SWT.BEGINNING, SWT.BEGINNING).applyTo(label); viewer = getTableControl(parent); GridData gd = new GridData(GridData.FILL_BOTH); gd.heightHint = 150; viewer.getTable().setLayoutData(gd); buttonBox = getButtonBoxControl(parent); gd = new GridData(GridData.VERTICAL_ALIGN_BEGINNING); buttonBox.setLayoutData(gd); } /** * Notifies that the Down button has been pressed. */ private void downPressed() { swap(false); } /** * Returns this field editor's button box containing the Add, Remove, Up, and Down button. * * @param parent the parent control * @return the button box */ public Composite getButtonBoxControl(Composite parent) { buttonBox = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.marginWidth = 5; layout.marginTop = 0; buttonBox.setLayout(layout); createButtons(buttonBox); buttonBox.addDisposeListener(new DisposeListener() { @Override public void widgetDisposed(DisposeEvent event) { addButton = null; removeButton = null; upButton = null; downButton = null; buttonBox = null; } }); selectionChanged(); return buttonBox; } /** * Returns this field editor's list control. * * @param parent the parent control * @return the list control */ protected TableViewer getTableControl(Composite parent) { list = new ArrayList<Object>(); Table table = createTable(parent); viewer = new TableViewer(table); viewer.setContentProvider(createContentProvider()); viewer.setLabelProvider(createLabelProvider()); table.setFont(parent.getFont()); viewer.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { TableField.this.selectionChanged(); } }); // viewer.addDoubleClickListener(new IDoubleClickListener() { // // public void doubleClick(DoubleClickEvent event) { // IStructuredSelection selection = ((IStructuredSelection) event.getSelection()); // String existing = (String) selection.getFirstElement(); // String value = getExistingInputObject(existing); // if (value != null) { // int indexOf = list.indexOf(existing); // list.remove(existing); // list.add(indexOf, value); // viewer.refresh(); // } // // } // }); return viewer; } protected abstract IStructuredContentProvider createContentProvider(); protected abstract ITableLabelProvider createLabelProvider(); protected abstract Table createTable(Composite parent); /** * Creates and returns a new item for the list. * <p> * Subclasses must implement this method. * </p> * * @return a new item */ protected abstract List getNewInputObject(); /** * Returns this field editor's selection listener. The listener is created if nessessary. * * @return the selection listener */ private SelectionListener getSelectionListener() { if (selectionListener == null) { createSelectionListener(); } return selectionListener; } /** * Returns this field editor's shell. * <p> * This method is internal to the framework; subclassers should not call this method. * </p> * * @return the shell */ protected Shell getShell() { if (addButton == null) { return null; } return addButton.getShell(); } /** * Notifies that the Remove button has been pressed. */ private void removePressed() { IStructuredSelection selection = (IStructuredSelection) viewer.getSelection(); if (selection.isEmpty()) { return; } for (Object obj : selection.toArray()) { list.remove(obj); } viewer.refresh(); selectionChanged(); afterDeleteSelection(selection.toList()); } /** * subclass can implements this to do it's own job. * * @param list2 */ protected void afterDeleteSelection(List list) { } /** * Notifies that the list selection has changed. */ private void selectionChanged() { int index = viewer.getTable().getSelectionIndex(); int size = viewer.getTable().getItemCount(); removeButton.setEnabled(index >= 0 && !isReadOnly); // upButton.setEnabled(size > 1 && index > 0); // downButton.setEnabled(size > 1 && index >= 0 && index < size - 1); } /* * (non-Javadoc) Method declared on FieldEditor. */ public void setFocus() { if (viewer != null) { viewer.getTable().setFocus(); } } /** * Moves the currently selected item up or down. * * @param up <code>true</code> if the item should move up, and <code>false</code> if it should move down */ private void swap(boolean up) { int index = viewer.getTable().getSelectionIndex(); int target = up ? index - 1 : index + 1; if (index >= 0) { Collections.swap(list, index, target); // viewer.setSelection(target); } viewer.refresh(); selectionChanged(); } /** * Notifies that the Up button has been pressed. */ private void upPressed() { swap(true); } /* * @see FieldEditor.setEnabled(boolean,Composite). */ public void setEnabled(boolean enabled, Composite parent) { getTableControl(parent).getTable().setEnabled(enabled); addButton.setEnabled(enabled); removeButton.setEnabled(enabled); // upButton.setEnabled(enabled); // downButton.setEnabled(enabled); } /** * Getter for list. * * @return the list */ public List getList() { return this.list; } public void revert() { list.clear(); list.addAll(backupList); } }