Java tutorial
/******************************************************************************* * Copyright (c) 2006-2010 eBay Inc. All Rights Reserved. * 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 *******************************************************************************/ package org.ebayopensource.turmeric.eclipse.ui.components; import java.util.Arrays; import java.util.List; 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.swt.SWT; 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.Label; import org.eclipse.swt.widgets.TableColumn; /** * Custom widget - Table Viewer with button panel. * * @author ramurthy */ public class TableButtonPanelViewer extends TableViewer { private ColumnDef[] columns; private Button addButton; private Button removeButton; private Button upButton; private Button downButton; /** * Instantiates a new table button panel viewer. * * @param parent the parent * @param style the style * @param columnDef the column def */ public TableButtonPanelViewer(Composite parent, int style, ColumnDef[] columnDef) { super(parent, style | SWT.SINGLE); this.columns = columnDef; getTable().setHeaderVisible(true); getTable().setLinesVisible(true); setColumns(); } /** * Instantiates a new table button panel viewer. * * @param parent the parent * @param style the style * @param columnDef the column def * @param createAddRemoveButtons the create add remove buttons */ public TableButtonPanelViewer(Composite parent, int style, ColumnDef[] columnDef, boolean createAddRemoveButtons) { this(parent, style, columnDef, createAddRemoveButtons, createAddRemoveButtons); } /** * Instantiates a new table button panel viewer. * * @param parent the parent * @param style the style * @param columnDef the column def * @param createAddRemoveButtons the create add remove buttons * @param createUpDownButtons the create up down buttons */ public TableButtonPanelViewer(Composite parent, int style, ColumnDef[] columnDef, boolean createAddRemoveButtons, boolean createUpDownButtons) { this(parent, style, columnDef); if (createAddRemoveButtons) createButtons(parent, createUpDownButtons); } private void setColumns() { if (columns != null) { for (int i = 0; i < columns.length; i++) { TableColumn tableColumn = new TableColumn(getTable(), SWT.NONE); tableColumn.setText(columns[i].getTitle()); tableColumn.setWidth(columns[i].getWidth()); tableColumn.setData(columns[i]); tableColumn.setImage(columns[i].getImage()); } } addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { viewerSelectionChanged(event); resetButtons(); } }); } /** * Viewer selection changed. * * @param event the event */ protected void viewerSelectionChanged(SelectionChangedEvent event) { } /** * Gets the adds the button. * * @return the adds the button */ public Button getAddButton() { return addButton; } /** * Gets the removes the button. * * @return the removes the button */ public Button getRemoveButton() { return removeButton; } /** * Gets the up button. * * @return the up button */ public Button getUpButton() { return upButton; } /** * Gets the down button. * * @return the down button */ public Button getDownButton() { return downButton; } private void createButtons(Composite parent, boolean createUpDownButtons) { Composite buttonComposite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(1, false); buttonComposite.setLayout(layout); GridData gd = new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false); buttonComposite.setLayoutData(gd); gd = new GridData(); gd.widthHint = 80; addButton = new Button(buttonComposite, SWT.PUSH | SWT.CENTER); addButton.setText("&Add"); addButton.setLayoutData(gd); addButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { addButtonSelected(e); resetButtons(); } }); removeButton = new Button(buttonComposite, SWT.PUSH | SWT.CENTER); removeButton.setText("&Remove"); removeButton.setLayoutData(gd); removeButton.setEnabled(false); removeButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { removeButtonSelected(e); resetButtons(); } }); if (createUpDownButtons) { //we also need the Up/Down buttons new Label(buttonComposite, SWT.LEFT); upButton = new Button(buttonComposite, SWT.PUSH | SWT.CENTER); upButton.setText("&Up"); upButton.setLayoutData(gd); upButton.setEnabled(false); upButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { upButtonSelected(e); resetButtons(); } }); downButton = new Button(buttonComposite, SWT.PUSH | SWT.CENTER); downButton.setText("&Down"); downButton.setLayoutData(gd); downButton.setEnabled(false); downButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { downButtonSelected(e); resetButtons(); } }); } } /** * Adds the button selected. * * @param event the event */ protected void addButtonSelected(SelectionEvent event) { } /** * Removes the button selected. * * @param event the event */ protected void removeButtonSelected(SelectionEvent event) { } /** * Up button selected. * * @param event the event */ protected void upButtonSelected(SelectionEvent event) { } /** * Down button selected. * * @param event the event */ protected void downButtonSelected(SelectionEvent event) { } private void resetButtons() { if (upButton != null && downButton != null) { upButton.setEnabled(false); downButton.setEnabled(false); } final Object obj = getSelectedObject(); removeButton.setEnabled(obj != null); if (obj != null) { removeButton.setEnabled(true); if (upButton != null && downButton != null) { final int index = getTable().getSelectionIndex(); final int size = getTable().getItemCount(); if (index > 0) upButton.setEnabled(true); if (index + 1 < size) downButton.setEnabled(true); } } } /** * Sets the adds the buttons enabled. * * @param enabled the new adds the buttons enabled */ public void setAddButtonsEnabled(boolean enabled) { addButton.setEnabled(enabled); } /** * Gets the selected object. * * @return the selected object */ public Object getSelectedObject() { if (getSelection().isEmpty() == false && getSelection() instanceof IStructuredSelection) { return ((IStructuredSelection) getSelection()).getFirstElement(); } return null; } /** * Gets the column names. * * @return the column names */ public List<String> getColumnNames() { String[] columnNames = new String[columns.length]; for (int i = 0; i < columns.length; i++) { columnNames[i] = columns[i].getTitle(); } return Arrays.asList(columnNames); } /** * Column Definition. * * @author ramurthy */ public static class ColumnDef { private String title; private int width; private Image image; /** * Instantiates a new column def. * * @param title the title * @param width the width */ public ColumnDef(String title, int width) { this.title = title; this.width = width; } /** * Instantiates a new column def. * * @param title the title * @param width the width * @param image the image */ public ColumnDef(String title, int width, Image image) { this(title, width); this.image = image; } /** * Gets the title. * * @return the title */ public String getTitle() { return title; } /** * Gets the width. * * @return the width */ public int getWidth() { return width; } /** * Gets the image. * * @return the image */ public Image getImage() { return image; } } }