Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2006 IBM Corporation and others. * 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: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.dltk.internal.testing.util; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.BusyIndicator; 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.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.viewers.CheckStateChangedEvent; import org.eclipse.jface.viewers.CheckboxTableViewer; import org.eclipse.jface.viewers.ICheckStateListener; import org.eclipse.jface.viewers.ILabelProvider; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.ui.dialogs.ISelectionStatusValidator; import org.eclipse.ui.dialogs.SelectionStatusDialog; import org.eclipse.dltk.internal.testing.wizards.WizardMessages; import org.eclipse.dltk.testing.DLTKTestingPlugin; /** * A dialog with checked table viewer. */ public class CheckedTableSelectionDialog extends SelectionStatusDialog { private CheckboxTableViewer fViewer; private ILabelProvider fLabelProvider; private IStructuredContentProvider fContentProvider; private ISelectionStatusValidator fValidator = null; private String fEmptyListMessage = WizardMessages.CheckedTableSelectionDialog_emptyListMessage; private IStatus fCurrStatus = Status.OK_STATUS; private List fFilters; private Object fInput; private boolean fIsEmpty; private int fWidth = 40; private int fHeight = 18; /** * Constructs an instance of <code>ElementTreeSelectionDialog</code>. * @param labelProvider the label provider to render the entries * @param contentProvider the content provider to evaluate the tree structure */ public CheckedTableSelectionDialog(Shell parent, ILabelProvider labelProvider, IStructuredContentProvider contentProvider) { super(parent); fLabelProvider = labelProvider; fContentProvider = contentProvider; setResult(new ArrayList(0)); setStatusLineAboveButtons(true); } /** * Sets the initial selection. * Convenience method. * @param selection the initial selection. */ public void setInitialSelection(Object selection) { setInitialSelections(new Object[] { selection }); } /** * Sets the message to be displayed if the list is empty. * @param message the message to be displayed. */ public void setEmptyListMessage(String message) { fEmptyListMessage = message; } /** * Adds a filter to the tree viewer. * @param filter a filter. */ public void addFilter(ViewerFilter filter) { if (fFilters == null) fFilters = new ArrayList(4); fFilters.add(filter); } /** * Sets an optional validator to check if the selection is valid. * The validator is invoked whenever the selection changes. * @param validator the validator to validate the selection. */ public void setValidator(ISelectionStatusValidator validator) { fValidator = validator; } /** * Sets the tree input. * @param input the tree input. */ public void setInput(Object input) { fInput = input; } /** * Sets the size of the tree in unit of characters. * @param width the width of the tree. * @param height the height of the tree. */ public void setSize(int width, int height) { fWidth = width; fHeight = height; } protected void updateOKStatus() { if (!fIsEmpty) { if (fValidator != null) { fCurrStatus = fValidator.validate(fViewer.getCheckedElements()); updateStatus(fCurrStatus); } else if (!fCurrStatus.isOK()) { fCurrStatus = Status.CANCEL_STATUS; } } else { fCurrStatus = new Status(IStatus.ERROR, DLTKTestingPlugin.PLUGIN_ID, fEmptyListMessage, null); } updateStatus(fCurrStatus); } /* * @see Window#open() */ public int open() { fIsEmpty = evaluateIfTableEmpty(fInput); BusyIndicator.showWhile(null, new Runnable() { public void run() { access$superOpen(); } }); return getReturnCode(); } private void access$superOpen() { super.open(); } /** * Handles cancel button pressed event. */ protected void cancelPressed() { setResult(null); super.cancelPressed(); } /* * @see SelectionStatusDialog#computeResult() */ protected void computeResult() { setResult(Arrays.asList(fViewer.getCheckedElements())); } /* * @see Window#create() */ public void create() { super.create(); List initialSelections = getInitialElementSelections(); if (initialSelections.size() > 0) { fViewer.setCheckedElements(initialSelections.toArray()); } updateOKStatus(); } /* * @see Dialog#createDialogArea(Composite) */ protected Control createDialogArea(Composite parent) { Composite composite = (Composite) super.createDialogArea(parent); Label messageLabel = createMessageArea(composite); Control treeWidget = createTableViewer(composite); Control buttonComposite = createSelectionButtons(composite); GridData data = new GridData(GridData.FILL_BOTH); data.widthHint = convertWidthInCharsToPixels(fWidth); data.heightHint = convertHeightInCharsToPixels(fHeight); treeWidget.setLayoutData(data); if (fIsEmpty) { messageLabel.setEnabled(false); treeWidget.setEnabled(false); buttonComposite.setEnabled(false); } applyDialogFont(composite); return composite; } private Table createTableViewer(Composite parent) { fViewer = CheckboxTableViewer.newCheckList(parent, SWT.BORDER); fViewer.setContentProvider(fContentProvider); fViewer.setLabelProvider(fLabelProvider); fViewer.addCheckStateListener(new ICheckStateListener() { public void checkStateChanged(CheckStateChangedEvent event) { updateOKStatus(); } }); if (fFilters != null) { for (int i = 0; i != fFilters.size(); i++) fViewer.addFilter((ViewerFilter) fFilters.get(i)); } fViewer.setInput(fInput); return fViewer.getTable(); } /** * Add the selection and deselection buttons to the dialog. * @param composite org.eclipse.swt.widgets.Composite */ private Composite createSelectionButtons(Composite composite) { Composite buttonComposite = new Composite(composite, SWT.RIGHT); GridLayout layout = new GridLayout(); layout.numColumns = 2; buttonComposite.setLayout(layout); GridData data = new GridData(GridData.HORIZONTAL_ALIGN_END | GridData.GRAB_HORIZONTAL); data.grabExcessHorizontalSpace = true; composite.setData(data); Button selectButton = createButton(buttonComposite, IDialogConstants.SELECT_ALL_ID, WizardMessages.CheckedTableSelectionDialog_selectAll, false); SelectionListener listener = new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { fViewer.setCheckedElements(fContentProvider.getElements(fInput)); updateOKStatus(); } }; selectButton.addSelectionListener(listener); Button deselectButton = createButton(buttonComposite, IDialogConstants.DESELECT_ALL_ID, WizardMessages.CheckedTableSelectionDialog_deselectAll, false); listener = new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { fViewer.setCheckedElements(new Object[0]); updateOKStatus(); } }; deselectButton.addSelectionListener(listener); return buttonComposite; } private boolean evaluateIfTableEmpty(Object input) { Object[] elements = fContentProvider.getElements(input); if (elements.length > 0) { if (fFilters != null) { for (int i = 0; i < fFilters.size(); i++) { ViewerFilter curr = (ViewerFilter) fFilters.get(i); elements = curr.filter(fViewer, input, elements); } } } return elements.length == 0; } }