Java tutorial
/* * * JMoney - A Personal Finance Manager * Copyright (c) 2010 Nigel Westbury <westbury@users.sourceforge.net> * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ package net.sf.jmoney.views.feedback; import java.text.MessageFormat; import java.util.ArrayList; import java.util.List; import net.sf.jmoney.JMoneyPlugin; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.FontMetrics; import org.eclipse.swt.graphics.GC; 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.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.ui.dialogs.SelectionDialog; /** * Dialog that shows a list of items with icon and label. */ public class FeedbackHistorySelectionDialog extends SelectionDialog { private static final int REMOVE_ID = IDialogConstants.CLIENT_ID + 1; private static final int WIDTH_IN_CHARACTERS = 55; private final int historyLimit = 10; private List<Feedback> fInput; private final List<Feedback> fRemovedEntries; private TableViewer fViewer; private Button fRemoveButton; private boolean fIsOpenInNewView; private FeedbackView fFeedbackView; private static final class FeedbackLabelProvider extends LabelProvider { private ArrayList<Image> fImages = new ArrayList<Image>(); @Override public String getText(Object element) { return ((Feedback) element).getLabel(); } @Override public Image getImage(Object element) { ImageDescriptor imageDescriptor = ((Feedback) element).getImageDescriptor(); if (imageDescriptor == null) return null; Image image = imageDescriptor.createImage(); fImages.add(image); return image; } @Override public void dispose() { for (Image image : fImages) { image.dispose(); } fImages = null; } } public FeedbackHistorySelectionDialog(Shell parent, List<Feedback> input, FeedbackView feedbackView) { super(parent); setTitle("Feedback on Previous Actions"); setMessage("&Select the action for which you would like to see the feedback:"); fInput = input; fFeedbackView = feedbackView; fRemovedEntries = new ArrayList<Feedback>(); setHelpAvailable(false); } /** * @return the isOpenInNewView */ public boolean isOpenInNewView() { return fIsOpenInNewView; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#getDialogBoundsSettings() */ @Override protected IDialogSettings getDialogBoundsSettings() { IDialogSettings dialogSettings = JMoneyPlugin.getDefault().getDialogSettings(); IDialogSettings section = dialogSettings.getSection("DialogBounds_FeedbackHistorySelectionDialog"); if (section == null) { section = dialogSettings.addNewSection("DialogBounds_FeedbackHistorySelectionDialog"); } return section; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#getDialogBoundsStrategy() */ @Override protected int getDialogBoundsStrategy() { return DIALOG_PERSISTSIZE; } /* * Overrides method from Dialog */ @Override protected Label createMessageArea(Composite composite) { Composite parent = new Composite(composite, SWT.NONE); GridLayout layout = new GridLayout(); layout.numColumns = 2; layout.marginHeight = 0; layout.marginWidth = 0; parent.setLayout(layout); parent.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Label label = new Label(parent, SWT.WRAP); label.setText(getMessage()); GridData gd = new GridData(GridData.FILL_HORIZONTAL); //gd.widthHint= convertWidthInCharsToPixels(WIDTH_IN_CHARACTERS); label.setLayoutData(gd); applyDialogFont(label); return label; } /* (non-Javadoc) * @see org.eclipse.jface.window.Window#create() */ @Override public void create() { super.create(); List<?> initialSelection = getInitialElementSelections(); if (initialSelection != null) fViewer.setSelection(new StructuredSelection(initialSelection)); validateDialogState(); } /* * Overrides method from Dialog */ @Override protected Control createDialogArea(Composite container) { Composite ancestor = (Composite) super.createDialogArea(container); createMessageArea(ancestor); Composite parent = new Composite(ancestor, SWT.NONE); GridLayout layout = new GridLayout(); layout.numColumns = 2; layout.marginHeight = 0; layout.marginWidth = 0; parent.setLayout(layout); parent.setLayoutData(new GridData(GridData.FILL_BOTH)); fViewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER | SWT.FULL_SELECTION); fViewer.setContentProvider(new ArrayContentProvider()); final Table table = fViewer.getTable(); table.addMouseListener(new MouseAdapter() { @Override public void mouseDoubleClick(MouseEvent e) { okPressed(); } }); fViewer.setLabelProvider(new FeedbackLabelProvider()); GridData gd = new GridData(GridData.FILL_BOTH); gd.heightHint = convertHeightInCharsToPixels(15); gd.widthHint = convertWidthInCharsToPixels(WIDTH_IN_CHARACTERS); table.setLayoutData(gd); fRemoveButton = new Button(parent, SWT.PUSH); fRemoveButton.setText("&Remove"); fRemoveButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent event) { buttonPressed(REMOVE_ID); } }); GridData removeButtonLayoutData = new GridData(GridData.BEGINNING, GridData.BEGINNING, false, false); fRemoveButton.setFont(JFaceResources.getDialogFont()); GC gc = new GC(fRemoveButton); gc.setFont(fRemoveButton.getFont()); FontMetrics fFontMetrics = gc.getFontMetrics(); gc.dispose(); int widthHint = Dialog.convertHorizontalDLUsToPixels(fFontMetrics, IDialogConstants.BUTTON_WIDTH); removeButtonLayoutData.widthHint = Math.max(widthHint, fRemoveButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); removeButtonLayoutData.horizontalAlignment = GridData.FILL; fRemoveButton.setLayoutData(removeButtonLayoutData); fViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { validateDialogState(); } }); Label fLink = new Label(parent, SWT.NONE); fLink.setText(MessageFormat.format("History limited to {0} result sets not shown in views.", new Integer(historyLimit))); fLink.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1)); applyDialogFont(ancestor); // set input & selections last, so all the widgets are created. fViewer.setInput(fInput); fViewer.getTable().setFocus(); return ancestor; } protected final void validateDialogState() { IStructuredSelection sel = (IStructuredSelection) fViewer.getSelection(); int elementsSelected = sel.toList().size(); fRemoveButton.setEnabled(elementsSelected > 0); Button okButton = getOkButton(); if (okButton != null) { okButton.setEnabled(elementsSelected == 1); } Button openInNewButton = getButton(IDialogConstants.OPEN_ID); if (openInNewButton != null) { openInNewButton.setEnabled(elementsSelected == 1); } } /* (non-Javadoc) * @see org.eclipse.ui.dialogs.SelectionDialog#createButtonsForButtonBar(org.eclipse.swt.widgets.Composite) */ @Override protected void createButtonsForButtonBar(Composite parent) { createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OPEN_LABEL, true); createButton(parent, IDialogConstants.OPEN_ID, "Open in &New", false); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); } @Override protected void buttonPressed(int buttonId) { if (buttonId == REMOVE_ID) { IStructuredSelection selection = (IStructuredSelection) fViewer.getSelection(); for (Object curr : selection.toList()) { fRemovedEntries.add((Feedback) curr); fInput.remove(curr); fViewer.remove(curr); } if (fViewer.getSelection().isEmpty() && !fInput.isEmpty()) { fViewer.setSelection(new StructuredSelection(fInput.get(0))); } return; } if (buttonId == IDialogConstants.OPEN_ID) { fIsOpenInNewView = true; super.buttonPressed(IDialogConstants.OK_ID); } else { super.buttonPressed(buttonId); } } /* * Overrides method from Dialog */ @Override protected void okPressed() { // Build a list of selected children. ISelection selection = fViewer.getSelection(); if (selection instanceof IStructuredSelection) setResult(((IStructuredSelection) fViewer.getSelection()).toList()); // remove queries fFeedbackView.removeFeedback(fRemovedEntries); super.okPressed(); } }