Java tutorial
/******************************************************************************* * Copyright 2008, 2013 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.edt.ide.ui.internal.dialogs; import java.text.MessageFormat; import java.util.ArrayList; import java.util.List; import org.eclipse.core.runtime.IStatus; import org.eclipse.edt.ide.ui.internal.UINlsStrings; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.util.Assert; import org.eclipse.jface.viewers.ILabelProvider; import org.eclipse.swt.SWT; 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.ui.dialogs.AbstractElementListSelectionDialog; public class MultiElementListSelectionDialog extends AbstractElementListSelectionDialog { private static class Page { public Object[] elements; public String filter; public boolean okState = false; public Page(Object[] elements) { this.elements = elements; } } private Page[] fPages; private int fCurrentPage; private int fNumberOfPages; private Button fFinishButton; private Button fBackButton; private Button fNextButton; private Label fPageInfoLabel; private String fPageInfoMessage = UINlsStrings.MultiElementListSelectionDialog_pageInfoMessage; /** * Constructs a multi-page list selection dialog. * @param parent The parent shell * @param renderer the label renderer. */ public MultiElementListSelectionDialog(Shell parent, ILabelProvider renderer) { super(parent, renderer); } /** * Sets message shown in the right top corner. Use {0} and {1} as placeholders * for the current and the total number of pages. * @param message the message. */ public void setPageInfoMessage(String message) { fPageInfoMessage = message; } /** * Sets the elements to be displayed in the dialog. * @param elements an array of pages holding arrays of elements */ public void setElements(Object[][] elements) { fNumberOfPages = elements.length; fPages = new Page[fNumberOfPages]; for (int i = 0; i != fNumberOfPages; i++) fPages[i] = new Page(elements[i]); initializeResult(fNumberOfPages); } /* * @see Window#open() */ public int open() { List selection = getInitialElementSelections(); if (selection == null || selection.size() != fNumberOfPages) { setInitialSelections(new Object[fNumberOfPages]); selection = getInitialElementSelections(); } Assert.isTrue(selection.size() == fNumberOfPages); return super.open(); } /* * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(Composite) */ protected Control createDialogArea(Composite parent) { Composite contents = (Composite) super.createDialogArea(parent); createMessageArea(contents); createFilterText(contents); createFilteredList(contents); fCurrentPage = 0; setPageData(); applyDialogFont(contents); return contents; } /* * @see org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(Composite) */ protected void createButtonsForButtonBar(Composite parent) { fBackButton = createButton(parent, IDialogConstants.BACK_ID, IDialogConstants.BACK_LABEL, false); fNextButton = createButton(parent, IDialogConstants.NEXT_ID, IDialogConstants.NEXT_LABEL, true); fFinishButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.FINISH_LABEL, false); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); } /* * @see org.eclipse.ui.dialogs.SelectionDialog#createMessageArea(Composite) */ protected Label createMessageArea(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.marginHeight = 0; layout.marginWidth = 0; layout.horizontalSpacing = 5; layout.numColumns = 2; composite.setLayout(layout); GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL); composite.setLayoutData(data); Label messageLabel = super.createMessageArea(composite); fPageInfoLabel = new Label(composite, SWT.NULL); fPageInfoLabel.setText(getPageInfoMessage()); data = new GridData(GridData.HORIZONTAL_ALIGN_FILL); data.horizontalAlignment = GridData.END; fPageInfoLabel.setLayoutData(data); applyDialogFont(messageLabel); return messageLabel; } /* * @see org.eclipse.ui.dialogs.SelectionStatusDialog#computeResult() */ protected void computeResult() { setResult(fCurrentPage, getSelectedElements()); } /* * @see org.eclipse.jface.dialogs.Dialog#buttonPressed(int) */ protected void buttonPressed(int buttonId) { if (buttonId == IDialogConstants.BACK_ID) { turnPage(false); } else if (buttonId == IDialogConstants.NEXT_ID) { turnPage(true); } else { super.buttonPressed(buttonId); } } /** * @see AbstractElementListSelectionDialog#handleDefaultSelected() */ protected void handleDefaultSelected() { if (validateCurrentSelection()) { if (fCurrentPage == fNumberOfPages - 1) { buttonPressed(IDialogConstants.OK_ID); } else { buttonPressed(IDialogConstants.NEXT_ID); } } } /** * @see AbstractElementListSelectionDialog#updateButtonsEnableState(IStatus) */ protected void updateButtonsEnableState(IStatus status) { boolean isOK = !status.matches(IStatus.ERROR); fPages[fCurrentPage].okState = isOK; boolean isAllOK = isOK; for (int i = 0; i != fNumberOfPages; i++) isAllOK = isAllOK && fPages[i].okState; fFinishButton.setEnabled(isAllOK); boolean nextButtonEnabled = isOK && (fCurrentPage < fNumberOfPages - 1); fNextButton.setEnabled(nextButtonEnabled); fBackButton.setEnabled(fCurrentPage != 0); if (nextButtonEnabled) { getShell().setDefaultButton(fNextButton); } else if (isAllOK) { getShell().setDefaultButton(fFinishButton); } } private void turnPage(boolean toNextPage) { Page page = fPages[fCurrentPage]; // store filter String filter = getFilter(); if (filter == null) filter = ""; //$NON-NLS-1$ page.filter = filter; // store selection Object[] selectedElements = getSelectedElements(); List list = getInitialElementSelections(); list.set(fCurrentPage, selectedElements); // store result setResult(fCurrentPage, getSelectedElements()); if (toNextPage) { if (fCurrentPage + 1 >= fNumberOfPages) return; fCurrentPage++; } else { if (fCurrentPage - 1 < 0) return; fCurrentPage--; } if (fPageInfoLabel != null && !fPageInfoLabel.isDisposed()) fPageInfoLabel.setText(getPageInfoMessage()); setPageData(); validateCurrentSelection(); } private void setPageData() { Page page = fPages[fCurrentPage]; // 1. set elements setListElements(page.elements); // 2. apply filter String filter = page.filter; if (filter == null) filter = ""; //$NON-NLS-1$ setFilter(filter); // 3. select elements Object[] selectedElements = (Object[]) getInitialElementSelections().get(fCurrentPage); setSelection(selectedElements); fFilteredList.setFocus(); } private String getPageInfoMessage() { if (fPageInfoMessage == null) return ""; //$NON-NLS-1$ String[] args = new String[] { Integer.toString(fCurrentPage + 1), Integer.toString(fNumberOfPages) }; return MessageFormat.format(fPageInfoMessage, args); } private void initializeResult(int length) { List result = new ArrayList(length); for (int i = 0; i != length; i++) result.add(null); setResult(result); } /** * Gets the current Page. * @return Returns a int */ public int getCurrentPage() { return fCurrentPage; } }