Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2011 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 ext.org.eclipse.jdt.internal.ui.wizards.buildpaths; import java.io.File; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.CLabel; 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.Shell; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Path; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.dialogs.StatusDialog; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.jface.window.Window; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.dialogs.PreferencesUtil; import org.eclipse.jdt.core.JavaCore; import patch.org.eclipse.jdt.internal.ui.JavaPlugin; import ext.org.eclipse.jdt.internal.corext.util.Messages; import ext.org.eclipse.jdt.internal.ui.IJavaHelpContextIds; import ext.org.eclipse.jdt.internal.ui.dialogs.StatusInfo; import ext.org.eclipse.jdt.internal.ui.preferences.ClasspathVariablesPreferencePage; import ext.org.eclipse.jdt.internal.ui.wizards.NewWizardMessages; import ext.org.eclipse.jdt.internal.ui.wizards.dialogfields.DialogField; import ext.org.eclipse.jdt.internal.ui.wizards.dialogfields.IDialogFieldListener; import ext.org.eclipse.jdt.internal.ui.wizards.dialogfields.IListAdapter; import ext.org.eclipse.jdt.internal.ui.wizards.dialogfields.LayoutUtil; import ext.org.eclipse.jdt.internal.ui.wizards.dialogfields.ListDialogField; import ext.org.eclipse.jdt.internal.ui.wizards.dialogfields.SelectionButtonDialogField; public class NewVariableEntryDialog extends StatusDialog { private class VariablesAdapter implements IDialogFieldListener, IListAdapter<CPVariableElement> { // -------- IListAdapter -------- public void customButtonPressed(ListDialogField<CPVariableElement> field, int index) { switch (index) { case IDX_EXTEND: /* extend */ extendButtonPressed(); break; } } public void selectionChanged(ListDialogField<CPVariableElement> field) { doSelectionChanged(); } public void doubleClicked(ListDialogField<CPVariableElement> field) { doDoubleClick(); } // ---------- IDialogFieldListener -------- public void dialogFieldChanged(DialogField field) { if (field == fConfigButton) { configButtonPressed(); } } } private final int IDX_EXTEND = 0; private ListDialogField<CPVariableElement> fVariablesList; private boolean fCanExtend; private boolean fIsValidSelection; private IPath[] fResultPaths; private SelectionButtonDialogField fConfigButton; private CLabel fWarning; public NewVariableEntryDialog(Shell parent) { super(parent); setTitle(NewWizardMessages.NewVariableEntryDialog_title); updateStatus(new StatusInfo(IStatus.ERROR, "")); //$NON-NLS-1$ String[] buttonLabels = new String[] { NewWizardMessages.NewVariableEntryDialog_vars_extend, }; VariablesAdapter adapter = new VariablesAdapter(); CPVariableElementLabelProvider labelProvider = new CPVariableElementLabelProvider(false); fVariablesList = new ListDialogField<CPVariableElement>(adapter, buttonLabels, labelProvider); fVariablesList.setDialogFieldListener(adapter); fVariablesList.setLabelText(NewWizardMessages.NewVariableEntryDialog_vars_label); fVariablesList.enableButton(IDX_EXTEND, false); fVariablesList.setViewerComparator(new ViewerComparator() { @Override public int compare(Viewer viewer, Object e1, Object e2) { if (e1 instanceof CPVariableElement && e2 instanceof CPVariableElement) { return getComparator().compare(((CPVariableElement) e1).getName(), ((CPVariableElement) e2).getName()); } return super.compare(viewer, e1, e2); } }); fConfigButton = new SelectionButtonDialogField(SWT.PUSH); fConfigButton.setLabelText(NewWizardMessages.NewVariableEntryDialog_configbutton_label); fConfigButton.setDialogFieldListener(adapter); initializeElements(); fCanExtend = false; fIsValidSelection = false; fResultPaths = null; fVariablesList.selectFirstElement(); } /* * @see org.eclipse.jface.dialogs.Dialog#isResizable() * @since 3.4 */ @Override protected boolean isResizable() { return true; } private void initializeElements() { String[] entries = JavaCore.getClasspathVariableNames(); ArrayList<CPVariableElement> elements = new ArrayList<CPVariableElement>(entries.length); for (int i = 0; i < entries.length; i++) { String name = entries[i]; IPath entryPath = JavaCore.getClasspathVariable(name); if (entryPath != null) { elements.add(new CPVariableElement(name, entryPath)); } } fVariablesList.setElements(elements); } /* (non-Javadoc) * @see Window#configureShell(Shell) */ @Override protected void configureShell(Shell shell) { super.configureShell(shell); PlatformUI.getWorkbench().getHelpSystem().setHelp(shell, IJavaHelpContextIds.NEW_VARIABLE_ENTRY_DIALOG); } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#getDialogBoundsSettings() */ @Override protected IDialogSettings getDialogBoundsSettings() { return JavaPlugin.getDefault().getDialogSettingsSection(getClass().getName()); } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite) */ @Override protected Control createDialogArea(Composite parent) { initializeDialogUnits(parent); Composite composite = (Composite) super.createDialogArea(parent); GridLayout layout = (GridLayout) composite.getLayout(); layout.numColumns = 2; fVariablesList.doFillIntoGrid(composite, 3); LayoutUtil.setHorizontalSpan(fVariablesList.getLabelControl(null), 2); GridData listData = (GridData) fVariablesList.getListControl(null).getLayoutData(); listData.grabExcessHorizontalSpace = true; listData.heightHint = convertHeightInCharsToPixels(10); listData.widthHint = convertWidthInCharsToPixels(70); fWarning = new CLabel(composite, SWT.NONE); fWarning.setLayoutData( new GridData(SWT.FILL, SWT.TOP, true, false, fVariablesList.getNumberOfControls() - 1, 1)); Composite lowerComposite = new Composite(composite, SWT.NONE); lowerComposite.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL)); layout = new GridLayout(); layout.marginHeight = 0; layout.marginWidth = 0; lowerComposite.setLayout(layout); fConfigButton.doFillIntoGrid(lowerComposite, 1); applyDialogFont(composite); return composite; } public IPath[] getResult() { return fResultPaths; } /* * @see IDoubleClickListener#doubleClick(DoubleClickEvent) */ private void doDoubleClick() { if (fIsValidSelection) { okPressed(); } else if (fCanExtend) { extendButtonPressed(); } } private void doSelectionChanged() { boolean isValidSelection = true; boolean canExtend = false; StatusInfo status = new StatusInfo(); List<CPVariableElement> selected = fVariablesList.getSelectedElements(); int nSelected = selected.size(); if (nSelected > 0) { fResultPaths = new Path[nSelected]; for (int i = 0; i < nSelected; i++) { CPVariableElement curr = selected.get(i); fResultPaths[i] = new Path(curr.getName()); File file = curr.getPath().toFile(); if (!file.exists()) { status.setError(NewWizardMessages.NewVariableEntryDialog_info_notexists); isValidSelection = false; break; } if (file.isDirectory()) { canExtend = true; } } } else { isValidSelection = false; status.setInfo(NewWizardMessages.NewVariableEntryDialog_info_noselection); } if (isValidSelection && nSelected > 1) { String str = Messages.format(NewWizardMessages.NewVariableEntryDialog_info_selected, String.valueOf(nSelected)); status.setInfo(str); } fCanExtend = nSelected == 1 && canExtend; fVariablesList.enableButton(0, fCanExtend); updateStatus(status); fIsValidSelection = isValidSelection; Button okButton = getButton(IDialogConstants.OK_ID); if (okButton != null && !okButton.isDisposed()) { okButton.setEnabled(isValidSelection); } updateDeprecationWarning(); } private void updateDeprecationWarning() { if (fWarning == null || fWarning.isDisposed()) return; for (Iterator<CPVariableElement> iter = fVariablesList.getSelectedElements().iterator(); iter.hasNext();) { CPVariableElement element = iter.next(); String deprecationMessage = element.getDeprecationMessage(); if (deprecationMessage != null) { fWarning.setText(deprecationMessage); fWarning.setImage(JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_WARNING)); return; } } fWarning.setText(null); fWarning.setImage(null); } private IPath[] chooseExtensions(CPVariableElement elem) { File file = elem.getPath().toFile(); JARFileSelectionDialog dialog = new JARFileSelectionDialog(getShell(), true, true, true); dialog.setTitle(NewWizardMessages.NewVariableEntryDialog_ExtensionDialog_title); dialog.setMessage(Messages.format(NewWizardMessages.NewVariableEntryDialog_ExtensionDialog_description, elem.getName())); dialog.setInput(file); if (dialog.open() == Window.OK) { Object[] selected = dialog.getResult(); IPath[] paths = new IPath[selected.length]; for (int i = 0; i < selected.length; i++) { IPath filePath = Path.fromOSString(((File) selected[i]).getPath()); IPath resPath = new Path(elem.getName()); for (int k = elem.getPath().segmentCount(); k < filePath.segmentCount(); k++) { resPath = resPath.append(filePath.segment(k)); } paths[i] = resPath; } return paths; } return null; } protected final void extendButtonPressed() { List<CPVariableElement> selected = fVariablesList.getSelectedElements(); if (selected.size() == 1) { IPath[] extendedPaths = chooseExtensions(selected.get(0)); if (extendedPaths != null) { fResultPaths = extendedPaths; super.buttonPressed(IDialogConstants.OK_ID); } } } protected final void configButtonPressed() { String id = ClasspathVariablesPreferencePage.ID; Map<String, String> options = new HashMap<String, String>(); List<CPVariableElement> selected = fVariablesList.getSelectedElements(); if (!selected.isEmpty()) { String varName = selected.get(0).getName(); options.put(ClasspathVariablesPreferencePage.DATA_SELECT_VARIABLE, varName); } PreferencesUtil.createPreferenceDialogOn(getShell(), id, new String[] { id }, options).open(); List<CPVariableElement> oldElements = fVariablesList.getElements(); initializeElements(); List<CPVariableElement> newElements = fVariablesList.getElements(); newElements.removeAll(oldElements); if (!newElements.isEmpty()) { fVariablesList.selectElements(new StructuredSelection(newElements)); } else if (fVariablesList.getSelectedElements().isEmpty()) { fVariablesList.selectFirstElement(); } } }