Java tutorial
/******************************************************************************* * Copyright (c) 2007, 2009 Intel 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: * Intel Corporation - initial API and implementation * IBM Corporation *******************************************************************************/ package org.eclipse.cdt.ui.wizards; import java.net.URI; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import org.eclipse.core.filesystem.EFS; import org.eclipse.core.filesystem.IFileInfo; import org.eclipse.core.filesystem.IFileStore; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IConfigurationElement; import org.eclipse.core.runtime.IExtension; import org.eclipse.core.runtime.IExtensionPoint; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Platform; import org.eclipse.core.runtime.Status; import org.eclipse.jface.dialogs.IMessageProvider; import org.eclipse.jface.wizard.IWizard; import org.eclipse.jface.wizard.IWizardPage; import org.eclipse.osgi.util.TextProcessor; import org.eclipse.swt.SWT; import org.eclipse.swt.accessibility.AccessibleAdapter; import org.eclipse.swt.accessibility.AccessibleEvent; 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.Tree; import org.eclipse.swt.widgets.TreeItem; import org.eclipse.ui.dialogs.WizardNewProjectCreationPage; import org.eclipse.cdt.ui.CDTSharedImages; import org.eclipse.cdt.ui.CUIPlugin; import org.eclipse.cdt.ui.newui.CDTPrefUtil; import org.eclipse.cdt.ui.newui.PageLayout; import org.eclipse.cdt.internal.ui.newui.Messages; public class CDTMainWizardPage extends WizardNewProjectCreationPage implements IWizardItemsListListener { public static final String PAGE_ID = "org.eclipse.cdt.managedbuilder.ui.wizard.NewModelProjectWizardPage"; //$NON-NLS-1$ private static final String EXTENSION_POINT_ID = "org.eclipse.cdt.ui.CDTWizard"; //$NON-NLS-1$ private static final String ELEMENT_NAME = "wizard"; //$NON-NLS-1$ private static final String CLASS_NAME = "class"; //$NON-NLS-1$ public static final String DESC = "EntryDescriptor"; //$NON-NLS-1$ // Widgets private Tree tree; private Composite right; private Button showSup; private Label rightLabel; public CWizardHandler h_selected; private Label categorySelectedLabel; /** * Creates a new project creation wizard page. * * @param pageName the name of this page */ public CDTMainWizardPage(String pageName) { super(pageName); setPageComplete(false); } @Override public void createControl(Composite parent) { super.createControl(parent); createDynamicGroup((Composite) getControl()); switchTo(updateData(tree, right, showSup, CDTMainWizardPage.this, getWizard()), getDescriptor(tree)); setPageComplete(validatePage()); setErrorMessage(null); setMessage(null); } private void createDynamicGroup(Composite parent) { Composite c = new Composite(parent, SWT.NONE); c.setLayoutData(new GridData(GridData.FILL_BOTH)); c.setLayout(new GridLayout(2, true)); Label l1 = new Label(c, SWT.NONE); l1.setText(Messages.CMainWizardPage_0); l1.setFont(parent.getFont()); l1.setLayoutData(new GridData(GridData.BEGINNING)); rightLabel = new Label(c, SWT.NONE); rightLabel.setFont(parent.getFont()); rightLabel.setLayoutData(new GridData(GridData.BEGINNING)); tree = new Tree(c, SWT.SINGLE | SWT.BORDER); tree.setLayoutData(new GridData(GridData.FILL_BOTH)); tree.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { TreeItem[] tis = tree.getSelection(); if (tis == null || tis.length == 0) return; switchTo((CWizardHandler) tis[0].getData(), (EntryDescriptor) tis[0].getData(DESC)); setPageComplete(validatePage()); } }); tree.getAccessible().addAccessibleListener(new AccessibleAdapter() { @Override public void getName(AccessibleEvent e) { for (int i = 0; i < tree.getItemCount(); i++) { if (tree.getItem(i).getText().equals(e.result)) return; } e.result = Messages.CMainWizardPage_0; } }); right = new Composite(c, SWT.NONE); right.setLayoutData(new GridData(GridData.FILL_BOTH)); right.setLayout(new PageLayout()); showSup = new Button(c, SWT.CHECK); showSup.setText(Messages.CMainWizardPage_1); GridData gd = new GridData(GridData.FILL_HORIZONTAL); gd.horizontalSpan = 2; showSup.setLayoutData(gd); showSup.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { if (h_selected != null) h_selected.setSupportedOnly(showSup.getSelection()); switchTo(updateData(tree, right, showSup, CDTMainWizardPage.this, getWizard()), getDescriptor(tree)); } }); // restore settings from preferences showSup.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOSUPP)); } @Override public IWizardPage getNextPage() { return (h_selected == null) ? null : h_selected.getSpecificPage(); } public URI getProjectLocation() { return useDefaults() ? null : getLocationURI(); } /** * Returns whether this page's controls currently all contain valid * values. * * @return <code>true</code> if all controls are valid, and * <code>false</code> if at least one is invalid */ @Override protected boolean validatePage() { setMessage(null); if (!super.validatePage()) return false; if (getProjectName().indexOf('#') >= 0) { setErrorMessage(Messages.CDTMainWizardPage_0); return false; } boolean bad = true; // should we treat existing project as error IProject handle = getProjectHandle(); if (handle.exists()) { if (getWizard() instanceof IWizardWithMemory) { IWizardWithMemory w = (IWizardWithMemory) getWizard(); if (w.getLastProjectName() != null && w.getLastProjectName().equals(getProjectName())) bad = false; } if (bad) { setErrorMessage(Messages.CMainWizardPage_10); return false; } } if (bad) { // Skip this check if project already created try { IFileStore fs; URI p = getProjectLocation(); if (p == null) { fs = EFS.getStore(ResourcesPlugin.getWorkspace().getRoot().getLocationURI()); fs = fs.getChild(getProjectName()); } else fs = EFS.getStore(p); IFileInfo f = fs.fetchInfo(); if (f.exists()) { if (f.isDirectory()) { if (f.getAttribute(EFS.ATTRIBUTE_READ_ONLY)) { setErrorMessage(Messages.CMainWizardPage_DirReadOnlyError); return false; } else setMessage(Messages.CMainWizardPage_7, IMessageProvider.WARNING); } else { setErrorMessage(Messages.CMainWizardPage_6); return false; } } } catch (CoreException e) { CUIPlugin.log(e.getStatus()); } } if (!useDefaults()) { IStatus locationStatus = ResourcesPlugin.getWorkspace().validateProjectLocationURI(handle, getLocationURI()); if (!locationStatus.isOK()) { setErrorMessage(locationStatus.getMessage()); return false; } } if (tree.getItemCount() == 0) { setErrorMessage(Messages.CMainWizardPage_3); return false; } // it is not an error, but we cannot continue if (h_selected == null) { setErrorMessage(null); return false; } String s = h_selected.getErrorMessage(); if (s != null) { setErrorMessage(s); return false; } setErrorMessage(null); return true; } /** * * @param tree * @param right * @param show_sup * @param ls * @param wizard * @return : selected Wizard Handler. */ public static CWizardHandler updateData(Tree tree, Composite right, Button show_sup, IWizardItemsListListener ls, IWizard wizard) { // Remember selected item TreeItem[] selection = tree.getSelection(); TreeItem selectedItem = selection.length > 0 ? selection[0] : null; String savedLabel = selectedItem != null ? selectedItem.getText() : null; String savedParentLabel = getParentText(selectedItem); tree.removeAll(); IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(EXTENSION_POINT_ID); if (extensionPoint == null) return null; IExtension[] extensions = extensionPoint.getExtensions(); if (extensions == null) return null; List<EntryDescriptor> items = new ArrayList<EntryDescriptor>(); for (int i = 0; i < extensions.length; ++i) { IConfigurationElement[] elements = extensions[i].getConfigurationElements(); for (IConfigurationElement element : elements) { if (element.getName().equals(ELEMENT_NAME)) { CNewWizard w = null; try { w = (CNewWizard) element.createExecutableExtension(CLASS_NAME); } catch (CoreException e) { System.out.println(Messages.CMainWizardPage_5 + e.getLocalizedMessage()); return null; } if (w == null) return null; w.setDependentControl(right, ls); for (EntryDescriptor ed : w.createItems(show_sup.getSelection(), wizard)) items.add(ed); } } } // If there is a EntryDescriptor which is default for category, make sure it // is in the front of the list. for (int i = 0; i < items.size(); ++i) { EntryDescriptor ed = items.get(i); if (ed.isDefaultForCategory()) { items.remove(i); items.add(0, ed); break; } } // bug # 211935 : allow items filtering. if (ls != null) // NULL means call from prefs items = ls.filterItems(items); addItemsToTree(tree, items); if (tree.getItemCount() > 0) { TreeItem target = null; // Try to search item which was selected before if (savedLabel != null) { target = findItem(tree, savedLabel, savedParentLabel); } if (target == null) { // Default selection associated with "org.eclipse.cdt.build.core.buildArtefactType.exe" project type target = findItem(tree, Messages.CDTMainWizardPage_DefaultProjectType, Messages.CDTMainWizardPage_DefaultProjectCategory); if (target == null) { CUIPlugin.log(new Status(IStatus.WARNING, CUIPlugin.PLUGIN_ID, "Default project not found in New C/C++ Project Wizard")); //$NON-NLS-1$ } } if (target == null) { target = tree.getItem(0); if (target.getItemCount() != 0) target = target.getItem(0); } tree.setSelection(target); return (CWizardHandler) target.getData(); } return null; } private static String getParentText(TreeItem item) { if (item == null || item.getParentItem() == null) return ""; //$NON-NLS-1$ return item.getParentItem().getText(); } private static TreeItem findItem(Tree tree, String label, String parentLabel) { for (TreeItem item : tree.getItems()) { TreeItem foundItem = findTreeItem(item, label, parentLabel); if (foundItem != null) return foundItem; } return null; } private static TreeItem findTreeItem(TreeItem item, String label, String parentLabel) { if (item.getText().equals(label) && getParentText(item).equals(parentLabel)) return item; for (TreeItem child : item.getItems()) { TreeItem foundItem = findTreeItem(child, label, parentLabel); if (foundItem != null) return foundItem; } return null; } private static void addItemsToTree(Tree tree, List<EntryDescriptor> items) { // Sorting is disabled because of users requests // Collections.sort(items, CDTListComparator.getInstance()); ArrayList<TreeItem> placedTreeItemsList = new ArrayList<TreeItem>(items.size()); ArrayList<EntryDescriptor> placedEntryDescriptorsList = new ArrayList<EntryDescriptor>(items.size()); for (EntryDescriptor wd : items) { if (wd.getParentId() == null) { wd.setPath(wd.getId()); TreeItem ti = new TreeItem(tree, SWT.NONE); ti.setText(TextProcessor.process(wd.getName())); ti.setData(wd.getHandler()); ti.setData(DESC, wd); ti.setImage(calcImage(wd)); placedTreeItemsList.add(ti); placedEntryDescriptorsList.add(wd); } } while (true) { boolean found = false; Iterator<EntryDescriptor> it2 = items.iterator(); while (it2.hasNext()) { EntryDescriptor wd1 = it2.next(); if (wd1.getParentId() == null) continue; for (int i = 0; i < placedEntryDescriptorsList.size(); i++) { EntryDescriptor wd2 = placedEntryDescriptorsList.get(i); if (wd2.getId().equals(wd1.getParentId())) { found = true; wd1.setParentId(null); CWizardHandler h = wd2.getHandler(); /* If neither wd1 itself, nor its parent (wd2) have a handler * associated with them, and the item is not a category, * then skip it. If it's category, then it's possible that * children will have a handler associated with them. */ if (h == null && wd1.getHandler() == null && !wd1.isCategory()) break; wd1.setPath(wd2.getPath() + "/" + wd1.getId()); //$NON-NLS-1$ wd1.setParent(wd2); if (h != null) { if (wd1.getHandler() == null && !wd1.isCategory()) wd1.setHandler((CWizardHandler) h.clone()); if (!h.isApplicable(wd1)) break; } TreeItem p = placedTreeItemsList.get(i); TreeItem ti = new TreeItem(p, SWT.NONE); ti.setText(wd1.getName()); ti.setData(wd1.getHandler()); ti.setData(DESC, wd1); ti.setImage(calcImage(wd1)); placedTreeItemsList.add(ti); placedEntryDescriptorsList.add(wd1); break; } } } // repeat iterations until all items are placed. if (!found) break; } // orphan elements (with not-existing parentId) are ignored } private void switchTo(CWizardHandler h, EntryDescriptor ed) { if (h == null) h = ed.getHandler(); if (ed.isCategory()) h = null; try { if (h != null) h.initialize(ed); } catch (CoreException e) { h = null; } if (h_selected != null) h_selected.handleUnSelection(); h_selected = h; if (h == null) { if (ed.isCategory()) { if (categorySelectedLabel == null) { categorySelectedLabel = new Label(right, SWT.WRAP); categorySelectedLabel.setText(Messages.CDTMainWizardPage_1); right.layout(); } categorySelectedLabel.setVisible(true); } return; } rightLabel.setText(h_selected.getHeader()); if (categorySelectedLabel != null) categorySelectedLabel.setVisible(false); h_selected.handleSelection(); h_selected.setSupportedOnly(showSup.getSelection()); } public static EntryDescriptor getDescriptor(Tree tree) { TreeItem[] sel = tree.getSelection(); if (sel == null || sel.length == 0) return null; return (EntryDescriptor) sel[0].getData(DESC); } @Override public void toolChainListChanged(int count) { setPageComplete(validatePage()); getWizard().getContainer().updateButtons(); } @Override public boolean isCurrent() { return isCurrentPage(); } private static Image calcImage(EntryDescriptor ed) { Image image = ed.getImage(); if (image != null) return image; if (ed.isCategory()) return CDTSharedImages.getImage(CDTSharedImages.IMG_OBJS_SEARCHFOLDER); return CDTSharedImages.getImage(CDTSharedImages.IMG_OBJS_VARIABLE); } @Override @SuppressWarnings({ "unchecked", "rawtypes" }) public List filterItems(List items) { return items; } }