Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2008 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.wst.jsdt.ui.actions; import org.eclipse.core.resources.IWorkspaceRoot; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.CoreException; import org.eclipse.jface.action.Action; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.window.Window; import org.eclipse.jface.wizard.WizardDialog; import org.eclipse.swt.widgets.Shell; import org.eclipse.ui.INewWizard; import org.eclipse.ui.IWorkbenchWindow; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.actions.NewProjectAction; import org.eclipse.wst.jsdt.core.IJavaScriptElement; import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin; import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler; import org.eclipse.wst.jsdt.internal.ui.util.PixelConverter; import org.eclipse.wst.jsdt.internal.ui.wizards.NewElementWizard; import org.eclipse.wst.jsdt.internal.ui.wizards.NewWizardMessages; /** * <p>Abstract base classed used for the open wizard actions.</p> * * <p> * Note: This class is for internal use only. Clients should not use this class. * </p> * Provisional API: This class/interface is part of an interim API that is still under development and expected to * change significantly before reaching stability. It is being made available at this early stage to solicit feedback * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken * (repeatedly) as the API evolves. */ public abstract class AbstractOpenWizardAction extends Action { private Shell fShell; private IStructuredSelection fSelection; private IJavaScriptElement fCreatedElement; /** * Creates the action. */ protected AbstractOpenWizardAction() { fShell = null; fSelection = null; fCreatedElement = null; } /* (non-Javadoc) * @see org.eclipse.jface.action.Action#run() */ public void run() { Shell shell = getShell(); if (!doCreateProjectFirstOnEmptyWorkspace(shell)) { return; } try { INewWizard wizard = createWizard(); wizard.init(PlatformUI.getWorkbench(), getSelection()); WizardDialog dialog = new WizardDialog(shell, wizard); PixelConverter converter = new PixelConverter(JFaceResources.getDialogFont()); dialog.setMinimumPageSize(converter.convertWidthInCharsToPixels(70), converter.convertHeightInCharsToPixels(20)); dialog.create(); int res = dialog.open(); if (res == Window.OK && wizard instanceof NewElementWizard) { fCreatedElement = ((NewElementWizard) wizard).getCreatedElement(); } notifyResult(res == Window.OK); } catch (CoreException e) { String title = NewWizardMessages.AbstractOpenWizardAction_createerror_title; String message = NewWizardMessages.AbstractOpenWizardAction_createerror_message; ExceptionHandler.handle(e, shell, title, message); } } /** * Creates and configures the wizard. This method should only be called once. * @return returns the created wizard. * @throws CoreException exception is thrown when the creation was not successful. */ abstract protected INewWizard createWizard() throws CoreException; /** * Returns the configured selection. If no selection has been configured using {@link #setSelection(IStructuredSelection)}, * the currently selected element of the active workbench is returned. * @return the configured selection */ protected IStructuredSelection getSelection() { if (fSelection == null) { return evaluateCurrentSelection(); } return fSelection; } private IStructuredSelection evaluateCurrentSelection() { IWorkbenchWindow window = JavaScriptPlugin.getActiveWorkbenchWindow(); if (window != null) { ISelection selection = window.getSelectionService().getSelection(); if (selection instanceof IStructuredSelection) { return (IStructuredSelection) selection; } } return StructuredSelection.EMPTY; } /** * Configures the selection to be used as initial selection of the wizard. * @param selection the selection to be set or <code>null</code> to use the selection of the active workbench window */ public void setSelection(IStructuredSelection selection) { fSelection = selection; } /** * Returns the configured shell. If no shell has been configured using {@link #setShell(Shell)}, * the shell of the currently active workbench is returned. * @return the configured shell */ protected Shell getShell() { if (fShell == null) { return JavaScriptPlugin.getActiveWorkbenchShell(); } return fShell; } /** * Configures the shell to be used as parent shell by the wizard. * @param shell the shell to be set or <code>null</code> to use the shell of the active workbench window */ public void setShell(Shell shell) { fShell = shell; } /** * Opens the new project dialog if the workspace is empty. This method is called on {@link #run()}. * @param shell the shell to use * @return returns <code>true</code> when a project has been created, or <code>false</code> when the * new project has been canceled. */ protected boolean doCreateProjectFirstOnEmptyWorkspace(Shell shell) { IWorkspaceRoot workspaceRoot = ResourcesPlugin.getWorkspace().getRoot(); if (workspaceRoot.getProjects().length == 0) { String title = NewWizardMessages.AbstractOpenWizardAction_noproject_title; String message = NewWizardMessages.AbstractOpenWizardAction_noproject_message; if (MessageDialog.openQuestion(shell, title, message)) { new NewProjectAction().run(); return workspaceRoot.getProjects().length != 0; } return false; } return true; } /** * Returns the created element or <code>null</code> if the wizard has not run or was canceled. * @return the created element or <code>null</code> */ public IJavaScriptElement getCreatedElement() { return fCreatedElement; } }