| /******************************************************************************* |
| * Copyright (c) 2005, 2006 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.ui.examples.undo; |
| |
| import org.eclipse.core.commands.operations.IOperationApprover; |
| import org.eclipse.core.commands.operations.IOperationHistory; |
| import org.eclipse.core.commands.operations.IUndoContext; |
| import org.eclipse.core.commands.operations.IUndoableOperation; |
| import org.eclipse.core.runtime.IAdaptable; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.jface.dialogs.MessageDialogWithToggle; |
| import org.eclipse.jface.window.Window; |
| import org.eclipse.osgi.util.NLS; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.ui.examples.undo.preferences.PreferenceConstants; |
| |
| /** |
| * An operation approver that prompts the user to see whether an undo or redo |
| * should continue. An example preference is checked to determine if prompting |
| * should occur. |
| */ |
| public final class PromptingUserApprover implements IOperationApprover { |
| |
| private IUndoContext context; |
| |
| /* |
| * Create the operation approver. |
| */ |
| public PromptingUserApprover(IUndoContext context) { |
| super(); |
| this.context = context; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.commands.operations.IOperationApprover#proceedRedoing(org.eclipse.core.commands.operations.IUndoableOperation, |
| * org.eclipse.core.commands.operations.IOperationHistory, |
| * org.eclipse.core.runtime.IAdaptable) |
| */ |
| public IStatus proceedRedoing(IUndoableOperation operation, |
| IOperationHistory history, IAdaptable uiInfo) { |
| |
| // return immediately if the operation is not relevant |
| if (!operation.hasContext(context)) |
| return Status.OK_STATUS; |
| |
| // allow the operation if we are not prompting |
| boolean prompt = UndoPlugin.getDefault().getPreferenceStore() |
| .getBoolean(PreferenceConstants.PREF_CONFIRMUNDO); |
| if (!prompt) |
| return Status.OK_STATUS; |
| return prompt(false, operation, uiInfo); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.commands.operations.IOperationApprover#proceedUndoing(org.eclipse.core.commands.operations.IUndoableOperation, |
| * org.eclipse.core.commands.operations.IOperationHistory, |
| * org.eclipse.core.runtime.IAdaptable) |
| */ |
| public IStatus proceedUndoing(IUndoableOperation operation, |
| IOperationHistory history, IAdaptable uiInfo) { |
| |
| // return immediately if the operation is not relevant |
| if (!operation.hasContext(context)) |
| return Status.OK_STATUS; |
| |
| // allow the operation if we are not prompting |
| boolean prompt = UndoPlugin.getDefault().getPreferenceStore() |
| .getBoolean(PreferenceConstants.PREF_CONFIRMUNDO); |
| if (!prompt) |
| return Status.OK_STATUS; |
| return prompt(true, operation, uiInfo); |
| } |
| |
| /* |
| * Prompt the user as to whether to continue the undo or redo, and return an |
| * OK_STATUS if we should continue, or a CANCEL_STATUS if we should not. |
| */ |
| private IStatus prompt(boolean undoing, IUndoableOperation operation, |
| IAdaptable uiInfo) { |
| boolean createdShell = false; |
| Shell shell = getShell(uiInfo); |
| if (shell == null) { |
| if (shell == null) { |
| createdShell = true; |
| shell = new Shell(); |
| } |
| } |
| String command = undoing ? UndoExampleMessages.BoxView_Undo |
| : UndoExampleMessages.BoxView_Redo; |
| String message = NLS.bind(UndoExampleMessages.BoxView_ConfirmUndo, command, |
| operation.getLabel()); |
| MessageDialogWithToggle dialog = MessageDialogWithToggle |
| .openOkCancelConfirm(shell, UndoExampleMessages.BoxView_Title, |
| message, UndoExampleMessages.UndoPreferences_DoNotConfirm, false, null, null); |
| UndoPlugin.getDefault().getPreferenceStore().setValue(PreferenceConstants.PREF_CONFIRMUNDO, !dialog.getToggleState()); |
| |
| if (createdShell) |
| shell.dispose(); |
| if (dialog.getReturnCode() == Window.OK) |
| return Status.OK_STATUS; |
| return Status.CANCEL_STATUS; |
| } |
| |
| /* |
| * Return the shell described by the supplied uiInfo, or null if no shell is |
| * described. |
| */ |
| Shell getShell(IAdaptable uiInfo) { |
| if (uiInfo != null) { |
| Shell shell = (Shell) uiInfo.getAdapter(Shell.class); |
| if (shell != null) |
| return shell; |
| } |
| return null; |
| } |
| } |