| /******************************************************************************* |
| * Copyright (c) 2010, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| ******************************************************************************/ |
| |
| package org.eclipse.ui.internal.handlers; |
| |
| import java.util.Collections; |
| import java.util.Map; |
| import javax.inject.Named; |
| import org.eclipse.core.commands.Command; |
| import org.eclipse.core.commands.ExecutionEvent; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.core.commands.HandlerEvent; |
| import org.eclipse.core.commands.IHandler; |
| import org.eclipse.core.commands.IHandler2; |
| import org.eclipse.core.commands.IHandlerListener; |
| import org.eclipse.core.commands.NotHandledException; |
| import org.eclipse.core.expressions.IEvaluationContext; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.e4.core.commands.ExpressionContext; |
| import org.eclipse.e4.core.commands.internal.HandlerServiceHandler; |
| import org.eclipse.e4.core.commands.internal.HandlerServiceImpl; |
| import org.eclipse.e4.core.commands.internal.SetEnabled; |
| import org.eclipse.e4.core.contexts.IEclipseContext; |
| import org.eclipse.e4.core.di.annotations.CanExecute; |
| import org.eclipse.e4.core.di.annotations.Execute; |
| import org.eclipse.e4.core.di.annotations.Optional; |
| import org.eclipse.e4.ui.internal.workbench.Activator; |
| import org.eclipse.e4.ui.internal.workbench.Policy; |
| import org.eclipse.e4.ui.model.application.MApplication; |
| import org.eclipse.swt.widgets.Event; |
| import org.eclipse.ui.PlatformUI; |
| import org.eclipse.ui.commands.IElementUpdater; |
| import org.eclipse.ui.internal.Workbench; |
| import org.eclipse.ui.internal.WorkbenchPlugin; |
| import org.eclipse.ui.menus.UIElement; |
| |
| /** |
| * @since 3.5 |
| * |
| */ |
| public class E4HandlerProxy implements IHandler2, IHandlerListener, IElementUpdater { |
| public HandlerActivation activation; |
| private final Command command; |
| private final IHandler handler; |
| private boolean logExecute = true; |
| private boolean logSetEnabled = true; |
| |
| public E4HandlerProxy(Command command, IHandler handler) { |
| this.command = command; |
| this.handler = handler; |
| handler.addHandlerListener(this); |
| } |
| |
| @CanExecute |
| public boolean canExecute(IEclipseContext context, @Optional IEvaluationContext staticContext, |
| MApplication application) { |
| if (handler instanceof IHandler2) { |
| Object ctx = staticContext; |
| if (ctx == null) { |
| if (context != null) { |
| ctx = new ExpressionContext(context != null ? context : application.getContext()); |
| } |
| } |
| ((IHandler2) handler).setEnabled(ctx); |
| } |
| return handler.isEnabled(); |
| } |
| |
| @Execute |
| public Object execute(IEclipseContext context, @Optional @Named(HandlerServiceImpl.PARM_MAP) Map parms, |
| @Optional Event trigger, @Optional IEvaluationContext staticContext) |
| throws ExecutionException, NotHandledException { |
| if (Policy.DEBUG_CMDS) { |
| Activator.trace(Policy.DEBUG_CMDS_FLAG, "execute " + command + " and " //$NON-NLS-1$ //$NON-NLS-2$ |
| + handler + " with: " + context, null); //$NON-NLS-1$ |
| } |
| IEvaluationContext appContext = staticContext; |
| if (appContext == null) { |
| appContext = new ExpressionContext(context); |
| } |
| ExecutionEvent event = new ExecutionEvent(command, parms == null ? Collections.EMPTY_MAP : parms, trigger, |
| appContext); |
| if (handler != null) { |
| if (handler.isHandled()) { |
| return handler.execute(event); |
| } |
| throw new NotHandledException("Handler " + handler //$NON-NLS-1$ |
| + " is not handled for for command " + command); //$NON-NLS-1$ |
| } |
| throw new NotHandledException("There is no handler to execute for command " + command); //$NON-NLS-1$ |
| } |
| |
| public IHandler getHandler() { |
| return handler; |
| } |
| |
| @Override |
| public void handlerChanged(HandlerEvent handlerEvent) { |
| IHandler handler = command.getHandler(); |
| if (handler instanceof HandlerServiceHandler) { |
| IEclipseContext appContext = ((Workbench) PlatformUI.getWorkbench()).getApplication().getContext(); |
| if (HandlerServiceImpl.lookUpHandler(appContext, command.getId()) == this) { |
| ((HandlerServiceHandler) handler).fireHandlerChanged(handlerEvent); |
| } |
| } |
| } |
| |
| @Override |
| public void updateElement(UIElement element, Map parameters) { |
| if (handler instanceof IElementUpdater) { |
| ((IElementUpdater) handler).updateElement(element, parameters); |
| } |
| } |
| |
| @SetEnabled |
| void setEnabled(IEclipseContext context, @Optional IEvaluationContext evalContext) { |
| if (evalContext == null) { |
| evalContext = new ExpressionContext(context); |
| } |
| if (handler instanceof IHandler2) { |
| ((IHandler2) handler).setEnabled(evalContext); |
| } |
| } |
| |
| @Override |
| public void addHandlerListener(IHandlerListener handlerListener) { |
| handler.addHandlerListener(handlerListener); |
| } |
| |
| @Override |
| public void dispose() { |
| handler.dispose(); |
| } |
| |
| @Override |
| public Object execute(ExecutionEvent event) throws ExecutionException { |
| if (logExecute) { |
| logExecute = false; |
| Status status = new Status(IStatus.WARNING, "org.eclipse.ui", //$NON-NLS-1$ |
| "Called handled proxy execute(*) directly" + command, new Exception()); //$NON-NLS-1$ |
| WorkbenchPlugin.log(status); |
| } |
| return null; |
| } |
| |
| @Override |
| public boolean isEnabled() { |
| return handler.isEnabled(); |
| } |
| |
| @Override |
| public boolean isHandled() { |
| return handler.isHandled(); |
| } |
| |
| @Override |
| public void removeHandlerListener(IHandlerListener handlerListener) { |
| handler.removeHandlerListener(handlerListener); |
| } |
| |
| @Override |
| public void setEnabled(Object evaluationContext) { |
| if (logSetEnabled) { |
| logSetEnabled = false; |
| Status status = new Status(IStatus.WARNING, "org.eclipse.ui", //$NON-NLS-1$ |
| "Called handled proxy setEnabled(*) directly" + command, new Exception()); //$NON-NLS-1$ |
| WorkbenchPlugin.log(status); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder builder = new StringBuilder(); |
| builder.append("E4HandlerProxy ["); //$NON-NLS-1$ |
| builder.append("handler="); //$NON-NLS-1$ |
| builder.append(handler); |
| if (command != null) { |
| builder.append(", "); //$NON-NLS-1$ |
| builder.append("command="); //$NON-NLS-1$ |
| builder.append(command); |
| } |
| builder.append("]"); //$NON-NLS-1$ |
| return builder.toString(); |
| } |
| |
| } |